PSM1700 PsimetriQ user manual
12-3
PsimetriQ computes a multiplying factor that it applies to
the start frequency for the specified number of steps. Note
that due to compound multiplication it is unlikely that the
end frequency will be exactly that programmed. The
frequency sweep is initiated by the START key, and when
completed the data can be viewed as a table or graphs or
printed out.
The window over which the measurements are computed
is adjusted to give an integral number of cycles of the
input waveform. In real time mode the results from each
window are passed through a digital filter equivalent to a
first order RC low pass filter; in sweep mode each result
comprises a single window without any filtering.
The ZOOM function can be used to select up to four
parameters from the display when in real time mode. It
has no function following a sweep.
Although it is most usual to use the PsimetriQ generator
when making Phase Angle Voltmeter measurements, there
may be circumstances where this is impractical, for
example measuring LVDT displacement under actual circuit
conditions. In this case, turn off the PsimetriQ generator
(OUT menu) and the frequency reference for the analysis
is measured from channel 1. Provided that the signal is
clean enough for an accurate frequency measurement
(and for DFT analysis the frequency does need to be
accurately known), then the measurements can be made
reliably.
When using an external frequency reference there can be
no sweep function.
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