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AS8218 数据表(PDF) 30 Page - ams AG

部件名 AS8218
功能描述  Highly Integrated Single Phase 2 Current Energy Metering Integrated Circuits
PDF  123 Pages
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制造商  AMSCO [ams AG]
网页  http://www.ams.com
标志 AMSCO - ams AG

AS8218 数据表(HTML) 30 Page - ams AG

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Data Sheet AS8218 / AS8228
Revision 3.0, 31-May-06
Page 30 of 123
If the target meter constant is different from one of the selectable (mconst) meter constants defined above:
e.g. 1,000i/kWh (Target Pulse Rate)
The same formula
)
mconst
(
Rate
Pulse
LED
)
ref
(
PR
Ni
=
can be used, but Ni is calculated using the Target Pulse Rate:
Rate
Pulse
et
arg
T
)
ref
(
PR
Ni
=
(Important: Select a pulse rate which is close to mconst, for the Target Pulse Rate, so that the Pulse_lev stays
within reasonable limits.)
After this calibration the energy equivalent of 1 fast pulse (1i) is different!
Standard: internal pulse rate: 204,800i/klWh
[]
Ws
58
.
17
800
,
204
Ws
600
,
3
000
,
1
i
1
=
×
=
⇒
When a special pulse rate is required, the following formula applies:
[]
Ws
e
etPulseRat
arg
T
PulseRate
LED
800
,
204
600
,
3
000
,
1
i
1
×
×
=
⇒
Example:
Assuming a pulse rate of 1,000 is required:
1,600
→ 204,800
1,000
→ 204,800 x 1,000/1,600
[ ]
Ws
13
.
28
600
,
1
/
000
,
1
800
,
204
Ws
600
,
3
000
,
1
i
1
=
×
×
=
⇒
Mains Current Leads/Lags Mains Voltage
The i_lead flag in the SREG/Status register determines if the mains current leads the mains voltage or lags the
mains voltage. The data is provided for reactive power calculation, to establish if the measured power is
capacitive or inductive.



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