TB 9-6625-2250-24
b. Adjustments
NOTE
Allow TI 30 minutes
warm-up
before
performing
the
adjustment below.
(1) Adjust A15R306 (located on A15 board) for a measuring receiver indication
between 299.99997 and 300.00003 MHz.
(2) Adjust A15R561 (located on A15 board) for a measuring receiver indication
between -9.95 and -10.05 dBm.
9. Displayed Average Noise Level Test
a. Performance Check
(1) Connect TI CAL OUTPUT to INPUT 50 .
(2) Press TI keys and enter values using the DATA keys as listed in (a) through (k) below:
INSTRUMENT STATE PRESET.
(a)
FREQUENCY then [CENTER FREQ] to 300 MHz.
(b)
SPAN then [SPAN WIDTH] to 2.5 kHz.
(c)
AMPLITUDE then [REF LVL] to -10 dBm.
(d)
[ATTEN] to 0 dB.
(e)
CONTROL BW then [RES BW] to 100 Hz.
(f)
[VIDEO BW] to 30 Hz.
(g)
MARKER PEAK SEARCH.
(h)
AMPLITUDE.
(i)
[MORE].
(j)
[REF LVL CAL].
(k)
(3) Slowly adjust TI knob until MKR indication is between -9.83 and -10.17 dBm.
(4) Disconnect CAL OUTPUT from INPUT 50
and connect a 50
termination to
INPUT 50 .
(5) Press TI keys and enter values using DATA keys as listed in (a) through (h) below:
AMPLITUDE then [REF LVL] to - 50 dBm.
(a)
SPAN then [ZERO SPAN].
(b)
FREQUENCY then [CENTER FREQ] to 10 kHz.
(c)
CONTROL BW then [VIDEO BW] to 1 Hz.
(d)
CONTROL TRIG.
(e)
[SINGLE].
(f)
[SINGLE] wait for completion of sweep.
(g)
MARKER ON.
(h)
(6) TI MKR amplitude indication will be <-90 dBm.
