Black box experiment

Experiment 20 Black Box

【Purpose requirement】

1. Learn to distinguish components based on the characteristics of different types of electrical components;

2. Be further familiar with the use of oscilloscopes, signal generators, digital multimeters and other instruments;

3. Cultivate the ability to design test steps and comprehensive analysis and reasoning.

【Experimental Principle】

The black box is a sealed component box used in the experiment of judging electrical components. The components in the box may be: dry batteries, fixed resistance, capacitors, semiconductor diodes. The two terminals visible outside the box may also be open or short-circuited (that is, connected by wires). Each component is connected to the terminal, and at most one component is connected between the two terminals. The components are not connected in parallel circuits, so the distribution of components should be unique. During the experiment, the box must not be opened by itself. It is required to design the experimental scheme and detection steps to determine the components in the box.

【Instruments】

Serial number

equipment name

Model / Specification

Unit price (yuan)

Remarks

1

Dual Trace Analog Oscilloscope

MOS620CH / 20MHz

1800

Can choose one

Digital storage oscilloscope

TH1022A / 25MHz

2450

2

DC power supply

DH-VC1

900

Compatible with other experiments

3

Signal generator

DH-WG1

900

4

4 and a half digital multimeter

DY2106

290

5

Resistance box

ZX21

300

6

Sealing element box

150

Also known as black box

7

Switch, wire