National Instruments SCXI-1104 Manual de usuario

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CALIBRATION PROCEDURE

SCXI -1104

Introduction

This document contains information and step-by-step instructions for

verifying and calibrating the National Instruments SCXI-1104 signal

conditioning module.

What Is Calibration?

Calibration is a procedure of reading offset and gain errors from a device

and updating special analog calibration circuitry that corrects these errors.

National Instruments calibrates every SCXI-1104 module at the factory.

During the factory calibration process, the calibration constants are stored

in the non-volatile memory of the device. These values are loaded from

memory and used as needed by the device.

Why Should You Calibrate?

Offset and gain errors drift with time and temperature, which could

invalidate the factory-set calibration of a device. Calibration restores the

device to its specified accuracy.

How Often Should You Calibrate?

The measurement accuracy requirements of your application

determine how often you should calibrate your SCXI-1104 module.

National Instruments recommends you perform a complete calibration

at least once every year. You can shorten this interval to six months or

90 days, based on the demands of your application.

™

SCXI-1104 Calibration Procedure 2 ni.com

Equipment and Other Test Requirements

This section describes the equipment, software, documentation, and test

conditions required for calibrating the SCXI-1104.

Test Equipment

Calibration requires a high-precision voltage source with at least 50 ppm

accuracy, a multiranging 5 1/2 digit digital multimeter (DMM) with

15 ppm accuracy, and a National Instruments E Series DAQ device.

National Instruments recommends the following instruments for

calibration of an SCXI-1104:

• Calibrator—Fluke 5700A

• DMM—NI 4060 or HP 34401A

• National Instruments E Series DAQ device

If these instruments are not available, use the accuracy requirements listed

above to select a substitute calibration standard.

Note If you do not have custom connection hardware, you will need a connector block

such as the National Instruments SCXI-1300, a shielded 68-pin connector cable, a 50-pin

ribbon cable, a 50-pin breakout box, and an SCXI adapter. These components give easy

access to the individual pins on the SCXI-1104 front and rear connectors.

Software and Documentation

You will need the following software and documentation to calibrate the

SCXI-1104. You can find these on the National Instruments Web site at

ni.com/calibration:

• The latest version of the National Instruments NI-DAQ driver

•NI-DAQ Function Reference Online Help file

• NI-DAQ User Manual for PC Compatibles

Software

The SCXI-1104 calibration procedure requires the latest version of the

National Instruments NI-DAQ driver on the calibration system. The driver

supports a number of programming languages, including LabVIEW,

LabWindows/CVI, Microsoft Visual C++, Microsoft Visual Basic, and

Borland C++. When you install the driver, you only need to install support

for the programming language you will use.

©National Instruments Corporation 3 SCXI-1104 Calibration Procedure

Documentation

The NI-DAQ Function Reference Online Help file and the NI-DAQ User

Manual for PC Compatibles containdetailedinformationonusingthe

NI-DAQ driver. The online help file includes detailed information on the

driver functions. You can access the online help file by clicking

Start»Programs»National Instruments DAQ»NI-DAQ Help. The user

manual provides instructions on installing and configuring

National Instruments DAQ devices. This manual also includes detailed

information on creating applications that use the NI-DAQ driver. These

are your primary references for writing your calibration utility. For further

information on the products you are calibrating, refer to your device user

manuals.

Test Conditions

Follow these guidelines to optimize the connections and the environment

during calibration:

•Keep connections to the SCXI module as short as possible. Long

cables and wires can act as antennae, which pick up extra noise that

can affect measurements.

•Use shielded copper wire for all cable connections to the device.

Use twisted-pair wire to eliminate noise and thermal offsets.

•Maintain the 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 device to ensure the measurement circuitry

is at a stable operating temperature.

Calibration

The calibration process consists of the following steps:

1. Setting up the module for testing.

2. Verifying the existing operation of the module to determine whether

your module is operating within its specifications.

3. Adjusting your module with respect to a known voltage source.

4. Verifying that the module is operating within its specifications after

adjustments.

SCXI-1104 Calibration Procedure 4 ni.com

Setting Up Your Module

Complete the following steps to set up your module for verification:

1. Install your SCXI-1104 in slot 1 of your SCXI chassis.

2. Connect a 68-to-68-pin cable between your SCXI module and E Series

DAQ device.

3. Configure the hardware with Measurement & Automation Explorer.

If your need more information on configuring the system, refer to the

E Series device and SCXI module documentation.

Verifying the Operation of Your Module

The verification procedure determines how well the SCXI-1104 module is

meeting its specifications. You can use this information to select the

appropriate calibration interval for your application.

Complete the following steps to verify the operation of your SCXI-1104:

1. Read the Test Conditions section earlier in this document.

2. Refer to Table 1 at the end of this document to see the test

specifications.

National Instruments recommends you verify all ranges and gains.

However, you can save time by checking only those ranges that you use

in your application.

3. Connect the E Series device to the SCXI-1104.

4. Call Calibrate_E_Series to minimize the uncertainty associated

with the E Series device. Set the following parameters:

•deviceNumber—The value obtained from Measurement &

Automation Explorer

•calOp—ND_SELF_CALIBRATE

•setOfCalConstants—ND_USER_EEPROM_AREA

•calRefVolts—0.0

5. Call AI_Configure to put the E Series device in bipolar mode. Set the

following parameters:

•deviceNumber—The value obtained from Measurement &

Automation Explorer

•chan—0

•inputMode—0

•inputRange—0

•polarity—0

•driveAIS—0

©National Instruments Corporation 5 SCXI-1104 Calibration Procedure

6. Call MIO_Config to enable dithering on your E Series device. Set the

following parameters:

•deviceNumber—The value obtained from Measurement &

Automation Explorer

•dither—1

•useAMUX—0

7. Connect the calibrator to the appropriate analog input, starting with

channel 0. Refer to Figure 1 to determine the pins on the 96-pin front

connector that correspond to the positive and negative inputs of the

specified channel. For example, the positive input for channel 0

(CH0+) is pin C32. The negative input for channel 0 (CH0–)ispin

B32. If you are using an SCXI-1300 breakout module connected to the

SCXI-1104, connect your calibrator to the CH0+ and CH0–inputs.

8. Call SCXI_Single_Chan_Setup to configure the module for

single-channel measurements. Set the following parameters:

•SCXIchassisID—The value obtained from Measurement &

Automation Explorer

•moduleSlot—1

•moduleChan—The channel you are verifying

•DAQdeviceNumber—The device number assigned by

Measurement & Automation Explorer for the E Series DAQ

device

9. Set your calibrator to output the test point voltage from Table 1.

10. Call DAQ_Op. Set the following parameters:

•deviceNumber—ThedevicenumberoftheDAQdevice

•channel—0

•gain—1 for 16-bit E Series devices or –1 for 12-bit E Series

devices

•count—100

•sampleRate—100

11. Call SCXI_Scale. Set the following parameters:

•SCXIChassisID—The value obtained from Measurement &

Automation Explorer

•moduleSlot—1

•channel—The channel you are verifying

•SCXIgain—0.1

•TBgain—1

•DAQboard—The device number for the DAQ device

SCXI-1104 Calibration Procedure 6 ni.com

•DAQChannel—0

•DAQgain—0 for 16-bit devices, –1 for 12-bit devices

•numPoints—100

•binArray—The array returned from the DAQ_Op function

The result is a set of scaled voltages that you read from the SCXI

module.

12. Average the results returned from the SCXI_Scale function. Compare

the averaged result to the upper and lower limits in Table 1. If the result

falls within these limits, your module has passed this portion of the

test. If it does not, use the steps in the next section, Adjusting Gain and

Offset Errors and Calibration Constants, to adjust your module.

13. Repeat steps 7 through 12 for the remaining channels.

You have now completed verifying the operation of your SCXI-1104.

Note If all channels fall within the upper and lower limits, your module does not need to

be adjusted.

Adjusting Gain and Offset Errors and Calibration Constants

This section contains step-by-step instructions on adjusting gain and offset

errors and calibration constants.

Adjusting Gain and Offset Errors

Complete the following steps to adjust gain and offset errors in your

SCXI-1104:

1. Read the Test Conditions section.

2. Connect the E Series device to the SCXI-1104.

3. Call Calibrate_E_Series to minimize the uncertainty associated

with the E series device. Set the following parameters:

•deviceNumber—The value obtained from Measurement &

Automation Explorer

•calOp—ND_SELF_CALIBRATE

•setOfCalConstants—ND_USER_EEPROM_AREA

•calRefVolts—0.0

4. Call AI_Configure to put the E Series device in bipolar mode. Set the

following parameters:

•deviceNumber—The value obtained from Measurement &

Automation Explorer

•chan—0

©National Instruments Corporation 7 SCXI-1104 Calibration Procedure

•inputMode—0

•inputRange—0

•polarity—0

•driveAIS—0

5. Call MIO_Config to enable dithering on your E Series device.

Set the following parameters:

•deviceNumber—The value obtained from Measurement &

Automation Explorer

•dither—1

•useAMUX—0

6. Call SCXI_Single_Chan_Setup to configure the module for

single-channel measurements. Set the following parameters:

•SCXIchassisID—The value obtained from Measurement &

Automation Explorer

•moduleSlot—1

•moduleChan—The channel you want to calibrate

•DAQdeviceNumber—The device number assigned by

Measurement & Automation Explorer for the E Series DAQ

device

7. Connect the calibrator to the channel you want to adjust. Refer to

Figure 1 to determine the pins on the 96-pin front connector that

correspond to the positive and negative inputs of the specified channel.

For example, the positive input for channel 0 is pin C32 which is

labeled CH0+. The negative input for channel 0 is pin B32 which is

labeled CH0–. If you are using an SCXI-1300 breakout module

connected to the SCXI-1104, connect your calibrator to the CH0+ and

CH0–inputs.

8. Connect your DMM to the positive output on pin 3 (MCHO+) and

negative output on pin 4 (MCHO–) on the rear panel connector.

Figure 2 shows the 50-pin rear panel connector pin assignments.

Tip For easy access to individual pins, use a screw terminal adapter connected to a

50-pin terminal block.

9. Set the calibrator voltage to the positive test point value in Table 1.

10. Read the voltage from the DMM. Record the actual DMM reading,

which is output1, and the calibrator output voltage, which is volt1,

for later use.

11. Set the calibrator to the negative test point value for the same gain.

Skip any input limits that are specified as 0 V. You need only upper and

lower limits for adjustment.

SCXI-1104 Calibration Procedure 8 ni.com

12. Read the voltage from the DMM. Record the actual DMM reading,

output2, and the calibrator output voltage, voltage2.

You now have two pairs of data points, (volt1,output1)and

(volt2,output2), where volt is the calibrator reading and output is

the DMM reading.

13. Convert the DMM voltage readings (output1 and output2)tobinary

readings (binary1 and binary2) by using one of the following

equations:

For example, using a 12-bit product such as a PCI-MIO-16E-1 and

obtaining a DMM reading of –9.9 V, you would have the following

results:

binary reading =(–9.9/20) × 212 =–2027.52

14. Record binary1 with volt1 and binary2 with volt2 for later use.

15. Repeat step 4 through 14 for the remaining channels you want to

adjust.

Adjusting Calibration Constants

Complete the following steps to adjust the calibration constants on your

SCXI-1104:

1. Call SCXI_Cal_Constants to create and store the new calibration

constants in the SCXI-1104 memory. Set the following parameters:

•SCXIchassisID—The ID assigned by Measurement &

Automation Explorer

•ModuleSlot—1, unless you have installed the module in a

different slot

•channel—The channel you want to adjust

•OpCode—2

•calibrationArea—0

•rangeCode—0 (not used for the SCXI-1104)

•SCXIgain—0.1

•DAQboard—The device number assigned by the Measurement

& Automation Explorer

•DAQChan—0

binary reading for 12-bit E Series products (binary) output

-----------------





212

×=

binary reading for 16-bit E Series praducts (binary) output

-----------------





216

×=

©National Instruments Corporation 9 SCXI-1104 Calibration Procedure

•DAQGain—1 for 16-bit devices, –1 for 12-bit devices

•Tbgain—1.0

•volt1 and volt2—The first and second voltage readings for the

gain values that you are about to save on the SCXI-1104

•binary1 and binary2—The first and second binary readings for

the gain values that you are about to save on the SCXI-1104

•calConst1 and calConst2—These are return values.

2. Repeat step 1, changing calibrationArea to 1.

3. Repeat step 1, changing calibrationArea to 3.

4. Repeat steps 1 through 3 for the next channel.

You have now adjusted the calibration constants.

Verifying Adjusted Values

After completing the adjustments, it is important to verify the adjusted

values by repeating the steps listed in the Verifying the Operation of Your

Module section of this document. Verifying the adjusted values ensures

your module is now operating within its specifications.

SCXI-1104 Calibration Procedure 10 ni.com

Front and Rear Panel Diagrams

Figure 1 shows the pin assignments for the SCXI-1104 module front panel

connector. Figure 2 shows the pin assignments for the SCXI-1104 rear

panel connector.

Figure 1. SCXI-1104 Front Connector Pin Assignments

+5 V

CGND

RSVD

CGND

CH31–

CH30–

CH29–

CH28–

CH27–

CH26–

CH25–

CH24–

CH23–

CH22–

CH21–

CH20–

CH19–

CH18–

CH17–

CH16–

CH15–

CH14–

CH13–

CH12–

CH11–

CH10–

CH9–

CH8–

CH7–

CH6–

CH5–

CH4–

CH3–

CH2–

CH1–

CH0–

CH31+

CH30+

CH29+

CH28+

CH27+

CH26+

CH25+

CH24+

CH23+

CH22+

CH21+

CH20+

CH19+

CH18+

CH17+

CH16+

CH15+

CH14+

CH13+

CH12+

CH11+

CH10+

CH9+

CH8+

CH7+

CH6+

CH5+

CH4+

CH3+

CH2+

CH1+

CH0+

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