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EEVBlog 121GW Discussion thread
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bte:

--- Quote from: EEVblog on March 28, 2024, 05:30:11 am ---
--- Quote from: bte on March 28, 2024, 12:05:41 am ---I don't have the 121GW so I can't answer that part of the question. I purchased a BM235 from Simon for a similar reason: I wanted the package to be sent via regular mail, not DHL/Fedex etc because here they are a pain to deal with (a lot of bureaucracy that includes giving their employees power of attorney and they add a lot of fees --- with post office, no power of attorney is needed and only the customs tax need to be paid, which happens at the time of delivery).
--- End quote ---

I also have a local postage shipping option. Goes via Sendle in Australia, but then I believe is handed to your local postage service.

--- End quote ---

Well, this was my experience from three years ago. To check what is available now, I tried to order BM235 from eevblog.store site. It looks like Turkey is not available as a destination anymore (see attached picture --- I also tried with my actual information but it did not make a difference). Maybe Turkey is beyond Zone 5. It would help to know on the checkout page if this was the case.

PS: I know that a lot of retailers no longer ship to Turkey if the item value is over 150 Euros (two years ago, the law was changed and personal import allowance was reduced from 1500 EUR to 150 EUR), but it should not be the case here since BM235 shows up as $113 in the cart.
thm_w:
It would be nice if Shopify could just remove the country from the list to make it obvious that they won't accept shipments there.

If you want to be a dick you can order via Ebay, where Dave has not restricted it yet. But I would not do that lol
https://www.ebay.com/itm/223244201244
"Excludes:
Afghanistan, Anguilla, Belarus, Bolivia, Botswana, Central African Republic, Chad, Comoros, Djibouti, Ecuador, El Salvador, Guinea-Bissau, Guyana, Libya, Madagascar, Moldova, Mongolia, North Korea, Reunion, Russian Federation, Rwanda, Sierra Leone, Somalia, Suriname, Svalbard and Jan Mayen, Syria, Trinidad and Tobago, Tunisia, Venezuela, Yemen"

Cost for me is about $37 to ship to Jordan via UPS. DHL is $68. But customs can be hell even if shipping cost is reasonable.
hlj.pycad:
Hi, I have viewed quite some videos on this DMM and now I am ponderig for it's considerable slow speed against its so many features.
And I also do a little search for other DMM using the same hy3131: Holdpeak HP-770D, UNI-T 171 series, 121GW, AmazonCommercial 90DM860 .. Among thoes name mentioned above, UNI-T 171 series is smoking fast, while the other can place them to "Slow category".

One idea comes up to my mind. Hycon's popular DM0660 is kind of slowly too, but it can double its' speed by changing the 4 Mhz Crystal oscillator to 8Mhz when most of the function keep working1 . I wonder does this overclocking hack work for HY3131 too. If it is possible, one should change the oscillator of the hy3131 or the MCU, or both of them?

Again, it's amazing how different the speed is comparing UNI-t 171 to 121GW. I would like to have 121GW if I can hack it become faster.



Note:
1. 8Mhz DM0660's voltage, current & temp will work without any modification. Resistor and Capacity will need to tweak the eeprom, easy enough though. Frequency will show result by half, 60Hz will show 30Hz, only function that will "break", but I don't mind for the trade off speed.
thm_w:

--- Quote from: hlj.pycad on April 28, 2024, 05:08:43 pm ---Note:
1. 8Mhz DM0660's voltage, current & temp will work without any modification. Resistor and Capacity will need to tweak the eeprom, easy enough though. Frequency will show result by half, 60Hz will show 30Hz, only function that will "break", but I don't mind for the trade off speed.

--- End quote ---

The HY inside is running at 4.9152MHz, which could be increased to 8MHz. Though I don't know what other issues you might run in to: https://github.com/tpwrules/121gw-re/blob/master/pdfs/121GW%20EEVBlog%20Circuit%20diagram.pdf

The firmware was never open-sourced, so if you run into incorrect/doubled readings there is no easy way to correct them.
petl:
I have just tried to install the 121GW android app, but it seems to have diappeared from the android store: https://play.google.com/store/apps/details?id=kr.co.finest.eevblog&hl=enication

Any ideas on to why?
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