National Instruments SCXI-1321 Installation Manual Download | Manualshive

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SCXI-1321 Terminal Block Installation Guide

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ni.com

Figure 1.

SCXI-1321 Parts Locator Diagram

1

Strain-Relief Bar

2

Strain-Relief Screws

3

Safety-Ground Lug

4

Mating Connector

5

Thumbscrew

6

Top-Cover Screws

7

Top Cover

Back View

Front View

2

1

3

4

5

7

6

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Summary of Contents for SCXI-1321

Page 1: ...strain gauge shunt calibration This terminal block was primarily designed for Wheatstone bridge transducers such as strain gauges although it can easily accommodate thermocouples RTDs thermistors mill...

Page 2: ...ames functions operations variables filenames and extensions and code excerpts monospace italic Italic text in this font denotes text that is a placeholder for a word or value that you must supply Wha...

Page 3: ...is in current mode 4 Run the signal wires through the strain relief opening You can add insulation or padding if necessary 5 Prepare the signal wire by stripping the insulation no more than 7 mm 0 28...

Page 4: ...stallation Guide 4 ni com Figure 1 SCXI 1321 Parts Locator Diagram 1 Strain Relief Bar 2 Strain Relief Screws 3 Safety Ground Lug 4 Mating Connector 5 Thumbscrew 6 Top Cover Screws 7 Top Cover Back Vi...

Page 5: ...ock to hold it securely in place 4 Refer to the Performed or Supported Signal Conditioning section for information on specific signal conditioning 1 Screw Terminals 2 Product Information 3 W1 CH0 Null...

Page 6: ...01 k 1 RNULL 39 k 5 RTRIM 10 k Nulling potentiometer Range 0 to 10 k Step size infinite user adjustable Mechanical Resistor sockets Connecting lead size 0 023 to 0 026 in Connecting lead length 0 110...

Page 7: ...1010 1 EN 61010 1 UL 3111 1 UL61010B 1 CAN CSA C22 2 No 1010 1 Note For UL and other safety certifications refer to the product label or to ni com Electromagnetic Compatibility Emissions EN 55011 Clas...

Page 8: ...and its own trimming potentiometer as listed in Table 1 To null the static offset voltage of the bridge complete the following steps 1 Connect the bridge configuration to the selected channel 2 Select...

Page 9: ...ile referring to Figures 3 through 5 where Vexc is the excitation voltage 3 3 V or 10 V Rd is either a completion resistor or a second strain gauge nominal resistance Rnull is the nulling resistor val...

Page 10: ...strain formula for a quarter bridge strain gauge configuration where Figure 3 Quarter Bridge Nulling Circuit 4Vr GF 1 2Vr Vr strained voltage static unstrained voltage Vexc CH CH CH EX EX R1 R2 4 5 k...

Page 11: ...on Guide Figure 4 Half Bridge Nulling Circuit CH CH CH EX EX R1 R2 4 5 k 4 5 k RSCAL 301 k RTrim 10 k RNull 39 1 k Screw Adjusts Potentiometer RL RL RL R4 gauge EX CH CH CH EX EX RTrim SCXI 1121 SCXI...

Page 12: ...L is engaged on a channel all the shunt switches of the channels are closed When SCAL is disengaged all the switches are open At startup or reset all switches are open by default You can control SCAL...

Page 13: ...ur application The sockets and corresponding channels are shown in Table 3 The factory installed RSCAL provided on the terminal block have a 301 k 1 value Assuming a quarter bridge strain gauge config...

Page 14: ...e number of samples to obtain the most accurate reading Noisy environments require averaging for greater accuracy You cannot use virtual channels to take the readings You can enable the CJC sensor in...

Page 15: ...CH3 is not available RTD and Thermistor Excitation By properly setting the excitation you can configure the SCXI 1321 on a per channel basis for RTD and thermistor measurements With the SCXI 1121 exci...

Page 16: ...ctory default setting Nulling circuit of Channel 2 is disabled W4 Nulling circuit of Channel 3 is enabled factory default setting Nulling circuit of Channel 3 is disabled Table 4 Jumper Settings of th...

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