Amprobe PRM-2 Phase-Sequence - Manual (Page 9)

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sent on one or two leads and the remaining leads are connected to neutral or ground, both or all
LEDs will illuminate not including the phase sequence LEDs.
•
If the voltages of all phases are correct it is possible to read out the phases’ order by observing
the illumination of the LED marked as “NORMAL (ABC)” or “REVERSE”.
•
After conducting a test, the instrument should be disconnected from the circuit under test. The
tester left under voltage for long periods of time can overheat. In such a case the built-in thermal
protection will disconnect the electronic system and the indications will be switched off. If such a
situation occurs you should disconnect the tester from the installation and wait a few minutes
before another use of the tester (the tester will run automatically after cooling down).
4.2 Features (PRM-2)
•
Indication of phase sequence in the wide range of power network voltages.
•
Phase voltage drop indication: the tester indicates phase voltage losses and sags on one or two
other phases by turning off corresponding LED: (A, B or C) and phase sequence indicator LED.
•
Thermal protection of the tester (self-recovery thermal circuit breaker protects the tester from
overheating, when left connected to a network for a long period of time).
4.3 Cleaning and Maintenance (PRM-2)
The tester casing should be cleaned with a soft, wet flannel, using generally available deter- gents. Do
no use any solvents, nor cleaning agents that could scratch the casing (powders, pastes, etc.).