TB 9-6625-2143-24
Table 5. Amplitude Display (Log Scale)
Synthesizer level
Test instrument indications
generator output
(dB)
dBm
Volts
Min
Max
-6.99
0.1
V
-18
-22
-16.99
31.6
mV
-28
-32
-26.99
10
mV
-38
-42
-36.99
3.16
mV
-48
-52
-46.99
1
mV
-58
-62
-56.99
0.316
mV
-68
-72
-66.99
0.1
mV
-78
-82
(9) Step synthesizer level generator to + 13.0 1 dBm out put.
(10) Set SCALE control to VOLTS and VERNIER (amplitude) control to CAL.
(11) Adjust FREQUENCY control for indication near 10,000 Hz and press AFC pushbutton.
(12) Adjust front panel CAL 10 kHz potentiometer for a full-scale meter indication.
(13) Adjust synthesizer level generator for +12-10 dBm (0.9 V rms) output. If TI
meter does not indicate between 0.88 and 0.92 V, perform b (1) through (39) below.
(14) Repeat technique of (13) above for outputs and indications listed in table 6. If
any indication listed is not within limits specified, perform b (1) through (39) below.
Table 6. Amplitude Display (Volts Scale)
Synthesizer level
Test instrument indications
generator output
(V)
Volts
Min
Max
dBm/50
+11.07
0.8
0.78
0.82
+9.91
0.7
0.68
0.72
+8.51
0.6
0.58
0.62
+6.99
0.5
0.48
0.52
+5.05
0.4
0.38
0.42
+2.55
0.3
0.28
0.32
-0.97
0.2
0.18
0.22
-6.99
0.1
0.08
0.12
b. Adjustments
(1) Perform meter mechanical zero adjustment on TI.
(2) Set POWER switch to off.
Place A4 board on two extender boards and set
POWER switch to on.
(3) Position controls as listed in (a) through (j) below:
SCALE VOLTS pushbutton pressed.
(a)
AFC pushbutton released.
(b)
AMPLITUDE REF LEVEL control to X 1.
(c)
Calibration switch to dBm 900 /LIN.
(d)
INPUT SENSITIVITY control to -20 dB.
(e)
VERNIER (amplitude) control to CAL.
(f)
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