MS8218 True RMS Multimeter
Operation Methods
DC mV/AC mV/DC mV+AC mV
Measurement
The testing chart is shown in the Figure 3-3. The voltage measurement range is of
1
µ
V~500mV
and the measurement
methods are as follows:
18
Turn on the power switch and set the rotary switch to the position
mV:-:-:
/"'(+:.
"-
Insert the red testing line into the V
0
Hz end and the black testing line into the COM end.
Press the SELECT key to select DCm V or Acm V or DCm V + Acm V measurement modes.
When performing DCmV measurement, connect the red probe to the positive polarity of the measured voltage and the
black probe to its negative polarity. While performing ACmV or DCmV+ ACmV measurement, it will be done by
connecting the red probe and the black probe into the two ends of the measured voltage.
5.
Read the measured value from the display screen. If OL displaying on the meter, it indicates the measured voltage
l.
2.
3.
4.
exceeding the range of the meter and it is necessary to remove both the red and black probes from the measured circuit
immediately.
6.
When performing DCmV or ACmV measurement, by pressing the RANGE key it is possible to select range manually.
The indicator of range indicates the range value.
If
OL displaying during manual range measurement, it is necessary to
select a larger range. If OL displaying under the maximum range, it is necessary to remove both the red and black
probes from the measured circuit immediately. When performing DCmV + ACmV measurement automatic range will
be held and it is void to press the RANGE key.
Notes: In case of probe hanging in the air, the voltage inducted by the testing line may cause unstable readings on the
display screen, but that will not affect the accuracy of measurement.When performing DCmV + ACmV measurement it will
be relatively slow to refresh the measured data as it needs time to switch AC and DC measurements and to calculate RMS.
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