TB 9-6625-2235-24
(38) Repeat (17) through (37) above until 190.0, 200, and 1500 MHz readout
indications are within specified limits on FREQUENCY MHZ readout.
11. Resolution Bandwidth Accuracy
a. Performance Check
(1) Position controls as listed in (a) through (h) below:
(a) TUNING control to 10 MHz.
(b) FREQ SPAN/DIV switch to 0.
(c) RESOLUTION BW switch to 3 MHz.
(d) INPUT ATTEN switch to 20 dB (OPTIMUM INPUT switch to -20 dBm).
(e) REFERENCE LEVEL switch to 0 dBm.
(f) LIN pushbutton pressed in.
(g) SWEEP TIME/DIV switch to 5 Ms.
(h) SWEEP TRIGGER switch to FREE RUN.
(2) Connect synthesizer/level generator 50Ω output to TI INPUT 50Ω.
(3) Adjust synthesizer/level generator frequency to 10 MHz and output amplitude
power level to 0 dBm.
(4) Adjust TUNING control to center 10 MHz signal peak on crt. (Reduce
synthesizer/level generator output amplitude, if necessary.
(5) Adjust synthesizer/level generator output amplitude control to position trace 7.1
divisions above graticule baseline.
(6) Increase synthesizer/level generator frequency until trace drops to 5 divisions
above graticule baseline and record synthesizer/level generator frequency.
(7) Adjust synthesizer/level generator frequency in direction opposite to that in (6)
above until trace peaks (7.1 divisions above graticule baseline) and then drops to 5 divisions
above graticule baseline. Record synthesizer/level generator frequency.
(8) Subtract frequency recorded in (7) above from frequency recorded in (6) above. If
difference is not between 2.40 and 3.60 MHz, perform b below.
(9) Set RESOLUTION BW switch to 1 MHz and repeat (3) through (8) above. If
difference is not between 800 and 1200 kHz, perform b below.