Waveform Comparison And Conversion; Multiplication Factors For Converting Waveforms - Fluke 8062A Instruction Manual

2-14. Waveform Comparison and Conversion

Figure 2-8 shows the relationship between common waveforms and the
display readings for the 8062A and average-responding meters. Figure 2-8
also illustrates the relationship between ac and dc measurements for ac-
coupled meters. For example, consider the first waveform, a 1.414V (0-pk)
sinewave. Both the 8062A and the rms-calibrated average-responding meter
display the correct rms reading of 1.000V (the dc component equals 0).
However, consider the 1.414V (0-pk) rectified square wave. Both types of
meters correctly measure the dc component (0.707V). But only the 8062A
correctly measures the ac component (0.707V). The average-responding
meter measures 0.785V, which amounts to a 5.6% error in the total rms
measurement calculated from the ac and dc components.
AC Coupled
Input
Waveform PK - PK
Sine
2.828
PK
PK-PK
0
Rectified Sine
1.414
(Full Wave)
PK
PK-PK
0
Rectified Sine
2.000
(Half Wave)
PK
PK-PK
0
Square
2.000
PK
0
PK-PK
Rectified
1.414
Square
PK-PK
PK
0
Rectangular
2.000
Pulse
PK
PK-PK
X
0
Y
D = X/Y
2
K = D-D
Triangle
3.464
Sawtooth
PK
0
PK-PK
RMS CAL is the displayed value for average responding meters that are calibrated to display RMS for sine waves.
Figure 2-8. Multiplication Factors for Converting Waveforms
Peak Voltages
0 - PK
1.414
1.414
2.000
1.000
1.414
2.000
1.732
Operation Instructions
Display Readings
AC Component Only
RMS CAL* 8062A
1.000 1.000
0.421 0.435
0.764 0.771
1.110 1.000
0.785 0.707
2.22K 2K
0.960 1.000
Operation
DC and AC
DC Total RMS
TRUE RMS =
Component
2
ac + dc
only
0.000 1.000
0.900 1.000
0.636 1.000
0.000 1.000
0.707 1.000
2D 2
D
0.000 1.000
2-13
2
2