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USER GUIDE

SCC-CI20 Current Input Module

USER GUIDESCC-CI20 Current Input Module

The SCC-CI20 converts current to voltage by passing it through a precision 
249

 resistor and sending the resulting voltage to the E Series DAQ device 

as a 0 to

+

5 V signal. The SCC-CI20 accepts up to two current sources at a 

maximum of 20 mA. A differential instrumentation amplifier buffers each 
input signal.

Conventions

The following conventions are used in this guide:

<>

Angle brackets that contain numbers separated by an ellipsis represent 
a range of values associated with a bit or signal name—for example, 
P1.<3..0>.

»

The 

»

 symbol leads you through nested menu items and dialog box options 

to a final action. The sequence 

File»Page Setup»Options

 directs you to 

pull down the 

File

 menu, select the 

Page Setup

 item, and select 

Options

 

from the last dialog box.

This icon denotes a note, which alerts you to important information.

This icon denotes a caution, which advises you of precautions to take to 
avoid injury, data loss, or a system crash.

 

When this symbol is marked on 

the product, refer to the 

Read Me First: Safety and Radio-Frequency 

Interference

 document, shipped with the product, for precautions to take.

When symbol is marked on a product, it denotes a warning advising you to 
take precautions to avoid electrical shock.

When symbol is marked on a product, it denotes a component that may be 
hot. Touching this component may result in bodily injury.

bold

Bold text denotes items that you must select in software, such as menu 
items and dialog box options. Bold text also denotes parameter names.

Содержание SCC-CI20

Страница 1: ...ion The sequence File Page Setup Options directs you to pull down the File menu select the Page Setup item and select Options from the last dialog box This icon denotes a note which alerts you to important information This icon denotes a caution which advises you of precautions to take to avoid injury data loss or a system crash When this symbol is marked on the product refer to the Read Me First ...

Страница 2: ...o both the SC 2345 connector block and configurable connector SCC SCC refers to any SCC Series signal conditioning module What You Need to Get Started To set up and use the SCC CI20 you need the following items SC 2345 2350 with one of the following SCC PWR01 SCC PWR02 and the PS01 power supply SCC PWR03 requires a 7 to 42 VDC power supply not included One or more SCC CI20 modules SC 2345 2350 Use...

Страница 3: ...o any socket J X 1 where X is 0 to 7 and connect the input signals to the module as described in the Connecting the Input Signals section If you use the SCC CI20 in a dual stage configuration you must use it as the first stage Plug the SCC CI20 into any socket J X 9 and plug the second stage SCC into socket J X 1 where X is 0 to 7 Connect the input signals to the SCC CI20 as described in the Conne...

Страница 4: ...acing the Input Resistors Incorrect connections can damage the input resistors and possibly other components of the module Spare 249 Ω resistors are available inside the SCC CI20 To open the SCC CI20 complete the following steps 1 Remove the screw from the back wide unlabeled side 2 Turn the front wide labeled side toward you 3 Place the screw terminal receptacle to the left 4 Slide the top cover ...

Страница 5: ...g the SC C120 when Scaling Voltage Measurements If you configured the SCC CI20 using Measurement Automation Explorer MAX and you are using NI DAQ the reading you get from the E Series DAQ device accounts for the voltage to current conversion and returns milliamps not volts Otherwise you must convert the raw voltage measurement to a current measurement To make this conversion use the following form...

Страница 6: ...e 0 05 Temperature coefficient of resistance 10 ppm C Maximum power dissipation 0 25 W Maximum input current 32 mA Output range 0 to 5 V Output slew rate 0 75 V µs min Gain error 0 1 max1 Temperature stability of gain error 0 006 C max Offset error 0 6 mV max1 Temperature stability of offset error 21 µV C max Dynamic Response Bandwidth 3 dB amplitude 4 mA 10 kHz Output slew rate 0 75 V µs min 1 Te...

Страница 7: ... O connectors One 20 pin right angle male connector one 4 pin screw terminal Wire gauge range 28 to 16 AWG Maximum Working Voltage Maximum working voltage refers to the signal voltage I 249 Ω plus the common mode voltage Channel to earth 15 V Installation Category I Channel to channel 15 V Installation Category I Environmental Operating temperature 0 to 50 C Storage temperature 20 to 70 C Humidity...

Страница 8: ... Emissions EN 55011 Class A at 10 m FCC Part 15A above 1 GHz Immunity EN 61326 1997 A2 2001 Table 1 CE C Tick and FCC Part 15 Class A Compliant Note For EMC compliance operate this device with shielded cabling CE Compliance This product meets the essential requirements of applicable European directives as amended for CE marking as follows Low Voltage Directive safety 73 23 EEC Electromagnetic Comp...

Страница 9: ...nnels of the E Series DAQ device AI GND is the analog input ground signal and is the reference for AI X and AI X 8 A GND is the reference for the 15V supplies AI GND and A GND connect to the SC 2345 at the SCC PWR connector Pins 17 to 20 accept signals from a first stage module if you are cascading two modules 1 Pin 1 2 Pin 2 3 PWB Key 4 Pin 19 5 Pin 20 Table 1 SCC CI20 Pin Signal Assignments Pin ...

Страница 10: ...uments products refer to the appropriate location Help Patents in your software the patents txt file on your CD or ni com patents 2001 2004 National Instruments Corp All rights reserved 371068B 01 Mar04 371068B 01 9 10 11 E Series A GND 12 13 15 V 14 15 V 15 16 17 AI X from first stage 18 AI X 8 from first stage 19 AI X from first stage 20 AI X 8 from first stage Table 1 SCC CI20 Pin Signal Assign...

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