Measurement Theory; Waveform; Power Measurements - Fluke 1735 User Manual

Measurement Theory

The following formulas are the basics of the measuring values:
Voltage and current measurement
1
∫
2
V v
RMS
T
1
2
∫
I i dt
RMS
T
I I I I
N 1 2

Waveform

The angle given in the waveform function is based on the following formula.
⎡
⎢
arctan
⎢
P
⎣

Power Measurements

50
∑
P V I
k k
k 1
1 M
∑
P P
M i
M
i 1
dt
RMS value of voltages
RMS value of currents
RMS value of neutral-conductor current
3
Neutral is calculated when not measured, i.e., no 4-
phase Flexi set is connected.
⎤
P
⎥
1
⎥
2 2
Q
⎦
1 1
cos( )
active power (200 ms average values)
k
V , I
k
active power over average interval
Angle between
Q reactive power of first harmonic
1
P active power of first harmonic
1
, values of harmonics
k k
Power Logger
Measurement Theory
55