Calibration
2-25
prehensive commands, or Table 2-8 for low-level com-
mands.) Remember that you must unlock calibration first.
Before sending any calibration commands, you must send
the ":CAL:PROT:INIT" command to intialize calibration.
After calibrating the desired point(s), you must then save the
new calibration constants by sending the
":CAL:PROT:SAVE" command over the bus. You can then
lock out calibration by sending ":CAL:PROT:LOCK".
Example
As an example, assume that you intend to calibrate the 2k
Ω
range. The basic steps are summarized below:
1. Turn on the Model 2002 power, and allow the instru-
ment to warm up for at least four hours before perform-
ing calibration.
2. Press the front panel CAL switch to unlock calibration.
3. Send the following command over the bus to initiate
calibration:
:CAL:PROT:INIT
4. Connect the 2k
Ω
(or closest available value) calibration
source to the front panel INPUT and SENSE jacks using
the 4-wire connections shown in Figure 2-1.
5. Send the following calibration command over the bus:
:CAL:PROT:DC:OHM2K 2E3
Be sure to substitute the exact calibration resistance value for
the 2E3 parameter in the above command. For example, if
the resistance value is 1.90034k
Ω
, the command would
appear as follows:
:CAL:PROT:DC:OHM2K 1.90034E3
6. Repeat steps 4 and 5 as desired for other calibration
points.
7. If desired, send the following commands to program the
calibration date and calibration due date:
:CAL:PROT:DATE <yr>,<mon>,<day>
:CAL:PROT:NDUE <yr>,<mon>,<day>
8. Send the following command to save calibration
constants:
:CAL:PROT:SAVE
9. Finally, send the following command to lock out
calibration:
:CAL:PROT:LOCK
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