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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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STPM01 数据表(PDF) 49 Page - STMicroelectronics |
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STPM01 数据表(HTML) 49 Page - STMicroelectronics |
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49 / 56 page  STPM01 STPM01 Calibration 49/56 VDIV = (XV * VBG)/ (2 * GDIF * AV * Kv * GDF * GINT * BV)= 145,6 mV Choosing R2=500 Ω (connected between VI and VSS), the R1 resistor (connected between VLINE and VIP) value is obtained: R1 = R2 * (Vn - VDIV) / VDIV = 789,3 Ω Indicating with IA and VA the real readings on the STPM01 rms registers of voltage and current, and with XI and XV ideal values of RMS current and voltage readings already calculated, the final values for calibrators can be calculated as: XV = (Kv * VA) / 0.875 XI = (Ki * IA) / 0.875 If the computed final calibration data would fall out of calibration data range, the Energy Meter should be recognized as bad or the given presumptions and calculations above should be checked. Otherwise, if the final data of calibrators would be written into Energy Meter, the rms readings should be very close to target values I and V and the frequency of LED output should be very close to target value f. |
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