Using Measurement Computing Hardware with DASYLab 10.0

Zuletzt geändert 13th Jun 2013
Category:  > DasyLAB
Platform: All
Version: 10
Article Ref.: 11F7A
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DasyLAB 11F7A Using Measurement Computing Hardware with DASYLab 10.0 Before installing DASYLab, it is essential that an up to date version of Instacal is installed. You can download a recent version of Instacal here: Run Instacal, and check that your hardware is detected. Make any hardware configuration changes that you require within Instacal (by double clicking the detected board in the list.) Finally, close Instacal. Do not run Instacal while DASYLab is running. Insert the DASYLab CD and select the option "Install DASYLab." If you have already installed DASYLab, choose the Modify option. Click Next, accepting the default options, until you see the "DASYLab Driver" screen, similar to the one shown below. At the DASYLab Driver screen expand the "Data Acquisition" tree and select "Measurement Computing." Continue through the installation, selecting the default values unless you know that you need a different option. At the end of the installation of DASYLab, you may be prompted to install Datasocket. Click yes, and go through this installation also. When the installation is complete, reboot the machine if prompted. Hardware Setup -------------- The hardware and timing setup of the driver requires some technical knowledge of the features of the particular board that you have purchased. You can find documentation which will contain the information you need in three places: 1) The manual and specifications for the hardware. This will be provided in paper format or on the Data Acquisition CD. Contact tech support if it is missing, as we can email a replacement. 2) The Universal Library Online Reference. This document can be found in the Measurement Computing programs group, under UL Online Reference. Search the index for your hardware, you will find a page of hardware notes and function guides. 3) Contact technical support, we will be happy to advise you of the correct configuration for the particular hardware you are installing. - In DASYLab, please run Measurement->Hardware Setup -> MCC-DAQ -> Hardware Setup... The MCC-DAQ Hardware Set up Dialog will appear. You will see a separate hardware configuration for each recognised, installed Measurement Computing device. *** if your hardware is not listed, close DASYLab and go back and run Instacal *** Select the tab for the hardware you want to configure. Most options should not be changed. Leave the setting as "Standard" However, it is essential to check the Functions tab. On the Functions tab, for cards which do not support channel selectable gain, you need to uncheck the option "cbALoadQueue". For 16 bit cards such as the USB-1608FS, select the option 16 bit. For 14 bit cards such as the USB-1408FS, select the option 14 bit. For 12 bit cards such as the USB-1208LS, select the option 12 bit. When you have checked the Functions options, click OK to close Hardware Setup. Timing Setup ------------ - Open Measurement->Experiment Setup->MCC-DAQ->Measurement Setup... Check the settings for the device that you are using. Increase the buffer size to the maximum value (100 Blocks.) Make sure that the sample rate per channel does not exceed the maximum aggregate rate that the device can support/number of active channels. Some hardware has a minimum value for sample rate. The minimum value for sample rate of the USB-1208LS is 100 Hz/number of active channels. Note for users of USB-1208FS, USB-1408FS and USB-1608FS Some hardware cannot use the option "Autoselect" Block Size. Examples are the USB-1608FS, USB-1408FS and USB-1208FS, which require a block size which is a multiple of 31. For these options, deselect "Auto Select" for the Block Size, and type a value which is a multiple of 31. Choose a value which is of the same order of magnitude as the "Autoselect" Block Size. For example, if the Autoselected block size is 512, you could change it to 620. Finding the Input/Output Modules --------------------------------- The Signal Input and Output modules are located within the Modules menu, within the "Input/Output" -> "MCC-DAQ" group. To add an Analog Input module to the worksheet, hover over Analog Input and hold down the left mouse button. Drag the icon from the Module Browser onto the worksheet. If you have more than one piece of hardware installed, you will be prompted to choose from a list, as shown below. Double click the channels which you want to use. When the module is on the worksheet it will look like this: Double click the module to open the configuration screen, which will look something like this: By default only channel 0 is active. To activate other channels, double left click the "plug" icon on the module. To deactivate a channel, double right click the "plug" icon. It is important that you do not define a non sequential range of channels. The Green Plug represents the channel which is currently being configured, e.g in the screenshot below, channel 0 is active. Set the same channel range for each channel (not NOP.) Select a compatible range, such as BIP10VOLTS. To copy the current channel settings to all active channels, press F8. Synchronization issues ---------------------- Because the MCC-DAQ driver supports independent timing for each device, you may find that you have synchronization problems when combining inputs from different hardware, or combining inputs with modules that by default use the Global Timebase, such as the slider or generator. i) One way to resolve these issues is to use a Latch module (from the Control group) in the mode "Synchronise output data to set input" Use a Latch synchronisation module only for slow signals, such as slow Digital Input channels. Do not pass fast channels through a Latch synchronisation module, although you can use fast channels as the Synchronisation X input to the latch. Each output of the latch will carry the signal of the corresponding input. However, the sample rate and blocksize will be synchronized to the sample rate and block size of the control input X. ii) Modules such as Sliders, Generators and Switches can be directly synchronised to the high speed data being acquired from your data acquisition hardware, by opening the module configuration screen, clicking the Option button, and selecting the Device from the drop down list box in the Synchronization section. See Also Signal Adaption Module Any Problems or Queries? ------------------------ Contact Daq Support by Telephone or Email. Tel: 01462 488882 Email: DasyLAB All 10 en Y

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