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EEVBlog 121GW Multimeter Firmware Details
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Dirk C.:

--- Quote from: thaistatos on November 21, 2018, 11:53:45 am ---is there an improvement of the slow reading of resistance?

--- End quote ---

In Auto Mode it is not fine, slow.
In manual mode the measurements are very fast.

Version 1.57

Dirk
chronos42:
Hi,

there is indeed an extra digit.
I have made some test and found this:

In the higher ranges the meter is still slow but accurate and has a higher resolution.

DER EE 5000 as reference meter, 100nF (MKT type capacitor) @1khz : 113.68nF

Agilent 1252B : 114.2nF
Brymen BM869S : 114,4nF
UNI-T UT201E (cheap clamp meter) :114.4nF
121GW: 0.1129µF


So far so good, all meters are doing a good job.

Next with a 220pF ceramic NP0 capacitor:

DER EE 5000 as reference meter, 220pF@10khz : 238.3pF

Agilent 1252B : 0.234nF
Brymen BM869S : 0.24nF
UNI-T UT201E (cheap clamp meter) : 0.240nF
121GW: 0.165nF

All meters are spot on, except of the 121GW which is way off and not even close to 220pF. It seems that the low capacitance range now is messed up. Can sombody reproduce this issue?
exe:
There is a separate thread for reporting bugs, and another one for general discussion. It's unlikely to get much support in this thread.
CDaniel:
Sub 1nF readings drift and are affected by noise , if you touch the probes , etc , this must be investigated further . I don't think it is normal ... another issue maybe . If I used REL just before the measurement and I didn't touch anything was accurate for low capacitance  ... but needs more testing .

If you touch only the red probe tip you can get a reading of a few nF , this it is not scientific but an indication that is not very ok .
chronos42:

--- Quote from: joeqsmith on November 23, 2018, 09:09:25 pm ---

What versions of firmware were you testing?  What were the values reported for that version?   How long did you allow the 121 to settle?

--- End quote ---

Hi,

sorry, I forgot the version information.
It is 1.57.
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