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Messages - pcooper

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Electronics / DAQ power supply recommendation
« on: May 03, 2019, 03:55:03 PM »
Sharing a recommendation to solve a signal noise issue created by most cheap power adapters.

If you're using the 42AWG coax cable from the master parts list and your line is much more than 3 feet long, you'll probably need a power adapter to run the scope reliably. Most AC/DC adapters use a cheap switch-mode converter with minimal filtering to produce the DC voltage. Any noise from the power supply will be coupled into your miniscope communication signal.

I noticed the issue on my oscilloscope while trying to troubleshoot random connection failures and sudden red screens. The 1-2MHz scope signal looked relatively clean, but there was a saw tooth pattern around 100kHz when the power supply was plugged in.

This power supply is designed to eliminate noise. Comes with an adapter that fits the DAQ, as well as international power adapters. The 9V model is practically noise-free and has no observable impact on the scope's communication signal when plugged in.

While the intermittent nature of the errors makes it hard to determine if this has made a significant difference, it certainly eliminates a variable. So far it seems to have improved stability. We have purchased one per DAQ for our lab. I recommend considering the same if you're using long cables and experiencing connection issues. Make sure to get the 9V model.

DAQ Software/Firmware / Re: Error recognizing USB. Install failed.
« on: March 28, 2018, 07:51:38 PM »
Hi Daniel,

Thanks for taking the time to reply.

I've tried it with 2 seperate USB 3.0 cables, one USB 2 cable, and 3 seperate computers (Win10, Win7, unsure of MacOS version). Each computer is a single OS only. All computers and cables work normally with any other task and equipment.

The soldering concern was only with the 2 pins on either side of the chip that don't have any noticable solder fillet. The other 10 look as good as a lead-free reflow can.

I've since reached out to LabMaker. They claim to have pre-installed the firmware. Working with them to further troubleshoot now.

Is there something I don't know about USB 3.0 that would allow the cables to work perfectly with an external HDD but not with this? Both cables tested are 1m long or shorter. I'll try more if you think it's worth the time, but I'm having a hard time understanding what difference could be made.

DAQ Software/Firmware / Error recognizing USB. Install failed.
« on: March 26, 2018, 07:37:31 PM »

I cannot get my DAQ to be recognized by my computer to begin the firmware install.

I have a "MINISCOPE USB_Control v2.3" board. Came with all through hole components and EEPROM installed from LabMaker.

When plugged in with a known good USB 3 cable, it either acts as if nothing has been plugged in (Win7, Mac) or gives a hardware error (Win10). Win10 error screen shot attached.

I have double checked all switch settings per the setup guide.
Jumpers are in K1, K2, and J9-USB.
I have swapped out the EEPROM with no difference in results.

I'm hoping there may be something I'm missing. I'm starting to worry I got a bad board. Some of the solder joints look a little starved. (U6 especially. pics attached).

Any thoughts on what I could be doing wrong? If not, any insight on how good LabMaker is about replacements?


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