Table of Contents
Advertisement
1745
Users Manual
Measurement Theory
The following are the equations used by the Logger and PQ Log to produce the
results you see in PQ Log. Measurement Function A logs current and voltage
harmonics, while Measurement Function P does not:
TRMS value of voltage
and current. Basic values
on 200 ms per phase
RMS value of voltage and
current per logging
interval per phase
Active power calculated
from FFT from samples of
voltage and current. Basic
value on 200 ms per phase
Fundamental
Shop for Fluke products online at:
38
1
N
∑
V
.
bas
N
i
1
N
∑
I
bas
N
i
N: Number of samples in 200 ms intervals (2048)
1
V
.
RMS
M
1
I
RMS
M
M: Number of samples in 200 ms intervals per
logging interval
P
V
.
I
.
cos
n
n
n
V
: RMS value of voltage harmonics of order n
n
I
: RMS value of current harmonics of order n
n
n Order of the harmonics
φ
: Phase angle between current and voltage
n
harmonics of order n
P
: Harmonics of the active power of order n
n
50
∑
P
P
bas
n
n
1
MyFlukeStore
www.
2
V
i
1
2
I
i
1
M
∑
2
V
basj
j
1
M
∑
2
I
bas
j
j
1
n
.com
1.877.766.5412
Advertisement
Table of Contents
