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| 型号： | 71M6543F-DB-CT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 46/91页 |
| 文件大小： | 0K |
| 描述： | DEMO BOARD 71M6543F-DB-CT |
| 标准包装： | 1 |
| 系列： | * |
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DELTA _ T ? PPMC DELTA _ T 2 ? PPMC 2
2 14
2 23
71M6543 Demo Board User’s Manual
Let us assume that only linear components appear in the formula below, i.e. PPMC2 is zero.
GAIN _ ADJ = 16385 + +
We must now find the PPMC value that decreases GAIN_ADJ by 0.744% when DELTA_T is +600 ( DELTA_T
is measured in tens of °C). We find PPMC S to be:
PPMC S = 2 14 * (16263 – 16385) / 600 = -3331
2.3.3.2 Remote Sensor Reference Voltage
The compensation coefficients for the reference voltage of the three 71M6103 are derived automatically by the
Demo Code. Typical coefficients are in the range of +500 to -300 for PPMC 6X and -200 to -400 for PPMC2 6X .
2.3.3.3 Reference Voltage of the 71M6543 or 71M6543H
The compensation coefficients for the reference voltage of the 71M6543 are derived automatically by the Demo
Code. Typical coefficients are in the range of -200 to -400 for PPMC 4X and -400 to -800 for PPMC2 4X .
2.3.3.4 Voltage Divider
In most cases, especially when identical resistor types are used for all resistors of the voltage divider ladder, the
TC of the voltage divider will be of minor influence on the TC of the meter.
If desired, the voltage divider can be characterized similar to the shunt resistor as shown above. The difference
is that there is no individual GAIN_ADJ for each voltage channel. GAIN_ADJ0 is primarily intended to compen-
sate for the temperature coefficients of the reference voltage. If the TC of the voltage dividers is to be consid-
ered, it has to be calculated based on the average error of each phase.
Let us assume, applying 240 Vrms to a meter and recording the RMS voltage displayed by the meter at -40°C,
room temperature, +55°C, and at +85°C (when averaged over all phases), we obtain the values in the center
Table 2-3: Temperature-Related Error Sources
Temperature [°C]
-40
25
55
85
Displayed Voltage
246.48
246.01
245.78
245.56
Normalized Voltage
240.458
240.0
239.78
239.57
After normalizing with the factor 240/246.01 to accommodate for the initial error, we obtain the values in the
third column. We determine the voltage deviation between highest and lowest temperature to be -0.88 V, which
is equivalent to -3671 PPM, or -29.4 PPM/°C.
For this, we obtain a PPMC VD value of 788.
2.3.3.5 Combining the Coefficients for Temperature Compensation
After characterizing all major contributors to the TC of the meter, we have all components at hand to design the
overall compensation. If we examine only phase A for the moment, we find that we will need the following coef-
ficients for the control of GAIN_ADJn :
C S1 : The PPMC S = -3331 determined for the shunt resistor. PPMC2 S for the shunt resistor is 0.
C VD : The PPMC VD value of 788 determined for the voltage divider.
C 4X : PPMC 4X = -820 and PPMC2 4X = -680
C 6X : PPMC 6X = -620 and PPMC2 6X = -510
We will find that coefficients can simply be added to combine the effects from several sources of temperature
dependence.
Following this procedure, we obtain the coefficients for GAIN_ADJ0 (voltage measurement) as follows:
?
?
PPMC A = PPMC 4X + PPMC VD = – 820 + 788 = -32
PPMC2 A = PPMC2 4X + PPMC2 VD = -680 + 0 = -680
Page: 46 of 91
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| 71M6543FT-IGT/F | 制造商:Maxim Integrated Products 功能描述:ENERGY METER ICS - Rail/Tube |
| 71M6543FT-IGTR/F | 制造商:Maxim Integrated Products 功能描述:3-PHASE SOC, 64KB FLASH, PRES TEMP SENSOR - Tape and Reel |
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