NI DC Power Supplies and SMUs Help (NI-DCPower)
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The source unit can output configurable voltage pulses or current pulses.
Pulsing in Single Point Source Mode
In Single Point source mode, the source unit generates a single pulse, then returns to the pulse bias level.
The following figure illustrates a single pulse cycle.
The following steps illustrate the typical operation of the source unit for each pulse when you initiate a pulse output function:
- To enable pulsing, set the niDCPower Output Function property to Pulse Voltage or Pulse Current or set the NIDCPOWER_ATTR_OUTPUT_FUNCTION attribute to NIDCPOWER_VAL_PULSE_VOLTAGE or NIDCPOWER_VAL_PULSE_CURRENT.
- (Optional) In Sequence source mode, if this is not the first step in a sequence, the source unit emits a Ready For Pulse Trigger event and waits for a Pulse trigger.
- After receiving the Pulse Trigger, the source unit applies the pulse level configuration. In Sequence mode, this is the next pulse level in the array.
- After waiting the time specified by the source delay, the source unit generates a Source Complete event. In Sequence mode, if you specify source delay on a per-step basis then this time is optionally the next source delay in the array.
- (Optional) To specify that the measure unit now takes a measurement and stores it in a buffer on the device, set the niDCPower Measure When property to Automatically After Source Complete or the NIDCPOWER_ATTR_MEASURE_WHEN attribute to NIDCPOWER_VAL_AUTOMATICALLY_AFTER_SOURCE_COMPLETE.
- After waiting the remainder of the pulse on time, the source unit applies the pulse bias configuration.
- After waiting the pulse bias delay, the source unit emits a Pulse Complete event.
- The source unit waits the remainder of the pulse off time.
- At commit, the bias settings are applied to the output.
Pulsing in Sequence Source Mode
In Sequence source mode, the source unit applies a list of pulse levels in succession while still maintaining the specified duty cycle by applying the specified Pulse On and Pulse Off times. The following figure illustrates a sequence consisting of two pulses. The sequence is repeated twice.
||Note Timing properties or attributes for pulses, such as pulse on time, pulse off time, and pulse bias delay, must be constant for all steps in the sequence.
Refer to Sequence source mode for general information about trigger and event behavior in sequences.
Pulsing in an Advanced Sequence
Pulsing in an advanced sequence differs from pulsing in sequence source mode in the following ways:
- All pulse-related properties or attributes can be reconfigured per step in an advanced sequence.
Pulse Source Model
The following table shows the properties applied for each pulse output function.
|Pulse Voltage||Pulse Current|
|Pulse Voltage Level||Pulse Current Level|
|Pulse Bias Voltage Level||Pulse Bias Current Level|
|Pulse Voltage Level Range||Pulse Current Level Range|
|Pulse Current Limit1||Pulse Voltage Limit1|
|Pulse Current Limit High2||Pulse Voltage Limit High2|
|Pulse Current Limit Low2||Pulse Voltage Limit Low2|
|Pulse Bias Current Limit1||Pulse Bias Voltage Limit1|
|Pulse Bias Current Limit High2||Pulse Bias Voltage Limit High2|
|Pulse Bias Current Limit Low2||Pulse Bias Voltage Limit Low2|
|Pulse Current Limit Range||Pulse Voltage Limit Range|
1Applied when the Compliance Limit Symmetry property is set to Symmetric or the NIDCPOWER_ATTR_COMPLIANCE_LIMIT_SYMMETRY attribute is set to NIDCPOWER_VAL_SYMMETRIC.
2Applied when the Compliance Limit Symmetry property is set to Asymmetric or the NIDCPOWER_ATTR_COMPLIANCE_LIMIT_SYMMETRY attribute is set to NIDCPOWER_VAL_ASYMMETRIC.
The following attributes are applied for both pulse output functions:
- Source Delay
- Pulse Bias Delay
- Pulse On Time
- Pulse Off Time
Support for Pulsing
The following devices do not support this feature: