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DSO Quad is a pocket size 4 channel digital oscilloscope for common electronic engineering tasks. It's based on ARM cortex M3 (STM32F103VCT6) 32 bits platform, providing 72MS/s sampling rate with integrated FPGA and high speed ADC. Internal 2MB USB disk could be used to store waveform, user application and upgrade firmware.
Feature
Pocket size and light weight
Two 72MS/s analog channels, plus two digital channels
Signal Generator
Auto Measurement
Various Triggering Option
Easy waveform storage
Firmware upgrade
User applications
Open source
Specifications
Analog channel * 2 : [CH_A] [CH_B];
Digital channel * 2 : [CH_C] [CH_D];
Vertical Scale: 20mV-10V/div (x1 probe);
Vertical solution: 8 bit ;
Input coupling: AC/DC ;
Max input voltage: 80Vpp (x1 probe);
Storage: 4K per channel
Software trigger type: edge, pulse, level (to be added)
Display refreshes extremely slow at low frequency settings
The refreshing of the display is very slow (upto more than 2 minutes to get a new image) at settings above 1mS upto 1S sweeptime. I think this is the same issue discribed in the question: "Lag at Low Frequency" from Aswith. Please let us know wether it is possible to change the settings in order to refresh the display more often. Thanks for your help.
Dear Deray, Thank you for your help. The SCAN mode I can find, but the MEMORY DEPTH adjustment I cannot find on the device or in the manual. Can you please tell me how to change the memory depth?
Thank You
Answered by Familie van der lelie |
2013-03-02
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Hi Familie, according to my seraching, for the new ver1.0 above firmware, it have solve this problem. What you need to use SCAN mode and select the Memory depth(360-4K) to minimum 360.
Answered by Deray Wu |
2013-01-21
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Thank you Deray. Do you know if anyone is working on an improving update for this software defect?
Answered by Familie |
2013-01-21
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Sorry for the incorrect answer, please selcect the measuring model of SCAN.
I see a big lag (in the order of 40+ seconds) while trying to view low frequency signals (a few hundred hertz). Is there something I could be doing wrong?
Select the measuring model of SCAN , it will be work.
Answered by Deray Wu |
2013-01-18
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This is a problem for me as well, see my question: Display refreshes extremely slow at low frequency settings, thanks for any help.
Answered by Familie |
2013-01-13
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Ok here's is how I discovered this issue. I wanted to show someone the step response of an RC circuit. The time constant of the circuit was quite low - about 250ms or 500ms I think. When I sent in a step input, I saw no output on the scope - I reduced the time scale to 200ms, 500ms and 1ms but still didn't see anything.
So next, I set the time scale to 500ms and waited. I did see the decaying exponential output, but after waiting for a long time. It took about a minute for the decaying exponential to appear on the screen.
What I gather from this is it looks like the DSO quad samples even the low frequency signals at 72MS/S. Could this be the reason for the lag? If that is the case it might be a could idea to dynamically change the sampling rate depending on the time scale chosen.
Answered by Ashwith Rego |
2013-01-04
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Sorry ,we do not quite understand it, could you give us more details for your issue?
I've recently received my DSO Quad and I played around with it trying various signal sources and I love it !
I also solved the main problem I bought it for and it's great :)
Battery came with inversed polarity, but I was aware that this might happen from reading the forum and I quickly cut the wires and soldered them back properly.
I initially wanted the aluminium case version but those weren't in stock, and I needed one urgently so I got this one and it's fine.
It's quite a nice gadget
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Andrey Pozhogin | 2012-02-10
I was so much excited to get this tool (had a great experience with Nano). However the more I use it the more it proves to be just an expencive toy. The problem is the triggering is not reliable (I would call it non-working). There are bunch of people on the forum moaning because of the same problem. I can't see SPI on it, it misses UART, it misses square modulated impulses that motherboard issues when PC starts. What can be easier than to catch a PWM signal? And the worst thing is that lasts and lasts and nobody from seeed is there in Tech Support section to address the issue.
If you are reading it when 22 century on your calendar - check for firmware updates. They may have well fixed that 50 years ago. A I write this I have versions 1,51 and 2,52 flashed. I believe (ok, I hope!) that's not hardware issue.
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Srdjan Petrovic | 2011-12-01
package was delivered in 10 days
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S****C | 2011-11-21
whether it has metal casing
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Eric Gionet | 2011-11-16
Hi,
I ordered two units from their first production run. After a long wait I finally received them but the battery was dead in one of them. Sent several emails for a replacement battery, was told one was on the way, well its been over 6 months and no battery has arrived.
Order from Seedstudio at your own risk!
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Pavel Zakharov | 2011-10-22
Excellent product for the price!
It took around 3 weeks to arrive to Canada (expect 1-2 weeks for shipping).
Note: This is a beta release, so there are some minor issues and the documentation could be improved a bit about the different functions, but if you are moderately experienced with oscilloscopes, that shouldn't be a problem. I haven't seen any disrupting bugs yet.
Pros:
- The graphics are very nice and all the advertised features are there.
- Really small and light, analog probes have a professional feel.
- Save feature is quite useful
Could be improved:
- Digital probes don't fit well in the slots (I am using analog ones instead)
- Navigation buttons are hard to press / takes time to get used to.
- Interface navigation could be improved.
Bottom line: I am very satisfied with the product, but it might be somewhat tricky for beginners.
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Deray Wu
