PIC18F87J72 Evaluation Board User’s Guide
TABLE 2-11:
JUMPER SETTINGS FOR CURRENT MEASUREMENT ON CH1
CH1 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
Note 1:
2:
3:
4:
The precautions given need to be strictly adhered to, in order to avoid any damage to the evaluation board
and prevent electric shock hazard.
I/P CT Secondary is connected between pins 1 and 3 of J4 and J5.
The resistors R26, R27, R28 and R29 need to be populated. These resistors act as burden resistors for
CT secondary.
The calculations given in Table 2-10 and Table 2-11 are true for a CT ratio of 1:2500 and a burden
resistance of 31.5( ? ).
DS51990A-page 16
? 2011 Microchip Technology Inc.
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