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USB-1608FS Onboard 5Vdc termination to Analog Input Wiring - Load Resistor?



Hi All, we are using the USB-1608FS with the AzeoTech DAQFactory software. we have need for fast scanning to detect when continuity is dropped for a 5Vdc input to one of the analogue inputs. We are drawing from the 5Vdc output on the digital side of the IO. Running that through a N/C relay and terminating that to the CH7 in on the analogue side. However, when we switch N/O, the decay / lag in voltage drop is not dropping fast enough to catch the event. the switch time is very short. What is the recommended load resistor to use? 

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