TM 11-6625-2781-14&P-2
Section IV
PERFORMANCE TESTS (cont'd)
4-24. Scan Width Accuracy (cont'd)
Set controls as follows:
ANALYZER:
BANDWIDTH ................................ ................................ ................................ ................................ ................... 3 kHz
SCAN TIME PER DIVISION ................................ ................................ ................................ ...... 10 MILLISECONDS
SCAN WIDTH PER DIVISION ................................ ................................ ................................ ...................... 05 MHz
200CD
RANGE................................ ................................ ................................ ................................ ............................... X1K
FREQUENCY ................................ ................................ ................................ ................................ ................ 50 kHz
AMPLITUDE ................................ ................................ ................................ ................................ ................ 3 o'clock
8406A
COMB FREQUENCY - MC ................................ ................................ ................................ .............................. 10 Mc
5.
Maximize the comb signal amplitudes using the comb generator and audio oscillator output amplitude controls.
6.
With controls set as in step 4 above, a comb signal occurs every 50 kHz on the display. Turn FINE TUNE to line up
a comb signal with the far left graticule line.
7.
Measure the amount of error, in divisions, that the comb signal deviates from the +3 graticule line. The comb signal
should occur on the +3 line +0.8 divisions.
+2.2
+3.8 (on display)
8.
To test the 20 kHz SCAN WIDTH PER DIVISION, set test equipment as follows:
ANALYZER:
BANDWIDTH ................................ ................................ ................................ ................................ ................... 3 kHz
SCAN TIME PER DIVISION ................................ ................................ ................................ ........ 5 MILLISECONDS
SCAN WIDTH PER DIVISION ................................ ................................ ................................ ....................... 20 kHz
8406A:
COMB FREQUENCY - MC ................................ ................................ ................................ .............................. 10 Mc
200CD
RANGE................................ ................................ ................................ ................................ ............................... X1K
FREQUENCY ................................ ................................ ................................ ................................ ................ 20 kHz
AMPLITUDE ................................ ................................ ................................ ................................ ................ 3 o'clock
9.
With the control settings as in Step 8 above, a comb signal occurs every 20 kHz on the display. Turn FINE TUNE
to line up a comb signal with the far left graticule line.
10. Measure the amount of error, in divisions, that the comb signal deviates from the +3 graticule line. The comb signal
should occur on the +3 line +0.24 divisions.
+2.76
+3.24 (on display)
4-10
