National Instruments PXI Manual de usuario

CALIBRATION PROCEDURE

NI 5114

This document contains instructions for writing an external calibration procedure for the

NI PXI/PXIe/PCI-5114. For more information about calibration, visit ni.com/

calibration.

Contents

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

Documentation.......................................................................................................................... 3

Password................................................................................................................................... 4

Calibration Interval................................................................................................................... 4

External Calibration.......................................................................................................... 4

Self-Calibration ................................................................................................................4

Test Equipment......................................................................................................................... 4

Calibration Procedures ............................................................................................................. 5

Initial Setup....................................................................................................................... 5

Test Conditions......................................................................................................... 5

Self-Calibration ................................................................................................................6

MAX......................................................................................................................... 6

NI-SCOPE Soft Front Panel ..................................................................................... 6

NI-SCOPE ................................................................................................................ 7

Verification ....................................................................................................................... 8

Vertical Offset and Vertical Gain Accuracy............................................................. 8

Programmable Vertical Offset Accuracy ................................................................. 18

Timing Accuracy ...................................................................................................... 24

Bandwidth and Flatness............................................................................................ 27

Trigger Sensitivity .................................................................................................... 32

Adjustment........................................................................................................................ 37

Appendix A: Calibration .......................................................................................................... 41

Complete Calibration........................................................................................................ 41

Appendix B: Calibration Utilities............................................................................................. 42

MAX................................................................................................................................. 42

NI-SCOPE ........................................................................................................................43

Where to Go for Support .......................................................................................................... 43

2|ni.com |NI 5114 Calibration Procedure

Software

To calibrate the NI 5114, install the following versions of NI-SCOPE.

You can download NI-SCOPE from the Instrument Driver Network at ni.com/idnet.

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 5114.

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 Function

Reference Help or the NI-SCOPE LabVIEW 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 for NI 5114 Calibration

Device NI-SCOPE Version

NI PXI-5114 2.9 or later

NI PCI-5114 3.1 or later

NI PXIe-5114 14.1 or later

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.

LabVIEW (

version

)\examples\

instr\niScope

Directory of LabVIEW NI-SCOPE example VIs,

including self-calibration.

LabVIEW (

version

instr.lib\niScopeCalibrate\

niScopeCal.llb

LabVIEW VI library containing VIs for calling the

NI-SCOPE calibration API.

NI 5114 Calibration Procedure |© National Instruments |3

Documentation

Consult the following documents for information about the NI PXI/PXIe/PCI-5114, NI-SCOPE,

and your application software. All documents are available on ni.com, and the Help files install

with the software.

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.

NI High-Speed Digitizers Getting Started Guide

Contains: NI-SCOPE installation, hardware installation, and hardware programing

NI 5114 Specifications

Contains: NI PXI/PXIe/PCI-5114 specifications and calibration interval

NI-SCOPE Readme

Contains: Operating system and application software support in NI-SCOPE

NI High-Speed Digitizers Help

Contains: Detailed information about NI PXI/PXIe/PCI-5114

NI-SCOPE LabVIEW Reference Help

Contains: LabVIEW programming concepts and reference information about NI-SCOPE VIs

and functions

NI-SCOPE Function Reference Help

Contains: Reference information for NI-SCOPE C functions and NI-SCOPE C properties

Table 2. Calibration File Locations after Installing NI-SCOPE (Continued)

File Name and Location Description

4|ni.com |NI 5114 Calibration Procedure

Password

The default calibration password is NI.

Calibration Interval

External Calibration

The measurement accuracy requirements of your application determine how often you should

externally calibrate the NI 5114. 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 or the requirements of your processes. Refer to Appendix A:

Calibration for more information.

Self-Calibration

Self-calibration can be performed as necessary to compensate for environmental changes.

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

NI 5114 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 5114. If you do not have

the recommended instruments, use these specifications to select a substitute calibration standard.

Note The delay times indicated in this procedure apply specifically to the

Fluke 9500B calibrator. If you use a different calibrator, you may need to adjust these

delay times.

Table 3. Required Equipment Specifications for the NI 5114 External Calibration

Required

Equipment

Recommended

Equipment

Parameter

Measured Specification

Signal

Generator

Fluke 9500B

Oscilloscope Calibrator

Wavetek 9500

(with high-stability

reference option)

Fluke 9510 Test Head

DC Accuracy DC ±(0.025% + 25 µV) into

1MΩ

Bandwidth,

Trigger

Sensitivity

±2% output amplitude

flatness for leveled sine wave

up to 125 MHz relative to

50 kHz into 50 Ω

Timing ±2 ppm frequency accuracy

BNC cable — — 50 Ω

NI 5114 Calibration Procedure |© National Instruments |5

Calibration Procedures

The calibration process includes the following steps:

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

(MAX).

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.

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.

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 device, or use a

short 50 ΩBNC coaxial cable if necessary. Long cables and wires act as antennas, picking

up extra noise that can affect measurements.

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

hardware documentation for the optimum relative humidity.

• Maintain an ambient temperature of 23 ±5 °C. The device temperature will be greater than

the ambient temperature.

• Allow a warm-up time of at least 15 minutes after the NI-SCOPE driver is loaded. Unless

manually disabled, the NI-SCOPE driver automatically loads with the operating system and

enables the device. The warm-up time ensures that the measurement circuitry of the

NI 5114 is at a stable operating temperature.

• Plug the PXI/PXI Express chassis or PC and the calibrator into the same power strip to

avoid ground loops.

•(PXI/PXIe) Ensure that the PXI/PXI Express chassis fan speed is set to HIGH, the fan filters

are removed, and the empty slots contain PXI chassis slot blockers and filler panels. For

more information refer to the Maintain Forced-Air Cooling Note to Users document

available at ni.com/manuals.

• Verify that all connections to the device, including front panel connections, are secure.

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

eliminate noise and thermal offsets.

6|ni.com |NI 5114 Calibration Procedure

Self-Calibration

The NI 5114 includes precise internal circuits and references used during self-calibration to

adjust for time and temperature drift. The device gain, offset, flatness, and trigger timing are all

corrected in self-calibration. Measuring the accuracy of these internal calibration circuits with

another instrument during external calibration provides traceability for the verification

procedure. Absolute accuracy is ensured by compensating for any error measured in the internal

references.

Note Self-calibrate the device 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

Note The device must be installed in MAX before it can be used in another

program.

MAX

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

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

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 Soft Front Panel

To initiate self-calibration from the NI-SCOPE Soft Front Panel (SFP), complete the following

steps:

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

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

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

3. Select the device you want to calibrate from the Select Device dialog box. The Select

Device dialog box automatically opens when you launch the NI-SCOPE SFP.

Note To change the device, select Edit»Change Device, and select the new device

that you want to calibrate.

NI 5114 Calibration Procedure |© National Instruments |7

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 5114 programmatically using NI-SCOPE, complete the following steps:

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

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

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

LabVIEW input values.

3. Self-calibrate the device 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 device.

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_CalSelf

Calibrate with the

following parameters:

sessionHandle: The

instrument handle from

niScope_init

channelList: VI_NULL

option: VI_NULL

8|ni.com |NI 5114 Calibration Procedure

4. End the session using the niScope Close VI.

Verification

Note After the 15-minute warm-up time, always self-calibrate the NI 5114 before

beginning a verification procedure.

This section describes the program you must write to verify either the calibration test limits or

the published specifications for the NI 5114.

Note If any of these tests fail after you perform an external adjustment, make sure

that you have met the requirements listed in the Test Equipment and Calibration

Procedures sections before you return the device to National Instruments for repair.

Vertical Offset and Vertical Gain Accuracy

Table 4 contains the input parameters for verifying both vertical offset accuracy and vertical gain

accuracy of the NI 5114.

To verify vertical offset accuracy, complete the procedures described in the Vertical Offset

Accuracy section for each of the 20 iterations listed in Table 4 for channel 0, then repeat the

procedures for channel 1. The Calibration Test Limits and Published Specifications for vertical

offset accuracy are shown in Table 5.

To verify vertical gain accuracy, complete the procedures described in the Vertical Gain

Accuracy section for each of the 20 iterations listed in Table 7 for channel 0; then repeat the

procedures for channel 1. The Calibration Test Limits and Published Specifications for vertical

gain accuracy are shown in Table 6.

LabVIEW VI C/C++ Function Call

Call niScope_close with the

following parameter:

vi: The instrument handle from

niScope_init

Table 4. NI 5114 Input Parameters for Vertical Offset Accuracy

and Vertical Gain Accuracy Verification

Iteration Max Input Frequency (MHz) Range

1 125 0.04

2 125 0.1

3 125 0.2

4 125 0.4

NI 5114 Calibration Procedure |© National Instruments |9

5 125 1

6 125 2

7 125 4

8 125 10

9 125 20

10 125 40

11 20 0.04

12 20 0.1

13 20 0.2

14 20 0.4

15 20 1

16 20 2

17 20 4

18 20 10

19 20 20

20 20 40

Table 4. NI 5114 Input Parameters for Vertical Offset Accuracy

and Vertical Gain Accuracy Verification (Continued)

Iteration Max Input Frequency (MHz) Range

10 |ni.com |NI 5114 Calibration Procedure

Vertical Offset Accuracy

Complete the following steps to verify vertical offset accuracy of the NI 5114. You must verify

both channels with each iteration listed in Table 5.

1. Open a session and obtain a session handle using the niScope Initialize VI.

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

LabVIEW input values.

2. Configure the input impedance and the maximum input frequency using the

niScope Configure Chan Characteristics VI.

LabVIEW VI C/C++ Function Call

Call niScope_init with the

following parameters:

resourceName: The device name

assigned by MAX

idQuery: VI_FALSE

resetDevice: VI_TRUE

LabVIEW VI C/C++ Function Call

Call

niScope_ConfigureChan

Characteristics with the

following parameters:

vi: The instrument handle from

niScope_init

channelList: "0"

inputImpedance:

NISCOPE_VAL_1_MEG_OHM

maxInputFrequency: The

Maximum Input Frequency

value in Table 5 for the current

iteration

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