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Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 27 of 123

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power samples

Add power

sample to accu

Generate pulse

Accu>

threshold

defined by

pulse_lev?

The Fast Pulse Gen output pulse rate always has the same relationship with the LED pulse rate defined by

mconst. Only if LED is calibrated to a meter constant different from those provided in the mconst table, will the

fast internal pulse rate be different.

Formula for fast internal pulse rate (PRint):

[]

kWh

mconst

Rate

Pulse

arg

800

204

where mconst is the meter constant.

[]

600

000

int

when 1i is one impulse representing an energy equivalent.

Active Power Calibration (Pulse_lev)

This paragraph describes how the active power measurement within the AS8218 / AS8228 ICs is calibrated.

The parameter Pulse_lev is the main parameter which determines the output frequency of the Fast Pulse Gen.

This frequency relates to the measured power and is the basis from which the output pulse rate is derived.

Prior to system calibration, the appropriate value for the parameter Pulse_lev must be calculated to produce

the required output pulse rate. The calibration exercise must accommodate all non-idealities that are present in

the meter system.

The Pulse_lev is specified such that a typical pulse rate of 204,800i/kWh can be achieved.

During energy pulse calibration the correct Pulse_lev is determined in order to get the desired pulse rate.

The default value for Pulse_lev is defined for Imax=40A and Vmains=230V.

Default Pulse_lev: 570,950

Example for Pulse_lev calculations:

)

default

(

lev

Pulse

230

)

ideal

(

lev

Pulse

max

mains

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