Operation: Base Metrology
3-2 CENTRON Meter Technical Reference Guide
The output voltage of the Hall Effect device is then:
G is the combined gain factor of the entire system (Voltage to biasing current, line
Current to flux density, Hall sensor).
Figure 3.1 Power Measurement Principle in 2S
From the power information available at the output voltage of the sensor, the
meter architecture is simplified over previous designs as the multiplication has
already taken place (see Figure 3.2).
The Hall sensor output voltage is amplified by a differential amplifier in order to
bring the signal within the nominal level of the analog to digital converter (ADC).
The output of the ADC is integrated over time to get the energy information and
generates a pulse stream that is accumulated into a counter. When the
accumulated pulses reach a threshold set by meter calibration, a Wh pulse is
emitted and the meter LED is flashed. The counter threshold is programmed at the
factory and serves as the permanent gain calibration for the life of the product. The
calibration is a digital feature and has no variation or adjustment. All the
processing steps described above are integrated into an Application Specific
Integrated Circuit (ASIC) to improve reliability and reduce cost.
V
hall
V= out GIV GPower==
Where G C R⁄()K=
i
b
To Next Page
Loading...
