Current Calibration
Current Programming and Measurement
Step 1.Disconnect all equipment form the output terminals.
Step 2. Select the current programing and measurement calibration.
Front Panel Menu Reference SCPI Command
Select System\Admin\Cal\Curr\Iprog.
Check that nothing is connected to the output and select
Next.
Specify the full-scale current range. Full scale
ranges vary by model. This selects the 20 A range:
CAL:CURR 20
Step 3. Select the first current calibration point.Wait 5 minutes for the temperature to settle.
Front Panel Menu Reference SCPI Command
Wait 5 minutes, then select Next again. CAL:LEV P1
*OPC?
Step 4.Connect a precision shunt resistor to the output. The shunt resistor should be able to measure
at least 70% of the output’s full-scale current (see Cal Setup B). Connect the Keysight 3458A DMM
across the shunt resistor.
Front Panel Menu Reference SCPI Command
Check thatthe shunt is connected and select Next. Not applicable
Step 5.Select the second current calibration point. Wait 5 minutes for the temperature to settle.
Calculate the shunt current (I=V/R) and enter the data.
Front Panel Menu Reference SCPI Command
Display shows: “Enter P2 measured data”.Enter the data
from the external DMM. This should be about 70% of the
full-scale current rating. Press Enter when done.Press
Back to finish.
CAL:LEV P2
*OPC?
CAL:DATA <data>
Current Sharing Calibration
This procedure calibrates the Imon signal that is used when units are connected in parallel.
Step 1. Connect a short across the + and - output terminals. Connect the Keysight 3458A DMM across
pins 2 and 3 of the Sharing connector (see Cal Setup C).
Step 2. Select the current sharing calibration.
Front Panel Menu Reference SCPI Command
Select System\Admin\Cal\Misc\CurrShar.
Check that the short is connected and select Next.
CAL:CURR:SHAR
Keysight RP7900 Series Operating and Service Guide 277
6 Verification and Calibration
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