Keithley 486 Instruction Manual page 141

SECTION5
Pe-qhmmce verification
5.5.2 Voltage Source Verification
(Model 487)
Perform the following steps to verify the V-Source (volt-
age source) of the Model 487:
WARNING
The following procedure uses hazardous 7.
voltages that could cause severe injury or
8.
death. Exercise extreme caution when per-
9.
forming this procedure.
10.
1.
2.
3.
4.
Make sure the V-Source of the Model 487 is in
standby, then connect the Model 197 DMM to it as
shown in Figure 5-2.
Set the Model 197 DMM to the 2OOmV range, and
zero its display as follows:
A. Temporarily disconnect the test leads at the
Model 487 and short them together.
B. Allow the reading on the Model 197 to settle.
C. Press the REL. button to zero the Model 197.
D.
Reconnect the test leads to the Model 487 as
shown in Figure 5-2.
While in standby, set the V-Source level to OO.OOOV
on the 50V range.
Place the V-Source in operate and verify that the
reading on the Model 197 is within the following
limit
5.
6.
11.
12.
13.
14.
15.
16.
-4.ooomv to 4.ooOmv
Using the 4 key, set the V-Source to OOO.OOV on the
5CW range.
Verifythat thereadingontheModel197iswithinthe
following limit
4o.ooomv to 4o.ooomv
Place the V-Source in standby.
Set the Model 197 DMM to the 200V range.
Set the V-Source level to 5O.oOOV on the 50V range.
Place the V-Source in operate and verify that the
readingontheModel197is~~thefollawinglim-
its:
49.946v to 50.054v
Place the V-Source in standby.
Set the Model 197 to the 1OCOV range.
Set the V-Source level to 5OO.OOV.
Place the V-Source in operate and verify that the
readingontheModel197tswitbinthefollowinglim-
its:
499.21V to
500.79V
Place the Model 487 in standby.
Repeat the basic procedure in steps 8 through 15, but
set the V-Source for negative (-) voltages. The allow-
able readings will have a negative polarity.
5-4