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This test checks the circuits in the signal path shown in Figure 6-9. If the previous tests have
been performed, the only circuit that has not been checked is the signal path from the Noise
Input to the Summing Junction. A signal is input to the Noise Input from an -hp- 3325 A opt
001 and the signal is measured with anjnp- 34SSA voltmeter at the 1MQ OUTPUT to 3585A.
The program gives the user the dptibTTof ajsc^ntmuirig the test if the test appears to'be fail-'
ing. The program then prints the results.
With the High Frequency Menu displayed, press SFK K9 to initialize the test. After in
itialization, follow the instructions displayed on the computer.
What if the Test Fails?
Assuming that the previous tests h?ve passed, the only probable cause of failure is the switch
SI. This can easily be checked using "SWITCH" and a voltmeter. Refer to Service Group
Three for schematics and component locators.
Equipment Set Up
O
3S601
O O
INPUT
INPUT
FROM 3582
NOISE SOURCE
Figure 6-9. Noise Input to Summing Junction Test
Noise Input to Summing Junction Test
6-23/6-24.
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