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Hantek1833 can not power on

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Post time 2021-1-8 15:10:03 | Show all posts |Read mode
Edited by ying at 2021-1-8 15:19

Customer Consulation

I bought your new Hantek LCR 1833C from Banggood.

It is a great meter, provides unique resolution, features and is the best in its price class x2.

I am using your meter for an industrial project and it failed after 11 days of use in a weird way that could be a software lockup or a usb-serial chip failure.
I am an EE with 50 years of embedded experience and regularly uses 32bit ARM chips so I know the symptoms.

During the 11 days of use I made around 1000 measurements turning the meter on for 20S and then off to prevent test device heating.
It never had an issue. However, after I setup the software for a PC interface and got it working with it all the normal keysight connection messages it stopped working after I shut it off. A meter failure after 1st use of the USB-PC software is rather odd. Btw, I used the new driver code for the ARM SN of 20201010 so that is correct.

I was testing the interface measuring a 285uh, 2.89 Q choke at 100khz for around 20 minutes checking every 5 minutes. attached is the photo of the working meter.The 1st anomaly I noticed while plugged into the PC is that the handset display went dark but the system continued to work normally. After I shut down the PC software and disconnected the USB, the meter never re-started. I tried plugging it in the USB was now not recognized preventing any access. I tried removing the batteries for a minute to see if I could create reset re-start but it had no effect. If you want I can do added testing to help define this issue for you.

However, I need another meter asap for my project. Banggood, Ali and Amazon show a 14 day lead time and then shipping times of a week or 2.
Which distributor has stock that I can buy immediately? Can you sell me one directly? I can supply a visa for payment.

Thanks for your help.



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Use magic Report

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 Author| Post time 2021-1-8 15:12:53 | Show all posts
Edited by ying at 2021-1-8 15:20

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If it is convenient, you could try to measure the IC and components as the below figures.










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 Author| Post time 2021-1-8 15:17:17 | Show all posts
Edited by ying at 2021-1-8 15:18

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 Author| Post time 2021-1-14 11:59:23 | Show all posts

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Please try to exchange the components D9 and U13 and U102.
If it is convenient, please add a 5K,0603 resistance like this.





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 Author| Post time 2021-1-14 13:30:20 | Show all posts
ying replied at 2021-1-14 11:59
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Please try to exchange the components D9 and U13 and U102.

Customer reply

I was not able to get the SGM2019-3.3 in the USA. However, I crossed to a TPS73633DBVRG4  that is a 3.3Vdc RF LDO? in a SOT23-5 package with the same pinout.

https://www.digikey.com/en/products/detail/texas-instruments/TPS73633MDBVREP/1219940

This part is rated for 400ma so it has added current capacity and can work with a minimal output bypass capacitor. Parts are ordered and I should have them Friday.

The meter failure occurred when I ran it for around an hour with the USB link. Do you think this is an LDO overheat issue? What is the function of the 1n4148WS?



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 Author| Post time 2021-1-14 13:31:18 | Show all posts
ying replied at 2021-1-14 13:30
Customer reply

I was not able to get the SGM2019-3.3 in the USA. However, I crossed to a TPS73633 ...

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Yes. You can use TPS73633DBVRG4.

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 Author| Post time 2021-1-14 13:32:16 | Show all posts
ying replied at 2021-1-14 13:31
Reply

Yes. You can use TPS73633DBVRG4.

Customer Reply

I replaced the 2x LDOs, The diode, and added the 5k per your photo.
With these changes, the meter is back operational and seems to work normally.

Thank you for your help. Without the Hantek meter, the project was held up.
Please let me know if you want me to run any tests for you on the repaired meter.

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 Author| Post time 2021-1-14 13:34:03 | Show all posts
Edited by ying at 2021-1-14 13:35
ying replied at 2021-1-14 13:32
Customer Reply

I replaced the 2x LDOs, The diode, and added the 5k per your photo.

Reply

Good news. You can use it normally and there is no need to do other test.

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