Adjusting Voltage Programming Accuracy - National Instruments PXI-4130 Calibration Procedure

Close session and commit new calibration coefficients: To complete adjustment of the
4.
range, call the niDCPower Close External Calibration VI (
function) to close the session. To write new calibration coefficients to the hardware, specify
an action of Commit. At this time, the calibration date and temperature stored onboard are
also updated.
You can adjust any voltage or current range individually by opening a
Note
calibration session, adjusting, and then closing the session with an action of Commit.
To adjust all voltage and current ranges simultaneously, open a single calibration
session, execute multiple adjustment steps, and then close the session with an action
of Commit to write coefficients for multiple ranges simultaneously.
If the NI 4130 passes initial verification and is within all test limits,
Note
NI recommends, but does not require, an adjustment to guarantee the published
specifications for the next year. If you choose to skip adjustment, run the niDCPower
Initialize External Calibration VI and end with the niDCPower Close External
Calibration VI with action set to Commit to update the calibration date and onboard
calibration temperature without making any adjustments to the device.
After adjustment, repeat the

Adjusting Voltage Programming Accuracy

To adjust voltage programming, compare a set of requested voltage output points to the actual
voltage as measured by an external DMM. Configure the voltage level using the Output value
for the iteration of channel x in Table 18.
To ensure the system has had adequate time to settle, wait one second after requesting a new
voltage before taking a measurement with the DMM.
Use the niDCPower Cal Adjust Voltage Level VI (
function) to calculate the new calibration coefficients. Pass the voltage setpoints requested by
the NI 4130 to the Requested Outputs input of the VI and the voltage values measured by the
DMM to the Measured Outputs input of the VI. Call this VI or function once for the positive
setpoints and once for the negative setpoints specified for each range in Table 18.
Verification
section to verify that the adjustment was successful.
NI PXI-4130 Calibration Procedure | © National Instruments | 33
niDCPower_CloseExtCal
niDCPower_CalAdjustVoltageLevel