HP E1340A User's Manual
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[SOURce:]SWEep
The [SOURce:]SWEep subsystem selects:
• The number of points in a frequency sweep.
• The sweep rate for frequency sweeps.
Frequency sweeping generation requires that
SOURce:FREQuency:MODE
SWEep
be set.
Sweep Considerations Frequency sweeping is controlled entirely by the on-board microprocessor
on the HP E1340A module. Only continuous repetitive sweeping is
supported. A sweep is started by the
INITiate:IMMediate command and
advances at a fixed rate determined by the number of points in the sweep
and the sweep time.
The minimum and maximum number of frequency points in a sweep are
constrained by the frequency span and the sweep time.
Looking at the span considerations, and assuming that the internal
42.94967296 MHz reference oscillator is used, the minimum and maximum
frequency increments per frequency point of a 4,096 point waveform are
.01 Hz and 15 MHz. Thus, when sweeping a 4,096 point waveform from
1 kHz to 10 kHz, the minimum number of points is 2, and the maximum is
(10 kHz - 1 kHz) / .01 Hz + 1, or 900,001 points.
Considering sweep time, the fastest the HP E1340A can sweep is 187 µS
per frequency point with AC amplitude correction disabled, or 250 µS per
point with AC amplitude correction enabled. Up to 25.5 mS additional
delay per frequency point is possible in 100 µS increments. Thus, the
fastest amplitude corrected sweep will proceed at a rate of 15 MHz/point /
250 µS/point or 60 GHz per second. The slowest non-amplitude corrected
sweep will proceed at a rate of .01 Hz/point / 25.687 mS/point or about
0.3893 Hz per second.
Also, sweeps are limited to a minimum of 2 points (the start and stop
frequencies) and a maximum of 1,073,741,825 points (not a real concern,
since each sweep would take a minumum of 3.1 days to complete).
The
SOURce:SWEep:POINts command considers all these constraints
when
MINinum or MAXimum is specified. The SOURce:SWEep:TIME
command considers the currently specified number of points and whether
AC amplitude correction is enabled when
MINinum or MAXimum is
specified.
[SOURce:]SWEep:SOURce
Chapter 7 HP E1340A Command Reference 173