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71M6511/71M6511H Demo Board User’s Manual
1.8.5 ADJUSTING THE KH FACTOR FOR THE DEMO BOARD
The 71M6511/6511H Demo Board is shipped with a pre-programmed scaling factor Kh of 1.0, i.e. 1Wh per
pulse. In order to be used with a calibrated load or a meter calibration system, the board should be
connected to the AC power source using the spade terminals on the bottom of the board. The current
transformers should be connected to the dual-pin headers on the bottom of the board.
The Kh value can be derived by reading the values for IMAX and VMAX (i.e. the RMS current and voltage
values that correspond to the 250mV maximum input signal to the IC), and inserting them in the following
equation for Kh:
Kh = IMAX * VMAX * 47.1132 / (In_8 * WRATE * N ACC * X) = 0.99967 Wh/pulse.
Where IMAX is the current scaling factor, VMAX is the voltage scaling factor, In_8 is the current shunt gain
factor, WRATE is the CE variable controlling Kh, N ACC is the product of the I/O RAM variables PRE_SAMPS
and SUM_CYCLES , and X is the pulse frequency factor derived from the CE variables PULSE_SLOW and
PULSE_FAST .
The small deviation between the adjusted Kh of 0.99967 and the ideal Kh of 1.0 is covered by calibration.
The default values used for the 71M6511/6511H Demo Board are:
WRATE:
IMAX:
VMAX:
1556
208
600
In_8:
N ACC :
X:
1
2520
1.5
(controlled by IA_SHUNT = -15)
Explanation of factors used in the Kh calculation:
WRATE:
IMAX:
VMAX:
In_8:
N ACC :
X:
The factor input by the user to determine Kh
The current input scaling factor, i.e. the input current generating 177mVrms at the IA/IB
input pins of the 71M6511. 177mV rms is equivalent to 250mV peak.
The voltage input scaling factor, i.e. the voltage generating 177mVrms at the VA input pins
of the 71M6511
The setting for the additional ADC gain (8 or 1) determined by the CE register IA_SHUNT
The number of samples per accumulation interval, i.e. PRE_SAMPS * SUM_CYCLES
The pulse rate control factor determined by the CE registers PULSE_SLOW and PULSE_FAST
Almost any desired Kh factor can be selected for the Demo Board by resolving the formula for WRATE:
WRATE = (IMAX * VMAX * 47.1132) / (Kh * In_8 * N ACC * X)
For the Kh of 1.0Wh, the value 1556 (decimal) should be entered for WRATE at location 2D (using the CLI
command >]2D=+1556 ).
1.8.6 USING THE DEMO BOARD IN CURRENT SHUNT MODE
With a few quick modifications, the 71M6511/6511H Demo Board can be adapted to operate with a current
shunt/CT combination or a single shunt. Modifications are shown for the 2-Layer Demo Board. Com-
ponent references and configuration are slightly different for the 4-Layer Demo Board. Check the
schematic and PCB layout given for the 4-Layer Demo Board when applying the modifications.
Figure 1-9 shows the connections necessary for this operation mode. The voltage drop across the shunt
resistor is fed into the IA input of the 71M6511/6511H, with V3P3 being the reference. The voltage between
LIVE and NEUTRAL is divided by the resistor divider associated with the voltage input and supplied to the
VA input of the chip. The division ratio is so that the voltage at VA is within ±250mV of V3P3. The power
supply generates the 3.3VDC from the voltage between the shunt and the load, with “ground” being only
3.3V lower than the voltage at the load.
Page: 26 of 115
? 2005-2007 TERIDIAN Semiconductor Corporation
Revision 5.4
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