
5. Log Amplifier Adjustments
20. Adjust
A4A2R61
ATTEN
for DVM indication of + 1.000 fO.OOO1 V
dc. See Figure 3-34 for location of adjustment. If unable to adjust
A4A2R61
ATTEN
for proper indication, increase or decrease value
of
A4A2R62.
(If
A4A2R61
is fully clockwise, increase the
value
of
A4A2R62.)
Refer to
‘Ihble
3-3 for range of values.
21. Repeat steps 17 through 20, until specifications of steps 18 and 20
are achieved without further adjustment. Because adjustments
A4A2R61
and
A4A2R91
are interactive, several iterations are
needed.
Linear
Gain
22. Press the LIN pushbutton. DVM indication at A4AlTPl should be
Adjustments
+ 1.000
f0.020
V dc
(+0.980
to + 1.020 V dc). If indication is
not within this range, repeat steps 14 through 21. If indication is
within this range, press
(ml
[ENTER dB/DIv]
q.
This disables the
IF step gains.
23. Decrease the frequency synthesizer output level 10
dB.
Press
(REFERENCE LEVEL) 0
dBm,
and adjust the frequency synthesizer
output level for a DVM indication of + 1.00 f.OO1 Vdc.
24. Verify that attenuator is set at 10
dB.
Decrease the frequency
synthesizer output level by 10
dB.
Press
(‘JEFERENCE
LEVEL) -60
dB.
25. Adjust
A4A3R83
LGlO
for DVM indication of + 1.000 fO.O1O V dc.
See Figure 3-34 location of adjustment. If unable to adjust
LGlO
for proper indication, increase or decrease
value
of
A4A3R54.
Refer to
‘Iable
3-3 for range of values.
26. Decrease the frequency synthesizer output level by 10
dB.
27. Key in (REFERENCE LEVEL) -70
dB.
28. Adjust
A4A2R14
LG20 for DVM indication of
+
1.000 fO.O1O
V dc. See Figure 3-34 for location of adjustment. If unable to
adjust LG20 for proper indication, increase or decrease value of
A4A2R18.
Refer to
Table
3-3 for range of values.
29. Press
(2-22)
to reenable the IF step gains.
3-72 Adjustments
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