Rotating Magnetic Field Direction Detection (Only Testo 755-2); Service And Maintenance; Replacing The Batteries; Maintenance - testo 755 Bedienungsanleitung

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9 Service and maintenance

8.6. Rotating magnetic field direction
detection (only testo 755-2)
The rotating magnetic field direction detector is always active,
be constantly illuminated, however rotary field direction can only be
determined in a three-phase system between the external conductors.
The instrument displays the voltage between two external conductors.
1. Connect the probe tip L1 (-) to the presumed phase L1 and the probe
tip L2 (+) to the presumed phase L2.
2. Completely cover the grip area with your hands!
- If R is constantly illuminated: "right" rotating magnetic field.
- If L is constantly illuminated: "left" rotating magnetic field.
Cross-check:
> Repeat the process with switched probe tips.
- The opposite result must be indicated.
9 Service and maintenance

9.1. Replacing the batteries

The batteries must be replaced when the battery icon is illuminated in the
LC display.
1. Fully disconnect the instrument from the measurement object.
2. Using a screwdriver, unscrew the two metal screws on the battery
compartment until the battery compartment cover can be removed. Do
not unscrew the screws completely.
3. Remove the spent batteries.
4. Insert new batteries, type AAA / IEC LR03 (1.5 V), ensuring correct
polarity.
5. Put the battery compartment cover back on and screw down.

9.2. Maintenance

When operated in accordance with the instruction manual, the instrument
does not require any particular maintenance.
If a malfunction occurs during operation, the ongoing measurement should
be stopped immediately. Send the instrument to Testo Service for checking.
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L or R may