Keithley SourceMeter 3A 2420, Service Manual

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Calibration 2-15
Remote calibration commands
Table 2-5 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. ( For example, omitting a negative full-scale step).
Ranges that calibrated successfully will be saved if calibration is unlocked. Ranges that failed will not be saved.
Recommended calibration parameters
The maximum calibration command parameter ranges are: 75% to 150% of full scale for pos-
itive and negative full scale calibration points; ± zero calibration steps have ±50% of full scale
for valid entry ranges. However, for optimum calibration, it is recommended that you use cali-
bration points within the ranges listed in Table 2-6 and Table 2-7. Note that each sense range
requires three parameters: zero, negative full scale, and positive full scale. Similarly, each source
range requires four parameters: two zero parameters, a positive full-scale parameter, and a neg-
ative full-scale parameter.
Table 2-5
Remote calibration command summary
Command Description
:CALibration
:PROTected
:CODE '<password>'
:COUNT?
:SAVE
:LOCK
:LOCK?
:DATE <y>,<m>,<d>
:DATE?
:NDUE <y>,<m>,<d>
:NDUE?
:SENSe <nrf>
:DATA?
:SOURce <nrf>
:DATA?
Calibration subsystem.
Cal commands protected by password.
Unlock cal; changes password if cal is already unlocked.
(Default password: KI002420.)
Query number of times 2420 has been calibrated.
Save calibration data to EEPROM.*
Lock calibration, inhibit SAVE command operation.
Request cal lock status.
Program calibration year, month, day.
Query calibration year, month, day.
Program calibration due year, month, day.
Query calibration due year, month, day.
Calibrate active measure range. (See Table 2-6 parameters.)
Query measurement cal constants for active range.
Calibrate active source range. (See Table 2-7 parameters.)
Query source cal constants for active range.