Hi Ralph, Net You are right the probe should be traceably calibrated using HV pulses of known rise-time and application amplitude range. This is particularly true for fast pulses (start of wave shape). In HV Engineering it is well known to use capacitive/resistive dividers which are compensated. Linearity of amplitude must also be checked!
This is just like special amplifier design where one optimizes pulse response (e.g. overshoot) or frequency response. Perhaps you can get a probe on lease to compare? One source I know for these test probes is KeyTek near Boston (may be that is what you have, are they correctly calibrated ?) or Bath Electronics in Nevada http://www.barthelectronics.com/contact.html. Building very fast HV Pulsers and Probes... I often use Tektronix P-6015 HV-Probe (x 1000 for Oscilloscopes- 1MOhm input) with rise-times down to about 5ns and 20/40 KV peak. May be Mike Howard of https://www.liberty-labs.com/ can calibrate such probes, they do ESD. Most of these probes get calibrated with fast HV cable pulsers. Here the cable length sets the pulse width. I hope they helps, good luck best regards Diethard Hansen www.euro-emc-service.de From: [email protected] [mailto:[email protected]]On Behalf Of Ralph McDiarmid Sent: Donnerstag, 14. Juli 2005 23:29 To: [email protected] Subject: RE: calibration of high-voltage probe We are using an HV differential voltage probe to measure the surge waveform of our test generator. (ringwave and combination wave). Can anyone tell me where to obtain calibration of both rise-time and amplitude accuracy. The manufacturer calibrates the probe using a 150Vp-p 20kHz sine wave, but it occurs to us that the rise-time is critical in order to accurately follow the fast wavefront of a surge waveform. (we're measuring ringwave voltage surges up to 6kV) Thanks, Ralph McDiarmid, AScT Compliance Engineering Group Xantrex Technology Inc. This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html 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: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html 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: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
