LEEM-21 Digital Multimeter Assembly Experiment

Short Description:

The instrument explains the working principle of the three-and-a-half-digit analog-to-digital conversion chip ICL7107, and how to measure basic physical quantities such as voltage, resistance, and current values, and uses voltage dividers, shunts and binning resistors to measure voltage, resistance, and current values. Range extension design experiment, design and measure the hFE value of the triode and the forward voltage drop value of the diode.

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Main technical parameters
1. Resistance range: 200Ω, 2KΩ, 20KΩ, 200KΩ, 2MΩ;
2. Current range: 200μA, 2mA, 20mA, 200mA, 2A;
3. Voltage range: 200mV, 2V, 20V, 200V, 1000V;
4. With AC/DC conversion circuit, diode and triode measuring circuit;
5. Contains three and a half digits modified meter head, voltage divider, shunt, protection circuit and other parts;
6. DC power supply: 0～2V, 0.2A; 0～20V, 20mA;
7. Metal case design, AC 220V power supply.

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Multimeter assembly experiment