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SERVICE INFORMATION
2!Y
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4
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5
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Table 4-1. Recommended
Verification
Equipment
Description
Application
Model 617 Electrometer
Model 196 6% Digit DMM
Model 707 Switching
Matrix
IBM PC or HP 200 or 300 computer
Model 707WKX-10 trim cables*
Model 7CVWRX-3 triax cables
Model 6172 2-slot male to 3-lug female
triaxial adapter
Model 7078-TRX-T trim tee adapter
Banana plugs (part #B6-10-2)
Relay test terminal
block*
Offset current; path isolation
Path resistance
All tests
Relay test
Offset current;
path resistance
Path isolation,
offset current
Offset current
Path resistance
Path isolation
and resistance
Relay test
*These items are used to construct
special cables; see text.
4.3.3 Relay Testing
The relays on Model 7072 can be tested using the test soft-
ware supplied with the Model 7G7 Switching
Matrix. The
-
following
paragraphs discuss the test equipment
and con-
nections. For detailed information
on using the test soft-
ware, consult
Section 6 of the Model
707 Instruction
Manual.
Recommended
Equipment
l
Model 707 Switchim
Matrix
l
Unterminated
3-slot &ax cables (2), made by cutting one
TRX-7078-10 cable in half
l
Relay test software (supplied
with Model 707)
l
IBM PC compatible or Hewlett Packard Series 200 or 300
computer
l
Relay test connector (supplied
with Model 707)
Connections
The test cable should be prepared using the information
shown in Figure 4-l. The center conductor
of the unter-
minated end of one trim cable should be connected to pin
1 of the relay test connector, while the inner shield should
be connected to pin 2. The outer shield should be cut off
and be left floating
at the test connector end.
Terniinal Block
"'-..
Cables
To Row A
Figure 4-1. Test Cable Preparation
The remaining
triax cable should be connected as follows:
connect the center conductor to pin 6, and connect the in-
ner shield to pin 5. Again, the outer shield should be left
floating.
Also, jumper pins 5 and 6 of the relay test con-
nector together.
Figure 4-2 shows how to connect the prepared test cable
to the Model 7072. Connect the first triax cable to row A
of the card, and connect the second triax cable to row B.
Also be sure to connect the test connector to the RELAY
TEST jack on the rear panel of the Model 707.
4-2
I
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