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 National Instruments Corporation

7

SCXI-1321 Terminal Block Installation Guide

Environmental

Operating temperature............................ 0 to 50 °C

Storage temperature ............................... –20 to 70 °C

Humidity ................................................ 10 to 90% RH, noncondensing

Maximum altitude .................................. 2,000 meters

Pollution Degree (indoor use only) ........ 2

Safety

The SCXI-1321 is designed to meet the requirements of the following 
standards of safety for electrical equipment for measurement, control and 
laboratory use:

IEC 61010-1, 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 Class A at 10 meters; 

FCC Part 15A above 1 GHz

Immunity ................................................ EN 61326:1997 + A2:2001, 

Table 1

EMC/EMI............................................... CE, C-Tick and FCC Part 15 

(Class A) Compliant

Note 

For EMC compliance, operate this device with shielded cabling.

CE Compliance

The SCXI-1321 meets the essential requirements of applicable European 
Directives, as amended for CE Marking, as follows:

Low-Voltage Directive (safety) ............. 73/23/EEC

Electromagnetic Compatibility Directive (EMC)89/336/EEC

Содержание SCXI-1321

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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