TB 9-6625-2143-24
SCALE LOG l0 dB pushbutton pressed.
(a)
AFC pushbutton released.
(b)
AMPLITUDE REF LEVEL control to 0 dB (NORMAL).
(c)
Calibration switch to dBm 900 .
(d)
INPUT SENSITIVITY control to 0 dB.
(e)
INPUT SENSITIVITY vernier (amplitude) to midrange.
(f)
INPUT MODE switch to UNBAL.
(g)
RESOLUTION BANDWIDTH control to 3 Hz.
(h)
DISPLAY SMOOTHING control to MIN.
(i)
FREQ SPAN control to 50 Hz.
(j)
SWEEP MODE control to MAN.
(k)
MANUAL VERNIER control fully ccw.
(l)
OUTPUT MODE switch (rear panel) to TRACKING OSC.
(m)
LEVEL control (rear panel) fully cw.
(n)
(2) Disconnect function/arbitrary generator from TI.
(3) Adjust FREQUENCY control until TI display indicates 1000 Hz.
(4) Rotate MANUAL VERNIER control fully cw. If TI display does not indicate
between 1049 and 1051 Hz, perform b (l) through (12) below.
(5) Repeat technique of (4) above for settings and indications listed in table 4.
Table 4. Frequency Span
Test instrument
FREQ SPAN
Display
control settings
indications
Min
Max
100
Hz
1098
1102
200
Hz
1196
1204
500
Hz
1490
1510
1
kHz
1980
2020
2
kHz
2960
3040
5
kHz
5900
6100
10
kHz
10,800
11,200
20
kHz
20,600
21,400
50
kHz
50,000
52,000
b. Adjustments
(1) Set RESOLUTION BANDWIDTH control to 300 Hz, FREQ SPAN control to 0
Hz, SWEEP MODE control to RESET, and MANUAL VERNIER control fully ccw.
(2) Remove card nest cover to gain access to board A2.
(3) Short red lead at A2TP2 (RED) (fig. 1) to chassis ground.
(4) Adjust A2L3 (fig. 1) for 0 to 5 Hz indication on TI display. Remove short from
A2TP2 (RED). (R)
(5) Adjust FREQUENCY control for 10 Hz indication on TI display.
7