National Instruments 9212 Manuale

CALIBRATION PROCEDURE

NI 9212

This document contains the verification and adjustment procedures for the NI 9212. For more

information about calibration solutions, visit ni.com/calibration.

Note Refer to the NI TB-9212 Calibration Procedure on ni.com/manuals for

instructions on calibrating the NI TB-9212.

Contents

Software.................................................................................................................................... 2

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

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

Connecting the NI 9212.................................................................................................... 4

Test Conditions......................................................................................................................... 5

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

Verification ............................................................................................................................... 6

Voltage Verification ......................................................................................................... 6

CJC Verification ............................................................................................................... 8

Adjustment................................................................................................................................ 11

Voltage Adjustment .......................................................................................................... 11

CJC Adjustment................................................................................................................ 12

EEPROM Update ..................................................................................................................... 14

Reverification ........................................................................................................................... 14

Accuracy Under Calibration Conditions .................................................................................. 14

Worldwide Support and Services ............................................................................................. 15

2|ni.com |NI 9212 Calibration Procedure

Software

Calibrating the NI 9212 requires the installation of NI-DAQmx 15.1 or later on the calibration

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

LabVIEW, LabWindows™/CVI™, ANSI C, and .NET. When you install NI-DAQmx, you only

need to install support for the application software that you intend to use.

Documentation

Consult the following documents for information about the NI 9212, NI-DAQmx, and your

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

software.

NI cDAQ-9174/9178 Quick Start

NI-DAQmx installation and hardware setup

NI 9212 with NI TB-9212 Getting Started Guide

NI 9212 with NI TB-9212 specific information

NI 9212 with NI TB-9212 Datasheet

NI 9212 with NI TB-9212 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 9212 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 Requirements

Calibrator Fluke 5522A

locked in the

3.3 V range

Vo l t a g e

Verification,

Vo l t a g e

Adjustment,

CJC

Adjustment

A high-precision voltage source with

an accuracy of ≤70 ppm when

sourcing up to 50 µA.

Fluke 5522A CJC

Verification

A high-precision resistance source

with 2-wire compensation and an

accuracy of at least

• 660 ppm at 1,099.999 Ωrange,

• 18 ppm at 32,999.99 Ωrange,

• 30 ppm at 109,999.9 Ωrange.

If the resistance source does not have

2-wire compensation, the leadwire

resistance must be included in the

total resistance source accuracy.

Chassis NI cDAQ-9178 All —

Connection

Accessory

NI CAL-9212 All —

Digital

Multimeter

NI PXI-4071 CJC

Adjustment

A multiranging 7.5 digit digital

multimeter with an accuracy of at

least

• 8 ppm at 100 mV range

• 6 ppm at 10 V range

4|ni.com |NI 9212 Calibration Procedure

Connecting the NI 9212

The NI CAL-9212 eases the calibration process by providing a thermocouple connection that is

internally routed to all eight thermocouple channels, as well as input and sense connections to

two CJC channels. Refer to Figure 1 for a pinout of the NI CAL-9212.

Caution Do not connect voltages greater than 10 VDC to the NI CAL-9212.

Figure 1. NI CAL-9212 Pinout

Connect the NI CAL-9212 to the NI 9212 front connector as shown in Figure 2. Tighten the

two jackscrews on the NI CAL-9212 to hold it securely in place. Do not overtighten the

jackscrews.

Figure 2. Installing the NI CAL-9212

1 Ground Lug (on the bottom side of the NI CAL-9212 enclosure)

1 Jackscrews 2 NI CAL-9212 3 NI 9212

10VDC MAX

Low Voltage Only

C16

NI CAL-9212

CJC0 INPUT +

CJC0 INPUT –

CJC1 INPUT +

CJC1 INPUT –

CJC1 SENSE +

CJC1 SENSE –

CJC0 SENSE +

CJC0 SENSE –

TC –

TC +

J6 J4J3

J5 J2

NI 9212 Calibration Procedure |© National Instruments |5

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9212 meets

published specifications.

• Keep connections to the NI 9212 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 9212 are secure.

• Use shielded copper wire for all cable connections to the NI 9212. Use twisted-pairs wire

to eliminate noise and thermal offsets.

• Maintain an ambient temperature of 23 °C ±5 °C. The NI 9212 temperature will be greater

than the ambient temperature.

• Keep relative humidity below 80%.

• Allow a warm-up time of at least 15 minutes to ensure that the NI 9212 measurement

circuitry is at a stable operating temperature.

Initial Setup

Refer to the NI cDAQ-9174/9178 Quick Start for information about how to install the software

and hardware and how to configure the device in Measurement & Automation Explorer (MAX).

Complete the following steps to set up the NI 9212.

1. Install NI-DAQmx.

Note Ensure that you install NI-DAQmx 15.1 or later. Calibrating the NI 9212

using NI-DAQmx 14.5 or earlier may result in inaccurate readings.

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.

6|ni.com |NI 9212 Calibration Procedure

Verification

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

points required to verify the NI 9212. The verification procedures assume that adequate

traceable uncertainties are available for the calibration references.

Voltage Verification

Complete the following procedure to determine the As-Found status of the NI 9212.

1. Loosen the captive screws and remove the top cover from the NI CAL-9212.

2. Connect the calibrator to the NI CAL-9212, as shown in Figure 3.

Figure 3. Voltage Channel Verification Connections

3. Reinstall the top cover on the NI CAL-9212.

4. Connect the NI CAL-9212 to the NI 9212, as shown in Figure 2.

5. On the Fluke 5522A calibrator, lock the voltage range to 3.3 V to reduce loading error.

a. Set the output voltage to 2.0 V.

b. Press the 3.3 V auto button to lock the 3.3 V range.

6. Set the calibrator output to a Test Point value indicated in Table 4.

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

8. Acquire and average samples.

a. Create and configure an AI voltage channel on the NI 9212 according to Table 2.

Table 2. NI 9212 Voltage Channel Configuration

Physical Channels

Input Range (mV) Scaled

Units

Terminal

Configuration

Min Max

cDAQ1Mod8/ai0:7 -78.125 78.125 Vo l t s Differential

Calibrator NI CAL-9212

TC –

GROUND LUG

TC +

NI 9212 Calibration Procedure |© National Instruments |7

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

c. Start the task.

d. Average the readings.

e. Clear the task.

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

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

11. Repeat steps 6 through 10 for each test point.

12. Repeat steps 6 through 11 for each ADC timing mode on the NI 9212.

Note The test limits listed in Table 4 are derived using the values in Table 11.

Table 3. NI 9212 Voltage Channel Timing Configuration

ADC Timing Mode

Sample

Mode

Samples to

Read Rate (S/s) Timeout (s)

High Resolution Finite 20 1.8 30

Best 50 Hz Rejection 80 7.1

Best 60 Hz Rejection 100 8.3

High Speed 1,000 95

Table 4. NI 9212 Voltage Verification Test Limits for Positive and Negative Test Points

ADC

Timing

Mode

Range (mV) Test Point 1-Year Limits

Min Max Location

Value

(mV)

Lower

Limit (mV)

Upper

Limit (mV)

High

Resolution,

Best

50/60 Hz

Rejection

-78.125 78.125 Negative FS -70 -70.020 -69.980

Negative Mid -35 -35.013 -34.987

Positive Mid 35 34.987 35.013

Positive FS 70 69.980 70.020

High Speed Negative FS -70 -70.022 -69.978

Negative Mid -35 -35.014 -34.986

Positive Mid 35 34.986 35.014

Positive FS 70 69.978 70.022

8|ni.com |NI 9212 Calibration Procedure

13. Loosen the captive screws and remove the top cover from the NI CAL-9212.

14. Disconnect the calibrator from the NI CAL-9212.

15. Short the TC+ and TC- terminals on the NI CAL-9212 together.

16. Reinstall the top cover on the NI CAL-9212.

17. Acquire and average samples.

a. Create and configure an AI voltage channel on the NI 9212 according to Table 2.

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

c. Start the task.

d. Average the readings.

e. Clear the task.

18. Compare the average to the limits in Table 5.

Note The test limits listed in Table 5 are derived using the values in Table 11.

19. Repeat steps 17 through 18 for each ADC timing mode on the NI 9212.

20. Remove the NI CAL-9212 from the NI 9212.

21. Loosen the captive screws and remove the top cover from the NI CAL-9212.

22. Disconnect the short from the NI CAL-9212.

CJC Verification

Complete the following procedure to determine the As-Found status of the NI 9212.

1. Loosen the captive screws and remove the top cover from the NI CAL-9212.

2. Connect the calibrator to the NI CAL-9212, as shown in Figure 4.

Table 5. NI 9212 Voltage Verification Test Limits for Zero Test Points

ADC Timing

Mode

Range (mV) Test Point 1-Year Limits

Min Max Location

Value

(mV)

Lower

Limit (mV)

Upper

Limit (mV)

High

Resolution

-78.125 78.125 Zero 0-0.0051 0.0051

Best 50/60 Hz

Rejection

-0.0052 0.0052

High Speed -0.0056 0.0056

NI 9212 Calibration Procedure |© National Instruments |9

Figure 4. CJC Channel Verification Connections

3. Reinstall the top cover on the NI CAL-9212.

4. Connect the NI CAL-9212 to the NI 9212, as shown in Figure 2.

5. Set the calibrator to 2-Wire Compensation mode.

6. Set the calibrator output to a Test Point value indicated in Table 8.

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

8. Wait at least 15 seconds for the NI 9212 to settle before proceeding to the next step.

9. Acquire and average samples.

a. Create and configure an AI voltage channel on the NI 9212 according to Table 6.

b. Configure the AI voltage channel timing according to Table 7.

Table 6. NI 9212 CJC Channel Configuration

Physical Channels

Input Range (V) Scaled

Units

Terminal

Configuration

Min Max

cDAQ1Mod8/_cjtempx-2.5 2.5 Vo l t s RSE

Table 7. NI 9212 CJC Channel Timing Configuration

ADC Timing Mode

Sample

Mode

Samples to

Read Rate (S/s) Timeout (s)

High Resolution Finite 20 1.8 30

Best 50 Hz Rejection 80 7.1

Best 60 Hz Rejection 100 8.3

High Speed 1,000 95

Calibrator

HI SENSE

LO SENSE

NI CAL-9212

CJC

Input –

CJC

SENSE +

CJC

SENSE –

GROUND LUG

CJCxInput +

10 |ni.com |NI 9212 Calibration Procedure

c. Start the task.

d. Average the readings.

e. Clear the task.

10. Perform the following calculation to scale the voltage average to resistance.

11. Compare the calculated resistance to the limits in Table 8.

12. Repeat steps 9 through 11 for each ADC timing mode on the NI 9212.

13. Repeat steps 6 through 12 for each test point.

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

15. Remove the NI CAL-9212 from the NI 9212.

16. Loosen the captive screws and remove the top cover from the NI CAL-9212.

17. Disconnect the calibrator from the NI CAL-9212.

18. Repeat steps 2 through 17 for the other CJC channel on the NI 9212.

Note The test limits in Table 8 are derived using the values in Tables 6 and 12.

Table 8. NI 9212 CJC Verification Test Limits

ADC

Timing

Mode

Test Point 1-Year Limits

Location Value (Ω)Lower Limit (Ω)Upper Limit (Ω)

High

Resolution

Offset 1,000 998.31 1,001.69

Gain 1 19,000 18,983.26 19,016.74

Gain 2 100,000 99,870.09 100,129.91

Best

50/60 Hz

Rejection

Offset 1,000 998.2 1,001.8

Gain 1 19,000 18,982.76 19,017.24

Gain 2 100,000 99,864.75 100,135.25

High Speed Offset 1,000 997.37 1,002.63

Gain 1 19,000 18,908.53 19,091.47

Gain 2 100,000 99,125.27 100,874.73

Resistance 28000 Voltage

2.5 Voltage–

-------------------------------------=

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