National Instruments NI PXI-665 Series Handbuch

CALIBRATION PROCEDURE

NI PXI-665x

This document describes how to write a calibration procedure for the

10 MHz oscillator frequency of the NI PXI-6653 and NI PXI-6652 timing

and synchronization modules.

Contents

Conventions ............................................................................................ 1

Software .................................................................................................. 2

Documentation ........................................................................................ 2

Calibration Interval ................................................................................. 3

Password ................................................................................................. 3

Test Equipment ....................................................................................... 3

Test Conditions ....................................................................................... 3

Calibration Procedure ............................................................................. 4

Initial Setup...................................................................................... 4

Verification ...................................................................................... 4

Connecting the Clock Source ................................................... 4

Measuring the Frequency ......................................................... 6

Adjustment....................................................................................... 10

Reverification................................................................................... 13

Where to Go for Support......................................................................... 14

Conventions

The following conventions apply to this document:

»The »symbol leads you through nested menu items and dialog box options

to a final action. The sequence File»Page Setup»Options directs you to

pull down the File menu, select the Page Setup item, and select Options

from the last dialog box.

This icon denotes a note, which alerts you to important information.

When symbol is marked on a product, it denotes a warning advising you to

take precautions to avoid electrical shock.

NI PXI-665x Calibration Procedure 2 ni.com

When symbol is marked on a product, it denotes a component that may be

hot. Touching this component may result in bodily injury.

bold Bold text denotes items that you must select or click in the software, such

as menu items and dialog box options. Bold text also denotes parameter

names.

italic Italic text denotes variables, emphasis, a cross-reference, or an introduction

to a key concept. Italic text also denotes text that is a placeholder for a word

or value that you must supply.

monospace Text in this font denotes text or characters that you should enter from the

keyboard, sections of code, programming examples, and syntax examples.

This font is also used for the proper names of disk drives, paths, directories,

programs, subprograms, subroutines, device names, functions, operations,

variables, filenames, and extensions.

Software

This calibration procedure requires NI-Sync and NI-VISA. NI-Sync and

NI-VISA support a number of application development environments

(ADEs) and programming languages, including LabVIEW,

LabWindows™/CVI™, and Microsoft Visual C++. When you install the

drivers, you need to install support for only the ADE or programming

language you are using. The illustrations in this document show the

LabVIEW code for implementing calibration steps using NI-Sync and

NI-VISA.

Documentation

You need the NI-Sync User Manual to calibrate the NI PXI-665x.

The NI-Sync User Manual contains detailed information about using

the NI-Sync driver, including information about installing NI-Sync and

creating applications that use the NI-Sync driver. These sources, along with

this document, are your primary references for writing your calibration

utility. You also can refer to the documentation for the programming

language or application development environment you are using. For

further information about the device you are calibrating, refer to the

NI PXI-665x User Manual.

©National Instruments Corporation 3 NI PXI-665x Calibration Procedure

Calibration Interval

The measurement requirements of the application determine how often you

should calibrate the device to ensure its accuracy. National Instruments

recommends that you calibrate the NI PXI-6653 and NI PXI-6652 yearly.

You may want to shorten this interval based on the application demands.

Password

The default password for password-protected operations is NI.

Test Equipment

Calibrating the NI PXI-665xrequires the following equipment.

Test Conditions

Follow these guidelines to optimize connections and test conditions during

the calibration procedure:

• Install the NI PXI-665xin Slot 2 of the PXI chassis. The calibration

procedure requires features of PXI that are accessible only in slot 2.

Use of an NI PXI-1044 or NI PXI-1045 chassis is recommended to

reduce error associated in variance in the 5 V chassis supply.

• Maintain a temperature of approximately 25 °C.

• Keep relative humidity below 80 percent.

• Use shielded copper wire for all cable connections to the device.

• Allow a warm up time of at least 15 minutes for the NI PXI-6652 and

three hours for the NI PXI-6653 to ensure the measurement circuitry is

at a stable operating temperature.

• Keep PXI chassis filters clean and fan speed set to High.

Equipment Recommended Model Requirements

10 MHz clock source Symmetricom/Datum 8040 Accurate to within

0.75 parts-per-billion (ppb) for the

NI PXI-6653, or 150 ppb for the

NI PXI-6652.

BNC-SMB cable — —

SMB-SMB cable — —

NI PXI-665x Calibration Procedure 4 ni.com

Calibration Procedure

The steps used in the calibration procedure are as follows:

1. Initial setup.

2. Verification.

3. Adjustment.

4. Reverification.

Initial Setup

Complete the following steps to set up the NI PXI-665xfor calibration.

1. Make sure all components involved in the calibration procedure are

powered off.

2. Install the NI PXI-665xboard into slot 2 of your chassis.

Note The module must be installed in slot 2 of the chassis.

3. Power on the PXI chassis first, and then the external equipment.

4. Make sure that all the appropriate driver and application software is

installed on the host computer.

5. Configure the hardware properly with Measurement & Automation

Explorer (MAX). Refer to the NI PXI-665x Installation Guide for

details about configuring the PXI equipment.

Verification

The following steps outline the procedure for measuring the 10 MHz

oscillator frequency on the NI PXI-665xand determining whether the

device requires adjustment to meet the published specifications.

Connecting the Clock Source

1. Connect the accurate 10 MHz source to the ClkIn connector on the

NI PXI-665x.

2. Program the NI PXI-665xto route the ClkIn signal to PXI_Clk10In

without using its 10 MHz PLL by completing steps a–d.

Note Use the data in the C function call reference as inputs to your LabVIEW VI where

applicable.

©National Instruments Corporation 5 NI PXI-665x Calibration Procedure

a. Call niSync Initialize VI to set up a handle for the device.

b. Set a writable NI-Sync property node to pass FALSE to the

Use PLL? attribute.

c. Call niSync Connect Clock Terminals VI to connect ClkIn to

PXI_Clk10_In.

LabVIEW Block Diagram NI-SYNC C Function Call

Call niSync_init with the following

parameters:

resourceName: Dev1

idQuery: NULL

resetDevice: VI_TRUE

vi: *SessionHandle

LabVIEW Block Diagram NI-SYNC C Function Call

Call niSync_SetAttributeViBoolean

with the following parameters:

vi: “<SessionHandle>”

terminalName: “”

attributeID:

NISYNC_ATTR_CLKIN_USE_PLL

attributeValue: VI_FALSE

LabVIEW Block Diagram NI-SYNC C Function Call

Call niSync_ConnectClkTerminals

with the following parameters:

vi: “<SessionHandle>”

sourceTerminal: NISYNC_VAL_CLKIN

destinationTerminal:

NISYNC_VAL_CLK10

NI PXI-665x Calibration Procedure 6 ni.com

d. Call niSync Close VI to close the handle.

Measuring the Frequency

Complete the following procedure to measure the frequency of the onboard

clock source.

1. Connect the ClkOut terminal to the PFI 0 terminal by using an

SMB-to-SMB cable.

2. Complete steps a–d to program the board to connect the onboard

oscillator to ClkOut. Be sure to use the high-gain setting for clock out.

a. Call niSync Initialize VI to set up a handle for the device.

b. Set a writable NI-Sync property node to pass TRUE to the ClkOut

Gain Enable attribute.

LabVIEW Block Diagram NI-SYNC C Function Call

Call niSync_close with the following

parameter:

vi: “<SessionHandle>”

LabVIEW Block Diagram NI-SYNC C Function Call

Call niSync_init with the following

parameters:

resourceName: Dev1

idQuery: NULL (ignored)

resetDevice: VI_FALSE

vi: *SessionHandle

LabVIEW Block Diagram NI-SYNC C Function Call

Call niSync_SetAttributeViBoolean

with the following parameters:

vi: “<SessionHandle>”

terminalName: “”

attributeID:

NISYNC_ATTR_CLKOUT_GAIN_ENABLE

attributeValue: VI_TRUE

©National Instruments Corporation 7 NI PXI-665x Calibration Procedure

c. Call niSync Connect Clock Terminals VI to connect the oscillator

to ClkOut.

d. Call niSync Close VI to close the session handle.

3. Complete steps a–c to measure the oscillator frequency through PFI 0.

To obtain an accurate measurement for calibration, the measurement

duration must be made sufficiently long. Refer to Table 1 for the

measurement duration to use.

LabVIEW Block Diagram NI-SYNC C Function Call

Call niSync_ConnectClkTerminals

with the following parameters:

vi: “<SessionHandle>”

sourceTerminal:

NISYNC_VAL_OSCILLATOR

destinationTerminal:

NISYNC_VAL_CLKOUT

LabVIEW Block Diagram NI-SYNC C Function Call

Call niSync_close with the following

parameter:

vi: “<SessionHandle>”

Table 1. Measurement Duration

Device Measure Accuracy

Required Measurement

Duration

NI PXI-6652 200 ppb 0.5 seconds

NI PXI-6653 1 ppb 100 seconds

NI PXI-665x Calibration Procedure 8 ni.com

a. Call niSync Initialize VI to set up a handle for the device.

b. Call niSync Measure Frequency VI to measure the frequency of

the oscillator.

c. Call niSync Close VI to close the session handle.

4. Compare the measured frequency to the device specifications.

LabVIEW Block Diagram NI-SYNC C Function Call

Call niSync_init with the following

parameters:

resourceName: Dev1

idQuery: NULL

resetDevice: VI_FALSE

vi: *SessionHandle

LabVIEW Block Diagram NI-SYNC C Function Call

Call niSync_MeasureFrequency with

the following parameters:

vi: “<SessionHandle>”

sourceTerminal:

NISYNC_VAL_OSCILLATOR

duration: 0.5 or 100

actualDuration: *actualDuration

measuredFrequency:

*measuredFrequency

error: *error

LabVIEW Block Diagram NI-SYNC C Function Call

Call niSync_close with the following

parameter:

vi: “<SessionHandle>”

©National Instruments Corporation 9 NI PXI-665x Calibration Procedure

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

compare the measured frequency obtained in step 3 of Measuring the

Frequency with the specified accuracy. Table 2 shows the frequency range

that is acceptable according to the published specifications for the

NI PXI-665x.

If the measured value is within the low-limit and high-limit range listed

under the Acceptable Frequency Range—As Left in Table 3, the board is

meeting published specifications for the 24 hour period following a

calibration.

Table 2. One Year Test Limits

Device

Specified

Accuracy +

Aging

Acceptable Frequency Range—As Found

Low Limit High Limit

NI PXI-6652

(TCXO)

± 3.5 ppm 9,999,965 Hz 10,000,035 Hz

NI PXI-6653

(OCXO)

± 57.6 ppb 9,999,999.424 Hz 10,000,000.576 Hz

Table 3. 24 Hour Test Limits

Device

Specified Initial

Accuracy

Acceptable Frequency Range—As Left

Low Limit High Limit

NI PXI-6652

(TCXO)

± 2.5 ppm 9,999,975 Hz 10,000,025 Hz

NI PXI-6653

(OCXO)

± 6.1 ppb 9,999,999.939 Hz 10,000,000.061 Hz

Table 4. Calibration Target Frequency Ranges

Device

Calibration

Measurement

Accuracy

Calibration Measurement Target

Frequency Range

Low Limit High Limit

NI PXI-6652

(TCXO)

200 ppb 9,999,998 Hz 10,000,002 Hz

NI PXI-6653

(OCXO)

1 ppb 9,999,999.99 Hz 10,000,000.01 Hz

NI PXI-665x Calibration Procedure 10 ni.com

If the measured value is within the low-limit and high-limit range listed

under the Calibration Measurement Target Frequency Range in Table 4,

the board is considered to be calibrated and no adjustment is needed.

Adjustment

If the accuracy of the 10 MHz oscillator is outside the specified range

for the product, the device is out of calibration. A programmable voltage

controls the oscillator frequency. By varying this voltage and precisely

measuring the frequency, you can find a voltage that gives a frequency as

close as possible to 10 MHz.

1. Complete steps a–c to set the oscillator control voltage. The range of

acceptable voltage values is 0.0 V to 4.095 V with frequency

increasing as voltage increases. Use a control voltage of 2.0475 V,

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

a. Call niSync Initialize VI to set up a handle for the device.

b. Set a writable NI-Sync property node to pass the constant 2.0475

to the Oscillator Voltage attribute.

LabVIEW Block Diagram NI-SYNC C Function Call

Call niSync_init with the following

parameters:

resourceName: Dev1

idQuery: NULL

resetDevice: VI_FALSE

vi: *SessionHandle

LabVIEW Block Diagram NI-SYNC C Function Call

Call niSync_SetAttributeViBoolean

with the following parameters:

vi: “<SessionHandle>”

terminalName: “”

attributeID:

NISYNC_ATTR_OSCILLATOR_VOLTAGE

attributeValue: 2.0475

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