TB 9-6625-2250-24
(27) Subtract lower 60 dB frequency recorded in (26) above from upper 60 dB
frequency recorded in (25) above. Record the result as actual 60 dB bandwidth in table 3.
recorded in table 3 above. The result must be a shape factor of 15 or less.
(29) Set synthesizer/level generator frequency to 40 MHz.
(30) Press TI MARKER OFF key.
(31) Repeat technique of (18) (b) and (20) through (30) above for remaining
CONTROL BW [RES BW] settings listed in table 3.
b. Adjustments. No adjustments can be made.
11. Input Attenuator Accuracy
a. Performance Check
(1) Connect equipment as shown in figure 2.
Figure 2. Input attenuator accuracy (50 MHz) - equipment setup.
(2) Press synthesizer/level generator keys to values as listed in (a) through (c) below:
(a) FREQUENCY to 50 MHz.
(b) AMPLITUDE to -50 dBm.
(c) AMPTD INCR to 10 dB.
(3) Press TI keys and enter values using DATA keys as listed in (a) through (k) below:
INSTRUMENT STATE PRESET.
(a)
[REALIGN LO & IF] wait for ADJUST STATUS messages to disappear.
(b)
INSTRUMENT STATE RECALL.
(c)
[MORE].
(d)
[FACTORY PRSEL PK].
(e)
FREQUENCY then [CENTER FREQ] to 50 MHz.
(f)
SPAN then [ZERO SPAN].
(g)
AMPLITUDE then [REF LVL] to -70 dBm.
(h)
[LOG dB/DIV] to 1 dB.
(i)
CONTROL BW then [RES BW] to 3 kHz.
(j)