Ac Load Simulation - Chroma 63800 Series Operation & Programming Manual

Programmable AC/DC Electronic Load 63800 Series Operation & Programming Manual

Power factor (PF)
Displays the power factor of the load and computed as:

Crest factor (CF)
Displays the crest factor of current and computed as:
I
where represents the peak value of current.
PK

Impedance (R)
Displays the impedance of the load and computed as:

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:
V
where represents the fundamental component of voltage.
1 h
CAUTION
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.
4-2
P
PF =
S
I
CF =
PK
I
rms
V
R =
rms
I
rms
−
2 2
V V
=
rms h 1
THD
V
h 1