Hi, I have an application for a half-bridge readout using an NTC thermistor and precision reference resistor, which will each be 100 kOhm at the nominal operating temperature where this should have maximum sensitivity.
The manual does not mention what the excitation voltage would be with such a half-bridge resistance (>> 700 Ohm). WIll it in fact work, does the excitation voltage go to 2.5 V or so? Is there any problem with such a sensor setup? Will the input impedance of the WebDAQ-904 be >1 GOhm?
I hope someone can provide some quick guidance on this, I need to understand better before investing in this device although I am guessing it should work fine.
I expect I may have to add a low-leakage external capacitor as noise filter for such a circuit, that is simple.
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Gerard
Hi, I have an application for a half-bridge readout using an NTC thermistor and precision reference resistor, which will each be 100 kOhm at the nominal operating temperature where this should have maximum sensitivity.
The manual does not mention what the excitation voltage would be with such a half-bridge resistance (>> 700 Ohm). WIll it in fact work, does the excitation voltage go to 2.5 V or so? Is there any problem with such a sensor setup? Will the input impedance of the WebDAQ-904 be >1 GOhm?
I hope someone can provide some quick guidance on this, I need to understand better before investing in this device although I am guessing it should work fine.
I expect I may have to add a low-leakage external capacitor as noise filter for such a circuit, that is simple.
Thanks, sincerely,
Gerard
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