Calibration
2-11
Step 4: +20V DC calibration
1. Set the DC calibrator output to +20.00000V.
2. Send the following command to the instrument:
:CAL:PROT:DC:HIGH 20
(Send the actual calibration value in the range of 9.8V to
21V if you are using a different voltage.)
3. Wait until the Model 2001 finishes this step before going
on.
Step 5: 20k¾ calibration
1. Set the calibrator output to 19.0000k¾, and turn external
sense on.
NOTE
If your calibrator can source 20k¾, use
that value instead of the 19k¾ value.
2. Send the following command to the Model 2001:
:CAL:PROT:DC:LOHM <value>
Here, <value> is the actual calibrator resistance value.
For example, if the calibrator resistance is 18.9987k¾,
the command would appear as follows:
:CAL:PROT:DC:LOHM 18.9987E3
(The allowable range for this parameter is from 9E3 to
20E3.)
3. Wait until the Model 2001 finishes 20k¾ calibration be-
fore continuing.
Step 6: 1M¾ calibration
1. Set the calibrator output to 1.0000M¾, and turn external
sense off.
2. Send the following command to the Model 2001:
:CAL:PROT:DC:HOHM <value>
Here, <value> is the actual calibrator resistance value.
For example, if the calibrator resistance is 1.00023M¾,
the command would appear as follows:
:CAL:PROT:DC:HOHM 1.00023E6
(The allowable range for this parameter is from 800E3
to 2E6.)
3. Wait until the Model 2001 finishes 1M¾ calibration be-
fore continuing.
Step 7. Open-circuit calibration
1. Disconnect all test leads from the Model 2001 INPUT
and SENSE jacks.
2. Send the following command to the instrument:
:CAL:PROT:DC:OPEN
3. Wait until open-circuit calibration is complete before
going on to the next step.
Step 8: Calculate DC calibration constants
To program the Model 2001 to calculate new DC calibration
constants, send the following command over the bus:
:CAL:PROT:DC:CALC
Step 9: Check for DC calibration errors
You can check for DC calibration errors over the bus by
sending the following query:
:SYST:ERR?
If no errors are reported, DC calibration is successful, and
you can proceed to the next step.
Step 10: Perform AC user calibration
To perform user AC calibration, send the following com-
mand:
:CAL:UNPR:ACC
Note that AC calibration will take about six minutes to com-
plete.
Step 11: Check for AC calibration errors
To check for AC calibration errors, send the following query:
SYST:ERR?
If the unit sends back a “No error” response, AC calibration
was successful.
Step 12: Enter calibration dates
To set the calibration date and next due date, use following
commands to do so:
:CAL:PROT:DATE ‘1/01/92’ (programs calibration date)
:CAL:PROT:NDUE ‘1/01/93’ (programs next calibration due
date)
Step 13: Save calibration constants
Calibration is now complete, so you can store the calibration
constants in EEROM by sending the following command:
:CAL:PROT:SAVE
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