TB 9-4931-488-35
Table 26. Demodulated Output Accuracy (A26A8S1 set to
DC)
Computed results (%)
indications
(V Ac)
Min
Max
0.200
19.6
20.4
0.300
29.4
30.6
0.400
39.2
40.8
0.500
49.0
51.0
0.600
58.8
61.2
0.700
68.6
71.4
0.800
78.4
81.6
b. Adjustments
NOTE
Disconnect all equipment before proceeding.
(1) Position controls as listed in (a) through (i) below.
(a)
LEVEL VOLTS pushbutton pressed.
(b)
AM switch to OFF.
(c)
RANGE MHz switch to 256-128.
(d)
FREQUENCY TUNE control for a
FREQUENCY MHz display indication of
190 MHz.
(e) AM control to midrange.
(f) OUTPUT LEVEL 10 dB switch to 0 dBm.
(g) OUTPUT LEVEL 1 dB switch to 0 dB.
(h) OUTPUT LEVEL vernier control to CAL.
(i) RF OFF/ON switch to OFF.
(2) Connect A26A8TP2 (fig. 2) to chassis ground. Set A26A8S1 switch (fig. 2) to AC.
(3) Connect multimeter to A26A8TP1 (fig. 2) and chassis ground. Adjust A26A8R3
(fig. 2) for a
0.000 0.001 V dc
multimeter indication (R).
(4) Set A26A8S1 switch (fig. 2) to DC. Disconnect multimeter from A26A8TP1 (fig.
2) and
connect to
A26A8TP3 (fig. 2). Adjust A26A8Rl5 (fig. 2)
for a
0.000 0.001 V dc
(5) Disconnect ground from A26A8TP2 (fig. 2). Disconnect multimeter from
A26A8TP3 (fig. 2). Set multimeter to measure AC voltage and connect to AM IN A26A2TP1
(6) Connect audio analyzer OUTPUT HI to TI AM input. Adjust audio analyzer
controls for a 100 Hz output signal and adjust amplitude controls for a 0..52-V ac output
level.
(7) Set RF OFF/ON switch to ON and AM switch to DC. Adjust AM control for a
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