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4. 6
dB
Resolution
Bandwidth
Accuracy Test
Related Adjustment
Specification
Description
Equipment
Procedure
6
dB
Bandwidth Adjustments
&20%,
3 MHz bandwidth
&lo%, 30 Hz to 1 MHz bandwidths
+
50%,
-0%, 10 Hz bandwidth
30 kHz and 100 kHz bandwidth accuracy figures only applicable 590%
Relative Humidity, 540” C.
The 6
dB
bandwidth for each resolution bandwidth setting is
measured with the MARKER function to determine bandwidth
accuracy. The CAL OUTPUT is used for a stable signal source.
None required
1. Press
~NSTR PRESET).
2. Connect CAL OUTPUT to SIGNAL INPUT 2.
3. Key in spectrum analyzer settings as follows:
[CENTER FREQUENCY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.20
MHZ
FREQUENCY SPAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.5
MHz
km,
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 MHz
[REFERENCE LEVEL] .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10
dBm
4. Press SCALE LIN pushbutton. Press
[SH’FT),
(my
(resolution
bandwidth) for units in
dBm.
5. Adjust [REFERENCE LEVEL) to position peak of signal trace at (or just
below) reference level (top) graticule line. Press SWEEP (SINGLE_).
6. Press MARKER [NORMAL) and place marker at peak of signal trace
with DATA knob. Press MARKER
@
and position movable marker
6
dB
down from the stationary marker on the positive-going edge
of the signal trace (the MARKER A amplitude readout should be
-6.00
dB
f0.05
dB).
It may be necessary to press SWEEP
[CONT)
and adjust [CENTER FREQUENCY] to center trace on screen.
7. Press MARKER
@
and position movable marker 6
dB
down
from the signal peak on the negative-going edge of the trace (the
MARKER Aamplitude readout should be .OO
dB
f0.05
dB).
The 6
dB
bandwidth is given by the MARKER A frequency readout. (See
Figure
4-
1.) Record this value in Table
4-
1.
4-2
Option 462