Bedienungsanleitung Metrel MD 9070 (Seite 11 von 116) (Deutsch, Englisch, Französisch, Italienisch)

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MD 9070 Insulation/Continuity Digital Multimeter Operation

Normal forward voltage drop (forward biased) for a good silicon diode is between 0,400

V to 0,900 V. A reading higher than that indicates a leaky diode (defective). A zero

reading indicates a shorted diode (defective). An OL indicates an open diode (defective).

Reverse the test leads connections (reverse biased) across the diode. The digital

display shows OL if the diode is good. Any other readings indicate the diode is resistive

or shorted (defective).

Earth Continuity Test function

WARNING

This function measures the Resistance values of earth connection and equipotential

bonding in Low Voltage Distribution Systems up to Nominal Voltage (Un) 830V, phase-

to-phase. DO NOT use on Systems with Nominal Voltages above that. Measurements

shall only be carried out on de-energized circuits. The measuring loop is protected by

an HBC 1kV F fuse against accidental extraneous overvoltages.

The LCD icon used alone throughout in this manual is referred as active

measurements of Earth Continuity Test function through the activation of the TEST

button on the meter or on the Remote Probe. Check the fuse before each . If the

fuse is open, the meter will display “OPEN” when the is being activated at no circuit

connection to the probes. Refer to the maintenance section for fuse replacement.

is inhibited when the meter beeps and displays “> 2 V” plus warning against

energized circuit of more than 2 V is being connected, before the is active.

Connecting to energized circuits when the is active will produce false results and

may blow the protection fuse and/or damage the instrument. Always check with voltage

functions and remove power from the circuits before carrying out the .

The results of measurements can be adversely affected by impedances of additional

operating circuits connected in parallel or by transient currents.

Setup as illustrated below. This function uses measuring currents of ≧ 200 mA for

2,199 Ω range and ≧ 90mA for 21,99 Ω range measurements, auto-ranging. Press the

RANGE button momentarily to override auto-ranging and select a range. Press and

hold for 1 second or more to resume auto-ranging.

The is active as long as the TEST button is pressed and hold. The TEST buttons on

the meter and on the Remote Probe work alike. The Continuity Resistance readings are

shown on the primary display. The RANGE of measuring current is indicated on the

secondary display as “200 mA” or “90 mA”. The meter further gives a beep sound for

continuity when the active Resistance reading is “< 2 Ω”.

Default startup primary display reading is “-.---”. Allow enough time for a good

measuring result. After the is released, the last measuring display stays until the

next or a function change.

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