Major tech MT476, Инструкция по эксплуатации

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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.
8. VOLTAGE MEASUREMENT WITH LOW INTERNAL IMPEDANCE
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.