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Model: SD-T670A    AC Ammeter

Model: SD-T670V    AC Voltmeter

Accuracy class: 2.5.

For through current: 0.5A  1A  1.5A  3A  5A  10A  15A  20A  25A  30A  40A  50A

For transformation ratio: The meters should be used with a current transformer of which primary current is 10A 15A 20A 25A 30A 40A 50A 60A 75A 100A 120A 15…10KA and external secondary current 1A or 5A.

Overload rate of ammeters: ①non-overload ②1.2 times

For through voltage: 30V 50V 75V 100V 120V 150V 200V 250V 300V 400V 450V 500V 600V.

For transformation ratio: The meters should be used with a voltage transformer of which primary voltage is 400V 450V 500V 600V 1000V 1500V 2000V 3000V 500…450KV and external secondary voltage 100V.

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 high-performance magnetic materials 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 electromagnetic meter consists of a magnet coil with a static sheet iron inside and a moving sheet iron with a tractive balance spring. When current flows through the magnet coil, magnetic field appears. Under such circumstance, the static and the moving sheet irons are magnetized simultaneously and remain the same polarity. According to the theory that the same polarities repel each other, repulsive force between the two irons makes the pointer deflect. When the torque and the restoring torque keep a balance, the pointer on the moving iron will point to a scale mark, which is the measured value.

The electromagnetic meters can be used for AC circuits under ordinary circumstance as well as for DC circuits instructed with TRMS. The advantages are high accuracy, simple structure, and high overload capacity. And they can as well be used in 50 Hz/60Hz circuits. Special frequency should be marked out in ordering.