Catalogue No.
421
Spot Reflecting Galvanometer
BESTO' Spot Galvanometer finds extensive use as a D.C. null detector
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Applications: 'BESTO' 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, workable on 220 Volts AC, 50 Hz
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.
Dimensions : 220x 225x 132 mm (Approx.)
Working Voltage : 220 VAC
Time Period : 2 Seconds
Technical Data
| Galvanometer Resistance In ohms |
Critical Damping Resistance | SensitivityVoltage |
| 100 ohms | 1000 ohms | 0.04 to 0.05 mA per mm deflection |
| 600 ohms | 7000 ohms | 0.04 mA per mm deflection |