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| Second DMM ? |
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| luudee:
--- Quote from: JoeRoy on September 24, 2023, 02:39:41 pm --- AFAIK, most 6.5 and 7.5 digits DMMs share the same Voltage Reference, then, after 1-2 years they will have basically the same accuracy, although the 7.5 can give you an extra decimal (useful to perceive small variations). --- End quote --- Thank you for the reply, JoeRoy. I read that the 6500 uses 16 bit resolution, and the 7500 uses 18 bit resolution. Wouldn't that give the 7500 *continues* better performance if it is calibrated annually ? Kind Regards, luudee |
| luudee:
--- Quote from: HKJ on September 24, 2023, 02:38:42 pm --- I have not seen a DMM7500, but have both the DMM7510 and DMM6500. They are not the same, even though the screens looks similar and they have about the same functionality. Some difference: The DMM7510 has a rotary encoder, this makes it possible to use it without the touchscreen (If it ever fails). The DMM7510 has light in its buttons. The DMM6500 has a slot for a switch module, i.e. it can be used to monitor multiple channels. The DMM6500 has some special support for apps (Some can be downloaded from Keithley) Note: They can both run scripts. On the DMM6500 the amp fuse can be changed from the front. My DMM7510 has a considerable more noisy fan than my DMM6500, for this reason I mostly use the DMM6500. The DMM6500 is a slightly never design and if you don't need the extra digit I believe it is a much better package. --- End quote --- Thank you so much for the feedback HKJ. I'll check the apps that are available on the keithley website and see if there is anything I can not live without, lol ... Many Thanks ! Kind Regards, luudee |
| luudee:
Guys, I just found this PDF, it lists all (??) Tek/Keithley DMMs and their features ... Of course, we will still need your help and feedback, as some things might be missing (such all available apps), and real user experience is priceless !!! Perhaps this can be useful to others ! Cheers, luudee |
| JoeRoy:
Let me give you another opinion, although you said "should have at least the functionality of the Siglent, but preferably slightly better." Seems like you are even not using the full performance of your SDM3065, try to explore what it can do, as I said before, if you have the Scan card option would be very useful to your lab. You said "calibrated annually", sending (even locally) a DMM for calibration is not so simple, there are movements, temperature variation, risks, etc. If you really, really need accuracy, you will also look for stability and not another 6 1/2 DMM, but 8 1/2 digits (used) DMM could be your goal (check "Marco Reps" channel). I personally prefer a good 50k counts handheld DMM, they are convenient to use, robust, stable, and precise/accurate for 99.99% of electronics projects. I'm not a big fan of Keithley DMM6500 because of its highest Burden Voltage: https://lygte-info.dk/review/DMMKeithley%20DMM6500%20UK.html https://download.tek.com/document/SPEC-DMM6500A_April_2018.pdf https://siglentna.com/USA_website_2014/Documents/DataSheet/SDM3065X_DataSheet_DS06036-E02C.pdf |
| Hexley:
--- Quote from: luudee on September 24, 2023, 02:07:45 pm ---Guys, quick follow-up question, I noticed Kithley has also a DMM7500, which is 7.5 digits. Is the 7500 identical to the DMM6500 (except higher resolution) ? Also, looks like they have a DMM7510. How does that compare ? Many thanks ! luudee --- End quote --- For some interesting background on the 6500 and 7510, you might check out this thread, with particular attention to the postings by user E-Design, who says he worked on the 7510 design. https://www.eevblog.com/forum/testgear/dmm6500-dmm7510-vs-34465a-34470a-ac-readings/msg3929483/#msg3929483 |
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