Analog Output Voltage Mode Calibration (Continued)
7. Determine the offset calibration constant by dividing the ZERO value
by the difference of the +FS value and the ZERO value and then
inverting the result. Offset constant = –[ZERO / (+FS – ZERO)].
8. Use the CALZ command to send the offset calibration constant.
Example:
ZERO DMM Reading: –0.05632
+FS DMM Reading: 10.0135
Offset Constant Calculation:
–(–0.05632 / (10.0135 –(–0.05632))) = 0.00559
Calibration Command: CALZ 2,0,0.00559
9. Determine the gain calibration constant by adding the +FS reading to
the inverse of the ZERO reading obtained in step 3 and dividing that
number into 10. Gain constant = 10 / (+FS – ZERO).
10. Use the CALG command to send the gain calibration constant.
Example:
ZERO DMM Reading: –0.05632
+FS DMM Reading: 10.0135
Gain Constant Calculation: 10 / (10.0135 – (–0.05632)) = 0.99307
Calibration Command: CALG 2,0,0.99307
5.6.3.2 Analog Output Current Mode Calibration
Purpose
To determine the analog output current mode offset and gain errors and
provide offset and gain calibration constants back to the 211.
Process
1. Reset the calibration constants to their default values using the CALZ
and CALG commands.
Example:
Zero Offset Reset Command: CALZ 2,1,0
Gain Reset Command: CALG 2,1,1
2. resistor using the DMM.
3. resistor standard to the analog output with the two
current leads. Connect the DMM to the two voltage leads of the resistor
standard.
4. Set the analog output to manual mode, manual output of 0% (4 mA).
Example:
Manual Zero Current Command: ANALOG 3,0
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