TB 9-6625-2333-24
b. Adjustments. No adjustments can be made.
11. Input Attenuator Accuracy
a. Performance Check
(1) Connect equipment as shown in figure 1.
Figure 1. Input attenuator accuracy (50 MHz) - equipment setup.
(2) Press synthesizer/level generator keys to values as listed in (a) through
(c) below:
(a) FREQUENCY to 50 MHz.
(b) AMPLITUDE to -50 dBm.
(c) AMPTD INCR to 10 dB.
(3) Press TI keys and enter values using DATA keys as listed in (a) through (i) below:
INSTRUMENT STATE PRESET.
(a)
INSTRUMENT STATE CAL.
(b)
[REALIGN LO & IF] wait for ADJUST STATUS messages to disappear.
(c)
FREQUENCY then [CENTER FREQ] to 50 MHz.
(d)
SPAN then [ZERO SPAN].
(e)
AMPLITUDE then [REF LVL] to -70 dBm.
(f)
[LOG dB/DIV] to 1 dB.
(g)
CONTROL BW then [RES BW] to 3 kHz.
(h)
[VIDEO BW] to 1 Hz.
(i)
(4) Set attenuator to 0 dB.
(5) Adjust attenuator to position signal peak 2 to 3 divisions below TI reference level.
(6) Press TI keys as listed in (a) through (d) below: