(SOLD) two (2) tektronix a6302 for sale or trade - Page 1
Forum section: electronics / general

author: OiD
author_rank: Regular Contributor
timestamp: September 12, 2019, 11:07:51 am
content: SOLDThanks for all the interest. Was not expecting so many PM'sCheers!I have two Tek A6302 50mhz current probes. Either I sell/trade/toss them.One in good condition. Last cal 2008.One missing thumb slider button and probe tip plastic.Unable to test. I wanted to make a DIY probe but I don't have the time.Price? Something relevant. Buyer pays shipping. No returns.Trade? High voltage stuff, giant ferrite cores, laser parts, RF stuff...Toss? To the recycling center!Cheers!

author: trevwhite
author_rank: Frequent Contributor
timestamp: September 12, 2019, 11:21:47 am
content: Do you have any images of the probes?Trev

author: IDEngineer
author_rank: Super Contributor
timestamp: September 14, 2019, 04:21:08 am
content: x2... Any photos? Do you have the amplifier(s) for them? If so, which models? I've been looking for one of these for a while now but need more info before I can make an offer. Thanks!

author: capt bullshot
author_rank: Super Contributor
timestamp: September 14, 2019, 07:16:53 am
content: In case they're still working, the probes are the more rare and more valuable part. One can get the amplifiers alone for less than 100 EUR, a complete working set still can get quite expensive.

author: IDEngineer
author_rank: Super Contributor
timestamp: September 14, 2019, 12:53:47 pm
content: Yep, I'm aware of that. Just trying to understand what is being offered here. I might buy both probes, the second for parts, if they're in working order. But without more data there's no way to know their value, if any.

author: OiD
author_rank: Regular Contributor
timestamp: September 16, 2019, 07:12:59 pm
content: Hi!Sorry! Been very busy. Here is a photo were you can see the damage. I only have the probes. I didn't pickup any of the amplifiers because I hauled a cart full of oscilloscopes and they were very big.One of them is quite damaged. If there is any guide to test them please let me know.Regards,

author: OiD
author_rank: Regular Contributor
timestamp: September 18, 2019, 07:28:54 pm
content: Hi Again!Just found the pinout for the probes and on both probes the internal switch, transformer and HAL device are functional.No degaussing was done as I don't know the process details for these probes.Attached are a few images of the measurement performed with an electric space heater on low power.The noise in the signal is due to a nearby (possibly pirate) radio station.A is the complete unit and B is the one missing the button and the tip of the housing.Seeing that they are much more simple than expected they won't be tossed but they are still up for offer!Cheers,

author: PartialDischarge
author_rank: Super Contributor
timestamp: September 18, 2019, 08:38:15 pm
content: Quote from: OiD on September 18, 2019, 07:28:54 pmActually they are much more complex that what the pinout shows. There is high frequency transformer and a low frequency hall effect one. To test the first one a fast current pulse is needed (the attenuation is high at 50Hz), and to test the second one at line frequency active feedback from the am503 is a must, so sorry but your measurements dont really show anything working, just coupling of magnetic fields into coils

author: jonpaul
author_rank: Super Contributor
timestamp: September 18, 2019, 09:12:33 pm
content: Hi there I have good stocks of large ferrite cores, bobbins and high voltage stuffBeen doing HV and Tesla stuff since 1950s.I Can arrange shipping from/ to USA.What is issue of defective probe?Please contact me via personal message, off list.Kind RegardsJon

author: IDEngineer
author_rank: Super Contributor
timestamp: September 18, 2019, 10:18:40 pm
content: Quote from: jonpaul on September 18, 2019, 09:12:33 pmThe ferrite core in these probes was custom made by Tektronix specifically for these probes, and they have a Hall Effect sensor mounted on them to handle DC and low frequencies. No off-the-shelf cores will just "swap in".

author: Ismsanmar
author_rank: Regular Contributor
timestamp: September 18, 2019, 10:52:57 pm
content: Quote from: IDEngineer on September 18, 2019, 10:18:40 pmHave you read the first post completely?

author: rodpp
author_rank: Frequent Contributor
timestamp: September 18, 2019, 11:15:24 pm
content: I'll send you a PM.

author: IDEngineer
author_rank: Super Contributor
timestamp: September 18, 2019, 11:24:37 pm
content: Quote from: Ismsanmar on September 18, 2019, 10:52:57 pmUmm... yeah, a while ago... just read it again... {embarrassed}

author: PlainName
author_rank: Super Contributor
timestamp: September 19, 2019, 02:47:48 pm
content: QuoteI am intrigued! Why didn'tyoucontacthim'off list' to start with?

author: OiD
author_rank: Regular Contributor
timestamp: September 22, 2019, 09:16:02 pm
content: Hi all again.Again, sorry for the delays, new job training and got rear ended by another car so I'm a bit low on energy as well as time (but we are all low on time)As you have mentioned 50Hz test is not really indicative here is a test of the units at about 120kHz from a Resonant LC driver.Again A is the complete unit and B the one missing the button and bit of plastic at the tip.Yellow is the transformer. A looks cleaner than B.Green is the HAL sensor. A looks cleaner than B.Purple is the measured Voltage.No red as my current probe only goes to 20kHz.I'm surprised from the HAL sensor, it looks like it's responds faster than the transformer....Lot's of PM's so I'll try and go through them now.Again thanks for the interest, I wasn't expecting this so I'm glad if they get used

author: edavid
author_rank: Super Contributor
timestamp: September 24, 2019, 03:04:32 pm
content: Quote from: OiD on September 22, 2019, 09:16:02 pmIt is a Hall sensor... named after Edwin Hall:https://en.wikipedia.org/wiki/Hall_effectYou can see that it is nonlinear, so it is operated at zero flux; current through the coil is used to keep it there.I don't think your tests are conclusive, since the whole amp/probe system is pretty finicky. Better than nothing, I guess.

author: OiD
author_rank: Regular Contributor
timestamp: September 24, 2019, 06:12:00 pm
content: Oops, that's a big typo! Yes, Hall, not Hal...Yeah, my tests are no way conclusive, but just to help provide all the info I can. I've just repaired my 40V 15A PSU so on to repair the next thing! Not gonna waste more time on the probes so no more testing (not that I'd know of any other test for them!)Cheers!