EA 2239 10ma milliamperemeter
The Ea223910ma milliamperemeter — the device for measurement of current in amperes. The scale of ampermeters is graduated in microamperes, milliamperes, amperes or kiloamper according to limits of measurement of the device.
The ampermeter turns on in an electric chain consistently with that site of an electric chain in which current is measured. Therefore, the internal resistance of the ampermeter is lower (ideally — 0), the less there will be an influence of the device on the studied object, and the measurement accuracy will be higher. For increase in a limit of measurements the ampermeter is supplied with the shunt (for chains of direct and alternating current), the current transformer (only for chains of alternating current) or the magnetic amplifier (for chains of a direct current). It is very dangerous to try to use the ampermeter as the voltmeter (to connect it directly to the power supply): it can lead to short circuits!