TB 9-4931-540-24
(53) Press SWEEP ENTRY MANUAL key and then ENTRY STEP
key twice. TI
marker amplitude indication will be <-70 dBm.
(54) Disconnect oscillator from TI and 50
feedthrough termination.
b. Adjustments. Refer to paragraph 6 d.
18. Bandwidth
a. Performance Check
to TI 50-75
(1) Connect synthesizer/level generator OUTPUT 50
input.
(2) Set synthesizer/level generator for a 10 MHz, -25 dBm output.
(3) Press keys and enter values using ENTRY keys as listed in (a) through (f) below:
(a) ENTRY INSTR PRESET.
(b) ENTRY CENTER FREQUENCY to 10 MHz.
(c) ENTRY REFERENCE LEVEL to -24.5 dBm.
(d) ENTRY dB/DIV to 1 dB.
(e) RBW-VBW-ST RES BW HOLD to on.
(f) INPUT AUTORANGE to off.
(4) Press keys and enter values using ENTRY keys as listed in (a) through (c) below:
(a) RBW-VBW-ST ENTRY RES BW to 3 Hz.
(b) ENTRY FREQUENCY SPAN to 10 Hz.
(c) RBW-VBW-ST ENTRY SWEEP TIME to 15 sec.
(5) Allow one complete sweep to occur.
(6) Adjust MARKER/CONTINUOUS ENTRY knob to move marker to the most
positive point on trace using marker amplitude indication.
(7) Press MARKER/CONTINUOUS ENTRY OFFSET key to on and then press
MARKER/CONTINUOUS ENTRY ENTER OFFSET key.
(8) Adjust MARKER/CONTINUOUS ENTRY knob to move marker down the left
side of trace until marker amplitude indication is between 2.97 and -3.03 dB.
(9) Press MARKER/CONTINUOUS ENTRY ENTER OFFSET key.
(10) Adjust MARKER/CONTINUOUS ENTRY knob to move marker to the right
side of trace until marker amplitude indication is between 0.03 and -0.03 dB.
(11) TI marker offset frequency indication will be within limits specified in table 10.
Record TI actual marker offset frequency indication in table 10.
(12) Press MARKER/CONTINUOUS ENTRY OFFSET key to off.
(13) Repeat (4) through (12) above for remaining TI settings and indications listed in