TB 9-6625-2151-35
Test instrument
Left display indications
Left display indications
Calibrator
for +12 dBm
for-40 dBm
Right display
(dBm)
(dBm)
indications
50
Hz
11.5 to 12.4
-40.5 to -39.6
49
to 51
Hz
200
Hz
11.8 to 12.1
-40.2 to -39.9
199
to 201
Hz
500
Hz
11.8 to 12.1
-40.2 to -39.9
499
to 501
Hz
1.0 kHz
11.9 to 12.0
-40.2 to -39.9
999
to 1001
Hz
15
kHz
11.8 to 12.1
-40.2 to -39.9
14.99 to 15.01 kHz
50
kHz
11.5 to 12.4
-40.5 to -39.6
49.99 to 50.1 kHz
85
kHz
11.5 to 12.4
---
84.99 to
85.01 kHz
(5) Set calibrator for a -40.05 dBm, 20 Hz output. If TI left display does not indicate
between -41.0 and -39.1 dBm, perform b below. TI right display will indicate between 19
and 21 Hz.
(6) Repeat technique of (5) above at calibrator frequency settings listed in table 3. If
TI indications are not within limits specified for -40 dBm, perform b below.
b. Adjustments
(1) Press calibrator RESET key and disconnect from TI.
(2) Connect left TRMT/RCV 310 to right RCV/TRMT 310 using a T-type
connector.
(3) Connect multimeter Input HI and LO to T-type connector.
(4) Press IMPULSE NOISE DISPLAY F2 1004 key. Right display will indicate
1004 Hz.
(5) Adjust OUTPUT LEVEL control until multimeter indicates about 1.0 V ac.
Record exact value.
(6) Connect multimeter Input HI to TP13 (fig. 1) and LO to ground. Adjust R77
(fig. 1) until
multimeter indicates value recorded in
(5) above (R).
(7) Disconnect left TRMT/RCV 310 from right RCV/TRMT 310.
(8) Press MEASUREMENT MEAS key to select NOISE and DISPLAY key to
select TRMT. Connect jumpers from TP10 to TP21 and from TP22 to TP23 (fig. 1).
(9) Connect multimeter Input HI to TP24 (fig. 1). If multimeter does not
indicate 0 V dc 0.3 mV dc, adjust R33 OFFSET (fig. 1) for 0 V dc. Disconnect jumpers and
multimeter (R).
(10) Set calibrator for a .77 V, 1.004 kHz output. Do not connect to TI at this time.
(11) Press DISPLAY key to select RCV and MEASUREMENT MEAS key to select
(12) Press NOR and SET UP RCV 600 Ω pushbuttons.
(13) Release SET UP RCV BRG, RCV HOLD, TRMT DIAL, and TRMT HOLD
pushbuttons (out).
6