Polarization Extinction Ratio Meter PEM-340
6-3
(10) [ZERO] Key (Offset Cancel)
a.
Enables compensation for the dark current of the photodetector. A cover should be placed
over the optical input connector to prevent any stray light entering the unit before this button
is pressed.
b.
Pressing this key when the power to the PEM-340 is rst switched on sets the RS-232C
delimiter to LF (line feed).
(11) Serial Interface (SIF) Connector
Used for RS-232C communication.
(12) Power On / Off Key Switch
Operated using the power switch key, this is used to switch the unit on and off.
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