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How to measure 12V input frequency signal on AI pins of USB-6009

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Ma
ximum voltage that can be connected to analog
inputs is from -20 V to 20 V (card specifications
Ma
ximum voltage that can be connected to analog
inputs is from -20 V to 20 V (card specifications
Ma
ximum voltage that can be connected to analog
inputs is from -20 V to 20 V (card specifications

Maximum signal that can be measure in 6009 AI Analog Input pins is -10 V to 10 V as per spec. I want to measure a 12V freq signal 0.1Hz to 2000Hz with 50% DC. Do I have to scale it down to 5V or can directly connect to 6009 AI pins. If need to scale down what are my options. My signal is pulled up to 3.3K+100Ohm resistance.

 

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