71M6533G Maxim, 71M6533G Datasheet - Page 78

• Manufacturer Part Number: 71M6533G
• Description: The Teridian™ 71M6533 and 71M6534 are third-generation polyphase metering systems-on-chips (SoCs) with a 10MHz 8051-compatible MPU core, low-power RTC, flash, and LCD driver
• Manufacturer: Maxim

•
•
•
•
The metrology section can be calibrated using the gain and phase adjustment factors accessible to the
CE. The gain adjustment is used to compensate for tolerances of components used for signal conditioning,
especially the resistive components. Phase adjustment is provided to compensate for phase shifts
introduced by the current sensors or by the effects of reactive power supplies.
Due to the flexibility of the MPU firmware, any calibration method, such as calibration based on energy, or
current and voltage can be implemented. It is also possible to implement segment-wise calibration (depending
on current range).
The 71M6533 and 71M6534 supports common industry standard calibration techniques, such as single-
point (energy-only), multi-point (energy, Vrms, Irms), and auto-calibration.
4.14 Meter Calibration
Once the Teridian 71M6533 and 71M6534 energy meter device has been installed in a meter system, it
must be calibrated. A complete calibration includes the following:
78
Calibration of the metrology section, i.e. calibration for tolerances of the current sensors, voltage dividers
and signal conditioning components as well as of the internal reference voltage (VREF).
Establishment of the reference temperature (Section 3.2) for temperature measurement and temperature
compensation (Section 3.5).
Calibration of the battery voltage measurement (Section 1.5.9).
Calibration of the oscillator frequency (Section 1.5.3) and temperature compensation for the RTC
(Section 4.1.3).
Rev 2