Micronta 22-195A - VOLTAGE MEASUREMENT SPECIFICS; Reading Decimal Points; 3-Phase AC Voltage Measurement

5. Read the range by the position of the
decimal point.
On the 300V and 300 mV ranges, the
decimal point will appear in the same position
(one place to the left), but when the 300 mV
range is selected, "mV" will appear in the
display.
When the Voltage (DC or AC) function is
selected, the display may show some "phan-
tom" readings, especially in the lower ranges.
This is normal and is caused by the high sen-
sitivity and high input impedance of the
meter's circuitry. As soon as a circuit is con-
nected, normal accurate measurements are
performed.
When the function is changed from
resistance, diode check or continuity to DC
voltage, and the meter is in the millivolt
range, the display may show overrange. This
is caused by an internal voltage applied to the
probe for resistance measuring which cannot
be discharged due to the high input im-
pedance of the meter. Touch the ends of
probes together to discharge this voltage.
Measuring 3-Phase AC Voltages
This meter is designed primarily to measure
household AC voltages. When measuring
3-phase circuits line-to-line, the value of the
voltage will actually be higher than the rated
line-to-ground 3-phase voltage. It is important
that you do not exceed the maximum RMS
AC rating of this mieter, which is 750VAC. To
determine the RMS voltage line-to-line on a
3-phase line, multiply the rated line-to-ground
voltage by the square root of 3 (approx.
1.732).
For example, on a "480-volt 3-phase line"
(i.e. 480V line-to-ground), the total available
voltage line-to-line is 480 x 1.732, or
approximately 832 VAC. This exceeds the
rating of this meter. Severe damage as well
as a dangerous shock hazard could result if
the meter were connected to the circuit.
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