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4-3
Figure 4-1
Connections for insertion loss tests
IN1
IN2
IN3
IN4
OUTA
IN5
IN6
IN7
IN8
OUTB
IN9
IN10
IN11
IN12
OUTC
75
Ω
Cables
Model 7038
Network Analyzer
OUTPUT INPUT
4. Select the Model 6517A ohms function, choose the
200M
Ω
range, and make certain zero check is disabled.
5. Close channel 1 on the Model 7038.
6. Program the Model 6517A voltage source for 20V, and
make sure the internal voltage source connection mode
is selected.
7. Turn on the Model 6517A voltage source, and allow the
reading to settle.
8. Verify that the Model 6517A resistance reading is
>100M
Ω
.
9. Turn off the voltage source, and open channel 1.
10. Repeat the procedure for channels 2 through 4, measur-
ing the resistance between the center conductor of each
channel and the center conductors of all other channels
of multiplexer A. For each test:
• Connect the electrometer to the center conductors of the
two channels being tested.
• Close only one of the channels being tested.
11. Repeat the entire procedure to test channel isolation be-
tween all multiplexer B channels (5-8) and multiplexer
C channels (9-12).
Содержание 7038
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