Micronta 22-214A - Making Measurements; AC Voltage Riding on a DC Source Bias; Measuring 3-Phase AC Voltages

Making Measurements
AC Voltage Riding on a DC Source Bias
Measurements
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Set the
range SW
to ACV
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Note: When measuring an AC voltage superimposed on a
DC voltage source bias, ordinary measurements cannot be
made. Under such conditions, if you know the approximate
voltage of the device to be measured and the voltage is
UNDER 30V DC/AC, you can measure the voltage by
connecting a 0.14F/100V polyester film capacitor in series
with the positive terminal of the voltage source and the (+)
test lead. The range switch is set to ACV.
WARNING: NEVER ATTEMPT TO MEASURE OVER 30V AC
ON DC SOURCE BIAS.
Red Lead
Black Lead
[se 0.1.F/100V
Polyester film
Capacitor
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Measuring 3-Phase AC Voltages
Making Measurements
which is 1000VAC.
of 3 (approx. 1.732)
circuit.
This tester 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 meter, = =
To determine the RMS voltage line-to-line on a 3-phase line,
multiply the rated line-to-ground voltage by the square root
For example, on a ““600-volt 3-phase line” (i.e. GOOV line-to-
ground), the total available voltage line-to-line is 600 =
1.732, or approximately 1039 VAC. This exceeds the rating
of this tester. Severe damage as well as a dangerous shock
hazard could result if the meter were connected to this
Watch for 3-phase circuits
line-to-line.
The voltage will be higher
Remember 1000VAC is
maximum
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