Exfo FOT-930 Multifunction Loss Tester Bedienungsanleitung PDF herunterladen (Seite 40)

Measuring Power or Loss

32 FOT-930

Nulling Electrical Offsets

Temperature and humidity variations affect the performance of electronic

circuits and optical detectors. Nulling the electrical offsets eliminate 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: Starting a nulling automatically deactivates all light sources on the unit.

To perform an offset nulling:

1. Press Menu, then select Setup > Power Meter.

From the Power Meter pane, press Setup (F1/F2 key).

2. Press Nulling (F1/F2 key).

3. Tighten the protective caps on the power

meter and F

ASTEST ports, then press OK.

The nulling process takes approximately 10

seconds. Check marks appear next to nulled

detectors. If light is still detected, you will

need to place the caps properly and restart.

IMPORTANT

Light must not reach detectors when nulling offsets. Always use an

EUI or protective screw cap. Do not use a soft rubber cover.

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Exfo FOT-930 Multifunction Loss Tester Bedienungsanleitung Seite 40