TB 9-6625-2127-35
(a) For 15 kHz FLAT switch position,
12.
Bridging Loss
perform b(1) through (7) below.
(b) For C-MSG switch position,
a.
Performance Check
perform b(2) through (5) and (8) through (11) below.
(c) For PROG switch position,
(1) Set INPUT switch to TMS-BRDG.
perform b(2) through (5) and (12) below.
(2) Connect all equipment except TI
shown in figure 3.
b.
Adjustments
(3) Adjust resistance standard No. 1 (A2)
(1) Set NOISE WTG switch to 3 kHz
to 600 ohms and resistance standard No. 2 (A2) to 0
FLAT.
ohms.
(2) Disconnect cable (B4) from test
(4) Adjust test oscillator (A3) frequency
oscillator and connect frequency counter (A1) to test
for 1 kHz and output for a 0-dBm indication on true rms
oscillator, using additional cable (B4).
voltmeter (A4).
(3) Adjust test oscillator frequency for a
(5) Connect TI to equipment setup. True
1.000-kHz indication on frequency counter.
rms voltmeter will indicate 0 0.3 dBm.
(4) Disconnect frequency counter from
(6) Disconnect TI from equipment setup.
test oscillator and reconnect cable to test oscillator.
(7) Press CARRIER 600 BAL pushbutton.
(5) Adjust test oscillator output for a 0-
(8) Adjust test oscillator frequency 10 kHz
dBm indication on true rms voltmeter.
and output for a 0-dBm indication on true rms voltmeter.
(6) Adjust A4R3C (fig. 2) until TI meter
(9) Reconnect TI to equipment setup.
indicates 0 dBm (R).
True rms voltmeter will indicate 0 +0.5 dBm.
(7) Set NOISE WTG switch to 15 kHz
(10) Disconnect TI from equipment setup.
FLAT. If TI meter does not indicate 0 dBm, readjust
(11) Set
true
rms
voltmeter
dBm
A4R3C to split the difference between this indication
REFERENCE switch to 900 ohms.
and 0 dBm.
(12) Adjust resistance standard No. 1 to
(8) Adjust A4R3A (fig. 2) until TI meter
900 ohms and No. 2 to 300 ohms.
indicates 0 dBm (R).
(13) Adjust test oscillator frequency 10 kHz
(9) Repeat b(2) through (5) above, using
and output for a 0-dBm indication on true rms voltmeter.
3.00 kHz.
(14) Press VF/Nm 900 BAL pushbutton and
(10) Adjust A4R3D (fig. 2) until TI meter
connect TI to equipment setup. True rms voltmeter will
indicates -2.15 dBm (R).
indicate 0 3 dBm.
(11) Repeat b(2) through (5) and (8)
through (10) above until TI meter indicates within
b.
Adjustments.
No adjustments can be
tolerance.
made.
(12) Adjust A4R3B (fig. 2) until TI meter
indicates 0 dBm (R).
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