
21. Fast Sweep Time Accuracy
Test
(~20 ms)
5. Press MARKER [PEAK SEARCH),
(MKR],
loFF).
6. Set [FREQUENCY SPAN] to 0 Hz,
(RES]
to 3 MHz,
[VlDEoj
to 3
MHz, and press TRIGGER [VIDEO).
7. Set synthesized sweeper for an amplitude-modulated output.
8. Set function generator controls as follows:
FUNCTION . . . . .
. . . . . .
triangular wave
AMPLITUDE . . . .
.
.
.
. .
. .
.
.
.
.
.
approximately 1 Vp-p
OFFSET . . . . . . . . . . .
.
.
.
.
.
. .
. .
.
.
.
. . . . .
CAL position (in)
SYM
. . . . . . . . . . . . . .
.
.
.
. . .
. .
.
.
. . . . .
CAL position (in)
TRIGGER PHASE .
.
.
.
. .
. .
.
.
. .
.
.
.
. . . . . . . . . . .
FREE RUN
MODULATION . . . .
.
.
. .
.
.
. .
.
. .
.
. . . . . . . . . . . . . . . .
all out
9. Key in (SWEEP TIME] 5 ms and set function generator for a reading
of 2.00 f0.02
kHz.
.
.
.
.
.
.
.
.
.
.
10. Adjust spectrum analyzer TRIGGER LEVEL to place a peak of
the triangular waveform on the first graticule from the left edge
of the CRT display as a reference. (Adjust function generator
amplitude, if necessary, to provide a signal large enough to
produce a stable display.) The fifth peak from the reference
should be within
~tO.5
division of the sixth graticule from the left
edge of the display. (See Figure 2-36.)
11. Using sweep times and function generator frequencies in
Table
2-23, check sweep time accuracy for sweep times
~20
ms by
the procedure of step 10.
Figure 2-36. Fast Sweep Time Measurement (~20 ms)
Performance Tests
2-85
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