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MD 9040 & MD 9050 Digital multimeter Operation
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*Note: When measuring a 3-phase system, special attention should be taken to the
phase-to-phase voltage which is significantly higher than the phase-to-earth voltage. To
avoid exceeding the voltage rating of the protection fuse(s) accidentally, always
consider the phase-to-phase voltage as the working voltage for the protection fuse(s).
Electric Field EF-Detection (MD9050 only)
At any function, press the EF button for one second or more to toggle to EF-Detection
feature. The meter displays “E.F.” when it is ready. Signal strength is indicated as a
series of bar-graph segments on the display plus variable beep tones.
Non-Contact EF-Detection: An antenna is located along the top of the meter, which
detects electric field surrounds current-carrying conductors. It is ideal for tracing live
wiring connections, locating wiring breakage and to distinguish between live or earth
connections.
Probe-Contact EF-Detection: For more precise indication of live wires, such as
distinguishing between live and ground connections, use the Red (+) test probe for
direct contact measurements.
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