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Author Topic: Upgrade a garbage device  (Read 2861 times)

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Offline ssmscTopic starter

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Upgrade a garbage device
« on: May 08, 2023, 02:21:43 pm »
As is well known, Tonghui's TH2690 isplagiarism of keysight B2983，and didn't learn the essence.

https://www.eevblog.com/forum/metrology/plagiarize-keysight-b2983/msg4348219/#msg4348219

Coincidentally, my friend has a Tonghui device with a noise of 10fA without clearing the zero.I have decided to make some simple changes to reduce current noise as low as 1fA.However, even if the noise can be improved, Tonghui has done too poorly in many details, such as the large temperature and voltage coefficients of the feedback resistor.The cable selection at the input end is incorrect….
« Last Edit: May 12, 2023, 03:59:21 am by ssmsc »
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Offline zrq

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Re: Upgrade a garbage device
« Reply #1 on: May 09, 2023, 12:46:51 pm »
I would be curious about what actually caused the higher current noise and what did you modify.
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Offline dhyddr

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Re: Upgrade a garbage device
« Reply #2 on: May 10, 2023, 01:07:13 am »
Nice work :-DD
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