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78M6610+PSU Data Sheet
2.2
Current and Voltage RMS Calculations
N
N
The 78M6610+PSU provides true RMS measurements for both current and voltage inputs. The RMS is
obtained by performing the square sum of the instantaneous samples of voltage and current over a time
interval (commonly referred as accumulation time) and then performing a square root of the result after
dividing by the number of samples in the time interval.
n=0 n=0 2 2
???????? = ? ∑ N?1 Vn 2 ???????? = ? ∑ N?1 In 2
i
X
N-1
∑
N
X
Irms
n=0
IrOff
V
X
N-1
∑
N
X
Vrms
n=0
VrOff
Figure 6: RMS Calculations
10
Rev 1
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