Assembling the voltage and current meter experiment

Experiment 15

DC digital voltmeter with a measuring range of 200mV

Assemble multi-range DC voltmeter and DC ammeter

【Purpose requirement】

1. Understand the composition principle of digital multimeter;

2. Assemble a multi-range DC voltmeter and DC ammeter with a DC digital voltmeter with a range of 200mV.

【Experimental Principle】

Digital multimeter has strong functions and many measuring ranges. It is composed of various converters based on DC digital voltmeter. Based on the minimum range of the DC voltmeter, the current-voltage converter, resistance-voltage converter, and AC-DC converter convert the measured signal into a DC voltage signal, thus forming a digital multimeter.

【Experiment content】

1. Take the DC voltage range of 200mV (the internal resistance is greater than 10MΩ, which can be regarded as infinity) of the digital multimeter as the basic range. Assemble the DC voltage meter with a range of 2V and 20V respectively. The internal resistance of the DC voltage meter is required to be 100kΩ .

2. Assemble the digital multimeter's DC voltage range of 200mV (the internal resistance can be regarded as infinity) into a DC ammeter with a range of 200uA, 2mA and 20mA.

【Instruments】

Serial number

equipment name

Model / Specification

Unit price (yuan)

Remarks

1

Digital multimeter design experiment instrument

DH6505

3200

2

4-digit digital multimeter

DY2106

290

Compatible with other experiments