TB 9-6625-2333-35
- 3 dB BW
Test instrument
error limits
Span
-3 dB bandwidth
RES BW settings
(%)
Ideal
Actual
Measured
Corrected
2 MHz
2 MHz
MHz
-25, +50
25
1 MHz
1 MHz
MHz
10
300 kHz
300 kHz
kHz
10
100 kHz
100 kHz
kHz
30 kHz
30 kHz
kHz
10
10
10 kHz
10 kHz
kHz
10
3 kHz
N/A
N/A
1 kHz
N/A
N/A
10
300 Hz
N/A
N/A
10
(13) Press TI INSTRUMENT STATE RECALL key then [RECALL STATE] key
and then [STATE 0] key.
(14) Set synthesizer/level generator frequency to 40 MHz.
(15) Press synthesizer/level generator AMPLITUDE key then INCR ⇓ key.
(16) Press TI MARKER PEAK SEARCH key then [MARKER DELTA] key.
(17) Press synthesizer/level generator INCR ⇑ key.
(18) Press TI INSTRUMENT STATE SGL SWP key and wait for the completion of
new sweep.
(19) Press TI MARKER MKR key. Adjust TI knob ccw until ∆ MKR indicates 0 dB
0.017 dB. The marker should be on the left-hand skirt of the signal. If the marker cannot
be set exactly to 0 dB, note whether the marker is just above or just below the actual -3 dB
point.
(20) Press TI [DELTA MARKER] key. Adjust TI knob cw until ∆ MKR indicates 0
dB 0.017 dB. The active marker should be on the right-hand skirt of the signal. If the
marker was just above the -3 dB point in (19) above, set the marker just below the -3 dB
point. If the marker was just below the -3 dB point in (19) above, set the marker just above
the -3 dB point.
(21) If TI RES BW setting is 3 kHz or less, record TI ∆ MKR frequency indication as
corrected -3 dB bandwidth in table 4 and proceed to (24) below.
(23) Calculate corrected -3 dB bandwidth using formula below and record the result
in table 4 for the current TI RES BW setting.
Corrected -3 dB BW = (Actual Span/Ideal Span) x Measured -3 dB BW
Example: RES BW setting = 1 MHz
Ideal Span = 1.0 MHz
Actual Span = 1.05 MHz
Measured -3 dB BW = 913 kHz
12
