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| DMMCheck Plus Multimeter Reference(and other References) - Experiences.. |
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| tomud:
--- Quote from: Fungus on July 09, 2023, 03:36:22 am --- --- Quote from: KungFuJosh on July 09, 2023, 01:09:13 am ---Got a link for that one? I can't find it. --- End quote --- The sticker says I bought it in 2017 so exact models have changed since then. Today's equivalent is probably this: https://www.aliexpress.com/item/32658819804.html The ad says "10. Each board at the factory to be detected with Aglient 6 digit multimeter, and marked with the output voltage, user-friendly." (nb. Random seller...I have no idea if they're good but they've sold 65 and got good reviews) --- End quote --- This is just a description, and the photos in the comments clearly show that there is no voltage measurement sheet attached. When I was buying mine, I had to do some research at auctions to find one with a handwritten card, because there were also printed cards where all the copies sold had the same voltage values (cheating). Currently, in the same way, you have to look in the photos attached in the comments if there is a sheet with voltage measurements. Here, for example, there is a comment that the PCB is described, but there is no message with what accuracy. On the other hand, in other auctions I have seen descriptions only up to the third decimal place. https://www.aliexpress.com/item/1005004617368378.html https://www.aliexpress.com/item/1005004186281432.html Here again you can see on the printed sheet - but it's hard to tell if these are real voltage measurements (too small photo in the comment). https://www.aliexpress.com/item/1005005609015568.html Here again the version I have in the acrylic housing, in one comment there is information about the attached voltage measurements. https://www.aliexpress.com/item/32813473384.html Here again versions with LM399: https://www.aliexpress.com/item/1005002791469664.html But these are just examples of found auctions and I am not sure about the quality of the offered goods. --- Quote from: Fungus on July 09, 2023, 06:57:49 am --- --- Quote from: Shonky on July 09, 2023, 04:53:50 am ---AD584LH on the linked one is likely fake on these as they haven't been made in quite a while - 10 years or more. The picture does show a 1223 date code, but well... you know... --- End quote --- I think they're likely to be second hand chips pulled out of old devices. (i.e. well burned-in :) ) --- End quote --- Yes, in mine there is a 100% old chip desoldered from some device, you can see it by the condition of the metal housing. |
| Fungus:
--- Quote from: tomud on July 09, 2023, 09:31:36 am ---This is just a description, and the photos in the comments clearly show that there is no voltage measurement sheet attached. --- End quote --- My sheet was stuck to the bag it came in (see pic). But yeah, I just picked that seller because the sold a lot and had a good rating. If you go through all the reviews there's a couple that say there's no "passport" so maybe that's not the one to get. Get one that clearly shows numbers in the listing photos so you can reclaim easily if it doesn't have them. :-) |
| tomud:
--- Quote from: Fungus on July 09, 2023, 10:40:48 am --- --- Quote from: tomud on July 09, 2023, 09:31:36 am ---This is just a description, and the photos in the comments clearly show that there is no voltage measurement sheet attached. --- End quote --- My sheet was stuck to the bag it came in (see pic). --- End quote --- That's all I know :) That's why I looked at the pictures in the package and I didn't notice that the voltage measurements were glued to the bag. And of course, information in the comments about the lack of voltage measurements: "Everything works. Asked the seller to put a passport of factory measurements, but whether he forgot, or scored, or he does not have that. Ignored the request in short. Did not answer anything. Measured on a precision voltmeter-all in admission." "There is no passport for the microcircuit and no factory control measurement. What exactly voltage gives out and how to calibrate something with this voltage is not clear. In general, within the margin of error in the dataite, The microcircuit fits well. For instruments with 2 decimal places will come down." btw there are still such "reference modules" RLC available https://www.aliexpress.com/item/33040571353.html |
| Veteran68:
--- Quote from: Fungus on July 09, 2023, 03:36:22 am --- --- Quote from: KungFuJosh on July 09, 2023, 01:09:13 am ---Got a link for that one? I can't find it. --- End quote --- The sticker says I bought it in 2017 so exact models have changed since then. Today's equivalent is probably this: https://www.aliexpress.com/item/32658819804.html The ad says "10. Each board at the factory to be detected with Aglient 6 digit multimeter, and marked with the output voltage, user-friendly." (nb. Random seller...I have no idea if they're good but they've sold 65 and got good reviews) --- End quote --- This is the one I mentioned earlier I have that takes the wonky 15V battery, unless you use a DC barrel jack (which is what I do now after buying a couple of those expensive batteries). Mind did come with the highly desirable AD584LH version of the reference. Obviously pulled from something. Mine came with a "cal" sheet as shown. Haven't used it in forever, just checked and measured 5.00112 and 10.00183 with my 34401A. Not too bad I guess for 8 years old, if that cal date is even accurate. But the fact they went to the trouble to type & print this cal sheet makes me suspicious that they just printed off a bunch and stick the same one in each shipment, lol. |
| Shonky:
--- Quote from: Veteran68 on July 09, 2023, 08:28:58 pm --- --- Quote from: Fungus on July 09, 2023, 03:36:22 am --- --- Quote from: KungFuJosh on July 09, 2023, 01:09:13 am ---Got a link for that one? I can't find it. --- End quote --- The sticker says I bought it in 2017 so exact models have changed since then. Today's equivalent is probably this: https://www.aliexpress.com/item/32658819804.html The ad says "10. Each board at the factory to be detected with Aglient 6 digit multimeter, and marked with the output voltage, user-friendly." (nb. Random seller...I have no idea if they're good but they've sold 65 and got good reviews) --- End quote --- This is the one I mentioned earlier I have that takes the wonky 15V battery, unless you use a DC barrel jack (which is what I do now after buying a couple of those expensive batteries). Mind did come with the highly desirable AD584LH version of the reference. Obviously pulled from something. Mine came with a "cal" sheet as shown. Haven't used it in forever, just checked and measured 5.00112 and 10.00183 with my 34401A. Not too bad I guess for 8 years old, if that cal date is even accurate. But the fact they went to the trouble to type & print this cal sheet makes me suspicious that they just printed off a bunch and stick the same one in each shipment, lol. --- End quote --- There are some suppliers that definitely were supplying the exact same printed sheet similar to that one with every unit. The ones that come with hand written sheets appear to be more genuine. The ones that actually are tested seemed to be closer to their cal sheets than yours is. |
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