Fast digital calibration procedure

AN2299

12/26

Rev2

The first interface port should be dedicated to communication with the energy meter under

calibration (EM).

If EM does not have some Automatic Meter Reading (AMR) capability, a SPI to RS232C

interface must be located between CPC and EM.

There are some RS232C ports that could be optional in the following conditions:

●

if only calibration is required, the EMp and "precision" port can be omitted but Ip current

path must not be broken,

●

if Gen unit is accurate enough (< ±0.05%), the RMS meters M1 and M2 and

3.2

Calibration flow chart

The calibration procedure can be summarized in the following steps, which will be

examinated in section 3.3:

Figure 4.

Calibration flow chart

1. Working point setting

2. Algorithm choice

3. Offline parameters calculations

4. Online procedure

5. Coherency check