Quick Answer: Ballistic Galvanometer is designed for very low current measurement, with a mirror coil hung between a long suspension and a spring. It comes in 100 Ω and 500 Ω versions, both with a 12 sec time period.
Last updated: October 2026
Key Features
Designed for very low current measurement
Coil with mirror, suspended between a long upper suspension and a lower spring
Suspension and spring of special alloy for high sensitivity
Levelling screws for balancing the coil
Movement housed in a bakelite case
Two versions: 100 Ω and 500 Ω
Technical Specifications
Specification
100 Ω version
500 Ω version
Resistance
100 Ω
500 Ω
Time period
12 sec
12 sec
Charge sensitivity
300 mm/µC
600 mm/µC
Current sensitivity
1000 mm/µA
1400 mm/µA
Critical damping resistance
2000 Ω
3500 Ω
About This Product
Used as physics lab equipment where very small currents or charges are measured, this Lab Meters instrument gives its reading from the swing of the mirror on the suspended coil, with the levelling screws used to balance the coil first.
Frequently Asked Questions
Q1. How do the two versions differ? The 100 Ω version has a charge sensitivity of 300 mm/µC and current sensitivity of 1000 mm/µA; the 500 Ω version gives 600 mm/µC and 1400 mm/µA. Both have a 12 sec time period.
Q2. What is the critical damping resistance? It is 2000 Ω for the 100 Ω version and 3500 Ω for the 500 Ω version.
Beyond India, Lab Equipments Ambala ships to laboratories and education buyers in South Korea, the Gambia and Guinea.
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