NI PXIe-4113 Aperture Time

NI DC Power Supplies and SMUs Help (NI-DCPower)

Edition Date: January 2018

Part Number: 370736U-01

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The NI PXIe-4113 supports aperture times based on the power line frequency of the device. The NI PXIe-4113 acquires samples at a fixed rate of 1/10500 s, a single period of a 10.5 kHz clock. When you set an aperture time to acquire a measurement, the NI PXIe-4113 acquires the number of samples that occur during the aperture time, averages the samples, then returns one measurement that represents the average reading over the specified aperture time. As a result, the aperture time must be a multiple of 1/10500 s. If you specify an aperture time that is not a multiple of 1/10500 s, NI-DCPower coerces the value to the next highest valid aperture time.

Use the niDCPower Configure Aperture Time VI or the niDCPower_ConfigureApertureTime function to set the aperture time of the device. Use the niDCPower Configure Power Line Frequency VI or the niDCPower_ConfigurePowerLineFrequency function to set the power line frequency of a specified channel of the device.

For information about how aperture time is related to acquiring measurements and triggering on the NI PXIe-4113, refer to NI PXIe-4113 Measurement Configuration and Timing and NI PXIe-4113 Triggers and Events.

Rejecting Power Line Noise

You can reject power line noise from the signal by adjusting the aperture time.

Example 1

To reject 60 Hz noise frequency from a signal, set the power line frequency to 60 Hz, set the aperture units to power line cycles (PLCs), and set the aperture time to 1.

Example 2

To reject 50 Hz noise frequency from a signal, set the power line frequency to 50 Hz, set the aperture units to PLCs, and set the aperture time to 1.

Related Topics

NI PXIe-4113 Triggers and Events

NI PXIe-4113 Measurement Configuration and Timing

Aperture Time

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