- 1/2-Inch x 12-Feet Chrome Clad blade
- Ideal for industrial use
- Chrome plated case
- Hard chrome plated blade is tough and accurate
- Power retraction operation
List Price: $ 33.95
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Question by Fred: When measuring total current using a DMM and a power source, do I have to open the circuit somewhere?
Also, is it the same procedure for measuring current through a single resistor?
Thanks for your time and effort people!
Answer by Bony
Think CURRENT THROUGH
and VOLTAGE ACROSS.
Assume that you have a 1A load connected
to a DC output PSU.
To read the 1A current you must
arrange the circuit so that the
CURRENT flows THROUGH the DMM.
Connect the DMM in series with the limb of the
circuit whose current you wish to measure.
Set DMM mode switch to DC Amps, next range > 1A.
This means breaking/opening the circuit, usually
near the + terminal of a DC supply.
The ‘break’ leaves two circuit ends, connect your
DMM to these, keeping + of meter to + of supply.
Yes, same method as for measuring
current through resistor.
You may also learn about a grip or clamp-on
ammeter, which does not require circuit breaking,
which electromagnetically detects the
dc or ac current in a conductor.
By contrast voltmeters are connected
ACROSS circuit components to measure VOLTAGE.
No circuit opening is required. Easy to connect!
This is why most readings taken
in circuits are of voltage.
Know better? Leave your own answer in the comments!
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