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6. Video Processor Adjustments
6.
Set step attenuator to 120 dB. DVM indication should be 0.000
7.
Set step attenuator to 0 dB.
Key in [Reference
8.
close to + 1.000 fO.OO1 V dc as possible. (It may be necessary to
slightly adjust the front panel AMPTD CAL control to achieve
required tolerance.)
9.
Connect DVM to A4AlTP2.
Adjust A4AlR14 OS for a DVM indication of 0.000 f0.003 Vdc.
10.
See Figure 3-36 for
Figure 3-36. Location of Video Processor Adjustments
Connect the DVM to A4AlTP3.
11.
12.
Set the step attenuator to 120 dB.
Adjust A4AlR32 ZERO for a DVM indication of 0.000 rtO.001 Vdc.
13.
Set the step attenuator to 0 dB.
14.
Adjust A4AlR36 FS for DVM indication of +2.000 f 0.001 V dc.
15.
Repeat steps 12 through 15 until specifications of steps 13 and 15
16.
are met.
LOG Offset Adjust
17. Set step attenuator to 40 dB.
18. Key in Cm), (m)
]
L E V E L
19. Connect DVM to A4AlTPl. Record DVM indication. Indication
should be approximately +0.500 V dc.
20. Decrease reference level to -60 dBm using the step key.
21. Adjust A4AlR2 LG OS for DVM indication of +O.lOO +O.OOl V
dc greater than the DVM indication recorded in step 19. See
Figure 3-36 for location of adjustment.
and adjust DATA knob for DVM indication as
location of the adjustment.
the
LOG
(ENTER
-50 dBm.
F S
Z E R O
V de
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