
6. Video Processor Adjustments
6. Set step attenuator to 120
dB.
DVM indication should be 0.0000
f0.0005 V dc. If DVM indication is out of tolerance, adjust
A4A2R79
ZERO
on
A4A2
Log Amplifier-Detector. See Figure 3-34
for the adjustment location.
7. Set the step attenuator to 0
dB.
8. Key in (REFERENCE LEVEL) and adjust DATA knob, and then the
front panel AMPTD CAL control, for DVM indication as close to
+ 1.000 fO.OO1 Vdc as possible.
9. Connect DVM to A4AlTP2.
10. Adjust A4AlR14 OS for a DVM indication of 0.000 ho.003 Vdc.
See Figure 3-36 for the location of the adjustment.
A4Al
Video Processor
R36
R32
FS ZERO
A4Al
Figure 3-36. Location of Video Processor Adjustments
11. Connect the DVM to A4AlTP3.
12. Set the step attenuator to 120
dB.
13. Adjust A4AlR32 ZERO for a DVM indication of 0.000 fO.OO1 Vdc.
14. Set the step attenuator to 0
dB.
15. Adjust A4AlR36 FS for DVM indication of +2.000
f
0.001 Vdc.
16. Repeat steps 12 through 15 until no further adjustments are
required.
LOG
Offset
Adjust
17. Set step attenuator to 40
dB.
18. Key in
m),
CATTEN]
I,
LOG [ENTER
dB/DwJ,
@iTiF]
[ENTER
dB/DIv)
q,
(REFERENCE LEVEL) -50
dBm.
19. Connect DVM to
A4AlTPl.
Record DVM indication. Indication
should be approximately
+0.500
Vdc.
Vdc
20. Decrease reference level to -60
dBm
using the step key.
21. Adjust A4AlR2 LG OS for DVM indication of
+O.lOO
fO.OO1
Vdc greater than the DVM indication recorded in step 19. See
Figure 3-36 for location of adjustment.
3-74
Adjustments
Commentaires sur ces manuels