| Products > Test Equipment |
| My poor mans SMU - The Agilent 66311B |
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| samofab:
yea, it works now. found another bug.. if you try to acquire much more than 3000 points the read operation timeouts at ReadIEEEBlock |
| nctnico:
@pigrew: your software looks interesting. When I have some time I'll try it. |
| pigrew:
I've put the software on the back-burner for the last few weeks. I ended up buying a similar Keithley supply (2304A), and will write a driver to also control that instrument with the same software. In the mean time, I'm fixing a few minor bugs I've found. I also found that there is a native .Net driver interface for visa (ivi.net). I had been using IVI VISA COM. It looks like IVI VISA.Net has been supported for the last year or so, and makes it much more clear how to write drivers that don't have memory leaks and other issues. So, unless there are objections, I'll transition to using Ivi.net. It looks like it is supported on all recent versions of Windows (NI Visa 15+, Keysight IO 17.2+). I promise to post a build of the software in the next week, once known issues are fixed and Keithley support is added. Since it'll support other instruments, I'll make a new thread for the software (and post a link here). |
| kaz911:
--- Quote from: ve7xen on July 06, 2016, 04:10:03 am ---I decided that not having a knob was unacceptable, and have been wanting to try having small parts printed by a 3D printing house, so figured modelling and having a knob printed would be a good exercise. Based on the photos here and at the Agilent Find-A-Part, plus some measurements of my actual unit, I did my best at a model in OnShape (shown is not exactly what was printed, I made some refinements): I had the design printed by Sculpteo, using their SLS process, in 'polished beige plastic'. With express shipping it cost about $15 and arrived in a week. Overall I am happy with the result. The only flaw was that the printing process left about 0.1mm extra clearance around the knob shaft. I had expected 'expansion' and not 'shrinkage' so had modeled to exactly the shaft dimensions, so now it's a bit sloppy. The STL I exported was also somewhat 'low res', resulting in the stepped appearance. I have changed the model to make the knob about 1mm taller, since it seems a bit shorter than the real one, added 0.1mm total interference on the shaft dimensions to make it tighter, and exported at a higher fidelity. I don't intend to reprint, as I think what I've got will be perfectly functional. I have made the model public on OnShape, so you can copy it to your own workspace and modify as you see fit: https://cad.onshape.com/documents/2770017399f21096171bcc75/w/82d82831cbaa64cec2e5b5a7/e/d79452ab36c21b057637b9b5 You can also download an STL file for direct printing here (note this is a refined model that I have not myself printed): http://gotroot.ca/media/agilent_knob_model.stl --- End quote --- Hmm - I think Keysight spares quotes about $3.86 for the dial :) when you look for spares using the part number. I got 66311b from Ian for GBP 40,- without Dial knob - so I looked it up. But I then remembered i had an old E3610 panel in the scrap pile - and that has the same dial/knob so I solved it. But nice work making one - I'll try and print it on my Zortrax next time I turn it on to see how it does on ABS. The 66311b I got from Ian was non functional - and it was a 120v unit - someone had probably plugged into 230/240 V uk supply. 1 main fuse and one onboard through hole 5A fuse later - the thing is now spinning but noisy as h.. :) But very precise and works well. |
| HighVoltage:
--- Quote from: kaz911 on November 09, 2016, 11:45:45 pm ---- the thing is now spinning but noisy as h.. :) But very precise and works well. --- End quote --- If you add a 100 Ohm resistor in line with the fan supply, it gets much quieter and still has plenty of air flow. Or you use an ultra quiet fan with built in temperature control. I have two of these and they are both very quiet now. |
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