National Instruments VXI-TB-196 User manual

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names are trademarks or trade names of their respective companies.
321349A-01 © Copyright 1996 National Instruments Corp. All rights reserved. September 1996
VXI-TB-196/296 TERMINAL BLOCK
This guide describes how to connect signals and install the
VXI-TB-196 and VXI-TB-296 (196/296) terminal blocks with your
VXI-MIO and VXI-DIO modules.
Introduction
The VXI-TB-196/296 terminal block has a shielded board with either
96 or 192 screw terminals for connection to the VXI-MIO and
VXI-DIO front panel connectors, respectively. The VXI-TB-196/296
can easily accommodate thermocouples, RTDs, strain gauges,
thermistors, millivolt sources, volt sources, and current-loop receivers.
What You Need to Get Started
You need the following to set up and use your VXI-TB-196/296
terminal block:
❏ One or more of the following terminal blocks:
VXI-TB-196
VXI-TB-296
❏ VXI-TB-196/296 Terminal Block Installation Guide
❏ VXIbus chassis
❏ One or more VXI-DAQ module(s) and documentation
❏ Phillips-head number 1 and number 2 screwdrivers
❏ 0.09 in. flathead screwdriver
❏ Long-nose pliers
❏ Wire cutter
❏ Wire insulation stripper

2
Signal Connection
Perform the following steps to connect the signals to the terminal
block. The called-out numbers refer to items in Figure 1.
1. To access the screw terminals (9), remove the terminal block
cover (5) by loosening the three cover screws (6) with a Phillips-
head number 1 screwdriver. These screws stay attached to the
cover without falling out.
2. Choose the wire opening (Figure 2) through which your signal
wires will pass and loosen the appropriate strain-relief bar screws
(11) with a Phillips-head number 2 screwdriver. You can
completely remove the strain-relief bar (12) for easier access.
3. Use a wire cutter and wire insulation stripper to strip the wire
ends as necessary to connect them to screw terminals.
4. Loosen the screws in the screw terminals (9) with a 0.09 in.
flathead screwdriver.
5. To connect the wires to the screw terminals, insert the stripped
wires into the screw terminals. Tighten the screws with a 0.09 in.
flathead screwdriver.
6. Replace the strain-relief bar, if necessary, and tighten the strain-
relief bar screws.
Note: If the strain-relief bar screws protrude past the bottom of the terminal
block, replace the screws with 6-32 Phillips panhead screws that are
shorter than 3/4 in.
7. Replace the terminal block cover and tighten the cover screws.

3
Figure 1 shows the VXI-TB-196 terminal block parts locator diagram.
The VXI-TB-296 will have two screw terminal boards inside, instead
of the single board shown in the VXI-TB-196.
14
2
12
11
10
7
9
8
6
5
13
4
3
1
1 Handle Recess Area 5 Cover 9 Screw Terminal 12 Strain-Relief Bar
2 Mounting Screw 6 Cover Screw 10 Safety Shield 13 Bottom of Cover
3 Grounding Lug 7 Terminal Board 11 Strain-Relief Bar Screw 14 Slide-in Card
4 Safety Shield Screw 8 Board Screw
Figure 1. VXI-TB-196 Parts Locator Diagram

4
Figure 2 shows the screw terminal board inside the uncovered
VXI-TB-196 terminal block. The VXI-TB-296 will have two screw
terminal boards inside, instead of the single board shown in the
VXI-TB-196.
2
1
1 Wire Opening 2 Screw Terminal Board
Figure 2. VXI-TB-196 Screw Terminal Board
You can now connect the terminal block to the VXI-DAQ module
front panel connector.
Installing Your Terminal Block
Perform the following steps to connect the terminal block to the
VXI-DAQ module front panel connector. The called-out numbers refer
to items in Figure 3.
1. Make sure that the VXI-DAQ module attachment screws (1) are
tightened to the VXIbus chassis.
2. Guide the terminal block onto the VXI-DAQ module front panel
connector (7) by aligning the terminal block handle recess area
(3) to the ejector handles (2) on the VXI-DAQ module.
3. Connect the VXI-DAQ module front panel connector to its mating
connector (6) on the terminal block.
4. Tighten the top and bottom mounting screws (5) on the back of
the terminal block to hold it securely in place.

5
1
3
5
67
4
8
2
1 Attachment Screw 3 Handle Recess Area 5 Mounting Screw 7 Front Panel Connector
2 Ejector Handle 4 VXI-TB-196/296 6 Mating Connector 8 VXI-DAQ Module
Figure 3. Installing the Terminal Block on the VXI-DAQ Module