TB 9-4931-540-24
16. Local Oscillator Sideband Accuracy
a. Performance Check
(1) Disconnect rear panel OVEN REF OUT from EXT REF IN.
input.
(2) Connect rear panel OVEN REF OUT to 50-75
(3) Press keys and enter values using ENTRY keys as listed in (a) through (c) below:
(a) ENTRY INSTR PRESET.
(b) ENTRY CENTER FREQUENCY to 10 MHz.
(c) MARKER/CONTINUOUS ENTRY COUNTER to on.
NOTE
Proceed when TI counter frequency indication is stable.
NOTE
60 Hz represents power line frequency; if power line frequency
is different than 60 Hz, use current power line frequency in
(4)(k) below.
(4) Press keys and enter values using ENTRY keys as listed in (a) through (m) below:
(a) ENTRY blue shift and then MARKER/CONTINUOUS ENTRY MKR OFS
STEP.
(b) SWEEP ENTRY MANUAL to 0 Hz.
(c) SWEEP ENTRY MANUAL and then ENTRY STEP .
(d) MARKER/CONTINUOUS ENTRY COUNTER to off.
(e) MARKER/CONTINUOUS ENTRY OFFSET to on.
(f) MARKER/CONTINUOUS ENTRY ENTER OFFSET.
(g) ENTRY REFERENCE LEVEL to -50 dBm.
(h) RBW-VBW-ST ENTRY RES BW to 3 Hz.
(i) RBW-VBW-ST ENTRY VIDEO BW to 1 Hz.
(j) ENTRY SAVE and then 1.
(k) ENTRY CF STEP SIZE to 60 Hz.
(l) SWEEP ENTRY MANUAL.
(m) ENTRY STEP .
(5) Average TI marker amplitude indication will be <-80 dB.
key. Average TI marker amplitude indication will
(6) Press ENTRY STEP
be <-80 dB.
(7) Repeat (6) above three times.
key six times. Average TI marker amplitude indication
(8) Press ENTRY STEP
will be <-80 dB.