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The SD data logging functionality is in the meter, is advertised, and is not working at the moment.
I do use two 121GW for few months, but recently started doing some extra data logging intensively (which is the reason I got this meter really), and unfortunately it is broken in many ways. I tested both, 1.57, and 2.00 fw.
- SERIOUS: After some time of data logging to SD card, it stops updating values in the file. LCD is showing proper values, and says that new records are added to the file. However the file only starts having 3 values cycling forever (flat line forever). This can start after 1000 records, or after 10000, or somewhere in between, hard to say. If I do a data logging for a 3 days, it is 100% certain my data file will be ruined, and experiment waste of time, and possibly money. The worst part is you only learn about it later, when you read files back on a computer. Example at the bottom.
0 3959
1 219
2 54
3 44
4 54
5 43
6 28
7 11
8 11
9 11
10 11
11 11
12 11
13 11
14 11
15 11
16 11
17 11
18 11
19 11
20 11
...
2032 11
2033 11
2034 11
2035 11
2036 11
2037 11
2038 11
2039 11
2040 11
2041 11
- CONSIDERABLE: It looks like a there is a limit of 600000 records, after which the logging automatically stops. Please rise it at least 100 times, as I don't see much reason to have it, and it is somehow limiting.
- SERIOUS: When having Interval of 0, the sampling rate is very non uniform, sometimes doing 1 per second, sometimes 10 per second, sometimes stopping for some time. And because records don't have timestamp, it makes data logging at interval 0, totally useless for anything, there is no way to reliably use them for anything. This comes back to the 4th point above.
There are some other minor things that do bother me about the 121GW, but really, the data logging issues are the biggest problem right now, making it not usable at the moment.
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The SD data logging functionality is in the meter, is advertised, and is not working at the moment.Hm, it is working, but with an issue, in the moment. This meter is rel fresh and need some community support, as it is defined to be. Your longtime logging is a little worst case scenario, even for meters like the Keithley DMM6500, imho. Maybe you need an other meter for that, or look inside the firmware by yourself (don't know it is open source - hackable too).
Wish good luck.
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- SERIOUS: When having Interval of 0, the sampling rate is very non uniform, sometimes doing 1 per second, sometimes 10 per second, sometimes stopping for some time. And because records don't have timestamp, it makes data logging at interval 0, totally useless for anything, there is no way to reliably use them for anything. This comes back to the 4th point above.
It seems that the meter likely blocks while writing to SD card. By turning logging quickly on and off several times I managed to block DMM completely for a few (about 10) seconds.
I even started thinking that it died, but then it unblocked on its own, so I am pretty sure writes to SD card are synchronous.
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The SD data logging functionality is in the meter, is advertised, and is not working at the moment.Hm, it is working, but with an issue, in the moment. This meter is rel fresh and need some community support, as it is defined to be. Your longtime logging is a little worst case scenario, even for meters like the Keithley DMM6500, imho. Maybe you need an other meter for that, or look inside the firmware by yourself (don't know it is open source - hackable too).
Wish good luck.
I don't think firmware is open source. I tried to find it, and debug, add some features, but can't find it anywhere.
Darn, there are so many issues around data logging on this thing...
Was also one of my main reasons to get it.
But it's crazy to get to Data, screw open instead of BT File access.
No timestamps, instable on long measurements...
What's a better logging meter at around that price range? Or, how far up to get something better?
Any recommendations?
after Dave multiple comments about his intent for this thread
But someone quite going into the details like Dave, i expected every feature to be reasonably usable. SD under screws is... well, not thought through at all. Seems like a marketing gimmick, unless it was thought to be used with BT file access, which was maybe cut out due to no time/money to finish it, is what i guess.
Your criticism is based on ignorance. Many of us have been following the development of the 121GW for quite some time. (snip)...BTW - These things have been discussed before.
The fact is it doesn't have an easy way to see/download the data logging . This is a fair criticism . You should have pointed out clearly this deficiency at the "supporters area" early discusions
A fully custom EEVblog Electronics Multimeter designed by Dave & UEI, with many exclusive features like SD card logging & Bluetooth!
The fact is it doesn't have an easy way to see/download the data logging . This is a fair criticism . You should have pointed out clearly this deficiency at the "supporters area" early discusions
Do you really go out of your way to be an ASSHAT?
Data being logged to an internal card at speed that is the same as on the display is not an 'issue' and you once again are being a TROLL !
I'm not entering the war here, just commenting on my experience with the bluetooth logging...
I have tried to log my solar powered golf cart dozens of times and have not once had the logging last an entire day-light span. Sometimes it will log for a few hours, sometimes less than 5 minutes before updates just stop, Android tablet on plug power 5' from the 121.
Note: I have not tried with the 2.0 FW update, have since moved to a different meter.
The fact is it doesn't have an easy way to see/download the data logging . This is a fair criticism . You should have pointed out clearly this deficiency at the "supporters area" early discusions
Do you really go out of your way to be an ASSHAT?
Data being logged to an internal card at speed that is the same as on the display is not an 'issue' and you once again are being a TROLL !
I"m a troll for fanboys like you , the logging has issues not just the physical acces , a pain in the butt because they couldn"t do it wirelessly or add a normal computer interface . Whatever ...
It’s too bad Fanboys and Trolls are such a major issue with the 121gw as their posting seems to drown the real hardware and firmware problems being reported.