Simultaneous digital and analog acquisition (cDAQ-9174)

[aghetti]

Hi all,

I have two flow meters in series and I have to acquire flow rate data from each, simultaneously.

--FLOW METER 1: hall-effect flowmeter (see attachment). Its output are DC square waves (digital output) whose frequency is proportional to flow rate.

In order to acquire from this meter, I have a NI-9411 card.

In SignalExpress I did: Acquire Signal >> DAQmx Acquire >> Counter Input >> Frequency

--FLOW METER2: electromagnetic flowmeter (TOSHIBA, see attachment) model GF630/LF620, whose output is an analog signal, whose voltage is proportional to flow rate.

In order to acquire from this meter, I have a NI-9203 card.

In SignalExpress I did: Acquire Signal >> DAQmx Acquire >> Analog Input >> Voltage

Both the cards are in a NI cDAQ-9174 chassis.

My question is: Is it possbile to acquire signals simultaneously from flowmeter1 and flowmeter2 and than download data in .txt?

Every suggestion would be more than appreciated.

Thank you in advance.

Best wishes

Agostino Ghetti

[Lamber_86]

Hi Agostino,

you can synchronize the two acquisitions.

For the first flowmeter you need a buffered counter input with the same sample rate of the AI acquisition (that will be AI sample clock).

Refer to the following guide for the synchronizations metodology: https://www.ni.com/en/support/documentation/supplemental/21/signal-based-synchronization-of-analog-i...