National Instruments NI 9265 Gebrauchs- und Pflegehandbuch

CALIBRATION PROCEDURE

NI 9265

4-Channel, 0–20 mA, 16-Bit Analog Current Output Module

This document contains the verification and adjustment procedures for the National Instruments

9265. For more information on calibration solutions, 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 9265 requires the installation of NI-DAQmx 9.6 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.

2|ni.com |NI 9265 Calibration Procedure

Documentation

Consult the following documents for information about the NI 9265, 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 9265 Operating Instructions and Specifications

NI 9265 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 9265 Calibration Procedure |© National Instruments Corporation |3

Test Equipment

National Instruments recommends that you use the equipment in Table 1 for calibrating the

NI 9265. If the recommended equipment is not available, select a substitute using the

requirements listed in Table 1.

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9265 meets

published specifications.

• Keep connections to the NI 9265 as short as possible. Long cables and wires act as

antennae, picking up extra noise that can affect measurements.

• Verify that all connections to the NI 9265 are secure.

• Use shielded copper wire for all cable connections to the NI 9265. Use twisted-pair wire to

eliminate noise and thermal offsets.

• Maintain an ambient temperature of 23 °C ±5 °C. The NI 9265 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 9265 measurement

circuitry is at a stable operating temperature.

Initial Setup

Complete the following steps to set up the NI 9265.

1. Install NI-DAQmx.

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

3. Insert the module into slot 8 of the NI cDAQ-9178 chassis. Leave slots 1 through 7 of the

NI cDAQ-9178 chassis empty.

4. Connect the NI cDAQ-9178 chassis to your host computer.

5. Connect the power source to the NI cDAQ-9178 chassis.

6. Launch Measurement & Automation Explorer (MAX).

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

Table 1. Recommended Equipment

Equipment

Recommended

Model Requirements

DMM NI 4070 DMM Use a multiranging 6 1/2 digit DMM with a DC

current measurement accuracy of 400 ppm.

Chassis NI cDAQ-9178 —

Bench-Top

Power Supply

—9 VDC to 36 VDC output voltage.

4|ni.com |NI 9265 Calibration Procedure

Verification

The following performance verification procedure describes the sequence of operation and

provides test points required to verify the NI 9265. The verification procedure assumes that

adequate traceable uncertainties are available for the calibration references.

Accuracy Verification

Complete the following steps to determine the As-Found status of the NI 9265.

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

2. Connect the NI 9265 to the bench-top power supply and the DMM as shown in Figure 1.

Figure 1. NI 9265 Current Accuracy Connections

3. Set the DMM to read DC current in the 20 mA range.

4. Acquire a sample.

a. Create and configure an AO current task on the NI 9265 according to Table 2.

b. Start the task.

c. Generate a current output according to Table 3.

d. Wait the appropriate amount of time for the DMM measurement to settle.

e. Read the NI 9265 output current measurement from the DMM.

f. Clear the task.

Table 2. NI 9265 Configuration for Current Accuracy Verification

Range (A)

Scaled Units Custom ScaleMinimum Maximum

00.02 Amps None

Table 3. NI 9265 Output Configuration

Samples Per Channel Timeout

110.0

NI 9265

DMM

Power Supply

–

COMx

AOx

Power Supply COM

sup

NI 9265 Calibration Procedure |© National Instruments Corporation |5

5. Compare the DMM measurement to the test limits in Table 4.

6. Repeat steps 3 through 5 for each test point in Table 4.

7. Disconnect the DMM and bench-top power supply from the NI 9265.

8. Repeat steps 1 through 7 for each channel on the NI 9265.

Adjustment

The following adjustment procedure describes the sequence of operation required to adjust the

NI 9265.

Accuracy Adjustment

Complete the following procedure to adjust the accuracy of the NI 9265.

1. Adjust the NI 9265.

a. Initialize a calibration session on the NI 9265. The default password is NI.

b. Input the external temperature in degrees Celsius.

c. Call the NI 9265 get C Series adjustment points function to obtain an array of

recommended calibration currents for the NI 9265.

d. Connect the DMM and the bench-top power supply to the NI 9265 as shown in Figure 1.

e. Set the DMM to read DC current in the 20 mA range.

f. Call and configure the NI 9265 setup calibration function with the DAC value

obtained from the array of recommended calibration currents.

g. Wait the appropriate amount of time for the DMM measurement to settle.

h. Read the NI 9265 output current measurement from the DMM.

i. Call and configure the NI 9265 adjustment function according to Table 5.

j. Repeat steps f to i for each calibration current in the array.

k. Close the calibration session.

l. Disconnect the DMM from the NI 9265.

2. Repeat step 1 for each channel on the NI 9265.

Table 4. NI 9265 Test Limits for Current Accuracy Verification

Output Range (mA) Test Point 1-Year Limits

Min Max Location

Value

(mA)

Lower Limit

(mA)

Upper Limit

(mA)

0 20 Minimum 10.973868 1.026132

0 20 Maximum 19 18.955868 19.044132

Table 5. Adjustment Configuration

Physical Channel Reference Value

cDAQMod8/aoxThe NI 9265 output curent measured from the DMM.

6|ni.com |NI 9265 Calibration Procedure

EEPROM Update

When an adjustment procedure is completed, the NI 9265 internal calibration memory

(EEPROM) is immediately updated.

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 values in the following table are based on calibrated scaling coefficients, which are stored

in the onboard EEPROM.

The following accuracy table is valid for calibration under the following conditions:

• Ambient temperature 23 °C ±5 °C

• NI 9265 installed in slot 8 of an NI cDAQ-9178 chassis

• Slots 1 through 7 of the NI cDAQ-9178 chassis are empty

Note The test limits listed in Table 4 are derived using the values in Table 6.

Note For operational specifications, refer to the most recent NI 9265 Operating

Instructions and Specifications online at ni.com/manuals.

Table 6. NI 9265 Accuracy Under Calibration Conditions

Percentage of Reading (Gain Error) Percentage of Range* (Offset Error)

0.100% 0.122%

* Range equals 20.6 mA.

372667B-01 Aug13

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Worldwide Support and Services

The National Instruments website is your complete resource for technical support. At ni.com/

support you have access to everything from troubleshooting and application development

self-help resources to email and phone assistance from NI Application Engineers.

Visit ni.com/services for NI Factory Installation Services, repairs, extended warranty, and

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Communities using the manufacturer’s declaration of conformity. This system affords the user

protection for electromagnetic compatibility (EMC) and product safety. You can obtain the DoC

for your product by visiting ni.com/certification. If your product supports calibration,

you can obtain the calibration certificate for your product at ni.com/calibration.

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