Spot Reflecting Galvanometer
Applications : Spot Galvanometer finds extensive use as a D.C. null detector in wheat stone bridges and potentiometers. Mains feed: It is a ‘mains’ operated instrument but can operate on a 6 volt battery also. There is provision to operate this instrument can be operated on both as well as main supply 220 volts, 50Hz or 6 Volt Capacity. Light Source: The light Source is 6 Volt and 0.3Amp bulb giving a bright spot on the scale.
Construction : The galvanometer has built in lamp and scale arrangement and housed in a bakelite case. The highly sensitive moving coil system is suspended in a taut band manner in a uniform field of permanent magnet.
Scale : The scale is 150mm long and is marked for both centre and end zero use. Zero Adjustment : The spot of light can be set at any point on the scale with the help of zero adjusting knob.
Sensitivity Control : The sensitivity is controlled by a 2-pole, 6 way switch. The switch Positions are D, 1/10, 1/100, 1/1000 and s/c Working Voltage : 220 VAC Time Period : 2 seconds
Technical Data : Dimensions: 220x 225x 132 mm (Approx.) Galvanometer Critical Damping Sensitivity
Resistance Resistance Voltage In ohms
a) 100 ohms 1000 ohms 0.04 to 0.05 mA per mm deflection
b) 600 ohms 7000 ohms 0.04 mA per mm deflection