Where I once worked we had a calibrated bucket of sand. It was used to apply pressure to LCD panels to see if they would break. We had to send it down to metrology yearly for calibration. We asked if we could just get a calibrated scale and weigh the bucket ourselves we were told no because we were not certified to weigh a bucket of sand.
The Other Brian Sent via the Samsung GALAXY S®4, an AT&T 4G LTE smartphone -------- Original message -------- From: CR Date:03/03/2014 5:42 PM (GMT-05:00) To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Schaffer surge generator 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 <emc-p...@ieee.org> 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 <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> ________________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> 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 <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
