
3. Impulse and Resolution Bandwidth Accuracy Test
dB).
‘lb
center the trace on screen, it may be necessary to press
SWEEP
(ZGY)
and adjust (CENTER FREQUENCY).
45. Press MARKER
Ia]
and position movable marker 6
dB
down
from the signal peak on the negative going edge of the trace (the
MARKER
[nl
amplitude readout should be 0.00
dB
*O.O5dB).
The
6
dB
bandwidth is given by the MARKER
[nl
frequency readout.
(See Figure 4-3.) Record in Table 4-2.
Note
6
dB
resolution bandwidth measurements are used in Performance
Test 4, Impulse
and
Resolution Bandwidth Selectivity Test.
MKR
A
3.103
MHz
,
LzEAIE\
-9
.O,
dBm
,
ATT,EN
I*
0.00
dB
u,I
A
I
I
I I I
I I I
\
/
/
I
CENTER
100.00
MHz
SPAN
5.00
MHz
RES
BW
3
MHz
VBW
3
MHz
SWP
20.0
rnsec
Figure 4-3. 6
dB
Resolution Bandwidth Measurement
46. Select the spectrum analyzer
(RESBW_)
and [FREQUENCY SPAN)
settings according to
‘Ihble
4-3. Press SWEEP
C-j
and
measure the 6
dB
bandwidth for each resolution bandwidth
setting using the procedure of steps 43 through 45 and record the
value in
‘Ihble
4-3. The measured bandwidths for 300 Hz, 100
Hz, 30 Hz, and 10 Hz should fall between the limits shown in the
table.
4-6 Option 462
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