Products > Test Equipment
EEVBlog 121GW Multimeter Firmware Details
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Terry01:
I know this is a tiny bit off topic for this particular thread but for those who are interested in V 1.54 firmware, I just did a quick check of all the modes and ranges on my new 121GW that came with the V 1,54 firmware installed from Welectron yesterday.

I tested it alongside 6 other meters doing a general function test, i checked caps, resistors, diodes, voltages and currents of all different values and sizes and it was very close in every test same as the rest of the meters were. I didn't expect them to match exact to the last digit.
I didn't notice it to be particularly slow either or anything like that in any particular mode.
The only thing I didn't test was the mvA/VA feature as I don't know exactly how it works to test it. I'll learn that soon enough though.
To sum up i am happy with the meter so far in how it performs.

Hope this is of interest to someone.
thaistatos:
is there an improvement of the slow reading of resistance?
rattnallen:
Firmware version 1.57 at https://www.eevblog.com/product/121gw/
Terry01:

--- Quote from: rattnallen on November 21, 2018, 02:19:25 pm ---Firmware version 1.57 at https://www.eevblog.com/product/121gw/

--- End quote ---

I saw that but there was no V 1.54 which I thought was a bit strange. I'll wait and see as I am happy with it just now.
exe:

--- Quote from: PeterL on November 10, 2018, 07:31:38 pm ---And I hadn't even heard of ChibiOS. Can you share what you have so far?

--- End quote ---

Uhm, not much, just a proof of concept for another project: https://github.com/kopchik/psu_firmware/blob/master/main.cpp . I use ChibiOS because:

1) reasonably simple API
2) Supports Linux (and any other sensible OS)
3) Provides threads and queue support. This is a must for me for any async UI development.
4) Sources are written by humans, not a typical autogenerated rubbish :)
5) I don't care about power consumption, if a DMM gonna work 50hrs from batteries instead of 600h it's still fine provided firmware is better than the stock one.


PS I think I'll finish my other projects first before jumping on this train. Don't want to spread too much.
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