Author Topic: Zeeweii DSO1C81  (Read 3973 times)

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Online tunk

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Re: Zeeweii DSO1C81
« Reply #25 on: November 01, 2024, 05:54:01 pm »
A short promotional video from Zeeweii: https://youtu.be/zUbpIGRi078
 
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Online Aldo22Topic starter

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Re: Zeeweii DSO1C81
« Reply #26 on: November 22, 2024, 09:09:49 am »
Almost ridiculously cheap now on AE.
https://www.aliexpress.com/item/1005007394192248.html
Shipping, P6100 probe, battery,.. included.
Zeeweii produces reasonably mature devices for the lowest price segment.
« Last Edit: November 22, 2024, 09:15:53 am by Aldo22 »
 

Offline IC_Toaster

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Re: Zeeweii DSO1C81
« Reply #27 on: November 27, 2024, 03:52:19 pm »
A short promotional video from Zeeweii: https://youtu.be/zUbpIGRi078

There is a cursor on FFT mode to see the frequency of the peaks. This makes the FFT mode more useful than the FFT mode of many other devices.
 
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Offline jeffs555

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Re: Zeeweii DSO1C81
« Reply #28 on: December 09, 2024, 10:01:17 pm »
Have always had a good bench scope, and never really felt the need for a handheld. However, saw this on cyber Monday sale for $33 with free shipping and couldn't resist. It arrived today and overall I am very pleased with it. I have fed it signals up to 100MHz from a tinySA and it syncs to all of them, but it does get a little jittery above 50MHz.

The main problem I see with the unit I received is that the compensation on the input divider seems to be way off. At 1MHz, going from 500mV/div to 200mV/div to 100mV/div the display scales correctly. However at higher input frequencies, the scaling gets worse and worse. With 75MHz signal, going from 200mV/div to 100mV/div, the displayed waveform actually shrinks. Don't know if I will try to get it replaced or try to fix it. From the internal photos posted, appears to be a trim cap for internal compensation, so will probably try adjusting that first.

 
 

Offline jeffs555

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Re: Zeeweii DSO1C81
« Reply #29 on: December 10, 2024, 06:28:15 am »
I have done some more testing, and the bandwidth problem I am seeing is only on the most sensitive vertical setting.With a 10x probe at 200mV/div or above, everything is fine and bandwidth seems to be at least 100MHz. However, on mine with a 10x probe at 100mV/div the bandwidth is crap. A 30MHz sine wave shows only half of its actual value, and a 60MHz sine is around 1/3 of its actual value.

Hopefully, someone else has one and can let me know if this is just the way DSO1C81s work or if it is a build problem with my unit. 
 

Online Aldo22Topic starter

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Re: Zeeweii DSO1C81
« Reply #30 on: December 10, 2024, 06:20:06 pm »
I don't have a DSO1C81, but a DSO2512G.
I don't think that's the way it should be.
Is the bandwidth limitation off?
Probe really at 10x?
 
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Offline jeffs555

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Re: Zeeweii DSO1C81
« Reply #31 on: December 10, 2024, 08:32:48 pm »
Thanks for responding.

You are right that it acts just like the 20MHz limit is turned on, but I am sure it is off. When I turn the 20MHz limit on, all the voltage settings act like the 100mV setting and a 30MHz sine shows half of the actual voltage. It is like the the 100mV setting always has the 20MHz limit even when the limit is turned off.

Will try contacting Zeeweii and see what they say.

« Last Edit: December 10, 2024, 08:41:34 pm by jeffs555 »
 


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