National Instruments 9232 Manual

CALIBRATION PROCEDURE
NI 9230/9232
This document contains the verification and adjustment procedures for the NI 9230 and NI 9232.
For more information on calibration, visit ni.com/calibration.
Contents
Software.................................................................................................................................... 1
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 3
Test Conditions......................................................................................................................... 3
Initial Setup............................................................................................................................... 3
Verification ............................................................................................................................... 4
Accuracy Verification....................................................................................................... 4
Adjustment................................................................................................................................ 5
Accuracy Adjustment ....................................................................................................... 5
EEPROM Update ..................................................................................................................... 6
Reverification ........................................................................................................................... 6
Accuracy Under Calibration Conditions .................................................................................. 6
Worldwide Support and Services ............................................................................................. 7
Software
Calibrating the NI 9230/9232 requires the installation of NI-DAQmx on the calibration system.
Table 1 shows the necessary versions for each connector variation.
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.
Table 1. Calibration System Software Requirements
Connector Variation Version Requirements
Screw-Terminal NI-DAQmx 14.5 or later
BNC NI-DAQmx 15.5 or later

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Documentation
Consult the following documents for information about the NI 9230/9232, 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 9230 Getting Started Guide
NI 9230 specific information
NI 9230 Datasheet
NI 9230 specifications and calibration interval
NI 9232 Getting Started Guide
NI 9232 specific information
NI 9232 Datasheet
NI 9232 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 9230/9232 Calibration Procedure |© National Instruments |3
Test Equipment
Table 2 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 2.
Test Conditions
The following setup and environmental conditions are required to ensure the NI 9230/9232
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 °C ±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 9230/9232 measurement
circuitry is at a stable operating temperature.
Initial Setup
Complete the following steps to set up the NI 9230/9232.
1. Install NI-DAQmx.
2. Make sure the NI cDAQ-9178 chassis power source is not connected to the chassis.
3. Connect the NI cDAQ-9178 chassis 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 chassis
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.
Table 2. Recommended Equipment
Equipment
Recommended
Model
Parameter
Measured Requirements
Calibrator Fluke 5700A Accuracy,
Adjustment
Use a high-precision voltage source
with an accuracy ≤100 ppm.
Chassis NI cDAQ-9178 All —

4|ni.com |NI 9230/9232 Calibration Procedure
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.
Verification
The following performance verification procedures describe the sequence of operation and
provide test points required to verify the NI 9230/9232. The verification procedures assume 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 9230/9232.
1. Set the calibrator to Standby mode (STBY).
2. Connect the NI 9230/9232 to the calibrator as shown in Figure 1.
Figure 1. Accuracy Verification Connections
3. Set the calibrator voltage to a Test Point value indicated in Table 5.
4. Set the calibrator to Operate mode (OPR).
5. Acquire and average samples of each channel.
a. Create and configure an AI voltage task on the NI 9230/9232 according to Table 3.
Table 3. NI 9230/9232 Configuration for Accuracy Verification
Min (V) Max (V) Scaled Units
Physical
Channels
Channel
Configuration
-30 30 Volts AI0:2 DC Coupled
NI 9230/9232 with
Screw-Terminal
Calibrator
HI
LO
AI1
–
+
AI0
–
+
AI2
–
+
NI 9230/9232
with BNC
Calibrator
HI
LO
AI1
AI0
AI2
+
–
+
–
+
–

NI 9230/9232 Calibration Procedure |© National Instruments |5
b. Configure the AI voltage task timing according to Table 4.
c. Start the task.
d. Average the samples acquired for each channel.
e. Stop and Clear the task.
6. Compare the average to the limits in Table 5.
Note The test limits listed in Table 5 are derived using the values in Table 7.
Note The uncertainty of the calibration standard is not included in these limits.
7. Set the calibrator to Standby mode (STBY).
8. Repeat steps 3 through 7 for each test point in Table 5.
9. Disconnect the calibrator from the device.
Adjustment
The following performance adjustment procedure describesthe sequence of operation required
to adjust the NI 9230/9232.
Accuracy Adjustment
Complete the following procedure to adjust the accuracy performance of the NI 9230/9232.
1. Set the calibrator to Standby mode (STBY).
2. Connect the NI 9230/9232 to the calibrator as shown in Figure 1.
3. Adjust the NI 9230/9232.
a. Initialize a calibration session on the NI 9230/9232. The default password is NI.
b. Input the external temperature in degrees Celsius.
Table 4. NI 9230/9232 Timing Configuration
Sample Mode Samples Per Channel Rate kS/s
NI 9230 Finite Samples 1280 12.8
NI 9232 Finite Samples 10240 102.4
Table 5. NI 9230/9232 Verification Test Limits for Accuracy
Range Test Point 1-Year Limits
Min (V) Max (V) Location Value (V) Lower Limit (V) Upper Limit (V)
-30 30 Max 28.5 28.46853 28.53147
Mid 0.00 -0.007245 0.007245
Min -28.5 -28.53147 -28.46853

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c. Call the NI 9230/9232 DAQmx Get C Series Calibration Adjustment Points function
to obtain an array of recommended calibration voltages for the NI 9230/9232.
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 9230/9232 adjustment function according to Table 6.
g. Set the calibrator to Standby mode (STBY).
h. Repeat steps d through g for each calibration voltage in the array.
i. Close the calibration session.
4. Disconnect the NI 9230/9232 from the calibrator.
EEPROM Update
When an adjustment procedure is completed, the NI 9230/9232 internal calibration memory
(EEPROM) updates immediately.
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.
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 following calibration specifications are valid under the following conditions:
• Ambient temperature 23 ±5 °C
• NI 9230/9232 installed in slot 8 of an NI cDAQ-9178 chassis
• Slots 1 through 7 of the NI cDAQ-9178 chassis are empty
Table 6. Adjustment Configuration
Physical Channel Reference Value
cDAQMod8/aixThe reference value from the array of adjustment points

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Note The test limits listed in Table 5 are derived using the values in Table 7.
Note For operational specifications, refer to the most recent NI 9230 Datasheet or
NI 9232 Datasheet online at ni.com/manuals.
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Table 7. NI 9230/9232 Accuracy Under Calibration Conditions
Percent of Reading (Gain Error) Percent of Range*(Offset Error)
0.085% 0.023%
*Range equals 31.5 V