Keithley 2303, Service Manual, Page: 39 / 104

2-14 Calibration
Remote calibration
Follow the procedure outlined below to perform Model 2303, 2303B, and 2303-PJ remote
calibration by sending SCPI commands over the IEEE-488 bus. The remote commands and
appropriate parameters are separately summarized for each step.
Remote calibration commands
Table 2-4 summarizes remote calibration commands. For a more complete description of
these commands, refer to Appendix B.
* Calibration data will not be saved if:
1. Calibration was not unlocked with :CODE command.
2. Invalid data exists. (For example, cal step failed or was aborted.)
3. Incomplete number of cal steps were performed.
4. Calibration was not performed in the proper sequence.
Table 2-4
Remote calibration command summary
Command Description
:CALibration Calibration subsystem.
:PROTected Cal commands protected by password.
:CODE '<code>' Unlock cal; changes code if cal is already unlocked. (Default
code: KI002303.)
:COUNt? Query number of times 2303 has been calibrated.
:DATE <yyyy>,<mm>,<dd> Program calibration year, month, day.
:DATE? Query calibration year, month, day.
:INIT Initiate calibration (must be sent before other cal steps).
:SAVE Save calibration data to EEPROM.*
:LOCK Lock out calibration. (Abort if calibration is incomplete.)
:STEP0 <nrf> Output full-scale voltage (14V).
:STEP1 <nrf> Calibrate output voltage setting using external DMM reading.
:STEP2 <nrf> Calibrate voltage measuring using external DMM reading.
:STEP3 Perform DVM input full-scale (14V) cal.
:STEP4 <nrf> Output current (1.9A) for 5A full-scale cal.
:STEP5 <nrf> Calibrate output current limit using calculated current.
:STEP6 <nrf> Calibrate 5A measurement range using calculated current.
:STEP7 Output 5mA (500mA, Model 2303-PJ) nominal current for 5mA
(500mA) range full-scale cal.
:STEP8 <nrf> Calibrate 5mA (500mA, Model 2303-PJ) measurement range
using calculated current.
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