PicoScope 7 Software
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Datalogging 8 Channel
Datalogging 8 Channel
Good afternoon all,
I am looking for some advice.
I have bought a PICOLog 1216 to capture 8 pressure sensors at the same time. I have built a box and mounted all inside the box using terminal blocks to split 24v supply to each sensor and ground. The sensors have a shielding but to connect between the terminal block to the PICOLog I have just 0.22mm wire with crimp ends.
I'm getting a little bouncing of values with a single sensor activated ~0.1mmHg but would like to improve the shielding. Do you think grounding the sensor would improve the reading or shielding the unshielded wire? Would tin foil suffice to prevent EMC?
Any help greatly apprecia ted!
I am looking for some advice.
I have bought a PICOLog 1216 to capture 8 pressure sensors at the same time. I have built a box and mounted all inside the box using terminal blocks to split 24v supply to each sensor and ground. The sensors have a shielding but to connect between the terminal block to the PICOLog I have just 0.22mm wire with crimp ends.
I'm getting a little bouncing of values with a single sensor activated ~0.1mmHg but would like to improve the shielding. Do you think grounding the sensor would improve the reading or shielding the unshielded wire? Would tin foil suffice to prevent EMC?
Any help greatly apprecia ted!
Re: Datalogging 8 Channel
Hi Woster,
I'm a bit unclear about your description. You say that you have split the 24V supply to each sensor and ground, but then you ask if grounding the sensor would improve the reading?
Shielding the signal wire that goes to the terminal board, or better still replacing it with shielded cable, should help prevent crosstalk (which is what I assume you mean by bouncing values) and you should only need to connect the shield at the sensor end.
Tin foil, if applied to the box correctly, would help reduce emissions and interference.
Regards,
Gerry
I'm a bit unclear about your description. You say that you have split the 24V supply to each sensor and ground, but then you ask if grounding the sensor would improve the reading?
Shielding the signal wire that goes to the terminal board, or better still replacing it with shielded cable, should help prevent crosstalk (which is what I assume you mean by bouncing values) and you should only need to connect the shield at the sensor end.
Tin foil, if applied to the box correctly, would help reduce emissions and interference.
Regards,
Gerry
Gerry
Technical Specialist
Technical Specialist
Re: Datalogging 8 Channel
Hi gerry,
Thanks for the reply. Apologies that i havent explained very well.
I havent shielded the sensors - only grounded. I havent got a shielding wire for the pressure sensor reading cable, and have only used a 0.22mm wire. The values i am getting are jumping around a little bit, which i assume is EMC interference. This isnt a problem when I am logging over a longer period of time, but for shorter sampling rates, these bounces are too much. As i've connected to a terminal block, i wonder if there is interference between these blocks (the output voltage is between a 24v and ground terminal block).
Thanks for the help
Thanks for the reply. Apologies that i havent explained very well.
I havent shielded the sensors - only grounded. I havent got a shielding wire for the pressure sensor reading cable, and have only used a 0.22mm wire. The values i am getting are jumping around a little bit, which i assume is EMC interference. This isnt a problem when I am logging over a longer period of time, but for shorter sampling rates, these bounces are too much. As i've connected to a terminal block, i wonder if there is interference between these blocks (the output voltage is between a 24v and ground terminal block).
Thanks for the help
Re: Datalogging 8 Channel
Hi Wooster,
As I mentioned, just getting some shielded, single core cable, should solve the problem.
However, just so that we are on the same page, could you post Picolog data files showing the 'bouncing' you mentioned, at different sample rates, and also post an image (or images) of your setup.
Regards,
Gerry
As I mentioned, just getting some shielded, single core cable, should solve the problem.
However, just so that we are on the same page, could you post Picolog data files showing the 'bouncing' you mentioned, at different sample rates, and also post an image (or images) of your setup.
Regards,
Gerry
Gerry
Technical Specialist
Technical Specialist
Re: Datalogging 8 Channel
Hi Gerry,Gerry wrote: ↑Mon Sep 28, 2020 4:28 pmHi Wooster,
As I mentioned, just getting some shielded, single core cable, should solve the problem.
However, just so that we are on the same page, could you post Picolog data files showing the 'bouncing' you mentioned, at different sample rates, and also post an image (or images) of your setup.
Regards,
Gerry
I will get some files sorted in the next week and post back.
Many thanks