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Model: SD-C670A DC Ammeter
Model: SD-C670V DC Voltmeter
Accuracy class: 2.5.
For through current: 100uA 200uA 300uA 500uA 1mA 5mA 10mA 20mA 4-20mA 50mA 100mA 200mA 300mA 500mA 1A 2A 3A 5A 6A 10A 15A 20A 25A 30A.
For transformeter ratio: 5A 10A 15A 20A 25A 30A 40A 50A 60A 75A 100A…10KA. The meters should be used with a shunt of which external secondary voltage 60mV or 75Mv.
Overload rate of ammeters: ①non-overload ②1.2 times
For thourgh voltage: 50mV 60mV 75mV 100mV 200mV 300mV 500mV 1V 5V 10V 30V 50V 100V 150V 200V 300V 400V 500V 600V.
For transformeter ratio: 450V 500V 600V 1000V 1500V 2000V 3000V 5000V. The meters should be used under the circumstance of 5mA incoming rated current and with an external fixed resistor.
Overload rate of voltmeters: ①non-overload
Product performance: All the meters are equipped with pure white silk-screen printing dial scale. The movement is made of aluminum alloys and performant magnet steel so that it is vibration-resistant and heat-resistant. The case is made of transparent PMMA plastics, of which the resistant temperature can be up to 85℃. The base is made of PA66 or flame retardant PA66 plastics, of which the resistant temperature can be up to 120℃. The resistant voltage is higher than 2000V. The meter is easy to install with a iron bolt with a mat by tightening four corners so that it is of high immobility.
Principles of measurement and the fearures: Each magneto-electrial meter consists of permanent magnet steel and a moving coil with two tractive balance springs. When low current flows through the magnet coil and magnetic field appears, the pointer deflects with the movement of magnet coil. When the torque and the restoring torque keep a balance, the pointer on the moving iron with point to a scale mark, which is the measured valure.
The magneto-electrical meters can be merely used for DC measurement. The advantages are high accuracy and sensitivity, low power consumption and the uniform scale, as well as insensitivity to temperature and external magnetic field, while the disadvantage is the low overload capacity.
