Products > Test Equipment
My poor mans SMU - The Agilent 66311B
<< < (32/41) > >>
nidlaX:
Does anyone know how to remove the front panel board from the front panel chassis? The service manual suggests I pull the board back 1/8th of an inch near the encoder, but I can't feel any compliance and fear breaking the board if I do so.
feedback.loop:

--- Quote from: nidlaX on June 10, 2016, 06:59:40 pm ---Does anyone know how to remove the front panel board from the front panel chassis? The service manual suggests I pull the board back 1/8th of an inch near the encoder, but I can't feel any compliance and fear breaking the board if I do so.

--- End quote ---

First you need to undo the nut on the encoder, then bend the tab on the board (see the pic) slightly so that it can go past the plastic stop, then you must be able to slide the board a few millimeters from under the hooks.
nidlaX:

--- Quote from: feedback.loop on June 10, 2016, 08:34:35 pm ---
--- Quote from: nidlaX on June 10, 2016, 06:59:40 pm ---Does anyone know how to remove the front panel board from the front panel chassis? The service manual suggests I pull the board back 1/8th of an inch near the encoder, but I can't feel any compliance and fear breaking the board if I do so.

--- End quote ---

First you need to undo the nut on the encoder, then bend the tab on the board (see the pic) slightly so that it can go past the plastic stop, then you must be able to slide the board a few millimeters from under the hooks.

--- End quote ---
Thanks! Not sure how I missed the encoder being secured to the front panel chassis (although it's not mentioned in the disassembly procedure). :palm:
ve7xen:
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
pigrew:
I started trying to learn about Windows Presentation Framework over the weekend. I mostly can do the GUI part now, but data binding is still a mystery. Maybe next week I'll figure that stuff out.

Anyway, the software is able to talk to my 66309D pretty well.

<https://github.com/pigrew/HP663xxCtrl>

I'm not yet posting any builds, as there are a few small issues that need to be fixed (like adding a Save button). But, it's in a somewhat usable state. It'll probably work with any of the 663xx series (but I forgot to tell it about the 66312A and 66332A). If you find issues with its ability to talk to other models, let me know or send me a pull request on GitHub.

I tried to replicate Agilent's "data log" feature, but I'm not able to see most of my advertisement packets, so I'm not sure how useful it would be for me to estimate energy usage. Their software restricted it to the 66319/66321, but I'm not sure why. The user manual didn't describe any commands supported by the newer hardware or firmware v3 that would seem to be required.

The attached is the current draw of a TI BLE microprocessor. I've triggered it on an advertisement packet. It's transmitting on three different channels.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod