When measuring voltage with analog input ACH0 and ACH1 using USB-2627 and DAQami, the measured voltage will not match the actual voltage.
Is it possible to change the input impedance of analog input on DAQami?
If possible, could you please tell me the command? Or can I do that using UL and InstaCal?
I think this phenomenon is caused by installing voltage dividing resistors of 300kΩ and 100kΩ to reduce the voltage to a quarter before inputting it. By inputting 1V into this, I can see the following:
Voltage at the connector end of the channel containing the voltage dividing resistor: Measured about 0.7V
Measure voltage of channel without voltage dividing resistor: 1V
From this phenomenon, I inferred that the input impedance of the analog input port was low.
Question
Fukuda
When measuring voltage with analog input ACH0 and ACH1 using USB-2627 and DAQami, the measured voltage will not match the actual voltage.
Is it possible to change the input impedance of analog input on DAQami?
If possible, could you please tell me the command? Or can I do that using UL and InstaCal?
I think this phenomenon is caused by installing voltage dividing resistors of 300kΩ and 100kΩ to reduce the voltage to a quarter before inputting it. By inputting 1V into this, I can see the following:
From this phenomenon, I inferred that the input impedance of the analog input port was low.
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