H_M Posted October 23, 2022 Share Posted October 23, 2022 Hello all, First time for me to ask in this forum. I was just wondering, is there any recomneded multiplexer that I can connetct to the impedance analyser board of the digilent discovery 2 which will enable me to take multi frequency impedance measurments for more the one DUT? Cheers Link to comment Share on other sites More sharing options...
0 JColvin Posted October 24, 2022 Share Posted October 24, 2022 Hi @H_M, There is not any particular recommended multiplexer that would do as you are describing. Mechanical switches that let you route a single source to one of multiple options certainly exist, though I do not have a recommendation of one that would avoid adding any additional impedance to the system. Also since the Impedance Analyzer board uses a terminal block to latch onto whatever wires from the DUT, there will inevitably be some degree of (at least visually) jerry-rigging the setup. Thanks, JColvin H_M 1 Link to comment Share on other sites More sharing options...
0 attila Posted October 27, 2022 Share Posted October 27, 2022 Hi @H_M The newer software versions let you use the free DIO lines for custom purpose, like to control relays or analog switches. Link to comment Share on other sites More sharing options...
0 H_M Posted October 31, 2022 Author Share Posted October 31, 2022 (edited) Hello @JColvin and @attila thanks for your responses. Actually I came across this multiplexer and thinking to connect it to the two terminals of the impedance analyser. https://shop.pimoroni.com/products/sparkfun-analog-digital-mux-breakout-cd74hc4067?variant=7544220801 Any suggestion on this. Many thanks again to your replies. Best wishes H_M Edited October 31, 2022 by H_M Link to comment Share on other sites More sharing options...
0 attila Posted October 31, 2022 Share Posted October 31, 2022 Hi @H_M If you are using such makes sure to set proper offset to have positive signal. The 60-270 Ohm switch resistance and capacitance may affect the measurements but the open/short compensation should correct this. H_M 1 Link to comment Share on other sites More sharing options...
0 H_M Posted October 31, 2022 Author Share Posted October 31, 2022 Hello @attila thanks again for your response. I am just wondering what does 60-270 Ohm? is it for the multiplexer or from the impedance analyser spesifications? And if you can give a recomendation for a multiplexer type which does not need offset when used with the impedance analyser. Best wishes H_M Link to comment Share on other sites More sharing options...
0 attila Posted October 31, 2022 Share Posted October 31, 2022 (edited) Hi @H_M I saw the 60-270 Ohms in the CD74HC4067 sheet. I'm not an EE but from experience the relays are the best for such purpose. The analog switches have lower consumption and are more reliable but have horizontal/vertical ( bw/voltage) limitations. Edit: Feel free to correct me if I'm wrong. Edited October 31, 2022 by attila H_M 1 Link to comment Share on other sites More sharing options...
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H_M
Hello all,
First time for me to ask in this forum.
I was just wondering, is there any recomneded multiplexer that I can connetct to the impedance analyser board of the digilent discovery 2 which will enable me to take multi frequency impedance measurments for more the one DUT?
Cheers
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