AS8228 datasheet(30/123 Pages) AMSCO

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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

(

can be used, but Ni is calculated using the Target Pulse Rate:

Rate

Pulse

arg

)

ref

(

(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

[]

800

204

600

000

⇒

When a special pulse rate is required, the following formula applies:

[]

etPulseRat

arg

PulseRate

LED

800

204

600

000

⇒

Example:

Assuming a pulse rate of 1,000 is required:

1,600

→ 204,800

1,000

→ 204,800 x 1,000/1,600

[ ]

600

000

800

204

600

000

⇒

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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