National Instruments IMAQ SCB-100 User manual

INSTALLATION GUIDE
SCB-100
100-Pin Female SCSI to 100-Pin Female Screw Terminal, Desktop
Mount Terminal Block
This document describes how to connect and use the SCB-100 with 100-pin data acquisition
(DAQ) devices and lists specifications. The SCB-100 is a shielded I/O connector block with
100 screw terminals for easy signal connection to the following NI devices and modules:
• Digital I/O (DIO)—NI 6508, NI 6509, NI 6511, NI 6512, NI 6513, NI 6514, NI 6515,
NI 6527, NI 6528, NI 6529, PCI-DIO-96
• Counter/Timer—NI 6624
• Multifuntion I/O (MIO)—NI 6025E, NI 6031E, NI 6033E, NI 6071E
• Other devices with a 100-pin 0.050 series shielded D-type I/O connector
Note To use the SCB-100 with a digital I/O or counter/timer device, you must
change the default switch setting. Refer to Using the SCB-100 with Digital I/O and
Counter/Timer Devices for more information.
Figure 1. SCB-100 Parts Locator Diagram
3
75
4
6
2
1
89
1. Quick Reference Label (Optional)
2. Top Cover
3. Connector Screw
4. Grounding Screw
5. 100-Pin I/O Connector
6. Enclosure Base
7. Strain-Relief Bar
8. Strain-Relief Screw
9. SCB-100 Board Assembly

Contents
Icons.......................................................................................................................................... 2
Safety Guidelines...................................................................................................................... 2
Electromagnetic Compatibility Guidelines...............................................................................3
What You Need to Get Started..................................................................................................4
Getting Started with the SCB-100............................................................................................ 5
Using the SCB-100 with Digital I/O and Counter/Timer Devices............................................6
Using the SCB-100 with Multifunction I/O Devices................................................................7
Connecting Nonreferenced or Floating Signal Sources to Analog Inputs........................ 9
Connecting Ground-Referenced Signal Sources to Analog Inputs.................................10
Using the SCB-100 for Thermocouple Measurements .................................................. 10
Removing the Board .............................................................................................................. 12
Soldering, Desoldering, and Cutting Via Traces on the SCB-100 Board .............................. 12
Specifications.......................................................................................................................... 12
Where to Go Next................................................................................................................... 15
Worldwide Support and Services............................................................................................ 15
Icons
Notice—Take precautions to avoid data loss, loss of signal integrity, degradation of
performance, or damage to the model.
Caution—Take precautions to avoid injury. Consult the model documentation for
cautionary statements when you see this icon printed on the model. Cautionary
statements are localized into French for compliance with Canadian requirements.
Shock Warning—Take precautions to avoid electrical shock.
Safety Guidelines
The following cautions contain important safety information concerning hazardous voltages
and connector blocks.
Caution The protection provided by the model can be impaired if it is used in a
manner not described in the user documentation.
Attention La protection apportée par le modèle risque d'être endommagée s'il est
utilisé d'une autre façon que celle décrite dans la documentation utilisateur.
Caution Do not connect hazardous voltages (>30 V RMS/42 V peak/60 V DC).
Refer to your product documentation for information about the electrical limits of
your device or module.
2| ni.com | SCB-100 Installation Guide

Attention Ne pas connecter à des tensions dangereuses (> 30 Veff/42 Vpic/
60 VCC). Reportez-vous à la documentation de votre produit pour plus
d'informations sur les limites électriques de votre appareil ou module.
Caution Install cover prior to use. To avoid electrical shock, do not remove
SCB-100 covers unless you are qualified to do so. Before removing the cover,
disconnect any live circuit from the connector block. Replace cover for use.
Attention Installez le capot de protection avant l'utilisation. Pour éviter tout choc
électrique, ne retirez pas le capot de protection du SCB-100, sauf si vous êtes
qualifié pour le faire. Avant de retirer le capot de protection, déconnectez tout circuit
sous tension du bloc de connexion. Remettez en place le capot de protection avant
l'utilisation.
Notice The grounding screws on your SCB-100 are for grounding high-impedance
sources, such as a floating source (1 mA maximum) and for terminating the shields
of connected cables. Do not use the grounding screws as safety earth ground.
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory requirements and limits for
electromagnetic compatibility (EMC) as stated in the product specifications. These
requirements and limits are designed to provide reasonable protection against harmful
interference when the product is operated in its intended operational electromagnetic
environment.
This product is intended for use in residential, commercial, and industrial locations. However,
harmful interference may occur in some installations or when the product is connected to a
peripheral device or a test object. To minimize interference with radio and television reception
and prevent unacceptable performance degradation, install and use this product in strict
accordance with the instructions in the product documentation.
Furthermore, any changes or modifications to the product not expressly approved by National
Instruments could void your authority to operate it under your local regulatory rules.
Notice To ensure the specified EMC performance, operate this product only with
shielded cables and accessories.
Notice To ensure the specified EMC performance, signal wires routed outside of
the enclosure must be contained within a shielded cable and connected to shielded
accessories. Cable shields must be terminated to the chassis ground lug using as
short a connection as is practical.
SCB-100 Installation Guide | © National Instruments | 3

What You Need to Get Started
• SCB-100
• (Optional) Quick reference label PDF
Note You can find quick reference labels, which specify accessory pinout
information for many compatible devices, by going to ni.com/r/scb100labels.
• 100-pin DAQ device and device documentation
• Cable for your device:
– SH100M-100M Flex cable (formerly known as SH100-100-F), part number
185095-0x, for digital I/O and counter/timer devices
– SH100M-100M cable (formerly known as SH100100), part number 182853-0x, for
multifunction I/O devices
• Phillips #1 and #2 screwdrivers
• 14 AWG to 26 AWG wire
• Wire cutters
• Wire insulation strippers
• 1/8 in. flathead screwdriver
4| ni.com | SCB-100 Installation Guide

Getting Started with the SCB-100
Figure 2. SCB-100 Board Parts Locator Diagram
2
4
6
6
1
3
5
9
6
3
7
8
3
3
1. Switches S4, S5, and S6
2. 100-Pin I/O Connector
3. Board Mount Screw Hole
4. Signal Accessory Power LED (DS1)
5. Switches S1, S2, and S3
6. Screw Terminals
7. Breadboard Area
8. Vias Shorted to Screw Terminal
9. Cold-Junction Compensation Temperature Sensor
Complete the following steps while referring to the previous figures. If you have not already
installed your DAQ device or module, refer to the getting started guide that came with your
device for instructions. Remove all cables from the SCB-100 before getting started.
1. Remove the grounding screws on either side of the top cover with a Phillips #1
screwdriver. Open the top cover.
2. (Optional) Attach the quick reference label to the inside of the cover. To find quick
reference labels for most compatible devices, go to ni.com/r/scb100labels.
SCB-100 Installation Guide | © National Instruments | 5

3. Configure switches for the signal types you are using, as explained in Using the SCB-100
with Digital I/O and Counter/Timer Devices or Using the SCB-100 with Multifunction I/O
Devices.
4. Loosen the strain-relief bar by removing the strain-relief screws with a #2 Phillips
screwdriver.
5. Connect the wires to the screw terminals by stripping off ¼ in. of the wire insulation,
inserting the wires into the screw terminals, and securely tightening the screws with the
flathead screwdriver to a torque of 0.5 N⋅m to 0.6 N⋅m (4 in.⋅lb to 5 in.⋅lb).
6. Reinstall the strain-relief (if removed) and tighten the strain-relief screws. If the shielded
cable is too large to route through the strain-relief hardware, either use multiple,
smaller-diameter cables or remove the top strain-relief bar and add insulation or padding
if necessary to constrain the cable.
7. Reinsert the grounding screws to ensure proper shielding.
8. Replace the cover.
9. Connect the SCB-100 to the device using the cable.
10. Launch Measurement & Automation Explorer (MAX). In the left panel, expand Devices
and Interfaces to confirm that your DAQ device or module is recognized, and then
configure your device settings.
11. (Optional) Configure the DAQ device or module connected to the SCB-100 by
completing the following steps.
a. In MAX, right-click your DAQ device or module and select Configure.
b. Configure the device or module properties and click OK.
12. Test specific device functionality. Run a Test Panel in MAX by right-clicking your DAQ
device or module and selecting Test Panels. Click Start to test the device or module
functions.
Note When you have finished using the SCB-100, power off any external signals
connected to the SCB-100 before you power off your computer.
Using the SCB-100 with Digital I/O and
Counter/Timer Devices
Digital I/O (NI 65xx) devices, counter/timer (NI 66xx) devices, and DAQ devices without
analog input functionality must use the direct feedthrough mode. Move the switches to the
direct feedthrough mode switch setting as shown in the following table.
6| ni.com | SCB-100 Installation Guide

Table 1. Digital I/O and Counter/Timer Devices Switch Setting
Switch Setting Description
S6 S5 S4
S1
S2
S3
Direct feedthrough mode—Move switches S1, S2, S3, S4, S5,
and S6 to the positions shown on the left. In this mode:
• All 100 signals from the DAQ device connect directly to
screw terminals
• The signal accessory power LED (DS1) does not light in this
configuration.
Refer to the following figure for a detailed diagram.
Figure 3. Direct Feedthrough Mode Switch Setting
Temperature
Sensor
DAQ Device Cable SCB-100 Screw
Terminal
100
99
1
100
99
1
2
2
NC
NC
NC
LED
S6 S5 S4
S1
S2
S3
Refer to your device documentation for device signal information.
Using the SCB-100 with Multifunction I/O
Devices
You can take measurements with the SCB-100 and multifunction I/O (NI 60xxE) devices in a
number of ways. The SCB-100 has a temperature sensor for cold-junction compensation to
accommodate thermocouples. Switches S4, S5, and S6 configure the temperature sensor for
different analog input settings. The following table shows the different switch settings for
multifunction I/O devices.
SCB-100 Installation Guide | © National Instruments | 7

Table 2. Multifunction I/O Device Switch Settings
Switch Setting Description
S6 S5 S4
S1
S2
S3
MIO with disabled temperature sensor mode (default
configuration)—Move switches S1, S2, S3, S4, S5, and S6 to the
positions shown on the left. In this mode:
• The temperature sensor is not used.
• AI 0 and AI 8 are available on screw terminals.
• The signal accessory power LED (DS1) lights when the
device is powered and connected to the SCB-100.
Refer to the following figure for a detailed diagram.
S6 S5 S4
S1
S2
S3
MIO with single-ended temperature sensor mode—Move
switches S1, S2, S3, S4, S5, and S6 to the positions shown on the
left. In this mode:
• The temperature sensor can be read using AI 0 in referenced
single-ended (RSE) mode.
• AI 8 is available on a screw terminal.
• The signal accessory power LED (DS1) lights when the
device is powered and connected to the SCB-100.
Refer to the following figure for a detailed diagram.
S6 S5 S4
S1
S2
S3
MIO with differential temperature sensor mode—Move
switches S1, S2, S3, S4, S5, and S6 to the positions shown on the
left. In this mode:
• The temperature sensor can be read using AI 0 and AI 8 in
differential mode.
• The signal accessory power LED (DS1) lights when the
device is powered and connected to the SCB-100.
Refer to the following figure for a detailed diagram.
S6 S5 S4
S1
S2
S3
Direct feedthrough mode—You can use direct feedthrough
mode with a multifunction I/O device.
Refer to Using the SCB-100 with Digital I/O and Counter/Timer
Devices for configuration information and a detailed diagram.
8| ni.com | SCB-100 Installation Guide

Figure 4. MIO Device Modes Switch Settings
Temperature
Sensor
DAQ Device Cable SCB-100
LED
S5
S4
Screw
Terminal
100
99
6
5
2
1
4
34
3
100
99
6
5
2
1
4
34
3
S6
S1
S2
S3
+5 V
AI 0
AI 8
Other
Pins
Refer to your device documentation for device signal information.
Connecting Nonreferenced or Floating Signal Sources
to Analog Inputs
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 point or isolated output. Some examples
of floating signal sources are outputs for the following: thermocouples, transformers, battery-
powered devices, optical isolators, and isolation amplifiers. The ground reference of a floating
signal source must be tied to the ground of the device to establish a local or onboard reference
for the signal. If this reference is not established, erratic readings from the board will occur.
•Differential Inputs—To provide a return path for the instrumentation amplifier bias
currents, floating signal sources must have a 10 kΩ to 100 kΩ resistor connected to the
AI GND signal line on one input if DC-coupled, or both inputs if AC-coupled. For
detailed information on connections to floating signal sources and differential inputs,
refer to your device documentation.
•Single-Ended Inputs—When measuring floating signal sources, configure the
multifucntion I/O device for referenced single-ended (RSE) input to supply a ground
reference. In this configuration, the negative input of the device instrumentation amplifier
SCB-100 Installation Guide | © National Instruments | 9

is tied to the analog ground. For detailed information on connections to floating signal
sources and single-ended inputs, refer to your device documentation.
Connecting Ground-Referenced Signal Sources to
Analog Inputs
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 device
(assuming the host computer is plugged into the same power system). Nonisolated outputs of
instruments and devices that plug into the building power system fall into this category.
•Differential Inputs—Ground-referenced signal sources do not require special
components added to the SCB-100 board. For detailed information about connections to
ground-referenced signal sources and differential inputs, refer to your device
documentation.
•Single-Ended Inputs—When measuring ground-referenced signals, the external signal
supplies its own reference ground point; the device should not supply one. Configure the
device for nonreferenced, single-ended (NRSE) input mode. In this configuration, all of
the signal grounds should be tied to AI SENSE, which connects to the negative input of
the instrumentation amplifier on the device. Referencing the signal to AI GND can cause
inaccurate measurements resulting from an incorrect ground reference. For detailed
information on connections to ground-referenced signal sources and single-ended inputs,
refer to your device documentation.
Using the SCB-100 for Thermocouple Measurements
The maximum voltage level generated by thermocouples is typically a few millivolts.
Therefore, for best resolution, use an multifunction I/O device with a high gain.
Thermocouples can be measured in either differential or single-ended configurations:
•Differential Inputs—Differential configuration has better noise immunity than
single-ended configuration. You must install bias resistors when the device is set for
differential mode; the device must have a ground reference because thermocouples are
floating signal sources.
•Single-Ended Inputs—Single-ended configuration has twice as many inputs as
differential configuration. Configure the device for referenced single-ended (RSE) inputs.
Cold-junction compensation with the SCB-100 is accurate only if the temperature sensor
reading is close to the actual temperature of the screw terminals. Therefore, when reading
thermocouples, keep the SCB-100 away from drafts or other temperature gradients such as
those caused by heaters, radiators, fans, and warm equipment.
Optional Input Filtering and Broken Thermocouple Detection
To reduce noise, you can build a simple RC lowpass filter in the breadboard area.
Build broken-thermocouple-detection circuitry by connecting a high-value resistor between
the positive input and +5 V. The value of this resistor is relatively unimportant; a few
10 | ni.com | SCB-100 Installation Guide

megaohms or more works fine. You can detect an open or defective thermocouple with a
high-value resistor. If the thermocouple opens, the voltage measured across the input terminals
rises to +5 V, a value much larger than any legitimate thermocouple voltage.
Sources of Error
When making thermocouple measurements with the SCB-100 and a device, there are the
following possible sources of error:
•Compensation Error—Can arise from two sources: inaccuracy of the temperature
sensor and temperature differences between the sensor and the screw terminals. The
sensor on the SCB-100 is specified to be accurate to ±0.5 °C. Minimize temperature
differences between the sensor and the screw terminals by keeping the SCB-100 away
from drafts, heaters, and warm equipment.
•Linearization Error—A consequence of the polynomials being approximations of the
true thermocouple output. The linearization error depends upon the degree of polynomial
used.
•Measurement Error—The result of inaccuracies in the device, including gain and offset.
If the device is properly calibrated, the offset error should be zero. The only remaining
error is a gain error of ±0.08% of full range (refer to the device specifications). If the
input range is ±10 V and the gain is 500, gain error contributes 0.0008 by 20 mV, or
16 μV of error. If the Seebeck coefficient of a thermocouple is 32 μV/°C, this
measurement error adds 0.5 °C of uncertainty to the measurement. For best results, use a
well-calibrated device so that offsets can be ignored. Eliminate offset error by grounding
one channel on the SCB-100 and measuring the voltage. This value, the offset of the
device, then can be subtracted by software from all other readings.
•Thermocouple Wire Error—The result of inconsistencies in the thermocouple
manufacturing process. These inconsistencies, or nonhomogeneities, are the result of
defects or impurities in the thermocouple wire. The errors vary widely depending on the
thermocouple type and even the gauge of wire used, but a value of ±2 °C is typical.
For best results, use an average of at least 100 readings to reduce the effects of noise.
Temperature Sensor Output and Accuracy
The SCB-100 temperature sensor outputs 10 mV/°C and has an accuracy of ±0.5 °C.
You also can determine the temperature using the following formulas:
TC= 100 × Vt
TK=TC+ 273.15
TF=9
5×TC+ 32
SCB-100 Installation Guide | © National Instruments | 11

Where Vt is the temperature sensor output voltage; and TK, TF, and TC are the temperature
readings in degrees Kelvin, degrees Fahrenheit, and degrees Celsius, respectively.
Note Use the average of a large number of samples to obtain the most accurate
reading. Noisy environments require averaging more samples for greater accuracy.
Removing the Board
You can remove the board from the enclosure to solder components into place. To remove the
board, complete the following steps.
1. Disconnect the 100-pin cable from the SCB-100, if connected.
2. Remove the grounding screws on either side of the top cover with a Phillips #1
screwdriver.
3. Open the top cover.
4. Loosen the strain-relief screws with a Phillips #2 screwdriver.
5. Remove the signal wires from the screw terminals.
6. Remove the board mount screws and 100-pin connector screws.
7. Tilt the board up and pull it out of the enclosure.
Soldering, Desoldering, and Cutting Via Traces
on the SCB-100 Board
The applications discussed here require you to make modifications to the printed circuit board,
usually in the form of adding components or cutting jumpers. Use a low-wattage soldering
iron (20 W to 30 W) when soldering to the board.
To desolder on the SCB-100, vacuum-type tools work best. Use care when desoldering to
avoid damaging component pads.
Use only rosin-core, electronic-grade solder. Acid-core solder damages the printed circuit
board and components.
For each screw terminal, there are one or two vias next to the silkscreen showing the screw
terminal number, as shown in the SCB-100 Parts Locator Diagram, number 8. The vias are
shorted to the screw terminal so you can solder a component to the via to connect it to the
screw terminal signal.
The trace between each pair of vias can be cut if needed.
Specifications
The following specifications are typical at 25 °C, unless otherwise noted.
12 | ni.com | SCB-100 Installation Guide

Cold-Junction Sensor
Accuracy ±0.5 °C
Output 10 mV/°C
Power Requirements
Power consumption (at +5 VDC ±5%),
typical
10 mA with no signal conditioning installed
Note Limit the current drawn from the host computer's +5 VDC to 800 mA
maximum.
Physical Characteristics
Screw terminals
Number 101, including one No Connect (NC)
Wire gauge 14 AWG to 26 AWG
Torque 0.5 N⋅m to 0.6 N⋅m (4 in.⋅lb to 5 in.⋅lb)
Enclosure dimensions 17.93 cm × 15.37 cm × 4.50 cm
(7.06 in. × 6.05 in. × 1.77 in.)
Weight 897 g (1 lb 15.6 oz)
I/O connector One 100-pin female 0.050 series shielded
D-type connector
Safety Voltages
Maximum voltage 30 V RMS, 42 V peak, 60 V DC
Caution Do not connect the SCB-100 to signals or use for measurements within
Measurement Categories II, III, or IV.
Attention Ne connectez pas le SCB-100 à des signaux et ne l'utilisez pas pour
effectuer des mesures dans les catégories de mesure II, III ou IV.
Environmental
Operating temperature 0 °C to 55 °C
Storage temperature -55 °C to 125 °C
Relative humidity 5% to 90% noncondensing
Maximum altitude 2,000 m
Pollution Degree 2
Indoor use only
SCB-100 Installation Guide | © National Instruments | 13

Safety
This product is designed to meet the requirements of the following standards of safety for
electrical equipment for measurement, control, and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1
• CAN/CSA-C22.2 No. 61010-1
Note For UL and other safety certifications, refer to the product label, or visit
ni.com/product-certifications, search by model number or product line, and click the
appropriate link in the Certification column.
CE Compliance
This product meets the essential requirements of applicable European Directives, as follows:
• 2011/65/EU; Restriction of Hazardous Substances (RoHS)
Product Certifications and Declarations
Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance
information. To obtain product certifications and the DoC for NI products, visit ni.com/
product-certifications, search by model number, and click the appropriate link.
Environmental Management
NI is committed to designing and manufacturing products in an environmentally responsible
manner. NI recognizes that eliminating certain hazardous substances from our products is
beneficial to the environment and to NI customers.
For additional environmental information, refer to the Commitment to the Environment web
page at ni.com/environment. This page contains the environmental regulations and directives
with which NI complies, as well as other environmental information not included in this
document.
Waste Electrical and Electronic Equipment (WEEE)
EU Customers At the end of the product life cycle, all NI products must be
disposed of according to local laws and regulations. For more information about
how to recycle NI products in your region, visit ni.com/environment/weee.
电子信息产品污染控制管理办法（中国 RoHS）
中国客户 National Instruments 符合中国电子信息产品中限制使用某些有害物
质指令(RoHS)。关于 National Instruments 中国 RoHS 合规性信息，请登录
ni.com/environment/rohs_china。(For information about China RoHS
compliance, go to ni.com/environment/rohs_china.)
14 | ni.com | SCB-100 Installation Guide

Where to Go Next
The following documents contain information that you may find helpful as you use this
document:
• Documentation for your DAQ module or device at ni.com/manuals
• LabVIEW, LabWindows™/CVI™, Measurement Studio, Visual Basic, and ANSI C
examples at ni.com/r/daqmxexp
•Measurement & Automation Explorer Help
•NI-DAQmx Help
Worldwide Support and Services
The NI website is your complete resource for technical support. At ni.com/support, you have
access to everything from troubleshooting and application development self-help resources to
email and phone assistance from NI Application Engineers.
Visit ni.com/services for information about the services NI offers.
Visit ni.com/register to register your NI product. Product registration facilitates technical
support and ensures that you receive important information updates from NI.
NI corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas,
78759-3504. NI also has offices located around the world. For support in the United States,
create your service request at ni.com/support or dial 1 866 ASK MYNI (275 6964). For
support outside the United States, visit the Worldwide Offices section of ni.com/niglobal to
access the branch office websites, which provide up-to-date contact information.
SCB-100 Installation Guide | © National Instruments | 15

Information is subject to change without notice. Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for
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371224D-01 March 23, 2020