TB 9-6625-2250-35
(d)
CONTROL BW then [RES BW] to 300 Hz.
(e)
AMPLITUDE then [REF LVL] to -10 dBm.
(f)
[ATTEN] to 0 dB.
(g)
MARKER PEAK SEARCH.
(h)
AMPLITUDE.
(i)
[MORE].
(j)
[REF LVL CAL].
(3) Slowly adjust TI knob until MKR amplitude indication is between -9.83
and -10.17 dBm.
(4) Press [STORE REF LVL] key.
(5) Disconnect TI CAL OUTPUT from INPUT 50Ω and connect a 50Ω termination
to INPUT 50 Ω.
(6) Press TI keys and enter values using DATA keys as listed in (a) through (i)
below:
(a)
INSTRUMENT STATE PRESET.
(b)
FREQUENCY then [CENTER FREQ] to 15.2 MHz.
(c)
SPAN then [SPAN WIDTH] to 30 MHz.
(d)
FREQUENCY then [CF STEP] to 28.5 MHz.
(e)
AMPLITUDE then [REF LVL] to -50 dBm.
(f)
[ATTEN] to 0dB.
(g)
CONTROL BW then [RES BW] to 10 kHz.
(h)
CONTROL TRIG then [SINGLE].
(i)
CONTROL DISPLAY then [DISPLAY LINE] to -90 dBm.
(7) Press TI CONTROL TRIG key, then [SINGLE] key, and wait for completion of
sweep. The noise level will be at least 6 dB below the display line; if not, reduce SPAN
[SPAN WIDTH] and CONTROL BW [RES BW] values to reduce noise level.
NOTE
If SPAN is reduced, [CF STEP] reduction must be no more
than 95 percent of the SPAN.
(8) If a residual is not present proceed to (13) below. If residual is suspected, press
response above the display line.
NOTE
Noise peak will not persist when [SINGLE] key is pressed.
However a residual response will persist.
(9) If response is marginal, press TI keys as listed in (a) through (d) below:
(a) INSTRUMENT STATE SAVE.
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