National Instruments NI 9229 Manual

CALIBRATION PROCEDURE

NI 9229/9239

4-Channel, ±60 V/±10 V, 24-Bit Simultaneous, Channel-to-Channel

Isolated Analog Input Modules

This document contains the verification and adjustment procedures for the National

Instruments 9229/9239. For more information about calibration solutions, visit ni.com/

calibration.

Contents

Software.................................................................................................................................... 1

Documentation.......................................................................................................................... 2

Test Equipment......................................................................................................................... 3

Test Conditions......................................................................................................................... 3

Initial Setup............................................................................................................................... 3

Verification ............................................................................................................................... 4

Accuracy Verification....................................................................................................... 4

Gain Matching Verification.............................................................................................. 6

Phase Matching Verification ............................................................................................ 7

Adjustment................................................................................................................................ 9

Accuracy Adjustment ....................................................................................................... 9

EEPROM Update ..................................................................................................................... 10

Reverification ........................................................................................................................... 10

Accuracy Under Calibration Conditions .................................................................................. 10

Worldwide Support and Services ............................................................................................. 11

Software

Calibrating the NI 9229/9239 requires the installation of NI-DAQmx 9.5 or later on the

calibration system. You can download NI-DAQmx from ni.com/downloads. NI-DAQmx

supports LabVIEW, LabWindows™/CVI™, ANSI C, Microsoft Visual C++, Microsoft Visual

Basic .NET, and Microsoft Visual C#. When you install NI-DAQmx you only need to install

support for the application software that you intend to use.

2|ni.com |NI 9229/9239 Calibration Procedure

Documentation

Consult the following documents for information about the NI 9229/9239, NI-DAQmx, and

your application software. All documents are available on ni.com and help files install with the

software.

NI cDAQ-9174/9178 USB Chassis Quick Start

NI-DAQmx installation and hardware setup

NI 9229/9239 Operating Instructions and Specifications

NI 9229/9239 specific information, specifications, and calibration interval

NI-DAQmx Readme

Operating system and application software support in NI-DAQmx

LabVIEW Help

LabVIEW programming concepts and reference information about NI-DAQmx

VIs and functions

NI-DAQmx C Reference Help

Reference information for NI-DAQmx C functions and NI-DAQmx C properties

NI-DAQmx .NET Help Support for Visual Studio

Reference information for NI-DAQmx .NET methods and NI-DAQmx .NET

properties, key concepts, and a C enum to .NET enum mapping table

NI 9229/9239 Calibration Procedure |© National Instruments |3

Test Equipment

Table 1 lists the equipment recommended for the performance verification and adjustment

procedures. If the recommended equipment is not available, select a substitute using the

requirements listed in Table 1.

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9229/9239

meets published specifications.

• Keep connections to the device as short as possible. Long cables and wires act as antennas,

picking up extra noise that can affect measurements.

• Verify that all connections to the NI 9229/9239 are secure.

•(NI 9229/9239 with screw-terminal) Use shielded copper wire for all cable connections

to the device.

• Use twisted-pairs wire to eliminate noise and thermal offsets.

• Maintain an ambient temperature of 23 °C ± 5 °C.

• Keep relative humidity below 80%.

• Allow a warm-up time of at least 10 minutes to ensure that the NI 9229/9239 measurement

circuitry is at a stable operating temperature.

Initial Setup

Complete the following steps to set up the NI 9229/9239.

1. Install the NI-DAQmx driver software.

2. Make sure the NI cDAQ-9178 power source is not connected.

Table 1. Recommended Equipment

Equipment

Recommended

Model

Parameter

Measured Requirements

Calibrator Fluke 5700A Accuracy,

Adjustment

Use a high-precision voltage source

with an accuracy ≤100 ppm and an

output impedance ≤50 Ω.

Function

Generator

NI 4461 Gain Matching,

Phase Matching

Use a function generator capable of

sourcing both 1 kHz and 20 kHz

±10 Vpk AC sinusoidal signals with

amplitude uncertainty of ±10%.

Chassis NI cDAQ-9178 All —

4|ni.com |NI 9229/9239 Calibration Procedure

3. Connect the NI cDAQ-9178 to the system safety ground.

a. Attach a ring lug to a 14 AWG (1.6 mm) wire.

b. Connect the ring lug to the ground terminal on the side of the NI cDAQ-9178 using

the ground screw.

c. Attach the other end of the wire to the system safety ground.

4. Install the NI 9229/9239 in slot 8 of the NI cDAQ-9178 chassis. Leave slots 1 through 7 of

the NI cDAQ-9178 chassis empty.

5. Connect the NI cDAQ-9178 chassis to your host computer.

6. Connect the power source to the NI cDAQ-9178 chassis.

7. Launch Measurements & Automation Explorer (MAX).

8. Right-click the device name and select Self-Test to ensure that the device is working

properly.

Verification

The following performance verification procedures describe the sequence of operation and

provide test points required to verify the NI 9229/9239. The verification procedures assume that

adequate traceable uncertainties are available for the calibration references.

Accuracy Verification

Complete the following procedure to determine the As-Found status of the NI 9229/9239.

1. Set the calibrator to Standby mode (STBY).

2. Connect the NI 9229/9239 to the calibrator as shown in Figure 1.

Figure 1. Accuracy Verification Connections

3. Set the calibrator voltage to a Test Point value indicated in Tables 4 or 5.

4. Set the calibrator to Operate mode (OPR).

NI 9229/9239 with

Screw-Terminal

Calibrator

AI1

–

AI0

–

AI2

–

AI3

–

NI 9229/9239

with BNC

Calibrator

AI1

AI0

AI2

AI3

–

NI 9229/9239 Calibration Procedure |© National Instruments |5

5. Acquire and average samples.

a. Create and configure an AI voltage task on the NI 9229/9239 according to Table 2.

b. Configure the AI voltage task timing according to Table 3.

c. Start the task.

d. Read samples from the NI 9229/9239.

e. Average the samples per channel.

f. Clear the task.

6. Compare the per channel average to the limits in Table 4 or Table 5.

Note The test limits listed in Table 4 and 5 are derived using the values in Table 14.

Table 2. NI 9229/9239 Configuration for Accuracy Verification

Module

Physical

Channels Min (V) Max (V)

Scaled

Units

Terminal

Configuration

9229 AI0:3 -60 60 Vo l t s Differential

9239 AI0:3 -10 10 Vo l t s Differential

Table 3. NI 9229/9239 Timing Configuration

Sample Mode Samples Per Channel Rate

Finite Samples 2000 8330

Table 4. NI 9229 Verification Test Limits for Accuracy

Range Test Point 1-Year Limits

Min (V) Max (V) Location Value (V) Lower Limit (V) Upper Limit (V)

-60 60 Max 57.00000 56.9695 57.0304

Mid 0.00 -0.00766 0.00766

Min -57.00000 -57.0304 -56.9695

Table 5. NI 9239 Verification Test Limits for Accuracy

Range Test Point 1-Year Limits

Min (V) Max (V) Location Value (V) Lower Limit (V) Upper Limit (V)

-10 10 Max 9.50000 9.4948 9.50515

Mid 0.00 -0.00135 0.00135

Min -9.50000 -9.50515 -9.4948

6|ni.com |NI 9229/9239 Calibration Procedure

7. Set the calibrator to Standby mode (STBY).

8. Repeat steps 3 through 7 for each test point in Table 4.

9. Disconnect the calibrator from the device.

Gain Matching Verification

Complete the following procedure to determine the As-Found status of the NI 9229/9239.

1. Connect the NI 9229/9239 to the function generator as shown in Figure 2.

Figure 2. Gain Matching Verification Connections

2. Configure function generator according to Table 6.

3. Acquire and average samples.

a. Create and configure an AI voltage task on the NI 9229/9239 according to Table 7.

Table 6. Function Generator Configuration for Gain Matching Verification

Signal Type Amplitude (Vpk)Frequency (kHz)

Sinewave 9 20

Table 7. NI 9229/9239 Configuration for Gain Matching Verification

Module

Physical

Channels Min (V) Max (V)

Scaled

Units

Terminal

Configuration

9229 AI0:3 -60 60 Vo l t s Differential

9239 AI0:3 -10 10 Vo l t s Differential

NI 9229/9239 with

Screw-Terminal

Function

Generator

AI1

–

AI0

–

AI2

–

AI3

–

NI 9229/9239

with BNC

Function

Generator

AI1

AI0

AI2

AI3

–

NI 9229/9239 Calibration Procedure |© National Instruments |7

b. Configure the AI voltage task timing according to Table 3.

c. Enable the function generator.

d. Start the task and wait for it to complete.

e. Calculate the amplitude for each reading and record the result as AmplitudeAcq.

f. Disable the function generator.

g. Clear the task.

4. Perform the following calculation using the AmplitudeAcq value.

5. Repeat step 4 for each channel.

6. Compare the channel-to-channel gain difference to the maximum limit of ±0.22 dB.

If the Gain Matching verification procedure determines that the NI 9229/9239 is outside of the

limits, refer to Worldwide Support and Services for assistance in returning the device to NI.

Phase Matching Verification

Complete the following procedure to determine the As-Found status of the NI 9229/9239.

1. Connect the NI 9229/9239 to the function generator as shown in Figure 3.

Figure 3. Phase Matching Verification Connections

Table 8. NI 9229/9239 Timing Configuration

Sample Mode Samples Per Channel Rate

Finite Samples 25000 50000

Amplitude dB() 20 10

log×AmplitudeAcq

----------------------------------- 











NI 9229/9239 with

Screw-Terminal

Function

Generator

AI1

–

AI0

–

AI2

–

AI3

–

NI 9229/9239

with BNC

Function

Generator

AI1

AI0

AI2

AI3

–

8|ni.com |NI 9229/9239 Calibration Procedure

2. Configure function generator according to Table 9.

3. Set the function generator frequency to a value indicated in Table 12.

4. Acquire and average samples.

a. Create and configure an AI voltage task on the NI 9229/9239 according to Table 10.

b. Configure the AI voltage task timing according to Table 3.

c. Enable the function generator.

d. Start the task.

e. Read samples.

f. Disable the function generator.

g. Clear the task.

5. Calculate the phase for each channel on the NI 9229/9239. NI recommends using the

Extract Single Tone Information VI to calculate phase.

Table 9. Function Generator Configuration for Phase Matching Verification

Signal Type Amplitude (Vpk)

Sinewave 9

Table 10. NI 9229/9239 Configuration for Phase Matching Verification

Module

Physical

Channels Min (V) Max (V)

Scaled

Units

Terminal

Configuration

9229 AI0:3 -60 60 Vo l t s Differential

9239 AI0:3 -10 10 Vo l t s Differential

Table 11. NI 9229/9239 Timing Configuration

Sample Mode Samples Per Channel Rate

Finite Samples 25000 50000

NI 9229/9239 Calibration Procedure |© National Instruments |9

6. Compare the channel-to-channel phase difference to the limits in Table 12.

7. Repeat steps 2 through 6 for each test point in Table 12.

If the Phase Matching verification procedure determines that the NI 9229/9239 is outside of the

limits, refer to Worldwide Support and Services for assistance in returning the device to NI.

Adjustment

The following performance adjustment procedure describes the sequence of operation required

to adjust the NI 9229/9239.

Accuracy Adjustment

Complete the following procedure to adjust the accuracy performance of the NI 9229/9239.

1. Set the calibrator to Standby mode (STBY).

2. Connect the NI 9229/9239 to the calibrator as shown in Figure 1.

Note If the calibrator outputs are truly floating, the negative output must be

connected to a quiet earth ground as well as AI- to give the entire system a ground

reference.

3. Adjust the NI 9229/9239.

a. Initialize a calibration session on the NI 9229/9239. The default password is NI.

b. Input the external temperature in degrees Celsius.

c. Call the NI 9229/9239 get C Series adjustment points function to obtain an array of

recommended calibration voltages for the NI 9229/9239.

d. Set the calibrator to a reference value determined by the array of recommended

calibration voltages.

e. Set the calibrator to Operate mode (OPR).

f. Call and configure the NI 9229/9239 adjustment function according to Table 13.

Table 12. NI 9229/9239 Verification Test Limits for Phase Matching

Module

Generator Frequency

(kHz) Phase Matching Channel-to-Channel Limit

NI 9229 1±0.045°

20 ±0.900°

NI 9239 1±0.075°

20 ±1.500°

10 |ni.com |NI 9229/9239 Calibration Procedure

g. Set the calibrator to Standby mode (STBY).

h. Repeat steps d through g for each calibration voltage in the array.

i. Close the calibration session.

4. Disconnect the NI 9229/9239 from the calibrator.

EEPROM Update

When an adjustment procedure is completed, the NI 9229/9239 internal calibration memory

(EEPROM) is immediately updated.

If you do not want to perform an adjustment, you can update the calibration date and onboard

calibration temperature without making any adjustments by initializing an external calibration,

setting the C Series calibration temperature, and closing the external calibration.

Reverification

Repeat the Verification section to determine the As-Left status of the device.

Note If any test fails Reverification after performing an adjustment, verify that you

have met the Test Conditions before returning your device to NI. Refer to Worldwide

Support and Services for assistance in returning the device to NI.

Accuracy Under Calibration Conditions

The following calibration specifications are valid under the following conditions:

• Ambient temperature 23 ± 5 °C

• NI 9229/9239 installed in slot 8 of an NI cDAQ-9178 chassis

• Slots 1 through 7 of the NI cDAQ-9178 chassis are empty

Note The test limits listed in Table 4 are derived using the values in Table 14.

Table 13. Adjustment Configuration

Physical Channel Reference Value

cDAQMod8/aixThe reference value from the array of adjustment points

Table 14. NI 9229/9239 Accuracy Under Calibration Conditions

Module Gain Error Offset Error

NI 9229 ±0.04% ±7.66 mV

NI 9239 ±0.04% ±1.35 mV

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