DC Analog Ammeter Model-0407

DC Analog Ammeter, Model: 0407, Origin: China is mostly used in the laboratories of schools, colleges, universities & polytechnics to measure the current intensity in DC circuits.

Technical Parameters of DC Analog Ammeter:

• The dial is at an angle of 40 degrees to the horizontal face.
• Reference Conditions: Ambient temperature 23ºC ± 2ºC; Relative humidity 40%∼60%
• Measuring Range: (-0.2~0.6A); (-1~0~3A).
• Accuracy: Class 2.5
• Dimensions: 133mmX97X100mm
• Damping Time: ≤ 4S.
• Magnetic Screening: Grade – III.
• Sensitivity: 75mV

Working Principle and Main Structure of This Ammeter:

DC Ammeter, Model: 0407, is mainly composed of the meter head and the meter shell. There are three terminals in the meter shell (“-“, “0.6A” and “3A” terminal). The meter head is a type of moving-coil instrument. It consists of permanent magnetic steel, pole pieces, soft iron core, and coil, etc. The coil which can rotate around its central axis is placed in the magnetic field. Two hairsprings are welded on both ends of the axle of the coil respectively. On one end the pointer is fitted. The dial and the zero adjusters are fixed on the support.

Use and Operation of DC Ammeter: 

Check and adjust the pointer to zero before using it. The meter first connects in series with the circuit under test. The “-” terminal is connected with a negative electrode. Estimate the current intensity in the circuit beforehand to avoid damage to the meter by overloading.

Maintenance and Precautions:

• The meter should be avoided bumping or vibrating violently and it should not be dismounted arbitrarily.
• Keep the meter clean and protect it from the invasion of corrosive gases and the influence of a strong magnetic field.
• The meter should be stored at an ambient temperature of 0ºC~40ºC and relative humidity ≤85%, and prevent it from dust, heat, and moisture.