18-06-2014, 12:03 PM
FREQUENCY METERS
FREQUENCY METERS.ppt (Size: 305.5 KB / Downloads: 16)
CLASSIFICATION
Mechanical resonance type
Electrical resonance type
Weston type
Moving iron type
Works on the changes in current in the parallel circuits
When the frequency changes - one coil is inductive and other one is non inductive-
Frequency is above the normal value- impedance of coil A increase-current reduced- Coil B stronger field- movement of spindle- right side