AN2288

Meter hardware

13/29

factor will change to x8 or when upper half of sinewave after x8 increases after 1.015V, the

active gain factor will change to x2. The Irms will be:

The same logic applies with the x8 voltage multiplier. Below ~0.508V, the gain factor

increases to x32. At this level, when the voltage increases higher than 2.03V, the gain factor

drops back to x8. The Irms can be calculated (using just the upper half of the sinewave):

The same logic applies with the x32 voltage multiplier. Below ~0.508V, the gain factor

increases to x128. At this level, when the voltage increases higher than 2.03V, the gain

factor drops back to x32. The Irms can be calculated (using just the upper half of the

sinewave):

2Irms

×

R

shunt

x2

×

()

×

5000

------------------------------------------------------------------

0.253V

=

Irms

13.7

7.818

×

32.23

---------------------------------

3.32A

==

Irms

3.32

32.23

×

131.77

---------------------------------

0.81A

==