Everfine LT- 101A - Chapter 5 Operations; Input Characteristics Test at Steady State

LT-101A User’s Manual
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16
Chapter 5 Operations
5.1 Input characteristics test at steady state
5.1.1 Testing parameters
The input RMS values of voltage and current, active power, power factor, frequency,
total harmonic distortion of voltage and current, RMS and relative values of harmonic
from 0
th
to 50
th
can be measured.
5.1.2 Window display
During general test, window A displays RMS value of the voltage, window B displays
RMS value of the current, window C displays the active power, and window D can
display the power factor or the frequency according to the selection.
During harmonic analysis, window A displays the RMS or relative value
（
V%
）
of
harmonic voltage in different orders, window B displays the RMS or relative value
（
A%
）
of harmonic current in different orders, window C displays order of the
harmonic or the total harmonic distortion (THD), and window D displays CSA or IEC
according to the selection.
Note: There are two formulas for the calculation of THD, which are IEC and CSA.
IEC method: THD=
%100
)(
1
2
2



C
C
n
k
k
CSA method: THD=
%100
)(
)(
1
2
2
2





n
k
k
n
k
k
C
C
where THD is the relative value of total harmonic distortion of voltage or current;