Keithley SourceMeter 3A 2420 Service Manual page 116

B-4 Command Reference
Description
Note
Example
:SAVE
(:CALibration:PROTected:SAVE)
Purpose
Format
Description
Note
Example
:DATE
(:CALibration:PROTected:DATE)
Purpose
Format
Parameters
Query
Response
Description
Note
Example
The :LOCK command allows you to lock out comprehensive calibration af-
ter completing those procedures. Thus, :LOCK performs the opposite of
sending the password with the :CODE command. The :LOCK? query returns
calibration lock status.
To unlock calibration, send the :CODE command with the appropriate pass-
word.
:CAL:PROT:LOCK
To save calibration constants in EEROM after the calibration procedure.
:cal:prot:save
The :SAVE command stores internally calculated calibration constants de-
rived during comprehensive in EEROM. EEROM is non-volatile memory,
and calibration constants will be retained indefinitely once saved. Generally,
:SAVE is sent after all other calibration steps (except for :LOCK).
Calibration will be only temporary unless the :SAVE command is sent to per-
manently store calibration constants. Calibration data will not be saved if: (1)
calibration was not unlocked by sending the :CODE command, (2) invalid
data exists (for example, cal step failed or was aborted.), or (3) an incomplete
number of cal steps were performed (for example, omitting a negative full-
scale step).
:CAL:PROT:SAVE
To program the calibration date.
:cal:prot:date <year>, <month>, <day>
<year> = 1997 to 2096
<month> = 1 to 12
<day> = 1 to 31
:cal:prot:date?
<year> , <month> , <day>
The :DATE command allows you to store the calibration date in instrument
EEROM for future reference. You can read back the date from the instrument
by using the :DATE? query, or by using the front panel CAL menu.
The year, month, and day parameters must be delimited by commas.
:CAL:PROT:DATE 1997,11,20
Lock out calibration
Save calibration constants
Send cal date (11/20/97).