On 3/3/2014 4:04 PM, John Woodgate wrote:
I once spent some time at a Southern California lab that built their
own damped sinewave circuit only to have an assessor forbid its use
because it couldn't be calibrated.
'Couldn't'? If so, surely banning it was justified.
A Variac-adjustable, rectifier-capacitor-charging, HV PS without a
meter, driving a freestanding spark gap, vacuum variable capacitor and
copper tank coil, doesn't lend itself to calibration -- and doesn't need
it when the waveform depends on adjustments required before each test;
only the 'scope needs calibration. Making that assessor happy cost them
a lot of money, though of course the end result LOOKED a lot better.
Next; NIST traceable connectors?
Why stop there? Do you have a 10 m measuring tape that is traceable?
As related to me, a zealous metrology department head had once gone
through [a company's] desk drawers where I was on contract, taking away
"uncalibrated" steel rulers. The same individual wanted me to get
the paperclip antenna on my handheld receiver calibrated for the
sniffing I was doing for engineering investigations. All I needed to
do was narrow in on emissions.
One day I saw some young engineers there trying to do near field UHF
susceptibility testing with a small loop, but they hadn't noticed that
the amplifier they were used had meters reading in "VU." That equipment
was calbrated!
I emptied out the cleaning supplies in their chamber and got more
suitable equipment set up for that sort of testing.
Happy days.
We now return you to your discussion.
Cortland Richmond
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society emc-pstc discussion
list. To post a message to the list, send your e-mail to <[email protected]>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities site at
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used
formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <[email protected]>
Mike Cantwell <[email protected]>
For policy questions, send mail to:
Jim Bacher: <[email protected]>
David Heald: <[email protected]>
