National Instruments Isolated Analog Input Modules SCC-AI01 User Manual
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National Instruments Isolated Analog Input Modules SCC-AI01 User Manual

National Instruments Isolated Analog Input Modules SCC-AI01 User Manual

Scc-ai series isolated analog input modules
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USER GUIDE

SCC-AI Series Isolated Analog
Input Modules
The SCC-AI Series isolated analog input modules (SCC-AIXX) can extract
a relatively low-amplitude input signal from a high-common-mode voltage
so the E Series DAQ device can measure the input signal. They also can
amplify and filter the input signal, resulting in higher measurement
resolution and accuracy.
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
±42 V
SCC-AI01
±20 V
SCC-AI02
±10 V
SCC-AI03
±5 V
SCC-AI04
±1 V
SCC-AI05
±100 mV
SCC-AI06
±50 mV
SCC-AI07
±10 V
SCC-AI13
±5 V
SCC-AI14
Output Range
Gain
±8.4 V
0.2
±10 V
0.5
±10 V
1
±10 V
2
±10 V
10
±10 V
100
±10 V
200
±10 V
1
±10 V
2
Bandwidth
10 kHz
10 kHz
10 kHz
10 kHz
10 kHz
10 kHz
10 kHz
4 Hz
4 Hz

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Summary of Contents for National Instruments Isolated Analog Input Modules SCC-AI01

  • Page 1: User Guide

    USER GUIDE SCC-AI Series Isolated Analog Input Modules The SCC-AI Series isolated analog input modules (SCC-AIXX) can extract a relatively low-amplitude input signal from a high-common-mode voltage so the E Series DAQ device can measure the input signal. They also can amplify and filter the input signal, resulting in higher measurement resolution and accuracy.

  • Page 2: What You Need To Get Started

    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, ai<0..7>. 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.

  • Page 3: Unpacking The Module

    Notify NI if the module appears damaged in any way. Do not install a damaged module. Store the module in the antistatic envelope when it is not in use. © National Instruments Corporation One or more SCC-SGXX SCC-SG Series Strain-Gauge Modules User Guide...

  • Page 4: Installing The Module

    Installing the Module Refer to the Read Me First: Safety and Radio-Frequency Interference document Caution before removing equipment covers or connecting/disconnecting any signal wires A blue label stripe identifies the SCC-AIXX as an analog input module. The label also displays the icon shown in Figure 1-1. You can plug the SCC-AIXX into any analog input socket on the SC-2345.

  • Page 5: Connecting The Input Signals

    1 and 3 are connected together internally. Figure 1-3 shows the SCC-AIXX signal connections. © National Instruments Corporation Figure 1-2. SCC-AIXX Two-Part Screw-Terminal System Remove power from the signal lines. Strip 7 mm of insulation from the ends of the signal wires.
  • Page 6 SCC-AI XX Signal Source – – The inputs are designed in a floating (nonreferenced) single-ended configuration. If the measured signals are floating, connect the negative input pins, 1 and 3, to AISENSE on the 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.
  • Page 7 NI-DAQ used in your application. NI-DAQmx Complete the following steps to configure the SCC-AI module using NI-DAQmx. © National Instruments Corporation – – Figure 1-5. Ground-Referenced Signal Connection for the SCC-AIXX with High Common-Mode Voltage (One Channel) Open Measurement &...
  • Page 8 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. SCC-AI Series Isolated Analog Input Modules In the SCC Connector Block Configuration window, configure the SCC system as follows: Specify the SCC Carrier Type.
  • Page 9 Creating an NI-DAQmx Task or Global Channel To create an NI-DAQmx task or global channel, complete the following steps. © National Instruments Corporation Open Measurement & Automation Explorer. Right-click Data Neighborhood and select Create New. Select NI-DAQmx Task or NI-DAQmx Global Channel and click Next.
  • Page 10 Table 1-2 shows suggested values for some of the parameters. Use default values for parameters not shown. You have finished configuring the NI-DAQmx task or global channel. Creating a Virtual Channel in Traditional NI-DAQ To create a Traditional NI-DAQ virtual channel, complete the following steps.

  • Page 11: Scaling Voltage Measurements

    The SCC-AIXX does not provide isolation between the two channels of the module. For more information on this topic, refer to the Connecting the Input Signals This specification is calculated relative to the input range of the module. © National Instruments Corporation SCC-AI01, SCC-AI02 ... 1 MΩ All others... 100 MΩ section.

  • Page 12: Filter Characteristics

    Filter Characteristics Number of poles ...3 Rolloff...60 dB/decade Cutoff frequency (–3 dB) Power Requirement Analog power ...519 mW max Digital power (+5 V) ...625 mW max Physical Dimensions ...8.89 cm by 2.92 cm by 1.85 cm I/O connectors...One, 20-pin right-angle Screw terminal wire gauge ...24 to 12 AWG Maximum Working Voltage Maximum working voltage refers to the signal voltage plus the...

  • Page 13: Electromagnetic Compatibility

    Note regulatory compliance information. To obtain the DoC for this product, visit ni.com/hardref.nsf appropriate link in the Certification column. © National Instruments Corporation IEC 61010-1, EN 61010-1 UL 3111-1, UL 61010B-1 CAN/CSA C22.2 No. 1010.1 , search by model number or product line, and click the...
  • Page 14 Calibrating Gain and Offset Errors The SCC-AIXX is calibrated at the factory before shipment. If you want to adjust the gain of the SCC-AIXX in your system using your E Series DAQ device, you need a voltage source that is several times more accurate than the SCC itself and capable of providing the DC voltage shown in Table 1-3.
  • Page 15 Complete the following steps to adjust the offset voltage of the SCC-AIXX. © National Instruments Corporation Adjust the trimpot labeled Gain located on the top of the SCC-AIXX.
  • Page 16 SCC-AIXX Module Pin Assignments Figure 1-6 shows the I/O connector pins on the bottom of the module. 1 Pin 1 Pin 2 Table 1-4 lists the signal corresponding to each I/O connector pin on the bottom of the SCC-AIXX. ACH(X) and ACH(X+8) are the analog input channels of the E Series DAQ device.
  • Page 17 © National Instruments Corporation Table 1-4. SCC-AIXX Module Pin Assignments (Continued) Pin Number SCC-AI Series Isolated Analog Input Modules Signal +6 V AGND REF5V +15 V –15 V — — — — — —...
  • Page 18 *371066A-01* Corporation. Product and company names mentioned 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.

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