National Instruments 9218 Manual

CALIBRATION PROCEDURE

NI 9218

2-Channel, 24-Bit, Universal Analog Input Module

This document contains information for calibrating the National Instruments 9218. For more

information on calibration, visit ni.com/calibration.

Contents

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

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

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

Test Conditions......................................................................................................................... 4

Initial Setup............................................................................................................................... 5

Verification ............................................................................................................................... 5

Current Accuracy Verification, 20 mA mode .................................................................. 6

Voltage Accuracy Verification, 60 V mode ..................................................................... 7

Voltage Accuracy Verification, 16 V mode ..................................................................... 9

Voltage Accuracy Verification, 65 mV mode .................................................................. 10

Voltage Accuracy Verification, IEPE 5 V mode.............................................................. 12

Bridge Accuracy Verification, 22 mV/V mode................................................................ 14

Adjustment................................................................................................................................ 17

Voltage Accuracy Adjustment, 16 V mode...................................................................... 17

Voltage Accuracy Adjustment, 60 V mode...................................................................... 18

Voltage Accuracy Adjustment, 65 mV mode................................................................... 19

Current Accuracy Adjustment, 20 mA mode ................................................................... 20

Voltage Accuracy Adjustment, IEPE 5 V mode .............................................................. 20

Bridge Accuracy Adjustment, 22 mV/V mode ................................................................ 21

EEPROM Update ..................................................................................................................... 23

Reverification ........................................................................................................................... 23

Accuracy Under Calibration Conditions .................................................................................. 23

Worldwide Support and Services ............................................................................................. 24

Pinout Signals ........................................................................................................................... 25

Software

Calibrating the NI 9218 requires the installation of NI-DAQmx 15.1or 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.

2|ni.com |NI 9218 Calibration Procedure

Documentation

Consult the following documents for information about the NI 9218, 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 9218 Getting Started Guide

NI 9218 connection information

NI 9218 Datasheet

NI 9218 circuitry and specifications

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 9218 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.

Table 1. Recommended Equipment

Equipment

Recommended

Model

Where Used

Minimum RequirementsVerification Adjustment

Calibrator Fluke 5700A

±60 V,

±16 V,

±65 mV

mode

±16 V,

±65 mV

mode

Use a device that can source

voltages as high as ±50 V and

meets the following

specifications:

≤100 ppm gain error.

≤3 µV offset error.

<3 µV offset at voltages less

than 60 mV.

<200 mV offset at voltages

less than 15 V.

<1 mV offset at voltages less

than 60 V.

± 20 mA

mode —

Use a device that can source

currents as high as ±15 mA,

<200 ppm gain error, and

offset error <1 µA.

IEPE ±5 V

mode

IEPE ±5 V

mode

Use a device that can source

1 kHz, 3 Vrms AC sinusoidal

signals with amplitude

uncertainty of 200 ppm

or less.

DMM (x2) NI 4071 —±60 V mode Use a DMM with <40 Ωof

error at resistances <400 kΩ.

Bridge,

±22 mV/V

mode

Bridge,

±22 mV/V

mode

For DMM1, use one DMM

with <50 ppm gain error, and

<50 µV of offset error at

voltages <3.5 V.

For DMM2, use a second

DMM with <50 ppm gain

error, and <2 µV of offset

error at voltages <50 mV.

4|ni.com |NI 9218 Calibration Procedure

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9218 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 9218 measurement

circuitry is at a stable operating temperature.

• Only one of each NI 9982, NI 9983, and NI 9987 is sufficient for this calibration procedure.

Discrete

Resistors —

Bridge,

±22 mV

mode

Bridge,

±22 mV

mode

TCR: <25 ppm/°C

Resistor values:

10 kΩ(2x), 249 Ω

cDAQ

Chassis

NI cDAQ-9178 All All —

Measurement

Adapter

NI 9982 (x2) ±16 V,

±65 mV,

Bridge

±22 mV/V,

IEPE ±5 V

mode

±60 V, ±16 V,

±65 mV,

Bridge

±22 mV/V,

IEPE ±5 V

mode

—

NI 9983 (x2) ±20 mA

mode

— —

NI 9987 (x2) ±60 V mode — —

Table 1. Recommended Equipment (Continued)

Equipment

Recommended

Model

Where Used

Minimum RequirementsVerification Adjustment

NI 9218 Calibration Procedure |© National Instruments |5

Initial Setup

Complete the following steps to set up the NI 9218.

1. Install NI-DAQmx.

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

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 module 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 Measurement & Automation Explorer (MAX).

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

properly.

9. Ensure that the ambient temperature of your test environment is 23 °C ±5 °C.

Verification

This section provides instructions for verifying the NI 9218 specifications. The following

performance verification procedures describe the sequence of operations and test points required

to verify the NI 9218 and assumes that adequate traceable uncertainties are available for the

calibration references.

Note Each verification procedure requires the software configuration of a

measurement adapter. The software configuration is done through Measurement &

Automation Explorer. See KB 6T8GKTUX for how to configure your measurement

adapter in MAX.

Caution Each verification may have different wiring schemes. Consult the

diagram on your measurement adapter or Figure 10 and 11 for the most appropriate

connection diagram.

Caution The analog inputs on the NI 9218 are not grounded (floating). Ensure that

a single point in the test system is connected to ground to prevent the entire system

from floating.

6|ni.com |NI 9218 Calibration Procedure

Current Accuracy Verification, 20 mA mode

Complete the following procedure to determine the As-Found status of the NI 9218.

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

2. Connect the NI 9218 to the calibrator as shown in Figure 1.

Figure 1. Current Accuracy Verification Connections

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

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

5. Configure the NI 9218 for the NI 9983 measurement adapters using MAX.

6. Acquire and average samples.

a. Create an AI current task on the NI 9218 according to Table 2.

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

c. Start the task.

d. Average the readings and record the average.

e. Stop and clear the task.

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

Table 2. NI 9218 Configuration for Accuracy Verification

Min (mA) Max (mA) Scaled Units Channel Configuration

-20 20 Amps DC Coupled

Table 3. NI 9218 Timing Configuration

Sample Mode Samples Per Channel Rate (kHz)

Finite Samples 512 k 51.2

EX+

EX–

AI+

AI–

Calibrator

–

NI 9983

EX+

EX–

AI+

AI–

NI 9983 NI 9218

DSUB /LEMO

DSUB/LEMO

CH 0

CH 1

NI 9218 Calibration Procedure |© National Instruments |7

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

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

Note The test limits listed in Table 4 are derived using the values in Table 32.

Note The uncertainty of the calibration standard is not included in these limits.

10. Disconnect the calibrator from the NI 9218.

Voltage Accuracy Verification, 60 V mode

Complete the following procedure to determine the As-Found status of the NI 9218.

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

2. Connect the NI 9218 to the calibrator as shown in Figure 2.

Figure 2. Voltage Accuracy Verification Connections

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

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

5. Configure the NI 9218 for the 9987 measurement adapters using MAX.

Table 4. NI 9218 Verification Test Limits for Accuracy

Test Point 2-Year Limits

Location Value (mA) Lower Limit (mA) Upper Limit (mA)

Max 15 14.929 15.071

Mid 0-0.008 0.008

Min -15 -15.071 -14.929

AI+

AI–

NI 9987

Calibrator

–

AI+

AI–

NI 9987 NI 9218

DSUB/LEMO

CH 0

DSUB/LEMO

CH 1

8|ni.com |NI 9218 Calibration Procedure

6. Acquire and average samples.

a. Create an AI voltage task on the NI 9218 according to Table 5.

b. Configure the AI voltage task timing according to Table 6.

c. Start the task.

d. Average the readings and record the average.

e. Stop and clear the task.

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

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

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

Note The test limits listed in Table 7 are derived using the values in Table 32.

Note The uncertainty of the calibration standard is not included in these limits.

10. Disconnect the calibrator from the device.

Table 5. NI 9218 Configuration for Accuracy Verification

Min (V) Max (V) Scaled Units Channel Configuration

-60 60 Vo l t s DC Coupled

Table 6. NI 9218 Timing Configuration

Sample Mode Samples Per Channel Rate (kHz)

Finite Samples 512 k 51.2

Table 7. NI 9218 Verification Test Limits for Accuracy

Test Point 2-Year Limits

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

Max 50 49.827 50.173

Mid 0-0.008 0.008

Min -50 -50.173 -49.827

NI 9218 Calibration Procedure |© National Instruments |9

Voltage Accuracy Verification, 16 V mode

Complete the following procedure to determine the As-Found status of the NI 9218.

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

2. Connect the NI 9218 to the calibrator as shown in Figure 3.

Figure 3. Voltage Accuracy Verification Connections

3. Set the calibrator voltage to a Test Point value indicated in Table 10.

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

5. Configure the NI 9218 for the 9982 measurement adapters using MAX.

6. Acquire and average samples.

a. Create an AI voltage task on the NI 9218 according to Table 8.

b. Configure the AI voltage task timing according to Table 9.

c. Start the task.

d. Average the readings and record the averages.

e. Stop and clear the task.

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

Table 8. NI 9218 Configuration for Accuracy Verification

Min (V) Max (V) Scaled Units Channel Configuration

-16 16 Volts DC Coupled

Table 9. NI 9218 Timing Configuration

Sample Mode Samples Per Channel Rate (kHz)

Finite Samples 512 k 51.2

AI+

AI–/EX–

NI 9982

Calibrator

–

AI+

AI–/EX–

NI 9982NI 9218

DSUB/LEMO

CH 0

DSUB/LEMO

CH 1

10 |ni.com |NI 9218 Calibration Procedure

8. Compare the averages to the limits in Table 10.

9. Repeat steps 3 through 8 for each test point in Table 10.

Note The test limits listed in Table 10 are derived using the values in Table 32.

Note The uncertainty of the calibration standard is not included in these limits.

10. Disconnect the calibrator from the device.

Voltage Accuracy Verification, 65 mV mode

Complete the following procedure to determine the As-Found status of the NI 9218.

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

2. Connect the NI 9218 to the calibrator as shown in Figure 4.

Figure 4. Voltage Accuracy Verification Connections

3. Set the calibrator voltage to a Test Point value indicated in Table 13.

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

5. Configure the NI 9218 for the NI 9982 measurement adapters using MAX.

Table 10. NI 9218 Verification Test Limits for Accuracy

Test Point 2-Year Limits

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

Max 12 11.987 12.013

Mid 0-0.002 0.002

Min -12 -12.013 -11.987

NI 9982

EX+

EX–

AI+

AI–

Calibrator

–

NI 9982

AI+

AI–

NI 9218

DSUB/LEMO

CH 0

DSUB/LEMO

CH 1

EX+

EX–

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