Re: current measurement
- From: "Chris" <cfoley1064@xxxxxxxxx>
- Date: 7 May 2006 17:53:10 -0700
prad wrote:
how can we measure the current flowing in a circuit without using
ammeter
can we have to use a voltage to current convertor?
if so what are the possible solutions to do so?
regards
pradheep
Hi, Pradheep. The easiest way to measure current without an ammeter is
by measuring the voltage across a series resistor. This works well for
DC and AC (for higher frequencies, you have to get non-inductive
resistors). Accuracy is solely dependent on the precision of the
resistor and the accuracy of the voltmeter. This becomes rather
wasteful of power at higher currents.
Another way of measuring either AC or DC current is to use a Hall
effect sensor to measure the magnetic field, and from that infer the
current. Commercial hall effect current sensors are available which
can give you better than 2% accuracy from DC to about 10KHz. These
sensors generally are made to work on larger currents (more than an
amp).
If you are measuring AC current, you may also use a current
transformer. Accuracy can be better than 1%, and the current and
frequency range is usually specified by the manufacturer. Make sure
not to leave the secondary of the current transformer unterminated.
Good luck
Chris
.
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