Major tech MT476 Руководство по эксплуатации - Страница 10

Просмотреть онлайн или скачать pdf Руководство по эксплуатации для Мультиметр Major tech MT476. Major tech MT476 16 страниц. 690v voltage tester

7. CARRYING OUT MEASUREMENTS

The twin-pole voltage tester has two handles, a connecting cable and an

LCD display. Always hold the voltage tester in such a way that you get a

vertical view of the display. Strong incidence of light may have an adverse

effect on the display. For DC measurements, test tip is the positive pole,

and the test tip is the negative pole.

Before each voltage measurement, check that the device is working

properly by measuring a known voltage source. If the tester's LCD display

remains blank, take the voltage tester out of operation. A defective

voltage tester must not be used. Do not operate the device with flat

batteries or without batteries. Observe the regulations regarding work

with electrical systems.

The device can be used for the following types of measurement:

Voltage measurement with high internal impedance

Always hold the voltage tester by the handles designed for this purpose.

Never touch the device beyond the handle ends. Hold the two test tips

onto the measuring points to be tested. The voltage tester switches on

automatically with voltages higher than 4.5V AC/DC. The voltage

measured is shown on the LCD display. If the measured voltage falls

below 4.5 V AC/DC, the voltage tester switches off automatically. The LCD

display shows the voltage values numerically and in the form of a

bargraph. The type of voltage (alternating current = AC or direct voltage

= DC) and the polarity are also shown on the LCD display. In the event of

negative DC voltage, the numeric voltage value is preceded by " - ".

Positive DC voltage is shown without a positive sign preceding the value.

Thanks to the input impedance of approx. 600KΩ, it is possible to

perform voltage tests with high input impedances without time

restrictions. The voltage tester also indicates a rotating direction (L or R)

with measurements on single-phase mains (L1 against N). This is not a

device malfunction.

This function is particularly useful for testing installations. Due to the

lowered internal impedance, capacitive voltage is suppressed. The reading

shows the actual voltage applied. Similarly, measuring phase (L1) on

earth wire (PE) may trigger fault-current circuit breakers (Fl or RGI). This

measuring procedure can be used for measurements above 12V. Always

hold the voltage tester by the handles designed for this purpose. Never

touch the device beyond the handle ends. Hold the two test tips onto the

measuring points to be tested. Press the two push-buttons and

simultaneously.

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