Exfo FPM-600 Power Meter Manual de usuario descargar pdf (Pagina 25)

Power Meter/Light Source/Optical Loss Test Set 19

4 Measuring Power or Loss

(FPM-600 and FOT-600)

Nulling Electrical Offsets

Temperature and humidity variations affect the performance of electronic

circuits and optical detectors. Nulling the electrical offsets eliminates these

effects. Your unit has been designed not to require offset nulling under

normal operation, but you should perform it whenever environmental

conditions change significantly or when measuring very low power values.

Note: Factory-defined values will be reinstated when you turn off the unit.

To perform an offset nulling:

Hold down a few seconds. The unit

displays NULL while nulling the offsets, then

returns to normal mode.

Note: Keypad is disabled during the operation.

IMPORTANT

If light reaches the detector when nulling offsets, LIGH appears on

the display and the nulling is not performed. You will need to press

a key to return to the previous display.

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Exfo FPM-600 Power Meter Manual de usuario Pagina 25