Simultaneous digital and analog acquisition

[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 possible to acquire at the same time signal from flowmeter1 and flowmeter2 and than download data in .txt?

Every suggestion would be more than appreciated.

Thank you in advance.

Best wishes.

Agostino

[Lamber_86]

Hello Agostino,

for the first flowmeter you have to use a buffered counter input acquisition, with the same sample clock signal used for the second flowmeter (that will be AI sample clock of the cDAQ chassis).

Regarding the synchronization, you can refer to this guide: https://www.ni.com/en/support/documentation/supplemental/21/signal-based-synchronization-of-analog-i...

regards.