National Instruments PXI-5152 Handbuch

CALIBRATION PROCEDURE

NI 5152/5153/5154

This document contains instructions for writing an external calibration

procedure for National Instruments PXI/PCI-5152/5153/5154 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...................................................................................... 8

Self-Calibration................................................................................ 8

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

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

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

Verification ...................................................................................... 11

Vertical Offset and Vertical Gain Accuracy............................. 11

Programmable Vertical Offset Accuracy (NI 5152 Only)........ 23

Timing Accuracy ...................................................................... 28

Bandwidth................................................................................. 34

Trigger Accuracy ...................................................................... 44

Trigger Sensitivity .................................................................... 55

Adjustment....................................................................................... 59

Appendix A: Calibration Options ........................................................... 64

Complete Calibration....................................................................... 65

Optional Calibration ........................................................................ 66

NI 5450 Calibration Procedure 2 ni.com

Appendix B: Calibration Utilities............................................................68

MAX.................................................................................................68

NI-SCOPE ........................................................................................68

Where to Go for Support .........................................................................69

Conventions

The following conventions appear in this manual:

»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.

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 5450 Calibration Procedure

Software Requirements

Calibrating the NI 5152/5153/5154 requires installing the following

versions of NI-SCOPE on the calibration system.

You can download NI-SCOPE from the Instrument Driver Network at

ni.com/idnet. NI-SCOPE supports programming the Self-Calibration

section and Verification section 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 5152/5153/5154. 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 1 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 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.

Device NI-SCOPE Version

NI PXI-5152 3.2 or later

NI PCI-5152 3.3 or later

NI PXI/PCI-5153/5154 3.5 or later

NI 5450 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 PXI/PCI-5152 Specifications

• NI 5153/5154 Specifications

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

NI-SCOPE Properties)

•NI-SCOPE Function Reference Help

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

the latest versions from ni.com/manuals.

Table 1. 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 help on

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 5450 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 5152/5153/5154.

NI recommends that you perform a complete external calibration at least

once every two years. You can shorten this interval based on the accuracy

demands of your application. Refer to Appendix A: Calibration Options

for more information.

Self-Calibration

Self-calibration can be performed whenever necessary to compensate for

environmental changes.

Caution Although you can use self-calibration repeatedly, self-calibrating the

NI 5152/5153/5154 more than a few times a day may cause excessive wear on the relays

over time.

Test Equipment

Table 2 lists the equipment required for externally calibrating the

NI 5152/5153/5154. If you do not have the recommended instruments,

use these specifications to select a substitute calibration standard.

NI 5450 Calibration Procedure 6 ni.com

Table 2. Required Equipment Specifications for NI 5152/5153/5154 External Calibration

Required

Equipment

Recommended

Equipment

Parameter

Measured Specification

Signal

Generator

NI 5152/5153:

Fluke 9500B

oscilloscope

calibrator

Wavetek 9500

with

high-stability

reference

option

Fluke 9510

Test Head

NI 5154:

Fluke

9500B/1100

oscilloscope

calibrator

Wavetek

9500/1100 with

high-stability

reference option

Fluke 9510 Test

Head

Accuracy

DC ±(0.025% + 25 μV)

into 1 MΩor 50 Ω

Bandwidth,

Trigger

Sensitivity

NI 5152:

±2% output amplitude

flatness for leveled sine

wave up to 300 MHz

relative to 50 kHz into

50 Ω

NI 5153:

±3% output amplitude

flatness for leveled sine

wave up to 500 MHz

relative to 50 kHz into

50 Ω

NI 5154:

±4% output amplitude

flatness for leveled sine

wave up to 1100 MHz

relative to 50 kHz into

50 Ω

Timing ±2 ppm frequency

accuracy

NI 5402 Function Generator

Agilent 33220A Function Generator

Trigger

Accuracy

±5% output amplitude

flatness for leveled sine

wave up to 10 Vpk-pk and

11 MHz relative to

50 kHz into 50 Ω

(3) BNC Cables — — 50 Ω, identical in length

and cable material

©National Instruments Corporation 7 NI 5450 Calibration Procedure

Note The delay times indicated in this procedure apply specifically to the Fluke 9500B/

Wavetek 9500 calibrator. If you use a different instrument, you may need to adjust these

delay times.

Test Conditions

Follow these guidelines to optimize the connections and the environment

during calibration:

• Always connect the calibrator test head directly to the input BNC of

the digitizer, or use a short 50 ΩBNC coaxial cable if necessary. Long

cables and wires act as antennae, picking up extra noise that can affect

measurements.

• Keep relative humidity between 10 and 90% non-condensing, or

consult the digitizer hardware 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.

For PXI digitizers:

• Ensure that the PXI 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,

which is available at ni.com/manuals.

• Plug the PXI chassis and the calibrator into the same power strip to

avoid ground loops.

BNC Power

Splitter

Mini-Circuits Power Splitter

ZSC 2-1+

Trigger

Accuracy

Insertion Loss:

< 4 dB at 10 MHz

Amplitude Imbalance:

0.2 dB

BNC

Feedthrough

Terminator

Pomona 4119 BNC Feedthrough

Terminator

Trigger

Accuracy

50 Ω

Frequency Range:

DC to 10.1 MHz

VSWR: 1.1 at 10 MHz

Table 2. Required Equipment Specifications for NI 5152/5153/5154 External Calibration (Continued)

Required

Equipment

Recommended

Equipment

Parameter

Measured Specification

NI 5450 Calibration Procedure 8 ni.com

For PCI digitizers:

• Plug the PC and the calibrator 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. Verification—Verify the existing operation of the device. This step

confirms whether the device is operating within its specified range

prior to calibration.

4. 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.

5. 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.

Note In some cases, the complete calibration procedure may not be required. Refer to

Appendix A: Calibration Options for more information.

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 5152/5153/5154 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 Self-calibrate the digitizer before you perform verification. NI-SCOPE includes

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

©National Instruments Corporation 9 NI 5450 Calibration Procedure

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. Select My System»Devices and Interfaces»NI-DAQmx Devices.

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 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.

4. Launch the Calibration dialog box by selecting Utility»

Self Calibration.

5. Click OK to begin self-calibration.

NI-SCOPE

To self-calibrate the digitizer 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.

NI 5450 Calibration Procedure 10 ni.com

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.

4. End the session using the niScope Close VI.

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

LabVIEW VI C/C++ Function Call

Call niScope_close with the following

parameters:

vi: The instrument handle from niScope_init

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