basic question concerning CNiDAQmxAIChannels::CreateFrequencyVoltageChannel

[sscooter1010]

Given a TTL signal connected to an analog input on a multi-function DAQ board (6015), would CNiDAQmxAIChannels::CreateFrequencyVoltageChannel() convert the TTL into a voltage that I could read? Or does the TTL have to converted to a voltage before it gets to the DAQ Pad?

Scott

[Marni]

Dear Scott,

A TTL signal is just a signal that has a low (0V - .8V) and a high (2V - 5V). A typical TTL signal is 0V for a period of time and 5V for a period of time, repeating. Since the signal is already a voltage, it doesn't have to be converted. The DAQPad 6015 isn't designed for frequency measurements, so I would bring in the TTL signal as a counter using CNiDAQmxCIChannel::CreateFrequencyChannel or use CNiDAQmxAIChannel::CreateVoltageChannel() to bring the signal in as an analog voltage and find the frequency in software. What software are you using with Measurement Studio? Please let me know if you have any questions. Have a great day!

Sincerely,

Marni S.