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AS8267 Datasheet(PDF) 29 Page - ams AG

No. de pieza AS8267
Descripción Electrónicos  Single-Phase 2-Current Energy Measurement Integrated Circuits with Microcontroller, RTC, Programmable Multi-Purpose I/Os
PDF  136 Pages
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Fabricante Electrónico  AMSCO [ams AG]
Página de inicio  http://www.ams.com
Logo AMSCO - ams AG

AS8267 Datasheet(HTML) 29 Page - ams AG

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Data Sheet AS8267 / AS8268
Revision 1.0, 19-Jun-07
Page 29 of 136
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 (Pulse_lev(default))
Example for Pulse_lev calculations:
)
default
(
lev
_
Pulse
I
A
40
V
V
230
)
ideal
(
lev
_
Pulse
max
mains
×
×
=
Vmains (V)
Imax (A)
Pulse_lev (ideal)
Notes
230
100
228,380
230
80
285,475
230
60
380,633
230
40
570,950
Default setting
230
20
1,141,900
230
10
2,283,800
240
100
218,864
240
80
273,580
240
60
364,774
240
40
547,160
240
20
1,094,321
240
10
2,188,642
Pulse_lev(ideal) = 230/Vmains x 40/Imax x 570,950
Comparison Calibration Method
The most common calibration method is the comparison of energy reading of the meter under test (MUT)
against a standard or reference meter. Normally, the standard, or reference meter has a considerably higher
pulse rate than the meter under calibration. Reference meter output pulses are then counted between
consecutive led pulses. To facilitate the calibration procedure, a pulse counter is provided in the MPIO block.
In this case, the absolute calibration time and the calibration current are not relevant for the calibration cycle.
The basic calibration setup is shown below:



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