71M6513H-DB【PDF 47/112 页】BOARD DEMO 71M6513H ENERGY METER

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71M6513/71M6513H Demo Board User’s Manual

Voltage

Current lags

voltage

Positive

(inductive )

direction

+60°

Current

-60°

Current leads

voltage

(capacitive )

Voltage

Generating Energy

Using Energy

Figure 2-2: Phase Angle Definitions

The calibration procedures described below should be followed after interfacing the voltage and current sensors

to the 71M6513/6513H chip. When properly interfaced, the V3P3 power supply is connected to the meter

neutral and is the DC reference for each input. Each voltage and current waveform, as seen by the

71M6513/6513H, is scaled to be less than 250mV (peak).

2.2.1 CALIBRATION PROCEDURE WITH THREE MEASUREMENTS

The calibration procedure is as follows:

1)

2)

3)

4)

5)

6)

7)

8)

9)

All calibration factors are reset to their default values, i.e. CAL_IA = CAL_VA = 16384, and PHADJ_A

= 0.

An RMS voltage V ideal consistent with the meter’s nominal voltage is applied, and the RMS reading

V actual of the meter is recorded. The voltage reading error Axv is determined as

Axv = (V actual - V ideal ) / V ideal

Apply the nominal load current at phase angles 0° and 60°, measure the Wh energy and record the

errors E 0 AND E 60 .

Calculate the new calibration factors CAL_IA, CAL_VA, and PHADJ_A, using the formulae presented

in section 2.1.1 or using the spreadsheet presented in section 2.2.4.

Apply the new calibration factors CAL_IA, CAL_VA, and PHADJ_A to the meter. The memory locations

for these factors are given in section 1.9.1.

Test the meter at nominal current and, if desired, at lower and higher currents and various phase

angles to confirm the desired accuracy.

Store the new calibration factors CAL_IA, CAL_VA, and PHADJ_A in the flash memory of the meter. If

the calibration is performed on a TERIDIAN Demo Board, the methods shown in sections 1.9.3 and

1.9.4 can be used.

Repeat the steps 1 through 7 for each phase.

For added temperature compensation, read the value in CE RAM location 0x54 and write it to CE RAM

location 0x11. If Demo Code 3.05 or later is used, this will automatically calculate the correction

coefficients PPMC and PPMC2 from the nominal temperature entered in CE location 0x11 and from

the characterization data contained in the on-chip fuses.

Tip: Step 2 and the energy measurement at 0° of step 3 can be combined into one step.

Page: 47 of 112

? 2005-2006 TERIDIAN Semiconductor Corporation

Revision 5.6

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