Rohde & Schwarz R&S UPP, Руководство пользователя

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Instrument Functions
R&S
®
UPP
298 User Manual 1411.1055.32 ─ 10
Remote command:
SOURce:SWEep:FREQuency:HALT:VALue
on page 719
SOURce:SWEep:PHASe:HALT:VALue
on page 719
SOURce:SWEep:VOLTage:HALT:VALue
on page 719
5.9.8 Sweep Speed
The time required for a sweep cycle is only relevant for automatic sweeps and is deter-
mined by the following factors:
●
Setting time of the generator
●
Required dwell time; depends on the characteristics of the DUT (e.g. settling time)
●
Only with synchronous sweeps (i.e. when using the internal analyzer): Measure-
ment speed
The setting times of the generator and, if necessary, the measurement time should be
minimized in order to ensure the shortest possible cycle time and thus a high sweep
speed. A series of optimization options are provided for this purpose:
Minimizing the generator setting time
The setting time of the digital generator part is just a few microseconds and can there-
fore be disregarded. However, configuration of the analog software in the analog gen-
erator (which involves settling procedures) requires a number of milliseconds and
should therefore be avoided for sweeps wherever possible.
●
Use of a fixed level range for level sweeps and active precorrection; the level
should be set to the highest value that occurs during the sweep. The automatic
operating mode controls the level of the analog hardware to maximize the signal-
to-noise value of the generator at every level. This mode should only be used if
sweeping is to be performed over several decades and both the DUT and the mea-
surement function require a high S/N value.
●
Turning the filter off . Whenever the frequency or level is changed, if a filter is
switched on, it requires a settling time – even if it is only a short one.
●
Turning off the frequency equalizer for frequency sweeps. If the equalizer is acti-
vated, a new level must be set for each new frequency. An alternative method of
frequency response correction is to use suitable reference curves when recording
the measured values.
●
Reducing the dwell time when using an external analyzer. The dwell time
required by the DUT and the external analyzer must be determined by trial and
error and can be specified as a fixed value or separately for each sweep point as a
list.
Sweeps