Ralph,
When I've calibrated HV probes I have not always had a HV pulse source
that would allow calibration at the maximum rated probe voltage. In that
case I check the DC divider ratio at a low, medium, and high voltage to
confirm that there is no voltage coefficient. Then calibrate the probe
using a pulse that gives a useful measurement.
Dave Cuthbert
Micron Technology
From: [email protected] [mailto:[email protected]] On Behalf
Of Diethard Hansen
Sent: Thursday, July 14, 2005 6:32 PM
To: 'Ralph McDiarmid'; [email protected]
Subject: RE: calibration of high-voltage probe
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.
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