NATIONAL INSTRUMENTS SCXI -1100 Modules User Guide

NATIONAL INSTRUMENTS SCXI -1100 Modules

Product Information

Specifications

• Model: SCXI-1100
• Manufacturer: National Instruments
• Compatibility: SCXI chassis, E Series DAQ device

Product Usage Instructions

Equipment and Test Requirements
The SCXI-1100 calibration procedure requires the following equipment:

• High-precision voltage source with at least 50 ppm accuracy
• E Series data acquisition (DAQ) device
• SCXI-1349 adapter

Software and Documentation
Software and documentation needed:

• NI-DAQ software (current version)
• Documentation available at ni.com/manuals

Setting Up the Module

1. Install the SCXI-1100 in slot 1 of the SCXI chassis.
2. Connect a 68-to-68-pin cable between the SCXI-1100 module and the E Series DAQ device using an SCXI-1349 cable adapter.
3. Configure the hardware with Measurement & Automation Explorer (MAX).
4. Set all jumpers to their factory-default settings as per Table 1.

Verification Procedures
The SCXI-1100 does not store user-adjustable calibration constants, so verification of the module’s performance isessential.

FAQ (Frequently Asked Questions)

• Q: What if I do not have the exact test equipment mentioned?
  A: If the specified equipment is not available, you can use substitute calibration standards that meet the accuracy requirements provided.

• Q: Can I use an SCXI-1308 terminal block for connection?
  A: No, using an SCXI-1308 terminal block is not recommended as it may lead to false failures due to current sensing resistors.

Equipment and Other Test Requirements

This section describes the equipment, software, documentation, and test conditions required for verifying the performance of the SCXI-1100.

Test Equipment
Verification requires a high-precision voltage source with at least 50 ppm accuracy and an E Series data acquisition (DAQ) device. NI recommends you use the following instruments for verifying the performance of the SCXI-1100:

• Calibrator—Fluke 5700A
• National Instruments E Series DAQ device

If these instruments are not available, use the accuracy requirements listed above to select a substitute calibration standard.

Notes If you do not have custom connection hardware, you need a connector block such as the National Instruments SCXI-1300, a shielded 68-pin connector cable, and an SCXI-1349 adapter. These components give easy access to the individual pins on the SCXI-1100 front and rear connectors.
Do not use an SCXI-1308 terminal block as the current sensing resistors causes false failures.

Software and Documentation
This section describes the software and documentation required for verifying the performance of the SCXI-1100 module.

• Software
  The only software required for this verification procedure is the current version of NI-DAQ, which contains the required calibration functions.
  Documentation
  This calibration document contains all the information you need to complete the verification procedure. If you want more information about the product, refer to the SCXI-1100 User Manual, which you can download from ni.com/manuals. If you need more information about the calibration functions, refer to the NI-DAQ Function Reference Help, which you can find by selecting Start»Programs»National Instruments» NI-DAQ»NI-DAQ Help»NI-DAQ Function Reference Help.

Test Conditions
Follow these guidelines to optimize the connection and the environment during verification.

• Keep connections to the SCXI module as short as possible. Long cables and wires act as antennae, picking up extra noise that can affect measurements.
• Use shielded copper wire for all cable connections to the module. Use twisted-pair wire to eliminate noise and thermal offsets.
• Maintain temperature between 18 and 28 °C.
• Keep relative humidity below 80%.
• Allow a warm-up time of at least 15 minutes for the SCXI module and 30 minutes for the E Series DAQ device to ensure the measurement circuitry is at a stable operating temperature.

Verification Procedures

The SCXI-1100 does not maintain user-adjustable calibration constants, so you can only verify the performance of the module.

Setting Up the Module
Complete the following steps to set up the SCXI-1100 for testing.

1. Install the SCXI-1100 in slot 1 of the SCXI chassis.
2. Using an SCXI-1349 cable adapter, connect a 68-to-68-pin cable between the SCXI-1100 module and the E Series DAQ device installed in the host computer, as shown in Figure 1.
3. Configure the hardware with Measurement & Automation Explorer (MAX). If you need more information on configuring the system, refer to the E Series DAQ device and SCXI-1100 documentation, which is available at ni.com/manuals.
4. Set all jumpers to their factory-default settings, as shown in Table 1.

Table 1. Factory-Default Jumper Settings:

The SCXI-1100 module has jumpers that you can use to change the filter settings, as shown in Table 2. During the verification procedure, you need to change the filter settings to verify both the 4 Hz and 10 kHz measurement accuracies. You can change the filter settings without powering off the SCXI chassis.

Table 2. Jumper Filter Settings:

Verifying the Performance of the Module
The verification procedure determines how well the SCXI-1100 module is meeting its specifications. You can use this information to select the appropriate calibration interval for your application.

Note All calibration functions are contained in nidaq32.dll. For more information on these functions, refer to the NI-DAQ Function Reference Help, which is available at ni.com/manuals.

Complete the following steps to verify the performance of the SCXI-1100.

1. Read the Test Conditions section.

2. Refer to the Uncalibrated Offset Limit and Table 4 for the specification limits to test. NI recommends that you verify all ranges and gains, but you can save time by checking only those ranges used in your application. Channel 0 is the only channel requiring verification because the SCXI-1100 module only contains one instrumentation amplifier.

3.  Ensure that the E Series DAQ device is connected to the SCXI-1100.
   Note NI recommends that you calibrate only the module that is connected to the E Series DAQ device. Do not calibrate the module in multiplexed mode.

4. Call Calibrate_E_Series to minimize the uncertainty associated with the E Series DAQ device. Set the following parameters:

   • deviceNumber = The device number assigned by MAX
   • calOp = ND_SELF_CALIBRATE (32700)
   • setOfCalConst = ND_USER_EEPROM_AREA (37000)
   • calRefVolts = 0.0

5. Call MIO_Config to enable dithering on the E Series DAQ device measurements. Set the following parameters:

   • deviceNumber = The device number assigned by MAX
   • dither = 1
   • useAMUX = 0

6. Configure the module jumpers for the 4 Hz filter, as shown in Table 2.

7. Call SCXI_Calibrate_Setup. Set the following parameters:

   • chassisID = The value assigned by MAX
   • moduleSlot = 1
   • calOp = 1

8. Call SCXI_Single_Chan_Setup to configure the module for single channel measurements. Set the following parameters:

   • chassisID = The value assigned by MAX
   • moduleSlot = 1
   • moduleChan = 0
   • DAQdeviceNumber = The device number for the E Series DAQ device, which is assigned by MAX

9. Call SCXI_Set_Gain to configure the module to the gain value you are testing. Set the following parameters:

   • chassisID = The value assigned by MAX
   • moduleSlot = 1
   • moduleChan = –1
   • gain = The gain value you are testing from Table 4

10. Wait 30 seconds for the input to settle.

11. Call DAQ_Op. Set the following parameters:

    • deviceNumber = The device number assigned by MAX
    • channel = 0
    • gain = 1 for a 16-bit E Series DAQ device or –1 for a 12-bit E Series DAQ device
    • count = 100
    • sampleRate = 100

12. Call SCXI_Scale to convert the reading from binary to voltage. Set the following parameters:

    • chassisID = The value assigned by MAX
    • moduleSlot = 1
    • channel = 0
    • SCXIgain = The gain you are testing
    • TBgain = 1
    • DAQboard = The device number for the E Series DAQ device
    • DAQChannel = 0
    • DAQgain = 1
    • numPoints = 100
    • binArray = The array returned from the DAQ_Op
      Average the results and compare this value to the offset limits in the Uncalibrated Offset Limit section.

13. Configure the module jumpers for the filter you are testing, as shown in Tables 1 and 2.

14. Call SCXI_Calibrate_Setup. Set the following parameters:

    • chassisID = The value assigned by MAX
    • moduleSlot = 1
    • calOp = 1

15. Call SCXI_Single_Chan_Setup to configure the module for single channel measurements. Set the following parameters:

    • chassisID = The value assigned by MAX
    • moduleSlot = 1
    • moduleChan = 0
    • DAQdeviceNumber = The device number for the E Series DAQ device, which is assigned by MAX

16. Call SCXI_Set_Gain to configure the module to the gain value you are testing. Set the following parameters:

    • chassisID = The value assigned by MAX
    • moduleSlot = 1
    • moduleChan = –1
    • gain = The gain value you are testing from Table 4

17. Wait for input to settle (1 s if you are testing the 4 Hz filter, 10 ms if you are testing the 10 kHz filter).

18. Call DAQ_Op. Set the following parameters:

    • deviceNumber = The device number assigned by MAX
    • channel = 0
    • gain = 1 for a 16-bit E Series DAQ device or –1 for a 12-bit E Series DAQ device
    • count = 100
    • sampleRate = 100

19. Call SCXI_Scale to convert the reading from binary to voltage. Set the following parameters:

    • chassisID = The value assigned by MAX
    • moduleSlot = 1
    • channel = 0
    • SCXIgain = The gain you are testing
    • TBgain = 1
    • DAQboard = The device number for the E Series DAQ device
    • DAQChannel = 0
    • DAQgain = 1
    • numPoints = 100
    • binArray = The array returned from the DAQ_Op
      Average the results and save the average for later calculations. This value is the zero offset that you subtract from subsequent measurements.

20. Call SCXI_Calibrate_Setup. Set the following parameters:

    • chassisID = The value assigned by MAX
    • moduleSlot = 1
    • calOp = 0

21. Call SCXI_Single_Chan_Setup to configure the module for single channel measurements. Set the following parameters:

    • chassisID = The value assigned by MAX
    • moduleSlot = 1
    • moduleChan = 0
    • DAQdeviceNumber = The device number for the E Series DAQ device, which is assigned by MAX

22. Call SCXI_Set_Gain to configure the module to the gain value you are testing. Set the following parameters:

    • chassisID = The value assigned by MAX
    • moduleSlot = 1
    • moduleChan = –1
    • gain = The gain value you are testing from Table 4

23. Input the test voltage listed in Table 4 into Channel 0 of the SCXI-1100 module.

24. Wait for input to settle (1 s if you are testing the 4 Hz filter, 10 ms if you are testing the 10 kHz filter).

25. Call DAQ_Op. Set the following parameters:

    • deviceNumber = The device number assigned by MAX
    • channel = 0
    • gain = 1 for a 16-bit E Series DAQ device or –1 for a 12-bit E Series DAQ device
    • count = 100
    • sampleRate = 100

26. Call SCXI_Scale to convert the reading from binary to voltage.
    Set the following parameters:

    • chassisID = The value assigned by MAX
    • moduleSlot = 1
    • channel = 0
    • SCXIgain = The gain you are testing
    • TBgain = 1
    • DAQboard = The device number for the E Series DAQ device
    • DAQChannel = 0
    • DAQgain = 1
    • numPoints = 100
    • binArray = The array returned from the DAQ_Op
      The result is a set of scaled voltages you read from the SCXI-1100 module.

27. Average the results returned from the SCXI_Scale. Subtract the zero offset that you calculated in step 12 from this averaged value. Compare the result to the upper and lower limits in Table 4.

28. Repeat steps 14 through 27 for the remaining test points and gains.

29. Repeat steps 6 through 28 for the remaining filter settings.

You have finished verifying the performance of the SCXI-1100 module. If the module fails to meet its required specifications, contact NI for repair or replacement.

Front and Rear Connector Pin Assignments

Table 3 shows the pin assignments for the SCXI-1100 module front signal connector. Figure 2 shows the pin assignments for the SCXI-1100 rear signal connector.

Table 3. Front Signal Pin Assignments:

Front Connector Diagram| Pin Number| Column A| Column B| Column C
---|---|---|---|---
| 32| CGND| CH0–| CH0+
31| NC| CH1–| CH1+
30| NC| CH2–| CH2+
29| NC| CH3–| CH3+
28| NC| CH4–| CH4+
27| NC| CH5–| CH5+
26| NC| CH6–| CH6+
25| NC| CH7–| CH7+
24| CGND| CH8–| CH8+
23| NC| CH9–| CH9+
22| NC| CH10–| CH10+
21| NC| CH11–| CH11+
20| NC| CH12–| CH12+
19| NC| CH13–| CH13+
18| NC| CH14–| CH14+
17| NC| CH15–| CH15+
16| CGND| CH16–| CH16+
15| NC| CH17–| CH17+
14| NC| CH18–| CH18+
13| NC| CH19–| CH19+
12| NC| CH20–| CH20+
11| NC| CH21–| CH21+
10| NC| CH22–| CH22+
9| NC| CH23–| CH23+
8| OUTPUT| CH24–| CH24+
7| AOREF| CH25–| CH25+
6| GUARD| CH26–| CH26+
5| CGND| CH27–| CH27+
4| DTEMP| CH28–| CH28+
3| MTEMP| CH29–| CH29+
2| CGND| CH30–| CH30+
1| +5V| CH31–| CH31+
Note: NC means no connection.

Specifications

This section contains test specifications for the SCXI-1100 module. The test point value should fall between the upper limit and lower limit values.

Uncalibrated Offset Limit

• Gain ………………………………………………..1
• Filter………………………………………………..4 Hz
• Offset ………………………………………………±(3 mV + E Series DAQ device offset)

Table 4. SCXI-1100 Filter Specifications:

Gain| Range (V)| Test Point (V)| 4 Hz Filter| 10 kHz Filter
---|---|---|---|---
Upper Limit (V)| Lower Limit (V)| Upper Limit (V)| Lower Limit (V)
1| 10.000| 9.5000| 9.505015| 9.494985| 9.505015| 9.494985
1| 10.000| 0.0000| 0.000265| –0.000265| 0.000265| –0.000265
1| 10.000| –9.5000| –9.494985| –9.505015| –9.494985| –9.505015
2| 5.000| 4.5000| 4.506940| 4.493060| 4.506940| 4.493060
2| 5.000| 0.0000| 0.000190| –0.000190| 0.000190| –0.000190
2| 5.000| –4.5000| –4.493060| –4.506940| –4.493060| –4.506940
5| 2.000| 1.9000| 1.902965| 1.897035| 1.902965| 1.897035
5| 2.000| 0.0000| 0.000115| –0.000115| 0.000115| –0.000115
5| 2.000| –1.9000| –1.897035| –1.902965| –1.897035| –1.902965
10| 1.000| 0.9500| 0.951510| 0.948490| 0.951511| 0.948489
10| 1.000| 0.0000| 0.000085| –0.000085| 0.000086| –0.000086
10| 1.000| –0.9500| –0.948490| –0.951510| –0.948489| –0.951511
20| 0.500| 0.4500| 0.450750| 0.449250| 0.450751| 0.449249
20| 0.500| 0.0000| 0.000075| –0.000075| 0.000076| –0.000076
20| 0.500| –0.4500| –0.449250| –0.450750| –0.449249| –0.450751
50| 0.200| 0.1900| 0.190345| 0.189655| 0.190346| 0.189654
50| 0.200| 0.0000| 0.000060| –0.000060| 0.000061| –0.000061
50| 0.200| –0.1900| –0.189655| –0.190345| –0.189654| –0.190346
100| 0.100| 0.0950| 0.095198| 0.094803| 0.095199| 0.094802
100| 0.100| 0.0000| 0.000055| –0.000055| 0.000056| –0.000056
100| 0.100| –0.0950| –0.094803| –0.095198| –0.094802| –0.095199
200| 0.050| 0.0450| 0.045123| 0.044878| 0.045124| 0.044877
200| 0.050| 0.0000| 0.000055| –0.000055| 0.000056| –0.000056
200| 0.050| –0.0450| –0.044878| –0.045123| –0.044877| –0.045124
500| 0.020| 0.0190| 0.019079| 0.018922| 0.019080| 0.018921
500| 0.020| 0.0000| 0.000050| –0.000050| 0.000051| –0.000051
500| 0.020| –0.0190| –0.018922| –0.019079| –0.018921| –0.019080
---|---|---|---|---|---|---
1000| 0.010| 0.0095| 0.009560| 0.009440| 0.009561| 0.009439
1000| 0.010| 0.0000| 0.000046| –0.000046| 0.000047| –0.000047
1000| 0.010| –0.0095| –0.009440| –0.009560| –0.009439| –0.009561
2000| 0.005| 0.0045| 0.004552| 0.004448| 0.004553| 0.004447
2000| 0.005| 0.0000| 0.000046| –0.000046| 0.000047| –0.000047
2000| 0.005| –0.0045| –0.004448| –0.004552| –0.004447| –0.004553

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References

• Test and Measurement Systems, a part of Emerson - NI
• Product Documentation - NI

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