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6-13. Adaptive Coupler Test
-,
This test checks the circuits in the signal path shown in Figure 6-S. If the previous tests have
V been performed successfully, the only circuits being tested are the Adaptive Coupler, and
FET switches S8, LI, and L2. The signal must also pass through a Switchable Lowpass Filter
and an Output Buffer, but the filter states are not tested at this time. The -hp- 332SA opt 001
is connected to thelMOMHz Input to provide 500 termination, (the synthesizer is set to 0
volts at 0 Hz.) The Channel B output of the Low Frequency board is measured with an -hp-
34S5A voltmeter. The program puts the Adaptive Coupler into its AC mode (L2=1). The
DC offset of the Adaptive Coupler is then adjusted using A3R304. If the adjustment can be
made, the test passes and the results are printed.
Inltiafizhig the Test
With the High Frequency Menu displayed, press SFK KS to initialize the test. After in
itialization, follow the instructions displayed on the computer.
What H tha Test Fails?
Assuming that the previous tests have passed, and that the equipment is properly connected,
one of the switches (S8, LI, or L3), the Lowpass Filter, or the Adaptive Coupler is probably
at fault. Refer to Service Group One for schematics, component locators, and circuit
descriptions. If S8 is suspected, refer to service Group 3. The "SWITCH" subprogram can
facilitate finding the cause of the failure.
(
Setup
OUTPUT!
J-l
o
35801
O O
/
OUT
TO 3582 8
500 TE
PUT
CHAN
RMINATtON
3455
1
1
« L
O
rlo
» ! ! - 001= ■*■* ^W
|™<.«.I tern ,t»j P M J .
TLIE r
ECIOTI .M* ' i i m l — * «
~^%t-*
J
Figure 6-5. Adaptive Coupler Test
Adaptive Coupler Test
6-15/6-16
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