TB 9-6625-1914-24
(f) SCAN WIDTH PER DIVISION switch to 0.5 MHz.
(g) INPUT ATTENUATION switch to 20 dB.
(2) Position TI controls as listed in (a) through (g) below:
(a) SCAN TIME PER DIVISION switch to 5 ms.
(b) BASE LINE CLIPPER control fully ccw.
(c) LOG/LINEAR switch to LOG (10 dB LOG on Model 8552B) (LINEAR for linear
circuit check).
(d) LOG REF LEVEL switch to -20 dBm.
(e) VIDEO FILTER switch to OFF.
(f) SCAN MODE switch to INT.
(g) SCAN TRIGGER switch to AUTO.
(3) Connect signal generator RF output to RF plug-in RF INPUT.
(4) Adjust signal generator for output of 30 MHz at -30 dBm.
(5) Adjust RF plug-in FREQUENCY control until signal is centered on display.
(6) Adjust LOG REF LEVEL (LINEAR SENSITIVITY vernier) vernier control for an
8.0 division signal amplitude on display.
(7) Change LOG REF LEVEL switch setting to reduce signal amplitude display by 10 dB.
Signal amplitude display will decrease to between 6.85 and 7.15 divisions.
(8) Repeat technique of (7) above for values listed in table 5. Signal display amplitude
will be within limits specified.
NOTE
To check operation of the LINEAR circuits, repeat paragraph
11 a (1) through (8) above.
Table 5. Amplitude Display Accuracy
Signal display amplitude
Change LOG REF LEVEL switch setting in (7)
(divisions of vertical deflection)
above by:
Min
Max
20 dB
5.85
6.15
30 dB
4.85
5.15
40 dB
3.85
4.15
50 dB
2.85
3.15
60 dB
1.85
2.15
70 dB
0.85
1.15
b. Adjustments. No adjustments can be made.
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