Archived: SCC Tutorial Series: SCC-FV01

Publish Date: Aug 10, 2017 | 3 Ratings | 3.33 out of 5 | Print

Overview

This document has been archived and is no longer updated by National Instruments.

This series is designed to demonstrate how to use and configure signal conditioning carrier (SCC) modules. The SCC-FV01 tutorial shows how to make the proper hardware connections to the module and set up a virtual channel in Measurement & Automation Explorer (MAX). The user can then run the attached LabVIEW example using the virtual channel.

Table of Contents

  1. Equipment/Software needed:
  2. Theory of Operation
  3. Run the LabVIEW Example:

1. Equipment/Software needed:

- National Instruments LabVIEW and NI-DAQmx or Traditional NI-DAQ (Legacy) software
- PCI or PXI E Series data acquisition (DAQ) device with cable
- SC-2345 Portable Signal Conditioning Enclosure with power option or SCC-68 Terminal Block
- SCC-FV01 Module

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2. Theory of Operation

The Figure below illustrates key functional components of the SCC-FV01.


Figure 1.


The SCC-FV01 has two input channels designed to measure 0 to 100 Hz and output 0 to 10 VDC. The output is linear with respect to the input frequency. The frequency-to-voltage and analog circuitry for each channel consists of a triggering stage, frequency-to-voltage stage, and an output stage. Refer to the SCC Series User Manual for more information.

NI-DAQmx Instructions

1. Double-click on the Measurement & Automation icon on your desktop. If you don't have the icon on your desktop, you can open MAX by choosing Start»Programs»National Instruments»Measurement & Automation. This brings up the window where you can configure and test your DAQ board.

2. Click on the "+" next to "Devices and Interfaces" on the left side of the screen to show all the NI devices currently installed in your computer.

3. Click the "+" next to "NI-DAQmx Devices" to show all NI-DAQmx devices.

4. Right-click on "NI-DAQmx Devices" and select Create New NI-DAQmx Device...»NI-DAQmx SCC Connector Block and choose the SCC carrier you have cabled to your DAQmx device.

5. A dialog will open, allowing you to select the device your carrier is cabled to, and the configuration of your carrier.  Also from this dialog, use the selection boxes to choose which module is in each slot of your carrier.


6. You have completed the basic setup of your module. Now all you need to do is configure a virtual channel that will allow you to easily take measurements from your strain gauge in LabVIEW.

Virtual Channel Configuration for NI-DAQmx:

Virtual channels allow you to quickly and easily configure channels for measurements using a variety of transducers. Scales for many transducers have already been created for you, thereby eliminating the need for these types of functions in your LabVIEW applications. The next few steps show how to create a virtual channel for taking measurements with the SCC-FV01 module

1. Right-click on Data Neighborhood, and select Create New. This brings up the first screen of the Channel Wizard, which allows you to create a new virtual channel.

2. Select NI-DAQmx Global Virtual Channel, and click Next. On the next screen, Select Analog Input »Frequency, and you will get a list of all compatible channels you have available in your computer.

3. Select one of the channels in your SCC carrier, which will be labeled as SCC1Mod# by default.  Enter a name for your Global Virtual Channel.

4. A window will then open allowing you to configure your new Virtual Channel.  Make sure you select the correct Scaled Units and Signal Input Range.  Select the Level and Hysteresis you would like to use.  Click Save to save all your settings and make the Global Virtual Channel available to programs outside of MAX.

Traditional NI-DAQ (Legacy) Instructions


1. Please follow the instructions in the SCC Series User Manual to connect the DAQ device and SC-2345.

2. Please follow the instructions in the SCC-FV01 User Guide to connect a signal to the SCC-FV01.

2. Once you have connected the signal to the SCC-FV01 module, you can insert the module into one of the analog input sockets in the SC-2345 (sockets J1 – J8).

3. Next you will need to configure your DAQ device in MAX to work with the SCC module.

4. Double-click on the Measurement & Automation icon on your desktop. This brings up the window where you can configure and test your DAQ device.

5. Click on the “+” next to “Devices and Interfaces” on the left side of the screen to show all National Instruments devices that are currently installed on the computer.


Figure 2.



6. Right click on the DAQ device cabled to the SC-2345, and select Properties from the short-cut menu that appears.

7. Click on the Accessory tab in the dialog box that appears.


Figure 3.




8. Select SC-2345 from the pull-down menu and click the Configure… button. A dialog box similar to the one shown in the following figure should appear.


Figure 4.


9. Click on the socket number that the SCC-FV01 module is in, and click the Add button. You will be able to select the SCC-FV01 module from a context menu that appears. The module name should now be listed next to the socket number in place of “Empty”.


Figure 5.


10. You have completed the basic setup of your module. Now all you need to do is configure a virtual channel that will allow you to easily take frequency measurements with LabVIEW from the signal you connected earlier.

Virtual Channel Configuration for Traditional NI-DAQ (Legacy):

Virtual channels allow you to quickly and easily configure channels for measurements using a variety of transducers. The following steps will show you the procedure for creating a virtual channel that takes measurements with the SCC-FV01 module.

1. Right-click on Data Neighborhood, and select Create New…. This brings up the first screen of the Channel Wizard, which allows you to create a new Virtual Channel.


Figure 6.



2. Select Virtual Channel, and click Finish. On the next screen, leave the type of channel in the default Analog Input setting and click Next. Type in a name for the channel and a description for that channel. Then click Next.


Figure 7.




3. The next screen contains a pull-down menu that you can use to choose one of several ready-made measurement types. Choose Frequency as the measurement type. Then click Next. Set the Units to be Hz and range to be 0-100 Hz. This range is the one supported by the SCC-FV01 module. Click Next to continue.


Figure 8.




4. Since you do not need to scale the signal, select No Scaling on the signal-scaling window and press Next.

5. On the last screen, verify that the DAQ device you installed is selected, and set the channel number to the DAQ channel your signal is connected to. You can find this number on the connector block below the socket of your module. For example, socket J1 corresponds to channel 0. This information is also illustrated in the figure below.


Figure 9.



6. Click Finish to complete setting up this channel. You now have a new channel with the name you gave it under the Data Neighborhood category.

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3. Run the LabVIEW Example:

1. Use the link below to navigate to the SCC Example Series document which contains two LabVIEW VIs.  Open the VI for your Data Acquisition driver in LabVIEW 7.1 or later, and follow the instructions to configure the acquisition task.

2. Run the VI.

3. Hit the STOP button to halt the program.

Related Links:
SC-2345 User Manual
SCC Series User Manual
SCC Example Series: SCC-FV01

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