The only thing you may be missing is that these blocks may be something
other than brass. Brass has a temperature coefficient of resistivity of
0.1% to 0.2% per degree C at room temperature depending on the proportions
of copper and zinc. There are many materials that are more stable, some by
orders of magnitude. Check your handy-dandy copy of the "rubber bible".
Don Borowski
Schweitzer Engineering Labs
Gary McInturff
<GMcInturff@spray
cool.com> To
Sent by: "'Price, Ed'" <[email protected]>,
owner-emc-pstc@ma "'EMC PSTC'" <[email protected]>
jordomo.ieee.org cc
Subject
02/17/04 01:10 PM RE: DC Current Probes
Please respond to
Gary McInturff
<GMcInturff@spray
cool.com>
I was wondering the same thing. You can get brass blocks that drop mV per
lots of amps linearly. They come in different sizes and offer almost no
impedance at DC or higher freq's. DVM's or O-scopes are hooked in parallel
with the blocks and the small voltage drop monitored. They handle lots of
power and are pretty cheap.
Am I missing something (again?)
Gary
From: Price, Ed [mailto:[email protected]]
Sent: Tuesday, February 17, 2004 7:52 AM
To: 'EMC PSTC'
Subject: RE: DC Current Probes
>-----Original Message-----
>From: Finlayson Joseph-G3162C [mailto:[email protected]]
>Sent: Tuesday, February 17, 2004 5:54 AM
>To: 'EMC PSTC'
>Subject: DC Current Probes
>
>
>
>Group,
>
> I am looking to source a DC current probe to measure
>steady state as well as inrush currents for a modular chassis
>up to 100 Amps DC.
Joe:
Do you REALLY need a current probe? Can't you do this with a resistive
shunt
and an oscilloscope, using either differential inputs or simply floating
the
scope?
That said, some of the widest bandwidth current probes (like 3 dB down at 5
Hz, very flat response, 1% accuracy) are available from Pearson
Electronics:
http://www.pearsonelectronics.com/ . Unfortunately, I don't know of a 100
Amp DC current sensor; all the Tek or HP probes (Hall effect or
magnetoresistive) that I've seen are limited to about 6 Amps or so.
Ed
Ed Price
[email protected] WB6WSN
NARTE Certified EMC Engineer & Technician
Electromagnetic Compatibility Lab
Cubic Defense Applications
San Diego, CA USA
858-505-2780 (Voice)
858-505-1583 (Fax)
Military & Avionics EMC Is Our Specialty
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