TB 9-6625-1914-24
b. Adjustments. No adjustments can be made.
29. Average Noise Level (Sensitivity)
a. Performance Check
(1) Position TI controls as listed in (a) through (d) below.
(a) FREQUENCY control to 1250 MHz.
(b) BANDWIDTH switch to 10 kHz.
(c) SCAN WIDTH (red) switch to ZERO.
(d) INPUT ATTENUATION switch to 0 dB.
(2) Position IF plug-in controls as listed in (a) through (h) below:
(a) BASE LINE CLIPPER control fully ccw.
(b) SCAN TIME PER DIVISION switch to 50 ms.
(c) LOG/LINEAR switch to LOG (10 dB LOG on model 8552B).
(d) LOG REF LEVEL switch to -60 dBm.
(e) LOG REF LEVEL (LINEAR SENSITIVITY vernier) vernier control to 0.
(f) VIDEO FILTER switch to 100 Hz.
(g) SCAN MODE switch to INT.
(h) SCAN TRIGGER switch to AUTO.
(3) Vary FREQUENCY control from 1250 MHz to 100 kHz while observing average
noise level on display. Average noise level will be below -102 dBm graticule line (-42 dB LOG dB
line added to the -60 dBm LOG REF LEVEL switch setting).
b. Adjustments. No adjustments can be made.
30. Spurious Response
a. Performance Check
(1) Position TI controls as listed in (a) through (d) below:
(a) FREQUENCY control to 10 MHz.
(b) BANDWIDTH switch to 1 kHz