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3. Sweep Time Accuracy Test (220 ms)
3. Sweep Time
Accuracy Test
(220
ms)
Related Adjustment
Frequency Control Adjustments
Specification
*lo%
for sweep times
5100
seconds
&20%
for sweep times
>lOO
seconds
Description
Preferred Procedure
This test is for sweep times
220
ms. For faster sweep times, refer to
Fast Sweep Time Accuracy Test (Test 19).
A universal counter is connected to the PENLIFT RECORDER
OUTPUT (on the rear panel) of the spectrum analyzer. The counter is
used in time interval mode to determine the “pen down” (sweep time)
interval of the PENLIFT RECORDER OUTPUT. The
penlift
output
voltage level corresponds directly to the sweeping of the analyzer
(pen down = OV) and not-sweeping of the analyzer (pen up =
15V).
A
DVM is used to set the appropriate trigger level for the counter.
Alternate Procedure
Perform this procedure if the equipment for the preferred procedure
is unavailable.
Sweep time accuracy for sweep times
220
ms can also be measured
using the HP
8568B’s
internal frequency counter for a time interval
measurement.
SPECTRUM ANALYZER
UNIVERSAL
COUNTER
DIGITAL
VOLTMETER
\
Figure 2-4. Sweep Time Accuracy Test Setup
Performance Tests 2-9