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Using the SCB-68 Breadboard and Filter Areas

Hardware: PXI/CompactPCI>>Controllers

Problem:
What is the breadboard/filter area on a SCB-68? Why and how would I use it?

Solution:
The SCB-68 has many connections that can be used for user-defined custom circuitry or filtering. It consists of two main areas: the breadboard section and the filter section.

The Breadboard Area consists of the two grids of holes between the three columns of screw-terminals. It can be used for soldering any prototyping circuitry or connecting any external circuitry. It is important to note that none of the holes are connected to any other. (The blank 3x3 area is due to a support stud on the opposite side.)

The Filter Area is located primarily to the left of the screw terminals (although a small analog output filter area is located in the lower right corner). This area can be used for filtering or hooking up load resistors. For more information on using filters in this area, see KnowledgeBase 3CAI9HPS: Analog Input Lowpass Filtering with an SCB-68 Terminal Block.

• What is the resistance of the resistors (F+G) already in the filter area and why are they there? - These resistors are 0 Ohm resistors and are there for filter design. They can be used if the filter you are designing needs both a resistor and capacitor in parallel and another resistor in series. If necessary, you can also unsolder the 0 Ohm resistor and replace it with your own resistor.


• Why and how would I use a load resistor? - A load resistor is used to measure a current with a voltage input board. By measuring the voltage across a known resistance you can then determine the current by using V=IR. To configure the wiring for this situation, connect your current source to the input terminal and then wire a resistor across B or D (depending on which terminal is connected to your signal). The current signal would come in through the screw terminal on the board, flow across resistor F or G (0 Ohm resistor), and then flow across resistor B or D. This creates a measurable voltage at the pin that can be read by the DAQ card.

  For more information about which pins connect to which channels, please refer to the  Advanced Functions User Manual for the SCB-68

Figure: Analog Input Channel Configuration Diagram for ACH and ACH

Related Links:
Product Manuals: SCB-68 User Guide (March 2009)
Product Manuals:SCB-68 User Manual for Advanced Functions (March 2009)
KnowledgeBase 3CAI9HPS: Analog Input Lowpass Filtering with an SCB-68 Terminal Block

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Report Date: 12/01/2005
Last Updated: 02/16/2010
Document ID: 3S0HBN01

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