TB 9-6625-2250-24
Table 3. Resolution Bandwidth Accuracy - Continued
Test instrument
3 dB Bandwidth Limits
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
BW [RES BW] settings in table 3.
(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