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4.
Measurements
The Load measures current, voltage, and peak current of the UUT. The maximum sampling
rate of the ADCs for the voltage and current measurements is about 200,000 samples per
second (200 kSPS). Voltage and current measurements are performed with 16-bit resolution
of full-scale ratings. Through the detected data of the voltage and current, true power, reactive
power, apparent power, frequency, PF, CF, and Voltage THD are calculated by DSP. As well,
peak detection of the current is utilized the same ADC.
The definitions of the measuring values are given below:
True Power (P)
Displays the true power consumed by the load and computed as:
where T represents the period of voltage, v and i represent instantaneous voltage and
instantaneous current separately.
Apparent Power (S)
Displays the apparent power consumed by the load and computed as:
V
where
and
rms
separately.
Reactive Power (Q)
Displays the reactive power consumed by the load and computed as:
Voltage (V)
V displays the root mean square value of voltage and computed as:
Current (I)
I displays the root mean square value of current and computed as:
1
∫
T
=
W
T
0
=
S
I
represent the root mean square values of voltage and current
rms
=
Q
=
V
=
I
v
*
idt
∗
V
I
rms
rms
−
2
2
S
P
1
∫
T
2
v
dt
T
0
1
∫
T
2
i
dt
T
0
Measurements
4-1
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