8-4
PEM-340
Operation Manual
8-3. Offset Cancel
The Offset Cancel function enables compensation of the dark current of the photodetector.
The PEM-340 can be used directly after the power has been switched on and the initialization
procedure has completed. However, to ensure high accuracy, it is recommended that the unit
is allowed at least ve minutes to warm up before any measurements are taken. After the unit
has warmed up, ensure the cover is on the optical input connector so that no light enters the
instrument and press the [ZERO] key to perform the Offset Cancel.
7.8. Changing Display Units
The Power Display Panel can display the optical power in either mW or dBm. The display is
toggled by pressing the Optical Power Unit Selector Key.
8-4. Changing Display Units
7.8. Changing Display Units
In normal operation the PEM-340 outputs a value for PER for each 360˚ rotation of the
polarizer. This is the averaged value of two measurement cycles. The PER averaging can be
turned on or off. The command is only available through the communication interfaces using
the AO and AF commands (see Section 9 for details).
8-5. PER Averaging Function
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