Keithley 486 Instruction Manual page 162

SECTION 7
Maintenance
9.
press MENU to calibrate OV on the 50V range. The
instnunent will then source 50V (nominal) and dis-
play the following message:
SET POS FS
(Set positive full scale)
10. Adjust the V-Source output of the Model 487 to
measure +5O.OOOV on the Model 197.
NOTE
If the output cannot be adjusted high enough
to measure 5O.OOOV on the Model 197, set the
V-Source to its maximum output setting
(50.5OOV displayed on the Model 487).
11. Press MENLJ to calibrate the 50V range at full scale.
The in&ument will exit the calibration
mode.
12. IftheModel197isnotreading+50.000V,repeatsteps
5 through 11. Otherwise, proceed to the next step.
13. Set the V-Source to output OOO.OOV on the 500V
range.
14. Press and release MENU until the following
mes-
sage is displayed:
CALVSRC
NO
15. Use the rotary knob to display the following mes-
sage:
CALVSRC YES
16. Press MENU. The following message will be dis-
played:
SET ZERO
17. Adjust the V-Source output of the Model 487 to
measure
(as close as possible) OO.OOOmV on the
Model 197.
18. Press MENU to calibrate OV on the 500V range. The
instrument will then source 500V (nominal) and dis-
play the following message:
SET POS FS
19. Adjust the V-Source output of the Model 487 to
measure +5OO.OOV on the Model 197.
NOTE
If the output cannot be adjusted high enough
to measure 5OO.OOV on the Model 197, set the
V-Source to its maximum output setting
(505.OOV displayed on the Model 487).
20. Press MENU to calibrate the 500V range at full scale.
The instrument will exit the calibration mode.
21. If theMode 197is not reading +5OO.OOV, repeat step
13 through 20.
22. Place the V-Source of the Model 487 in standby.
1
.._A_. I"_
'igure 7-3.
Setup
for Voltage Source CaJibration (Model 487)
7-5