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INSTALLATION GUIDE
SCXI -1327 H
™
T
B
ERMINAL
Introduction
Note
For correct operation with the SCXI-1121 module, you must bypass the attenuators
on the excitation channels.
™
™
CVI
, LabVIEW
, National Instruments
names mentioned herein are trademarks or trade names of their respective companies.
321930C-01
© Copyright 1998, 2000 National Instruments Corp. All rights reserved.
-V
IGH
OLTAGE
LOCK
This guide describes how to install and use the SCXI-1327 high-voltage
attenuator terminal block with the SCXI-1120, SCXI-1120D, SCXI-1121,
SCXI-1125, and SCXI-1126 modules.
The SCXI-1327 high-voltage attenuator terminal block is shielded and has
screw terminals that connect to the SCXI-1120, SCXI-1120D, SCXI-1121,
SCXI-1125, or SCXI-1126 input connector. Each SCXI-1327 channel has
a precision 100:1 resistive voltage divider that you can use to measure
voltages of up to 300 V
SCXI-1120D, SCXI-1121, SCXI-1125, or SCXI-1126. You can
individually bypass these dividers for low-voltage measurement
applications.
The terminal block has 18 screw terminals for easy signal connection.
One pair of screw terminals connects to the SCXI-1120, SCXI-1120D,
SCXI-1121, SCXI-1125, or SCXI-1126 chassis ground. When used with
the SCXI-1120, SCXI-1120D, SCXI-1125, or SCXI-1126, the remaining
eight pairs of screw terminals connect signals to the eight module inputs.
When used with the SCXI-1121, four pairs of SCXI-1327 screw terminals
connect signals to four module inputs and the remaining four pairs of
SCXI-1327 screw terminals connect signals to four module excitation
outputs.
™
™
™
, ni.com
, NI-DAQ
, and SCXI
A
TTENUATOR
or ±300 VDC with the SCXI-1120,
rms
™
are trademarks of National Instruments Corporation. Product and company
October 2000
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Table of Contents
Related Manuals for National Instruments SCXI-1327
Summary of Contents for National Instruments SCXI-1327
- Page 1 ™ OLTAGE TTENUATOR ERMINAL LOCK This guide describes how to install and use the SCXI-1327 high-voltage attenuator terminal block with the SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1125, and SCXI-1126 modules. Introduction The SCXI-1327 high-voltage attenuator terminal block is shielded and has screw terminals that connect to the SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1125, or SCXI-1126 input connector.
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Page 2: What You Need To Get Started
What You Need to Get Started To set up and use your SCXI-1327 terminal block, you need the following items: ❑ SCXI-1327 high-voltage attenuator terminal block ❑... -
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 The High-Voltage Attenuator
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. National Instruments is not liable for any damages or injuries resulting from incorrect signal connections. -
Page 5: Connecting Signals
Table 1. SCXI-1327 High-Voltage Attenuator Configuration Switch Position Description Enables the attenuator for a specific channel. 100:1 This is the default setting. Bypasses the attenuator for a specific channel. 100:1 For correct operation with the SCXI-1121 module, you must bypass the attenuators Note on the excitation channels. - Page 6 Figure 1. SCXI-1327 Parts Locator Diagram Run the signal wires through the strain-relief opening. You can add insulation or padding if necessary. When connecting your signals to the SCXI-1327, follow the labeling on the Note SCXI-1327 for the appropriate module, as indicated in Figure 2.
- Page 7 9 Voltage Dividers 5 Channel Labeling for the SCXI-1120, SCXI-1120D, SCXI-1125, SCXI-1126 Figure 2. SCXI-1327 Signal Connections Connect the signal wires to the screw terminals by inserting the stripped end of the wire fully into the terminal. No bare wire should extend past the screw terminal.
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Page 8: Installing The Terminal Block
The unit must be completely dry and free from contaminants before returning it to service. Calibrating the Terminal Block For information on calibrating the SCXI-1327, see the SCXI-1327 High-Voltage Attenuator Terminal Block Calibration Procedure located online at and follow the link for Manual ni.com/calibration... - Page 9 This includes the accuracy of the temperature sensor itself (±0.5 °C) and the temperature difference between the sensor and any screw terminal (which may be as large as ±0.4 °C). © National Instruments Corporation SCXI-1327 Installation Guide...
- Page 10 Relative humidity ........5 to 90% noncondensing Altitude (maximum) .......2000 m Safety Designed in accordance with IEC 61010-1, UL 3111-1, and CAN/CSA C22.2 No. 1010.1 for electrical measuring and test equipment. Installation category II Pollution degree 2 SCXI-1327 Installation Guide ni.com...
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Page 11: Electromagnetic Compatibility
See the Declaration of Conformity for this product for any additional regulatory compliance information. Temperature Sensor Output and Accuracy The SCXI-1327 temperature sensor outputs 1.91 to 0.65 V from 0 to 50 °C. Converting a Thermistor Voltage to a Temperature National Instruments software can convert a thermistor voltage to the thermistor temperature for the circuit diagram shown in Figure 3. -
Page 12: Reading The Temperature Sensor In Labview
In LabVIEW, the channel string used to read V depends on which TEMPOUT module is connected to the SCXI-1327. For more information about channel-string arrays and the SCXI channel-addressing syntax, see the LabVIEW Measurements Manual. This section is not applicable to the SCXI-1126. -
Page 13: Temperature Sensor Circuit Diagram
Temperature Sensor Circuit Diagram You do not need to read this section to operate the SCXI-1327. The circuit diagram in Figure 3 is optional information that you can use if you want more details about the SCXI-1327 temperature sensor. +5 V 4.7 k... -
Page 14: 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. Web support is available through the Technical Support section of ni.com...