PSM1700 PsimetriQ user manual
11-4
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 unless
repeat sweep is selected.
The top of the vertical axis for the graph is normally set to
be the highest measured value during the sweep. The
bottom of the vertical axis is normally either set to the
lowest measured value or the result of the highest value
less 20dB/decade of frequency. The vertical axis can be
fixed to a manual scale using the menus.
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.
Following a sweep the GRAPH key selects between:
graph of gain v frequency
graph of phase v frequency
graph of gain and phase v frequency.
Pressing HOME or TRIG restarts the real time
measurement at the selected frequency.
Although it is most usual to use the PsimetriQ generator
when performing gain/phase analysis, there may be
circumstances where this is impractical, for example
measuring across a transformer under load. 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
gain and phase can be measured reliably.
When using an external frequency reference there can be
no sweep function.
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