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EEVBlog 121GW Multimeter Firmware Details

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gdewitte:

--- Quote from: joeqsmith on December 07, 2018, 06:40:56 pm ---It's clearly (at least to me) stated in the manual.  … 

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Where in the manual is it clearly stated? I just searched the latest manual (revised 04 Dec. 2018) for things like "55" and "current" and had no returns relating to a 55 mA maximum.

darik:

--- Quote from: gdewitte on December 07, 2018, 07:24:06 pm ---
--- Quote from: joeqsmith on December 07, 2018, 06:40:56 pm ---It's clearly (at least to me) stated in the manual.  … 

--- End quote ---


Where in the manual is it clearly stated? I just searched the latest manual (revised 04 Dec. 2018) for things like "55" and "current" and had no returns relating to a 55 mA maximum.

--- End quote ---

In the version 1.22 manual I have on my drive it states it on page 16, where it details the current ranges, and on page 32, where it details the different jacks.

And of course since taking current measurements that are out of range is one of the easiest ways to damage a meter or at least blow a fuse, we _all_ familiarize ourselves with the limitations of the current ranges before using them. Right?

HKJ:

--- Quote from: Terry01 on December 07, 2018, 07:29:58 pm ---
--- Quote from: HKJ on December 07, 2018, 07:10:03 pm ---
--- Quote from: Terry01 on December 07, 2018, 06:14:02 pm ---Yes I agree. I incorrectly assumed the meter was lying to me but lets be clear the meter is hardly 100% trust worthy is it? There are loads of posts of the meter lying or not doing what it's supposed to or whatever. I can hardly be faulted for thinking it was just something else wrong with it.

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I have not seen that, in some extreme cases the meter shows wrong values, in normal usage it may be slow or it may be unstable, but it do not show wrong values.
This is something you have to know about every meter you use, where is it correct and stable, where may it show wrong value and where is it wrong most of the time. I do not remember it for all my meters, but if the value is outside expected values I check with another (or more, even a scope) meter.

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You say it shows wrong values then it doesn't show wrong values in the same sentence. You say it is slow  or unstable... this is not wrong values??

I did check it with another meter, 2 in fact U1273a and 87v.

next.....  :horse:  :horse:  :horse:  :horse:

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It may show wrong value at high megaohms. In current it may have a zero offset (As I note in my review), this is not ideal, but easy to handle. The low burden voltage has a price.
In some ranges the auto range do not work, this is easy to fix: Use manual range.

The meter is not perfect, but I do not see it as unreliable. I hope it will get better with some software updates, making it easier to use in all situations.

Note: For me a unreliable meter is a meter where you cannot see that it is showing a wrong value (when you are within specifications).

HKJ:

--- Quote from: Terry01 on December 07, 2018, 08:30:26 pm ---On this we agree  :)

--- End quote ---

Just to clarify (Others can add more points):

* Offset do not make a meter unreliable, but is inconvenient, even if the meter has a REL function.
* Measuring frequencies (including harmonic) outside the specifications  is not expected to show correct values, but high sensitivity for specific frequencies may rate as slightly unreliable. Like changing reading when a mobile phone is near the meter (I would rate it as silly to measure with high RF fields around).
* Auto range jumping around, this is a software fault in the meter, but do not make it unreliable.
* Problems with mixed AC+DC signals. I do not really now how to rate this, as long as they are of similar amplitude I expect the meter to handle it, but when there is a huge difference most meters will be unreliable.
* Sensitive to hands near the meter, this is easy to see and do not make the meter unreliable, but is very inconvenient
As can be seen from the list, there is a lot of stuff I do not like, but I would not call the meter unreliable due to it.

The 121GW is not my main meter and will probably never be, it is too slow. But is has some functions that I like and this means I keep it within easy reach and do use it.

HKJ:

--- Quote from: Terry01 on December 07, 2018, 09:33:34 pm ---I like to use all my meters.

--- End quote ---

I have way to many meters for that, I have a few hand held meters I use for checking stuff (That includes the 121GW) and some bench meters I use when I want precise result (Keithley, Fluke  and Keysight).

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