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SA9109B Datasheet(PDF) 10 Page - Sames |
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SA9109B Datasheet(HTML) 10 Page - Sames |
10 / 18 page 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. 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 * IL Where E kWh = energy for 1 display increment in kWh V L = rated line voltage I L = rated line current This formula is valid only if 16µA RMS flows into the current sense input for rated line current (I L) and 14µARMS flows into the voltage sense input for rated line voltage (VL). 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). 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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