Volts Calibration - Keithley 6512 Instruction Manual

Maintenance

7.4.12 Volts calibration

Calibration of the volts function should be performed in the
following order: 200mV, 2V, 20V, and 200V ranges. The
200V range will require that an external 190V source be ap-
plied to the Model 263.
Proceed as follows:
1. Connect the Model 263 to the Model 6512, as shown in
Figure 7-3.
2. Place the Model 6512 on the volts function, and select
the 200mV range.
3. Zero correct the Model 6512 by enabling zero check and
zero correct in that order.
4. Program the Model 263 to output 00.000mV, and release
zero check on the Model 6512.
5. Zero the display of the Model 6512 by pressing SUP-
PRESS.
6. Program the Model 263 to output 190.000mV.
7. Adjust the display of the Model 6512 to read 190.00mV
using the ADJUST buttons on the Model 6512.
8. Program the Model 263 to output 00.000mV by pressing
ZERO.
9. On the Model 6512, disable zero correct and suppress.
10. Using Table 7-4 as a guide, repeat steps 3 through 9 for
the 2V and 20V ranges.
Figure 7-4
Connections for external voltage source
7-6
DUAL BANANA CABLE
(MODEL CA-18-1)
CHASSIS
DC CALIBRATOR
11. With the Model 343A set to zero volts, connect it to the
Model 263, as shown in Figure 7-4. Leave the Model 263
connected to the Model 6512, as shown in Figure 7-3.
12. Select the 200V range and zero correct the Model 6512
by enabling zero check and zero correct in that order.
13. Set the Model 343A to output 190.000V to the Model 263.
14. Release zero check on the Model 6512, and program the
Model 263 to output the external voltage source by
pressing SHIFT VOLTS.
15. Adjust the display of the Model 6512 to read 190.00V
using the ADJUST buttons of the Model 6512.
16. Place the Model 263 and the Model 343A in standby.
17. On the Model 6512, disable zero correct.
18. Turn off the Model 343A, and disconnect it from the
Model 263.
Table 7-4
Model 6512 volts calibration
6512 263 output
range voltage
200mV 190.000mV
2V 1.90000V
20V 19.0000V
200V EXT VOLTS
EXT INPUT
COMMON
LO HI
MODEL 263
External DC
calibrator 6512
voltage reading
— 190.00mV
— 1.9000V
— 19.000V
190.000V 190.00V