Explain working of Weston type frequency meter.
by

2 Answers

0 like 0 dislike

Working of Weston Type Frequency Meter:

image

The mounting and connections are shown in the figure. Inductor L damps the harmonics in the current. When connected across the supply, coils A and B draw currents to produce magnetic fields that act on the soft iron needle to deflect it. The position of the needle depends on these currents. Under normal frequency (due to proper selection of RA, RB, LA, LB, ) two forces make the pointer to show normal frequency. When the frequency is other than normal, the reactances of LA and LB will be different with resistances unchanged, leading to deflections in either direction depending on the currents there in, due to changed impedances.

by
0 like 0 dislike

Weston Type Frequency Meter: There are two fixed coils marked as A and B. Each coil divided into two equal parts and are fixed such that their magnetic axis are perpendicular to each other. At their center a soft iron needle is placed on spindle to which the pointer is attached. The mounting and connections are shown in the figure. Inductor L damps the harmonics in the current. When connected across the supply, coils A and B draw currents to produce magnetic fields that act on the soft iron needle to deflect it. The position of the needle depends on these currents. Under normal frequency (due to proper selection of RA, RB, LA, LB, ) two forces make the pointer to show normal frequency. When the frequency is other than normal, the reactances of LA and LB will be different with resistances unchanged, leading to deflections in either direction depending on the currents there in, due to changed impedances.

by

Related questions

1 answer
asked Mar 21, 2018 by Someone | 16 views
1 answer
3 answers
asked Mar 10, 2018 by Quiz | 279 views
1 answer
1 answer
1 answer
asked Mar 21, 2018 by Someone | 22 views
1 answer
0 answers
asked Oct 25, 2018 by Sai | 51 views
1 answer
asked Sep 8, 2018 by Someone | 19 views
2 answers
asked Sep 8, 2018 by Someone | 9 views
1 answer
asked Sep 8, 2018 by Someone | 4 views
1 answer
1 answer
2 answers
2 answers
0 answers
1 answer
1 answer
0 answers
asked 4 days ago by Doyel | 22 views