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首页五位半台式万用表原理图.pdf
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5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
Block Diagram
Front
Terminals
Function
Switch
(Relay)
9.9M 100K
High Volts Divider
Current shunt
Function
Switch
(Analog switch)
Constant
Current source
DC Amplifier
Voltage
Reference
ADC
AC Amplifier
RMS to DC
Converter
Comparator
Divider
FPGA
(EP4CE6)
MAIN MCU
(STM32F407)
SPI
EEPROM
I2C
SRAM
(512Kx16)
Interface Port
LCD
Key
VMC
Ext Trig
Transfer
-15V +15V +5V
OPTO-
COUPLER
OPTO-
COUPLER
+18V
POWER MANAGE
(STC15F100)
NAND FLASH
(1GB)


















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