3 Spectrum Analyzer Mode
3.5 ACP Measurement
of signal acquisition time, FFT time, and other overhead time, to complete the
entire span of the measurement. If you need to specify the same “Sweep Time”
as you would for sweeping hardware, send [:SENSe]:<meas>:SWEep:TIME
<time>. The measurement emulates the “Sweep Time” effect, but this emulation
is not straightforward, and therefore the behavior is not specified. Instead, we
recommend using Minimum Acquisition Time, which provides better control.
Remote Command
[:SENSe]:<meas>:SWEep:TIME <time>
[:SENSe]:<meas>:SWEep:TIME?
Example Channel Power measurement:
:CHP:SWE:TIME 25ms
:CHP:SWE:TIME?
Notes In the ACP measurement in WCDMA Mode, this parameter is preset by Meas Method selection. Preset
values are as follows:
–
IBW: 29 ms
–
IBWR: 108 ms
–
FAST 7.5 ms
Dependencies On non-sweeping hardware, this control is grayed out, and the Auto/Man toggle disappears. The
read-only control shows estimated sweep time
In those instruments, "Minimum Acquisition Time" on page 1098 is available
Couplings Coupled to Span, RBW, VBW, and Sweep Time Rules when Sweep Time is set to Auto; Sweep Time
changes when these parameters are changed
When you manually set a value when in the Auto state, the state automatically changes to Man
Preset Automatically Calculated unless noted below
WCDMA Mode
–
Channel Power: 1.0 msOBW: 32.6 ms
–
ACP: 29 ms
State Saved Saved in instrument state
Min Other than non-sweeping hardware: Typically, 1 ms
Non-sweeping hardware: N/A
In the ACP measurement, when Meas Method is Fast Power, the minimum sweep time is span-
dependent and automatically calculated
Max Other than non-sweeping hardware: 4000 s
Non-sweeping hardware: N/A
Annotation The sweep time is displayed in the lower-right corner of the screen. The number of points is displayed
parenthetically, as:
Sweep 13.3 ms (1001 points)
Spectrum Analyzer Mode User's &Programmer's Reference 1097
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