Exfo FPM-300 Power Meter Uživatelský manuál stáhnout pdf (Strana 14)

Measuring Power or Loss (FPM-300 and FOT-300) 9

4 Measuring Power or Loss

(FPM-300 and FOT-300)

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 and

(power meter)

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.

dBm/W



1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 39 40

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Exfo FPM-300 Power Meter Uživatelský manuál Strana 14