2.PCB Size: 70.6*39mm
3.Display Window Size: 51*24mm
4.Operating Voltage: DC 5V
5.Operating Current: 35mA
6.Measurement Precision: +/-1mA
7.Measurement Range: 0-2A
8.Overrange Display: the first bit displays 1 or -1
9.Display Color: Red
|Metal Film Resistor||0.1 ohm/2W||R5||1|
|Metal Film Resistor||2K ohm||R1,R9||2|
|Metal Film Resistor||56K ohm||R2||1|
|Metal Film Resistor||1M ohm||R6||1|
|Metal Film Resistor||100 ohm||R3||1|
|Metal Film Resistor||270 ohm||R10||1|
|Metal Film Resistor||20K ohm||R8||1|
|Metal Film Resistor||47K ohm||R7||1|
|Metal Film Resistor||100K ohm||R4||1|
|Digital Tube||1 bit Common Anode Red||DS1-DS4||4|
|Potentiometer||3296 1K ohm||VR1||1|
|Power Wire||2P Single Head||1|
AMM-TE ammeter is mainly composed of ICL7107, power circuit, reference voltage source,
input circuit and display circuit.
▲1. ICL7107 is a BCD output integral type A/D conversion chip, its internal includes ;linear amplification, analog switch,oscillation,display driving etc.
▲2. Power circuit is divided into positive power and negative power; positive power is input by J2,C8 filtering; negative is composed of R8,Q1,L1,C6,C7,D2,D3 and ZD1,and generate -5V voltage is input by chip 26th pin.
▲3. Reference voltage source is composed of R1,R2,VR1,R9 and U2;36-pin is reference voltage input pin; adjust VR1 potentiometer to let 36-pin voltage be 100mV.
▲4. Input circuit is composed of J1,R5,R6 and C3.When the current of measured circuit passes through R5, it will generate a voltage on R5;this voltage will be input to chip 31-pin through R6 current limiting and be processed; C3 is input voltage filtering capacitor.
▲5. Display circuit is composed of DS1-DS4,D1,D4;4 digital tubes can be drived directly by the chip, R10 is current limiting resistance of DS1-DS3 digital tubes decimal points.
Finished Product Debugging:
1. After connecting with DC 5V (please notice the polarity), the digital tube will display -.000 or .000,this is normal.
2. Use multimeter to measure the voltage between chip 36-pin and 35-pin,and adjust VR1 potentiometer let it be 100mV
Key Points Voltage Reference Value:
1.Chip 1-pin and 21-pin voltage 5V
2.Chip 36-pin and 21-pin voltage 100mV
3.Chip 26-pin and 21-pin voltage -5V
Warning: Considering respect the copyright of the partners, it is not allowed to use our pictures or videos without approval.
We are not responsible for any complaints from our partners if you used the pictures/videos arbitrarily.
I. Tested by ICStation's Outstanding Partner ELECTROJUANYU:
Learn More Details in the Video:
(The language in the video is Spanish)
II. Tested by ICStation's Outstanding Partner arduinoLab:
Learn More Details in the Video:
(The language in the video is Russian)
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