How to choose a home multimeter, take a look at a few details
1. Basic requirements
Household multimeters require appropriate accuracy, stability, reliability, economy and durability, portability, and affordable prices.
2. Type range
You can choose MF40, MF41, MF30, MF72 and other pocket multimeters, which can be used to measure capacitance, inductance and the amplification factor β value of transistors.
The MF30 type is a multimeter with higher sensitivity, and the MF72 type is suitable for repairing TVs, radios, etc.
High-sensitivity multimeters mainly include the 500 type. The disadvantages are that they are large, bulky, and have high accuracy.
MF15 and MF16 models also have relatively high sensitivity and small size. This type of multimeter is often purchased by families.
3. Digital multimeter
The characteristics of digital multimeters are very high sensitivity, complete functions, intuitive display, good reliability, low power consumption, small size and light weight. Commonly used ones include DT-830 type, etc. Its range switch can complete the selection of test function and range at the same time.
4. Key points for purchasing
When purchasing a multimeter, first observe whether the case is smooth and shiny, without scratches or cracks, and the scales on the dial are clear, clean, and free of stains.
Then, turn the switch down to see if it is light and flexible, with no jamming or noise. You can also shake the multimeter horizontally a few times. The pointer should have good damping, the swing should not be too large, and there should be no knocking sound in the meter.
Check the mechanical zero adjustment (the corrector is in the middle of the surface) to see if the pointer can cross zero and whether it can be accurately adjusted to the zero point.
Finally, check the ohm level of the battery on the meter: short-circuit the two test leads, turn the zero-adjusting potentiometer forward and reverse, the pointer should swing back and forth at "0" Ω, and can be accurately adjusted to the zero position.
In addition, you can also check the product performance according to the instructions to see if it meets the specified technical requirements.
