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Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi
This Fluke high voltage probe 80k-40 should be used with an ac or dc voltmeter with an input impedance of 10Mohm. The probe extends the voltage range up to 40 kV dc and 28 kV rms ac and has an input impedance of 1 GOhm. Inside this probe is a 1000:1 voltage divider.
Accuracy DC: 20 kV to 35 kV: ±1%, 0 kV to <20 kV and >35 kV to 40 kV: ±2%. Accuracy AC: 60 Hz, ±5%.
Please, 1. who has done high voltage measurements with this and other high voltage probes? 2. what is to say about the performance of such probes? 3. what is the upper frequency limit in the ac range, about 300 Hz?
There is no circuit for a frequency compensation inside the probe.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
You may want to look at two examples of my work.
My Website GreenBOT Dynamics explains some of this here : and here : and here:
As you can see neither page is complete, but they have links that double back to here, the 4HV.org forum where i have dozens of pages on measuring high bandwidth HV. Youll even find examples recently of my flyback 50-70khz measurements at 52 kV, with that big blue probe.
Search my name and projects here on the forum. As i said my website isnt complete so dont get too excited.
and a pic:
I gotta go to work, but ill add more if you just want a DMM solution.
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Patrick
Thanks for your hints, very interesting stuff. I would like to have not only a DMM solution but I am searching also a HV probe with a large bandwith of 75 MHz like the Tek P6015A or even more MHz and bigger voltages than 40kV. But are there limitations due to laws of physics?
Here are pictures of what is inside of this Fluke high voltage probe 80k-40, modern version:
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
First, there are no limitations to what your trying in terms of physics. only cost and how far your willing to go.
Second, ive never seen inside one of those types, can you show a close up of that black bit?
Next, yes the Tek ones are the fast solution, just buy one, its much more time intensive to make your own as i did. but mine and the Northstar companies are better than the tek ones. here:
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Yeah the old one looks like a normal ceramic body ruthenium oxide film resistor. that white flat version ive never seen.
heres another pic:
Now these are meant for 100kV and above, note the "grading rings" those keep the field shape in a desirable state to keep the whole complicated thing happy. I can tell you more about those if you like later. but the tek type are totally different in principle of operation. and the P6013 is totally different than the P6015. both teks are good though. If the P6015 meets your needs and you can afford it buy it. you can always build another one later.
Note: ive learned this, you cant build a perfect probe, but you can build a probe that will do what you need.
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Fluke high voltage probe 80k-40
