TB 9-6625-2250-24
(t) [SINGLE] wait for completion of sweep.
(u) MARKER PEAK SEARCH.
(v) [MARKER DELTA].
MKR indication between -0.9 and -1.1 dB and press
(4) Adjust TI knob ccw for a
[MARKER DELTA] key.
MKR indication between -3.9 and -4.1 dB.
(5) Adjust TI knob ccw for a
(6) Divide MKR frequency (in Hz) by
MKR amplitude (in dB) to obtain slope of
[RES BW] filter and record result.
MKR frequency is 380 Hz and MKR amplitude is 3.92 dB
EXAMPLE:
If
then slope would be: 380 Hz 3.92 dB = 96.94 Hz/dB
(7) Press TI keys as listed in (a) through (c) below:
(a) MARKER OFF.
(b) MARKER PEAK SEARCH.
(c) [MARKER DELTA].
MKR indication between -2.9 and -3.1 dB.
(8) Adjust TI knob ccw for a
(9) Press TI keys and enter values using DATA keys as listed in (a) through (g) below:
MARKER MKR .
(a)
[MARKER NORMAL].
(b)
[MARKER CF].
(c)
SPAN then [ZERO SPAN].
(d)
CONTROL SWEEP then [SWEEP TIME] to 200 mS.
(e)
CONTROL TRIG.
(f)
[SINGLE].
(g)
NOTE
If displayed trace is not approximately 3 divisions below the
reference level, press [CONT] key and then FREQUENCY
key. Adjust displayed trace approximately 3 divisions below
reference level with TI knob.
(10) Press CONTROL TRIG key then [SINGLE] key.
(11) Press MARKER ON key and adjust TI knob to position marker on horizontal
division with greatest amplitude deviation.
(12) Press [MARKER DELTA] key and adjust TI knob to position marker at lowest
amplitude in the same horizontal division. Record absolute value of MKR amplitude indication.
(13) Multiply value recorded in (6) above by value recorded in (12) above. Result will
be less than 100 Hz.
b. Adjustments. No adjustments can be made.