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Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
It's just a Caddock resistor, HAHAHAHAHHA!
I have some of them, probably not that value, but they are precision resistors.
Your frequency response is dependent of your meter as well. Remember there is a precision rectifier circuit in the meter to convert to RMS DC and it is bandwidth limited. You should be able to check it with a simple sine source and see the limitations of the meter, and a good meter should have that in it's spec. sheet.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Hazmatt_(The Underdog) wrote ...
It's just a Caddock resistor, HAHAHAHAHHA!
Ive got more HV resistors than i can count. All different pecision, values, american, soviet makers and so on.
I have found it better to have an arsenal of HV resistors then to try and buy them as you need them. So much changes that you can get stuck with high cost or design changes that are alot of work.
A 225kV, 3Gohm resistor string, from Del HV, (now Spelllman) C7817 unit.
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Patrick
Here are the results of preliminary measurements of the frequency dependence of the old high voltage probe FLUKE 80K-40 with the Caddock resistance at 10 Hz, 100 Hz and 1000 Hz. My equipment consists of a HP function generator, a Tek 7854 with the y-plugins 7A22 and 7A26. The input voltages (5V/div) for the high voltage probe for these three frequencies are shown in the next pictures:
The output signals of the high voltage probe are shown in the next three pictures (7A22, 5mV/div). To eliminiate all kinds of electrical noise as far as possible the external trigger of the oscilloscope was used to add up the small signals one hundered times with the right phase:
From this dataset the frequency dependence can be determined.
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Patrick
Also in my opinion the value of the high voltage probe signal for 1 kHz seems to be a little bit to high. I think the signal is measured correctly but the question is: Is this signal (around 5 mVpp) only the result of the voltage divider of the high voltage probe? The connection between the probe and the oscilloscope is not a coax cable with BNC, at the end are banana plugs!
I will proceed these measurements with more frequency data points to get a more reliable frequeny dependence of the output signal of this high voltage probe.
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Fluke high voltage probe 80k-40
