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Hardware Description
2.1.2
Measurement of High Voltages
The circuit diagrams in the schematics section of Appendix A. “Schematics and Lay-
outs” , provide details on the resistor values used for dividing the network of the input
voltage. Table 2-3 provides a quick reference to resistor values in the high voltage sec-
tion.
TABLE 2-3:
RESISTORS FOR HIGH VOLTAGE MEASUREMENT
Register
R23 and R30
R24 and R31
R25 and R32
R33 and R35
R37 and R39
Value (K ? )
330
330
120
1
1
When measuring a high voltage signal on the input terminals of channels CH0 and
CH1, refer to Table 2-4 and Table 2-5. These tables provide the configuration of jump-
ers, along with the amplitude of the voltage available at the various points. The high
voltage can be in the universal range of input voltage ranging from 85-265 Volts rms
(Vrms) at 50 Hz or 60 Hz.
TABLE 2-4:
JUMPER SETTINGS FOR HIGH VOLTAGE MEASUREMENT ON CH0
CH0 Jumper Position
ADC
Voltage
(Vrms)
80
110
220
270
280
JP1
Short 1-2
Short 1-2
Short 1-2
Short 1-2
Short 1-2
JP2
Open
Open
Open
Open
Open
JP3
Open
Open
Open
Open
Open
JP4
Short
Short
Short
Short
Short
ADC I/P
(Vrms)
0.10230
0.14066
0.28133
0.34527
0.35806
ADC I/P
(Vpeak)
0.14468
0.19893
0.39786
0.48828
0.50637
Remark
Internal Gain of 2 can be used
for better resolution
Max Differential ADC I/P is 0.5V
TABLE 2-5:
JUMPER SETTINGS FOR HIGH VOLTAGE MEASUREMENT ON CH1
CH1 Jumper Position
ADC
Voltage
(Vrms)
80
110
220
270
280
JP8
Short 1-2
Short 1-2
Short 1-2
Short 1-2
Short 1-2
JP5
Open
Open
Open
Open
Open
JP6
Open
Open
Open
Open
Open
JP7
Short
Short
Short
Short
Short
ADC I/P
(Vrms)
0.10230
0.14066
0.28133
0.34527
0.35806
ADC I/P
(Vpeak)
0.14468
0.19893
0.39786
0.48828
0.50637
Remark
Internal Gain of 2 can be used
for better resolution
Max Differential ADC I/P is 0.5V
Note 1:
2:
3:
4:
5:
The precautions given need to be strictly adhered to, in order to avoid any damage to the evaluation
board and prevent electric shock hazard.
Input high voltage AC signal can be applied between pins 1 and 2 of the connector J4 or J5.
The resistors R26 and R27 should not be populated when pins 1 and 2 of J4 are connected to a high
voltage.
The resistors R28 and R29 should not be populated when pins 1 and 2 of J5 are connected to a high
voltage.
The resistors R26, R27, R28 and R29 can be used only when CT outputs are connected to the
connectors J4 and J5. In this case, these resistors act as a burden resistor to the CT secondary winding.
? 2011 Microchip Technology Inc.
DS51990A-page 13
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