TM 11-6625-3087-12
4. On Level Meter, enter minimum number of noise spikes to be counted as follows:
Press THSHLD (19).
Enter threshold level ( 16).
Press MEAS CONT(11).
NOTE
Do not change the units after threshold has been entered.
5. On Level Meter, select desired sideband CHANNEL (9).
6. Tune the Level Meter to the input signal frequency as follows:
If the carrier frequency is to be used to tune the Level Meter to a message channel, press CARRIER (6), FREQ (21),
and enter the carrier frequency.
If the tone frequency is to be used to tune the Level Meter to a message channel, press TONE (7), FREQ (21), and
enter the tone frequency.
7. If 1004Hz test tone is on message channel, fine tune Level Meter as follows:
Press NOISE/TONE (25).
Press COUNTER (10).
Press CNTR->FREQ (12).
Press IMPULSE (2).
8. On Level Meter, enter duration as follows:
If counting for a specific time limit, press TIME (17) and enter time in minutes, decimal point, and seconds. Press
MEAS CONT (11).
If counting is to be continuous, press TIME (17) and enter 1000000. Press MIN (14). Verify "CON" appears in
FREQUENCY/ENTRY display (8). Press MEAS CONT (11).
9. Press START (22).
10. MEASUREMENT/ENTRY display (5) indicates input signal power level. FREQUENCY/ENTRY display (8) indicates
time duration (left side) and number of impulse spikes (right side).
NOTE
Input signal modulation (AM or FM) may cause instability in either display.
11. If MEASUREMENT/ENTRY display is unstable or constantly resets full scale level,
Press ENTRY (1),
Press FULL SCALE (20), UP ARROW (15) or DOWN ARROW (13) then MEAS CONT (11) push buttons until
display is stable. Verify OVLD indicator (3) remains off.
NOTE
If OVLD indicator is on or "OL" appears in MEASUREMENT/ENTRY display, increase
full scale level. If "UL" appears in MEASUREMENT/ENTRY display, decrease full
scale level.
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