Fluke 45 User Manual

Page 58

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Applications

True RMS Measurements

4

4-11

DC AND AC

TOTAL RMS

TRUE RMS =

0.000

1.000

1.000

0.900

0.636

0.000

0.707

1.000

1.000

1.000

2D

0.000

1.000

AC-COUPLED

INPUT

WAVEFORM

PK-PK

PEAK VOLTAGES

0-PK

METERED VOLTAGES

AC COMPONENT ONLY

RMS CAL*

FLUKE 45

DC

COMPONENT

ONLY

SINE

PK

0

PK-PK

2.828

1.414

1.000

1.000

0.436

0.421

1.414

2.000

0.779

0.771

1.414

2.000

2.000

1.414

2.000

1.000

1.414

1.111

0.785

1.000

0.707

3.464

2.000

1.732

4.442 K

0.962

2K

1.000

PK-PK

PK-PK

PK-PK

PK-PK

PK-PK

2

0

PK

RECTIFIED SINE
(FULL WAVE)

RECTIFIED SINE
(HALF WAVE)

0

PK

0

PK

SQUARE

PK-PK

0

PK

RECTIFIED
SQUARE

RECTANGULAR
PULSE

0

PK

X

Y

D = X/Y

K = D-D

2

TRIANGLE
SAWTOOTH

0

PK

ac + dc

2

2

* RMS CAL IS THE DISPLAYED VALUE FOR AVERAGE RESPONDING METERS THAT ARE CALIBRATED
TO DISPLAY RMS FOR SINE WAVES

2 D

aam18f.eps

Figure 4-3. Waveform Comparison Chart

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