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Calibration
2-19
Procedure
1. Connect the Model 2001 to the IEEE-488 bus of the
computer using a shielded IEEE-488 cable such as the
Keithley Model 7007.
2. Make sure the primary address of the Model 2001 is the
same as the address specified in the program you will be
using to send commands (see paragraph 2.6.3).
3. Turn off the power if the instrument is presently turned
on.
4. Press and hold the recessed CAL switch while turning
on the power. The instrument will display the following
message to indicate it is ready for the low-level calibra-
tion procedure:
MANUFACTURING CAL
5. Allow the Model 2001 to warm up for at least one hour
before performing calibration.
6. Connect the Model 8610 low-thermal short to the instru-
ment INPUT and SENSE terminals, as shown in Figure
2-1. Wait three minutes before proceeding to allow for
thermal equilibrium.
NOTE
Be sure to properly connect HI, LO, and
SENSE terminals. Keep drafts away from
low-thermal connections to avoid thermal
drift, which could affect calibration accu-
racy.
7. Send the following command over the bus:
:CAL:PROT:DC:ZERO
Wait until the Model 2001 finishes this calibration step
before proceeding. (You can use the *OPC or *OPC?
commands to determine when calibration steps end, as
discussed in paragraph 3.6.)
8. Disconnect the low-thermal short, and connect the DC
calibrator to the INPUT jacks, as shown in Figure 2-2.
9. Set the DC calibrator output to +2.00000V, and turn ex-
ternal sense off. Send the following command to the
Model 2001 over the IEEE-488 bus:
:CAL:PROT:DC:LOW 2.0
(Be sure to use the exact calibration value if you are us-
ing a voltage other than 2V. The allowable range is
0.98V to 2.1V).
NOTE
For best results, use the calibration values
given in this part of the procedure whenev-
er possible.
Wait until the Model 2001 finishes this step before going
on.
10. Set the DC calibrator output to +20.00000V. 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.) Wait until the
Model 2001 finishes this step before going on.
11. Set the calibrator output to 19.0000k¾, and turn external
sense on. 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
Wait until the Model 2001 finishes the 20k¾ calibration
step before continuing.
NOTE
If your calibrator can source 20k¾, use
that value instead of the 19k¾ value used
here.
12. Set the calibrator output to 1.0000M¾, and turn external
sense off. 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
Wait until the Model 2001 finishes 1M¾ calibration be-
fore continuing.
13. Disconnect all test leads from the INPUT and SENSE
jacks. Send the following command to the instrument:
:CAL:PROT:DC:OPEN
Wait until the open-circuit calibration is complete be-
fore going on to the next step.
14. To program the Model 2001 to calculate new calibration
constants, send the following command over the bus:
:CAL:PROT:DC:CALC
15. Check for DC calibration errors by sending the follow-
ing query:
:SYST:ERR?