National Instruments NI 9775 Manual

CALIBRATION PROCEDURE

NI 9775

±10 V, 20 MS/s/ch, 14-Bit, 4-Channel C Series Digitizer Module

This document contains the verification and adjustment procedures for the NI 9775. For more

information on calibration, visit ni.com/calibration.

Software

Calibrating the NI 9775 requires the installation of NI-DAQmx 17.6 or later. 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 9775, NI-DAQmx, and your

application software. All documents are available on ni.com/manuals and help files install with

the software.

•NI cDAQ-9174/9178 USB Chassis Quick Start

•NI 9775 Datasheet

•NI 9775 Getting Started Guide

•NI-DAQmx Readme

•LabVIEW Help

•NI-DAQmx C Reference Help

•NI-DAQmx .NET Help Support for Visual Studio

Test Equipment

The following table lists the equipment recommended for the performance verification and

adjustment procedures. If the recommended equipment is not available, select a substitute

using the requirements.

All manuals and user guides at all-guides.com

Table 1. Recommended Equipment

Equipment Recommended Model Requirements

Calibrator Fluke 5730A DC gain error <500 ppm, DC offset error <100 µV,

AC gain error <0.2%

Chassis cDAQ-9178 —

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9775 meets

published specifications.

• Keep connections to the NI 9775 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 9775 are secure.

• Maintain an ambient temperature of 23 °C ± 5 °C.

• Keep relative humidity below 80%.

• Allow a warm-up time of at least 15 minutes to ensure that the NI 9775 measurement

circuitry is at a stable operating temperature.

Initial Setup

Complete the following steps to set up the NI 9775.

1. Install NI-DAQmx.

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

3. Install the module in slot 8 of the cDAQ-9178 chassis. Leave slots 1 through 7 of the

cDAQ-9178 chassis empty.

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

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

6. Launch Measurement & Automation Explorer (MAX).

7. 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 test

points required to verify the NI 9775 and assumes that adequate traceable uncertainties are

available for the calibration references.

AC Accuracy Verification

Complete the following procedure to determine the As-Found Status of AC Accuracy of the

NI 9775.

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

2. Connect the NI 9775 to the calibrator as shown in the following figure.

Figure 1. Connections for DC and AC Accuracy Verification and Adjustment

NI 9775

Calibrator

AI1

AI0

AI2

AI3

–

3. Set the calibrator to generate AC voltage with settings shown in the following table.

Table 2. Calibrator Configuration for AC Accuracy Verification

Output Function Amplitude (V RMS) Frequency

AC Voltage 2.00 50 kHz

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

5. Acquire samples from the NI 9775 and extract 50 kHz amplitude information.

a) Create and configure an AI voltage task on the NI 9775 according to the following

table.

Table 3. NI 9775 AI Task Configuration for AC Accuracy Verification

Physical Channels Min (V) Max (V) Terminal Configuration Scaled Units

cDAQMod8/AI0:3 -10 10 RSE Volts

b) Configure the AI voltage task timing according to the following table.

Table 4. NI 9775 Timing Configuration for AC Accuracy Verification

Sample Mode Samples per Channel Rate

Finite Sample 40,000 20 MS/s

c) Configure the channel properties according to the following table.

NI 9775 Calibration Procedure | © National Instruments | 3

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Table 5. NI 9775 Channel Properties Configuration for AC Accuracy Verification

AI.ADCTimingMode AI.Lowpass.Enable

High Speed False

d) Start the task.

e) Read the samples from the NI 9775.

f) Extract the amplitude of the 50 kHz signal from each channel. This can be done

using the "Extract Single Tone Information.vi". The output of the "Extract Single

Tone Information.vi" is in Vpk. To obtain AC amplitude error in units of dB, use the

following equation:

    = 20 × log 10



2 × 2.0

g) Clear the task.

6. Compare the amplitude error to the limits in the following table

Table 6. NI 9775 Verification Limits for AC Accuracy

Test Point 1-Year Limits

Frequency Amplitude (V RMS) Upper Limit Lower Limit

50 kHz 2.00 0.12 dB -0.12 dB

Note The test limits listed in this table are derived using the values in the

NI 9775 Accuracy Under Calibration Conditions table.

Note The uncertainty of the calibration standard is not included in these

limits.

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

8. Disconnect the NI 9775 from the calibrator.

DC Accuracy Verification

Complete the following procedure to determine the As-Found status of DC Accuracy of the

NI 9775.

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

2. Connect the NI 9775 to the calibrator as shown in the AC Accuracy Verification section.

3. Set the calibrator voltage to a Test Point value indicated in the NI 9775 Verification Limits

for DC Accuracy table.

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

5. Acquire and average samples.

a) Create and configure an AI voltage task on the NI 9775 according to the following

table.

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Table 7. NI 9775 Configuration for DC Accuracy Verification

Physical Channels Min (V) Max (V) Terminal Configuration Scaled Units

cDAQMod8/AI0:3 -10 10 RSE Volts

b) Configure the AI voltage task timing according to the following table.

Table 8. NI 9775 Timing Configuration for DC Accuracy Verification

Sample Mode Samples per Channel Rate

Finite Sample 10,000 20 MS/s

c) Configure each test point according to the channel property settings in the following

table.

Table 9. NI 9775 Channel Properties Configuration for DC Accuracy Verification

AI.ADCTimingMode AI.Lowpass Enable

High Speed False

High Speed True

High Resolution True

d) Start the task.

e) Read the samples from the NI 9775.

f) Average the readings.

g) Stop and clear the task.

6. Compare the per-channel averages to the limits in the following table.

Table 10. NI 9775 Verification Limits for DC Accuracy

Channel Property Settings Test Point 1-Year Limits (V)

ADC Timing Mode Analog Lowpass

Filter

Location Value Upper Limit Lower Limit

High Speed Disabled Min -10.000 -9.931 -10.069

Mid 0.000 0.015 -0.015

Max 10.000 10.069 9.931

High Speed Enabled Min -10.000 -9.931 -10.069

Mid 0.000 0.015 -0.015

Max 10.000 10.069 9.931

NI 9775 Calibration Procedure | © National Instruments | 5

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Table 10. NI 9775 Verification Limits for DC Accuracy (Continued)

Channel Property Settings Test Point 1-Year Limits (V)

ADC Timing Mode Analog Lowpass

Filter

Location Value Upper Limit Lower Limit

High Resolution Enabled Min -10.000 -9.931 -10.069

Mid 0.000 0.015 -0.015

Max 10.000 10.069 9.931

Note The test limits in this table are derived using the values in the NI 9775

Accuracy Under Calibration Conditions table.

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 the NI 9775 Verification Limits for DC

Accuracy table.

9. Repeat steps 3 through 8 for each channel configuration in the NI 9775Channel

Properties Configuration for DC Accuracy Verification table.

10. Disconnect the NI 9775 from the calibrator.

Adjustment

The following performance adjustment procedure describes the sequence of operation required

to adjust the NI 9775.

AC Accuracy Adjustment

Complete the following procedure to adjust the AC accuracy performance of the NI 9775.

Note Adjust AC accuracy first, then DC accuracy. Always adjust DC accuracy

whenever you adjust AC accuracy.

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

2. Connect the NI 9775 to the calibrator as shown in the AC Accuracy Verification section.

3. Adjust the NI 9775.

a) Initialize a calibration session on the NI 9775. The default password is NI.

b) Input the external temperature in degrees Celsius with the DAQmx Set Temperature

C Series Function.

c) Call the NI 9775 get C Series adjustment points function with coupling mode set to

AC to obtain an array of recommended calibration frequency points for the NI 9775

Accuracy Adjustment.

d) Set the calibrator to a frequency value determined by the array or recommended

calibration frequency points. The AC voltage amplitude should be the value as

shown in the following table.

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Table 11. Calibrator Configuration for AC Accuracy Adjustment

Output Function Amplitude (V RMS)

AC Voltage 2.00

e) Wait for one second to allow the output amplitude of the calibrator to settle.

f) Call and configure the NI 9775 adjustment function according to the following table.

Table 12. NI 9775 AC Adjustment Configuration

Physical Channel Coupling Mode Reference Value

cDAQMod8/AI0:3 AC The output frequency setting of the calibrator in Hz

g) Repeat steps d through f for each point in the adjustment points array obtained in

step c.

h) Close and commit the calibration session.

i) Clear the task.

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

5. Disconnect the NI 9775 from the calibrator.

DC Accuracy Adjustment

Complete the following procedure to adjust the DC accuracy performance of the NI 9775.

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

2. Connect the NI 9775 to the calibrator as shown in the AC Accuracy Verification section.

3. Adjust the NI 9775.

a) Initialize a calibration session on the NI 9775. The default password is NI.

b) Input the external temperature in degrees Celsius.

c) Call the NI 9775 get C Series adjustment points function with coupling mode set to

DC to obtain an array of recommended calibration voltages for the NI 9775.

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 9775 adjustment function according to the following table.

Table 13. NI 9775 DC Adjustment Configuration

Physical Channel Coupling Mode Reference Value

cDAQMod8/AI0:3 DC The output voltage setting of the calibrator

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

h) Repeat steps d through g for each calibration voltage in the array.

i) Close and commit the calibration session.

j) Clear the task.

4. Disconnect the NI 9775 from the calibrator.

NI 9775 Calibration Procedure | © National Instruments | 7

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EEPROM Update

When an adjustment procedure is completed, the NI 9775 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 You must remove and re-insert the module from the chassis before running

verification.

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 9775 installed in slot 8 of an cDAQ-9178 chassis

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

Note The test limits listed in NI 9775 Verification Limits for DC Accuracy table are

derived using the values in the following table.

Table 14. NI 9775 Accuracy Under Calibration Conditions

Accuracy Type Gain Error Offset Error (mV)

AC ±1.39% —

DC ±0.54% ±15 mV

Note For operational specifications, refer to the NI 9775 Datasheet online at

ni.com/manuals.

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Worldwide Support and Services

The NI 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

other services.

Visit ni.com/register to register your NI product. Product registration facilitates technical

support and ensures that you receive important information updates from NI.

A Declaration of Conformity (DoC) is our claim of compliance with the Council of the

European 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.

NI corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas,

78759-3504. NI also has offices located around the world. For telephone support in the United

States, create your service request at ni.com/support or dial 1 866 ASK MYNI (275 6964). For

telephone 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,

support phone numbers, email addresses, and current events.

NI 9775 Calibration Procedure | © National Instruments | 9

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Information is subject to change without notice. Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for

information on NI trademarks. Other product and company names mentioned herein are trademarks or trade names of their

respective companies. For patents covering NI products/technology, refer to the appropriate location: Help»Patents in your

software, the patents.txt file on your media, or the National Instruments Patent Notice at ni.com/patents. You can find

information about end-user license agreements (EULAs) and third-party legal notices in the readme file for your NI product. Refer

to the Export Compliance Information at ni.com/legal/export-compliance for the NI global trade compliance policy and how

to obtain relevant HTS codes, ECCNs, and other import/export data. NI MAKES NO EXPRESS OR IMPLIED WARRANTIES AS

TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS. U.S.

Government Customers: The data contained in this manual was developed at private expense and is subject to the applicable

limited rights and restricted data rights as set forth in FAR 52.227-14, DFAR 252.227-7014, and DFAR 252.227-7015.

376632A-01 February 28, 2018

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