Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
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ch_scr:

--- Quote from: TERRA Operative on July 09, 2022, 06:05:10 am ---
--- Quote from: ch_scr on July 09, 2022, 05:16:50 am ---Supposing there is not enough clearance behind the panel, the safest option would be to print a combined holder for panel mount female jacks. The 3d printed part could be thick-walled and isolation would be provided by the plastic of the jacks. I guess they did it like this, because shrouded male connectors (as are standard on decent modern multimeters) were not readily available? You'll have to upgrade the leads to said type as well, but that should make a decent looking, safe and robust solution IMHO.

--- End quote ---

Yeah, maybe some basic plastic spacer rings to extend the plugs out of the front panel would work, pending investigation of clearances.



--- Quote from: tautech on July 09, 2022, 05:20:59 am ---Whaddabout M-F banana leads and leave them in place ?
https://www.amazon.com/Extension-Connector-Silicone-Multimeter-Adapter/dp/B07NWZ71GH

--- End quote ---

The panel connectors in my unit are broken (Pressure from the nut has caused the plastic of the connector to crack), so they all need to be replaced.

--- End quote ---

Upon closer inspection I fear the safety panel jacks might be too thick to fit there together well, or might obstruct the markings at least.
https://de.aliexpress.com/item/32684201221.html
Example link for size, the body is M12 x 21mm + the length of lug (9mm). Seems a standard size?

Edit: In that case a strain relief and "female safety jack on a wire" per hole (basically cut the cables tautech recommended) might be the cleaner option. The "other half" of the cut cable could be soldered and heat shrunk to the harness. Only the colours would be off, but if it's for personal use a bit of coloured heat shrink would probably be "good enough".
tggzzz:

--- Quote from: tautech on July 09, 2022, 12:15:49 am ---
--- Quote from: mnementh on July 08, 2022, 11:50:48 pm ---
--- Quote from: tautech on July 08, 2022, 08:50:57 pm ---TBH if you can be bothered to cobble something together use the oz2cpu/Defpom method.
Why, because of mwyatt's contribution simulating my measurements to come up with the values of the passives in the networks of the OEM probe.
These things OEM whom as yet I've not found who makes them are damn expensive but don't forget a 20 lot of decent  quality grabbers alone will set you back a C note !

Or if you not in a hurry, keep an eye out for one that looks identical but made for LeCroy, Tek or Rigol and a little sleuthing on each of their websites will get you the Pt. # to look for.......then post them in the DIY thread for the benefit of others.  ;)

I'm 100% they all have the same OEM and the twin thin silicone 8 way ribbon coax (that's a mouthful ! ) is a thing of beauty and near impossible to emulate unless you got mates in the company where it's made to get offcuts !
That's why Defpom went the route he did so to get something nice for his efforts rather than some cobbled together twisted pair mess.

Last year Siglent were specialing SPL2016 + MSO/LA and AWG/FG licensing with a new SDS2000X Plus for just $ 219 that was one hell of a deal compared to shelling out retail for each.
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Actually, I was thinking to make a header so I could plug the HP pod and whip leads directly into the oz2cpu scope PCB. As I said, those will probably be more than long enough for anything I'd be doing, unless I change my mind and put the scope up higher on my bench, which is pretty unlikely ATM.

I was asking about MK's project since you linked to it at the beginning of the SDS2000X thread. :-// Not knowing what the difference is between the Siglent frontend and the HP braided cables, I'm leery of just plugging random lengths of either braided cable or micro-coax into the front of the scope without any compensation, or the wrong compensation. I saw the issues oz2cpu was having there in the beginning.

mnem
 :-/O

--- End quote ---
OK so if you already have the HP pod den go widdat !
Be aware you only need get something 1/2 clean into the LA input terminals as what's shown on the display in Digital mode bares little resemblance to the actual signal. IIRC there's discussion about this in the DIY thread.
IMO coax LA probe set compensation is likely to be pretty much an industry standard however the truth of the matter is suck it and see.
But the fact that we don't see cries that 'it don't work properly' for any of these DIY creations which points to them being fairly forgiving.

--- End quote ---

General principle: assure yourself that you have sufficient analogue signal integrity. Then flip to the digital domain with an LA ot printf() etc.

If you do that then there is a good chance that there is sufficient leeway on the analogue waveform for it to be corrrecly interpreted as a digital signal, even with a crappy termination. That, after all, is a main benefit of digital signals.

The exception could be with the clock signal, especially if the other signals are close to setup and hold time limits.
m k:

--- Quote from: ch_scr on July 09, 2022, 08:53:25 am ---
--- Quote from: bd139 on July 09, 2022, 08:45:39 am ---They’re only available during business hours during which I am too busy :(

--- End quote ---
Yeah OK, that's annoying. I have let go free stuff because it was only available for pickup at office hours.

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If you take some time off how long it is still less expensive.
bd139:

--- Quote from: m k on July 09, 2022, 09:19:53 am ---
--- Quote from: ch_scr on July 09, 2022, 08:53:25 am ---
--- Quote from: bd139 on July 09, 2022, 08:45:39 am ---They’re only available during business hours during which I am too busy :(

--- End quote ---
Yeah OK, that's annoying. I have let go free stuff because it was only available for pickup at office hours.

--- End quote ---

If you take some time off how long it is still less expensive.

--- End quote ---

As a contractor it’s unlikely to be cheaper unless it’s really expensive  :-DD
m k:

--- Quote from: Robert763 on July 07, 2022, 03:34:20 pm ---
--- Quote from: m k on July 07, 2022, 03:00:32 pm ---
--- Quote from: Zucca on July 07, 2022, 01:25:10 pm ---
--- Quote from: Zucca on July 02, 2022, 12:50:12 am ---I knew it  :palm:
I will try one more time, but they are forcing me to go off grid...

1) I do not want to buy at the double price I am selling back to them
2) I want to put how much panels I want on my roof in my property
3) Yes the base price for a bidirectional meter is 16$ instead or the regular 12$ each month, and recently a power company in the area bumped it up to 30$/month just because.

--- End quote ---

Finally I talked yesterday with Mark a nice eng from the power company:

As long I do not feed back energy from my home to the grid:

1) No need to change my contract or install a bidirectional meter. My base price will stay the same 12$/month.
Will cost less than an emergency generator with maintenance included.

2) There is no more the 100% energy offset concept. I am allowed to get as much power I want from my roof.

3) Only an anti-islanding, quick disconnect device is required.

Basically since I will stay passive, what happen behind the meter is not power company beer.

Sharing all the above with all 3 solar companies I am talking to, they are all going "Oh Oh, this is interesting and awesome... thanks for sharing..."

 :popcorn:

--- End quote ---

What was the beginning?
I've not followed it.

I've wondered many times why people are so keen to selling their excess.
How many life times it'll take to pay that hardware back.

Here I'd probably have to pay more /kWh if my usage goes under some electric heating level but that is probably all.
Then I read how somebody is selling watt hours.
I don't get it.

Though I do know that unauthorized panels are or used to be a big no-no in Spain.
My understanding is also that it includes all types of uses and that the reason is overall used grid power.

--- End quote ---

Well in some countries you were / are paid MORE for the power fed into the grid than you pay for power taken out of it. Sometimes a lot more. This is of course paid for by a "green" tax on all the other consumers.
I've often wondered if anyone out there was charging batteries during the night and feeding the grid in the day to make money....

--- End quote ---

That really has to be a lot more.
We obviously don't have a source but how is southern USA, whole year of surplus?
(Wh category is considered as ripple)

Here it is a bit different.
I think we also have a dynamic pricing model where supply and demand do their thing.
So it's possible that you are paying both ways.
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