MS8218 True RMS Multimeter
Introduction to the Meter
Function Descriptions
Along with the conventional measurement functions this meter also possesses some special functions which being described as
follows:
•
True effective value (TRUE RMS) measurement: all the measurement values of this meter on the AC voltage and AC
current are true effective values, which distinguishing this meter from the low-grade meters which only can measure the AC
average value.
•
dBm measurement: dBm measurement is a value calculated and displayed under the current AC voltage, with a virtual
resistance R obtained through RANGE key and according to the following formula:
10
lo910(1000V
2
/R)
It
is the AC power expressed in the logarithmic form.
•
DC+AC measurement: when measuring voltage or current having both the AC and the DC components, in case of selecting
the DC+AC measurement mode, this meter will perform measurements on both DC and AC components respectively and
then calculate and display the results according to the following formula:
,JDC
2
+
AC
2
DC+AC measurements reflect the general effective values generated jointly by both the DC and AC components.
•
Automatic and manual ranges: When turning on the meter's power switch the meter defaults the automatic range
state(AUTO displaying), and simultaneously it will automatically select the proper range according to the measured electric
parameters. If OL being displayed under automatic range, it indicates the measured value exceeding the meter's maximum
range. Pressing the RANGE key under the automatic range the meter will enter the manual range(MANUAL displaying),
then pressing the RANGE key again it will be possible to select the required range. The indicator for range will display the
maximum value of this range. If OL displaying under the manual range, it indicates the measured value exceeding the
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