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Re: Decent DMM for around $250?
I built something like this:
http://archive.siliconchip.com.au/cm...3/article.htmlComment
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Re: Decent DMM for around $250?
I just need to get a couple of those laser trimmed chips... augh...
I actually found some reference voltage chips but they are not exactly as accurate as what you can get, alas it may be good enough. Forgot what they were off the top of my head, but the thing I was a bit worried about is that these are SMT chips and soldering them may affect their trim...
I guess DIP may be better in this respect as long as you don't draw too much current...Comment
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Re: Decent DMM for around $250?
Maxim provides free samples ...
Here is another chip:
https://cdn.badcaps-static.com/pdfs/...7d2214fb0f.pdfComment
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Re: Decent DMM for around $250?
Ah REF198GS is what I have... Unfortunately it looks like it's 4.096V +/- 10mV so it's pretty inaccurate, but might be good enough, though still pretty horrible though.
Now the other problem is that at 4.096V, I'd need to locate 0.1% resistors or something to make a voltage divider to get it within the 4-digit 1999 count... Or I might go ahead and try to "bin" a few resistors that I already have that match each other, and use those to make a 3:1 voltage divider...Comment
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Re: Decent DMM for around $250?
you are probably wasting your time once you allow for the volt-drop in the cables and connectors.Comment
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Less jewellery, more gold into electrotech industry!
Half of the computer problems is caused by bad contacts 
Exclusive caps, meters and more!Hardware Insights - power supply reviews and more!Comment
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Re: Decent DMM for around $250?
Actually the MAX6350 has an initial accuracy of ±0.02%, so that's 5.000V +/- 0.001V, not 5mV. Sorry for my error.
https://cdn.badcaps-static.com/pdfs/...9ffece5239.pdfComment
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Re: Decent DMM for around $250?
+-1 mV, still the same level than most these better multimeters measure. Should be at least a digit more precie than the multimeter itself I'd say.
In this case it may be used for the UT61B as it has 4V and than 40V range, but some other meters have even 6V range so they could measure 5.000 V.Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts
Exclusive caps, meters and more!Hardware Insights - power supply reviews and more!Comment
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Re: Decent DMM for around $250?
Why buy a Fluke then?
BTW, my tester has the 5.000V, 4.096V, and 2.500V references.Last edited by fzabkar; 11-25-2015, 02:50 PM.Comment
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Re: Decent DMM for around $250?
The 10M ohm input impedance on the "better" meters and this isn't that big a deal - the resistance of the cables and connectors are several orders of magnitude off from the resolution of the display (except in amperes mode). But it would be nice to at least know if the pots on the meter haven't been disturbed.
I did notice my Tek (probably at least 35 years old) and Fluke (probably 25 years old), after all the years they've been out after leaving the factory, still match each other except the last digit, typically by one count (Tek is 1999 count, Fluke is 3199 count). All my other meters are all over the place.
I think my LED Viz meter has the most error from the Tek/Fluke comparison (surprisingly NOT a HFT meter) alas I have no idea how to calibrate it, too many pots on the board...Comment
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Re: Decent DMM for around $250?
Heat up the area close to the trim pot with a solder iron tip (but not touching the trim pot) or use freeze spray on the pot as per this video.
https://www.youtube.com/watch?v=B9E4XpUfoc8
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Re: Decent DMM for around $250?
There are around 5-10 trimpots IIRC in the Viz... The recent LCD DMM's I've only seen 1 or 2 at the most...Comment
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Hi. I think we have a candidate for our first DFU macbook with a 'critical update error' message (A1706).
With regret, we do not seem to have a machine to mate to a suitable host to run the Configurator 2 tool.
Any suggestions on such a box ? The latest models are quite expensive on Ebay and such.
We do have a macbook with the older style Thunderbolt connector - can we purchase a Thunderbolt to USB C cable and run the same tool ?
The system details does show a THUNDERBOLT controller on this other macbook.
Does the host need to have... -
Hi everyone,
I am trying to fix a samsung washinmachine power supply main board.
I already replaced it with another one to fix the machine but i want to try understand the issue with the old board.
Therefore i hope to be able to get some help to explain what to check in order to troubleshoot.
The power supply board reference is the following: DC41-00189a
I have followed one thread (https://www.badcaps.net/forum/troubl...ingmachine-rel... -
Hello there everybody, I'm not sure if it's the right topic to ask this but I hope so.
I have a CNC machine wired to 3-phase 230V AC.
It's a smaller CNC machine with a 3500W motor, do it does not uses much power.
The problem is, when the residents come home and put load on the network, the voltage can drop to around 207V which is fine for most household items but by CNC machine stops working from this.
I contacted the electricity company but they refuse to help me solve this problem.
So I started to look around for some DIY... -
Hi all,
I got a 820-01700 of a friend that doesn't turn on. I read that a typical issue with these boards is the TPS62180 generating the NAND voltages, so this is where I started looking. Sure enough, PP2V5_NAND_SSD0 is 4V when the machine tries to turn on (I try to determine this by measuring PP2V5_NAND_SSD1, which is 2.5V as it should in this case. The PP0V9_SSD0 and PP1V8_SSD0 power supplies for the SSD are on at the same time when PP2V5_NAND_SSD0 is 4V). The extremely weird thing is that when the machine is off (PP2V5_NAND_SSD1=0, PP0V9_SSD0=0 and PP1V8_SSD0=0), PP2V5_NAND_SSD0...
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