WinUsbTmc - A simple interface for USBTMC based measurement devices 
Friday, July 5, 2013, 22:34 - Measurement devices
Posted by Administrator
In the past every decent measurement device had one of these bulky GPIB connectors to be able to control them with a PC.
This was a very handy feature and powerful automated measurement setups could be easily built.

Nowadays there are many devices on the market with a USB connector. When you intend to make use of this feature, you will notice that you have to download and install a several hundred MB sized library which includes a driver for such devices.
Integrating this library into your own applications can be rather complex depending on your development environment.

Is this really neccesary just to send commands and get a response from your device?

At least I was not happy with this situation.

After doing some research I noticed that these devices implement a certain USB class called USBTMC for which a well described documentation is available.

The communication protocol is very simple and I started to write a small software module with a simple interface to talk to such devices. For this I needed only 2 days of work.
I called it WinUsbTmc and published it as Open source project under GitHub:

The current status of the project consists of the following elements:
- A UsbTmc driver which can be used with all USBTmc measurement devices
- A command line utility to talk to your device from command line or batch file
- A Dll. In case you want to integrate UsbTmc communication in your product this is an easy interface to it

and finally a Matlab interface.

WinUsbTmc follows the KISS principle and everybody should be able to start communicating to his device in the matter within a few minutes.

WinUsbTmc was tested succesfully with 3 devices:
- Rigol 1052E (Scope)
- Rigol DS2072 (Scope)
- Siglent SDG1020 (Function generator)

While developing, it was also interesting to see that some devices don't implement the UsbTmc standard completely. E.g. some class functions which are mandatory according to the UsbTmc specification don't work with some devices.
Nevertheless, I tried to work around it and could use WinUsbTmc already in a automated test setup.

In case you would like to participate: You are welcome.

Adding interfaces for other tools like Matlab would be a nice thing to have, e.g. Labview, Visual C, Borland Delphi, ...

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Current status 
Thursday, December 27, 2012, 23:36 - LCR meter
Posted by Administrator

I promissed to post a short status update of the project... Read More...
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LCR meter - first results 
Monday, November 12, 2012, 23:38 - LCR meter
Posted by Administrator

Here my first update:

Got the analog part up and running.
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Cheap 'n good LCR meter (or RLC meter?) for SMD components 
Tuesday, November 6, 2012, 18:01 - LCR meter
Posted by Administrator
How often do I debug electronic circuits and have a lot of SMD components lying on my table. To avoid mixing up wrong values I usually throw them away.

Sometimes it would be handy to measure the values of SMD components.

Already quite some time ago I found a
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Homemade vortex flow meter 
Monday, November 5, 2012, 22:08 - Vortex Flow meter
Posted by Administrator
I have a selfbuilt ventilation system in my house, including a selfmade heat exchanger.

Of course I'm interesting to measure efficiency of the system, so I added temperature and humidity sensors to it and even realized a function that it only ventilates when the outside humidity is low enough to avoid condensation at cool walls.

But are the in- and outlet ventilators running at the same flowrate?
How big is the pressure drop of the piping and the corresponding reduced flowrate? Read More...
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