Datasheet

78M6610+PSU Data Sheet
2.2 Current and Voltage RMS Calculations
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.
=


Vn



N

=


In



N

Irms
N
X
i
∑
N-
1
n=0
Vrms
N
V
∑
N-1
n=0
X
IrOff
X
VrOff
X
Figure 2-3: RMS Calculations
Rev 3 11