Products > Test Equipment
EEVBlog 121GW Multimeter Firmware Details
<< < (56/62) > >>
1anX:
I see firmware V2.02 is available!
https://www.eevblog.com/product/121gw/
amspire:

--- Quote from: 1anX on September 28, 2019, 07:11:53 am ---I see firmware V2.02 is available!
https://www.eevblog.com/product/121gw/

--- End quote ---
And a new manual update.

Looks like they added a check of the battery voltage before doing a firmware update in the latest release. Sounds like a good idea.
daveyk:
I'm still not thrilled with resistance mode.  It is still somewhat slow, but putting the two leads together, it takes 2.5 seconds and then readings float between .018 to .103 ohms.  The longer you hold the leads together the more the resistance reading goes up.  V2.02, I believe is better than v2.00 in resistance.  I've swapped leads and same thing.  Perhaps the leads I have are not ideal, but resistance readings so sluggish make it hard to use for trouble-shooting.  Its hard to know when to press the REL button as it takes a while for the readings to settle down when shorting the leads together.

On another subject, has anyone thought to do some customer firmware for working on older automobiles?   I want to read RPM with a clamp-on probe (already have) and then drell angle (not real familiar with that).  I am fixing-up (not down, but it is currently - lol) a 1974 Beetle as a hobby.  I bought an automotive meter that is supposed to do this, but what a piece of fragile crap.  RPM is basically reading frequency.  I couldn't get that meter to read the RPM consistently.  I have no idea what dwell angle is, but when I get to tuning the engine they say at a certain RPM set the timing for a dwell angle of xx.  Anywho, I don't expect that, but did wonder if people have been doing customer firmware for this meter.

Dave
npelov:
Since v2.0 the SD card logging stops working properly after a while. I haven't tried that in 2.02. The last time I recorded voltage for 19.5-20 hours with interval 2 seconds, fixed range. I monitored the display - the battery dropped gradually with cut off at about 10.8V. At about 19.5 hours the voltage was 11. At 19.0 hours - 11.8V. However since about 2h 40min (about 4800 recods) the value in csv is  12.529V +/- 3 LSD. The last digit keeps moving around like it's recording real data, but it has nothing to do with what's on the display.

I've reported this before, but I don't see it in firmware change log. Is this fixed? Does anyone else have similar problems?

Edit: Also since v2.0 the multimeter will occasionally freeze when I start logging - switching ranges, pressing buttons have no effect, until I turn it off.

P.S. Yes, I know that bluetooth exists. I don't want to rely on wireless for long term logging.
eV1Te:

--- Quote from: npelov on November 29, 2019, 12:25:06 pm ---Since v2.0 the SD card logging stops working properly after a while. I haven't tried that in 2.02. The last time I recorded voltage for 19.5-20 hours with interval 2 seconds, fixed range. I monitored the display - the battery dropped gradually with cut off at about 10.8V. At about 19.5 hours the voltage was 11. At 19.0 hours - 11.8V. However since about 2h 40min (about 4800 recods) the value in csv is  12.529V +/- 3 LSD. The last digit keeps moving around like it's recording real data, but it has nothing to do with what's on the display.

I've reported this before, but I don't see it in firmware change log. Is this fixed? Does anyone else have similar problems?

Edit: Also since v2.0 the multimeter will occasionally freeze when I start logging - switching ranges, pressing buttons have no effect, until I turn it off.

P.S. Yes, I know that bluetooth exists. I don't want to rely on wireless for long term logging.

--- End quote ---

This sounds like a serious issue, however I am confused how to reproduce this...

The total battery voltage in the 121GW should be about 6 V, not 10.8 to 11.8 as you mention. There are 4 batteries, not 8.

What was the voltage source that you measured? Was it a constant voltage of 12.529 or did it change during the measurement? Did you check the voltage with a different meter during the test to confirm that the 121GW indeed measured/logged incorrect values?



Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod