Products > Test Equipment
Easy way to test the calibration of a DMM (Fluke 45)?
Majorassburn:
--- Quote from: Fried Chicken on March 30, 2024, 04:52:36 pm ---So this is where the challenge comes in, what reliable voltage source might I have laying around... Else as shapirus suggested, one of those aliexpress/ebay voltage sources... Unless there's some creative way to find a reliable voltage source. Maybe from a PC computer that might have a built in multimeter for its 5v USB rail?
--- End quote ---
Shamelessly self-promoting my products..... :-DMM
https://www.ebay.com/itm/285781907875
Plus, I have precision resistors, etc....
Fried Chicken:
--- Quote from: Majorassburn on March 30, 2024, 06:00:12 pm ---
--- Quote from: Fried Chicken on March 30, 2024, 04:52:36 pm ---So this is where the challenge comes in, what reliable voltage source might I have laying around... Else as shapirus suggested, one of those aliexpress/ebay voltage sources... Unless there's some creative way to find a reliable voltage source. Maybe from a PC computer that might have a built in multimeter for its 5v USB rail?
--- End quote ---
Shamelessly self-promoting my products..... :-DMM
https://www.ebay.com/itm/285781907875
Plus, I have precision resistors, etc....
--- End quote ---
I shall keep this in mind, but right now I've spent so much money on stuff I'm waiting before selling anything.
bdunham7:
--- 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?
bdunham7:
--- Quote from: Fried Chicken on March 30, 2024, 06:10:21 pm --- I've spent so much money on stuff I'm waiting before selling anything.
--- End quote ---
Worrying about anything past the second place after the decimal point can get expensive in a hurry, so be careful!
If you like, I can unofficially calibrate your Fluke 45 for the cost of postage both ways. I'll post the process and results to the forum here. PM me if interested. I don't have and can't find calibration info for the Hioki, so I'd be unable to adjust it, but it can be characterized so that you know how far it is off.
Fried Chicken:
--- Quote from: bdunham7 on March 30, 2024, 06:40:30 pm ---If you like, I can unofficially calibrate your Fluke 45 for the cost of postage both ways. I'll post the process and results to the forum here. PM me if interested. I don't have and can't find calibration info for the Hioki, so I'd be unable to adjust it, but it can be characterized so that you know how far it is off.
--- End quote ---
That's very generous, and would be fantastic! assuming you have the right equipment. I toyed with replacing any recommended wear components (electrolytic capacitors, carbon composition resistors, etc.) prior to having some sort of calibration done at some point.
Unfortunately Hioki has terrible support for their instruments, providing neither schematics, repair manuals, or even calibration instructions. I was quite fond of Hioki, bordering on fanboyism, until I found this out. It's a damn shame.
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