Usage, Types
and Safety
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Clamp Meters
What is a clamp meter and what can it do?
What measurements can be made with a
clamp meter?
How do you get the most out of a clamp
meter? Which clamp meter is best suited to
the environment the meter will be used in?
The answers to these questions can be
found in this Presentation.
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What is a clamp meter and what can it do? What measurements can be
made with a clamp meter?
In electrical and electronic engineering,
a current clamp or current probe is an
electrical device having two jaws which
open to allow clamping around an electrical
conductor. This allows properties of the
electric current in the conductor to be
measured, without having to make physical
contact with it, or to disconnect it for
insertion through the probe. Current clamps
are usually used to read the magnitude of
a sinusoidal current as invariably used
in alternating current (AC) power
distribution systems. Very high alternating
currents (1000 A and more) are easily read
with an appropriate meter; direct currents,
and very low AC currents (mill amperes) are
more difficult to measure.
Clamp Meters
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Types of Current Clamps
CURRENT TRANSFORMER
• A common form of current clamp comprises a split ring made of ferrite or soft iron.
A wire coil is wound round one or both halves, forming one winding of a current
transformer. The conductor around which it is clamped forms the other winding. Like
any transformer this type works only with AC or pulse waveforms, with some
examples extending into the megahertz range. When measuring current, the subject
conductor forms the primary winding and the coil forms the secondary.

Iron Vane
• In the iron vane type, the magnetic flux
in the core directly affects a moving iron
vane, allowing both AC and DC to be
measured, and gives a true RMS value
for non-sinusoidal AC waveforms. Due
to its physical size it is generally limited
to power transmission frequencies up to
around 100 Hz.
• The vane is usually fixed directly to the
display mechanism of an analogue
(moving pointer) clamp meter.
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What measurements can be made with a clamp meter?
Modern Clamp Meters are used for various
Measurements (Ranges dependent on
model selected) :
Current Measurements (AC or DC) ranges
from mA to A
Voltage Measurements (AC or DC) Ranges
from mV to V
Resistance Measurement
Continuity Testing
Frequency Measurement
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One of the most basic measurements of a
clamp meter is current. Today’s clamp
meters are capable of measuring both ac
and dc current. Typical current
measurements are taken on various branch
circuits of an electrical distribution system.
Determining how much current is flowing in
various branch circuits is a fairly common
task for the electrician.
Measuring Current with a Clamp Meter.
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Other Topics covered in this presentations
• How to make current measurements .
• Correct Way to Measure AC/ DC Current using Clamp Meter .
• How to measure DC Current .
• Using a Clamp Meter in a Difficult Situations.
• How to make resistance measurements.
• How to make voltage measurements.
• Safety Checklists and more
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Statistical Quality and Risk Assessment Solutions

SAFETY CHECKLIST
For safe operation and maintenance of the product:
Remove batteries to prevent battery leakage and damage to the Product if it is not
used for an extended period.
Be sure that the battery polarity is correct to prevent battery leakage.
Repair the Product before use if the battery leaks.
Have an approved technician repair the Product.
Do not operate the Product with covers removed or the case open. Hazardous voltage
exposure is possible.
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programs, statistical analysis for quality ( site QA/QC)
program and online audits please visit us on :
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