Products > Test Equipment

Easy way to test the calibration of a DMM (Fluke 45)?

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Majorassburn:

--- Quote from: bdunham7 on March 30, 2024, 06:20:37 pm ---
--- Quote from: Majorassburn on March 30, 2024, 06:00:12 pm ---Shamelessly self-promoting my products..... :-DMM

--- End quote ---

As I stated earlier, a single-point source is of rather limited usefulness here.  Besides that, is your reference here sufficiently accurate to test or calibrate a Fluke 45?   Does the trim pot adjust the 10V or 6V output?

--- End quote ---
You just love to pick apart a reply and mis-state the context in which it was offered!
READ WHAT FriedChicken ASKED FOR: a low cost reference like the cheap Chinese devices on AliExpress, right?

So, you want to turn my reply into an argument and compare my $30 device with your favorite DMM Check for $250? Is the DMM Check sufficiently accurate to calibrate a Fluke 45? No F**king way and you know it! So why imply that my ad suggests that mine is? AGAIN and AGAIN in your multiple posts about my devices.

And, with all your expertise, if you read my description of my 10V references, it is CLEARLY EXPLAINED THAT THE TRIM POT TRIMS THE OUTPUT OF THE REFERENCE!

Does my ad anywhere say or imply or suggest that the pot adjusts the 6V tap?  Look closely and you'll see the 0.1% resistor divider that is FIXED at 6V as a "CONVENIENCE" and not a separate reference!

I'm sick of your arrogant sideswipes about most of my posts as I try to be a good participant in this forum. To hell with guys that want to flex their arrogance and inundate us inferior individuals with their self-proclaimed expertise. That's the kind of attitudinal presence that chase away forum participants and narrows the focus of an otherwise limitless exchange of ideas and experience.

So, I may as well get banned forever for saying this but I offer it with a cool head and considerate forethought...

bdunham7.....FUCK OFF!  :-- :-- :-- >:(




Fried Chicken:
Can both of y'all chill.

Major, your little voltage reference is exactly what I was looking for.  I didn't want to get one of the chinese aliexrpress ones because I don't trust something mass produced out of China.  The only reason I was holding off is because I wouldn't just want the voltage reference, but every reference you have available in one fell order... and I just spent money frivolously on other stuff, so I'm waiting here slightly.

bdunham, your offer to calibrate my multimeter is very generous and something I will take up on, assuming shipping is within the United States and available reasonably, which it should be through whatever freight forwarder service I use.  I can include the return label in the box....  I am curious about what equipment you have in your lab that you might test it with, so I can gloat about know to what standard it's been calibrated to.

bdunham7:

--- Quote from: Majorassburn on March 30, 2024, 09:40:12 pm ---READ WHAT FriedChicken ASKED FOR: a low cost reference like the cheap Chinese devices on AliExpress, right?

--- End quote ---

No, he wants to know which of his meters are correct and presumably in spec and which are not.  Neither your device or the cheap AliExpress AD584-based references are likely to be very helpful when it comes to the Fluke 45.  I'm not the one that advocated the DMM Check and it has the same issue regarding only having a single point for DCV.  Its stated uncertainties are marginal for the Fluke 45, but at least would be helpful in determining whether it was in the ballpark.

--- Quote ---bdunham7.....FUCK OFF!  :-- :-- :-- >:(

--- End quote ---

Yikes!  This is a simple discussion involving math and facts, no need to be offended if I don't agree with you.

J-R:
It might be a bummer to see that your two DMMs disagree that much, but let's analyze a bit.  The Hioki DT4251 is a 6,000 count DMM and you are near the top of the range at 5V.  The Fluke 45 is 99,999 counts but only in slow mode.  In medium mode you are limited to 30,000 counts which means you are in the 30V range.  Try setting it to slow mode in the 10V range.  You could also check the 100V slow range to gather more intel.

Also, was the Fluke 45 allowed to stay powered on for some hours before taking that measurement?

I disagree, the DMMCheckPlus is absolutely good enough to check those DMMs, and in another thread I mentioned leveraging the current source and resistors to generate additional values.  Sure, it's not going to allow you to check everything and the cost for this purpose is iffy as I also mentioned.  Also, the specs are worse case between calibrations, so right after receipt/calibration it is going to be better and that is a common metrology tactic.

Paying some money to get the Fluke 45 calibrated/adjusted seems like a reasonable path at the moment.  Although I wonder if it would be better to snag a calibrated 6.5 digit DMM instead if you're already worried about such things.

Majorassburn:
To Bdunham7:
OK. I'm never offended when you disagree with me. But, I don't like your seemingly pickiness and taking things out of context regarding my device claims.  I really strive to UNDER-state their capabilities and I would never try to inflate or scam anyone who trusts in me and buys one.

Look, I know that you are a valuable and expert contributor in this forum. I have admired many of your posts and contributions. But, you seem to have a bug up your ass about some of my devices that I offer on eBay. I wish I could resolve that with you because I know that I could learn a lot from you.

I will do my best to eliminate any sensitivity that i have developed about your "disagreeing" with me if you can try to frame your "concerns" about my posts in a more helpful and constructive manner.

I really do appreciate folks questioning my claims and raising questions as to performance, etc. so don't hold back.

TRUCE on my part. I'll probably get banned anyway for engaging in the nasty manner as I have in this post so, if or when I do, Best Regards to all and I'll see you on eBay (SQWARREL) in case I have anything you might be interested in.

Thank You.

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