TWP-W151 DC ammeter refitting tester Introduction: Pointer type DC ammeter and voltmeter are refitted from the meter head. The meter head is usually a magnetoelectric galvanometer, which only allows the current to pass through the micro ampere level or milliampere level, and generally can only measure very small current and voltage. In actual use, if you want to measure a large current or voltage, you must modify it to expand its range. The modified meter shall be calibrated with a standard meter and its accuracy level shall be determined. This instrument provides a complete set of experimental equipment to convert a microammeter into a milliammeter or a voltmeter. The experimental content is rich, the concept is clear, stable and reliable, and the structure design is reasonable. It can be mainly used for the physical expansion experiment of middle school students or the general physical experiment of colleges and universities, as well as the design experience. Experiment items: 1. Understand the basic structure and usage of magnetoelectric DC ammeter; 2. Learn the method of expanding the range of ammeter, and understand the refitting principle of multimeter; 3. Learn the calibration method of electricity meter. Technical parameters: 1. DC stabilized voltage power supply: 1.5V and 5V; 2. Magnetoelectric DC microammeter: measuring range 0-100uA, internal resistance about 1.7k Ω, accuracy class 1.5; 3. Digital voltmeter: measuring range 0-1.999V, resolution 0.001V; 4. Digital ammeter: double range can be switched (note that the internal resistance of ammeters with different ranges is different); Measuring range: 0-1.999mA, resolution: 0.001mA; Measuring range 0-199.9uA, resolution 0.1uA; 5. Resistance box: resistance range 0-99999.9 Ω, resolution 0.1 Ω; 6. Multi turn potentiometer: 0-33k Ω continuously adjustable.
Introduction: Pointer type DC ammeter and voltmeter are refitted from the meter head. The meter head is usually a magnetoelectric galvanometer, which only allows the current to pass through the micro ampere level or milliampere level, and generally can only measure very small current and voltage. In actual use, if you want to measure a large current or voltage, you must modify it to expand its range. The modified meter shall be calibrated with a standard meter and its accuracy level shall be determined. This instrument provides a complete set of experimental equipment to convert a microammeter into a milliammeter or a voltmeter. The experimental content is rich, the concept is clear, stable and reliable, and the structure design is reasonable. It can be mainly used for the physical expansion experiment of middle school students or the general physical experiment of colleges and universities, as well as the design experience.
