PSM1700 PsimetriQ user manual
4-3
4.3 Zero compensation
There are 3 levels of zero compensation:
Trim out the dc offset in the input amplifier chain.
Measure any remaining offset and compensate.
Measure parasitic external values and compensate.
The trim of the dc offset in the input amplifier chain is re-
applied every time that the measurement function is
changed, or can be manually invoked with the ZERO key,
or over the RS232 with the REZERO command.
The measurement of the remaining offset also happens
when the offset is trimmed but is also repeated at regular
intervals when using a measurement function that requires
dc accuracy (such as the rms voltmeter). This is to
compensate for any thermal drift in the amplifier chain.
This repeated autozero function can be disabled via the
SYSTEM OPTIONS menu.
The compensation for parasitic external values (for
example to compensate for the capacitance of the test
leads when measuring capacitance) is invoked manually by
the ZERO key. Refer to each function section for the
function specific operations.
Any compensation values are stored along with the
instrument configuration when a program is stored.
To restore operation without function specific
compensation press ZERO then DELETE.
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