Chroma 63800 Series, Operation & Programming Manual

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Programmable AC/DC Electronic Load 63800 Series Operation & Programming Manual
4-2

Power factor (PF)
Displays the power factor of the load and computed as:
S
P
PF
=

Crest factor (CF)
Displays the crest factor of current and computed as:
rms
PK
I
I
CF
=
where
PK
I
represents the peak value of current.

Impedance (R)
Displays the impedance of the load and computed as:
rms
rms
I
V
R
=

Frequency (F)
Displays the frequency of the UUT input voltage.

Total Harmonic Distortions (THD)
Displays the total harmonic distortions of the UUT input voltage and computed as:
1
2
1
2
h
h rms
V
V V
THD
−
=
where
1 h
V represents the fundamental component of voltage.
If the frequency is out of the specification, the measurement will not be in
the normal status.
4.1 AC Load Simulation
There are two kinds of AC mode: Constant Load modes and Rectified Load Modes are shown
as
Figure 3-1 . The detail of Constant Load Modes is divided into three sub-modes of CC, CR
and CP modes. The detail of Rectified Load Modes is divided into three sub-modes of RLC,
CP (base on RLC mode) and Inrush Current modes. The parameters measured are described
separately as follows.
CAUTION