acquire data from multiple channels using an mcc device -凯发k8网页登录

this example uses:

data acquisition toolbox

this example shows how to acquire data from multiple analog input channels with an mcc device.

hardware setup

this example uses a measurement computing usb-1608fs-plus device to log data from analog input channels 0 and 9, which are connected to the outputs of a function generator.

display a list of available devices

discover devices connected to your system using daqlist.

d = daqlist("mcc")

d =
  1×4 table
    deviceid                     description                           model                 deviceinfo       
    ________    _____________________________________________    _________________    ________________________
    "board0"    "measurement computing corp. usb-1608fs-plus"    "usb-1608fs-plus"    [1×1 daq.sdk.deviceinfo]

get details about a device

the daqlist function shows you the overview of devices available. you can find additional device details by reviewing the deviceinfo field of the table.

deviceinfo = d{1, "deviceinfo"}

deviceinfo = 
mcc: measurement computing corp. usb-1608fs-plus (device id: 'board0')
   analog input supports:
      4 ranges supported
      rates from 0.1 to 100000.0 scans/sec
      8 channels ('ai0' - 'ai7')
      'voltage' measurement type

create a dataacquisition and add input channels

the daq function creates a dataacquisition object. the dataacquisition contains information describing hardware, scan rate, and other properties associated with the acquisition.

dq = daq("mcc")
% the |addinput| function adds an analog input channel to
% the dataacquisition.  you can add more than one channel to a
% dataacquisition.
ch1 = addinput(dq, "board0", 0, "voltage");
ch2 = addinput(dq, "board0", 1, "voltage");

dq = 
dataacquisition using measurement computing corp. hardware:
                     running: 0
                        rate: 1000
           numscansavailable: 0
            numscansacquired: 0
              numscansqueued: 0
    numscansoutputbyhardware: 0
                   ratelimit: []
show channels
show properties and methods

acquire timestamped data

the read function starts the acquisition and returns the results as a timetable.

data = read(dq, seconds(1));

plot acquired data

plot(data.time, data.board0_ai0, data.time, data.board0_ai1);
xlabel('time (s)');
ylabel('voltage (v)');

change default properties of the acquisition

by default, acquisitions run for one second at 1000 scans per second. to acquire at a different rate, change the rate property.

dq.rate = 10000;
[data, starttime] = read(dq, seconds(1));
plot(data.time, data.board0_ai0, data.time, data.board0_ai1);
xlabel('time (s)');
ylabel('voltage (v)');