Výběr digitální multimetry
1. Basic DC voltage accuracy
Ty různé signály měřené v a digitální multimetr bude nakonec být převedeno do DC napětí typy pro měření skrz obvod.
2. čtení rozlišení
It refers to the effective reading resolution value that can be displayed on the digital meter screen, or it can be simply understood that the number of digits behind the Decimal separator can be displayed on the screen at most when measuring small signals. For example, a six and a half digit multimeter usually displays a value of six digits after the Decimal separator when measuring 1V voltage.
3. Měření typ
4. Signal measurement range
Měření rozsah z různé modely of digitální multimetr je jiné, for example, the Agilent 34401A current range is up to 3A. If I want to measure a current of 9A, I need to choose another model of digital multimeter. Please check the numerical range of the frequently measured data before making a selection.
5. Komunikace rozhraní
There are four main types of communication interfaces for digital meters: USB, GPIB, LAN, and RS232. Mainly used for communication between instruments and computers, facilitating the timely transmission, storage, and analysis of measurement data. For example, it is more convenient for us to choose a LAN interface when placing instruments far from the computer. If the instrument is very close and only needs to provide high-speed data transmission, then USB will be very convenient. If it is conducive to system bus control integration, then GPIB will be very convenient.
Bezpečnostní opatření pro použití:
1. When selecting the resistance gear, directly measure the voltage, and the multimeter will burn out.
2. Když sonda je připojeno k proud test port, measure the voltage of the obvod. Because the internal resistance of the current connection port is very small, it will short-circuit the circuit, and the short-circuit circuit will instantly generate a large amount of current flowing through the multimeter, causing the multimeter to burn out.
3. If the sonda is connected to the voltage test port to measure the current, the internal resistance of the Voltmetr is extremely large, and the multimeter will be connected in series to the circuit when měření the current.
