Keithley 486 Instruction Manual page 161

SECTION 7
Maintenance
Model 6171 s-&t
to Z-lug triax
adapter
I
Mcdel7024-3
J T'iaa cabk
Guard
Disabled
?,qure 7-2.
Setup for Picoammeter Calibration
Yodel 263
(V/R Amps)
Voltage Source Calibration (Model 487)
In general, the voltage source of the M In general, the voltage source of the Model 487 is cali-
brated by adjusting the output until OV 4 brated by adjusting the output until OV and full scale are
measuredbyaDMMandtheperformir measured byaDMMandthenperformingthecalibration
_^__'z_^
routine.
2. Make sure the V-Source (voltage source) of the
Model 487 is in standbv. then connect the Model 197
DMM to it as shown i &ure 7-3.
3. While in standby, set the V-Source to the 50V range.
Note:KeeppressingandreleasingtheFkeyuntilthe
50V range is displayed (i.e. "OO.OOOV" is OV on the
50V *axwe).
Perform the following steps to calibrate the V-Source of
the Model 487:
4. Place thz G-Source in operate.
5. Press and release MENU until the following mes-
sage is displayed:
CALVSRC
NO
6. Use the rotary knob to display the following mes-
SClge:
WARNING
The following procedure uses hazardous
voltages that could cause severe injury or
death. Exercise extreme caution when per-
forming this procedure.
CALVSRC YET
7. Press MENU. The following
message
wiU be dis-
played:
SET ZERO
1. Zero the 200mV range of the Model
197
DMM and
8. Adjust the V-Source output of the Model 487 to
select autorange.
measure (as close as possible) OO.OOOmV on the
Model 197.
7-4