Products > Test Equipment
What's the cheapest 0.02% accuracy handheld meter
CosteC:
--- Quote from: RFDx on July 12, 2023, 10:20:20 pm ---
--- Quote from: CosteC on July 12, 2023, 08:25:36 pm ---APPA 506
SANWA PC7000
Both around 225 euro, both more modern than BM859S.
--- End quote ---
Sanwa PC7000:
JP: 248€ (eBay)
US: 389$ (Sanwa US)
CN: 435€ (Ali)
DE: 745€ (Conrad) :o
Looks like purely arbitrary pricing.
Brymen 789 (0.03%, 60000 counts)
Brymen 869 (0.02%, 500000 counts)
Pricerange 190...220€ (incl. VAT). The 789 has a more modern appearance.
--- End quote ---
Late capitalism :) Price has nothing to do with cost of manufacturing or development.
APPA is also available rebranded in many places. BENNING IT 101, RS PRO IDM505 is probably APPA 505. Rebrands are ususally far more expensive however :)
https://ndn.com.pl/en/digital-multimeters/1972-digital-multimeter-pc7000-sanwa-50000-acdc-acc-003.html
https://ndn.com.pl/en/glowna/4164-digital-multimeter-appa-506b-acdc-003-truerms-bluetooth.html?search_query=506&results=11
https://ndn.com.pl/en/digital-multimeters/3930-multimetr-cyfrowy-appa-506-acdc-dokl-003-truerms.html?search_query=506&results=11
J-R:
No matter how you look at it, published accuracy specifications are far more imaginary than a specific instrument's calibration data.
I see a TE industry where a lot of the accepted product specifications seem to originate from the marketing department. And that is probably fine, because at the end of the day you need to make a product that will sell. But on the flip side we have plenty of products that can be hacked to higher performing models and of course as I mentioned, products that exceed their published specs by a significant margin.
I specifically did not mention calibration certificates, only calibration data. The data is literal proof in print that a "meter actually reads to 10X its spec". Also, it has the temperature at which the calibration data was taken, so you can match that environment.
In all areas of life we have hobbyists who push things to the limits, both dangerous and not. Industry, especially for paying customers, takes a much more conservative approach and has to account for a TON of variability, with regard to how standards are enforced, human nature, manufacturing variability, the list goes on...
So with that in mind, there is nothing wrong with a hobbyist discovering that their test equipment performs far better than expected and then capitalizing on that fact. On the flip side, it is definitely wrong to blindly trust a published spec and/or calibration certificates and that is why many industries have proving requirements as well.
CosteC:
I am rather on conservative end when it comes to datasheet performance. While my old APPA 72 has "only 0.5%" is it far more stable than cheap chinese no-brand multimeter which drifts with battery depleting. Long term stability for hobbyst is not super important if meter can be validated often. In industry nobody will do it - too much time, just buy better one if needed.
Most magic question for me is what hobbyst application calls for 0.03% accuracy and how to validate this accuracy in hobby environment? Professionally it would require well better instrument, starting from 0.01% but 6 1/2 digit DMM with starting from 0.0050% would be best.
What measurements require 0.03% DCV really? I used to measure small temperature differences for industrial processes, this was one case.
Other case seems to be measurements of small voltages, but there amplifiers come handy, however topic is tricky due to noise.
I appriciate AN870 declared accuracy, yet I do not trust it too much in long term...
Fungus:
--- Quote from: RFDx on July 12, 2023, 10:20:20 pm ---The 789 has a more modern appearance.
--- End quote ---
It's also a lot bigger and has a lot more distractions than the "industrial" BM857s/BM859s.
If you spend all day long looking at voltage/frequency simultaneously then go for dual display, no wukkas.
If you only do that rarely then why have a complicated display? Pressing a button to see Hz isn't too terrible and you can always add a second (or third) meter to see more values in a long session. :-)
Same goes for the selector switch. Do you really want multiple functions on every range when you hardly ever use most of them? The BM857s has separate switch positions for just about everything, only ohms/continuity is shared. This meter seems like the sweet spot to me.
My $0.02...
Fungus:
--- Quote from: CosteC on July 13, 2023, 06:53:13 am ---I appriciate AN870 declared accuracy, yet I do not trust it too much in long term...
--- End quote ---
Why not? There's not much inside one to go wrong.
It might have a worse tempco than a more expensive meter, or whatever, but I see no reason why it would go out of spec just because of the passage of time.
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