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EEVblog 121GW Multimeter Issues

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BILLPOD:

Posted by: vulpes
« on: Yesterday at 08:31:30 am »

    Insert Quote


Is this meter worth getting now? Have the firmware issues been fixed after some years in production?
I'm torn between this and Brymen 869, but I'd appreciate a smaller size and Bluetooth on GW121.

Good Morning Vulpes,   I got my GW121 about a year ago and mine works beautifully.  No issues whatsoever.  It has become one of my favorites.   :-DMM

_

vulpes:
Thanks for the response. Is the continuity mode fast now, since I will be using it a lot? And when it comes to the readings speed, are you satisfied with it? Sluggishness of the meter seems like the most commonly mentioned issue of the GW121.

BILLPOD:
Good Morning Vulpes,  The 121 is as fast as any of my meters,
which include Flukes and Brymens.   What I love is the ability to use  the continuity feature in what I call 'reverse mode', where you can set it to beep on broken continuity,....great for checking
the integrity of wires and cables.   :-DMM

J-R:
Continuity speed was never an issue with the 121GW as far as I'm aware, but the resistance autorange speed is on the slow side.  That has not changed.

In general it's a slow DMM, although it depends slightly on what you're doing with it.  Probably slowest DMM I've ever seen personally is the Keysight U1461A when set to autoV with DC+AC on the secondary display.  Can be many seconds for it to come to its senses.  Basically it has to decide AC or DC and the range for the primary, then calculate the secondary display.  In other configurations is plenty fast.

So consider your use case.

Nothing compares to a fast bench DMM with a VFD display.  I had previously suggested the Fluke 8840A/8842A with Slow/Medium/Fast modes.  In medium/fast it's about as instant as you can get.  Resistance from full scale to zero is maybe 1/4 second.

jeraymond:
Hello — I'm seeing a problem where the 121gw shows incorrect frequency period. From my waveform generator I feed in a 0-5 V square wave at 1 kHz with a 50% duty cycle. The meter correctly shows a 1.0000 kHz for frequency, but a period of half the expected value at 0.4999 ms. Oddly adjusting the duty cycle changes the period measurement as well. With a 70% duty cycle at 1 kHz the period now reads 0.6999 ms. It seems to be missing the later half of the waveform in the period measurement.

Anyone else see this problem? I'm running the latest 2.05 firmware.

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