niScope Properties

NI High-Speed Digitizers Help (NI-SCOPE 16.1)

Edition Date: January 2017

Part Number: 370592AB-01

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NI-SCOPE 18.7 (English | Japanese)

January 2017, 372311L-01

Use the NI-SCOPE properties to access advanced configuration options for high-speed digitizer applications.

Property Description
Active Channel

Specifies the channel name used to access all subsequent properties in this instance of the property node. If the property you want to use is Channel Based, you need to first select this property and then pass the name of the specific channel. If the property you specify is not channel based, pass an empty string, or omit setting this property. The default value is " ". Details

Vertical:Channel Enabled

Specifies whether the digitizer acquires a waveform for the channel. Details

Vertical:Vertical Range

Specifies the absolute value of the input range for a channel. The units are volts. For example, to acquire a sine wave that spans between -5 and +5 V, set this property to 10.0 V. Details

Vertical:Vertical Offset

Specifies the location of the center of the range. The value is with respect to ground and is in volts. For example, to acquire a sine wave that spans between 0.0 and 10.0 V, set this property to 5.0 V. This property is not supported by all digitizers. Details

Vertical:Maximum Input Frequency

Specifies the bandwidth of the channel in hertz. Express this value as the frequency at which the input circuitry attenuates the input signal by 3 dB. Details

Vertical:Vertical Coupling

Specifies how the digitizer couples the input signal for the channel. When you change input coupling, the input stage takes a finite amount of time to settle. Details

Vertical:Input Impedance

Specifies the input impedance for the channel in ohms. Details

Vertical:Probe Attenuation

Specifies the probe attenuation for the input channel. For example, for a 10:1 probe, you would set this property to 10.0. Details

Vertical:Channel Terminal Configuration

Specifies how the digitizer configures the channel terminal. Details

Vertical:Advanced:Digital Gain

Applies gain to the specified channel in hardware before any onboard signal processing occurs. The default value is 1.

The output of the digital gain/offset block is as follows:

(ADC value × digital gain) + digital offset

Units: Unitless

Valid Values: -1.5 to 1.5 Details

Vertical:Advanced:Digital Offset

Applies offset to the specified channel in hardware before any onboard signal processing occurs. The default value is 0.

Units: Volts

Valid Values

±(Vertical Range × 0.4) Details

Vertical:Advanced:Bandpass Filter Enabled

Enables the bandpass filter on the specified channel. For the NI PXIe-5622, set the value to TRUE to enable the IF filtered path 50MHz bandpass filter centered at 187MHz. The default value is FALSE. Details

Vertical:Advanced:Dither Enabled

Enables or disables the analog dither on the device. Using dither can improve the spectral performance of the device by reducing the effects of quantization. However, adding dither increases the power level to the ADC, so you may need to either decrease the signal level or increase the vertical range. The default value is FALSE. Details

Vertical:Advanced:Flex FIR Antialias Filter Type

The NI 5922 flexible-resolution digitizer uses an onboard FIR lowpass antialias filter. Use this property to select from several types of filters to achieve desired filtering characteristics. For most applications, the default value of this property is recommended. The other available filters are useful for optimizing settling time measurements of step responses. The default value is 48 Tap Standard. Details

Vertical:Advanced:High Pass Filter Frequency

Specifies the frequency for the highpass filter in Hz. The device uses one of the valid values listed below. If an invalid value is specified, no coercion occurs. The default value is 0.

(PXIe-5164) Valid Values:

  • 0
  • 90
  • 450
Vertical:Advanced:Interleaving Offset Correction Enabled

Enables the interleaving offset correction on the specified channel. The default value is TRUE. Details

Horizontal:Min Sample Rate

Specifies the sampling rate (in Samples/second) for the acquisition. This attribute is invalid when the device is configured to use an external sample clock timebase. When a DDC is enabled, this attribute specifices the IQ rate. When both the Time Per Record Property and the Min Sample Rate Property are set, the attribute that was set first is ignored. Details

Horizontal:Min Number of Points

Specifies the minimum number of points you require in the waveform record for each channel. Details

Horizontal:Number of Records

Specify the number of records to acquire. Details

Horizontal:Reference Position

Specifies the position of the Reference Event in the waveform record as a percentage of the record. Details

Horizontal:Actual Sample Rate

Returns the actual sample rate used for the acquisition.

Units: hertz (Samples / Second) Details

Horizontal:Actual Record Length

Returns the actual number of points the digitizer acquires for each channel. The value is equal to or greater than the value you specify in the niScope Configure Horizontal Timing VI.

Valid Values: 1 to the maximum memory size Details

Horizontal:Enable Time Interleaved Sampling

Extends the maximum sample rate on the specified Active Channel for some devices that support Time Interleaved Sampling (TIS). TIS enables the device to use multiple ADCs to sample the same waveform at a higher effective real-time rate. NI 5152/5153/5154 devices fully support Read/Write ability for this property. For other devices that use TIS mode, such as the NI 5185/5186, this property is Read Only. Details

Horizontal:Enforce Realtime

Indicates whether the digitizer enforces real-time measurements or allows equivalent-time measurements. Details

Horizontal:Enable Records > Memory

Allows you to acquire more records than fit in onboard memory.

TRUE—Enables NI-SCOPE to fetch more records than fit in memory

FALSE—Disables NI-SCOPE from fetching more records than fit in memory Details

Horizontal:RIS Num Avg

Specifies the number of averages in each RIS bin. Details

Horizontal:RIS Method

Specifies the algorithm for random-interleaved sampling, which is used if the sample rate exceeds the Max Realtime Sample Rate. Details

Horizontal:Maximum Real Time Sample Rate

Returns the maximum real-time sample rate in hertz. Details

Horizontal:Maximum RIS Rate

Returns the maximum RIS sampling rate in hertz. Details

Horizontal:Memory Size

Returns the total combined amount of onboard memory for all channels in bytes. Details

Horizontal:Advanced:Enable TDC

Specifies that the digitizer should record the trigger position precisely using time-digital conversion (TDC). Details

Horizontal:Advanced:Time Per Record

Specifies the length of time (in seconds) that corresponds to the record length. This attribute is invalid when the device is configured to use an external sample clock timebase. This attribute is also invalid when a DDC is enabled. When both the Time Per Record Property and the Min Sample Rate Property are set, the attribute that was set first is ignored. Details

Horizontal:Advanced:Acquisition Start Time

Specifies the length of time (in seconds) from the trigger event to the first point in the waveform record. Details

Horizontal:Advanced:5102 Adjust Pretrigger Samples

When set to TRUE and the digitizer is set to master, the number of pretrigger samples and total number of samples are adjusted to enable synchronizing a master and slave NI 5102. Details

Triggering:Trigger Type

Specifies the type of trigger to use. Details

Triggering:Trigger Source

Specifies the source the digitizer monitors for the trigger event. The value must be selected from one of the following valid values. Details

Triggering:Trigger Output Terminal

Specifies the destination to export the Reference (Stop) Trigger Refer to the device specifications document for a list of valid destinations. Details

Triggering:Trigger Level

Specifies the voltage threshold for the trigger. The units are volts. Details

Triggering:Trigger Modifier

Configures the device to automatically complete an acquisition if a trigger has not been received. Details

Triggering:Auto Triggered

Specifies whether the acquisition was triggered automatically. Auto triggering occurs if the Trigger Modifier property is set to Auto Trigger and no trigger has been received for a certain amount of time. Details

Triggering:Trigger Hysteresis

Specifies the size of the hysteresis window on either side of the trigger level. Details

Triggering:Trigger Delay

Specifies the trigger delay time in seconds. Details

Triggering:Trigger Holdoff

Specifies the length of time the digitizer waits after detecting a trigger before enabling the trigger subsystem to detect another trigger. The units are seconds. Details

Triggering:Trigger Slope

Specifies whether a rising or a falling edge triggers the digitizer. Details

Triggering:Trigger Coupling

Specifies how the digitizer couples the trigger source. Details

Triggering:Trigger Impedance

Sets the impedance for the trigger channel (NI 5112 only). Details

Triggering:Start To Ref Trigger Holdoff

Pass the length of time (in seconds) you want the digitizer to wait after it starts acquiring data until the digitizer enables the trigger system to detect a reference (stop) trigger. Details

Triggering:End of Record to Advance Trigger Holdoff

End of Record to Advance Trigger Holdoff is the length of time (in seconds) that a device waits between the completion of one record and the acquisition of pre-trigger samples for the next record. During this time, the acquisition engine state delays the transition to the Wait for Advance Trigger state, and will not store samples in onboard memory, accept an Advance Trigger, or trigger on the input signal..

Supported Devices: NI 5185/5186 Details

Triggering:Trigger Window:Window Mode

Specifies whether to trigger when the signal enters or leaves the window specified by the Trigger Window Low Level property or the Trigger Window High Level property. Details

Triggering:Trigger Window:Low Level

Pass the lower voltage threshold you want the digitizer to use for window triggering. Details

Triggering:Trigger Window:High Level

Pass the upper voltage threshold you want the digitizer to use for window triggering. Details

Triggering:Trigger Video:Signal Format

Specifies the video signal format to use. Details

Triggering:Trigger Video:Line Number

Specifies the line number to trigger on. Details

Triggering:Trigger Video:Polarity

Specifies whether the video signal is positive or negative. Details

Triggering:Trigger Video:Event

Specifies the event to trigger on. Details

Triggering:Trigger Video:Enable DC Restore

Restores the video-triggered data retrieved by the digitizer to the video signal's zero reference point. The default value is FALSE. Details

Triggering:Onboard Signal Processing:Ref Trigger Detection Location

Specifies which reference trigger detection circuitry to use on the device. Details

Triggering:Onboard Signal Processing:Ref Trigger Min Quiet Time

Specifies the amount of time (in seconds) the trigger circuit must not detect a signal above the trigger level (or below the trigger level if the trigger slope is negative) before the trigger is armed. This property is useful for triggering at the beginning of signal bursts instead of in the middle of signal bursts. The default value is 0. Details

Fetch:Fetch Record Number

Sets the record to fetch. The record is from a channel you specify. The default value is 0.

Valid Values: Values greater than or equal to 0 Details

Fetch:Fetch Number of Records

Fetches multiple records. If you want to fetch all records from the record you specify in the Fetch Record Number property to the last record configured, use -1. The default value is -1. Details

Fetch:Fetch Relative To

Specifies which point in the acquired waveform is the first to be fetched. This property specifies what the 'Fetch Offset' is relative to. Details

Fetch:Fetch Offset

Sets the offset in samples; the samples returned also depend on the Fetch Relative To property. The default value is 0.

Valid Values: All integers Details

Fetch:Data Transfer Block Size

Specifies the maximum number of samples to transfer at one time from the device to host memory. Increasing this number should result in better fetching performance because the driver does not need to restart the transfers as often. However, increasing this number may also increase the amount of page-locked memory required from the system. Details

Fetch:Fetch Meas Num Samples

Determines the number of samples to fetch from a digitizer when performing a measurement. -1 means fetch all samples from the Fetch Offset property to the end of the current record. The default value is -1. Details

Fetch:Points Done

Actual number of samples acquired since the last fetch, relative to the configured value for Fetch Relative To, including Fetch Offset, and for the current configured Fetch Record Number. Details

Fetch:Fetch Backlog

Specifies the number of points acquired that have not been fetched yet. Details

Fetch:Records Done

Returns the number of records your digitizer has acquired. Details

Fetch:Advanced:Maximum Bandwidth

Specifies the maximum bandwidth that the device is allowed to consume. The NI device limits itself to transfer fewer bytes per second on the PCIe bus than the value you specify for this property. Details

Fetch:Advanced:Preferred Packet Size

Specifies the preferred size of the data field in the PCI Express packet. In general, the larger the packet size, the more efficiently the device uses the bus. However, some systems, because of their implementation, perform better with smaller packet sizes. The value of this property must be a power of two (64, 128, ... , 512). Details

Clocking:Reference (Input) Clock Source

Specifies the input source for the PLL reference clock for all boards except the NI 5102. For the NI 5102 this property is the source of the board clock.

Defined Values

VAL_NO_SOURCE

VAL_PFI_0

VAL_PFI_1

VAL_PFI_2

VAL_PXI_CLOCK

VAL_CLK_IN

VAL_EXTERNAL

VAL_RTSI_CLOCK Details

Clocking:Reference Clock Rate

If Reference Clock Source is an external source, specifies the frequency (in hertz) of the input clock (reference clock) to which the internal sample clock timebase is synchronized. Details

Clocking:Output Clock Source

Specifies the output source for the 10 MHz clock to which another digitizer's sample clock can be phased-locked. Details

Clocking:Sample Clock Timebase Source

Specifies the source of the sample clock timebase, which is the timebase used to control waveform sampling. Details

Clocking:Sample Clock Timebase Rate

Specifies the frequency in hertz of the external clock used as the timebase source if the Sample Clock Timebase Source is an external source. Details

Clocking:Sample Clock Timebase Divisor

If Sample Clock Timebase Source is an external source, specifies the ratio between the sample clock timebase rate and the actual sample rate, which can be slower. Details

Clocking:Sample Clock Timebase Multiplier

If Sample Clock Timebase Source is an external source, this property specifies the ratio between the Sample Clock Timebase Rate and the actual sample rate, which can be higher. This property can be used in conjunction with the Sample Clock Timebase Divisor Property. Details

Clocking:Exported Sample Clock Output Terminal

Exports the sample clock to a specified terminal. This property is not supported by all digitizers. Details

Clocking:Clock Sync Pulse Source

For the NI 5102, specifies the line on which the sample clock is sent or received. For the NI 5112/5620/5621, specifies the line on which the one-time sync pulse is sent or received. Details

Clocking:PLL Lock Status

If TRUE, the PLL has remained locked to the external reference clock since it was last checked. If FALSE, the PLL has become unlocked from the external reference clock since it was last checked. Details

Clocking:Advanced:Oscillator Phase DAC Value

Gets or sets the binary phase DAC value that controls the delay added to the Phase Locked Loop (PLL) of the sample clock. The default value is " ". Details

Clocking:Advanced:Absolute Sample Clock Offset

Gets or sets the absolute time offset of the sample clock relative to the reference clock in terms of seconds. Details

Device:FPGA Bitfile Path

Gets the absolute file path to the bitfile loaded on the FPGA. Details

Synchronization:Start Trigger (Acq. Arm): Source

Specifies the source the digitizer monitors for an acquisition arm trigger. When an acquisition arm trigger is received, the digitizer begins acquiring pretrigger samples. Details

Synchronization:Start Trigger (Acq. Arm): Output Terminal

Specifies the destination to export the Start trigger. When the start trigger is received, the digitizer begins acquiring data. Refer to the device specifications document for a list of valid destinations. Details

Synchronization:Ready for Start:Output Terminal

Specifies the destination to export the Start trigger. When the start trigger is received, the digitizer begins acquiring data. Refer to the device specifications document for a list of valid destinations. Details

Synchronization:Advance Trigger:Source

Specifies the source the digitizer monitors for an advance trigger. When the advance trigger is received, the digitizer begins acquiring pretrigger samples for the next record. Details

Synchronization:Advance Trigger:Output Terminal

Specifies the destination for the advance trigger. When the advance trigger is received, the digitizer begins acquiring pretrigger samples. Details

Synchronization:Ready for Advance:Output Terminal

Specifies the destination for the advance trigger. When the advance trigger is received, the digitizer begins acquiring pretrigger samples. Details

Synchronization:Arm Reference Trigger: Source

Specifies the source the digitizer monitors for an arm reference trigger. When the arm reference trigger is received, the digitizer begins searching for the reference (stop) trigger from the user-configured trigger source. Details

Synchronization:Ready for Reference:Output Terminal

Specifies the destination for the Ready for Reference Event. When this event is asserted, the digitizer is ready to receive a reference trigger. Refer to the device-specific documentation in the NI High-Speed Digitizers Help for a list of valid destinations for your device. Details

Synchronization:End of Record:Output Terminal

Specifies the destination for the End of Record event. When this event is asserted, the digitizer has completed sampling a record. Refer to the device specifications document for a list of valid destinations. Details

Synchronization:End of Acquisition:Output Terminal

Specifies the destination for the End of Acquisition event. When this event is asserted, the digitizer has completed sampling all records. Refer to the device specifications document for a list of valid destinations. Details

Synchronization:5 Volt Power:Output Terminal

Specifies the destination for the 5 Volt power signal. Refer to the device specifications document for a list of valid destinations. Details

Synchronization:Trigger Calibration Delay:Trigger to Star Delay

A factory-programmed value that specifies the delay in seconds for the trigger to the PXI Star Trigger line. Details

Synchronization:Trigger Calibration Delay:Trigger to RTSI Delay

A factory-programmed value that specifies the delay in seconds for the trigger to the RTSI bus. Details

Synchronization:Trigger Calibration Delay:Trigger to PFI Delay

A factory-programmed value that specifies the delay in seconds for the trigger to the PFI lines. By itself, this property has no effect on the acquired data. Details

Synchronization:Trigger Calibration Delay:Trigger from Star Delay

A factory-programmed value that specifies the delay in seconds for PXI Star Trigger line to the trigger input. By itself, this property has no effect on the acquired data. Details

Synchronization:Trigger Calibration Delay:Trigger from RTSI Delay

A factory-programmed value that specifies the delay in seconds for the RTSI bus to the trigger input. By itself, this property has no effect on the acquired data. Details

Synchronization:Trigger Calibration Delay:Trigger from PFI Delay

A factory-programmed value that specifies the delay in seconds for the PFI lines to the trigger input. By itself, this property has no effect on the acquired data. Details

Synchronization:Trigger Calibration Delay:Slave Trigger Delay

Specifies the delay in seconds for the trigger from the master to the slave. Details

Synchronization:Record Arm Source

Specifies the source for the record arm. This property is only applicable to Traditional NI-DAQ (Legacy) devices. For SMC-based or USB devices, use the Synchronization:Advance Trigger:Source Property. Details

Synchronization:Master Enable

Specifies whether the device is a master or a slave. Details

Acquisition:Binary Sample Width

Indicates the bit width of the binary data in the acquired waveform, which can help you determine which Binary Fetch to use. Details

Acquisition:Resolution

Indicates the actual resolution in bits of valid data (as opposed to padding bits) in the acquired waveform. Compare to the Binary Sample Width property.

Valid Values: 8 to 32 Details

Acquisition:Acquisition Type

Specifies how the digitizer acquires data and fills the waveform record. Details

Acquisition:Sample Mode

Returns the sample mode the digitizer is currently using. Details

Acquisition:Delay before Initiate

Specifies a delay in seconds that is used by niScope_Initiate Acquisition to allow additional delay between programming of the vertical range, trigger level, DDC, and the start of the acquisition. This property is supported only on the NI 5112 and the NI 5620/5621. The default value is 0.0. Details

Acquisition:Advanced:Enable RIS in Auto Setup

Indicates whether the digitizer should use RIS sample rates when searching for a frequency in autosetup. Details

Waveform Measurement:Other Channel

Specifies the second channel for two-channel measurements, such as Add Channels. If processing steps are registered with this channel, the processing happens before the waveform is used in a two-channel measurement. The default value is 0. Details

Waveform Measurement:Array Gain

Every element of an array is multiplied by this scalar value during the array gain measurement. The default value is 1.0. Details

Waveform Measurement:Array Offset

Every element of an array is added to this scalar value during the array offset measurement. The default value is 0.0. Details

Waveform Measurement:Hysteresis Percent

Digital hysteresis that is used in several of the scalar waveform measurements. This property specifies the percentage of the full-scale vertical range for the hysteresis window size. The default value is 2%. Details

Waveform Measurement:Last Acq. Histogram Size

Specifies the size (that is, the number of bins) in the last acquisition histogram. This histogram is used to determine several scalar measurements, most importantly voltage low and voltage high. The default value is 256. Details

Waveform Measurement:Voltage Histogram:Size

Specifies the number of bins in the running voltage histogram. The default value is 256. Details

Waveform Measurement:Voltage Histogram:Low Volts

Specifies the minimum voltage value in the running voltage histogram. The default value is -10.0. Details

Waveform Measurement:Voltage Histogram:High Volts

Specifies the maximum voltage value in the running voltage histogram. The default value is 10.0. Details

Waveform Measurement:Time Histogram:Size

Determines the multiple acquisition time histogram size. The size is set during the first call to a time histogram measurement after you clear the measurement history with niScope Clear Waveform Measurement Stats. Details

Waveform Measurement:Time Histogram:Low Volts

Specifies the low voltage limit for the multi-acquisition time histogram. Only points in the waveform between the low and high voltage limits are included in the histogram. The default value is -10.0. Details

Waveform Measurement:Time Histogram:High Volts

Specifies the high voltage limit for the Multi-Acquisition time histogram. Only points in the waveform between the low and high voltage limits are included in the histogram. The default value is 10.0 V. Details

Waveform Measurement:Time Histogram:Low Time

Specifies the minimum time limit (in seconds) of the multi-acquisition time histogram, where the time is in seconds relative to the trigger position. Only points in the waveform between the low and high time limits are included in the histogram. The default value is -5.0e-4 . Details

Waveform Measurement:Time Histogram:High Time

Specifies the maximum time limit (in seconds) of the Multi-Acquisition time histogram, where the time is in seconds relative to the trigger position. Only points in the waveform between the low and high time limits are included in the histogram. The default value is 5.0e-4 . Details

Waveform Measurement:Interpolation:Polynomial Interpolation Order

Specifies the order of the polynomial used during the polynomial interpolation array measurement. For example, an order of 1 is linear interpolation whereas an order of 2 specifies parabolic interpolation. Any positive integer is valid. The default value is 1 (linear interpolation). Details

Waveform Measurement:Interpolation:Sampling Factor

The new number of points for polynomial interpolation is the sampling factor times the input number of points. The default value is 0.0. Details

Waveform Measurement:Filter:Type

Specifies the type of digital filter. The default value is lowpass. Details

Waveform Measurement:Filter:FIR Taps

Specifies the number of taps for the finite impulse response filter. This value must be odd if the filter type is highpass or bandstop. Otherwise, the magnitude response goes to zero as the frequency goes to half the sampling rate. The default value is 25.

Valid Values: >0 Details

Waveform Measurement:Filter:FIR Window

Specifies the FIR window type. The symmetric windows are applied to the FIR filter coefficients to limit passband ripple in FIR filters. The default value is None (0). Details

Waveform Measurement:Filter:Width

Specifies the width (in Hz) of a bandpass or bandstop filter. The cutoff frequencies are the (center frequency property ± 0.5 × filter width). The default value is 1.0e3. Details

Waveform Measurement:Filter:IIR Order

Specifies the order of the infinite impulse response filter. The default value is 2.

Valid Values: >0 Details

Waveform Measurement:Filter:Cutoff Frequency

Specifies the cutoff frequency in hertz for filters of type lowpass and highpass. The cutoff frequency definition varies depending on the filter. The default value is 1.0e6 Hz. Details

Waveform Measurement:Filter:Center Frequency

The center frequency in hertz for filters of type bandpass and bandstop. The width of the filter is specified by Filter Width, where the cutoff frequencies are the center width. The default value is 1.0e6 Hz. Details

Waveform Measurement:Filter:Ripple

Specifies the amount of passband ripple (in dB) for Chebyshev filters. More ripple gives a sharper cutoff for a given filter order. The default value is 0.1.

Valid Values: >0.0 Details

Waveform Measurement:Filter:Percent Waveform Transient

The percentage (0 - 100%) of the infinite impulse response (IIR) filtered waveform to eliminate from the beginning of the waveform. This action allows eliminating the transient portion of the waveform that is undefined due to the assumptions necessary at the boundary condition. The default value is 20.0%.

Valid Range: 0.0 - 100.0% Details

Waveform Measurement:Reference Levels:Channel Based Low Ref Level

Specifies the low reference level used in many scalar measurements. The default value is 10.0%. Details

Waveform Measurement:Reference Levels:Channel Based Mid Ref Level

Specifies the mid reference level used in many scalar measurements. The default value is 50%. Details

Waveform Measurement:Reference Levels:Channel Based High Ref Level

Specifies the high reference level used in many scalar measurements. The default value is 90%. Details

Waveform Measurement:Reference Levels:Units

Specifies the units for the waveform measurement reference levels. Details

Waveform Measurement:Reference Levels:Percentage Units Method

Specifies the method used to map percentage reference units to voltages. The default value is BaseTop. Details

Onboard Signal Processing:DDC:DDC Enabled

Enables/disables the digital downconverter (DDC) block of the digitizer. When the DDC block is disabled, all DDC-related properties are disabled and have no effect on the acquired signal. The default value is FALSE. Details

Onboard Signal Processing:DDC:Data Processing Mode

The way in which data is processed by the DDC block. The default value is Complex. Details

Onboard Signal Processing:DDC:Frequency Translation Enabled

Enables/disables frequency translating the data around the user-selected center frequency down to baseband. The default value is TRUE. Details

Onboard Signal Processing:DDC:Center Frequency

The frequency at which the DDC block frequency translates the input data. The default value is 10 MHz. Details

Onboard Signal Processing:DDC:Fetch Interleaved IQ Data

Specifies whether a fetch call retrieves a single waveform with I and Q interleaved, or two separate waveforms. If enabled, the number of elements returned by scalar fetch types (such as 16-bit integer) is twice the requested number of samples. If disabled during DDC acquisitions in Complex mode, two noninterleaved arrays of data are returned per channel, per record. Details

Onboard Signal Processing:DDC:Q Source

Specifies the channel that is the input to the Q data stream of the DDC. The default value is the channel to which the property is registered.

Valid Values: All valid channels for the device. Details

Onboard Signal Processing:DDC:Signal Adjustments:Frequency Translation:Frequency Translation Phase I

The I oscillator phase in degrees at the first point acquired. The default value is 0.

Valid Values

-360 to 360 Details

Onboard Signal Processing:DDC:Signal Adjustments:Frequency Translation:Frequency Translation Phase Q

The Q oscillator phase in degrees at the first point acquired. Use this property only when the Data Processing Mode property is set to Complex. The default value is 90.

Valid Values

-360 to 360 Details

Onboard Signal Processing:Equalization:Equalization Filter Enabled

Enables the onboard signal processing equalization FIR block, which is connected directly to the input signal. The equalization filter is designed to compensate the input signal for artifacts introduced to the signal outside of the digitizer. Because this filter is a generic FIR filter, any coefficients are valid. Coefficient values should be between +1 and -1. The default value is FALSE. Details

Onboard Signal Processing:Equalization:Equalization Num Coefficients

Returns the number of coefficients that the equalization FIR filter can accept. This filter is designed to compensate the input signal for artifacts introduced to the signal outside of the digitizer. Because this filter is a generic FIR filter, any coefficients are valid. Coefficient values should be between +1 and -1. Details

Onboard Signal Processing:Fractional Resample:Fractional Resample Enabled

Enables the onboard signal processing block that resamples the input waveform to the user desired sample rate. The default value is FALSE. Details

Onboard Signal Processing:OSP Overflow Error Reporting

Configures error reporting when the onboard signal processing block detects an overflow in any of its stages. Overflows lead to clipping of the waveform. The default value is Warning. Details

Peer-to-Peer:P2P Enabled

Specifies whether the digitizer writes data to the peer-to-peer endpoint. This property is endpoint-based. Details

Peer-to-Peer:Channels to Stream

Specifies which channels will be written to a peer-to-peer endpoint. If multiple channels are specified, they will be interleaved by sample. This property is endpoint-based. The default value is 0. Details

Peer-to-Peer:Endpoint Size

Returns the size, in samples, of the peer-to-peer endpoint. This property is endpoint-based. Details

Peer-to-Peer:Samples Available In Endpoint

Returns the current number of samples available to stream from a peer-to-peer endpoint. This property is endpoint-based. Details

Peer-to-Peer:Most Samples Available in Endpoint

Returns the most number of samples available to stream from a peer-to-peer endpoint since the last time this property was read. This property is endpoint-based. Details

Peer-to-Peer:Samples Transferred

Returns the number of samples transferred through the peer-to-peer endpoint since the endpoint was last reset. This property is endpoint-based. Details

Peer-to-Peer:Endpoint Overflow

Returns TRUE if the peer-to-peer endpoint has overflowed. Reset the endpoint to clear the overflow condition. This property is endpoint-based. Details

Peer-to-Peer:FIFO Endpoint Count

Returns the number of FIFO-based peer-to-peer endpoints this device supports. Details

Peer-to-Peer:Onboard Memory Enabled

Specifies whether the digitizer writes data to onboard memory when a peer-to-peer endpoint is enabled. Details

Peer-to-Peer:Stream Relative To

Determines which trigger peer-to-peer data is streamed relative to. The default value is Start Trigger. Details

Peer-to-Peer:Samples Transferred Per Record

Returns the number of samples transferred per record when you set the Stream Relative To property to Reference Trigger or Sync Trigger. Details

Peer-to-Peer:Manual:Manual Configuration Enabled

Enables and disables manual configuration of a peer-to-peer endpoint. These attributes cannot be used if an endpoint is being configured by NI-P2P, or a resource reservation error will result. This property is endpoint-based. Details

Peer-to-Peer:Manual:Configuration:Data Transfer Permission Address

Returns the address of a hardware register used to grant permission for the peer-to-peer endpoint to write data to another peer. The type of this address is determined by the Data Transfer Permission Address Type property. Permission is granted in bytes and the register is additive. This property is endpoint-based. Details

Peer-to-Peer:Manual:Configuration:Data Transfer Permission Address Type

Specifies the type of address returned to the user from the Data Transfer Permission Address property. This property is endpoint-based. Details

Peer-to-Peer:Manual:Configuration:Destination Window Address

Specifies the destination for data written by the peer-to-peer endpoint. The type of this address is specified by the Destination Window Address Type property. This property is endpoint-based. Details

Peer-to-Peer:Manual:Configuration:Destination Window Address Type

Specifies the type of the Destination Window Address property. This property is endpoint-based. Details

Peer-to-Peer:Manual:Configuration:Destination Window Size

Specifies the size, in bytes, of the destination window determined by the Destination Window Address and Destination Window Address Type properties. This property is endpoint-based. Details

Peer-to-Peer:Manual:Notification:Push Message On

Specifies the event to push the Message Push Value property to the Message Push Address property. Specifying Done will push the message when the acquisition has completed. This property is endpoint-based. Details

Peer-to-Peer:Manual:Notification:Message Push Address

Specifies the address to push the Message Push Value to on the event specified by the Push Message On property. This property is endpoint-based. Details

Peer-to-Peer:Manual:Notification:Message Push Address Type

Specifies the type of the Message Push Address property. This property is endpoint-based. Details

Peer-to-Peer:Manual:Notification:Message Push Value

Specifies the value to be pushed to the Message Push Address property on the event specified in the Push Message On property. This property is endpoint-based. Details

Device:Temperature

Returns the temperature of the device in degrees Celsius from the onboard sensor. Details

Device:Serial Number

Returns the serial number of the device. Details

Device:Accessory:Gain

Returns the calibration gain for the current device configuration. Details

Device:Accessory:Offset

Returns the calibration offset for the current device configuration. Details

Inherent IVI Attributes:User Options:Range Check

Specifies whether to validate property values and function parameters. If enabled, the instrument driver validates the parameter values that you pass to driver functions. Range checking parameters is very useful for debugging. After you validate your program, you can set this property to FALSE to disable range checking and maximize performance. The default value is TRUE. Use niScope Initialize with Options to override this value. Details

Inherent IVI Attributes:User Options:Query Instrument Status

Specifies whether the instrument driver queries the instrument status after each operation. Querying the instrument status is very useful for debugging. After you validate your program, you can set this property to FALSE to disable status checking and maximize performance. The instrument driver can choose to ignore status checking for particular properties regardless of the setting of this property. The default value is TRUE. Use niScope Initialize with Options to override this value. Details

Inherent IVI Attributes:User Options:Cache

Specifies whether to cache the value of properties. When caching is enabled, the instrument driver keeps track of the current instrument settings and avoids sending redundant commands to the instrument. Thus, you can significantly increase execution speed. The instrument driver can choose always to cache or never to cache particular properties, regardless of the setting of this property. The default value is TRUE. Use niScope Initialize with Options to override this value. Details

Inherent IVI Attributes:User Options:Simulate

Specifies whether to simulate instrument driver I/O operations. The default value is FALSE. Use niScope Initialize with Options to override this value. Details

Inherent IVI Attributes:User Options:Record Value Coercions

Specifies whether the IVI engine keeps a list of the value coercions it makes for ViInt32 and DBL properties. The default value is FALSE. Use niScope Initialize with Options to override this value. Details

Inherent IVI Attributes:User Options:Interchange Check

Specifies whether to perform interchangeability checking and log interchangeability warnings when you call VIs. Interchangeability warnings indicate that using your application with a different instrument might cause different behavior. Details

Inherent IVI Attributes:Driver Identification:Description

A string that contains the description of the instrument. Details

Inherent IVI Attributes:Driver Identification:Driver Prefix

A string that contains the prefix for the instrument driver. The name of each user-callable function in this driver starts with this prefix. Details

Inherent IVI Attributes:Driver Identification:Driver Vendor

A string that contains the name of the vendor that supplies this driver, for example, "National Instruments". Details

Inherent IVI Attributes:Driver Identification:Revision

The string that contains additional version information about this instrument driver. Details

Inherent IVI Attributes:Driver Identification:Class Specification Major Version

The major version number of the class specification with which this driver is compliant. Details

Inherent IVI Attributes:Driver Identification:Class Specification Minor Version

The minor version number of the class specification with which this driver is compliant. Details

Inherent IVI Attributes:Driver Capabilities:Supported Instrument Models

A string that contains a comma-separated list of the instrument model numbers supported by this driver. Details

Inherent IVI Attributes:Driver Capabilities:Class Group Capabilities

A string that contains a comma-separated list of class-extension groups that this driver implements. Details

Inherent IVI Attributes:Driver Capabilities:Channel Count

Indicates the number of channels that the specific instrument driver supports. For channel based properties, the IVI engine maintains a separate cache value for each channel. Details

Inherent IVI Attributes:Instrument Identification:Manufacturer

A string that contains the name of the instrument manufacturer, for example, "National Instruments". Details

Inherent IVI Attributes:Instrument Identification:Model

A string that contains the model number of the current instrument. Details

Inherent IVI Attributes:Instrument Identification:Firmware Revision

A string that contains the firmware revision information for the current instrument. Details

Inherent IVI Attributes:Advanced Session Information:Logical Name

A string that contains the logical name you specified when opening the current IVI session. Details

Inherent IVI Attributes:Advanced Session Information:Resource Descriptor

Indicates the resource descriptor the driver uses to identify the physical device. If you initialize the driver with a logical name, this property contains the resource descriptor that corresponds to the entry in the IVI Configuration utility. If you initialize the instrument driver with the resource descriptor, this property contains that value. Details

Device Specific:IF Digitizer (5620 and 5621):Combined Decimation

Returns the combined DDC decimation. Details

Device Specific:IF Digitizer (5620 and 5621):Carrier Mixer:NCO Center Frequency

Controls the frequency of the timing NCO. The default value is 0X8000000. Details

Device Specific:IF Digitizer (5620 and 5621):Carrier Mixer:Phase Offset

Offsets the phase of the timing NCO in binary format. The value is transferred to the active register during the next initiate acquisition. The default value is 0.

Valid Range: 0 to 6.283185307179586476925286766558 Details

Device Specific:IF Digitizer (5620 and 5621):CIC Filter:Decimation

Controls the decimation in the CIC filter. The CIC filter reduces the sample rate of a wideband signal to a rate that other filters in the DDC can process. The default value is 4.

Valid Range: 4 to 32 Details

Device Specific:IF Digitizer (5620 and 5621):CIC Filter:Shift Gain

Controls the shift gain at the input to the CIC filter. The CIC filter reduces the sample rate of a wideband signal to a rate that other filters in the DDC can process. The default value is 0.

Valid Range: 0 to 15 Details

Device Specific:IF Digitizer (5620 and 5621):Frequency Discriminator:Enable

Enables or disables the discriminator. If set to TRUE, frequency discriminator is enabled. The default value is FALSE. Details

Device Specific:IF Digitizer (5620 and 5621):Frequency Discriminator:FIR Decimation

Sets the amount of decimation. The default value is 1.

Valid Range: 1 to 8 Details

Device Specific:IF Digitizer (5620 and 5621):Frequency Discriminator:FIR Symmetry

Sets the discriminator FIR symmetry to symmetric or asymmetric. The default value is Symmetric. Details

Device Specific:IF Digitizer (5620 and 5621):Frequency Discriminator:FIR Symmetry Type

Sets the discriminator FIR symmetry type to even or odd. The default value is even. Details

Device Specific:IF Digitizer (5620 and 5621):Frequency Discriminator:FIR Taps

Sets the discriminator FIR number of taps. The default value is 1.

Valid Range: 1 to 63 Details

Device Specific:IF Digitizer (5620 and 5621):Frequency Discriminator:FIR Input Source

Sets the discriminator FIR input source to Phase, Magnitude, or Resampler. The default value is Phase. Details

Device Specific:IF Digitizer (5620 and 5621):Frequency Discriminator:Delay

Sets the number of delays in the discriminator. The default value is 1.

Valid Range: 1 to 8 Details

Device Specific:IF Digitizer (5620 and 5621):Frequency Discriminator:Phase Multiplier

Programs the coordinate converter to multiply the phase output by 1, 2, 4, or 8. Multiplying the phase output removes phase modulation before the frequency is measured. The default value is 0. Details

Device Specific:IF Digitizer (5620 and 5621):Programmable FIR Filter:Decimation

Specifies the programmable FIR filter decimation. The default value is 1. Details

Device Specific:IF Digitizer (5620 and 5621):Programmable FIR Filter:Symmetry

Sets either a Symmetric or Asymmetric filter. The default value is Symmetric. Details

Device Specific:IF Digitizer (5620 and 5621):Programmable FIR Filter:Symmetry Type

Sets either even or odd symmetry. The default value is Even. Details

Device Specific:IF Digitizer (5620 and 5621):Programmable FIR Filter:Taps

Defines the number of taps (in other words, coefficients) for a FIR filter. The default value is 25. Details

Device Specific:IF Digitizer (5620 and 5621):Programmable FIR Filter:Real/Complex

Sets either a Complex filter or a dual Real filter. The default value is Real. Details

Device Specific:IF Digitizer (5620 and 5621):AGC:Upper Gain Limit

Sets the maximum gain and minimum signal levels in the AGC. The default value is 6.020600. Details

Device Specific:IF Digitizer (5620 and 5621):AGC:Lower Gain Limit

Sets the minimum gain and maximum signal levels in the AGC. The default value is 6.020600. Details

Device Specific:IF Digitizer (5620 and 5621):AGC:Loop Gain 0 Exponent

Along with the AGC Loop Gain 0 Mantissa property, sets the loop gain for the AGC. The default value is 0. Details

Device Specific:IF Digitizer (5620 and 5621):AGC:Loop Gain 0 Mantissa

Along with the AGC Loop Gain 0 Exponent property, sets the loop gain for the AGC. The default value is 0. Details

Device Specific:IF Digitizer (5620 and 5621):AGC:Loop Gain 1 Exponent

Along with AGC Loop Gain 1 Mantissa property, sets the loop gain for the AGC. The default value is 0. Details

Device Specific:IF Digitizer (5620 and 5621):AGC:Loop Gain 1 Mantissa

Along with AGC Loop Gain 1 Exponent property, sets the loop gain for the AGC. The default value is 0. Details

Device Specific:IF Digitizer (5620 and 5621):AGC:Threshold

Sets the gain error in the AGC. The default value is 0x034D. Details

Device Specific:IF Digitizer (5620 and 5621):AGC:Average Control

Averages the AGC values. The default value is Mean. Details

Device Specific:IF Digitizer (5620 and 5621):HalfBand Filter:Bypass

Enables or bypasses the halfband filters. If set to TRUE, halfband filters are bypassed. The default is TRUE. Details

Device Specific:IF Digitizer (5620 and 5621):HalfBand Filter:Filter 1 Enable

Enables halfband filter 1. If TRUE, filter is enabled. The default is TRUE. Details

Device Specific:IF Digitizer (5620 and 5621):HalfBand Filter:Filter 2 Enable

Enables halfband filter 2. If TRUE, filter is enabled. The default is FALSE. Details

Device Specific:IF Digitizer (5620 and 5621):HalfBand Filter:Filter 3 Enable

Enables halfband filter 3. If TRUE, filter is enabled. The default is FALSE. Details

Device Specific:IF Digitizer (5620 and 5621):HalfBand Filter:Filter 4 Enable

Enables halfband filter 4. If TRUE, filter is enabled. The default is FALSE. Details

Device Specific:IF Digitizer (5620 and 5621):HalfBand Filter:Filter 5 Enable

Enables halfband filter 5. If TRUE, filter is enabled. The default is FALSE. Details

Device Specific:IF Digitizer (5620 and 5621):Output Configuration:Parallel:AOUT Source

Specifies the source for the AOUT parallel output from the DDC. The default is I Data. Details

Device Specific:IF Digitizer (5620 and 5621):Output Configuration:Parallel:BOUT Source

Specifies the source for the BOUT parallel output from the DDC. The default is Q Data. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Device Number

Indicates the device number associated with the current session. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Enable DDC

Disables programming the DDC when set to FALSE. The default value is TRUE. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:DDC Direct Register Address

Used for directly accessing the DDC registers. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:DDC Direct Register Data

Used for directly accessing the DDC registers. The default value is 0. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Fetch Interleaved Data

Set to TRUE to retrieve one array with alternating values on the NI 5620/5621. This property can be used to retrieve a single array with I and Q interleaved instead of two separate arrays. If set to TRUE, the resulting array is twice the size of the actual record length. The default value is FALSE. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Mux Mode

Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Serial DAC Cal Voltage

Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Test Mode Sin/Cos

Enables the special test mode where the carrier NCO outputs are set to 0x7FFF. The default is FALSE. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Coordinate Converter Input

Selects the source for the input to the coordinate converter, either the HB filter or the Programmable FIR. the default value is Programmable FIR. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Q Input to Coord. Converter

Either enables or zeros out the Q input to coordinate converter. The default value is I and Q. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Syncout CLK Select

Source for Syncout CLK. The default value is CLK IN. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Enable Dither

Applies dither at the input of the ADC. Set this property to TRUE to enable dither. The default value is FALSE. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Timing NCO:Phase Accum. Load on Update

When TRUE, updates the timing NCO frequency to zero the feedback of the phase accumulator as well as update the phase and frequency. The default value is TRUE. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Timing NCO:Clear Phase Accum.

If FALSE, enables the accumulator in the timing NCO. If TRUE, zeros out feedback in the accumulator. The default value is FALSE. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Timing NCO:Enable Offset Freq.

If TRUE, enables offset frequency in the timing NCO. If FALSE, applies no offset frequency. The default value is FALSE. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Timing NCO:Frequency Offset Bits

Specifies the number of offset bits in the timing NCO. The default value is 8 bits. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Timing NCO:Center Frequency

Controls the frequency of the timing NCO. Specifies the timing NCO center frequency in binary format:

N = (Fout / Fresampler) & 232

where Fout is the output frequency and Fresampler is the resampled frequency.

The value is transferred to the active register during the next initiate acquisition operation. The default value is 0X8000000. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Timing NCO:Phase Offset

Offsets the phase of the timing NCO in binary format. The value is transferred to the active register during the next initiate acquisition. The default value is 0.

Valid Range: 0 to 6.283185307179586476925286766558 Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Resampler:Filter Mode

Selects the resampling filter mode. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Resampler:Bypass

Either enables or bypasses the resampler filter in the DDC. The resampler is a polyphase filter that allows the output sample rate to have a non-integer relationship to the input sample rate. In essence, it acts as a fixed interpolation filter followed by an NCO controlled decimator. The default value is TRUE. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Resampler:Output Pulse Delay

Programs the delay between output samples when interpolating. These outputs can be delayed from 2 to 255 clocks. The default value is 16. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Resampler:NCO Divide

Divides down the resampler NCO output by the value loaded into the register plus one. The default value is 2. Details

Device Specific:IF Digitizer (5620 and 5621):Advanced:Resampler:Reference Divide

Divides down the reference clock by the value loaded into the register plus one. Load with a value that is one less than the desired period. The default value is 2. Details

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