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AS8218 Datenblatt(PDF) 28 Page - ams AG

Teilenummer AS8218
Bauteilbeschribung  Highly Integrated Single Phase 2 Current Energy Metering Integrated Circuits
PDF  123 Pages
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Hersteller  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS8218 Datenblatt(HTML) 28 Page - ams AG

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Data Sheet AS8218 / AS8228
Revision 3.0, 31-May-06
Page 28 of 123
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 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:
Reference
Meter
AS82xx
I
Pulse Counter
led
IO1
PC
Figure 4:
Basic setup for comparison calibration method (using IO1 as example input)
Note: An I/O used as push-button input can be used for the input of the reference meter pulses during
calibration.
The standard or reference meter pulses are counted between two pulses from the meter to be calibrated.
Ideally the sum of the pulses would exactly be the ratio between standard meter or reference pulse rate and
the pulse rate of the meter under test. From the deviation the corrected Pulse_lev may be calculated.
Na
Ni
)
ideal
(
lev
_
Pulse
)
corrected
(
lev
_
Pulse
×
=
,
where Ni is the ideal number of pulses
and Na is the actual number of pulses
(PCNT register in MPIO).



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