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Quote from: BU508A on February 18, 2020, 05:31:01 pmQuote from: bd139 on February 18, 2020, 05:16:54 pmAnyone in UK need a death-inator?https://www.ebay.co.uk/itm/372957387420(Hewlett Packard 6516A)I'm tempted but I can't think of a legitimate use for it other than murder.Ungh!This is not really looking good. I'd carefully inspect this thing BEFORE I'll get it anything near mains power.Rust on the outside for a high voltage device is imho never a good sign.I hope, that the buyer of this thing knows what he is doing.@bd139: glad, that you want to stay away from it. I'm really interested in reading more posts from you here. Agree. Dangerous as hell.Hahaha. Honestly I am shit scared of high voltages and rather like low voltage stuff so hopefully I'll not kill myself too quickly.
Quote from: bd139 on February 18, 2020, 05:16:54 pmAnyone in UK need a death-inator?https://www.ebay.co.uk/itm/372957387420(Hewlett Packard 6516A)I'm tempted but I can't think of a legitimate use for it other than murder.Ungh!This is not really looking good. I'd carefully inspect this thing BEFORE I'll get it anything near mains power.Rust on the outside for a high voltage device is imho never a good sign.I hope, that the buyer of this thing knows what he is doing.@bd139: glad, that you want to stay away from it. I'm really interested in reading more posts from you here.
Anyone in UK need a death-inator?https://www.ebay.co.uk/itm/372957387420(Hewlett Packard 6516A)I'm tempted but I can't think of a legitimate use for it other than murder.
When I started contracting, a long time ago when I was about 20, I'd never written a line of C in my life. I spent the weekend before my first day with a copy of K&R and wrote a program to play noughts and crosses.Nobody noticed the fact that I'd lied my way through the interview!
I've used most languages (including lots of assembler) over the years but C is still my absolute favourite. I like to call it "structured assembly language".
Quote from: Zucca on February 18, 2020, 07:51:34 amI still remember at high school one day when the teacher shut me down, and it did not feel right. Only 2 years later at the university I understood I was damm right and he was a stupid muppet that day.When I remember it my blood pressure goes up, even today.I do not want you to regreat it like I did.Remember the old aphorism:* Those that can, do.* Those that can't do, teach.* Those that can't teach, teach teachers,* Those that can't teach teachers become an education officer.Inside every English teacher is a frustrated novelist.Inside every physics teacher is someone who feels unfairly denied a Nobel prize.Inside every physical education teacher is a wee grudge-bearing bastard with no more right to walk on God's good Earth than a plague bacterium.
I still remember at high school one day when the teacher shut me down, and it did not feel right. Only 2 years later at the university I understood I was damm right and he was a stupid muppet that day.When I remember it my blood pressure goes up, even today.I do not want you to regreat it like I did.
Quote from: bd139 on February 18, 2020, 12:45:51 pmIndeed. Being accidentally effective is not being effective Edit: As for faking knowledge, in the "IT trade" it's normal to play this off against the old idiom that in the kingdom of the blind, the one eyed man is king. Thus I got a Perl job once having never written a line of Perl and learning enough of it to look professional in relation to the rest of their staff in the weekend that elapsed between getting the job and starting there. When I started contracting, a long time ago when I was about 20, I'd never written a line of C in my life. I spent the weekend before my first day with a copy of K&R and wrote a program to play noughts and crosses.Nobody noticed the fact that I'd lied my way through the interview!
Indeed. Being accidentally effective is not being effective Edit: As for faking knowledge, in the "IT trade" it's normal to play this off against the old idiom that in the kingdom of the blind, the one eyed man is king. Thus I got a Perl job once having never written a line of Perl and learning enough of it to look professional in relation to the rest of their staff in the weekend that elapsed between getting the job and starting there.
Why do you think I wear rubber gloves when probing around in the 535A? The +100V, -150V, and +225V are enough to give you pause. But add to that +325V and +500V floating around and it makes your hands tremble a bit. AND....if you look close you can see an arc jump to your probe when checking the +500V. +3KV? Fawk you.
Quote from: med6753 on February 18, 2020, 07:26:37 pmWhy do you think I wear rubber gloves when probing around in the 535A? The +100V, -150V, and +225V are enough to give you pause. But add to that +325V and +500V floating around and it makes your hands tremble a bit. AND....if you look close you can see an arc jump to your probe when checking the +500V. +3KV? Fawk you. Pretty much the same in any CRO's EHT area, most are somewhere around 2kV and a few nudge 3kV before they're trebled, quadrupled or quintupled.....yeah that stuff gives me the screaming hebe jeebies without a decent HV probe but just the EHT is not too bad providing the test points are readily accessible.Still you want probes and leads that are rated for these elevated voltages and better still with clips so you can connect when OFF and power ON for measurements.I don't at all miss fixing CRO's.
Yeah exactly. Tek 2235...To do this measurement I just soldered the test leads on the (disposable) BM22s to the test points and stepped well back It actually was quite happy to about 2.1KV and then made some nasty noises. Survived fine!!!! Nice DMM that.Note the 87V in the background looking worried
Quote from: tautech on February 18, 2020, 07:45:43 pmQuote from: med6753 on February 18, 2020, 07:26:37 pmWhy do you think I wear rubber gloves when probing around in the 535A? The +100V, -150V, and +225V are enough to give you pause. But add to that +325V and +500V floating around and it makes your hands tremble a bit. AND....if you look close you can see an arc jump to your probe when checking the +500V. +3KV? Fawk you. Pretty much the same in any CRO's EHT area, most are somewhere around 2kV and a few nudge 3kV before they're trebled, quadrupled or quintupled.....yeah that stuff gives me the screaming hebe jeebies without a decent HV probe but just the EHT is not too bad providing the test points are readily accessible.Still you want probes and leads that are rated for these elevated voltages and better still with clips so you can connect when OFF and power ON for measurements.I don't at all miss fixing CRO's. Of course anything beyond the HV oscillator transformer is verboten unless the HV probe is in hand. Even with it I don't like venturing in that area unless absolutely necessary.
To do this measurement I just soldered the test leads on the (disposable) BM22s to the test points and stepped well back It actually was quite happy to about 2.1KV and then made some nasty noises. Survived fine!!!! Nice DMM that.
And now back on topic again, I've just noticed that one of the small panel mounted sockets for component leads is actually broken and the missing piece of plastic is actually missing otherwise I could just glue it back on. Does anyone know of where these may be available from, the smallest so far that I have come across has been 2mm and I think these are 1mm. They look to be pretty corroded anyway so it would be nice to replace all 4 of them.The unit is so sensitive that if I use leads with 4mm bananas and crock clips on the other end (1m long) on lower values the meter can actually read the capacitance between the leads as well. I have a very short set of leads that could be used if necessary, but its so much better to just push the capacitors leads directly into the sockets. I like the way that they have arranged the sockets to provide maybe the 3 most common pitches between the leads to maximise the accuracy of the readings, awesome.
Ahh a telonic shopper .Yeah it's well put together. It has proper protection features inside it being Brymen. I take mine to hamfests to poke things with. Also to note they go for £22 on ebay at average if you have some surplus (I think I ended up with about 5) so profitable!
At least you can still get the batteries for the Brymen
Quote from: bd139 on February 18, 2020, 09:22:23 pmAt least you can still get the batteries for the Brymen True, that being said, the batteries for the Avo's are still available but pricey, BUT, not required when measuring voltage though.
Quote from: Specmaster on February 16, 2020, 03:57:25 pmAnd now back on topic again, I've just noticed that one of the small panel mounted sockets for component leads is actually broken and the missing piece of plastic is actually missing otherwise I could just glue it back on. Does anyone know of where these may be available from, the smallest so far that I have come across has been 2mm and I think these are 1mm. They look to be pretty corroded anyway so it would be nice to replace all 4 of them.The unit is so sensitive that if I use leads with 4mm bananas and crock clips on the other end (1m long) on lower values the meter can actually read the capacitance between the leads as well. I have a very short set of leads that could be used if necessary, but its so much better to just push the capacitors leads directly into the sockets. I like the way that they have arranged the sockets to provide maybe the 3 most common pitches between the leads to maximise the accuracy of the readings, awesome.They look very familiar, do you still need some?David
Quote from: Specmaster on February 18, 2020, 09:31:17 pmQuote from: bd139 on February 18, 2020, 09:22:23 pmAt least you can still get the batteries for the Brymen True, that being said, the batteries for the Avo's are still available but pricey, BUT, not required when measuring voltage though. A stack of LR44 button cells and a bit of shrink sleeve is the cheapest replacement for those 15V cells.
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