TB 9-6625-2250-24
Table 3. Resolution Bandwidth Accuracy - Continued
Test instrument
Actual Bandwidth
CONTROL BW
Lower 3 dB
Upper 3 dB
[RES SW]
frequency
frequency
3dB
60 dB
settings
Min
Max
(14)
(27)
3 kHz1
2.7 kHz
3.3 kHz
1 kHz1
900
Hz
1.1 kHz
300 Hz1
270
Hz
330
Hz
100 Hz1
70
Hz
130
Hz
1Press
TI CONTROL BW key then [VIDEO BW] to 1 Hz.
NOTE
The 3 dB bandwidth recorded in table 3 will be used to
determine shape factor in (28) below.
(17) Repeat technique of (4) (i) and (7) through (16) above for remaining CONTROL
(18) Press TI keys and enter values using DATA keys as listed in (a) through (c) below:
(a) AMPLITUDE then [LOG dB/DIV] to 10 dB.
(b) CONTROL BW then [RES BW] to 2 MHz.
(c) [VIDEO BW] to 300 Hz.
(19) Set synthesizer/level generator amplitude to -3 dBm and AMPTD INCR to 60 dB.
(20) Press TI keys as listed in (a) through (d) below:
AMPLITUDE.
(a)
[MORE].
(b)
[IF ADJUST].
(c)
[ADJ CURR IF STATE] wait for IF ADJUST STATUS messages to disappear.
(d)
(21) Press synthesizer/level generator FREQUENCY key and adjust frequency to
peak signal amplitude on TI display.
NOTE
At 2 MHz setting, several minor peaks might be observed.
Select peak with highest amplitude.
(22) Press synthesizer/level generator AMPLITUDE key then INCR
key.
(23) Press TI MARKER ON key then [MARKER DELTA] key.
key.
(24) Press synthesizer/level generator INCR
(25) Press synthesizer/level generator FREQUENCY key and increase frequency for
a TI MKR indication between -0.02 and +0.02 dB. Record synthesizer/level generator
frequency indication as upper 60 dB frequency.
(26) Decrease synthesizer/level generator frequency past TI signal amplitude peak
MKR indicates between -0.02 and +0.02 dB. Record synthesizer/level
amplitude until
generator frequency as lower 60 dB frequency.
12