PSM1700 PsimetriQ user manual
7-8
7.4 TRIM - Trim function
The trim function on PsimetriQ is a powerful and versatile
feature that allows closed loop control of the generator
amplitude. It allows a specific measurement to be
programmed for either CH1 and CH2 and the generator
output will be adjusted to maintain the measured voltage
or current. This allows the excitation level to be controlled
over changing conditions such as a frequency sweep.
At each measurement point, the measured level is checked
against the specified level and tolerance; if an adjustment
is needed the data is discarded and a new measurement
made at the new output level. The user is alerted to the
adjustment by an audible beep.
Particularly important in control loop analysis, where it is
sometimes referred to as amplitude compression, it
prevents the control loop being overdriven as the
frequency changes.
It is also useful in a more general case where test levels
are specified.
Note that when dBm mode level control is selected, the
trim level is entered as dBm but the tolerance remains a
linear percentage of the actual voltage not the logarithmic
dBm measure.
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