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User's Manual
Appendix 1 Symbol and Formula of Measurement
Measurement Function (Unit)
Voltage TRMS (Urms /V)
Voltage Calibrated Average Value (Umn /V)
Voltage DC Component (Udc /V)
Voltage AC Component (Uac /V)
Current TRMS (Irms /A)
Current Calibrated Average Value (Imn /A)
Current DC Component (Idc /A)
Current AC Component (Iac /A)
Active Power (P /W)
Instruments.uni-trend.com
Operation Formula
��
1
Urms =
2
⋅
��(��)
��
��=1
��
��
1
Umn =
| �� ( �� )|
x
⋅
��
2 2
��=1
��
1
Udc =
�� ( �� )
⋅
��
��=1
Uac = Urms
− Udc
2
2
��
1
Irms =
2
⋅
��(��)
��
��=1
��
��
1
Imn =
| �� ( �� )|
x
⋅
��
2 2
��=1
��
1
Idc =
⋅
�� ( �� )
��
��=1
Iac = Irms
− Idc
2
2
��
1
�� ( �� ) ∗ �� ( �� )
�� =
⋅
��
��=1
UTE310 Digital Power Meter
Explanation
u(n) represents the
instantaneous value of voltage.
i(n) represents the instantaneous
value of current.
N represents ADC sampling time
within the measurement range.
�� represents the phase difference
between the voltage and current.
96 / 99
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