USER’S MANUAL
PD-183
Page 12
07/2015
The relationship between the total true RMS (AC+DC) and the
component AC and DC signals is given by the following expression:
True RMS =
√
(AC RMS Component)
2
+ (DC Component)
2
RMS is equivalent to that DC value which dissipates the same
amount of power in a resistor.
VRMS VDC
=
R
R
2
2
=
Power
" Average-responding " meters provide accurate RMS readings for
sinusoidal signals, but can introduce significant errors when
measuring nonsinusoidal waveforms.
The following table shows the errors that result when the average-
responding measurement is used instead of the True RMS value.
Power Calculations (watts) from Voltage Measurements
(VpK=100V, Load=1kW resistor)
AC RMS average
responding
AC True RMS
Error
Sine wave
5.0
0%
Square wave
12.3
+23%
Triangle wave
3.1
-6%
This multimeter is AC coupled and will accurately measure the AC
RMS component of an input signal. The DC voltage function will
measure the DC component. To obtain the total true RMS value,
measure the RMS AC component on the AC function and the DC
component on the DC function. Then, calculate the True RMS value,
using the measured AC and DC components and the True RMS
expression given above.
Summary of Contents for PD-183
Page 1: ...MULT METRO DIGITAL DIGITAL MULTIMETER PD 183 0 MI1425...
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Page 6: ...MANUAL DE INSTRUCCIONES PD 183...
Page 26: ...MANUAL DE INSTRUCCIONES PD 183 P gina 20 07 2015...
Page 30: ...USER S MANUAL PD 183...
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