SCXI-1300/1301 Terminal Block Installation Guide
Contents
1. o AAAA AAAA A AAAA AA AAAA AAAA AAAA ANAA 1 Channel 0 2 Chassis Ground 3 Thermocouple Figure 4 Connecting a Thermocouple to SCXI 1300 Channel 0 National Instruments Corporation 7 SCXI 1300 1301 Terminal Block SCXI 1102 B C If you are using a ground referenced thermocouple connect the thermocouple positive and negative leads to and CH respectively If you are using a non referenced floating thermocouple choose one of the two options to ground the thermocouple e Ground the negative lead of the thermocouple near the thermocouple junction e Ground the negative lead of the thermocouple inside the SCXI 1300 terminal block by connecting CH to CHSGND as shown in Figure 4 In most applications this is the most convenient grounding option UN Caution Do not reference the thermocouple to ground at more than one point to avoid measurement errors caused by ground loops Converting the Temperature Sensor Output Voltage to Temperature The integrated circuit temperature sensor outputs 10 mV C If your application software does not provide voltage to temperature conversion for the cold junction reference CJR of the SCXI 1300 you can determine the CJR temperature using the following formulas T C 100 rer 39 where Vrrypouris the temperature sensor output voltage and T F and are the temp2. S E 1 Screw Terminals 2 Mating Connector Figure 2 SCXI 1300 Signal Connections SCXI 1300 1301 Terminal Block 4 www ni com When connecting signals to the SCXI 1301 terminal block follow the labeling on the SCXI 1301 terminal block as indicated in Figure 3 o INOS INON DD NOAA Oo iE EN 1 LNO JA LNO3 Oo X eo 1NO J D DID DD D O DD DG o im i I N mE INOS SLNAN OIULSNI IUNOLLUN Ix oO BIASSU IX2S 049 10 U n3a NZS 1 Screw Terminals 2 Mating Connector Figure 3 SCXI 1301 Signal Connections You are ready to connect the terminal block to the module front connector as explained in the Connecting the Terminal Block to the SCXI Module section National Instruments Corporation 5 SCXI 1300 1301 Terminal Block Connecting the Terminal Block to the SCXI Module To connect the terminal block to the SCXI module front connector perform the following steps 1 Connect the SCXI 1300 1301 terminal block to the mating connector on the module front connector 2 Tighten the top and bottom thumbscrews on the back of the terminal block to hold it securely in place Using the SCXI 1300 with Thermocouples This section describes how to use the thermocouple capability of yo
3. INSTALLATION GUIDE JWINSTRUMENTS SCXI 1300 1301 TERMINAL BLock This guide describes how to install and use the SCXI 1300 and SCXI 1301 terminal block with your SCXI module Introduction The following sections describe the SCXI 1300 1301 terminal blocks and their associated screw terminals SCXI 1300 Using the SCXI 1300 terminal block with 32 channel SCXI modules you can conveniently connect signals through screw terminals Your terminal block has the following features SCXI 1301 Seventy two screw terminals A cold junction temperature sensor Thirty two pairs of screw terminals that connect to the 32 differential inputs of the SCXI module Two screw terminals that connect to the module functional chassis ground pins A solder lug available as a safety chassis ground Additional screw terminals connect to the SCXI module OUTPUT the SCXI module AOREF and to the SCXIbus GUARD Using the SCXI 1301 terminal block which has 20 screw terminals you can conveniently connect signals to the SCXI 1140 module Your terminal block has the following features Eight pairs of screw terminals connect to the eight differential inputs of the SCXI 1140 module Two screw terminals that connect to the AGND of the module Additional screw terminals that connect to the HOLD signal and functional chassis ground LabVIEW National Instruments ni com and SCXI are trademarks of National Instruments Corporation Product and compa
4. erature readings in degrees Fahrenheit and degrees Celsius respectively ER Note Average a large number of samples to obtain the most accurate reading Reading the Temperature Sensor in LabVIEW SCXI 1300 1301 Terminal Block In LabVIEW the channel address string used to read depends on which module is connected to the SCXI 1300 For more information about channel string arrays and the SCXI channel addressing syntax see the LabVIEW Data Acquisition Basics Manual SCXI 1100 use obx scy mdz mtemp This channel address string cannot be in a channel string array with other channels on the same SCXI 1100 module SCXI 1102 B C use obx scy mdz mtemp This channel address string can be in the same channel string array as other channels on the same 8 www ni com SCXI 1102 B C module but it must be the first element in the channel string array SCXI 1104 C not applicable Since the SCXI 1104 C is unsuitable for use with thermocouples Vr mrour is not routed through the module Cleaning the Terminal Block Specifications To remove light dust use a soft nonmetallic brush To remove other contaminants use deionized water and a stiff nonmetallic brush The unit must be completely dry and free from contanimants before returning to service specifications are typical at 25 unless otherwise specified Electrical Cold Junction Sensor on the SCXI 1300 Environment Sensor type ise
5. ny names mentioned herein are trademarks or trade names of their respective companies 322715A 01 Copyright 2000 National Instruments Corp All rights reserved May 2000 What You Need to Get Started To set up and use your SCXI 1300 1301 terminal block you need the following items C SCXI 1300 or SCXI 1301 terminal block SCXI 1300 1301 Terminal Block Installation Guide SCXI chassis SCXI module Your SCXI module user manual Number 1 and 2 Phillips head screwdrivers 1 8 in flathead screwdriver Long nose pliers Wire cutter D LE D BD r5 oo Be E Wire insulation stripper SCXI 1300 1301 Terminal Block 2 www ni com Connecting Signal Wires to the Terminal Block Connect signal wires to the terminal block using the following procedure referring to Figures 1 2 and 3 as necessary Unscrew the top cover screws and remove the top cover 2 Loosen the strain relief screws and remove the strain relief bar Back View Front View 1 Strain Relief Bar 3 Earth Ground 4 Mating Connector 6 Top Cover Screws 2 Strain Relief Screws Solder Lug 5 Thumbscrew 7 Top Cover Figure 1 SCXI 1300 1301 Parts Locator Diagram 3 Runthe signal wires through the strain relief opening You can add insulation or padding if necessary 4 Prepare your signal wire by stripping the insulation to no more than 7 mm 5 Connect the signal wires to the screw terminals by inserting the stripped end of the wire full
6. rires Integrated circuit LM35CAZ ACCUFACyle aceite ace pes 1 3 C from 0 to 50 C Repeatability sess 0 5 Outpost eR CAES 0 to 0 5 V from 0 to 50 C 10 mV C Operating 0 to 50 Storage temperature 20 to 70 C Relative humidity 10 to 9096 Indoor use only 1 This includes the accuracy of the temperature sensor itself 0 9 C and the temperature difference between the temperature sensor and any screw terminal which may be as large as 0 4 National Instruments Corporation 9 SCXI 1300 1301 Terminal Block 322715 01 May00
7. ur SCXI 1300 terminal block Connecting Thermocouples SCXI 1100 If you are using a ground referenced thermocouple connect the thermocouple positive and negative leads to and CH respectively Leave jumper W1 on the SCXI 1100 in the factory default parking position If you are using a non referenced floating thermocouple the SCXI 1100 instrumentation amplifier can be driven into saturation if the thermocouple is not grounded properly Choose one of the following two options to ground the thermocouple e Ground the negative lead of the thermocouple near the thermocouple junction Leave jumper W1 on the SCXI 1100 in the factory default parking position e Ground the negative lead of the thermocouple inside the SCXI 1300 terminal block by connecting CH to CHSGND as shown in Figure 4 In most applications this is the most convenient grounding option Leave jumper W1 on the SCXI 1100 in the factory default parking position B Note National Instruments does not recommend setting jumper W1 on the SCXI 1100 in the non parking position This grounds the negative terminal on the SCXI 1100 instrumentation amplifier through a 100 KQ resistor possibly increasing measurement noise and settling time SCXI 1300 1301 Terminal Block 6 www ni com 766 o UNOILIUN Bey 00 I IX2S SINAWNS ud I i I b
8. y into the terminals and tighten the screws with a flathead screwdriver Tighten the screws to a torque of 5 to 7 in Ib UN Caution Uninsulated wire extending past the screw terminal increases the risk of short circuiting adjacent signals causing the circuit to fail National Instruments Corporation 3 SCXI 1300 1301 Terminal Block 6 Reinstall the strain relief bar and tighten the strain relief screws 7 Reinstall the top cover and tighten the top cover screws When connecting signals to the SCXI 1300 terminal block follow the labeling on the SCXI 1300 terminal block as indicated in Figure 2 o 8 CH ES E IEEE S c 5 ood 2 m OF cna om CES oy e n m g CHIS e CH 5 E Z a 8 D cue S cH ZS ood x ti S gay aS e Pood az cH 8 S OR m 222 2 a gt 1 BY 209 x g9 Ui d 8 129 ooo m cea 89 CH20_ 2 E 4 S S S in S aS 009 Q 55 mooo gt S 25 aS S 100 AT 29 so E S Jo Q m aS Ch 2P E of zt 8298
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