Keithley 6517 Service Manual page 47

Step 5: Amps Calibration
Perform the following steps to calibrate the amps function.
Table 2-11 and Table 2-12 summarize these steps.
1. Connect the triax shielding cap to the INPUT jack.
2. Send the following commands to the instrument:
:CAL:PROT:AZERO20P
:CAL:PROT:AZERO200P
:CAL:PROT:AZERO2N
:CAL:PROT:AZERO20N
:CAL:PROT:AZERO200N
:CAL:PROT:AZERO2U
:CAL:PROT:AZERO20U
:CAL:PROT:AZERO200U
:CAL:PROT:AZERO2M
:CAL:PROT:AZERO20M
3. Connect the Model 5156 Calibration Standard and the
DC voltage calibrator to the Model 6517A INPUT jack
(see Figure 2-3). Initially, make connections to the
100GΩ resistance in the standards box.
4. Set the DC voltage calibrator to exactly +1.900000V
DC, then send the following command to the
instrument:
:CAL:PROT:A20PCARD 1.9
5. Set the DC voltage calibrator output to -1.900000V DC,
then send the following command to the unit:
:CAL:PROT:AN20PCARD -1.9
6. Repeat steps 4 and 5 for the 200pA through 2µA ranges
using the calibration values summarized in Table 2-11.
For each step, be sure to connect the appropriate resis-
tance, set the DC calibrator voltage as required, and use
the correct command.
7. Disconnect the calibration standard and voltage calibra-
tor, and connect the traix cap to the INPUT jack.
8. Send the following command:
:CAL:PROT:AZERO20U
:CAL:PROT:AZERO200U
:CAL:PORT:AZERO2M
:CAL:PROT:AZERO20M
9. Connect the DC current calibrator to the INPUT jack.
10. Set the DC current calibrator output to +19.00000µA,
then send the following command:
:CAL:PROT:A20U 19E-6
11. Set the DC current calibrator output to -19.00000µA,
then send the following command:
:CAL:PROT:AN20U -19E-6
12. Repeat steps 10 and 11 for the 200µA through 20mA
ranges using the calibration currents and commands
summarized in Table 2-12.
Calibration
2-17