NATIONAL INSTRUMENTS NI 9266 8 Channel C Series Current Output Module User Guide

: June 1, 2024
: NATIONAL INSTRUMENTS

Table of Contents

NATIONAL INSTRUMENTS NI 9266 8 Channel C Series Current Output Module
CALIBRATION PROCEDURE
Initial Setup
Adjustment
References
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NATIONAL INSTRUMENTS NI 9266 8 Channel C Series Current Output Module

CALIBRATION PROCEDURE

NI 9266
8-Channel C Series Current Output Module

This document contains the verification and adjustment procedures for the NI 9266. For more information on calibration solutions, visit ni.com/calibration.

Software
Calibrating the NI 9266 requires the installation of NI-DAQmx 18.1 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 9266, NI-DAQmx, and your application software. All documents are available on ni.com and help files install with the software.

NATIONAL INSTRUMENTS NI 9266 8 Channel C Series Current Output Module
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NATIONAL INSTRUMENTS NI 9266 8 Channel C Series Current Output Module
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Test Equipment
NI recommends that you use equipment in the following table for calibrating the NI 9266. If the recommended equipment is not available, select a substitute from the requirements column.

Equipment	Recommended Model	Requirements
DMM	NI 4070 DMM	Use a multi-ranging 6 1/2 digit DMM with a DC current

measurement accuracy of

400 ppm.

Chassis| cDAQ-9178| —
Bench-Top Power Supply| —| 9 V DC to 30 V DC output voltage with an output rated for at least 5 W.

Test Conditions
The following setup and environmental conditions are required to ensure the NI 9266 meets calibration specifications.

Keep connections to the NI 9266 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 9266 are secure.
Use shielded copper wire for all cable connections to the NI 9266. Use twisted-pairs wire to eliminate noise and thermal offsets.
Maintain an ambient temperature of 23 °C ± 5 °C. The NI 9266 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 9266 measurement circuitry is at a stable operating temperature.

Initial Setup

Complete the following steps to set up the NI 9266.

Install NI-DAQmx.
Make sure that the cDAQ-9178 power source is not connected to the chassis.
Insert the module in slot 8 of the cDAQ-9178 chassis. Leave slots 1 through 7 of the cDAQ-9178 chassis empty.
Connect the cDAQ-9178 chassis to your host computer.
Connect the power source to the cDAQ-9178 chassis.
Launch Measurement & Automation Explorer (MAX).
Right-click the device name and select Self-Test to ensure that the module is working properly.

Verification
The following performance verification procedure describes the sequence of operation and provides test points required to verify the NI 9266. The verification procedure 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 9266.

Set the DMM to Standby mode (STBY) and disable the output of the bench-top power supply.
Connect the NI 9266 to the bench-top power supply and the DMM as shown in the following figure.
Enable the output of the bench-top power supply.
Set the DMM to read DC current in the 20 mA range and select the following settings.
- ≥1 PLC
- Auto Zero
- ADC calibration enabled
Acquire a sample.
- a. Create and configure an AO task according to the following table.
  Table 1. NI 9266 Configuration for Current Accuracy Verification** Range| Scaled Units| Custom Scale
  ---|---|---
  Minimum| Maximum**
  0| 0.02| Amps| None
- b. Start the task.
- c. Generate a current output test point by writing a single sample according to the following table.
  Table 2. NI 9266 Test Limits and Output Data Configuration for Current Accuracy Verification** Test Point Value (mA)| 1-Year Limits| Samples Per Channel| Timeout
  ---|---|---|---
  Lower Limit (mA)| Upper Limit (mA)**
  1| 0.97027| 1.02973|

1

|

10.0

19| 18.95101| 19.04899
The test limits in this table are derived from the values listed in Accuracy under Calibration Conditions.

d. Wait the appropriate amount of time for the DMM measurement to settle.
e. Read the NI 9266 output current measurement from the DMM.
f. Clear the task.

Compare the DMM measurement to the test limits in the table above.
Repeat step 5 for each test point in the table above.
Disconnect the DMM and bench-top power supply from the NI 9266.
Repeat steps 1 through 7 for each channel on the NI 9266.

Adjustment

The following performance adjustment procedure describes the sequence of operation required to adjust the NI 9266.

Accuracy Adjustment
Complete the following procedure to adjust the accuracy of the NI 9266.

Adjust the NI 9266.
- a) Initialize a calibration session on the NI 9266. The default password is NI.
- b) Input the external temperature in degrees Celsius.
- c) Call the NI 9266 get C Series adjustment points function to obtain an array of recommended calibration currents for the NI 9266.
- d) Connect the DMM and the bench-top power supply to the NI 9266 as shown in the Current Accuracy Connections figure.
- e) Set the DMM to read DC current in the 20 mA range.
- f) Call and configure the NI 9266 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 9266 output current measurement from the DMM.
- i) Call and configure the NI 9266 adjustment function according to the following table
  Physical Channel| Reference Value
  ---|---
  cDAQMod8/ao x| The NI 9266 output current measured from the DMM.
- j) Repeat steps f through i for each calibration current in the array.
- k) Close the calibration session.
- l) Disconnect the DMM from the NI 9266.
Repeat step 1 for each channel on the NI 9266.

EEPROM Update
When an adjustment procedure is completed, the NI 9266 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 Accuracy 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 9266 installed in slot 8 of a cDAQ-9178 chassis
Slots 1 through 7 of the cDAQ-9178 chassis are empty

Table 3. NI 9266 Accuracy under Calibration Conditions

Device| Percent of Reading (Gain Error)| Percentage of Range (Offset Error) 1
---|---|---
NI 9266| 0.107%| 0.138%

Note For operational specifications, refer to the most recent NI 9266 Datasheet online at ni.com/manuals.

Worldwide Support and Services
The NI website is your complete resource for technical support. At ni.com/support, you haveaccess to everything from troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers. Visit ni.com/services for information about the services NI offers. Visit ni.com/register to register your NI product. Product registration facilitates technical
support and ensures that you receive important information updates from NI. NI corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas, 78759-3504. NI also has offices located around the world. For support in the United States, create your service request at ni.com/support or dial 1 866 ASK MYNI (275 6964). For support outside the United States, visit the Worldwide Offices section of ni.com/niglobal to access the branch office websites, which provide up-to-date contact information.

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