National Instruments PXIe-5622 Handbuch

CALIBRATION PROCEDURE

NI 5622

This document contains instructions for writing an external calibration

procedure for National Instruments PXIe-5622 digitizers. This calibration

procedure is intended for metrology labs. For more information about

calibration, visit ni.com/calibration.

Contents

Conventions ............................................................................................ 2

Software Requirements ........................................................................... 3

Documentation Requirements................................................................. 4

Password ................................................................................................. 5

Calibration Interval ................................................................................. 5

External Calibration ......................................................................... 5

Self-Calibration................................................................................ 5

Test Equipment ....................................................................................... 5

Test Conditions ....................................................................................... 7

Calibration Procedures ............................................................................ 8

Initial Setup...................................................................................... 9

Self-Calibration................................................................................ 9

MAX......................................................................................... 9

NI-SCOPE SFP......................................................................... 9

NI-SCOPE ................................................................................ 10

Test Equipment Adjustment ............................................................ 11

Zero Power Meter..................................................................... 11

Power Splitter Amplitude Imbalance Correction ..................... 11

Verification ...................................................................................... 14

Absolute Amplitude Accuracy ................................................. 14

Bandpass Amplitude Flatness................................................... 21

Timing Accuracy ...................................................................... 30

SSB Phase Noise ...................................................................... 34

Average Noise Density............................................................. 42

Adjustment....................................................................................... 46

Appendix A: Calibration Utilities ........................................................... 51

MAX ................................................................................................ 51

NI-SCOPE ....................................................................................... 52

Where to Go for Support......................................................................... 52

NI 5622 Calibration Procedure 2 ni.com

Conventions

The following conventions are used in this document:

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

to a final action. The sequence Options»Settings»General directs you to

pull down the Options menu, select the Settings item, and select General

from the last dialog box.

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

This icon denotes a caution, which advises you of precautions to take to

avoid injury, data loss, or a system crash.

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.

Platform Text in this font denotes a specific platform and indicates that the text

following it applies only to that platform.

©National Instruments Corporation 3 NI 5622 Calibration Procedure

Software Requirements

Calibrating the NI 5622 requires installing the following software on the

calibration system.

You can download NI-SCOPE from the National Instruments web site at

ni.com/updates. NI-SCOPE supports programming the

Self-Calibration and Verification sections in a number of programming

languages; however, only LabVIEW and C are supported for the

Adjustment section.

NI-SCOPE includes all the functions and attributes necessary

for calibrating the NI 5622. LabVIEW support is installed in

niScopeCal.llb, and all calibration functions appear in the function

palette. For LabWindows™/CVI™, the NI-SCOPE function panel

niScopeCal.fp provides further help on the functions available in CVI.

Refer to Table 2 for installed file locations.

Calibration functions are LabVIEW VIs or C function calls in the

NI-SCOPE driver. The C function calls are valid for any compiler capable

of calling a 32-bit DLL. Many of the functions use constants defined in

the niScopeCal.h file. To use these constants in C, you must include

niScopeCal.h in your code when you write the calibration procedure.

For more information on the calibration VIs and functions, refer to the

NI-SCOPE LabVIEW Reference Help or the NI-SCOPE Function

Reference Help. These references can be found in the NI High-Speed

Digitizers Help. Refer to the NI-SCOPE Readme for the installed locations

of these documents.

Table 1. Required Software Specifications for NI 5622 Calibration

LabVIEW LabWindows/CVI and C/C++

NI-SCOPE 3.5 or later NI-SCOPE 3.5 or later

NI LabVIEW Digital Filter

Design Toolkit 8.2.1 or later

NI Modulation Toolkit for

LabWindows/CVI 2.0 or later

NI Modulation Toolkit for

LabVIEW 3.0 or later —

NI 5622 Calibration Procedure 4 ni.com

Documentation Requirements

You may find the following documentation helpful as you write your

calibration procedure:

• NI High-Speed Digitizers Getting Started Guide

• NI High-Speed Digitizers Help

–NI-SCOPE LabVIEW Reference Help (NI-SCOPE VIs and

NI-SCOPE Properties)

–NI-SCOPE Function Reference Help

• NI PXIe-5622 Specifications

These documents are installed with NI-SCOPE. You can also download

the latest versions from ni.com/manuals.

Table 2. Calibration File Locations after Installing NI-SCOPE

File Name and Location Description

IVI\Bin\niscope_32.dll NI-SCOPE driver containing the entire

NI-SCOPE API, including calibration functions

IVI\Lib\msc\niscope.lib NI-SCOPE library for Microsoft C containing

the entire NI-SCOPE API, including calibration

functions

\examples\instr\niScope Directory of LabVIEW NI-SCOPE example

VIs, including self-calibration.

\instr.lib\niScope\

Calibrate\niScopeCal.llb

LabVIEW VI library containing VIs for calling

the NI-SCOPE calibration API.

IVI\Drivers\niScope\niScopeCal.fp CVI function panel file that includes external

calibration function prototypes and information

about using NI-SCOPE in the CVI environment.

IVI\Include\niScopeCal.h Calibration header file, which you must include

in any C program accessing calibration

functions. This file automatically includes

niScope.h, which defines the rest of the

NI-SCOPE interface.

IVI\Drivers\niScope\Examples Directory of NI-SCOPE examples for CVI, C,

Visual C++, and Visual Basic.

©National Instruments Corporation 5 NI 5622 Calibration Procedure

Password

A password is required to open an external calibration session. If the

password has not been changed since manufacturing, the password is NI.

Calibration Interval

External Calibration

The measurement accuracy requirements of your application determine

how often you should externally calibrate the NI 5622. NI recommends

that you perform a complete external calibration at least once every year.

You can shorten this interval based on the accuracy demands of your

application.

Self-Calibration

You can perform self-calibration whenever necessary to compensate for

environmental changes.

Caution Although you can repeatedly self-calibrate, self-calibrating the NI 5622 more

than a few times a day may cause excessive wear on the relays over time.

Test Equipment

Table 3 lists the equipment required for externally calibrating the NI 5622.

If you do not have the recommended instruments, use these specifications

to select a substitute calibration standard.

NI 5622 Calibration Procedure 6 ni.com

Table 3. Required Equipment Specifications for NI 5622 External Calibration

Required

Equipment

Recommended

Equipment

Calibration

Procedure Specification

Signal

Generator

Rohde and

Schwarz

SMA-B103 with

SMA-B22 option,

enhanced phase

noise performance

SSB Phase

Noise Carrier

Frequency

Carrier Offset

100 Hz 1 kHz 10 kHz

53 MHz –108

dBc/Hz

–146

dBc/

–158

dBc/

187 MHz –98

dBc/Hz

–135

dBc/

–148

dBc/

Bandpass

Amplitude

Flatness,

Absolute

Amplitude

Accuracy,

SSB Phase

Noise, Timing

Accuracy,

Adjustment

Frequency Range: 900 kHz to 820 MHz

Power Measurement Level Setting Range:

–4 dBm to 10 dBm

Timing

Accuracy,

Adjustment

±0.1 ppm frequency accuracy

Power

Meter

Rohde and

Schwarz

NRP-Z91 with

NRP-Z4 USB

adapter

Absolute

Amplitude

Accuracy,

Bandpass

Amplitude

Flatness,

Adjustment

Frequency Range:

900 kHz to 820 MHz

Power Measurement Range:

–4 dBm to 3 dBm

Maximum VSWR:

1.11 (23 ±5 °C)

Absolute Power Measurement Uncertainty:

0.1 dB (23 ±5 °C)

Relative Power Measurement Uncertainty:

0.05 dB (23 ±5 °C)

©National Instruments Corporation 7 NI 5622 Calibration Procedure

Test Conditions

Follow these guidelines to optimize the connections and the environment

during calibration:

• Keep cables as short as possible. Long cables act as antennae, picking

up noise that can affect measurements.

• Verify that all connections, including front panel connections, are

secure.

SMA Cable Mini-Circuits

CBL-1.5FT-SMS

M+

Bandpass

Amplitude

Flatness,

Absolute

Amplitude

Accuracy,

SSB Phase

Noise, Timing

Accuracy,

Adjustment

50 Ω, Maximum VSWR: 1.20

Frequency Range: 900 kHz to 820 MHz

Power Measurement Range:

–4 dBm to 3 dBm

Relative Shielding: –100 dB

Attenuator Mini-Circuits

VAT- 3 +

SSB Phase

Noise

Frequency Range: 900 kHz to 820 MHz

Minimum Power (W): 10 mW

Maximum VSWR: 1.20

Nominal Attenuation: 3 dB

SMA

Termination

Mini-Circuits

ANNE-50+

Average

Noise Density

50 Ω

Power

Splitter

Weinschel

WA1507R

Absolute

Amplitude

Accuracy,

Bandpass

Amplitude

Flatness,

Adjustment

Frequency Range: 900 kHz to 820 MHz

Input Power Range: –4 dBm to 3 dBm

Maximum VSWR (Output ports): 1.15

Maximum Amplitude Tracking: 0.15 dBm

Table 3. Required Equipment Specifications for NI 5622 External Calibration (Continued)

Required

Equipment

Recommended

Equipment

Calibration

Procedure Specification

NI 5622 Calibration Procedure 8 ni.com

• Ensure that the PXIe chassis fan speed is set to HIGH, that the fan

filters are clean, and that the empty slots contain filler panels. For more

information, refer to the Maintain Forced-Air Cooling Note to Users,

available at ni.com/manuals.

• Keep relative humidity between 10% and 90% noncondensing, or

consult the NI PXIe-5622 Specifications for the optimum relative

humidity.

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

• Allow a warm-up time of at least 15 minutes after the NI-SCOPE

driver is loaded. Unless manually disabled, NI-SCOPE automatically

loads with the operating system and enables the device. The warm-up

time ensures that the measurement circuitry of the digitizer is at a

stable operating temperature.

• Plug the PXI Express chassis and the test equipment into the same

power strip to avoid ground loops.

Calibration Procedures

The calibration process includes the following steps.

1. Initial Setup—Install the device and configure it in Measurement &

Automation Explorer (MAX).

Note Allow a 15-minute warm-up time before beginning self-calibration.

2. Self-Calibration—Adjust the self-calibration constants of the device.

3. Test Equipment Adjustment—Zero the power meter and calculate

power splitter imbalance.

4. Verification—Verify the existing operation of the device. This step

confirms whether the device is operating within its specified range

prior to calibration.

5. Adjustment—Perform an external adjustment of the device that adjusts

the calibration constants with respect to a known voltage source. The

adjustment procedure automatically stores the calibration date on the

EEPROM to allow traceability.

6. Reverification—Repeat the verification procedure to ensure that the

device is operating within its specifications after adjustment.

These steps are described in more detail in the following sections.

©National Instruments Corporation 9 NI 5622 Calibration Procedure

Initial Setup

Refer to the NI High-Speed Digitizers Getting Started Guide for

information about how to install the software and hardware and how

to configure the device in MAX.

Self-Calibration

The NI 5622 includes precise internal circuits and references used during

self-calibration to adjust for time and temperature drift.

Note Allow a 15 minute warm-up period before you begin self-calibration.

Note Always self-calibrate the digitizer before you perform verification. NI-SCOPE

includes self-calibration example programs for LabVIEW, CVI, and Microsoft Visual C.

You can initiate self-calibration using the following methods:

•MAX

• NI-SCOPE Soft Front Panel (SFP)

•NI-SCOPE

MAX

To initiate self-calibration from MAX, complete the following steps:

1. Disconnect or disable any AC inputs to the digitizer.

2. Launch MAX.

3. Expand My System»Devices and Interfaces»PXI System.

4. Select the device that you want to calibrate.

5. Initiate self-calibration using one of the following methods:

•ClickSelf-Calibrate in the upper right corner of MAX.

• Right-click the name of the device in the MAX configuration tree

and select Self-Calibrate from the drop-down menu.

NI-SCOPE SFP

To initiate self-calibration from the NI-SCOPE SFP, complete the

following steps:

1. Disconnect or disable any AC inputs to the digitizer.

2. Launch the NI-SCOPE SFP, which is available at Start»All Programs»

National Instruments»NI-SCOPE»SCOPE Soft Front Panel.

3. Select the device you want to calibrate using the Device Configuration

dialog box by selecting Edit»Device Configuration.

NI 5622 Calibration Procedure 10 ni.com

4. Launch the Calibration dialog box by selecting Utility»

Self Calibration.

5. Click OK to begin self-calibration.

NI-SCOPE

To self-calibrate the NI 5622 programmatically using NI-SCOPE,

complete the following steps:

1. Disconnect or disable any AC inputs to the digitizer.

Note Throughout the procedure, refer to the C/C++ function call parameters for the

LabVIEW input values.

2. Open a session and obtain a session handle using the niScope

Initialize VI.

3. Self-calibrate the digitizer using niScope Cal Self Calibrate VI.

Note Because the session is a standard session rather than an external calibration session,

the new calibration constants are immediately stored in the EEPROM. Therefore, you can

include this procedure in any application that uses the digitizer.

LabVIEW VI C/C++ Function Call

Call niScope_init with the following

parameters:

vi: The returned session handle that you use to

identify the instrument in all subsequent

NI-SCOPE driver function calls

resourceName: The device name assigned by

MAX

idQuery: VI_FALSE

resetDevice: VI_TRUE

LabVIEW VI C/C++ Function Call

Call niScope_CalSelfCalibrate with

the following parameters:

sessionHandle: The instrument handle from

niScope_init

channelList: VI_NULL

option: VI_NULL

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