National Instruments NI 9234 Manual

NI-9234

CALIBRATION PROCEDURE

NI 9234

4-Channel, ±5 V, 24-Bit Software-Selectable

IEPE and AC/DC Analog Input Module

This document contains the verification and adjustment procedures for the National

Instruments 9234. For more information on calibration, visit ni.com/calibration.

Contents

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

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

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

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

Initial Setup............................................................................................................................... 4

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

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

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

Phase Matching Verification ............................................................................................ 8

Common-Mode Rejection Ratio Verification .................................................................. 9

IEPE Current Verification ................................................................................................ 11

IEPE Compliance Voltage Verification ........................................................................... 12

Adjustment................................................................................................................................ 14

Accuracy Adjustment ....................................................................................................... 14

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

Reverification ........................................................................................................................... 15

Accuracy Under Calibration Conditions .................................................................................. 15

Worldwide Support and Services ............................................................................................. 16

Software

Calibrating the NI 9234 requires the installation of NI-DAQmx 9.2 or later on the calibration

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

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

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

2|ni.com |NI 9234 Calibration Procedure

Documentation

Consult the following documents for information about the NI 9234, 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 9234 Operating Instructions and Specifications

NI 9234 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 9234 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 5700A Accuracy,

Adjustment

Use a high-precision voltage source

with an accuracy ≤100 ppm and an

output that is able to be not grounded

(floating).

Function

Generator

NI 4461 Gain

Matching

Use a function generator capable of

sourcing 1 kHz and 10 kHz ±4.5 Vpk

AC sinusoidal signals with amplitude

uncertainty of ±10% or less.

Phase

Matching

Use a function generator capable of

sourcing both 1 kHz and 10 kHz

±4.5 Vpk AC sinusoidal signals with

amplitude uncertainty of ±10% or less.

CMRR Use a function generator capable of

sourcing 1 kHz ±4.5 Vpk AC sinusoidal

signals with amplitude uncertainty of

±0.04dB or less.

DMM NI 4070 IEPE

Current

Use DMM in current mode in the

smallest range to measure 2 mA DC

with a measurement uncertainty

≤0.5%.

Source

Measure

Unit (SMU)

Keithley Model

2400

IEPE

Compliance

Voltage

Use an SMU capable of sourcing 20 V

DC with an accuracy ≤0.1% while

sinking >2 mA DC.

BNC Cable — All Use a length appropriate for your

application.

Chassis NI cDAQ-9178 All —

4|ni.com |NI 9234 Calibration Procedure

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9234 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 9234 measurement

circuitry is at a stable operating temperature.

Initial Setup

Complete the following steps to set up the NI 9234.

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.

NI 9234 Calibration Procedure |© National Instruments |5

Verification

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

points required to verify the NI 9234 and assumes 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 9234.

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

2. Connect the NI 9234 to the calibrator as shown in Figure 1.

Figure 1. Accuracy Verification Connections to the NI 9234

3. Verify that the calibrator output is not grounded (floating).

Notes The analog inputs on the NI 9234 are grounded, so the calibrator must be

not grounded (floating) to prevent ground loop measurement errors.

To float the output of the Fluke 5700A, enable External Guard mode (EX GRD).

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

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

6. Acquire and average samples.

a. Create an AI voltage task on the NI 9234 according to Table 2.

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

c. Start the task.

Table 2. NI 9234 Configuration for Accuracy Verification

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

-5 5Vo l t s DC Coupled

Table 3. NI 9234 Timing Configuration

Sample Mode Samples Per Channel Rate (kHz)

Finite Samples 10240 10.24

NI 9234Calibrator

+AIx

–

6|ni.com |NI 9234 Calibration Procedure

d. Average the readings and record the average.

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

f. Clear the task.

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

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

Note The test limits listed in Table 4 are derived using the values in Table 21.

9. Disconnect the calibrator from the device.

10. Repeat steps 1 through 9 for each channel on the NI 9234.

Gain Matching Verification

Complete the following procedure to determine the As-Found status of the NI 9234.

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

2. Connect the NI 9234 to the calibrator. Refer to Figure 2 for a connection diagram.

Figure 2. Gain Matching Verification Connections to the NI 9234

3. Verify that the calibrator output is not grounded (floating).

Notes The analog inputs on the NI 9234 are grounded, so the calibrator must be

not grounded (floating) to prevent ground loop measurement errors.

To float the output of the Fluke 5700A, enable External Guard mode (EX GRD).

4. Set the calibrator voltage to 4.0 V.

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

Table 4. NI 9234 Verification Test Limits for Accuracy

Test Point 1-Year Limits

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

Max 4.0 3.9952 4.0048

Mid 0.0 -0.0012 0.0012

Min -4.0 -4.0048 -3.9952

NI 9234Calibrator

+AIx

–

NI 9234 Calibration Procedure |© National Instruments |7

6. Acquire and average samples.

a. Create an AI voltage task on the NI 9234 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 as V1.

e. Clear the task.

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

g. Set the calibrator voltage to -4.0 V.

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

i. Start the task.

j. Average the readings and record the average as V2.

k. Clear the task.

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

8. Disconnect the calibrator from the device.

9. Perform the following calculation using the recorded V1and V2values.

10. Repeat steps 1 through 9 for each channel.

11. Compare the channel-to-channel gain difference to the maximum limit of ±40 mdB.

If the Gain Matching verification procedure determines that the NI 9234 is outside of the limits,

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

Table 5. NI 9234 Configuration for Gain Matching Verification

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

-5 5Vo l t s DC Coupled

Table 6. Timing Configuration

Sample Mode Samples Per Channel Rate (kHz)

Finite Samples 10240 10.24

Gain dB() 20 10

log×V1V2

–

------------------











8|ni.com |NI 9234 Calibration Procedure

Phase Matching Verification

Complete the following procedure to determine the As-Found status of the NI 9234.

1. Connect the NI 9234 to the function generator as shown in Figure 3.

Figure 3. Phase Matching Verification Connections to the NI 9234

2. Configure function generator according to Table 7.

3. Set the function generator frequency to a value indicated in Table 10.

4. Acquire and average samples.

a. Create an AI voltage task on the NI 9234 according to Table 8.

Note Wait 20 s for the AC coupling filter on the NI 9234 to settle.

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

c. Enable the function generator.

d. Start the task.

Table 7. Function Generator Configuration for Phase Matching Verification

Signal Type Amplitude (Vpk)

Sinewave ±4.5

Table 8. NI 9234 Configuration for Phase Matching Verification

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

-5 5Vo l t s AC Coupled

Table 9. NI 9234 Timing Configuration

Sample Mode Samples Per Channel Rate (kHz)

Finite Samples 16384 51.2

NI 9234

Function

Generator

HI AI0

AI1

AI2

AI3

–

NI 9234 Calibration Procedure |© National Instruments |9

e. Disable the function generator.

f. Clear the task.

5. Calculate the phase for each channel on the NI 9234. NI recommends using the Extract

Single Tone Information VI to calculate phase.

6. Compare the channel-to-channel phase difference to the limits in Table 10.

7. Repeat steps 2 through 6 for each test point in Table 10.

If the Phase Matching verification procedure determines that the NI 9234 is outside of the limits,

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

Common-Mode Rejection Ratio Verification

Complete the following procedure to determine the As-Found status of the NI 9234.

1. Connect the NI 9234 to the function generator and short the positive pin and negative shell

of the NI 9234 channel.

2. Connect the function generator to the chassis ground as shown in Figure 4.

Figure 4. CMRR Verification Connections to the NI 9234

3. Configure the function generator according to Table 11.

Table 10. NI 9234 Verification Test Limits for Phase Matching

Generator Frequency (kHz) Phase Matching Channel-to-Channel Limit

1±0.085°

10 ±0.49°

Table 11. Function Generator Configuration for CMRR Verification

Signal Type Amplitude (Vpk)Frequency (kHz)

Sinewave ±0.5 1

Function

Generator NI 9234

+AIx

–

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