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參數(shù)資料
| 型號： | SA9109BFA |
| 廠商： | SAMES |
| 元件分類： | 電能質(zhì)量分析儀 |
| 英文描述： | MONOCHIP SINGLE PHASE BIDIRECTIONAL KILOWATT HOUR METERING IC |
| 中文描述： | MONOCHIP單相雙向千瓦小時計量IC |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 183K |
| 代理商： | SA9109BFA |
SA9109B
10/18
sames
Offset Adjustment
The precision of this device does not require any offset adjustment for Class 1
metering. This facility has been provided to compensate for poor PCB layout or
circumstances requiring precision well beyond a Class 1 rating.
The offset of the device may be adjusted by programming a different offset into the
device during calibration. To calculate the offset the following procedure should be
followed:
Measure the linearity error at the current where offset correction is needed.
K
O
= I
M
* E
RR
I
R
* 6 * 10
-6
Where
I
M
= Measured current on the current sensor
I
R
= Rated current on the current sensor
E
RR
= Error ratio between the device and the Wh standard
K
O
= Offset constant (-127 ...127)
(The default value is 0)
Note that K
O
must be programmed as a integer value.
Meter/Manufacturers Identification Data
A total of eleven 4 bit words are available to store relevant data such as the meter
and manufacturer identification codes. For the optical interface protocol, the 4-bit
words are converted to 8-bit words (ASCII-format).
Display resolution
From the above formula for f
P
it can be derived that the slope constant, Ks, is given
by the following expression:
K
S
= 626 * 3600 * 1000 * E
kWL
V
L
* I
L
Where
E
kWh
V
L
I
L
= energy for 1 display increment in kWh
= rated line voltage
= rated line current
This formula is valid only if 16μA
flows into the current sense input for rated line
current (I
L
) and 14μA
RMS
flows into the voltage sense input for rated line voltage (V
L
).
Writing to RAM
The memory is configured as ten 32 bit words. The programming data must be
written to the device as a bitstream containing a total of 320 bits. ROM-locations
will not be overwritten.
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