Description of functions and characteristics of analog multimeter
Analog multimeter
Analog multimeter is an instrument used to measure DC current, DC voltage, AC current, AC voltage, and resistance. It mainly consists of three parts: indicating part, measuring circuit and conversion device. Compared with digital multimeter, it is convenient and intuitive.
Analog multimeter features
1. Automatic measurement mode, high input impedance.
2. Voltage and resistance are automatically set to the most appropriate range.
3. Automatic polarity conversion.
4. 1-10Mω high input impedance.
5. Series capacitor input type.
6. No need for zero adjustment.
7. Built-in battery check function.
Analog multimeter features
There are generally four scale lines on the meter head of an analog multimeter, which represent resistance, voltage/current and level readings respectively.
The calibration of each level of the ohmmeter is based on the respective center resistance value. Therefore, when measuring resistance, the pointer should be displayed as close to the center of the scale as possible to reduce errors. The calibration of each gear of the ammeter and voltmeter is carried out based on their respective full-scale values. Therefore, the indication value of the pointer should be as close as possible to the full-scale value during measurement to reduce errors.
The measurement of level is actually achieved by AC voltage measurement. Therefore, although the level is defined by taking the logarithm of the power ratio, it can be converted into a measurement of voltage. Since the zero power level is the level when lmW power is obtained on a 600W load, then the voltage on the load at the zero power level, this voltage value is the zero level voltage.
The decibel scale on the dial corresponds to the lowest level of AC voltage (10V level).
