TB 9-6625-2339-24
11. Residual FM
a. Performance Check
(1) Connect RF reference source leveling head output connector to TI INPUT 50.
(2) Set RF reference source frequency to 1.0 GHz and level output to -10 dBm.
(3) Press TI keys as listed in (a) through (n) below:
(a) Preset.
(b) [Factory Preset] (if it is displayed).
(c) Sweep, [Points 401].
(d) FREQUENCY, 1, [GHz].
(e) SPAN, 1, [MHz].
(f) AMPLITUDE, [Ref Level], 9, [dBm].
(g) [Scale/Div], 2, [dB].
(h) BW/Avg, [Res BW], 1, [kHz] (Man).
(i) Peak Search (or Search).
(j) SPAN, [Span Zoom], 5, [kHz]. Wait for the SPAN 5 kHz message to appear.
(k) Peak Search (or Search), Marker, [Marker Ref Level], Marker, [Off].
(l) Single. Wait for sweep to finish.
(m) Peak Search (or Search).
(n) [Meas Tools], [Delta].
(4) Adjust TI RPG knob ccw until the Mkr1 amplitude indicates between -7.7 and
-8.3 dB and press [Delta] key.
(5) Adjust TI RPG knob ccw for a Mkr1 indication between -3.7 and -4.3 dB.
(6) Divide Mkr1 frequency (in Hz) by Mkr1 amplitude (in dB) to obtain slope of
resolution bandwidth filter and record result.
EXAMPLE: If Mkr1 frequency is 380 Hz and Mkr1 amplitude is 3.92 dB,
slope would be: 380 Hz 3.92 dB = 96.94 Hz/dB
(7) Press TI keys as listed in (a) through (d) below:
(a) Marker, [Off].
(b) Peak Search (or Search).
(c) [Meas Tools].
(d) [Delta].
(8) Adjust TI RPG knob ccw for a Mkr1 indication between -10.3 and -9.7 dB.
(9) Press TI keys as listed in (a) through (g) below:
(a) Marker, [Normal].
(b) Marker, [MkrCF].
(c) Single.
(d) BW/Avg, [Video BW] (Man), 1, [kHz].
(e) SPAN, [Zero Span].
(f) Sweep, [Sweep Time], 1, 0, 0, [ms].
(g) Single.
