ADGAIN <
range
>
1020
16
Generates the Gain Correction Constant for the indicated A/D range.
<
range
>
is an integer from -1 to 4, where 4 indicates the highest range. The
“ hi” and “ lo” values of the on-board calibration source (for the given
range) must previously have been measured with a transfer-quality external
voltmeter, and the measured values must have been given to the card using
the
SPANHI
and
SPANLO
commands. The following is the recommended
command sequence for each
<
range
>
:
1.
SOURCE <
range
> <
0
>
2. [measure source voltage with external voltmeter on “ autorange” ]
3.
SPANLO <
range
> <
Volts (msw)
> <
Volts (lsw)
>
4. [execute “ range hold” function on external voltmeter]
5.
SOURCE <
range
> <
1
>
6. [measure source voltage with external voltmeter]
7.
SPANHI <
range
> <
Volts (msw)
> <
Volts (lsw)
>
8.
ADGAIN <
range
>
The Gain Correction Constant is loaded into the A/D subsystem’s register
file (and is kept in CPU data RAM), but is not stored in Flash Memory until
receipt of a
STORECAL
command.
ADZERO
1010
16
Generates the A/D Coarse Offset, and the A/D Fine Offset correction
constants for each A/D range, based on the card’s internal short.
ADZERO
is intended to be executed more frequently than
CARDCAL
. It executes
much more quickly, because it only updates constants associated with the
A/D Converter offset voltage. This command corrects any short-term drift
due to temperature changes in the A/D Converter. This command sets the
calibration relays to their normal (measurement) position at its conclusion.
CARDCAL
1000
16
CARDCAL
calibrates the HP E1413 for gain and offset voltage of the Signal
Conditioning Plug-ons (SCPs). Every channel containing in input-type SCP
is calibrated for every usable A/D measurement range. If programmable
SCPs are present, the
CARDCAL
command calibrates for the present SCP
gain and filter settings.
CARDCAL
calibrates the on-card current source,
using the resistor value stored by the
RESCAL
command.
CARDCAL
then
reloads the A/D subsystem’s register file with the new calibration constants.
The derived channel constants are valid only for the current SCP module
settings. If these settings are changed, the
CARDCAL
command should be
executed again before making further measurements. When execution is
complete,
CARDCAL
sets the calibration relays to their normal
(measurement) position.
364 Register-Based Programming
Appendix D
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