EEVBlog 121GW Discussion thread

[skyjumper]

Hi All, this weekend I blew the 400mA 600V fuse. I'm in the US, and Dave's fuse pack would take some time to get here. I see lots of 600V 500mA fuses available, not so much with the 400mA. Could I safely use a 500mA fuse instead?

[Wytnucls]

The range is 500mA, so the 500mA 600V fuse is fine, if it has a FF rating (Fast) and a high breaking capacity (10kA).
6x32mm, rated for AC/DC (UL248-1)

[skyjumper]

Thanks very much, I thought as much but this makes me wonder why there is a 400mA fuse to begin with? Although I did end up finding some 400mA @ 600V, are these acceptable:

https://www.amazon.com/gp/product/B0891P5XMM/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

[Wytnucls]

Stick to good brands, like Littelfuse, Cooper Bussmann or Siba if you can, otherwise examine the datasheet carefully for compliance.
The manual recommends  cryptically ASTM HV610.0.4 400 mA (600V) or HV620.0.4(1000V) A/500 mA current input fuse (sic)

[skyjumper]

Stick to good brands, like Littelfuse, Cooper Bussmann or Siba if you can, otherwise examine the datasheet carefully for compliance.
The manual recommends  cryptically ASTM HV610.0.4 400 mA (600V) or HV620.0.4(1000V) A/500 mA current input fuse (sic)

Ah okay, well if 1000V fuse is acceptable then there are many 500mA to choose from. Thanks.

[Brumby]

This:

Stick to good brands

[AVGresponding]

This:

Stick to good brands

And make sure the spelling is correct! Poor spelling invariably indicates counterfeits that have no sand inside to quench the fault arc, something I'm seeing more of in the UK with BS1362 fuses.
They can and do explode under fault loading.

[skyjumper]

I have Dave's fuse pack on order, but that will take 15 days and I can't wait that long to get this back into service. I should have stocked up on fuses for it, but it never occurred to me they would be hard to find on short notice. In the meantime I'll use the one I ordered and be super careful not to screw up again. Maybe the international postal Gods will smile on me :-)

[EEVblog]

Stick to good brands, like Littelfuse, Cooper Bussmann or Siba if you can, otherwise examine the datasheet carefully for compliance.

Beware of fakes on ebay and other places. Because of the very high potential margins on these, the market is awash with fakes.

[tmcks]

Hi all,

I received my 121GW today. I went to check the firmware and I see v2.04 is the highest listed on the 121GW firmware page, but the start screen on the DMM shows v2.05. Is this an error and I should flash 2.04, or is 2.05 real and just not listed yet?

Thanks.

[firewalker]

Hi all,

I received my 121GW today. I went to check the firmware and I see v2.04 is the highest listed on the 121GW firmware page, but the start screen on the DMM shows v2.05. Is this an error and I should flash 2.04, or is 2.05 real and just not listed yet?

Thanks.

Probably not listed yet. Check the contents of the microSD card. If you see a file named EEVBlog.bin, share it with us. 

Alexander.

[tmcks]

Probably not listed yet. Check the contents of the microSD card. If you see a file named EEVBlog.bin, share it with us. 

Alexander.

Sorry, but the SD card seems to be empty.

[EEVblog]

Hi all,
I received my 121GW today. I went to check the firmware and I see v2.04 is the highest listed on the 121GW firmware page, but the start screen on the DMM shows v2.05. Is this an error and I should flash 2.04, or is 2.05 real and just not listed yet?
Thanks.

I don't have have 2.05, have asked Kane what the deal is.
I have new stock on the way soon, don't know what version they will have. I can only presume that you bought it from Welectron and they somehow have a newer version firmware.

[tmcks]

Hi all,
I received my 121GW today. I went to check the firmware and I see v2.04 is the highest listed on the 121GW firmware page, but the start screen on the DMM shows v2.05. Is this an error and I should flash 2.04, or is 2.05 real and just not listed yet?
Thanks.

I don't have have 2.05, have asked Kane what the deal is.
I have new stock on the way soon, don't know what version they will have. I can only presume that you bought it from Welectron and they somehow have a newer version firmware.

Yes, it is from Welectron.

Thank you.

[EEVblog]

I now have v2.05
They changed the low pass filter curve to better match the performance of the Fluke 289, which I guess they are using as a sort of reference.
And yes, this version was shipped to Welectron.

[J-R]

Flashed without incident.

[e0ne199]

I now have v2.05
They changed the low pass filter curve to better match the performance of the Fluke 289, which I guess they are using as a sort of reference.
And yes, this version was shipped to Welectron.

is that the only update??

[EEVblog]

I now have v2.05
They changed the low pass filter curve to better match the performance of the Fluke 289, which I guess they are using as a sort of reference.
And yes, this version was shipped to Welectron.

is that the only update??

Yes. That is the only change they said was made.

[commandlinehool]

Also got mine from electron today with 2.05. Also the yellow shim have been removed?

Does it always comes without probes? I thought it’s either Brymen or UEI probes.

Cheers

[EEVblog]

Also got mine from electron today with 2.05. Also the yellow shim have been removed?

Yes, the shim was only for the first several thousand PCB's that had the wrong thickness.

Does it always comes without probes? I thought it’s either Brymen or UEI probes.

I don't have control over what Welectron sell, but Kane's standard FOB quote is without probes. If the distributor wants probes then they have to order them as a separate line item.

[J-R]

By default Welectron checks the box to include the probes when you hit the 121GW page, but you can uncheck it.

I have two 121GW units that came with shims.  I removed it from both and have had zero issues.  Perhaps after things wear it might be needed.

[commandlinehool]

Also got mine from electron today with 2.05. Also the yellow shim have been removed?

Yes, the shim was only for the first several thousand PCB's that had the wrong thickness.

Does it always comes without probes? I thought it’s either Brymen or UEI probes.

I don't have control over what Welectron sell, but Kane's standard FOB quote is without probes. If the distributor wants probes then they have to order them as a separate line item.

Thx for the reply. I didn't know they aren't stock included.

By default Welectron checks the box to include the probes when you hit the 121GW page, but you can uncheck it.

I have two 121GW units that came with shims.  I removed it from both and have had zero issues.  Perhaps after things wear it might be needed.

Yeah, I thought there were some included, so I unchecked it  .  Got myself some Fluke Probes now, maybe have to shorten the banana plugs a bit but otherwise they work fine.

Yeah, I wanted to remove them to avoid issues and found out they aren't there anymore.

[Timz]

Yeah, just received 121GW 2 days ago, and the firmware reads 2.05,  no idea if that's actually from Welectron, but I ordered it directly from EEVBlog shop online.  Delivered to UK by DHL courier and it originated from Australia.

Happy with this product so far.  Thank you so much.

[dzenbo]

Hi, I have not read all thread trough so maybe this note will be not a new. But in my opinion AutoHold mod is slightly raw, especially in resistance measurement - it takes all my time to get value of a single res. In the same time in a basic mode I see that the value jumps in a least significant digit only. And it is very disapoint that I cant check 5% resistors over the board as fast as I have expected 
I understand that design and consumer satisfaction it is all about trade-offs. But my vision of this process is to give user freedom to select between A) more digits, sometimes more noise and more time to get a value, and B) less digits - faster response.

We have a "1 kHz" mode which enables filter. So maybe it is reasonable to make it available for other modes?

One more. Looks that the AutoHold mode does not depends of Auto range or particular range is selected. I thought the overall time to get hold the value is a sum of the time required to find the range and the time required to ensure that the value is stable. But looks that it is not. Very strange

If required I will make a video report later.

[EEVblog]

Yeah, just received 121GW 2 days ago, and the firmware reads 2.05,  no idea if that's actually from Welectron, but I ordered it directly from EEVBlog shop online.  Delivered to UK by DHL courier and it originated from Australia.

Correct, all my units in stock are the latest 2.05. Welectron were just the first to get it.