PSM1700 PsimetriQ user manual
11-3
delay = periodic time x measured phase / 360
To look at differences in gain from a nominal value, an
offset gain can be applied either manually or by pressing
ZERO.
offset gain = measured dB – offset dB
The filtering is applied to the real and quadrature
components individually, rather than the derived
magnitude and phase values. This gives superior results as
any noise contribution to the components would have
random phase and therefore would be reduced by filtering.
PsimetriQ can operate either in real time mode at a single
frequency where the gain and phase are filtered and
updated on the display; or it can sweep a range of
frequencies and present the results as a table or graphs of
gain and phase.
The frequency points to be measured are specified with
three parameters:
number of steps
start frequency
end frequency
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.
Following a sweep on a control loop, the gain and phase
margins can be computed and displayed on the graph.
The window over which the measurements are computed
is adjusted to give an integral number of cycles of the
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