The 90E24 is a high-performance energy metering device for single-phase two-wire, single-phase three-wire or anti-tampering active and reactive energy meters. With the measurement function, the 90E24 can also be used in power instruments which need to measure voltage, current, etc.

  Fully compliant with IEC standard IEC62052-11, IEC62053-21 and IEC62053-23

  Applicable to class 1 or class 2 single-phase watt-hour meter or class 2 single-phase var-hour meter

  Accuracy of 0.1% for active energy and 0.2% for reactive energy over a dynamic range of 5000:1

  Temperature coefficient is 15ppm/°C (typical) for on-chip reference voltage

  Electrical parameters measurement: less than ±0.5% fiducial error for Vrms, Irms, mean active/reactive/apparent power, frequency, power factor and phase angle

  Dedicated ADC and different gains for L line and N line current sampling circuits

  Current sampled over shunt resistor or current transformer (CT)

  Voltage sampled over resistor divider network or potential transformer (PT)

  Programmable L line and N line metering modes

  Anti-tampering mode (larger power)

  L line mode (fixed L line)

  L+N mode (applicable for single-phase three-wire system)

  Flexible mode (configure through register)

  Voltage channel (when gain is '1'): 120µVrms~600mVrms

  L line current channel (when gain is '24'): 5µVrms~25mVrms

  N line current channel (when gain is '1'): 120µVrms~600mVrms