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INSTALLATION GUIDE
SCXI -1328 H
™
T
B
ERMINAL
Introduction
What You Need to Get Started
CVI™, LabVIEW™, National Instruments™, ni.com™, NI-DAQ™, and SCXI™ are trademarks of National Instruments Corporation. Product and
company names are trademarks or trade names of their respective companies.
321877B-01
© Copyright 1993, 1999 National Instruments Corp. All rights reserved.
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IGH
LOCK
This guide describes how to install and use the SCXI-1328 high-accuracy
isothermal terminal block with the SCXI-1120, SCXI-1120D, and
SCXI-1121 modules.
The SCXI-1328 high-accuracy isothermal terminal block consists of a
shielded board with screw terminals to connect to the SCXI module input
connector. The SCXI-1328 has a high-precision thermistor and an
aluminum isothermal plate to minimize the temperature gradients across
the screw terminals when you measure thermocouples.
The terminal block has 18 screw terminals for easy connection. One pair of
screw terminals connects to the SCXI module chassis ground. With the
SCXI-1120/D or SCXI-1125, the remaining eight pairs of screw terminals
are for signal connection to the eight module inputs. With the SCXI-1121,
four pairs of screw terminals are for the four module inputs and four pairs
are for the module excitation channels.
To set up and use your SCXI-1322 terminal block, you need the following
items:
SCXI-1328 terminal block
SCXI-1328 High-Accuracy Isothermal Terminal Block Installation
Guide
SCXI chassis
SCXI-1120, SCXI-1120D, SCXI-1125, or SCXI-1121 module
I
CCURACY
SOTHERMAL
November 1999
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Related Manuals for National Instruments SCXI-1328
Summary of Contents for National Instruments SCXI-1328
- Page 1 Guide SCXI chassis SCXI-1120, SCXI-1120D, SCXI-1125, or SCXI-1121 module CVI™, LabVIEW™, National Instruments™, ni.com™, NI-DAQ™, and SCXI™ are trademarks of National Instruments Corporation. Product and company names are trademarks or trade names of their respective companies. 321877B-01 © Copyright 1993, 1999 National Instruments Corp. All rights reserved.
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Page 2: Safety Information
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. SCXI-1328 Installation Guide www.ni.com... - Page 3 If the device is damaged, turn the device off and do not use 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.
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Page 4: Temperature Sensor Output And Accuracy
Temperature Sensor Output and Accuracy The SCXI-1328 temperature sensor outputs 1.91 to 0.58 V from 0 to 55 °C and has an accuracy of ±0.5 °C over the 15 to 35 °C range and ±0.9 °C over the 0 to 15 °C and 35 to 55 °C ranges National Instruments software can convert a thermistor voltage to the thermistor temperature for the circuit diagram shown later in this guide. -
Page 5: Signal Connection
When connecting your signals to the SCXI-1328, follow the labeling on the SCXI-1328 for the appropriate module, as indicated in Figure 2. To connect the signal to the terminal block, perform the following steps, referring to Figures 1 and 2 as necessary: Unscrew the top cover screws and remove the cover. - Page 6 Figure 1 shows the SCXI-1328 terminal block parts locator diagram. Back View Front View 1 Strain-Relief Bar 3 Safety-Ground 4 Mating Connector 6 Top Cover Screws 2 Strain-Relief Screws Solder Lug 5 Thumbscrew 7 Top Cover Figure 1. SCXI-1328 Parts Locator Diagram Figure 2 shows the SCXI-1328 signal connections.
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Page 7: Installation
Includes the combined effects of the temperature sensor accuracy and the temperature difference between the temperature sensor and any screw terminal. The temperature sensor accuracy includes tolerances in all component values, the effects caused by temperature and loading, and self-heating. © National Instruments Corporation SCXI-1328 Installation Guide... -
Page 8: Temperature Sensor Circuit Diagram
Temperature Sensor Circuit Diagram You do not need to read this section to operate the SCXI-1328. The circuit diagram in Figure 3 is optional information you can use if you want more details about the SCXI-1328 temperature sensor. +5 V 4.7 k... - Page 9 Netherlands 0348 433466, Norway 32 27 73 00, Poland 48 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 2377 1200, United Kingdom 01635 523545 © National Instruments Corporation SCXI-1328 Installation Guide...