Configuration schematic of galvanometer
Example of experiment results
(Click figure to enlarge)
Features
Comprehensive experiment content
Clear physical concepts
Stable and reliable experimental results
Thoughtful and practical configuration
Introduction
Pointer DC ammeters and voltmeters are constructed from galvanometers. A galvanometer is typically a magneto-electric type ammeter that can only handle microampere or milliampere currents, making it suitable for measuring very small currents and voltages. To measure larger currents or voltages, the galvanometer must be modified to extend its measurement range. Once modified, the meter must be calibrated using a standard meter, and its accuracy grade should be determined.
The LEEI-5 experimental apparatus includes all the necessary components and devices for constructing a milliampere meter or voltmeter. These include a DC power supply, a magneto-electric type microamp galvanometer, a resistance box, a digital voltmeter, a digital ammeter, and more.
By conducting experiments with this apparatus, students will:
1. Understand the basic structure and operation of a microamp galvanometer.
2. Learn how to extend a galvanometer's measurement range and grasp the principles of constructing a multimeter.
3. Master the calibration techniques for electric meters.
The instruction manual provides detailed experimental configurations, underlying principles, step-by-step instructions, and sample experiment results. For more information, please click on Experiment Theory and Contents to explore the apparatus further.
Main Specifications
| Description | Specifications |
| DC power supply | 1.5 V and 5 V |
| DC microamp galvanometer | measurement range 0 ~ 100 μA, internal resistance about 1.7 kΩ, accuracy grade 1.5 |
| Digital voltmeter | measurement range: 0 ~ 1.999 V, resolution 0.001 V |
Digital ammeter | two measurement ranges: 0 ~ 1.999 mA, resolution 0.001 mA; 0 ~ 199.9 μA, resolution 0.1 μA. |
| Resistance box | range 0 ~ 99999.9 Ω, resolution 0.1 Ω |
| Multi-turn potentiometer | 0 ~ 33 kΩ continuously adjustable |
Configuration schematic of galvanometer
Example of experiment results
(Click figure to enlarge)
