User's Manual

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 a SchlumbergerSema

Application Specific Integrated Circuit (ASIC) to improve reliability and reduce

cost.

hall

V=out GIV GPower==

Where G C R⁄()K=