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SERVICE INFORMATION
Connect Cable
6172 Z-Slot10 -
Procedure
7072 Matrix
Card
Figure 4-3. Offset Verification
Test Connections
NOTE
The following
procedure should be performed
at
an ambient temperature
of 23°C and at a relative
humidity
of less than 60%.
1. Turn on the Model 617 power and allow it to warm up
for
two
hours
before
beginning
the verification
procedure.
2. With the power off, install the Model 7D7+2 in the desired
slot of the Model 707 Switching
Matrix.
Remove all
other cards from the instrument,
and install the slot
covers.
3. After the prescribed warm up period, select the amps
function and the 2pA range on the Model 637. Zero cor-
rect the instrument,
and then select autoranging.
4. Connect the Model 617 to row A of the Model 7072,
as shown in Figure 4-3.
5. Close crosspoint Al by using the Model 707 front panel
controls.
6. Disable zero check on the Model 617, and allow the
reading to settle.
7, Verify that the offset current reading is <lpA.
8. Enable zero check on the Model 617, and open cross-
point Al.
9. Repeat steps 5 through
8 for crosspoints
A2 through
Al2. Only one crosspoint at a time should be closed.
10. Disconnect
the triax-cable
from row A, and connect
it instead to row B.
11. Repeat steps 5 through
8 for crosspoints
Bl through
812. Only one crosspoint at a time should be closed.
12. With zero check enabled, disconnect the electrometer
from row B, and connect it to row C.
4-4
I
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