Electronics > Metrology

Guildline 4410 or Advantest R6581/T For Lab Cornerstone Standard?

<< < (7/7)

denimdragon:

--- Quote from: bdunham7 on February 27, 2024, 11:23:49 pm ---
So you have a variety pack and apparently will be trying a variety of designs.  When I said to start with 1000 hours, what I meant was that after that time your own data will tell you whether the devices have stabilized or not.  After that, your decision as to continue evaluating, reject or ship a particular unit would be based on your own readings. 

If you really are aiming for a 50ppm tolerance, you probably already have enough to start with in your current stable of 6.5-digit meters.  Of course a 10.000000000000000000V golden reference is nice, but you might start by signing up for the USA Cal Club and using the quite remarkable portable reference made by TiN.  Do a 10-day log of your three meters and the ambient temperature and you'll know what you have.  Once you start building some devices and figuring out how to characterize them for tempco, noise, drift and ????, you'll likely find that dialing in those last few ppm is a few steps down the line.

I suspect you'll end up trying to do better than 50ppm since there are competitive hobby-level products already in the marketplace that are well below that.  If you haven't already, check out the 10ppm 10V reference at www.voltagestandard.com. 

 

--- End quote ---

Yes, I am familiar with voltagestandard.com (isn't this Doug's site also? I have one of his 5 volt references).
Thanks for clarifying the 1000hrs. We are on the same page.

I'm putting in my order for LT1013 from mouser tomorrow, but I'm on the fence about the resistors. Let me
give a bit more information about what I have access to.

A few years ago, I bought out a local electronics stores' inventory when they shut down the business. They supplied
most of electronics business in the Texas area so there's tons of NOS components. It's mind blowing. I haven't went through .1% of the stuff there, if that (there's a post on the forum somewhere I believe). The references pictured
came from there. In addition to the tubes, vrefs, op amps, etc., I have a large amout of ww precision resistors, and BMF resistors. Some Vishay, Tellabs, Riedon, Caddock, Micro Ohm, Shall,.. you get the picture. My point is that, I literally have everything I need to make these references at minimal cost, as I've already absorb most of it with my initial purchase of the warehouse.

My goal is to use what I have available, thereby making the references affordable and still be able to recoup some of my investment and make a buck or two. I've been characterising the resistors with Agilent DMM utility (now Benchvue), with my 3456A, 34401A, and 3457A meters. I would like to use these resistors I have for one of TiNs references to see how they perform. However, I would like to buy the recommended resistors from Vishay, but the wait times and price annoys me a bit.

I think I will bite the bullet and buy the recommend parts, then build one with the parts I have charaterized. So that's my current conundrum. What route would you guys try?

I also realized, after sitting in a brown out for the last 5 hours, I'm going to need a nice generator to power my "Mini Metrology Lab" (thanks for that write-up Conrad!) 24/7 without making life long enemies of my neighbors. If that happens when I'm up and running, "the pooch is gonna be screwed"....

bdunham7:

--- Quote from: denimdragon on February 28, 2024, 02:35:47 am --- However, I would like to buy the recommended resistors from Vishay, but the wait times and price annoys me a bit.

--- End quote ---

Try:

https://webdirect.texascomponents.com/

I'm not sure what I'd try in your case.  I'm trying not to fall down that particular rabbit hole... :)  Perhaps just build some raw (6.9xxV) reference devices without the divider stage and see how your stability measuring works out. 

denimdragon:

--- Quote from: bdunham7 on February 28, 2024, 05:50:29 am ---
--- Quote from: denimdragon on February 28, 2024, 02:35:47 am --- However, I would like to buy the recommended resistors from Vishay, but the wait times and price annoys me a bit.

--- End quote ---

Try:

https://webdirect.texascomponents.com/



--- End quote ---

Wow. I can literally drive there in 15 minutes and it's a staight shot. You made the decision easy. Thanks! :-+

RandallMcRee:

One thing that occurs to me: it would be value-add if the standards you sold were characterized for noise and, in particular, popcorn noise.

If you are checking for stability this might be part of your QA.

alm:

--- Quote from: denimdragon on February 28, 2024, 02:35:47 am ---I would like to use these resistors I have for one of TiNs references to see how they perform.

--- End quote ---
TiN is unfortunately no longer active on this forum, but he has been very supportive of such initiatives in the past with design reviews and calibration of self-built standards, so once you have a prototype I'd suggest contacting him.

Navigation

[0] Message Index

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod