NATIONAL INSTRUMENTS SCXI-1102 Channel Thermocouple Amplifier Module Instruction Manual

: June 1, 2024
: NATIONAL INSTRUMENTS

Table of Contents

SCXI-1102 Channel Thermocouple Amplifier Module
Specifications:
Product Usage Instructions:
Software Requirement:
Calibration Process:
Documentation:
Calibration Interval:
Test Equipment:
- Frequently Asked Questions (FAQ):
What is the default password for password-protected

SCXI-1102 Channel Thermocouple Amplifier Module

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Specifications:

Product: SCXI-1102/B/C Signal Conditioning Module
Driver Requirement: NI-DAQmx driver
Supported Programming Languages: LabVIEW, LabWindows/CVI,
C/C++, C#, Visual Basic .NET
Calibration Interval: Recommended at least once a year
Default Password for Operations: NI
Test Equipment Recommendations:
- Calibrator: Fluke 5700A
- DAQ Device: NI 6281
- DMM: NI 4070
- Terminal Block: SCXI-1300

Product Usage Instructions:

Software Requirement:

The SCXI-1102/B/C calibration procedure requires the NI-DAQmx
driver. Ensure you have the latest driver compatible with your
development environment.

Calibration Process:

Initial Setup: Configure the SCXI-1102/B/C for
calibration.
Verification Procedure: Verify the existing
operation of the SCXI-1102/B/C to ensure it is operating within
test limits.
Adjustment Procedure: Perform an external
calibration that adjusts the SCXI-1102/B/C calibration constants
with respect to a known voltage source.

Documentation:

For more detailed information on the SCXI-1102/B/C, refer to the
SCXI-1102/B/C User Manual. Installation and configuration guidance
can be found in the SCXI Quick Start Guide.

Calibration Interval:

Calibrate the SCXI-1102/B/C at least once a year. Adjust this
interval based on the accuracy requirements of your
application.

Test Equipment:

Refer to Table 1 for recommended test equipment. Follow
guidelines to optimize connections and environment during
calibration.

Frequently Asked Questions (FAQ):

What is the default password for password-protected

operations?

The default password for password-protected operations is
“NI”.

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SCXI-1349

CALIBRATION PROCEDURE
SCXITM-1102/B/C

For NI-DAQmx

This document contains information and instructions for calibrating the National Instruments SCXI-1102/B/C signal conditioning module.

Contents

Conventions ……………………………………………………………………………….. 2 Software …………………………………………………………………………………….. 2 Documentation ……………………………………………………………………………. 3 Calibration Interval ……………………………………………………………………… 3 Password ……………………………………………………………………………………. 3 Test Equipment …………………………………………………………………………… 4 Test Conditions …………………………………………………………………………… 4 Calibration Process ……………………………………………………………………… 5
Initial Setup………………………………………………………………………….. 5 Verification Procedure …………………………………………………………… 7 Adjustment Procedure……………………………………………………………. 12 Verifying Adjusted Values …………………………………………………….. 14 Test Limits …………………………………………………………………………………. 14 Gain and Offset …………………………………………………………………….. 15 SCXI-1102/B/C Front and Rear Panel Diagrams …………………………….. 15 World Wide Support and Services…………………………………………………. 18

Conventions

»
bold italic monospace monospace italic

The following conventions are used in this document:
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.
Bold text denotes items that you must select or click in the software, such as menu items and dialog box options. Bold text also denotes parameter names.
Italic text denotes variables, emphasis, a cross-reference, or an introduction to a key concept. Italic text also denotes text that is a placeholder for a word or value that you must supply.
Text in this font denotes text or characters that you should enter from the keyboard, sections of code, programming examples, and syntax examples. This font is also used for the proper names of disk drives, paths, directories, programs, subprograms, subroutines, device names, functions, operations, variables, filenames, and extensions.
Italic text in this font denotes text that is a placeholder for a word or value that you must supply.

Software

The SCXI-1102/B/C calibration procedure requires the NI-DAQmx driver. NI recommends using the latest driver that supports both your development environment and the SCXI-1102/B/C. NI-DAQmx includes high-level function calls to simplify the task of writing software to calibrate devices. NI-DAQmx supports many programming languages, including LabVIEW, LabWindowsTM/CVITM, C/C++, C#, and Visual Basic .NET.

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Documentation
The following documents are the primary references for writing your calibration utility: · The NI-DAQmx Help includes information about creating applications
that use NI-DAQmx. · The NI-DAQmx C Reference Help includes information about the
functions in NI-DAQmx. · The DAQ Getting Started guides include information about installing
and configuring NI-DAQmx devices.
You can access these documents by selecting Start»All Programs»National Instruments»NI-DAQmx after installing NI-DAQmx.
For more information about the SCXI-1102/B/C, refer to the SCXI-1102/B/C User Manual. For information about installing and configuring SCXI modules, refer to the SCXI Quick Start Guide.
Calibration Interval
Calibrate the SCXI-1102/B/C at a regular interval as defined by the measurement accuracy requirements of your application. NI recommends that you perform a complete calibration at least once every year. You can shorten this interval based on the accuracy requirements of your application.
Password
The default password for password-protected operations is NI.

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SCXI-1102/B/C Calibration Procedure

Test Equipment

NI recommends that you use the equipment in Table 1 to calibrate the SCXI-1102/B/C. If these instruments are not available, use the requirements listed in Table 1 to select a suitable substitute.

Table 1. Test Equipment

Equipment Calibrator DAQ Device DMM Terminal Block

Recommended Model
Fluke 5700A NI 6281 NI 4070
SCXI-1300

Requirements 50 ppm
16-bit minimum 6 1/2 digit, 15 ppm
—

Test Conditions

Follow these guidelines to optimize the connections and the environment during calibration:
· Keep connections to the SCXI-1102/B/C as short as possible. Long cables and wires can act as antennas, picking up extra noise and thermal offsets that affect measurements.
· Use shielded copper wire for all cable connections to the SCXI-1102/B/C. Use twisted-pair wire to eliminate noise and thermal offsets.
· Maintain the ambient temperature between 18 °C and 28 °C.
· Keep relative humidity below 80%.
· Allow a warm-up time of at least 15 minutes for the SCXI-1102/B/C and 30 minutes for the DAQ device to ensure that the measurement circuitry is at a stable operating temperature.

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Calibration Process

The calibration process has the following steps:
1. Initial Setup–Configure the SCXI-1102/B/C for calibration.
2. Verification Procedure–Verify the existing operation of the SCXI-1102/B/C. This step determines whether the SCXI-1102/B/C is operating within its test limits.
3. Adjustment Procedure–Perform an external calibration that adjusts the SCXI-1102/B/C calibration constants with respect to a known voltage source.
4. Verifying Adjusted Values–Perform another verification to ensure that the SCXI-1102/B/C is operating within its test limits after adjustments.

Initial Setup

Complete the following steps to configure the SCXI-1102/B/C for calibration:
1. Make sure that all the appropriate driver and application software is installed.
2. Make sure all components involved in the calibration procedure are powered off.
3. Assemble the SCXI-1102/B/C, SCXI chassis, terminal blocks, and DAQ device as shown in Figure 1. You must cable the SCXI-1102/B/C directly to the DAQ device.

5

SCXI-1102/B/C Calibration Procedure

3

2

1

SCXI

1100

®
5 4 3 2 1
8
9

ADDRESS

5 4
6

7

2 4 6 8 10 12 14716911812103210521472169228132033225324732693381430343254347436944815403 45 47 49 5
3 1

12

11 10

1 SCXI-1300 Terminal Block 2 SCXI-1102/B/C Module 3 SCXI Chassis 4 SCXI-1349 Cable Adapter 5 Shielded 68-Pin Cable 6 NB1 Cable (50-Pin Ribbon Cable)

7 TBX 50-Pin Terminal Block 8 Cable to DMM 9 Cable to Calibrator 10 Calibrator 11 DMM 12 DAQ Device
Figure 1. Calibration Connections

4. Power on the SCXI chassis and the external computer.
5. You must configure the hardware properly with Measurement & Automation Explorer (MAX). Refer to the SCXI Quick Start Guide for details about configuring the SCXI chassis.

Note When you configure a device in MAX, the device is assigned a device identifier. In this calibration document, the functions used for demonstrating the calibration process use the device identifiers Dev1 for the DAQ device and SC1Mod1 for the SCXI-1102/B/C.

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Verification Procedure
The verification procedure determines how well the SCXI-1102/B/C is meeting its test limits. You can use this information to select the appropriate calibration interval for your application.
The SCXI-1102/B/C stores gain and offset calibration constants for each gain setting per analog input channel. A complete verification of the inputs involves measuring the accuracy at all possible gain settings on all channels of the SCXI-1102/B/C.
To view the calibration VIs in LabVIEW, select Measurement I/O»DAQmx – Data Acquisition»DAQmx Advanced»DAQmx Calibration on the Functions palette. You can also use the Search button, shown in Figure 2, to look for a specific VI.

Figure 2. DAQmx Calibration Palette and the Search Button

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SCXI-1102/B/C Calibration Procedure

Complete the following steps to verify the accuracy of each SCXI-1102/B/C analog input channel:
1. Use the DAQmx Self Calibrate VI to verify the DAQ device. This VI measures the onboard reference voltage of the DAQ device and adjusts the self- calibration constants to account for any errors caused by short-term fluctuations in the operating environment.
Note Throughout the verification procedure, refer to the function call parameters for the LabVIEW input values.

LabVIEW Block Diagram

NI-DAQmx Function Call
Call DAQmxSelfCal with the following parameter: Device_Name: “Dev1”

2. Connect the calibrator output to pins AI and AI+ for all channels. Refer to the SCXI-1300/1301 Terminal Block Installation Guide for connection instructions. If you are not using the recommended SCXI-1300, refer to Table 8 for the front signal pin assignments of the SCXI-1102/B/C. If the calibration signal source is floating, connect AI to the SCXI chassis ground using the ground lug available on the SCXI terminal block.
3. Set the calibrator voltage to the desired test point indicated in Tables 6 or 7.
4. Create a task using DAQmxCreateTask.

LabVIEW Block Diagram
LabVIEW does not require this step.

NI-DAQmx Function Call
Call DAQmxCreateTask with the following parameters: taskName: “AIVerificationTask” taskHandle: &taskHandle

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5. Add a voltage channel using the DAQmx Create Virtual Channel VI.

LabVIEW Block Diagram

NI-DAQmx Function Call Call DAQmxCreateAIVoltageChan with the following parameters: taskHandle: taskHandle physicalChannel: “SC1Mod1/aiX” nameToAssignToChannel: “myVoltageChannel” terminalConfig: DAQmx_Val_Cfg_Default minVal: -10 V maxVal: 10 V units: DAQmx_Val_Volts customScaleName: “” Where X refers to the channel you are verifying.

6. Set the gain value to 1 or 100 using the DAQmx Channel Property Node. You can find the AI.Gain property by selecting Analog Input»General Properties»Advanced»Gain. Use the gain setting that corresponds to the current test point.

LabVIEW Block Diagram

NI-DAQmx Function Call
Call DAQmxSetAIGain with the following parameters: taskHandle: taskHandle Channel: “” Data: (gain value for particular test point) float64

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SCXI-1102/B/C Calibration Procedure

7. Configure timing for the voltage acquisition using the DAQmx Timing VI.

LabVIEW Block Diagram

NI-DAQmx Function Call Call DAQmxCfgSampClkTiming with the following parameters: taskHandle: taskHandle source: “” rate: 1000.0 activeEdge: DAQmx_Val_Rising sampleMode: DAQmx_Val_FiniteSamps sampsPerChan: 1000

8. Commit the verification changes using the DAQmx Control Task VI.

LabVIEW Block Diagram

NI-DAQmx Function Call
Call DAQmxTaskControl with the following parameters: taskHandle: taskHandle action: DAQmx_Val_Task_Commit

9. For each new test point, use the Time Delay Express VI to account for the settling time of the SCXI-1102/B/C. Refer to Table 2 for the settling time of the SCXI-1102/B/C.

Table 2. Settling Time of the SCXI-1102/B/C

SCXI-1102 3 minutes (first test point) 1 minute (all other test points)

SCXI-1102B, SCXI-1102C 5 second

LabVIEW Block Diagram

Function Call
Call a sleep or wait function to suspend execution for the necessary settling time listed in Table 2.

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10. Acquire 1000 points of voltage data using the Analog 1D DBL 1Chan NSamp instance of the DAQmx Read VI.

LabVIEW Block Diagram

NI-DAQmx Function Call Call DAQmxReadAnalogF64 with the following parameters: taskHandle: taskHandle numSampsPerChan: 1 timeout: 10.0 fillMode: DAQmx_Val_GroupByChannel readArray: data arraySizeInSamples: 1000 sampsPerChanRead: &read reserved: NULL

11. Compute the mean of the 1000 voltage values that you acquired.
12. Compare the resulting average to the upper and lower limits listed in Tables 6 or 7. If the result is between the upper and lower limits, the SCXI-1102/B/C passes the test.
13. Clear the acquisition using the DAQmx Clear Task VI.

LabVIEW Block Diagram

NI-DAQmx Function Call
Call DAQmxClearTask with the following parameter: taskHandle: taskHandle

14. Repeat steps 4 through 13 for the remaining channels. 15. Repeat steps 3 through 14 for all test points in Tables 6 or 7.
You have finished verifying the analog input accuracy of the SCXI-1102/B/C.

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SCXI-1102/B/C Calibration Procedure

Adjustment Procedure
The adjustment procedure adjusts the gain and offset calibration constants on the SCXI-1102/B/C. Complete the Verification Procedure prior to the adjustment procedure to determine the pre-calibration accuracy and whether adjustments are necessary.
Complete the following steps to adjust the gain and offset of the SCXI-1102/B/C: 1. Connect the calibrator output pins AI- and AI+ for all channels. Refer
to the SCXI-1300/1301 Terminal Block Installation Guide for connection instructions. If you are not using the recommended SCXI-1300, refer to Table 8 for the front signal pin assignments of the SCXI-1102/B/C. If the calibration signal source is floating, connect AI- to the SCXI chassis ground using the ground lug available on the SCXI terminal block. 2. Connect the DMM to CH 0+ and CH 0- (pin 3 and 4) on the rear connector. Refer to Table 9 for the rear signal pin assignments of the SCXI-1102/B/C.
Note You can access these pins using a 50-pin cable connected to an SCXI-1349.
3. Start an external calibration session using the DAQmx Initialize External Calibration VI.
Note Throughout the adjustment procedure, refer to the function call parameters for the LabVIEW input values.

LabVIEW Block Diagram

NI-DAQmx Function Call
Call DAQmxInitExtCal with the following parameters: deviceName: “SC1Mod1” password: “NI” calHandle: &calHandle

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4. Set the SCXI-1102/B/C to a gain value of 1 or 100 using the DAQmx Setup SCXI Calibration VI.

LabVIEW Block Diagram

NI-DAQmx Function Call
Call DAQmxSetup1102Cal with the following parameters: calHandle: calHandle channelNames: “SC1Mod1/aiX” gain: 1 or 100 Where X refers to the channel you are calibrating.

5. Set the calibrator to the desired voltage for the gain value you set in the previous step. Refer to Table 3 or 4 for appropriate voltage set points.

Table 3. SCXI-1102 Voltage Set Points

Gain

Set Points (V)

1

9

6

2

0

2

6

9

100 0.09 0.06 0.02 0.00 0.02 0.06 0.09

Table 4. SCXI-1102 B and SCXI-1102 C Voltage Set Points

Gain

Set Points (V)

1

9

6

3

0

3

6

9

100 0.09 0.06 0.03 0.00 0.03 0.06 0.09

6. Wait for the settling time to elapse and then record the measured output from the DMM. Refer to Table 5 for the settling time of the SCXI-1102/B/C.

Table 5. Settling Time of the SCXI-1102/B/C

SCXI-1102

SCXI-1102B, SCXI-1102C

60 seconds

5 second

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SCXI-1102/B/C Calibration Procedure

7. Adjust the external calibration constants using the DAQmx Adjust SCXI Calibration VI.

LabVIEW Block Diagram

NI-DAQmx Function Call
Call DAQmxAdjust1102Cal with the following parameters:
calHandle: calHandle
refVoltage: (calibrator output voltage) float64
measOutput: (voltage measured by DMM) float64

8. Repeat steps 5 through 7 for the seven voltage test points at the current gain value in Table 3 or 4.
9. Commit the calibration changes you made in the session using the DAQmx Close External Calibration VI. The data is written to the hardware in this step.

LabVIEW Block Diagram

NI-DAQmx Function Call
Call DAQmxCloseExtCal with the following parameters: calHandle: calHandle action: DAQmx_Val_Action_Commit

10. Repeat steps 3 through 9 for both gain values in Table 3. 11. Repeat steps 1 through 10 for the remaining channels.
You have finished adjusting the gain and offset of the SCXI-1102/B/C.
Verifying Adjusted Values
After calibrating the SCXI-1102/B/C, NI recommends that you verify the analog input operation by repeating the steps listed in the Verification Procedure to ensure that the SCXI-1102/B/C is operating within its test limits.
Test Limits
Refer to the SCXI-1102/B/C User Manual for the specifications of the SCXI-1102/B/C.

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Gain and Offset

Table 6 contains the test limits to use when verifying and adjusting the gain and offset of the SCXI-1102 and SCXI-1102B. Table 7 contains the test limits to use when verifying and adjusting the gain and offset of the SCXI-1102C. If the SCXI-1102/B/C was calibrated within the last year, the test point value should fall between the Lower Limit and Upper Limit values found in Tables 6 or 7.

Note The values in Tables 6 and 7 do not include DAQ device errors.

Gain 1
100

Table 6. SCXI-1102 and SCXI-1102 B Test Limits

Test Point (V) Upper Limit (V) Lower Limit (V)

9.800000

9.80345

9.79655

0.000000

0.001002

-0.001002

9.800000

9.79655

9.80345

0.098000

0.098060

0.097940

0.000000

0.000030

0.098000

0.097940

0.098060

Gain 1
100

Table 7. SCXI-1102 C Test Limits

Test Point (V) Upper Limit (V) Lower Limit (V)

9.800000

9.80345

9.79655

0.000000

0.001002

-0.001002

9.800000

9.79655

9.80345

0.098000

0.098060

0.097940

0.000000

0.000030

0.098000

0.097940

0.098060

SCXI-1102/B/C Front and Rear Panel Diagrams

Table 8 shows the pin assignments for the SCXI-1102/B/C front panel connector. Table 9 shows the pin assignments for the SCXI-1102/B/C rear signal connector.

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SCXI-1102/B/C Calibration Procedure

Front Connector Diagram
Column A B C
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9 8 7 6 5 4 3 2 1
NC–No Connection

Table 8. Front Signal Pin Assignments

Pin Number 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Column A CH GND
NC NC NC NC NC NC NC CH GND NC NC NC NC NC NC NC CH GND NC NC NC NC NC NC NC NC NC NC CH GND CJ SENSOR CJ SENSOR CH GND +5 V

Column B AI 0 AI 1 AI 2 AI 3 AI 4 AI 5 AI 6 AI 7 AI 8 AI 9 AI 10 AI 11 AI 12 AI 13 AI 14 AI 15 AI 16 AI 17 AI 18 AI 19 AI 20 AI 21 AI 22 AI 23 AI 24 AI 25 AI 26 AI 27 AI 28 AI 29 AI 30 AI 31

Column C AI 0+ AI 1+ AI 2+ AI 3+ AI 4+ AI 5+ AI 6+ AI 7+ AI 8+ AI 9+ AI 10+ AI 11+ AI 12+ AI 13+ AI 14+ AI 15+ AI 16+ AI 17+ AI 18+ AI 19+ AI 20+ AI 21+ AI 22+ AI 23+ AI 24+ AI 25+ AI 26+ AI 27+ AI 28+ AI 29+ AI 30+ AI 31+

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Rear Connector Diagram
12 34 56 78 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
NC–No Connection
RSVD–Reserved

Table 9. Rear Signal Pin Assignments

Signal Name AI GND CH 0+ NC NC NC NC NC NC NC OUT REF NC NC
SER DAT IN DAQ D/A SLOT 0 SEL
D GND NC NC
SER CLK NC NC
RSVD NC NC NC

Pin Number 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49

Pin Number 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

Signal Name AI GND CH 0 NC NC NC NC NC NC NC NC NC D GND
SER DAT OUT NC NC NC NC
AI HOLD COMP, AI HOLD NC NC NC NC
RSVD NC NC

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SCXI-1102/B/C Calibration Procedure

World Wide Support and Services
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