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ADJUSTMENTS
519.
LOG AMPLIFIER LOG AND LINEAR ADJUSTMENT (SERIAL PREFIX 22O8A)
(Cont'd)
Set output level of signal generator for a digital voltmeter reading of
800
mV plus offset (algebraic sum)
f
lmY
Set Amplitude Scale to 10 dB/DIV and adjust A14R2 LOG LIN adjustment for a digital voltmeter reading
of
800
mV plus offset.
Repeat step
14
to recheck the log fidelity.
Set the
REF
LEVEL dBm control to
-
50.
Set
Amplitude Scale to 1 dB/DIV.
Set the step attenuator to 0 dB and set output level of signal generator for a digital voltmeter reading of
700
mV (do not include offset).
Set
the
REF
LEVEL dBm control to
-
90 and the step attenuator to
40
dB. Adjust A14R1, LOG GAIN
adjustment for a digital voltmeter reading of
700
mY
Change
REFERENCE
LEVEL and step attenuator settings as shown in Table
5
-
8.
Deviation from Refer-
ence should not exceed the given limits.
TABLE
5-8.
LOG GAIN ADJUSTMENT LIMITS
Return the TEST-NORM switch on assembly A12 to the NORM position.
Reference Level
(dBm)
-
50
-60
-
70
-
80
-
90
Step Attenuator
Setting (dB)
0
10
20
30
40
Deviation From
Reference
Reference
(700 mV)
k30 mV
+30 mV
+30
mV
*30 mV