National Instruments SCXI-1305 Installation Manual

National Instruments SCXI-1305 Installation Manual

Ac/dc coupling bnc terminal block
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INSTALLATION GUIDE
SCXI -1305 AC/DC C
T
B
ERMINAL
Introduction
The SCXI-1305 limits the maximum common-mode voltage of the
Caution
SCXI-1120/D, SCXI-1121, SCXI-1125, and SCXI-1126 to 42 V
level may injure you. National Instruments is not liable for damage or injuries resulting
from improper connection.
What You Need to Get Started
National Instruments
, ni.com
trademarks or trade names of their respective companies.
322313B-01
© Copyright 1999, 2000 National Instruments Corp. All rights reserved.
LOCK
This guide describes how to install and use your SCXI-1305 AC/DC
coupling BNC terminal block.
The SCXI-1305 is a shielded terminal block with BNC and SMB
connectors that you can connect to the SCXI-1120/D, SCXI-1121,
SCXI-1125, SCXI-1126, SCXI-1140, or SCXI-1141/1142/1143 input
connectors. You can configure each SCXI-1305 channel to AC- or
DC-couple a signal to an SCXI module. Each channel can
ground-reference a floating signal with a bias resistor.
The terminal block has eight BNC and one SMB connector for easy
connection. The eight BNCs are for signal connections to the eight module
inputs. The SMB provides access to module digital signals, HOLDTRIG
for the SCXI-1140, and OUTCLK and EXTCLK for the
SCXI-1141/1142/1143. These signals are not active on the SCXI-1120/D,
SCXI-1121, SCXI-1125, and SCXI-1126.
To set up and use your SCXI-1305 terminal block, you need the following
items:
SCXI-1305 terminal block
SCXI-1305 AC/DC Coupling BNC Terminal Block Installation Guide
, and SCXI
are trademarks of National Instruments Corporation. Product and company names mentioned herein are
BNC
OUPLING
or DC. Exceeding this
peak
December 2000

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Summary of Contents for National Instruments SCXI-1305

  • Page 1 SCXI-1120/D, SCXI-1121, SCXI-1125, and SCXI-1126 to 42 V or DC. Exceeding this peak level may injure you. National Instruments is not liable for damage or injuries resulting from improper connection. What You Need to Get Started To set up and use your SCXI-1305 terminal block, you need the following items: ❑...
  • Page 2 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. SCXI-1305 Installation Guide ni.com...
  • Page 3: Safety Information

    If the device is damaged, turn the device off and do not use it until service-trained personnel can check its safety. If necessary, return the device to National Instruments for service and repair to ensure that its safety is not compromised.
  • Page 4: Configuring Floating Or Ground-Referenced Signals

    SCXI-1120/D, SCXI-1121, SCXI-1125, or SCXI-1126. • Use the G position with ground-referenced sources. Setting the switch to the G position disconnects the resistor from the signal path. Always use this position on the SCXI-1120/D, SCXI-1121, SCXI-1125, and SCXI-1126. SCXI-1305 Installation Guide ni.com...
  • Page 5: Configuring The Channels For Ac Or Dc Coupling

    For the SCXI-1120/D, SCXI-1121, SCXI-1125, and SCXI-1126, there is an effective 2 MΩ resistor instead of two 1 MΩ Ω resistors. This 2 M resistor is referenced to the negative input of the SCXI-1120/D, SCXI-1121, SCXI-1125, and SCXI-1126 instead of ground to maintain the SCXI-1120/D, SCXI-1121, SCXI-1125, and SCXI-1126 isolation. © National Instruments Corporation SCXI-1305 Installation Guide...
  • Page 6: Configuring The Clock

    The top set of switches (S1, S2, and S3) corresponds to input channel 0, the next set down (S4, S5, and S6) corresponds to input channel 1, and so on. The bottom set of switches (S22, S23, and S24) corresponds to input channel 7. SCXI-1305 Installation Guide ni.com...
  • Page 7 SCXI-1120/D, SCXI-1125, SCXI-1126, SCXI-1140, and SCXI-1141/1142/1143. Signal names printed in blue are for the SCXI-1121. When connecting your signals to the SCXI-1305, follow the labeling on the SCXI-1305 for the appropriate module. 1 Mating Connector...
  • Page 8 15 SMB Connector 6 Channel 4 Switches 12 Floating/Ground Reference Switches Figure 2. SCXI-1305 Signal Connections Signal names printed in black (the first name in the pair) are for the SCXI-1120/D, Note SCXI-1125, SCXI-1126, SCXI-1140, and SCXI-1141/1142/1143. Signal names printed in blue (the second name in the pair) are for the SCXI-1121.
  • Page 9: Installing The Terminal Block

    Circuit Diagram You do not need to read this section to operate the SCXI-1305. The circuit diagram in Figure 3 is optional information that you can use if you want more details about the SCXI-1305 circuitry. Figure 3 shows the circuitry for one of the eight analog channels.
  • Page 10: Specifications

    In instrumentation terminology, DC coupling means that both DC and AC signals are passed. AC coupling means that DC signals are blocked and AC signals are passed. Does not apply to the SCXI-1120/D, SCXI-1121, SCXI-1125, or SCXI-1126. SCXI-1305 Installation Guide ni.com...
  • Page 11 Auxiliary connectors....... 1 female SMB connector Signal connector spacing ....1.8 cm (0.75 in.) Ground-referencing You can configure the SCXI-1305 for use with either ground-referenced or non-referenced (floating) signal sources on a per-channel basis using slide switches. When a channel is configured for use with a non-referenced (floating) signal source, CH–...
  • Page 12: Technical Support Resources

    Technical Support Resources NI Web Support National Instruments Web support is your first stop for help in solving installation, configuration, and application problems and questions. Online problem-solving and diagnostic resources include frequently asked questions, knowledge bases, product-specific troubleshooting wizards, manuals, drivers, software updates, and more.
  • Page 13 Norway 32 27 73 00, Poland 0 22 528 94 06, Portugal 351 1 726 9011, Singapore 2265886, Spain 91 640 0085, Sweden 08 587 895 00, Switzerland 056 200 51 51, Taiwan 02 2528 7227, United Kingdom 01635 523545 © National Instruments Corporation SCXI-1305 Installation Guide...

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