Calibration Procedure
Calibration Interval
Enter Calibration Mode
Voltage Calibration
Voltage Common Mode Rejection Ratio Calibration
Current Calibration
Current Temperature Coefficient Calibration
Current Sharing Calibration
Resistance Bottom-Out Calibration
Enter a Calibration Date
Save Calibration and Log Out
Introduction
The instrument features closed-case electronic calibration; no internal mechanical adjustments are
required. The instrument calculates correction factors based on input reference values that you set
and stores correction factors in non-volatile memory until the next calibration adjustment is
performed. This EEPROM calibration memory is not changed by cycling power or *RST.
Refer to the Recommended Test Equipment and Setups section for a list of the equipment and test
setups required for calibration. Refer to the Measurement Techniques section for information about
connecting the voltmeter, current shunt, and load. Additional information about calibration follows.
l The correct password is required to enter the Admin menu, which contains the calibration function.
The password is pre-set to 0 (zero). You can change the password once calibration mode is
entered to prevent unauthorized access to the calibration mode. Refer to Password Protection for
more information.
l When calibrating the unit using SCPI commands, most steps involve sending a *OPC? query to syn-
chronize with the power system’s command completion before proceeding. The response from the
instrument must be read each time *OPC? is given. In some steps, it may take up to 30 seconds for
*OPC? to respond.
l Once started, you must complete each calibration section in its entirety. As each calibration sec-
tion is completed, the instrument calculates new calibration constants and begins using them.
However, these constants are not saved in nonvolatile memory until a SAVE command is explicitly
given.
l Exit the calibration mode either by logging out of the Admin menu or by sending CAL:STAT OFF.
Note that any calibration section that was calibrated but not saved will revert to its previous cal-
ibration constants.
7 Verification and Calibration
316 Keysight N6900/N7900 Series Operating and Service Guide
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