When
*CAL?
finishes, it returns a +0 value to indicate success. The
generated calibration constants are now in volatile memory as they always
are when ready to use. If the configuration just calibrated is to be fairly
long-term, you should now execute the
CALibration:STORe ADC
command
to store these constants in non-volatile memory. That way the module can
restore calibration constants for this configuration in case of a power failure.
After power returns, and after the module warms up, these constants will be
relatively accurate.
When to Re-Execute
*CAL?
•
When you change the channel gain and/or filter cut-off frequency on
programmable SCPs (using
INPut:GAIN
or
INPut:FILTer:
…
commands).
•
When you reconfigure SCPs to different locations. This is true even
if you replace an SCP with an identical model SCP because the
calibration constants are specific to each SCP channel’s individual
performance.
•
When the ambient temperature within the mainframe changes
significantly. Temperature changes affect accuracy much more than
long-term component drift.
Note
To save time when performing channel calibration on multiple
HP E1313/E1413s in the same mainframe, use the
CAL:SETup
and
CAL:SETup?
commands (see these commands in Chapter 5 for details).
82 Using the HP E1313/E1413
Chapter 3
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