Search found 28 matches

by Lukas Springer
Tue Oct 16, 2018 8:32 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Collection of information about russian SNM tubes
Replies: 13
Views: 7877

Collection of information about russian SNM tubes

Some information was brought together in a trading post, this is that information condensed down before the thread in trading gets deleted. As many of you are aware some russian SNM tubes are floating around and there seems to be much confusion on how to use them, This problem is not made easyer by ...
by Lukas Springer
Fri May 25, 2018 8:11 am
Forum: Vacuum Technology (& FAQs)
Topic: Reverse engineering the Instrutech IGM-400
Replies: 8
Views: 4437

Re: Reverse engineering the Instrutech IGM-400

Thanks for confirming my results! I do have some issues with starting them at low pressures, too, but there is no mention of anything like that in the manual. Maybe the sensors off ebay are somewhat broken? They should all have two filaments, but on all of my gauges I can measure only one, can you c...
by Lukas Springer
Thu May 24, 2018 9:25 am
Forum: Vacuum Technology (& FAQs)
Topic: Reverse engineering the Instrutech IGM-400
Replies: 8
Views: 4437

Re: Reverse engineering the Instrutech IGM-400

Yes, I did figure out how to use these gauges without an controller, that's what the first post here is about. The gauges have ha "proprietary" output pinout, with a loglin output voltage, everything I know is in the post. All of my gauges say "402" on the back, too, and I don't know what's up with ...
by Lukas Springer
Sun May 20, 2018 6:49 pm
Forum: Vacuum Technology (& FAQs)
Topic: Reverse engineering the Instrutech IGM-400
Replies: 8
Views: 4437

Re: Reverse engineering the Instrutech IGM-400

Thanks :) The IGM-402 and 400 don't seem to have exactly the same pinout, since pin 5 and 6 don't act as degas control, I've checked that. So far I could not capture any digital communication from the 400, so I just assumed the pirani gauges would give an analog output, too, but I haven't got a clue...
by Lukas Springer
Tue May 08, 2018 7:05 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Second pulse from He3 tube
Replies: 5
Views: 2574

Re: Second pulse from He3 tube

Of course it isn't a detector yet, it's just testing the tube so I could make use of ebays return policy, if needed. The scope is placed where the amp would be, the amp will have 1M input impedance as well, so it should amplify that smaller, second pulse. I know this pulse is not a neutron count, I'...
by Lukas Springer
Tue May 08, 2018 2:43 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Second pulse from He3 tube
Replies: 5
Views: 2574

Re: Second pulse from He3 tube

I don't think it's from bad / missing termination, since not every pulse is followed by a second one, regardless of pulse height. There is currently no amplifier installed and I'm measuring with the standard 1M input impedance of my scope, right after the AC coupling capacitor. All cables are 1m in ...
by Lukas Springer
Mon May 07, 2018 8:31 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Second pulse from He3 tube
Replies: 5
Views: 2574

Second pulse from He3 tube

Hi! I finally got myself a Helium-3 corona tube, the SNM-18-1 to be precise. I don't have a neutron source yet, so I've got to rely on background for testing; the screenshot below shows the signal from my tube for a couple of minutes, without a moderator. The tube counts about 10 cpm, and some (but ...
by Lukas Springer
Thu Mar 08, 2018 10:05 am
Forum: Vacuum Technology (& FAQs)
Topic: Reverse engineering the Instrutech IGM-400
Replies: 8
Views: 4437

Reverse engineering the Instrutech IGM-400

Hello! Aren't we all just looking for cheap high vacuum gauges? Many of you might have stumbled upon the Instrutech IGM-400 "hornet" hot cathode ionisation gauge on ebay, often going for less than 20 USD. So, what can you do with one of those gauges? A lot as it turns out! I ordered a couple for rev...