[SI-LIST] Re: Using Current Probes to Measure Cable Resonance

 
Hi Ron,

Sounds something like a grid dip meter. I wrote an article about using a
griddip meter for this purpose July 2002. The link is:

http://emcesd.com/tt2002/tt070102.htm[1]

Although inexpensive, a live plot showing all the resonances and how they
move as things are changed is very useful.

Doug

ron@xxxxxxxxxxx[2] wrote: Hi Doug A simple way is to use an echo-box:- an
oscillator with a loop antenna tied into the tuning circuit with a meter
measuring the current in the oscillator with a fixed voltage source. As the
circuit is tuned, the resonances peak. The loop antenna is connected by a
dual banana plug so different bands loops can be inserted. Coupling is by
proximity of the loop so anything that resonates will show up on the current
meter and no physical connection is necessary. I havent seen them in many
years but they should still be around. Ron Miller Doug Smith wrote: Happy
NewYear everyone! I been running lots of experiments and taking data over
theholidays. The first result of all this activity is my Technical Tidbit
forJanuary, 2008. The link to the article is the picture of a spectrum
analyzer and two currentprobes at the bottom of the page at
http://emcesd.com[1[3]] . This month's Technical Tidbit discusses a method
ofusing a spectrum analyzerwith a tracking generator and a pair of current
probes to determine the resonant frequencies of wires and cables. This
methodcan be used to findEMC and other noise problems in equipment.
Abstract:A technique for using current probes to measure cable resonances
isdescribed. A swept frequency voltage is induced on a cable by one current
probe and the resulting current measured using a second one. This technique
can be especially useful in troubleshooting EMC emissions problems as well
asother noise related problems in equipment designs. This quick and easy
method can be applied to a new design for which circuit boards do not even
exist yet to avoid EMC and noise problems. The method has many potential
usesinside and outside of system enclosures. Doug --
------------------------------------------------------- ___ _ Doug Smith \/
)P.O. Box 1457 ========= Los Gatos, CA 95031-1457 _ / \ / \ _ TEL/FAX:
408-356-4186/358-3799 / /\ \ ] / /\ \ Mobile: 408-858-4528 | q-----( ) | o |
Email: doug@xxxxxxxxxx[2[4]] \ _ / ] \ _ / Website:
http://www.dsmith.org[3[5]]
------------------------------------------------------- --- Links --- 1
http://emcesd.com[6] 2 mailto:doug@xxxxxxxxxx[7] 3 http://www.dsmith.org[8]
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-- ------------------------------------------------------- ___ _ Doug Smith
\/ ) P.O. Box 1457 ========= Los Gatos, CA 95031-1457 _ / \ / \ _ TEL/FAX:
408-356-4186/358-3799 / /\ \ ] / /\ \ Mobile: 408-858-4528 | q-----( ) | o |
Email: doug@xxxxxxxxxx[16] \ _ / ] \ _ / Website: http://www.dsmith.org[17]
------------------------------------------------------- 

--- Links ---
   1 http://emcesd.com/tt2002/tt070102.htm
   2 mailto:ron@xxxxxxxxxxx
   3 http://emcesd.com[1
   4 mailto:doug@xxxxxxxxxx[2
   5 http://www.dsmith.org[3
   6 http://emcesd.com
   7 mailto:doug@xxxxxxxxxx
   8 http://www.dsmith.org
   9 mailto:si-list-request@xxxxxxxxxxxxx
  10 http://www.freelists.org/webpage/si-list
  11 mailto:si-list-request@xxxxxxxxxxxxx
  12 http://www.si-list.net
  13 http://www.freelists.org/archives/si-list
  14 http://groups.yahoo.com/group/si-list/messages
  15 http://www.qsl.net/wb6tpu
  16 mailto:doug@xxxxxxxxxx
  17 http://www.dsmith.org
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