National Instruments SCXI-1384K User manual

ASSEMBLY AND INSTALLATION GUIDE
SCXI -1384K Custom Terminal
Block Kit
This guide describes how to assemble your custom terminal block, make
signal connections, and install your custom terminal block.
Introduction
The SCXI-1384K custom terminal block installs in front of the SCXI-1129
module. This terminal block allows you to easily turn the SCXI-1129
module into a high-density matrix configuration designed to meet your
needs.
You can use the SCXI-1384K custom terminal block with the SCXI-1129
module to create a custom matrix without any extra wiring except for
connecting your signals to the rows and columns of the matrix. You can also
combine the rows and/or columns to create many different matrix
configurations. Refer to Chapter 2, Using the SCXI-1129, in the SCXI-1129
User Manual for more information.
The SCXI-1384K custom terminal block has solder terminals that provide
access to each of the four 4 ×16 matrixes. Also, connections for scanner
advanced and external trigger signals are available.
Note Common matrix terminology describes matrixes by the number of rows by the
number of columns they contain. For example, four rows by 16 columns would be written
as 4 × 16.
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Conventions
The following conventions are used in this guide:
This icon denotes a note, which alerts you to important information.
This icon denotes a caution, which advises you of precautions to take to
avoid injury, data loss, or a system crash.
italic Italic text denotes variables, emphasis, a cross reference, or an introduction
to a key concept. This font also denotes text that is a placeholder for a word
or value that you must supply.
monospace Text in this font denotes text or characters that you should enter from the
keyboard, sections of code, programming examples, and syntax examples.
This font is also used for the proper names of disk drives, paths, directories,
programs, subprograms, subroutines, device names, functions, operations,
variables, filenames and extensions, and code excerpts.
Getting Started
To assemble and use your SCXI-1384K custom terminal block, you need
the following items:
❑SCXI-1384K custom terminal block kit
– Front panel
– Rear panel
–Base
– Two pieces of insulator foam tape
– Insulator
– Safety ground lug
– Upper strain-relief bar
– Lower strain-relief bar
– Snap-on top cover
– Printed circuit board (PCB)
– 180-position mating connector
– Two thumbscrews
– Five #6 sheet metal screws
– Two 10-32 × 3/4 inch machine screws
– Two 4-40 ×3/8 inch machine screws
– Two 4-40 nuts with nylon inserts
– Front graphical overlay

©National Instruments Corporation 3 SCXI-1384K Custom Terminal Block Kit
❑This document
❑SCXI chassis
❑SCXI-1129 module
❑SCXI-1129 User Manual
❑Number 1 and 2 Phillips-head screwdrivers
❑1/8 inch slotted head screwdriver
❑Long-nose pliers
❑1/4 inch hex driver or wrench
❑Wire cutter
❑Wire insulation stripper
❑Soldering iron
❑Solder
Safety Information
The following cautions contain important safety information concerning
hazardous voltages.
Caution Do not operate the device in an explosive atmosphere or where there may be
flammable gases or fumes.
Keep away from live circuits. Do not remove equipment covers or shields unless you are
trained to do so. If signal wires are connected to the device, hazardous voltages can exist
even when the equipment is turned off. To avoid a shock hazard, do not perform procedures
involving cover or shield removal unless you are qualified to do so and disconnect all field
power prior to removing covers or shields.
Equipment described in this document must be used in an Installation Category I1
environment according to IEC 60664-1. This category requires local level supply
mains-connected installation.
Do not operate damaged equipment. The safety protection features built into this device
can become impaired if the device becomes damaged in any way. If the device is damaged,
power off the device and do not use it until service-trained personnel can check its safety.
1 Category I refers to a signal level such as voltages of an isolation transformer secondary on a PWB.

SCXI-1384K Custom Terminal Block Kit 4 ni.com
If necessary, return the device to National Instruments for service and repair to ensure that
its safety is not compromised.
Do not operate this equipment in a manner that contradicts the information specified in this
document. Misuse of this equipment could result in a shock hazard.
Do not substitute parts or modify equipment. Because of the danger of introducing
additional hazards, do not install unauthorized parts or modify the device. Return the
device to NI for service and repair to ensure that its safety features are not compromised.
You must insulate all of your signal connections to the highest voltage with which the
SCXI-1384K custom terminal block can come in contact.
When using the device with high common-mode voltages, you must insulate your signal
wires for the highest input voltage. NI is not liable for any damages or injuries resulting
from inadequate signal wire insulation. Use only 26-20 AWG wire with a minimum
voltage rating of 150 V and a temperature value of 60 °C for measuring up to 150 V.
When connecting or disconnecting signal lines to the SCXI circuit board, make sure the
lines are powered off. Potential differences between the lines and the SCXI ground can
create a shock hazard while you connect the lines.
Connections, including power signals to ground and vice versa, that exceed any of the
maximum signal ratings on the SCXI device can create a shock or fire hazard, or can
damage any or all of the boards connected to the SCXI chassis, the host computer, and the
SCXI device. NI is not liable for any damages or injuries resulting from incorrect signal
connections.
If hazardous voltages (≥30 Vrms and 42.4 Vpeak or 60 VDC) are present, you must connect
a safety earth-ground wire to the cable safety-ground lug, shown in Figure 6. This complies
with safety agency requirements and protects against electric shock when the cable is not
connected to the chassis. To connect the safety earth-ground to the safety-ground lug, run
an earth-ground wire from the signal source to the cable. NI is not liable for any damages
or injuries resulting from inadequate safety earth-ground connections.
Do not loosen or re-orient the safety-ground lug hardware when connecting the
safety-ground wire; to do so reduces the safety isolation between the high voltage and
safety ground.
Clean the module and accessories by brushing off light dust with a soft non-metallic brush.
Remove other contaminants with a stiff non-metallic brush. The unit must be completely
dry and free from contaminants before returning it to service. The terminal block must be
used with a UL-listed SCXI chassis.

©National Instruments Corporation 5 SCXI-1384K Custom Terminal Block Kit
Unpacking
Remove the package contents and inspect the terminal block for missing
components or for any signs of damage. Notify NI if any of the components
appear damaged in any way. Do not install a damaged terminal block onto
your system.
Assembling Your Custom Terminal Block
To assemble your custom terminal block, complete the following sections.
Assembling the Strain-Relief
To assemble the strain-relief, complete the following:
1. Adhere insulator foam tape to the upper and lower strain-relief bars as
shown in Figure 1.
2. Use two 10-32 ×3/4 inch screws to loosely combine the upper
strain-relief bar to the lower strain-relief bar leaving enough space for
your signal connections.
Figure 1. Strain-Relief Parts Locator Diagram
1 10-32 ×3/4 Inch Screws
2 Upper Strain-Relief Bar
3 Insulator Foam Tape
4 Lower Strain-Relief Bar
1
4
2
3

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Assembling the Front Panel
To assemble the front panel, complete the following steps:
1. Install the safety ground lug and strain-relief assembly to the front
panel using two 4-40 × 3/8 inch screws as shown in Figure 2.
2. Secure the strain-relief assembly to the front panel with two 4-40 nuts.
Figure 2. Connecting the Strain-Relief Assembly and Front Panel
1 Strain-Relief Assembly
2 4-40 ×3/8 Inch Screws
3 Safety Ground Lug
4 4-40 Nuts
5 Front Panel
1
34
2
5

©National Instruments Corporation 7 SCXI-1384K Custom Terminal Block Kit
Installing the Front Panel
To install the front panel, complete the following steps:
1. Adhere insulator to the base as shown in Figure 3.
2. Attach front panel assembly to base using two #6 sheet metal screws
as shown in Figure 3.
3. Adhere front graphical overlay to front panel as shown in Figure 3.
Figure 3. Installing the Front Panel Assembly
1 Front Graphical Overlay
2 Front Panel Assembly
3 #6 Sheet Metal Screws
4Base
5 Insulator
1
4
3
5
2

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Attaching the Mating Connector
To attach the mating connector, complete the following steps:
1. Orient the180-position connector as shown in Figure 4.
2. Attach the 180-position connector to the side of the PCB with the
solder terminals.
3. Solder each pin of the180-position connector to the PCB.
Figure 4. Attaching the Mating Connector
1PCB 2 180-Position Connector
2
1

©National Instruments Corporation 9 SCXI-1384K Custom Terminal Block Kit
Connecting Signals
Note Refer to the Safety Information section before connecting or disconnecting any
signal wires.
1. Prepare your signal wire by stripping the insulation no more than 3/16
of an inch.
2. Pull your signal wires at least one foot through the strain-relief opening
on the front panel assembly as shown in Figure 5.
Figure 5. SCXI-1384K Custom Terminal Block Final Assembly
1 Signal Wires
2Base
3 Extrusion Rails
4 180-Position Connector
5PCB
6 Thumbscrews
7 #6 Sheet Metal Screws
8 Rear Panel
9 Snap-On Top Cover
2
1
9
8
3
3
5
6
7
4

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3. Connect the safety earth ground to the safety ground lug. Refer to the
Safety Information section for connection information.
4. Connect the wires to the terminals by soldering the stripped end of the
wire onto the terminal. Trim all soldered connections to a 1/16 inch
maximum on the back side of the PCB. When connecting your signals,
refer to the labeling in Figure 6.
Figure 6. SCXI-1384K Custom Terminal Block Signal Connections
1 Row Connection Solder Terminals
2 Strain-Relief Bar Assembly
3 Safety Ground Lug
4 5 V Reference
5 Ground Reference for Trigger Signal Solder Terminals
6 Scanner Advanced Output (SCANADV) Solder Terminal
7 External Trigger Input (EXTRIGIN) Solder Terminal
8 Column Connection Solder Terminals
2
7
6
5
3
1
8
4