Old Printer Posted April 10, 2018 Share Posted April 10, 2018 Has anyone heard of an attempt to add coupling switches to the BNC board on the Analog Discovery? It would be nice to be able to change the AC-DC coupling without fiddling with those little blue jumper blocks. Thanks, Dave Link to comment Share on other sites More sharing options...
attila Posted April 10, 2018 Share Posted April 10, 2018 Hi @Old Printer In case you need it, the jumpers specs on the Analog Discovery BNC Adapter board are: 100mil spaced, 42mil holes Link to comment Share on other sites More sharing options...
Piotr Rzeszut Posted April 11, 2018 Share Posted April 11, 2018 I have been thinking of making additional board, which would fit existing jumpers and incorporate switches - the question is how it would affect bandwidth and parasitic parameters of the signal path. Link to comment Share on other sites More sharing options...
Old Printer Posted April 13, 2018 Author Share Posted April 13, 2018 My goal is to add switch functionality to the AC-DC coupling option on the BNC adapter board. I have made the switch mounting plate and fitted the two SPDT switches. I have attached a couple pictures to illustrate what I am doing. Next will be the wiring, which should be pretty straight forward. If all goes well I may do the same thing to the AWG side that would allow changing the impedance options in a similar way. I run the production department for a sign company and have a variety of neat tools at my disposal. The CO2 laser made short work of the mounting plates and markings. Link to comment Share on other sites More sharing options...
attila Posted April 13, 2018 Share Posted April 13, 2018 Hi @Old Printer, @Piotr Rzeszut The mod looks good After adding the switch you might need to slightly adjust the scope probe trimmers for 10x. Before this, you could also verify the 1x input and eventually calibrate 1+ and 2+ inputs, using the 2nd and 3rd trimmers in the device. Link to comment Share on other sites More sharing options...
Old Printer Posted April 13, 2018 Author Share Posted April 13, 2018 Thanks Attila, I imagine the switches and wiring will add a bit of capacitance/inductance. I adjust the probes pretty much every time I use them, as they are used on my analog Tek's as well. Do you have any thoughts on a wiring method that will minimize the change? I really don't do anything demanding great accuracy anyway. Dave Link to comment Share on other sites More sharing options...
attila Posted April 13, 2018 Share Posted April 13, 2018 Hi @kojak I don't think it will influence the measurements to much, since the wiring will be short. Link to comment Share on other sites More sharing options...
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Old Printer
Has anyone heard of an attempt to add coupling switches to the BNC board on the Analog Discovery? It would be nice to be able to change the AC-DC coupling without fiddling with those little blue jumper blocks. Thanks, Dave
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