National Instruments NI-9207 Handbuch

CALIBRATION PROCEDURE

NI 9207

16-channel, ±2- mA/±10 V, 24-bit Analog Input Module

This document contains the verification and adjustment procedures for the National

Instruments 9207. For more information about calibration solutions, visit ni.com/

calibration.

Contents

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

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

Test Equipment......................................................................................................................... 2

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

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

Verification ............................................................................................................................... 3

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

Current Accuracy Verification ......................................................................................... 5

Adjustments .............................................................................................................................. 7

Voltage Accuracy Adjustment.......................................................................................... 7

Current Accuracy Adjustment .......................................................................................... 8

EEPROM Update ..................................................................................................................... 8

Reverification ........................................................................................................................... 9

Accuracy Under Calibration Conditions .................................................................................. 9

Worldwide Support and Services ............................................................................................. 10

Software

Calibrating the NI 9207 requires the installation of NI-DAQmx 9.1 or later on the calibration

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

LabVIEW, LabWindows™/CVI™, C/C++, C#, and Visual Basic .NET. When you install

NI-DAQmx you only need to install support for the application software that you intend to use.

ni.com/manuals

DeutschFrançais

2|ni.com |NI 9207 Calibration Procedure

Documentation

Consult the following documents for information about the NI 9207, NI-DAQmx, and your

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

software.

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.

NI cDAQ-9174/9178 USB Chassis Quick Start

NI-DAQmx installation and hardware setup

NI 9207 Operating Instructions and Specifications

NI 9207 specific information, specifications, and calibration interval

NI DAQmx Help

Information about creating applications that use the NI-DAQmx driver

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

Table 1. Recommended Equipment

Equipment

Recommended

Model Minimum Requirements

Source Fluke 5700A Use a source with an accuracy ≤100 ppm.

cDAQ Chassis NI cDAQ-9178 —

Connection

Accessory

NI 9923 —

NI 9207 Calibration Procedure |© National Instruments |3

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9207 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 device are secure.

• 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 ± 5 °C. The device temperature will be greater than

the ambient temperature.

• Keep relative humidity below 80%.

• Allow a warm-up time of at least 10 minutes to ensure that the NI 9207 measurement

circuitry is at a stable operating temperature.

Initial Setup

Complete the following steps to set up the NI 9207.

1. Install NI-DAQmx.

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

3. Install the module in slot 8 of the NI cDAQ-9178 chassis. Leave slots 1 through 7 of the

NI cDAQ-9178 chassis empty.

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

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

6. Launch Measurement & Automation Explorer (MAX).

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

properly.

Verification

The following performance verification procedures describe the sequence of operation and test

points required to verify the NI 9207 and assumes that adequate traceable uncertainties are

available for the calibration references.

4|ni.com |NI 9207 Calibration Procedure

Voltage Accuracy Verification

Complete the following procedure to determine the As-Found status of the NI 9207.

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

2. Connect the NI 9207 to the calibrator as shown in Figure 1.

Figure 1. Voltage Accuracy Connections

Note If the calibrator outputs are truly floating, connect the negative output to a

quiet earth ground as well as COM to give the entire system a ground reference.

3. Set the calibrator voltage to a Test Point value indicated in Table 4.

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

5. Acquire and average samples.

a. Create and configure an AI voltage task on the NI 9207 according to Table 2.

b. Configure the AI voltage task according toTable 3.Set the ADC timing mode to

high-resolution.

c. Start the task.

d. Average the readings.

e. Clear the task.

1 Connections when using a calibrator with a guard connection.

2 Connections when using a calibrator with no guard connection.

Table 2. NI 9207 Configuration for Voltage Accuracy Verification

Input Range

Scaled Units Terminal ConfigurationMin Max

-10 10 Volts Differential

Table 3. NI 9207 Voltage Timing Configuration

ADC Timing Mode Sample Mode Samples to Read

High-Resolution N Samples 5

High-Speed N Samples 75

NI 9207Calibrator

AIx–

AIx+

COM

Guard

NI 9207Calibrator

AIx–

AIx+

1 2

NI 9207 Calibration Procedure |© National Instruments |5

6. Compare the average to the limits in Table 4.

7. Repeat step 5 and 6 with the ADC timing mode on the NI 9207 set to high-speed.

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

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

10. Disconnect the calibrator from the device.

11. Repeat steps 1 through 10 for each voltage channel on the NI 9207.

Current Accuracy Verification

Complete the following procedure to determine the As-Found status of the NI 9207.

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

2. Connect the NI 9207 to the calibrator as shown in Figure 2.

Figure 2. Current Accuracy Connections

Note If the calibrator outputs are truly floating, connect the negative output to a

quiet earth ground as well as COM to give the entire system a ground reference.

3. Set the calibrator current to a Test Point value indicated in Table 7.

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

Table 4. NI 9207 Verification Test Limits for Voltage Accuracy

Range (V) Test Point 1-Year Limits

Minimum Maximum Location Value (V)

Lower Limit

(V)

Upper Limit

(V)

-10.00000 10.00000 Pos FS 10.00000 9.98792 10.01208

-10.00000 10.00000 Mid 0.00000 -0.00208 0.00208

-10.00000 10.00000 Neg FS -10.00000 -10.01208 -9.98792

NI 9207Calibrator

COM

AIx

Guard

NI 9207Calibrator

COM

AIx

1 2

6|ni.com |NI 9207 Calibration Procedure

5. Acquire and average samples.

a. Create and configure an AI voltage task on the NI 9207 according to Table 5.

b. Configure the AI current task according to Table 6. Set the ADC timing mode to

high-resolution.

c. Start the task.

d. Average the readings.

e. Clear the task.

6. Compare the average to the limits in Table 7.

7. Repeat steps 5 and 6 with the ADC timing mode on the NI 9207 set to high-speed.

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

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

10. Disconnect the calibrator from the device.

11. Repeat steps 1 through 10 for each current channel on the NI 9207.

Table 5. NI 9207 Configuration for Current Accuracy Verification

Input Range

Scaled Units Terminal ConfigurationMin Max

-0.02 0.02 Amps RSE

Table 6. Current Timing Configuration

ADC Timing Mode Sample Mode Samples to Read

High-Resolution N Samples 5

High-Speed N Samples 75

Table 7. NI 9207 Test Limits for Current Accuracy Verification

Range (A) Test Point 1-Year Limits

Minimum Maximum Location Value (A) Lower Limit (A) Upper Limit (A)

-0.020000 0.020000 Pos FS 0.021000 0.020970 0.021030

-0.020000 0.020000 Mid 0.000000 -0.000002 0.000002

-0.020000 0.020000 Neg FS -0.021000 -0.021030 -0.020970

NI 9207 Calibration Procedure |© National Instruments |7

Adjustments

The following performance adjustment procedures describe the sequence of operation required

to adjust the NI 9207.

Voltage Accuracy Adjustment

Complete the following procedure to adjust the voltage accuracy performance of the NI 9207.

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

2. Connect the NI 9207 to the calibrator as shown in Figure 1.

3. Adjust the NI 9207 voltage accuracy.

a. Initialize a calibration session on the NI 9207. The default password is NI.

b. Input the external temperature in degrees Celsius.

c. Call the NI 9207 get C Series adjustment points function to obtain an array of

recommended calibration voltages for the NI 9207.

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 9207 gain instance of the adjustment function according to

Table 8.

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

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

i. Disconnect the calibrator from the NI 9207.

j. Short the voltage channel to the 9207 AIGND.

k. Call the NI 9207 offset instance of the adjustment function for the physical channel.

l. Close the calibration session.

4. Remove the connections from the NI 9207.

5. Repeat steps 1 through 4 for each voltage channel on the NI 9207.

Table 8. Gain Adjustment Configuration

Physical Channel Reference Value

cDAQMod8/aixThe reference value from the array of adjustment points

8|ni.com |NI 9207 Calibration Procedure

Current Accuracy Adjustment

Complete the following procedure to adjust the current accuracy performance of the NI 9207.

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

2. Connect the NI 9207 to the calibrator as shown in Figure 2.

3. Adjust the NI 9207 current accuracy.

a. Initialize a calibration session on the NI 9207. The default password is NI.

b. Input the external temperature in degrees Celsius.

c. Call the NI 9207 get C Series adjustment points function to obtain an array of

recommended calibration currents for the NI 9207.

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

calibration currents.

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

f. Call and configure the NI 9207 gain instance of the adjustment function according to

Table 9.

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

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

i. Disconnect the calibrator from the NI 9207. Ensure that there are no connections to

the NI 9207.

j. Call the NI 9207 offset instance of the adjustment function for the current channel.

k. Close the calibration session.

4. Remove the connections from the NI 9207.

5. Repeat steps 1 through 4 for each current channel on the NI 9207.

EEPROM Update

When an adjustment procedure is completed, the NI 9207 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.

Table 9. Gain Adjustment Configuration

Physical Channel Reference Value

cDAQMod8/aixThe reference value from the array of adjustment points

NI 9207 Calibration Procedure |© National Instruments |9

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 values in the following table are based on calibrated scaling coefficients, which are stored

in the onboard EEPROM.

The following accuracy table is valid for calibration under the following conditions:

• Ambient temperature 23 °C ± 5 °C

• NI 9207 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 Tables 4 and 7 are derived using the values in

Table 10.

Note For operational specifications, refer to the most recent NI 9207 Operating

Instructions and Specifications online at ni.com/manuals.

Table 10. NI 9207 Accuracy Under Calibration Conditions

Input Channels Percentage of Reading Percentage of Range*

Vo l t a g e 0.100% 0.020%

Current 0.150% 0.012%

* Range equals 10.4 V for voltage and 22 mA for current.

375970C-01 Dec14

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