Very nice. I wouldn't even know where to look for them ...
One in France if the seller will take an offer eBay auction: #352652284969
Thanks. A bit expensive with shipping (which also seems dangerous to them, according to Kosmic), and no payment option that fits.
I will specifically search for them from now on, every once in a while.
Some of them are fine with being upturned it is the older more open ones are not. There is an internal seal inside some of them to prevent transfer from side to side. In 'more recent' (60-70's) the cells were fitted to portable test gear as a voltage reference so this was a must. The smaller Cambridge one I am sure is one of these types and so are my two existing Muirheads. The older open/crusty one is likely not but see what arrives.
Unsaturated cells are more robust than the saturated cells shown, and were used in portable equipment. Unsaturated cells also had a much shorter lifetime, which will have been exceeded long ago.QuoteThe are only coming from 300km away by post so no air will be involved.
Wanna bet? Have you seen the bizarre track that parcels take?
Most couriers explicitly exclude liquid mercury, amongst other things. If they are saturated, they will contain liquid mercury.
Seriously what a load of garbage when it comes to the life of Weston Cells either Saturated or Un-saturated. Some are still kicking well into their 4th and 5th decades plus some more in a lot of cases. My current two are getting on to 60 years old. Clearly some will have died along the way but a definitive " which will have been exceeded long ago" is and a quick check in the Metrology section here let alone online will show that.
Strawman argument; alternatively please indicate where I wrote that. As most people in this forum will be well aware, "exceeding the lifetime" != "dead".Quotehttps://www.eevblog.com/forum/metrology/1000-my-(hi)story-of-the-weston-cell-of-the-volt-and-of-being-a-volt-nuts/
Perhaps the US NBS is a more definitive source than a bulletin board? Have a look at "The construction and characteristics of standard cells" http://digicoll.manoa.hawaii.edu/techreports/PDF/NBS84.pdf especially section 8.QuoteClearly from 1/2 way around the planet you know more about our local postal service than I do and the Carrier Pigeons they use.
Well, you are only one person on this board, in one country, and you haven't specified the carrier. However, looking at https://auspost.com.au/content/dam/auspost_corp/media/documents/dangerous-and-prohibited-goods-guide.pdf has many references to mercury being banned, including in instruments.
Instead of trying to turn this to me to provide PROOF of YOUR POINT you call my statement a Strawman. Get of your perch and stop trying to provoke the response you deserve and if are attempting to troll me across the site then keep it up. Eventually you will get what you appear to be wanting
I already have a copy of that link from 1965 which I downloaded from the NIST site when I got my first ones. "Some of the Cells used by the NBS .... for nearly 60 years" There is no definitive statement as to lifetime but a 'general, probability and likely' 'usability' for cells of that time. Still NO definitive statement of lifetime. And yet you made the claim of 'exceeded lifetime' clearly you have superior knowledge
Is that the mains input socket on the front panel ?
IEC !
Is that the mains input socket on the front panel ?
What's better than owning an HP45? Owning two HP45s, of course...
I forgot about the bid I placed on what appeared to be a wrecked HP45 on ebay, when I was thinking I might need bits to fix the first HP45. When I got number one working I promptly forgot about potential number two. Then, beep! you've got mail! and twenty bucks later I own another HP45 and charger.
Yeah, algebraic calculators are perverted sicko porn.
Yep.
Was thinking the other day and came to the conclusion that yoda speaks in RPN.Another local hamfest today. I wonder what will follow me home?
Good luck! May the silent keys roll in their grave at the prices you pay
Not sure what I should do about the power socket, try and bodge a USA power cable or 'heresy' change it to a IEC? What do you guys think?
Rob
Yup, earth - what is an earth!
The whole instrument chassis sits inside the outer case - loaded from the front. From the feel - about 15kg of it.
Rob
your solution for wiring the old oval hp power sockets surely qualifies you for the "crown of bodge".I think the seller I bought my HP 101A crystal oscillator from can also claim that crown, he just hacked up a common IEC lead till it fitted.
I've had a few items with round crimp terminals bodged on too.
David
P.S. I have no idea where that lead is now and yes I still have it.
These are actually NEC/NEMA modular power sockets; one of the first standardized power cord/sockets with ground dating back to the late 50s.
They were pretty universal for about 20 years on all manner of commercial/industrial/scholastic AV & electronics products. My AV Dept manager showed me how to do this bodge as a temporary fix (They were NOT supposed to leave the shop this way) on the bench with an IEC cord back in the 80s; you just use the tail-end of a 3mm or 1/8" drill bit to open up the 3 contact sockets a little, then use a carpet knife carve 1/8" deep x 1/2" down the skirt on all edges of the IEC connector. Once you've done a few, you get to where you can't even tell the plug's been hacked unless it's unplugged.
The big problem with these sockets has nothing to do with the cord; they're supposed to be the same standardized pinout as the IEC cord. Problem is that a lot of manufacturers didn't fully adhere to the standard; they'd make the equipment with HOT & NEUTRAL swapped in the socket, and make their cord with the plug bass-ackwards to match.
As a result, we had a standing order to check any of these devices that came through the shop for this condition and reverse it in the device, then check the cable for correct pinout and if wrong, cut the socket end off the cable and confirm correct HOT BLADE-BLACK wiring. Or just cut both ends off and roundfile the cord with extreme prejudice.
mnem
*roundfiling my life*
Well that was 1.5 hours of my life I won't get back.
Mt Beacon "Hamfest".....2 dealers selling new radio gear, the ARRL and their set up, and bunch of tables and chairs set up with the hobos drinking coffee and eating donuts. No private sellers. No surplus equipment. No NOTHING!
To think I got up out of a nice comfy bed to hob-knob with hobos. NOT!
Care to joust? Just remember, those probes are meant to be used with DMM's with 10MEG input impedance. If your DMM defaults to a higher input impedance on the lower ranges you'll get inaccurate readings.
Well that was poo indeed. I'd have been rather annoying with it. TBH I've got a "hamfest shitlist" building up which has a couple on it so far for similar reasons.
Nice!! Always down for more RPN porn.One mans Porn is another's Perverted Sicko Porn
Red Green is some of the funniest shit ever.
Feel like in the medieval period.
... as I just scored this little red sharp pointy thingy, a Fluke 80K-40 HV probe.
your solution for wiring the old oval hp power sockets surely qualifies you for the "crown of bodge".
I'll wear it with all the dignity I can muster.
Could've been worse!
Well that was 1.5 hours of my life I won't get back.
Mt Beacon "Hamfest".....2 dealers selling new radio gear, the ARRL and their set up, and bunch of tables and chairs set up with the hobos drinking coffee and eating donuts. No private sellers. No surplus equipment. No NOTHING!
To think I got up out of a nice comfy bed to hob-knob with hobos. NOT!
was it raining?
learned a while ago that hams and water don't mix.
My latest technical writing fix:
https://www.eevblog.com/forum/testgear/hpagilent-1675x-logic-analyzer-card-memory-up-hack/msg2388675/#msg2388675
New Tekwiki made:
http://w140.com/tekwiki/wiki/EDX-1_Electromyograph_Storage
Updates:
http://w140.com/tekwiki/wiki/Pacific_Measurements_1038
(SNIP)
Scope creep-a-thon happening.
Another local hamfest today. I wonder what will follow me home?Good luck! May the silent keys roll in their grave at the prices you payI wonder if this one will resemble a hobo convention like last week.
Nothing like a cavity to make a pure sine wave - even if those waves are coming from 1955.
Put the glass back in place on the modulation meter, a bit of Meguires Plastix on the knobs, polished the bncs and a test run.
Photos below.
Not sure what I should do about the power socket, try and bodge a USA power cable or 'heresy' change it to a IEC? What do you guys think?
Rob
your solution for wiring the old oval hp power sockets surely qualifies you for the "crown of bodge".I think the seller I bought my HP 101A crystal oscillator from can also claim that crown, he just hacked up a common IEC lead till it fitted.
I've had a few items with round crimp terminals bodged on too.
David
P.S. I have no idea where that lead is now and yes I still have it.
These are actually NEC/NEMA modular power sockets; one of the first standardized power cord/sockets with ground dating back to the late 50s.
They were pretty universal for about 20 years on all manner of commercial/industrial/scholastic AV & electronics products. My AV Dept manager showed me how to do this bodge as a temporary fix (They were NOT supposed to leave the shop this way) on the bench with an IEC cord back in the 80s; you just use the tail-end of a 3mm or 1/8" drill bit to open up the 3 contact sockets a little, then use a carpet knife carve 1/8" deep x 1/2" down the skirt on all edges of the IEC connector. Once you've done a few, you get to where you can't even tell the plug's been hacked unless it's unplugged.
The big problem with these sockets has nothing to do with the cord; they're supposed to be the same standardized pinout as the IEC cord. Problem is that a lot of manufacturers didn't fully adhere to the standard; they'd make the equipment with HOT & NEUTRAL swapped in the socket, and make their cord with the plug bass-ackwards to match.
As a result, we had a standing order to check any of these devices that came through the shop for this condition and reverse it in the device, then check the cable for correct pinout and if wrong, cut the socket end off the cable and confirm correct HOT BLADE-BLACK wiring. Or just cut both ends off and roundfile the cord with extreme prejudice.
mnem
*roundfiling my life*
Volex did still make both the normal and reversed polarity cords some years ago. And to confuse matters they is a slightly smaller version too (I have a calculator with one). Do you have any more details on the actual standard for the connector type, the Volex data-sheet from 2007 just refers to the connector as being type PH163 and an Alpha data-sheet doesn't even mention the type.
Volex 17952 8 B1 (non-standard polarization). Volex 17280 8 B1 (standard polarization).
David
Well that was 1.5 hours of my life I won't get back.
Mt Beacon "Hamfest".....2 dealers selling new radio gear, the ARRL and their set up, and bunch of tables and chairs set up with the hobos drinking coffee and eating donuts. No private sellers. No surplus equipment. No NOTHING!
To think I got up out of a nice comfy bed to hob-knob with hobos. NOT!was it raining? learned a while ago that hams and water don't mix.Yes, it was raining but the hamfest was all indoors.
Well that was 1.5 hours of my life I won't get back.
Mt Beacon "Hamfest".....2 dealers selling new radio gear, the ARRL and their set up, and bunch of tables and chairs set up with the hobos drinking coffee and eating donuts. No private sellers. No surplus equipment. No NOTHING!
To think I got up out of a nice comfy bed to hob-knob with hobos. NOT!was it raining? learned a while ago that hams and water don't mix.Yes, it was raining but the hamfest was all indoors.
I think this phenomenon is as much ideological as it is practical in origin.
mnem
Yes, I said that with a straight face. You may stand in awe.
Well that was 1.5 hours of my life I won't get back.
Mt Beacon "Hamfest".....2 dealers selling new radio gear, the ARRL and their set up, and bunch of tables and chairs set up with the hobos drinking coffee and eating donuts. No private sellers. No surplus equipment. No NOTHING!
To think I got up out of a nice comfy bed to hob-knob with hobos. NOT!was it raining? learned a while ago that hams and water don't mix.Yes, it was raining but the hamfest was all indoors.
I think this phenomenon is as much ideological as it is practical in origin.
mnem
Yes, I said that with a straight face. You may stand in awe.
I'm sitting so I'll just give you an "awe shit".
edit: did i mention his HT, which he wore on his belt in the car, had a rubber duck antenna? he was surprised that net control couldn't hear him, so i worked the race alone. i will let you guess how many letters he had in his call.