BL0921

BL0921

BL0921

BL0921

http://www.belling.com.cn

- 4 -

3/15/2007

Total 13 Pages

Single Phase Energy Meter IC

Single Phase Energy Meter IC

Single Phase Energy Meter IC

Single Phase Energy Meter IC

with Integrated Oscillator

with Integrated Oscillator

with Integrated Oscillator

with Integrated Oscillator

10 Gain Error Match

Pin14

0.2

1

%

TERMINOLOGY

1) Measurement Error

The error associated with the energy measurement made by the BL0921 is defined by the

following formula:

%

100

0921

Re

×

−

=

Energy

True

Energy

True

BL

the

gisteredby

Energy

Error

Pencebtage

2) Nonlinear Error

The Nonlinear Error is defined by the following formula:

eNL%＝[(Error at X-Error at Ib) / (1+Error at Ib )]*100%

When V(v)=

±110mV, cosϕ=1, over the arrange of 5%Ib to 800%Ib, the nonlinear error should be

less than 0.1%.

3) Positive And Negative Real Power Error

When the positive real power and the negative real power is equal, and V(v) =

±110mV, the test

current is Ib, then the positive and negative real power error can be achieved by the following

formula:

eNP%=|[(eN%-eP%)/(1+eP%)]*100%|

Where: eP% is the Positive Real Power Error, eN% is the Negative Real Power Error.

4) Phase Error Between Channels

The HPF (High Pass Filter) in Channel 1 has a phase lead response. To offset this phase response

and equalize the phase response between channels, a phase correction network is also placed in

Channel 1. The phase correction network matches the phase to within ±0.1°over a range of 45

Hz to 65 Hz and ±0.2°over a range 40Hz to 1KHz.

5) Gain Error

The gain error of the BL0921 is defined as the difference between the measured output frequency

(minus the offset) and the ideal output frequency. It is measured with a gain of 1 in channel V1.

The difference is expressed as a percentage of the ideal frequency. The ideal frequency is obtained

from the BL0921 transfer function.

6) Gain Error Match

The gain error match is defined as the gain error (minus the offset) obtained when switching

between a gain of 1 and a gain of 16. It is expressed as a percentage of the output frequency

obtained under a gain of 1. This gives the gain error observed when the gain selection is changed

from 1 to 16.

7) Power Supply Monitor

BL0921 has the on-chip Power Supply monitoring The BL0921 will remain in a reset

condition until the supply voltage on VDD reaches 4 V. If the supply falls below 4 V, the BL0921

will also be reset and no pulses will be issued on F1, F2 and CF.