National Instruments PXI EXPRESS PXIe-1095 Handbuch

CALIBRATION PROCEDURE

PXIe-1095

PXI Chassis

This document contains the verification and adjustment procedures for the National

Instruments PXIe-1095 chassis. Refer to ni.com/calibration for more information about

calibration solutions.

Contents

Software.................................................................................................................................... 1

Documentation..........................................................................................................................1

Test Equipment......................................................................................................................... 2

Test Conditions......................................................................................................................... 2

Initial Setup...............................................................................................................................2

Verification................................................................................................................................3

Adjustment................................................................................................................................4

Reverification............................................................................................................................5

Where to Go for Support.......................................................................................................... 5

Software

Calibrating the PXIe-1095 requires the installation of the following software on the calibration

system:

• PXI Platform Services 18.1 or later

You can download PXI Platform Services from ni.com/downloads.

PXI Platform Services supports programming the calibration procedures using a number of

application development environments (ADEs), including LabVIEW, LabWindows™/CVI™,

and Microsoft Visual C++. When you install PXI Platform Services, you need to install

support only for the ADE that you intend to use.

Documentation

You might find the following documents helpful as you perform the calibration procedure:

• PXIe-1095 User Manual

• PXIe-1095 Specifications

The latest versions of these documents are available on http://www.ni.com/manuals.

Test Equipment

The following table lists the equipment NI recommends for the performance verification and

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

using the minimum requirements listed in the table.

Table 1. Recommended Test Equipment

Equipment Recommended Models Minimum Requirements

Frequency Reference Symmetricom 8040C

Output Frequency: 10 MHz

Accuracy: ≤ 1×10-10

Frequency Counter Keysight 53220A

Frequency Range: >10 MHz

Frequency Resolution: ≤0.001 Hz at 10

MHz

BNC-BNC Cable — —

BNC-SMA Cable — —

Test Conditions

The following setup and environmental conditions are required to ensure the PXIe-1095

chassis meets published specifications.

• Keep cabling as short as possible. Long cables and wires act as antennae, picking up

extra noise that can affect measurements.

• Verify that all connections, including front panel connections and screws, are secure.

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

• Keep relative humidity below 80%.

• Ensure that the PXIe-1095 chassis has been continuously powered for at least 24 hours

prior to calibration to allow the 10 MHz oscillator frequency to stabilize.

• Ensure that the Frequency Reference has been continuously powered as specified by its

manual for its accuracy to meet the minimum requirements specified in Table 1. on page

Initial Setup

Refer to the PXIe-1095 User Manual for information about how to install the software and

hardware and how to configure the device in Measurement & Automation Explorer (MAX).

2| ni.com | PXIe-1095 Calibration Procedure

Verification

The performance verification procedure assumes that adequate traceable uncertainties are

available for the calibration references.

Complete the following procedure to determine the as-found status of the PXIe-1095 chassis.

Verifying OCXO Frequency Accuracy

1. Connect the 10 MHz Ref Out SMA on the rear of the PXIe-1095 chassis to Channel 1 of

the Frequency Counter.

2. Configure the Frequency Reference to output a 10 MHz sine wave on one of its output

channels. Connect this channel to the Ext Ref In port of the Frequency Counter.

3. Configure the Frequency Counter to use the Ext Ref In port as the reference oscillator

source and to use Channel 1 as its input source.

4. Measure the OCXO frequency using the Frequency Counter.

5. Compare the measured frequency to the device specifications.

To determine if the device under test meets its specifications, you must compare the measured

frequency with the published specifications. Table 2. on page 3 shows the frequency range

that is acceptable according to the published specifications of the PXIe-1095 chassis.

Table 2. One Year Test Limits

Device Specified Accuracy Within 1

Year of Calibration

Acceptable Frequency Range — As Found

Low Limit High Limit

PXIe-1095 ± 80×10-9 9,999,999.20 Hz 10,000,000.80 Hz

If the measured value is within the low-limit and high-limit range listed in Table 2. on page 3,

the chassis is operating in specification but requires adjustment to be considered calibrated. If

the measured value is outside the range listed in Table 2. on page 3, the chassis is operating

out of specification.

To determine if the device under test is already calibrated, you must compare the measured

frequency with the ranges listed in Table 3. on page 3.

Table 3. Adjustment Target Frequency Ranges (As-Left Limits)

Device Calibration Measurement

Accuracy

Acceptable Frequency Range — As Left

Low Limit High Limit

PXIe-1095 ±1×1099,999,999.99 Hz 10,000,000.01 Hz

PXIe-1095 Calibration Procedure | © National Instruments | 3

If the measured value is within the low-limit and high-limit range listed in Table 3. on page 3,

no adjustment is needed.

Note Test limits in Table 2. on page 3 are based on the PXIe-1095 specifications.

Refer to the most recent PXIe-1095 specifications online at ni.com/manuals.

Adjustment

Adjusting OCXO Frequency Accuracy

If the OCXO frequency accuracy is outside the specified range for the product, then the device

is out of calibration.

A programmable voltage controls the OCXO frequency. By using the NI System

Configuration API to vary this voltage and precisely measure the frequency, you can find a

voltage that gives a frequency as close as possible to 10 MHz.

Note You can use a binary search algorithm to find the optimal oscillator control

voltage. The PXIe-1095 uses a 16-bit digital-to-analog convertor (DAC) to create

the oscillator control voltage; therefore, you need 16 (at most) iterations of

adjustment and measurement to calibrate the 10 MHz oscillator.

Complete the following procedure to adjust the OCXO frequency accuracy of the PXIe-1095

chassis:

1. Get a resource handle for the PXIe-1095 to calibrate using the System Configuration API.

a. Call Initialize Session to set up a new session.

b. Call Create Filter to create a new filter for searching for devices. Set the IsChassis

and IsNI attributes of the filter to TRUE.

c. Find the chassis resource name of the PXIe-1095 to calibrate using Measurement &

Automation Explorer (MAX) and set the Alias attribute of the filter to match the

chassis resource name.

d. Call Find Hardware using the filter created in the previous steps. Set the Experts

parameter of this function to ni-pxi. This function returns an array with exactly

one element: the resource handle to the chassis. Check your filter settings if the

resource handle only is not returned.

2. Initialize the calibration process.

a. Using the resource handle obtained with Find Hardware, set the CalPasswd

property to the current calibration password for the chassis.

Note NI is the default calibration password.

b. Using the same resource handle, set the CalExtAction property to Start.

c. Call Save Changes to commit these changes to hardware.

4| ni.com | PXIe-1095 Calibration Procedure

3. Write a new value for the oscillator DAC value. The range of oscillator control voltage

values is 0 to 65535, with frequency increasing as the value increases. Use a DAC value

of 32768, which is in the middle of the valid range, as a starting point.

a. Using the same resource handle, set the DacValue property to the new DAC value.

b. Call Save Changes to commit these changes to hardware.

4. Measure the OCXO frequency following the steps in Verifying the OCXO Frequency

Accuracy.

5. Compare the measured frequency to the target frequency and repeat steps 3 and 4,

adjusting the oscillator DAC value up to increase the frequency and down to decrease the

frequency.

Note NI recommends that you implement a binary search to determine the

optimal DAC value. This requires going through 16 iterations, with

confirmation that the final DAC value measured crosses over the target

frequency when the DAC value is changed by 1 bit.

6. Compare the final measured frequency to the specified limits in Table 3. on page 3 to

confirm adjustment completed successfully.

7. If adjustment was successful, commit the calibration values to device memory. If

adjustment was unsuccessful, cancel the external adjustment action; the chassis may be in

need of repair.

a. Using the resource handle obtained in step 1c, set the CalExtAction property to

Commit (or Cancel if adjustment was unsuccessful).

b. Call Save Changes to commit these changes to hardware.

Reverification

Repeat the Verification section to determine the as-left status of the device. If the measured

value is within the low-limit and high-limit range listed in Table 3. on page 3, the chassis is

considered to be calibrated and no further adjustment is needed.

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 Where to

Go for Support for information about support resources or service requests.

Where to Go for Support

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.

National Instruments corporate headquarters is located at 11500 North Mopac Expressway,

Austin, Texas, 78759-3504. National Instruments also has offices located around the world to

help address your support needs. For telephone support in the United States, create your

service request at ni.com/support and follow the calling instructions or dial 512 795 8248. For

PXIe-1095 Calibration Procedure | © National Instruments | 5

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.

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.

377631A-01 December 13, 2018

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