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Hardware Description
2.1.4
Measurement of Current Signals
The circuit diagrams in the schematics section of Appendix A. “Schematics and
Layouts” , provide details on the resistor values used for the current measurement
circuit. Table 2-9 provides a quick reference to resistor values while measuring the
current signals. The output of Current Transformers (CTs) can be connected to the
input connector pins.
TABLE 2-9:
RESISTORS FOR LOW VOLTAGE MEASUREMENT
Register
R26 and R28
R27 and R29
R34 and R36
R33 and R35
R37 and R39
R38 and R40
Value (K ? )
0.063
0.063
1
1
1
1
When measuring a current signal on the input terminals of channels CH0 and CH1,
refer to Table 2-10 and Table 2-11. These tables provide the configuration of jumpers,
along with the amplitude of the voltage available at the various points.
TABLE 2-10:
JUMPER SETTINGS FOR CURRENT MEASUREMENT ON CH0
CH0 Jumper Position
ADC
CT Primary
Current
(Irms-A)
0.1
0.5
1
10
20
30
JP1
Short 2-3
Short 2-3
Short 2-3
Short 2-3
Short 2-3
Short 2-3
JP2
Open
Open
Open
Open
Open
Open
JP3
Short
Short
Short
Short
Short
Short
JP4
Open
Open
Open
Open
Open
Open
ADC I/P
(Vrms)
0.00063
0.00315
0.0063
0.063
0.126
0.189
ADC I/P
(Vpeak)
0.00089
0.00445
0.00891
0.08910
0.17819
0.26729
Remark
Internal Gain of 2 can be used for
better resolution
Max Differential ADC I/P is 0.5V
? 2011 Microchip Technology Inc.
DS51990A-page 15
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