Page 3 - Important Information; Warranty; Patents; WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS
Important Information Warranty The SCB-68 is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defective d...
Page 4 - Compliance; FFCC/Canada Radio Frequency Interference Compliance; Determining FCC Class; Class A; Class B; Federal Communications Commission
Compliance FFCC/Canada Radio Frequency Interference Compliance Determining FCC Class The Federal Communications Commission (FCC) has rules to protect wireless communications from interference. The FCC places digital electronics into two classes. These classes are known as Class A (for use in industr...
Page 5 - Canadian Department of Communications; Compliance to EU Directives
Canadian Department of Communications This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations. Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada. Compliance to EU Directives R...
Page 6 - Contents; About This Manual
© National Instruments Corporation vii SCB-68 Shielded Connector Block User Manual Contents About This Manual Conventions ................................................................................................................... xiNI Documentation...............................................
Page 8 - Glossary
Contents © National Instruments Corporation ix SCB-68 Shielded Connector Block User Manual Selecting a Resistor ......................................................................................... 5-17Adding Components ...............................................................................
Page 9 - Conventions; File»Page Setup»Options; bold
© National Instruments Corporation xi SCB-68 Shielded Connector Block User Manual About This Manual This manual describes the SCB-68 and explains how to use the connector block with National Instruments data acquisition (DAQ) devices. Conventions The following conventions appear in this manual: <...
Page 10 - NI Documentation
About This Manual SCB-68 Shielded Connector Block User Manual xii ni.com NI Documentation For more information about using the SCB-68 with DAQ devices, refer to the following resources: • DAQ device user manuals, at ni.com/manuals • NI Developer Zone, at ni.com/zone
Page 11 - Introduction; What You Need to Get Started
© National Instruments Corporation 1-1 SCB-68 Shielded Connector Block User Manual 1 Introduction The SCB-68 is a shielded I/O connector block with 68 screw terminals for easy signal connection to a National Instruments 68- or 100-pin DAQ device. The SCB-68 features a general breadboard area for cus...
Page 12 - Quick Reference Label
Chapter 1 Introduction SCB-68 Shielded Connector Block User Manual 1-2 ni.com ❑ The following items, if you are adding components (optional): – Soldering iron and solder – Resistors – Capacitors Quick Reference Label A quick reference label for E Series devices is included in this kit. Quick referen...
Page 15 - Installing Cables
Chapter 1 Introduction © National Instruments Corporation 1-5 SCB-68 Shielded Connector Block User Manual Figure 1-1. SCB-68 Parts Locator Diagram Installing Cables The following sections describe how to cable one or more SCB-68 connector blocks to a DAQ device using 68-pin or 100-pin cables. Note F...
Page 21 - Configuring the SCB-68; Start»Programs»National
Chapter 1 Introduction © National Instruments Corporation 1-11 SCB-68 Shielded Connector Block User Manual Configuring the SCB-68 For instructions about using Measurement & Automation Explorer (MAX) to configure the SCB-68 as an accessory for a DAQ device, complete the following steps: 1. Naviga...
Page 24 - Parts Locator and Wiring Guide
© National Instruments Corporation 2-1 SCB-68 Shielded Connector Block User Manual 2 Parts Locator and Wiring Guide This chapter explains how to connect signals to the SCB-68. The following cautions contain important safety information concerning hazardous voltages and terminal blocks. Cautions Keep...
Page 26 - Switch Configuration
Chapter 2 Parts Locator and Wiring Guide © National Instruments Corporation 2-3 SCB-68 Shielded Connector Block User Manual To connect signals to the SCB-68, complete the following steps while referring to Figure 1-1, SCB-68 Parts Locator Diagram , and to Figure 2-1. 1. Disconnect the 68-pin cable f...
Page 27 - Switch Setting
Chapter 2 Parts Locator and Wiring Guide SCB-68 Shielded Connector Block User Manual 2-4 ni.com Table 2-1. Switch Configurations and Affected Signals Switch Setting Applicable Signals Direct feedthrough, with temperature sensor disabled and accessory power disabled Analog input, analog output, digit...
Page 29 - Connecting Signals; Connecting Analog Input Signals; Input Modes
© National Instruments Corporation 3-1 SCB-68 Shielded Connector Block User Manual 3 Connecting Signals This chapter describes the types of signal sources that you use when configuring the channels and making signal connections to the SCB-68, describes input modes, and discusses noise considerations...
Page 31 - Nonreferenced or Floating Signal Sources
Chapter 3 Connecting Signals © National Instruments Corporation 3-3 SCB-68 Shielded Connector Block User Manual Nonreferenced or Floating Signal Sources A floating signal source is a signal source that is not connected in any way to the building ground system, but has an isolated ground-reference po...
Page 32 - Ground-Referenced Signal Sources
Chapter 3 Connecting Signals SCB-68 Shielded Connector Block User Manual 3-4 ni.com Ground-Referenced Signal Sources A grounded signal source is connected in some way to the building system ground; therefore, the signal source is already connected to a common ground point with respect to the DAQ dev...
Page 33 - Differential Connection Considerations (DIFF Input Mode)
Chapter 3 Connecting Signals © National Instruments Corporation 3-5 SCB-68 Shielded Connector Block User Manual Analog Input Channel Configuration Diagram for ACH<i> and ACH<i+8> ). Any signal conditioning circuitry requiring a ground reference should be built in the custom breadboard ar...
Page 35 - Using Bias Resistors
Chapter 3 Connecting Signals © National Instruments Corporation 3-7 SCB-68 Shielded Connector Block User Manual Differential Connections for Nonreferenced or Floating Signal Sources Figure 3-3 shows how to connect a floating signal source to a channel on the DAQ device configured in DIFF input mode....
Page 36 - Single-Ended Connection Considerations
Chapter 3 Connecting Signals SCB-68 Shielded Connector Block User Manual 3-8 ni.com Common-mode rejection might be improved by using another bias resistor between ACH+ or ACH< i >, and AIGND. This connection creates a slight measurement error caused by the voltage divider formed with the outpu...
Page 38 - Connecting Analog Output Signals
Chapter 3 Connecting Signals SCB-68 Shielded Connector Block User Manual 3-10 ni.com Figure 3-5 shows how to connect a grounded signal source to a channel on the DAQ device configured for NRSE input mode. Figure 3-5. Single-Ended Input Connections for Ground-Referenced Signals Connecting Analog Outp...
Page 39 - Connecting Digital Signals
Chapter 3 Connecting Signals © National Instruments Corporation 3-11 SCB-68 Shielded Connector Block User Manual Figure 3-6 shows how to make AO connections and the external reference connection to the SCB-68 and the DAQ device. Figure 3-6. Connecting AO Signals Connecting Digital Signals When using...
Page 40 - Connecting Timing Signals
Chapter 3 Connecting Signals SCB-68 Shielded Connector Block User Manual 3-12 ni.com Figure 3-7. Digital I/O Connections Connecting Timing Signals If you are using a 68-pin or 100-pin DAQ device, all external control over device timing is routed through the programmable function input (PFI) lines &l...
Page 41 - Noise Considerations
Chapter 3 Connecting Signals © National Instruments Corporation 3-13 SCB-68 Shielded Connector Block User Manual All digital timing connections are referenced to DGND. Figure 3-8 demonstrates how to connect two external timing signals to the PFI pins of a DAQ device. Figure 3-8. Timing I/O Connectio...
Page 43 - Using Thermocouples
© National Instruments Corporation 4-1 SCB-68 Shielded Connector Block User Manual 4 Using Thermocouples This chapter describes how to take thermocouple measurements using the SCB-68. A thermocouple is created when two dissimilar metals touch, and the contact produces a small voltage that changes as...
Page 44 - Switch Settings and Temperature Sensor Configuration
Chapter 4 Using Thermocouples SCB-68 Shielded Connector Block User Manual 4-2 ni.com The maximum voltage level thermocouples generate is typically only a few millivolts. Therefore, you should use a DAQ device with high gain for best resolution. You can measure thermocouples in either differential or...
Page 45 - Special Considerations
Chapter 4 Using Thermocouples © National Instruments Corporation 4-3 SCB-68 Shielded Connector Block User Manual Figure 4-1. Single-Ended Switch Configuration For differential operation, connect differential analog channel 0 to the temperature sensor by switching S5 and S4 to the up position, as sho...
Page 47 - Channel Pad Configurations; Conditioning Analog Input Channels; Channel
Chapter 5 Adding Components for Special Functions SCB-68 Shielded Connector Block User Manual 5-2 ni.com You can create virtual channels in MAX to map your voltage ranges to the type of transducer that you are using or to create a custom scale. Channel Pad Configurations When you use the SCB-68 with...
Page 48 - Conditioning Analog Output Channels
Chapter 5 Adding Components for Special Functions © National Instruments Corporation 5-3 SCB-68 Shielded Connector Block User Manual Conditioning Analog Output Channels Figure 5-2 illustrates the generic AO channel pad configuration, and Table 5-2 describes the AO component locations and labels. Fig...
Page 49 - Conditioning PFI0/TRIG1
Chapter 5 Adding Components for Special Functions SCB-68 Shielded Connector Block User Manual 5-4 ni.com Figure 5-3. Analog Output Channel Configuration Diagram for DAC0OUT Conditioning PFI0/TRIG1 Figure 5-4 illustrates the digital input channel configuration, and Figure 5-5 shows the digital input ...
Page 50 - Open Thermocouple Detection
Chapter 5 Adding Components for Special Functions © National Instruments Corporation 5-5 SCB-68 Shielded Connector Block User Manual Accuracy and Resolution Considerations When you measure voltage to subsequently measure current, take the following steps to maximize measurement accuracy: 1. Refer to...
Page 51 - Differential Open Thermocouple Detection
Chapter 5 Adding Components for Special Functions SCB-68 Shielded Connector Block User Manual 5-6 ni.com Differential Open Thermocouple Detection Use position A to connect a high-value resistor between the positive input and +5V. Leave the jumpers in place (positions F and G) for each channel used. ...
Page 52 - Lowpass Filtering; Theory of Operation
Chapter 5 Adding Components for Special Functions © National Instruments Corporation 5-7 SCB-68 Shielded Connector Block User Manual Thermocouple wire error is the result of inconsistencies in the thermocouple manufacturing process. These inconsistencies, or nonhomogeneities, are the result of defec...
Page 55 - One-Pole Lowpass RC Filter
Chapter 5 Adding Components for Special Functions SCB-68 Shielded Connector Block User Manual 5-10 ni.com Figure 5-10. Response of a Real Filter to a Square Wave Input Signal One-Pole Lowpass RC Filter Figure 5-11 shows the transfer function of a simple series circuit consisting of a resistor ( R ) ...
Page 56 - Selecting Components
Chapter 5 Adding Components for Special Functions © National Instruments Corporation 5-11 SCB-68 Shielded Connector Block User Manual Use Equation 5-3 to design a lowpass filter for a simple resistor and capacitor circuit, where the values of the resistor and capacitor alone determine f c . In this ...
Page 57 - Single-Ended Lowpass Filter; Differential Lowpass Filter; Analog Output and Digital Input Lowpass Filtering
Chapter 5 Adding Components for Special Functions SCB-68 Shielded Connector Block User Manual 5-12 ni.com For any type of lowpass filter, use Equation 5-5 to determine the cut-off frequency ( f c ). (5-5) Single-Ended Lowpass Filter To build a single-ended lowpass filter, refer to Figure 5-12. Add t...
Page 58 - Lowpass Filtering Applications; Antialiasing Filtering
Chapter 5 Adding Components for Special Functions © National Instruments Corporation 5-13 SCB-68 Shielded Connector Block User Manual Lowpass Filtering Applications Noise filtering and antialiasing are two applications that use lowpass filters. Noise Filtering You can use a lowpass filter to highly ...
Page 59 - Special Consideration for Analog Input Channels; Special Consideration for Analog Output Signals
Chapter 5 Adding Components for Special Functions SCB-68 Shielded Connector Block User Manual 5-14 ni.com To prevent aliasing, remove all signal components with frequencies greater than the Nyquist frequency from input signals before those signals are sampled. Once a data sample is aliased, it is im...
Page 60 - Special Consideration for Digital Trigger Input Signals
Chapter 5 Adding Components for Special Functions © National Instruments Corporation 5-15 SCB-68 Shielded Connector Block User Manual Figure 5-15. Lowpass Filtering of AO Signals Special Consideration for Digital Trigger Input Signals Lowpass filters can function as debouncing filters to smooth nois...
Page 61 - Measuring a 4 to 20 mA Current
Chapter 5 Adding Components for Special Functions SCB-68 Shielded Connector Block User Manual 5-16 ni.com Apply a lowpass filter to the signal to remove the high-frequency component for a cleaner digital signal, as Figure 5-17 shows. Figure 5-17. Lowpass Filtering of Digital Trigger Input Signals No...
Page 62 - Selecting a Resistor
Chapter 5 Adding Components for Special Functions © National Instruments Corporation 5-17 SCB-68 Shielded Connector Block User Manual Figure 5-18. Current-to-Voltage Electrical Circuit The application software must linearly convert voltage back to current. Equation 5-8 demonstrates this conversion, ...
Page 63 - Adding Components; Differential Inputs; Attenuating Voltage
Chapter 5 Adding Components for Special Functions SCB-68 Shielded Connector Block User Manual 5-18 ni.com Adding Components Caution Do not exceed ±10 V at the analog inputs. NI is not liable for any device damage or personal injury resulting from improper connections. You can build a one-resistor ci...
Page 65 - Accuracy Considerations
Chapter 5 Adding Components for Special Functions SCB-68 Shielded Connector Block User Manual 5-20 ni.com Selecting Components To set up the resistors, complete the following steps: 1. Select the value for R 2 (10 k Ω is recommended). 2. Use Equation 5-12 to calculate the value for R 1 . Base the R ...
Page 66 - Differential Input Attenuators
Chapter 5 Adding Components for Special Functions © National Instruments Corporation 5-21 SCB-68 Shielded Connector Block User Manual Figure 5-20. SCB-68 Circuit Diagram for SE Input Attenuation Install resistors in positions B and F, or positions D and G, depending on the channel you are using on t...
Page 67 - Analog Output and Digital Input Attenuators; Special Considerations for Analog Input
Chapter 5 Adding Components for Special Functions SCB-68 Shielded Connector Block User Manual 5-22 ni.com Analog Output and Digital Input Attenuators To build a two-resistor circuit for attenuating voltages at the DAC0OUT, DAC1OUT, and TRIG1 pins on the SCB-68, refer to the pad positions in Figure 5...
Page 68 - Special Considerations for Analog Output
Chapter 5 Adding Components for Special Functions © National Instruments Corporation 5-23 SCB-68 Shielded Connector Block User Manual Figure 5-23. Input Impedance Electrical Circuit Z in is the new input impedance. Refer to Appendix A, Specifications , in the device user manuals at ni.com/manuals fo...
Page 69 - Special Considerations for Digital Inputs
Chapter 5 Adding Components for Special Functions SCB-68 Shielded Connector Block User Manual 5-24 ni.com Special Considerations for Digital Inputs If you use the V in voltage of Figure 5-20 to feed TTL signals, you must calculate V in so that the voltage drop on R 2 does not exceed 5 V. Caution A v...
Page 70 - Analog Input; Power Requirement; Fuse
© National Instruments Corporation A-1 SCB-68 Shielded Connector Block User Manual A Specifications This appendix lists the SCB-68 specifications. These ratings are typical at 25 °C unless otherwise stated. Analog Input Number of channels 68-pin DAQ devices ....................... Eight differential...
Page 71 - Physical; Maximum Working Voltage; Environmental
Chapter A Specifications SCB-68 Shielded Connector Block User Manual A-2 ni.com Voltage rating .........................................250 V Nominal resistance .................................0.195 Ω Physical Box dimensions (including box feet)......19.5 by 15.2 by 4.5 cm (7.7 by 6.0 by 1.8 in.) I...
Page 72 - Safety; Electromagnetic Compatibility; CE Compliance; Declaration
Chapter A Specifications © National Instruments Corporation A-3 SCB-68 Shielded Connector Block User Manual Safety The SCB-68 meets the requirements of the following standards for safety and electrical equipment for measurement, control, and laboratory use: • IEC 61010-1, EN 61010-1 • UL 3111-1 • CA...
Page 73 - Quick Reference Labels
© National Instruments Corporation B-1 SCB-68 Shielded Connector Block User Manual B Quick Reference Labels This appendix shows the pinouts that appear on the quick reference labels for the DAQ devices that are compatible with the SCB-68.
Page 74 - SCB-68 Quick Reference Label; E SERIES DEVICES
Chapter B Quick Reference Labels SCB-68 Shielded Connector Block User Manual B-2 ni.com Figure B-1. E Series Devices DAC1 OUT DAC0 OUT SCANCLK EXTREF AOGND AOGND AIGND DIO5 51 ACH4 S4 * 68 GENERIC TERMINALS ACCESSORY POWER OFF) (TEMP. SENSOR AND S4 * ACCESSORY POWER ON ON DIFFERENTIAL CH. 0 * TEMP. ...
Page 75 - DEVICES
Chapter B Quick Reference Labels © National Instruments Corporation B-3 SCB-68 Shielded Connector Block User Manual Figure B-2. NI 670 X Devices S4 * 68 GENERIC TERMINALS ACCESSORY POWER OFF) (TEMP. SENSOR AND S5 23 57 S3 S2 S1 58 24 25 59 27 60 26 61 28 VCH1 66 ICH17* 62 29 30 63 64 31 32 65 AGND0/...
Page 77 - S SERIES DEVICES
Chapter B Quick Reference Labels © National Instruments Corporation B-5 SCB-68 Shielded Connector Block User Manual Figure B-4. S Series Devices DAC1OUT DAC0OUT NC SCANCLK AOGND AOGND DIO5 51 S4 * 68 GENERIC TERMINALS ACCESSORY POWER OFF) (TEMP. SENSOR AND S4 * ACCESSORY POWER ON ON DIFFERENTIAL CH....
Page 81 - Fuse and Power
© National Instruments Corporation C-1 SCB-68 Shielded Connector Block User Manual C Fuse and Power One of the +5 V lines from the DAQ device (pin 8) is protected by an 800 mA fuse. Pin 14 is also +5 V, but it is not fuse-protected on the SCB-68. Shorting pin 14 to ground blows the fuse, which is us...
Page 82 - SCB-68 Circuit Diagrams
© National Instruments Corporation D-1 SCB-68 Shielded Connector Block User Manual D SCB-68 Circuit Diagrams This appendix contains illustrations of circuit diagrams for the SCB-68. Figure D-1. +5 V Power Supply +5V (I/O Pin 8) +5V Screw Terminal ACC Not Powered (NC) C2 (10 µ F) XF1 (Clip) 800 mA 5x...
Page 85 - Contact NI
© National Instruments Corporation E-1 SCB-68 Shielded Connector Block User Manual E Soldering and Desoldering on the SCB-68 Some applications discussed here require you to make modifications to the SCB-68, usually in the form of adding components to the printed circuit device. To solder and desolde...
Page 88 - Calibration Certificate
Chapter F Technical Support and Professional Services SCB-68 Shielded Connector Block User Manual F-2 ni.com • Calibration Certificate —If your product supports calibration, you can obtain the calibration certificate for your product at ni.com/calibration . If you searched ni.com and could not find ...
Page 89 - Prefix
© National Instruments Corporation G-1 SCB-68 Shielded Connector Block User Manual Glossary Prefix Meanings Value p- pico 10 – 12 n- nano- 10 – 9 µ - micro- 10 – 6 m- milli- 10 – 3 k- kilo- 10 3 M- mega- 10 6 G- giga- 10 9 Numbers/Symbols ° degrees > greater than ≤ less than or equal to ≥ greater...
Page 97 - Index; Numbers
© National Instruments Corporation I-1 SCB-68 Shielded Connector Block User Manual Index Numbers +5 V signal fuse and power considerations, C-1power supply (figure), D-1 68-pin cables connecting to SCB-68 (figure), 1-6installing, 1-5 to 1-6quick reference label (table), 1-2 100-pin cables connecting...
