SM-3

Can be used as a stand alone unit to perform thermal
compensation of ACPD measurements.
Switching between channel A and B is carried out continuously, at
rates of 3.2, 8 and 16 seconds, user selectable.
Both analogue and digital outputs are provided. The unit is
primarily designed to work with the CGM-5R.

Matelect manufactures the SM-3 for switching between two channels of ACPD data and performing
the division of the recorded values automatically. This frees the user from having to attend the
experiment and allows temperature normalisation to be performed during long term tests (where it
is more likely to prove important to do so).
The SM-3 unit switches between the two ACPD channels a preset time (of variable duration). The
switched signal is routed via a standard CGM-5R for processing and then routed back to the SM-3 so
that a highly accurate analogue division can be performed. The resultant normalised signal can
then be recorded by a chart recorder or a PC via Labview drivers for the SM-3.