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National Instruments Isolated Analog Input Modules SCC-AI01 User Manual Download Page 7

©

 National Instruments Corporation

7

SCC-AI Series Isolated Analog Input Modules

If a high common-mode voltage is present, connect the negative input pins, 
1 and 3, to the signal reference. Figure 1-5 shows a ground-referenced 
signal connection on one channel of the SCC-AI

XX

.

 

Figure 1-5.  

Ground-Referenced Signal Connection for the SCC-AI

XX

with High Common-Mode Voltage (One Channel)

Configuring the SCC System

Measurement & Automation Explorer (MAX) Configuration

Run MAX to configure the SCC system. Complete one of the following 
sets of steps depending on the version of NI-DAQ used in your application.

NI-DAQmx

Complete the following steps to configure the SCC-AI module using 
NI-DAQmx.

1.

Open 

Measurement & Automation 

Explorer.

2.

Right-click 

Devices and Interfaces 

and select 

Create New

.

3.

Under 

NI-DAQmx SCC Connector Block

 select 

SC-2345

. Click 

Finish

.

+

4

Lowpass

Filter

+

–

–

+

–

Lowpass

Filter

3

2

1

E Series DAQ Device

Signal

Source

ACH(

X 

)

SCC-AI

XX

AISENSE

AIGND

ACH(

X

+8)

High

CMV

+

–

Summary of Contents for Isolated Analog Input Modules SCC-AI01

Page 1: ...cy SCC AIXX modules are available in a range of gains from 0 2 to 200 They contain lowpass filters of either 10 kHz or 4 Hz bandwidth Table 1 1 gives the gain and bandwidth for each module Table 1 1 SCC AIXX Module Input Output Range Gain and Bandwidth Model Input Range Output Range Gain Bandwidth SCC AI01 42 V 8 4 V 0 2 10 kHz SCC AI02 20 V 10 V 0 5 10 kHz SCC AI03 10 V 10 V 1 10 kHz SCC AI04 5 V...

Page 2: ...xt denotes items that you must select in the software such as menu items and dialog box options Bold text also denotes parameter names italic Italic text denotes variables emphasis a cross reference or an introduction to a key concept This font also denotes text that is a placeholder for a word or value that you must supply monospace Text in this font denotes text or characters that you should ent...

Page 3: ...tage Measurements section Unpacking the Module SCC modules are shipped in antistatic envelopes to prevent electrostatic damage ESD to the modules ESD can damage several components on these products Caution Never touch the exposed pins of connectors To avoid damage from ESD when you handle the module take the following precautions Ground yourself by using a grounding strap or by touching a grounded...

Page 4: ...ket 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 AIXX in a dual stage configuration the SCC AIXX must be the first stage module Plug it 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 AIXX as described in the Connecting the ...

Page 5: ...minals 4 Tighten the screws to 0 5 to 0 6 N m 4 4 to 5 3 lb in of torque Each screw terminal is labeled by pin number 1 4 Pins 1 and 2 form a channel routed to E Series DAQ device channel X 8 and pins 3 and 4 form a channel routed to the E Series DAQ device channel X where X is 0 to 7 depending on the socket where you plug in the module The SCC AIXX provides channel to ground and module to module ...

Page 6: ...SC 2345 terminal block through a 10 kΩ to 100 kΩ resistor Figure 1 4 shows a floating signal connection on one channel of the SCC AIXX Figure 1 4 Nonreferenced Signal Connection for the SCC AIXX One Channel 4 Lowpass Filter Lowpass Filter 3 2 1 E Series DAQ Device Signal Source ACH X SCC AIXX AISENSE AIGND ACH X 8 4 Lowpass Filter Lowpass Filter 3 2 1 E Series DAQ Device Signal Source ACH X SCC AI...

Page 7: ...onfiguring the SCC System Measurement Automation Explorer MAX Configuration Run MAX to configure the SCC system Complete one of the following sets of steps depending on the version of NI DAQ used in your application NI DAQmx Complete the following steps to configure the SCC AI module using NI DAQmx 1 Open Measurement Automation Explorer 2 Right click Devices and Interfaces and select Create New 3 ...

Page 8: ...ave the current version of NI DAQ download it from ni com f Click OK after completing all SCC entries to complete the configuration process 5 Close MAX Note Configuring the SCC system using MAX automatically sets the E Series DAQ device analog input mode to nonreferenced single ended NRSE Traditional NI DAQ Complete the following steps to configure the SCC AI module using Traditional NI DAQ 1 Open...

Page 9: ...en Measurement Automation Explorer 2 Right click Data Neighborhood and select Create New 3 Select NI DAQmx Task or NI DAQmx Global Channel and click Next 4 Select Analog Input and then select Voltage 5 If you are creating a task select the channels to add to the task You can select blocks of channels by pressing the Shift key while making the selections or select individual channels by pressing th...

Page 10: ...Right click Data Neighborhood and select Create New 3 Select Traditional NI DAQ Virtual Channel and click Finish 4 Click Next to select Analog Input as the type of channel to configure 5 Select Voltage from the drop down list and click Next 6 Enter the rest of the values as they apply to your setup and click Next 7 On the next screen specify information about the E Series DAQ device being used and...

Page 11: ...l at 25 C unless otherwise stated Input Characteristics Number of input channels 2 NRSE Isolation Bank isolation isolation per module 1 Input output signal range gain and bandwidth Refer to Table 1 1 Input impedance SCC AI01 SCC AI02 1 MΩ All others 100 MΩ Gain error 4 5 max trimmable to zero Gain stability 150 PPM C Offset error 40 mV max RTI2 Offset stability 225 µV C Nonlinearity 0 0128 typ 0 0...

Page 12: ... in by 0 73 in I O connectors One 20 pin right angle male connector one 4 pin screw terminal removable Screw terminal wire gauge 24 to 12 AWG Maximum Working Voltage Maximum working voltage refers to the signal voltage plus the common mode voltage Channel to earth 300 V Installation Category II Module to module 300 V Installation Category II Channel to channel Not isolated1 1 The SCC AIXX does not...

Page 13: ...product line and click the appropriate link in the Certification column Electromagnetic Compatibility Emissions EN 55011 Class A at 10 m FCC Part 15A above 1 GHz Immunity Evaluated to EN 61326 1997 A2 2001 Table 1 CE C Tick and FCC Part 15 Class A Compliant Note For full EMC compliance you must operate this device with shielded cabling In addition all covers and filler panels must be installed CE ...

Page 14: ...eries DAQ device so that its input range is 10 V 3 Connect the voltage source to the screw terminals of the desired channel on the SCC AIXX 4 Apply the voltage given in Table 1 3 that corresponds to the SCC AIXX module For example if you have an SCC AI03 you must apply 8 VDC 5 Using your software have the E Series DAQ device read the desired channel on the SCC AIXX and record the value 6 Input 0 V...

Page 15: ...ing a difference of 8 06 V Because this difference is not equal to 8 V you must adjust the gain trimpot and repeat the procedure until the difference in outputs equals 8 V Note In this example there can be an offset voltage such that the final readings are 8 01 V and 0 01 V for a difference of 8 V The gain trimpot adjusted in step 9 of the previous procedure adjusts only for gain errors and does n...

Page 16: ... are the analog input channels of the E Series DAQ device AIGND is the analog input ground signal and is the reference for ACH X and ACH X 8 AGND is the reference for the 15 V supplies and REF5V AIGND and AGND connect to the SC 2345 at the SCC PWR connector GND is the reference for the 5 V supply 1 Pin 1 2 Pin 2 3 PWB Key 4 Pin 19 5 Pin 20 Table 1 4 SCC AIXX Module Pin Assignments Pin Number Signa...

Page 17: ...nal Instruments Corporation 17 SCC AI Series Isolated Analog Input Modules 9 6 V 10 GND 11 AGND 12 REF5V 13 15 V 14 15 V 15 16 17 18 19 20 Table 1 4 SCC AIXX Module Pin Assignments Continued Pin Number Signal ...

Page 18: ...ntioned herein are trademarks or trade names of their respective companies For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD or ni com patents 2002 2003 National Instruments Corp All rights reserved 371066A 01 Sep03 371066A 01 ...

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