National Instruments PXIe-7865 Handbuch

CALIBRATION PROCEDURE

NI PXIe-7865 and NI PXIe-7866

This document contains the verification and adjustment procedures for NI PXIe-7865/7866.

For more information about calibration solutions, visit ni.com/calibration.

Software

Calibrating the NI PXIe-7865/7866 requires installation of the correct software version on the

calibration system.

• LabVIEW 2019 SP1 or later

• NI R Series Multifunction RIO Device Drivers January 2020 or later

Documentation

Consult the following documents for information about your device, LabVIEW, and driver

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

software.

NI PXIe-7865 Getting Started Guide

NI PXIe-7865 specific information

NI PXIe-7865 Specifications

NI PXIe-7865 specifications and calibration interval

NI PXIe-7865 User Manual

NI PXIe-7865 specific information

NI PXIe-7866 Getting Started Guide

NI PXIe-7866 specific information

NI PXIe-7866 Specifications

NI PXIe-7866 specifications and calibration interval

NI PXIe-7866User Manual

NI PXIe-7866 specific information

LabVIEW Help

LabVIEW programming concepts and reference information

NI-RIO Help

NI-RIO and Multifunction RIO Device Drivers reference information

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 listed.

Table 1. Recommended Equipment

Equipment Recommended Model Requirements

Calibrator Fluke 5700A Use a high-precision voltage source that is

10 ppm or less.

DMM NI 4070 Use a multiranging 6½-digit DMM with an

accuracy of 250 ppm.

Counter Agilent 53131A Use a counter accurate to 0.01%.

Low thermal

copper EMF plug-

in cables

Fluke 5440A-7002 Do not use standard banana cables.

Shielded MIO

cable

NI SHC68-68-RMIO Use this high-performance shielded cable,

designed specifically for R Series devices,

when calibrating the NI R Series device.

Accessory NI SCB-68A The SCB-68A is a shielded I/O connector

block with 68 screw terminals for easy

signal connection to the R Series devices.

NI CB-68LP, NI TBX-68,

NI CB-68LPR

The CB-68LP, CB-68LPR, and TBX-68 are

low-cost termination accessories with 68

screw terminals for easy signal connection

to the R Series devices.

2| ni.com | NI PXIe-7865 and NI PXIe-7866 Calibration Procedure

Test Conditions

The following setup and environmental conditions are required to ensure the device 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.

• 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 15 minutes to ensure that the device measurement

circuitry is at a stable operating temperature.

Initial Setup

Refer to your getting started guide for your device for information about how to install the

software and hardware.

Note You can access all of the NI R Series VIs for calibration at <labview>

\vi.lib\LabVIEW Targets\FPGA\RIO\R Series\78XXR\783XR

\Calibration\Public.

Self-Calibration

Complete the following steps to self-calibrate the device.

Note No signal connections are needed for self-calibration.

1. Wait 15 minutes for the device to warm-up.

2. Launch the self-calibration VI nirio78xxCalibrationSelfCal.vi.

3. Call self-calibration before doing the first verification.

4. Pass a TRUE to Save Cal Results to save the constants to the user portion of the

flash memory. If you pass False, the constants are then discarded.

As-Found and As-Left Limits

The as-found (1-Year) limits are the published specifications for the NI PXIe-7865/7866. NI

uses these limits to determine whether the NI PXIe-7865/7866 meets the specifications when it

is received for calibration. Use the as-found limits during initial verification.

The as-left (24-Hour) calibration limits are equal to the published NI specifications for the NI

PXIe-7865/7866, less guard bands for measurement uncertainty, temperature drift, and drift

NI PXIe-7865 and NI PXIe-7866 Calibration Procedure | © National Instruments | 3

over time. NI uses these limits to reduce the probability that the instrument will be outside the

published specification limits at the end of the calibration cycle. Use the as-left limits when

performing verification after adjustment.

Verification

The following performance verification procedures describe the sequence of operation and

provide test points required to verify the NI PXIe-7865/7866. The verification procedures

assume that adequate traceable uncertainties are available for the calibration references.

Analog Input Accuracy Verification

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

PXIe-7865/7866.

1. Connect the NI R Series device to the calibrator as shown in the following figure.

Figure 1. Analog Input Verification Connections

Calibrator

AI1

–

AI0

–

2. If your calibrator has a guard connection, connect that terminal to AI GND.

3. Set the calibrator voltage to a Test Point value indicated in the appropriate Analog Input

Accuracy Verification Test Limits table in the Test Limits section of this document.

4. Measure the analog input voltage on each channel by calling

nirio78xxCalibrationReadAIVoltage.vi.

5. Compare the measured voltage with the 1-year limits from the appropriate Analog Input

Accuracy Verification Test Limits table to verify the input accuracy. If the value is within

these limits, the device passes the test.

6. Repeat steps 3 through 5 for each test point in the following Analog Input Accuracy

Verification Test Limits table.

4| ni.com | NI PXIe-7865 and NI PXIe-7866 Calibration Procedure

Table 2. Analog Input Accuracy Verification Test Limits

Range (V) Test Point 24-Hour Limits 1-Year Limits

Minimum Maximum Location

Value

(V)

Lower

Limit (V)

Upper

Limit (V)

Lower

Limit (V)

Upper

Limit (V)

-10 10

Positive

full-scale 10 9.998416 10.001584 9.997717 10.002283

0 0 -0.000639 0.000639 -0.000639 0.000639

Negative

full-scale -10 -10.001584 -9.998416 -10.002283 -9.997717

-5 5

Positive

full-scale 5 4.999180 5.000820 4.998830 5.001170

0 0 -0.000340 0.000340 -0.000340 0.000340

Negative

full-scale -5 -5.000820 -4.999180 -5.001170 -4.998830

-2 2

Positive

full-scale 2 1.999661 2.000339 1.999521 2.000479

0 0 -0.000137 0.000137 -0.000137 0.000137

Negative

full-scale -2 -2.000339 -1.999661 -2.0004790 -1.999521

-1 1

Positive

full-scale 1 0.999817 1.000183 0.999748 1.000252

0 0 -0.000074 0.000074 -0.000074 0.000074

Negative

full-scale -1 -1.000183 -0.999817 -1.000252 -0.999748

Analog Output Accuracy Verification

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

PXIe-7865/7866.

1. Connect the NI R Series device to the DMM as shown in the following figure.

NI PXIe-7865 and NI PXIe-7866 Calibration Procedure | © National Instruments | 5

Figure 2. Analog Output Verification Connections

DMMNI R Series

AO0

AOGND0

2. Set the DMM measurement range to 10 V.

3. Measure the analog output voltage on each channel by calling

nirio78xxCalibrationSetAOVoltage.vi.

4. Compare the resulting value shown by the DMM to the 1-year limits in the appropriate

Analog Output Accuracy Verification Test Limits table in the Test Limits section of this

document. If the value is within these limits, the device passes the test.

5. Repeat steps 3 through 4 for each test point in the following Analog Output Accuracy

Verification Test Limits table.

6. Disconnect the DMM from the NI R Series device.

7. Repeat steps 1 through 6 for all AO channels on the device.

Table 3. Analog Output Accuracy Verification Test Limits

Range (V) Test Point 24-Hour Limits 1-Year Limits

Minimum Maximum Location

Value

(V)

Lower

Limit (V)

Upper

Limit (V)

Lower

Limit (V)

Upper

Limit (V)

-10 10

Positive

full-scale 10 9.997852 10.002148 9.997502 10.002498

0 0.0 -0.001099 0.001099 -0.001099 0.001099

Negative

full-scale -10 -10.002148 -9.997852 -10.002498 -9.997502

Counter Verification

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

PXIe-7865/7866.

1. Connect the NI R Series device to the counter as shown in the following figure.

6| ni.com | NI PXIe-7865 and NI PXIe-7866 Calibration Procedure

Figure 3. Counter Verification Connections

NI PXIe-7865/7866

Counter

Connector1/DGND

Connector1/DIO0

–

Note The Agilent 53131A counter uses BNC connectors on its channels and

has no HI or LO inputs. Connections on the Agilent 53131A must be made

using BNC (50 Ω) to the patch cords or adapter.

2. Configure the counter to use time arming mode, with Gate Time set to 0.1 s.

3. Generate the counter output signal by calling

nirio78xxCalibrationStartCounter.vi.This VI causes the device to begin

outputting a square-wave on Connector1/DIO0 at 5 MHz.

4. Compare the value read by your counter to the test limits shown in the following

NI R Series Counter Verification Test Limits table. If the value is within these limits, the

device passes the test.

Table 4. NI R Series Counter Verification Test Limits

Set Point (MHz) Lower Limit (MHz) Upper Limit (MHz)

5.0 4.999500 5.000500

5. Stop the generation by calling nirio78xxCalibrationStopCounter.vi.

6. Disconnect the counter from your device.

Note If the Counter Verification procedure determines that the NI R Series device

is outside of the limits, refer to the Worldwide Support and Services section for

assistance in returning the device to NI.

Adjustment

The following performance adjustment procedure describes the sequence of operation require

to adjust the NI PXIe-7865/7866.

Note

• If the NI PXIe-7865/7866 device successfully passed each of the verification

procedures within the 24-hour test limits, then an adjustment is not required.

• If the NI PXIe-7865/7866 device is not within the 1-year test limits, then

adjustment is recommended to guarantee the published specifications for the

next year.

NI PXIe-7865 and NI PXIe-7866 Calibration Procedure | © National Instruments | 7

• Following the adjustment procedure automatically updates the calibration date

and temperature in the external calibration area of the onboard flash memory of

the NI PXIe-7865/7866 device.

• If an adjustment is not required use the

nirio78xxCalibrationUpdateExtCalDate.vi to update the External

Calibration date.

Complete the following procedure to adjust the calibration constants performance of the NI

PXIe-7865/7866 device.

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

2. Connect your device to the calibrator.

3. Initialize the external calibration process by calling

nirio78xxRCalibrationAdjustExtCal.vi. Set the Action to Initialize. This

action is password-protected and the default password is NI. You do not need to input

values for Comments or Current Calibrator Value.

4. Determine the value of the NI PXIe-7865/7866 device onboard reference by completing

the following steps.

a) Call nirio78xxCalibrationAdjustExtCal.vi. Set the Action to

CalibrateOnboardReference and pass the Current Calibrator Value of 0 V to

the VI for the first iteration. nirio78xxCalibrationAdjustExtCal.vi then

performs measurements and determines a new Requested Calibrator Value.

b) Program the calibrator to output the Requested Calibrator Value. At this point, you

must wait to ensure that the calibrator output has settled completely.

c) Repeat steps a and b until the Reference Calibration Done output becomes TRUE.

With each new iteration of these steps, input the Requested Calibrator Value returned

from the previous iteration.

5. Adjust the NI PXIe-7865/7866 device external calibration constants by calling

nirio78xxCalibrationAdjustExtCal.vi. Set the Action to

AdjustCalibration.

6. Save the calibration adjustment values to the onboard flash memory using

nirio78xxCalibrationAdjustExtCal.vi. Set the Action to CommitAndClose.

a) If you would prefer to cancel the calibration, you call this VI and set the Action to

CancelandClose. A comment input is provided for storing any comments related

to your calibration.

7. Disconnect the calibrator from the device.

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 the

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

8| ni.com | NI PXIe-7865 and NI PXIe-7866 Calibration Procedure

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 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, USA. For up-to-date contact information for your location, visit ni.com/contact.

NI PXIe-7865 and NI PXIe-7866 Calibration Procedure | © National Instruments | 9

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.

378236A-01 April 9, 2020

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