National Instruments NI 9219 Manuale

CALIBRATION PROCEDURE

NI 9219

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

This document contains information for calibrating the NI 9219. For more information on

calibration, visit ni.com/calibration.

Contents

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

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

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

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

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

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

Voltage Accuracy Verification......................................................................................... 5

Thermocouple Accuracy Verification .............................................................................. 8

Current Accuracy Verification ......................................................................................... 10

2-Wire Resistance Accuracy Verification ........................................................................ 11

Quarter-Bridge Accuracy Verification ............................................................................. 13

4-Wire Resistance Accuracy Verification ........................................................................ 15

4-Wire RTD Accuracy Verification ................................................................................. 17

3-Wire RTD Accuracy Verification ................................................................................. 19

Half-Bridge Accuracy Verification .................................................................................. 22

Full-Bridge Accuracy Verification ................................................................................... 27

Adjustment................................................................................................................................ 31

Voltage and Thermocouple Accuracy Adjustment .......................................................... 31

Current Accuracy Adjustment .......................................................................................... 32

4-Wire and 2-Wire Resistance Accuracy Adjustment...................................................... 33

4-Wire RTD, 3-Wire RTD, and Quarter-Bridge Accuracy Adjustment .......................... 34

Half-Bridge Accuracy Adjustment ................................................................................... 35

Full-Bridge Accuracy Adjustment.................................................................................... 37

EEPROM Update ..................................................................................................................... 38

Reverification ........................................................................................................................... 38

Accuracy Under Calibration Conditions .................................................................................. 38

NI Services ............................................................................................................................... 40

2|ni.com |NI 9219 Calibration Procedure

Software

Calibrating the NI 9219 requires the installation of NI-DAQmx 9.3 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.

Documentation

Consult the following documents for information about the NI 9219, 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 9219 Operating Instructions and Specifications

NI 9219 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 9219 Calibration Procedure |© National Instruments Corporation |3

Table 1. Recommended Equipment

Equipment

Recommended

Model Where Used Minimum Requirements

Source Fluke 5700A Voltage Accuracy,

Thermocouple

Accuracy

Use a device that can source voltages as

high as 48 V and meets the following

specifications:

Noise:

≤5 mVpkpk 0.1 Hz–10 Hz at 48 V

≤500 μVpkpk 0.1 Hz–10 Hz at 12 V

≤500 μVpkpk 0.1 Hz–10 Hz at 3.2 V

≤50 μVpkpk 0.1 Hz–10 Hz at 0.8 V

≤5μVpkpk 0.1 Hz–10 Hz at 0.1 V

Current Accuracy Use a current source with noise

≤500 nApkpk 0.1 Hz–10 Hz.

Half-Bridge

Accuracy,

Full-Bridge

Accuracy

Use a voltage source with noise

≤500 μVpkpk 0.1 Hz–10 Hz at 3 V.

DMM (x2) NI 4071 Voltage Accuracy,

Thermocouple

Accuracy

Use a DMM with ≤30 ppm uncertainty for

voltage, and ≤0.8 μV offset error in

smallest range.

Resistance

Accuracy, RTD

Accuracy,

Quarter-Bridge

Accuracy

Use a DMM with ≤60 ppm uncertainty for

resistance, and ≤0.01 Ωoffset error in

smallest range.

Half-Bridge

Accuracy,

Full-Bridge

Accuracy

(DMM1) Use one DMM with ≤15 ppm

uncertainty for voltages under 3 V.

(DMM2) Use a second DMM with ≤20

ppm for uncertainty voltages under 1 V

and ≤0.8 μV offset error in smallest range.

Current Accuracy ≤270 ppm uncertainty for current,

≤2 nA offset error in smallest range

4|ni.com |NI 9219 Calibration Procedure

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9219 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 9219 measurement

circuitry is at a stable operating temperature.

Discrete

Resistors

—RTD Accuracy TCR: ≤10 ppm/°C

Resistor values: 4020 Ω± 1%, 402 Ω

± 1%, 20 Ω± 5%, 4.99 Ω±5%

Resistance

Accuracy

TCR: ≤10 ppm/°C

Resistor values: 8450 Ω± 1%, 845 Ω

± 1%, 20 Ω±5%

Quarter-Bridge

Accuracy

TCR: ≤10 ppm/°C

Resistor values: 309 Ω ± 1%, 121 Ω ±

1%, 4.99 Ω±5%

Half-Bridge

Accuracy

TCR: ≤10 ppm/°C

Resistor values: 1 kΩ± 1% (x2)

Full-Bridge

Accuracy

TCR: ≤10 ppm/°C

Resistor values: 10 kΩ± 1% (x2)

cDAQ

Chassis

NI cDAQ-9178 All —

Connection

Accessory

NI 9972 All —

Table 1. Recommended Equipment (Continued)

Equipment

Recommended

Model Where Used Minimum Requirements

NI 9219 Calibration Procedure |© National Instruments Corporation |5

Initial Setup

Complete the following steps to set up the NI 9219.

1. Install the NI-DAQmx driver software.

2. Install the NI 9219 in slot 8 of the NI cDAQ-9178 chassis. Leave slots 1 through 7 of the

NI cDAQ-9178 chassis empty.

3. Launch Measurement & Automation Explorer (MAX).

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

properly.

Verification

This section provides instructions for verifying the NI 9219 specifications. The following

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

to verify the NI 9219 and assumes that adequate traceable uncertainties are available for the

calibration references.

Caution The analog inputs on the NI 9219 are not grounded (floating). Ensure that

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

from floating.

Voltage Accuracy Verification

Complete the following steps to verify the voltage accuracy of an NI 9219.

1. Connect the NI 9219 to the DMM and source as shown in Figure 1.

6|ni.com |NI 9219 Calibration Procedure

Figure 1. Voltage Accuracy Verification Connections to the NI 9219

2. Set the source to the appropriate test point value indicated in Table 4. Use the smallest

available range needed to source each test point. Using a range larger than necessary creates

unwanted additional noise.

3. Configure the DMM for a voltage measurement in the lowest appropriate range according

to the test point from Table 4.

4. Enable Auto Zero on the DMM.

5. Acquire a voltage reading with the DMM. Record this measurement as Vref.

6. Acquire and average samples.

a. Create an AI voltage task on the NI 9219 according to Table 2.

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

Table 2. NI 9219 Configuration for Voltage Accuracy Verification

Measurement Type Minimum (V) Maximum (V)

Vo l t a g e –60 60

–15 15

–4 4

–1 1

–0.125 0.125

V+

V–

NI 9219

DMM

Source

HI (4)

LO (5)

Ch 0

HI (4)

LO (5)

Ch 1

HI (4)

LO (5)

Ch 2

HI (4)

LO (5)

Ch 3

NI 9219 Calibration Procedure |© National Instruments Corporation |7

c. Start the task.

d. Acquire 20 voltage readings with the NI 9219 and average the readings.

e. Record the average of the readings as Vchannel.

f. Clear the task.

7. Perform the following calculation using the recorded Vref and Vchannel values.

8. Compare the calculation result to the Upper Limit and Lower Limit values in Table 4.

Table 3. NI 9219 Timing Configuration

ADC Timing Mode Sample Timing Type

High Resolution On Demand

Table 4. NI 9219 Verification Test Limits for Voltage Accuracy

Range Test Point 1–Year Limits

Minimum

(V)

Maximum

(V) Location

Value

(V)

Lower

Limit (V)

Upper

Limit (V)

–60 60 Max 48 –0.07990 0.07990

Mid 0.0 –0.00100 0.00100

Min –48 –0.07990 0.07990

–15 15 Max 12 –0.02030 0.02030

Mid 0.0 –0.00080 0.00080

Min –12 –0.02030 0.02030

–4 4 Max 3.2 –0.00580 0.00580

Mid 0.0 –0.00060 0.00060

Min –3.2 –0.00580 0.00580

–1 1 Max 0.80 –0.000450 0.000450

Mid 0.00 –0.000014 0.000014

Min –0.80 –0.000450 0.000450

–0.125 0.125 Max 0.10 –0.000063 0.000063

Mid 0.00 –0.000010 0.000010

Min –0.10 –0.000063 0.000063

Accuracy =Vchannel –Vref

8|ni.com |NI 9219 Calibration Procedure

Note The test limits listed in Tables 4 are derived using the values in Table 53.

9. Set the source output to zero.

10. Repeat steps 2 through 9 for all test points on the NI 9219.

11. Repeat steps 2 through 10 for all channels on the NI 9219.

12. Disconnect the source and the DMM from the device.

Thermocouple Accuracy Verification

Complete the following steps to verify the thermocouple accuracy of an NI 9219.

1. Connect the NI 9219 to the DMM and source as shown in Figure 2.

Figure 2. Thermocouple Accuracy Verification Connections to the NI 9219

2. Set the source to the appropriate test point value indicated in Table 7. Use the smallest

available range needed to source each test point. Using a range larger than necessary creates

unwanted additional noise.

3. Configure the DMM for a voltage measurement in the lowest appropriate range according

to the test point from Table 7.

4. Enable Auto Zero on the DMM.

5. Acquire a voltage reading with the DMM. Record the measurement as Vref.

6. Acquire and average samples.

a. Create an AI thermocouple task on the NI 9219 according to Table 5.

V+

V–

NI 9219

DMM

Source

HI (4)

LO (5)

Ch 0

HI (4)

LO (5)

Ch 1

HI (4)

LO (5)

Ch 2

HI (4)

LO (5)

Ch 3

NI 9219 Calibration Procedure |© National Instruments Corporation |9

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

c. Start the task.

d. Acquire 20 unscaled I32 readings with the NI 9219.

e. Record the average of the readings as dataunscaled.

f. Clear the task.

7. Scale the data by using the formula below to change the unscaled data into volts.

where rangemax is the maximum value (mV) in Table 7.

8. Perform the following calculation using the recorded Vref and Vchannel values.

9. Compare the calculation result to the Upper Limit and Lower Limit values in Table 7.

Note The test limits listed in Table 7 are derived using the values in Table 53.

10. Set the source output to zero.

11. Repeat steps 2 through 10 for all test points on the NI 9219.

12. Repeat steps 2 through 11 for all channels on the NI 9219.

13. Disconnect the source and the DMM from the device.

Table 5. NI 9219 Configuration for Thermocouple Accuracy Verification

Measurement Type Minimum (°C) Maximum (°C)

Thermocouple 0100

Table 6. NI 9219 Timing Configuration

ADC Timing Mode Sample Timing Type

High Resolution On Demand

Table 7. NI 9219 Verification Test Limits for Thermocouple Accuracy

Range Test Point 1–Year Limits

Minimum

(mV)

Maximum

(mV) Location Value (V)

Lower Limit

(V)

Upper Limit

(V)

–125 125 Max 0.10 –0.000041 0.000041

Min 0.00 –0.000010 0.000010

Vchannel

dataunscaled

223

-------------------------------rangemax

×=

Accuracy Vchannel Vref

–=

10 |ni.com |NI 9219 Calibration Procedure

Current Accuracy Verification

Complete the following steps to verify the current accuracy of an NI 9219.

1. Connect the NI 9219 to the DMM and source as shown in Figure 3.

Figure 3. Current Accuracy Verification Connections to the NI 9219

2. Set the current source to the appropriate test point value indicated in Table 10. Use the

smallest available range needed to source each test point. Using a range larger than

necessary creates unwanted additional noise.

3. Configure the DMM for a current measurement in the lowest appropriate range according

to the test point from Table 10.

4. Enable Auto Zero on the DMM.

5. Acquire and average samples.

a. Create an AI current task on the NI 9219 according to Table 8.

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

Table 8. NI 9219 Configuration for Current Accuracy Verification

Measurement Type Physical Channels Minimum (A) Maximum (A)

Current ai0:3 –0.025 0.025

I+

I–

AMPS

NI 9219

DMM

Source

HI (3)

LO (5)

Ch 0

HI (3)

LO (5)

Ch 1

HI (3)

LO (5)

Ch 2

HI (3)

LO (5)

Ch 3

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