PSM1700 PsimetriQ user manual
7-6
7.3 SWEEP - Frequency sweep options
All ac measurements using the PsimetriQ generator can be
swept across a frequency range. The start frequency, stop
frequency and number of steps up to 2000 can be
specified. The measurements are subjected to the same
speed constraints set in the ACQU menu, but the filtering
does not apply on each measurement point. If continuous
sweep is selected, then the filtering is applied to each
successive sweep.
At the end of a sweep the generator may be set to stay
on, switch off, dc only with immediate effect or to drive
the ac to zero at a specific phase of the waveform. If
selected to stay on, the generator settings revert back to
those specified in the normal generator menu;
The frequency steps may be set to be logarithmically or
linearly spaced. Logarithmic spacing usually gives the
clearest display of frequency dependent parameters but
linear spacing can be useful in some applications.
The graph normally sets the y axis automatically to the
extremes of the measurements (or in FRA mode to
20dB/decade of frequency) but the axis can be fixed if
required. The graph of the second parameter (usually
phase) can also be independently manually set.
A vertical marker can be placed on the graph to reference
a specific frequency.
For visual comparison to a reference part with a known
response, the reference response can be kept on the
display drawn with a dotted line while new sweeps are
made:
1. Set the graph scaling manually.
2. Perform a sweep with the reference part.
3. Press ZERO to set the reference display.
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