Products > Test Equipment
High voltage oscilloscope probes, make or buy?
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TimFox:
Can you build the HV divider network directly into the circuit being tested, using appropriately rated components?
You can verify the operation at lower voltage, driving the divider from a good square wave or fast pulse, before hardwiring the top to the device under test.  You can also verify safe operation of the divider circuit at HV before connecting it to an expensive oscilloscope.
SeanB:
Lucky for me I still can get R141B, which will probably work in these probes. Still have 5l in a disposacan under my bench. Getting expensive though, but as a cleaner it works wonders, removes pretty much anything organic.
DanielS:

--- Quote from: Mechatrommer on April 14, 2015, 01:14:35 pm ---i will be very glad if you can give me ebay link where to get lossy 50ohm coax.
--- End quote ---
The cables off of defective probes are always an option. Another possibility is to design the divider network as an accessory for existing probes. Not ideal for precision measurements on fast edges or high frequencies but still good enough in many cases.
HighVoltage:

--- Quote from: korlatos on April 14, 2015, 04:08:24 pm ---
--- Quote from: HighVoltage on April 14, 2015, 08:45:03 am ---If you bought one of the older P6015 probes that require to be filled with fluorocarbon, you can fill them instead with a high voltage stable silicone gel to have them permanently filled. This is the same as in the P6015A. Just make sure the probe works perfectly, before you fill it with silicone gel.

--- End quote ---

Does anybody have any recommendations for the type (and source of it in the USA) of a silicone gel suitable for filling P6015?

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Contact Ellsworth for Dow Corning type 3-4680
http://www.ellsworth.com/products/by-market/consumer-products/encapsulants/silicone/dow-corning-3-4680-silicone-gel-transparent-blue-210-ml-kit/
This material has a dielectric strength of 16 kV/mm

I have several of these P6015A probes and one P6015 that I filled with a similar German made silicone gel material
The P6015 with the silicone gel was tested by me to 35 kV pulse signals and I detected no problems
Just make sure you fill it free of any air bubbles.
Hold the probe in an angle and let the silicone gel run down the  housing, essentially filling it slowly from the bottom.
 


korlatos:
Thank you, HighVoltage - that's great information. I saw some on-line references to people using mineral oil for filling P6015. Do you think that mineral oil would work as well as silicone gel? Were you able to successfully compensate your P6015 after filling it with silicone gel?
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