National Instruments NI PXI-5422 User Manual

CALIBRATION PROCEDURE

NI PXI-5422

This document contains step-by-step instructions for writing a calibration procedure for the NI PXI-5422 arbitrary waveform generator.

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

Introduction.............................................................................................2

What Is Calibration? ........................................................................ 2

Self-Calibration ........................................................................ 2

External Calibration.................................................................. 2

Why Should You Calibrate? ............................................................ 2

How Often Should You Calibrate? .................................................. 3

Software and Documentation Requirements...........................................3

Software ........................................................................................... 3

Documentation.................................................................................5

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

MAX ................................................................................................ 5

FGEN Soft Front Panel.................................................................... 6

NI-FGEN ......................................................................................... 6

External Calibration Options .................................................................. 7

Complete Calibration....................................................................... 7

Optional Calibration ........................................................................ 9

External Calibration Requirements ......................................................... 11

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

Test Conditions ................................................................................ 11

External Calibration Procedures ............................................................. 12

Writing Your Calibration Procedure................................................12

Calibration Procedures in LabVIEW........................................ 12

Calibration Procedures in LabWindows/CVI ...........................12

Calibration Procedures in C......................................................12

Verifying NI PXI-5422 Specifications ............................................13

Verifying the Oscillator Frequency Accuracy.......................... 15

Verifying the DC Gain and Offset Accuracy ...........................17

Adjusting the NI PXI-5422.............................................................. 31

Initializing the External Calibration Session ............................35

Adjusting the Analog Output ....................................................35

Adjusting the Oscillator Frequency...........................................52

Adjusting the Calibration ADC.................................................55

Closing the External Adjustment Session.................................60

Calibration Utilities .................................................................................61

MAX.................................................................................................61

FGEN SFP........................................................................................61

NI-FGEN ..........................................................................................62

Where to Go for Support .........................................................................63

Conventions

The following conventions are used 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. When this symbol is marked on a product, refer to the Read Me First: Safety and Radio-Frequency Interference document for information about precautions to take.

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. This font 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.

Introduction

This document contains instructions for calibrating the NI PXI-5422 arbitrary waveform generator. This calibration procedure is intended for metrology labs. It describes specific programming steps for writing an external calibration procedure for the NI PXI-5422.

NI PXI-5422 Calibration Procedure 2 ni.com

What Is Calibration?

Calibration consists of verifying the output accuracy of a device and correcting for any output error. Verification is measuring the performance of a device and comparing the results to the specifications of the device. NI calibrates every NI PXI-5422 at the factory. During the factory calibration process, the calibration constants are stored in an onboard EEPROM. These values are loaded from this EEPROM and used as needed by the NI PXI-5422.

The NI PXI-5422 supports two types of calibration: self-calibration (or internal calibration) and external calibration.

Self-Calibration

Self-calibration, also known as internal calibration, uses a software command and requires no external connections. Self-calibration improves output accuracy by compensating for variables, such as temperature and time, that may have changed since the last external calibration. Self-calibration retains the traceability of the external calibration.

External Calibration

External calibration is generally performed at either NI or a metrology lab. This procedure replaces all calibration constants in the EEPROM and is equivalent to a factory calibration at NI. Because the external calibration procedure changes all EEPROM constants, it invalidates the original calibration certificate. If an external calibration is done with a traceable instrument, a new calibration certificate can be issued.

Why Should You Calibrate?

The accuracy of electronic components drifts with time and temperature, which can affect output accuracy as a device ages. Calibration verifies that the NI PXI-5422 still meets its specified accuracy and NI standards. If adjustments are necessary, calibration makes the adjustments to restore the accuracy.

How Often Should You Calibrate?

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

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

NI PXI-5422 more than a few times a day may cause excessive wear on the relays over time.

The output accuracy requirements of your application determine how often you should externally calibrate the NI PXI-5422. 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 the External Calibration Options section for more information.

Software and Documentation Requirements

This section describes the software and documentation required for both self-calibration and external calibration.

Software

Calibrating the NI PXI-5422 requires installing NI-FGEN version 2.2 or later on the calibration system. You can download NI-FGEN from the Instrument Driver Network at programming the Self-Calibration Procedures and the External

Calibration Procedures in the LabVIEW, LabWindows

application development environments (ADEs). When you install NI-FGEN, you only need to install support for the ADE that you intend to use.

NI-FGEN 2.2 or later includes all the functions and attributes necessary for calibrating the NI PXI-5422. For LabWindows/CVI, the NI-FGEN function panel ( LabVIEW support is in the appear in the function palette.

niFgen.fp) provides help about the functions available.

ni.com/idnet. NI-FGEN supports

niFgen.llb file, and all calibration functions

™

/CVI™, and C

Calibration functions are C function calls or LabVIEW VIs in NI-FGEN. In this document, the C function call is shown first, followed by the corresponding LabVIEW VI, or NI-FGEN LabVIEW property node, in parentheses. The C function calls are valid for any compiler capable of

NI PXI-5422 Calibration Procedure 4 ni.com

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

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

in your code when you write the calibration procedure. Refer to Table 1 for file locations.

Table 1. Calibration File Locations

File Name and Location Description

IVI\Bin\niFgen_32.dll The NI-FGEN library, which provides the

functionality for calibrating the NI PXI-5422.

IVI\Lib\msc\niFgen.lib Allows you to create applications that call

functions in the

niFgen_32.dll:

• For Microsoft Visual C/C++, link to

msc\niFgen.lib.

• For LabWindows/CVI, link to the library appropriate to your current compatibility mode (

msc for Microsoft Visual C/C++).

IVI\Include\niFgen.h A header file for the accessible functions in

the

niFgen_32.dll. You must include this

file in any C code that you write to call these functions.

<LabVIEW>\instr.lib\niFgen\niFgen.llb

(LabVIEW)

IVI\Drivers\niFgen\niFgen.fp

(CVI)

The calibration process is described in the Self-Calibration Procedures and the External Calibration Procedures sections, including step-by-step instructions on calling the appropriate calibration functions.

Contains VIs that correspond to the functions in the

niFgen_32.dll.

Contains the function panels for the function in the

niFgen32.dll.

Documentation

For information about NI-FGEN and the NI PXI-5422, you may find the following documents helpful:

• NI Signal Generators Getting Started Guide

• NI Signal Generators Help

• NI PXI-5422 Specifications

• NI-FGEN Instrument Driver Quick Reference Guide

The NI Signal Generators Getting Started Guide provides instructions for installing and configuring NI signal generators.

The NI Signal Generators Help includes detailed information about the NI PXI-5422 and the NI-FGEN functions. You can access this help file by selecting Start»Programs»National Instruments»NI-FGEN» Documentation»NI Signal Generators Help. For the latest versions of NI documentation, refer to

Self-Calibration Procedures

The NI PXI-5422 is capable of performing self-calibration, which adjusts the gain and offset of the main and direct analog paths. Self-calibration exclusively uses an onboard A/D converter (ADC) to measure the output voltage. You can implement self-calibration on the NI PXI-5422 by following procedures similar to the Verifying the DC Gain and Offset

Accuracy and the Adjusting the Analog Output procedures. However,

output impedance, oscillator frequency, and the calibration ADC cannot be adjusted during self-calibration.

ni.com/manuals.

You can initiate self-calibration interactively from Measurement & Automation Explorer (MAX) or from the FGEN Soft Front Panel (SFP). Alternately, you can initiate self-calibration programmatically using NI-FGEN.

MAX

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

1. Launch MAX.

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

NI PXI-5422 Calibration Procedure 6 ni.com

3. Select the device that you want to calibrate.

4. Initiate self-calibration in one of the following ways:

FGEN Soft Front Panel

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

1. Select the device that you want to calibrate using the Device

2. Open the Calibration dialog box (Utility»Calibration).

3. Click Perform self-calibration.

NI-FGEN

To self-calibrate the NI PXI-5422 programmatically using NI-FGEN, complete the following steps:

1. Call

2. Call

3. Call

•Click Self-Calibrate in the upper right corner.

• Right-click the device name under Devices and Interfaces,

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

Configuration dialog box (Edit»Device Configuration).

niFgen_init (niFgen Initialize VI) to open an NI-FGEN session

using the following parameters:

• resourceName: The name of the device that you want to calibrate.

You can find this name under Devices and Interfaces in MAX.

• IDQuery:

• resetDevice: VI_TRUE

• vi: A pointer to a ViSession. The variable passed by reference

through this parameter receives the value that identifies the session created by this function. This value acts as the session handle and is passed as the first parameter to all subsequent NI-FGEN functions.

niFgen_SelfCal (niFgen Self Cal VI) using the following

parameter:

• vi: The session handle returned from

niFgen_close (niFgen Close VI) to close the NI-FGEN session

using the following parameter:

• vi: The session handle returned from

VI_TRUE

niFgen_init

External Calibration Options

External calibration involves both verification and adjustment. Verification is the process of testing the device to ensure that the output accuracy is within certain specifications. You can use verification to ensure that the adjustment process was successful or to determine if the adjustment process needs to be performed.

Adjustment is the process of measuring and compensating for device performance to improve the output accuracy. Performing an adjustment updates the calibration date, resetting the calibration interval. The device is guaranteed to meet or exceed its published specifications for the duration of the calibration interval.

This document provides two sets of test limits for most verification stages, the calibration test limits and the published specifications. The calibration test limits are more restrictive than the published specifications. If all of the output errors determined during verification fall within the calibration test limits, the device is guaranteed to meet or exceed its published specifications for a full calibration interval (two years). For this reason, you must verify against the calibration test limits when performing verification after adjustment.

If all of the output errors determined during verification fall within the published specifications, but not within the calibration test limits, the device meets its published specifications. However, the device may not remain within these specifications for another two years. The device will meet published specifications for the rest of the current calibration interval.

In this case, you can perform an adjustment if you want to improve the output accuracy or reset the calibration interval. If some output errors determined during verification do not fall within the published specifications, you must perform an adjustment to restore the device operation to its published specifications.

The Complete Calibration section describes the recommended calibration procedure. The Optional Calibration section describes alternate procedures that allow you to skip adjustment if the device already meets its calibration test limits or published specifications.

Complete Calibration

Performing a complete calibration is the recommended way to guarantee that the NI PXI-5422 meets or exceeds its published specifications for a two-year calibration interval. At the end of the complete calibration procedure, you verify that the output error falls within the calibration test limits. Figure 1 shows the programming flow for complete calibration.

NI PXI-5422 Calibration Procedure 8 ni.com

Self-Calibrate

Verify

Adjust

(Cal Dates and

Temperatures

Updated)

Verify

Document

Pre-Adjustment

Results

Document

Post-Adjustment

Results

Calibration/ Verification

Complete

Ye s N o

Meets

Calibration

Test Limits?

Review Verification/ Adjustment

Procedure or

Return Device

Figure 1. Complete Calibration Programming Flow

Optional Calibration

Note Regardless of the results of the first verification, if you choose to perform an

adjustment you must verify that the output error falls within the calibration test limits at the end of the calibration procedure.

You can choose to skip the adjustment steps of the calibration procedure if the output error is within the calibration test limits or the published specifications during the first verification. If all of the output errors determined during the first verification fall within the calibration test limits, the device is guaranteed to meet or exceed its published specifications for a full calibration interval. In this case, you can update the calibration date, effectively resetting the calibration interval, without actually performing an adjustment. Refer to the Adjusting the NI PXI-5422 section for more information.

If all of the output errors determined during the first verification fall within the published specifications, but not within the calibration test limits, adjustment is also optional. However, you cannot update the calibration date because the device will not necessarily operate within the published specifications for an additional two years.

Figure 2 shows the programming flow for the optional calibration.

NI PXI-5422 Calibration Procedure 10 ni.com

Self-Calibrate

Verify

Document

Pre-Adjustment

Results

Update Calibration

Dates and

Temperatures

Without Adjusting

Calibration/ Verification

Ye s N o

Complete

Meets

Calibration

Test Limits?

Ye s No

Results

Within

Published Specs

(Adjustment

Optional)

Adjust

Anyway?

Specifications?

Ye sNo

Meets

Published

Ye s

Adjust

(Cal Dates and

Temperatures

Updated)

Verify

Meets

Calibration

Test Limits?

Document

Post-Adjustment

Results

Review Verification/ Adjustment

Procedure or

Return Device

Figure 2. Optional Calibration Programming Flow

External Calibration Requirements

This section describes the test equipment and test conditions required for calibration.

Test Equipment

External calibration requires different equipment for each applicable specification. Refer to Table 2 for a list of equipment.

Table 2. Equipment Required for Calibrating the NI PXI-5422

Instrument

Digital multimeter (DMM)

Male banana to female BNC adapter

Male BNC to female SMB cable

Spectrum analyzer or frequency meter

Male BNC to female SMB cable

Test Conditions

Applicable

Specification

DC gain and offset DC accuracy ≤ ±50 ppm

Frequency accuracy Ability to measure

Follow these guidelines to optimize the connections and the environment during calibration:

• Keep connections to the NI PXI-5422 short.

• Keep relative humidity below 80%.

• Maintain a temperature between 18 °C and 28 °C.

• Observe the 15-minute warm-up time.

Minimum

Specifications

Resolution ≤1 µV

— —

50 Ω, RG-223 —

10 MHz or higher sine waves

Frequency accuracy to ±500 ppb

50 Ω, RG-223 —

Recommended

Instrument

NI PXI-4070

Agilent HP 34401A

Keithley 2000

NI PXI-5660

Agilent HP 8560E

Agilent HP 53131A or HP 53132A with timebase option 001, 010, or 012

NI PXI-5422 Calibration Procedure 12 ni.com

External Calibration Procedures

The complete external calibration procedure consists of self-calibrating, verifying the performance of the NI PXI-5422, adjusting the calibration constants, and verifying again after the adjustments. In some cases, the complete calibration procedure may not be required. Refer to the External

Calibration Options section for more information.

The external calibration procedure automatically stores the calibration date to allow traceability.

Writing Your Calibration Procedure

Before you begin to write your calibration program, review the programming flows in Figures 1 and 2.

Calibration Procedures in LabVIEW

To write calibration procedures in LabVIEW, you must use the VIs included in the appear within the NI-FGEN Calibration palette under Functions» Instrument I/O»Instruments Drivers»NI-FGEN»Calibration.

Calibration Procedures in LabWindows/CVI

To write calibration procedures in LabWindows/CVI, you must use the functions included in the the calibration functions under the Calibration class node.

niFgen.llb file. After installation, these VIs

niFgen.fp file. After installation, you can locate

Calibration Procedures in C

To write calibration procedures in C, you must include the niFgen.h file in the code that calls the calibration functions, and you must link the

niFgen.lib file into the build of your executable.

Verifying NI PXI-5422 Specifications

Note Always self-calibrate the NI PXI-5422 before beginning a verification procedure.

This section provides instructions for verifying the NI PXI-5422 specifications. This section also includes instructions for updating the calibration cycle.

Verification determines whether the device is performing within its specifications prior to external adjustment. Verification and external adjustment together comprise a complete calibration. To verify that the NI PXI-5422 still meets its specifications, you must use NI-FGEN to control the NI PXI-5422.

The steps in the verification procedures describe the code that you use to generate the appropriate signals, as well as the NI-FGEN function calls that you make to verify specifications.

You can verify the following specifications for the NI PXI-5422:

• Oscillator frequency accuracy

• DC gain and offset accuracy

The verification procedure for each of these specifications includes setting up, programming, and cleaning up.

Note If any of these tests fail immediately after you perform an external adjustment, verify

that you have met the required test conditions before you return the NI PXI-5422 to NI for repair.

Refer to Table 2 for information about which instrument to use for verifying each specification. Refer to Figure 3 for the names and locations of the NI PXI-5422 front panel connectors.

NI PXI-5422 Calibration Procedure 14 ni.com

NI PXI-5422

16-Bit 200 MS/s AWG

ACCESS ACTIVE

CH 0

CLK

PFI 0

PFI 1

DIGITAL DATA & CONTROL

Figure 3. NI PXI-5422 Front Panel Connectors

Verifying the Oscillator Frequency Accuracy

This test verifies the frequency accuracy of the oscillator on the NI PXI-5422. The verification involves generating a 10 MHz sine wave with the NI PXI-5422 and measuring the sine wave frequency with one of the instruments from Table 2.

To verify the frequency accuracy of the oscillator on the NI PXI-5422, complete the following steps:

1. Connect the NI PXI-5422 CH 0 front panel connector to the instrument measuring the frequency accuracy with a male BNC to female SMB cable.

2. Call

3. Call

4. Call niFgen_SetAttributeViReal64 to set the gain (niFgen

niFgen_init (niFgen Initialize VI) using the following

parameters:

• resourceName: The name of the device that you want to verify.

You can find this name under Devices and Interfaces in MAX.

• IDQuery:

VI_TRUE

• resetDevice: VI_TRUE

• vi: A pointer to a ViSession. The variable passed by reference

niFgen_SetAttributeViReal64 to set the sample rate

(niFgen property node: Arbitrary Waveform Output»Sample Rate) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_SAMPLE_RATE

• value: 200000000

property node: Arbitrary Waveform Output»Arbitrary Waveform Gain) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_GAIN

• value: 1

Note You can adjust this value based on which measuring device you use.

NI PXI-5422 Calibration Procedure 16 ni.com

5. Call niFgen_SetAttributeViReal64 to set the offset (niFgen

property node: Arbitrary Waveform Output»Arbitrary Waveform Offset) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_OFFSET

• value: 0

Note You can adjust this value based on which measuring device you use.

6. Call

niFgen_SetAttributeViBoolean to set the analog filter state

(niFgen property node: Output Attributes»Analog Filter Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_FILTER_ENABLED

• value: VI_TRUE

7. Generate an array of waveform samples. The waveform should have 20 samples per cycle with a total of 500 samples. This configuration results in 25 sine wave cycles. Because you set the sample rate to 200 MS/s and because you are using 20 samples per cycle, the resulting waveform is a 10 MHz sine wave.

Note The sample values of this waveform must fall between –1.0 and 1.0.

8. Call

niFgen_CreateArbWaveform (niFgen Create Arbitrary

Waveform VI) using the following parameters:

• vi: The session handle returned from

• wfmSize: The size in samples (

niFgen_init

500) of the waveform you created

in step 7

• wfmData: The array of waveform samples that you created in

step 7

• wfmHandle: The variable passed by reference through this

parameter receives the value (waveform handle) that identifies the waveform created by this function.

9. Call

niFgen_InitiateGeneration (niFgen Initiate Generation VI)

to initiate the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_init

10. Measure the frequency out of the NI PXI-5422.

A frequency error of 45 Hz for a 10 MHz signal corresponds to an error of 4.5 ppm. This limit accounts for the initial accuracy and the frequency deviation caused by temperature and aging. Refer to Table 3 for frequency ranges.

Table 3. Frequency Ranges

Calibration Test Limit Published Specifications ±25 ppm

Low High Low High

9,999,955 Hz 10,000,045 Hz 9,999,750 Hz 10,000,250 Hz

11. Call

niFgen_AbortGeneration (niFgen Abort Generation VI) to

abort the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_init

12. Call niFgen_close (niFgen Close VI) to close the instrument driver session, to destroy the instrument driver session and all of its properties, and to release any memory resources NI-FGEN uses. Use the following parameter:

• vi: The session handle returned from

niFgen_init

Verifying the DC Gain and Offset Accuracy

This test verifies the DC gain and offset accuracy of the NI PXI-5422 into a high-impedance load by generating a number of DC voltages and offsets, measuring the voltage with a DMM, and comparing the NI PXI-5422 to the error limits.

The DC gain and offset accuracy verification procedure has three sub-procedures that verify the following:

• Main analog path gain

• Main analog path offset

• Direct path gain

Verifying the Main Analog Path Gain

To verify the gain of the NI PXI-5422 main analog path, complete the following steps:

1. Connect the NI PXI-5422 CH 0 front panel connector to the DMM for measuring DC gain and offset accuracy.

2. Call

niFgen_init (niFgen Initialize VI) using the following

parameters:

• resourceName: The name of the device that you want to verify.

You can find this name under Devices and Interfaces in MAX.

NI PXI-5422 Calibration Procedure 18 ni.com

• IDQuery: VI_TRUE

• resetDevice: VI_TRUE

• vi: A pointer to a ViSession. The variable passed by reference

3. Call

niFgen_SetAttributeViBoolean to set the analog filter state

(niFgen property node: Output Attributes»Analog Filter Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_FILTER_ENABLED

• value: VI_FALSE

4. Call niFgen_SetAttributeViReal64 to set the load impedance

(niFgen property node: Output Attributes»Load Impedance) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID:

NIFGEN_ATTR_LOAD_IMPEDANCE

• value: 10000000000

5. Call niFgen_SetAttributeViInt32 to set the analog path (niFgen

property node: Output Attributes»Analog Path) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_PATH

• value: NIFGEN_VAL_MAIN_ANALOG_PATH

6. Call niFgen_SetAttributeViReal64 to set the output impedance

(niFgen property node: Basic Operation»Output Impedance) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_IMPEDANCE

• value: 50

7. Call niFgen_SetAttributeViBoolean to enable the analog output (niFgen property node: Basic Operation»Output Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_ENABLED

• value: VI_TRUE

8. Create an array of waveform samples for the positive full-scale DC waveform. This array should contain 500 samples with each sample having the value

9. Call

niFgen_CreateArbWaveform (niFgen Create Arbitrary

1.0 (representation: double).

Waveform VI) using the following parameters:

• vi: The session handle returned from

• wfmSize: The size in samples (

niFgen_init

500) of the waveform you created

in step 8

• wfmData: The array of waveform samples that you created in

step 8

• wfmHandle: The variable passed by reference through this

parameter receives the value (waveform handle) that identifies the waveform created by this function (positive full-scale handle).

10. Create an array of waveform samples for the negative full-scale DC waveform. This array should contain 500 samples with each sample having the value

11. Call

niFgen_CreateArbWaveform (niFgen Create Arbitrary

–1.0 (representation: double).

Waveform VI) using the following parameters:

• vi: The session handle returned from

• wfmSize: The size in samples (

niFgen_init

500) of the waveform that you

created in step 10

• wfmData: The array of waveform samples that you created in

step 10

• wfmHandle: The variable passed by reference through this

parameter receives the value (waveform handle) that identifies the waveform created by this function (negative full-scale handle).

NI PXI-5422 Calibration Procedure 20 ni.com

12. Call niFgen_SetAttributeViReal64 to set the offset (niFgen

property node: Arbitrary Waveform Output»Arbitrary Waveform Offset) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_OFFSET

• value: 0

13. Repeat steps 14 through 24 for each of the 24 iterations listed in Table 4, changing the Gain value for each iteration. You can use Table 4 to record the results of these steps.

Spec

Published

Test Li mi t

Calibration

Error

Negative

Full-Scale

Error

Positive

Full-Scale

Negative

Measured

Full-Scale

Positive

Measured

Full-Scale

(Volts)

Ideal Negative

Ideal

Positive

Full-Scale

(Volts)

1 12.000000 12.000000 –12.000000 ±0.019700 ±0.048500

2 10.000000 10.000000 –10.000000 ±0.016500 ±0.040500

3 7.000000 7.000000 –7.000000 ±0.011700 ±0.028500

4 5.000000 5.000000 –5.000000 ±0.008500 ±0.020500

5 3.500000 3.500000 –3.500000 ±0.006100 ±0.014500

6 2.500000 2.500000 –2.500000 ±0.004500 ±0.010500

7 2.000000 2.000000 –2.000000 ±0.003700 ±0.008500

8 1.650000 1.650000 –1.650000 ±0.003140 ±0.007100

9 1.250000 1.250000 –1.250000 ±0.002500 ±0.005500

10 0.850000 0.850000 – 0.850000 ±0.001860 ±0.003900

11 0.600000 0.600000 – 0.600000 ±0.001460 ±0.002900

12 0.415000 0.415000 – 0.415000 ±0.001164 ±0.002160

13 0.300000 0.300000 – 0.300000 ±0.000980 ±0.001700

14 0.205000 0.205000 – 0.205000 ±0.000828 ±0.001320

15 0.150000 0.150000 – 0.150000 ±0.000740 ±0.001100

16 0.105000 0.105000 – 0.105000 ±0.000668 ±0.000920

17 0.075000 0.075000 – 0.075000 ±0.000620 ±0.000800

18 0.055000 0.055000 – 0.055000 ±0.000588 ±0.000720

19 0.037500 0.037500 – 0.037500 ±0.000560 ±0.000650

Table 4. Values for Verifying the Gain of the Main Analog Path

Iteration Gain

NI PXI-5422 Calibration Procedure 22 ni.com

20 0.026000 0.026000 – 0.026000 ±0.000542 ±0.000604

Spec

Published

Test Li mi t

Calibration

Error

Negative

Full-Scale

Error

Positive

Full-Scale

Negative

Measured

Full-Scale

Positive

Measured

Full-Scale

(Volts)

Full-Scale

Ideal Negative

Table 4. Values for Verifying the Gain of the Main Analog Path (Continued)

Ideal

(Volts)

Positive

Full-Scale

21 0.018500 0.018500 – 0.018500 ±0.000530 ±0.000574

22 0.013000 0.013000 – 0.013000 ±0.000521 ±0.000552

23 0.009000 0.009000 – 0.009000 ±0.000514 ±0.000536

24 0.006500 0.006500 – 0.006500 ±0.000510 ±0.000526

Iteration Gain

Error Positive Full-Scale Value = (Measured Positive Full-Scale Value) – (Ideal Positive Full-Scale Value) 2 Error Negative Full-Scale Value = (Measured Negative Full-Scale Value) – (Ideal Negative Full-Scale Value)

14. Call niFgen_SetAttributeViReal64 to set the gain (niFgen

property node: Arbitrary Waveform Output»Arbitrary Waveform Gain) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_GAIN

• value: The Gain value listed in Table 4 for the current iteration

15. Call

niFgen_SetAttributeViInt32 to choose the positive

full-scale DC waveform (niFgen property node: Arbitrary Waveform Output»Arbitrary Waveform Handle) using

the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_WAVEFORM_HANDLE

• value: The wfmHandle from step 9 (positive full-scale handle)

16. Call

niFgen_InitiateGeneration (niFgen Initiate Generation VI)

to initiate the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_init

17. Measure the DC voltage out of the NI PXI-5422. Record this value in the Measured Positive Full-Scale value column of Table 4.

18. Subtract the Ideal Positive Full-Scale value from the Measured

Positive Full-Scale value and record the result under Error Positive Full-Scale. The Error Positive Full-Scale value should be less than

or equal to the limit you are using.

19. Call

niFgen_AbortGeneration (niFgen Abort Generation VI) to

abort the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_init

20. Call niFgen_SetAttributeViInt32 to choose the negative full-scale DC waveform (niFgen property node: Arbitrary Waveform Output»Arbitrary Waveform Handle) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_WAVEFORM_HANDLE

• value: The wfmHandle from step 11 (negative full-scale handle)

21. Call

niFgen_InitiateGeneration (niFgen Initiate Generation VI)

to initiate the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_init

22. Measure the DC voltage out of the NI PXI-5422. Record this value in the Measured Negative Full-Scale column of Table 4.

NI PXI-5422 Calibration Procedure 24 ni.com

23. Subtract the Ideal Negative Full-Scale value from the Measured Negative Full-Scale value and record the result under Error Negative Full-Scale. The Error Negative Full-Scale value should be less than

or equal to the limit you are using.

24. Call

niFgen_AbortGeneration (niFgen Abort Generation VI) to

abort the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_init

25. Return to step 14 until iterations are completed.

26. Verify that both the Error Positive Full-Scale value and the Error Negative Full-Scale value are less than or equal to the limit you are using. If either of the errors is greater than the Calibration Test Limit or the Published Specification, perform an external adjustment.

Verifying the Main Analog Path Offset

To verify the offset of the NI PXI-5422 main analog path, complete the following steps:

1. Create an array of waveform samples for the mid-scale DC waveform (0 VDC). This array should contain 500 samples with each sample having the value

2. Call

niFgen_CreateArbWaveform (niFgen Create Arbitrary

Waveform VI) using the following parameters:

• vi: The session handle returned from

• wfmSize: The size in samples (

created in step 1.

• wfmData: The array of waveform samples that you created in

step 1.

• wfmHandle: The variable passed by reference through this

parameter receives the value (waveform handle) that identifies the waveform created by this function (mid-scale handle).

3. Call

niFgen_SetAttributeViInt32 to choose the mid-scale

handle DC waveform (niFgen property node: Arbitrary Waveform Output»Arbitrary Waveform Handle) using the following

parameters:

• vi: The session handle returned from

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_WAVEFORM_HANDLE

• value: The wfmHandle from step 2 (mid-scale handle)

4. Repeat steps 5 through 15 for each of the 24 iterations listed in Table 5, changing the Ideal Positive Offset, Ideal Negative Offset, and Gain values for each iteration. You can use Table 5 to record the results of these steps.

0.0 (representation: double).

niFgen_init

500) of the waveform that you

niFgen_init

Spec

Published

Test Li mi t

Calibration

Error

Offset

Negative

Error

Offset

Positive

Offset

Negative

Measured

Offset

Positive

Measured

(Volts)

Ideal

Offset

(Volts)

Negative

Table 5. Values for Verifying the Offset of the Main Analog Path

Ideal

Offset

(Volts)

Positive

1 12.000000 6.000000 – 6.000000 ±0.021500 ±0.051500

2 10.000000 5.000000 –5.000000 ±0.018000 ±0.043000

3 7.000000 3.500000 –3.500000 ±0.012750 ±0.030250

4 5.000000 2.500000 –2.500000 ±0.009250 ±0.021750

5 3.500000 1.750000 –1.750000 ±0.006625 ±0.015375

6 2.500000 1.250000 –1.250000 ±0.004875 ±0.011125

7 2.000000 1.000000 –1.000000 ±0.004000 ±0.009000

8 1.650000 0.825000 – 0.825000 ±0.003388 ±0.007513

9 1.250000 0.625000 – 0.625000 ±0.002688 ±0.005813

10 0.850000 0.425000 – 0.425000 ±0.001988 ±0.004113

11 0.600000 0.300000 – 0.300000 ±0.001550 ±0.003050

12 0.415000 0.207500 – 0.207500 ±0.001226 ±0.002264

13 0.300000 0.150000 – 0.150000 ±0.001025 ±0.001775

14 0.205000 0.102500 – 0.102500 ±0.000859 ±0.001371

15 0.150000 0.075000 – 0.075000 ±0.000763 ±0.001138

16 0.105000 0.052500 – 0.052500 ±0.000684 ±0.000946

17 0.075000 0.037500 – 0.037500 ±0.000631 ±0.000819

18 0.055000 0.027500 – 0.027500 ±0.000596 ±0.000734

19 0.037500 0.018750 – 0.018750 ±0.000566 ±0.000659

Iteration Gain

NI PXI-5422 Calibration Procedure 26 ni.com

20 0.026000 0.013000 – 0.013000 ±0.000546 ±0.000611

Spec

Published

Test Li mi t

Calibration

Error

Offset

Negative

Error

Offset

Positive

Offset

Negative

Measured

Offset

Positive

Measured

(Volts)

Ideal

Offset

(Volts)

Negative

Table 5. Values for Verifying the Offset of the Main Analog Path (Continued)

Ideal

Offset

(Volts)

Positive

21 0.018500 0.009250 – 0.009250 ±0.000532 ±0.000579

22 0.013000 0.006500 – 0.006500 ±0.000523 ±0.000555

23 0.009000 0.004500 – 0.004500 ±0.000516 ±0.000538

24 0.006500 0.003250 – 0.003250 ±0.000511 ±0.000528

Iteration Gain

Error Positive Offset Value = (Measured Positive Offset Value) – (Ideal Positive Offset Value) 2 Error Negative Offset Value = (Measured Negative Offset Value) – (Ideal Negative Offset Value)

5. Call niFgen_SetAttributeViReal64 to set the offset (niFgen

property node: Arbitrary Waveform Output»Arbitrary Waveform Offset) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_OFFSET

• value: The Ideal Positive Offset value listed in Table 5 for the

current iteration

6. Call

niFgen_SetAttributeViReal64 to set the gain (niFgen

property node: Arbitrary Waveform Output»Arbitrary Waveform Gain) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_GAIN

• value: The Gain value listed in Table 5 for the current iteration

7. Call

niFgen_InitiateGeneration (niFgen Initiate Generation VI)

to initiate the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_init

8. Measure the positive DC voltage out of the NI PXI-5422. Record the positive DC voltage out measurement in the Measured Positive Offset column of Table 5.

9. Subtract the Ideal Positive Offset from the Measured Positive Offset and record the result under Error Positive Offset. The Error Positive Offset should be less than or equal to the limit you are using.

10. Call

niFgen_AbortGeneration (niFgen Abort Generation VI) to

abort the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_init

11. Call niFgen_SetAttributeViReal64 to set the offset (niFgen property node: Arbitrary Waveform Output»Arbitrary Waveform Offset) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_OFFSET

• value: The Ideal Negative Offset value listed in Table 5 for the

current iteration

12. Call

niFgen_InitiateGeneration (niFgen Initiate Generation VI)

to initiate the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_init

NI PXI-5422 Calibration Procedure 28 ni.com

13. Measure the negative DC voltage out of the NI PXI-5422. Record negative DC voltage out measurement in the Measured Negative Offset column of Table 5.

14. Subtract the Ideal Negative Offset from the Measured Negative Offset and record the result under Error Negative Offset. The Error Negative Offset should be less than or equal to the limit you are using.

15. Call

niFgen_AbortGeneration (niFgen Abort Generation VI) to

abort the waveform generation using the following parameter:

• vi: The session handle returned from

16. Return to step 5 until all iterations are completed.

17. Verify that all errors are less than or equal to the limit you are using. If any of the errors are greater than the Calibration Test Limit or the Published Specification, perform an external adjustment.

Verifying the Gain of the Direct Path

To verify the gain of the NI PXI-5422 Direct path, complete the following steps:

Note The offset is not adjustable for the Direct path.

niFgen_init

1. Call

niFgen_SetAttributeViReal64 to set the offset (niFgen

property node: Arbitrary Waveform Output»Arbitrary Waveform Offset) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_OFFSET

• value: 0

2. Call niFgen_SetAttributeViInt32 to set the analog path (niFgen property node: Output Attributes»Analog Path) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_PATH

• value: NIFGEN_VAL_DIRECT_ANALOG_PATH

3. Repeat steps 4 through 15 for each of the seven iterations listed in Table 6, changing the Gain value for each iteration. You can use Table 6 to record the results of these steps.

Error

Measured

Spec

Published

Test Li mi t

Calibration

Negative

Full-Scale

Positive

Full-Scale

Limit

Offset

Negative

Full-Scale

(Volts)

Positive

Measured

Full-Scale

Table 6. Values for Verifying the Gain of the Direct Analog Path

Ideal

(Volts)

Negative

Full-Scale

Ideal

(Volts)

Positive

Full-Scale

1 1.000000 1.000000 –1.000000 ±0.025000 ±0.001600 ±0.004000

2 0.950000 0.950000 – 0.950000 ±0.025000 ±0.001520 ±0.003800

3 0.900000 0.900000 – 0.900000 ±0.025000 ±0.001440 ±0.003600

4 0.850000 0.850000 – 0.850000 ±0.025000 ±0.001360 ±0.003400

5 0.800000 0.800000 – 0.800000 ±0.025000 ±0.001280 ±0.003200

6 0.750000 0.750000 – 0.750000 ±0.025000 ±0.001200 ±0.003000

7 0.710000 0.710000 – 0.710000 ±0.025000 ±0.001136 ±0.002840

Iteration Gain

NI PXI-5422 Calibration Procedure 30 ni.com

Offset = ((Measured Positive Full-Scale Value) + (Measured Negative Full-Scale Value))/2 2 Error Positive Full-Scale Value = (Measured Positive Full-Scale Value) – Offset – (Ideal Positive Full-Scale Value) 3 Error Negative Full-Scale Value = (Measured Negative Full-Scale Value) – Offset – (Ideal Negative Full-Scale Value)

4. Call niFgen_SetAttributeViReal64 to set the gain (niFgen property node: Arbitrary Waveform Output»Arbitrary Waveform Gain) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_GAIN

• value: The Gain value listed in Table 6 for the current iteration

5. Call

niFgen_SetAttributeViInt32 to choose the positive

full-scale DC waveform (niFgen property node: Arbitrary Waveform Output»Arbitrary Waveform Handle) using

the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_WAVEFORM_HANDLE

• value: The wfmHandle from step 9 of the Verifying the Main

Analog Path Gain section (positive full-scale handle)

6. Call

niFgen_InitiateGeneration (niFgen Initiate Generation VI)

to initiate the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_init

7. Measure the positive DC voltage out of the NI PXI-5422. Record the positive DC voltage out measurement in the Measured Positive Full-Scale Value column of Table 6.

8. Call

niFgen_AbortGeneration (niFgen Abort Generation VI)

to abort the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_init

9. Call niFgen_SetAttributeViInt32 to choose the negative full-scale DC waveform (niFgen property node: Arbitrary Waveform Output»Arbitrary Waveform Handle) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_WAVEFORM_HANDLE

• value: The wfmHandle from step 11 of the Verifying the Main

Analog Path Gain section (negative full-scale handle)

10. Call

niFgen_InitiateGeneration (niFgen Initiate Generation VI)

to initiate the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_init

11. Measure the negative DC voltage out of the NI PXI-5422. Record the negative DC voltage out measurement in the Measured Negative Full-Scale Value column of Table 6.

12. Call

niFgen_AbortGeneration (niFgen Abort Generation VI) to

abort the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_init

13. Average the Measured Positive Full-Scale Value and Measured Negative Full-Scale Value to calculate the Offset.

14. Verify that the Offset is less than or equal to the Offset Limit listed in Table 6 for the current iteration.

15. Subtract the Offset and the Ideal Full-Scale Value from the Measured Full-Scale Value to get the Error Full-Scale Value for both the positive and negative settings, respectively.

16. Return to step 4 until all iterations are completed.

17. Verify that these errors are less than or equal to the limits you are using. If any of the errors are greater than the Calibration Test Limit or the Published Specification, perform an external adjustment.

18. Call

niFgen_close (niFgen Close VI) to close the instrument driver

session, to destroy the instrument driver session and all of its properties, and to release any memory resources that NI-FGEN uses. Use the following parameter:

• vi: The session handle returned from

niFgen_init

Adjusting the NI PXI-5422

If the NI PXI-5422 successfully passes all verification within the calibration test limits, adjustment is recommended, but not required, to guarantee its published specifications for the next two years. If the NI PXI-5422 was not within the calibration test limits for each verification procedure, perform the adjustment procedure to improve the accuracy of the NI PXI-5422. Refer to the External Calibration Options section to determine which procedures to perform.

An adjustment is required only once every two years. The adjustment procedure automatically updates the calibration date and temperature in the EEPROM of the NI PXI-5422.

If the NI PXI-5422 passed verification within the calibration test limits and you do not want to do an adjustment, you can update the calibration date and onboard calibration temperature without making any adjustments by completing the following steps:

NI PXI-5422 Calibration Procedure 32 ni.com

1. Call niFgen_InitExtCal (niFgen Init Ext Cal VI) to open an NI-FGEN external calibration session using the following parameters:

• resourceName: The name of the device you want to calibrate.

This name can be found under Devices and Interfaces in MAX.

• password: The password required to open an external

calibration session. If this password has not been changed since manufacturing, the password is

NI.

• vi: A pointer to a ViSession. The variable passed by reference

through this parameter receives the value that identifies the external calibration session created by this function. This value acts as the session handle and is passed as the first parameter to all subsequent NI-FGEN functions.

2. Call

niFgen_CloseExtCal (niFgen Close Ext Cal VI) using the

following parameters:

• vi: The session handle returned from

• action:

NIFGEN_VAL_EXT_CAL_COMMIT

niFgen_InitExtCal

The external calibration procedure adjusts the analog output, the oscillator frequency, and the calibration ADC. Analog output adjustment characterizes the DC gains and the offsets of the analog path to ensure the analog output voltage accuracy. Adjusting the oscillator frequency adjusts the onboard oscillator to ensure frequency accuracy. Calibration ADC adjustment characterizes the onboard ADC gain and offset so that self-calibration results in an accurately calibrated device.

You cannot perform an external calibration using a standard NI-FGEN session. You must create an external calibration session using

niFgen_InitExtCal (niFgen Init Ext Cal VI). An external calibration

session allows you to use NI-FGEN functions and attributes that are specifically for external calibration, while still allowing you to use all the standard NI-FGEN functions and attributes with the external calibration session.

Along with the standard NI-FGEN attributes, the external calibration session uses a set of calibration constants that are determined during the calibration procedure and stored in the device onboard memory when the session is closed. NI-FGEN uses these calibration constants during a standard NI-FGEN session to ensure that the device operates within its specifications.

You must close an external calibration session by using

niFgen_CloseExtCal (niFgen Close Ext Cal VI), as shown in Figure 4.

Initialize Ext Cal Session

Initialize Analog Output Calibration

Adjust Main Path Pre-Amp Offset

Adjust Main Path Pre-Amp Gain

Adjust Main Path Post-Amp

Gain and Offset

Adjust Direct Path Gain

Initialize Oscillator

Frequency Calibration

Adjust Oscillator Frequency

Initialize Calibration

ADC Calibration

Adjust Calibration ADC

Close Ext Cal Session

Figure 4. NI PXI-5422 External Calibration Procedure

NI PXI-5422 Calibration Procedure 34 ni.com

Initializing the External Calibration Session

Call niFgen_InitExtCal (niFgen Init Ext Cal VI) to open an NI-FGEN external calibration session using the following parameters:

• resourceName: The name of the device you want to calibrate. This name can be found under Devices and Interfaces in MAX.

• password: The password required to open an external calibration session. If this password has not been changed since manufacturing, the password is

• vi: A pointer to a ViSession. The variable passed by reference through this parameter receives the value that identifies the external calibration session created by this function. This value acts as the session handle and is passed as the first parameter to all subsequent NI-FGEN functions.

NI.

Adjusting the Analog Output

The analog output adjustment procedure has several sub-procedures that adjust the following:

• Main path pre-amplifier offset

• Main path pre-amplifier gain

• Main path post-amplifier gain and offset

• Direct path gain

In each of these sub-procedures, you put the device in several configurations and take several output measurements. You then pass these measurements to NI-FGEN, which determines the calibration constants for the device.

Initializing Analog Output Calibration

1. Call niFgen_InitializeAnalogOutputCalibration (niFgen Initialize Analog Output Calibration VI) using the following parameter:

• vi: The session handle returned from

2. Call

niFgen_WriteBinary16AnalogStaticValue (niFgen Write

Binary 16 Analog Static Value VI) to set the main DAC value using the following parameters:

• vi: The session handle returned from

• channelName: "0"

• value: 0

niFgen_InitExtCal

3. Call niFgen_SetAttributeViInt32 to set the analog path value

(niFgen property node: Output Attributes»Analog Path) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_PATH

• value: NIFGEN_VAL_FIXED_LOW_GAIN_ANALOG_PATH

4. Call niFgen_SetAttributeViInt32 to set the gain DAC value

(niFgen property node: Calibration»Gain DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_GAIN_DAC_VALUE

• value: 2000

5. Call niFgen_SetAttributeViInt32 to set the offset DAC value

(niFgen property node: Calibration»Offset DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OFFSET_DAC_VALUE

• value: 32767

6. Call niFgen_SetAttributeViBoolean to set the analog filter state

(niFgen property node: Output Attributes»Analog Filter Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_FILTER_ENABLED

• value: VI_FALSE

7. Call niFgen_SetAttributeViReal64 to set the pre-amplifier

attenuation (niFgen property node: Calibration»Pre-Amplifier Attenuation) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_PRE_AMPLIFIER_ATTENUATION

• value: 0

NI PXI-5422 Calibration Procedure 36 ni.com

8. Call niFgen_SetAttributeViReal64 to set the post-amplifier attenuation (niFgen property node: Calibration»Post-Amplifier Attenuation) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_POST_AMPLIFIER_ATTENUATION

• value: 0

9. Call niFgen_SetAttributeViReal64 to set the output impedance (niFgen property node: Basic Operation»Output Impedance) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_IMPEDANCE

• value: 50

10. Call niFgen_SetAttributeViBoolean to enable the analog output (niFgen property node: Basic Operation»Output Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_ENABLED

• value: VI_TRUE

11. Call niFgen_Commit (niFgen Commit VI) to commit the attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

Adjusting the Main Path Pre-Amplifier Offset

1. Call niFgen_SetAttributeViInt32 to set the analog path value (niFgen property node: Output Attributes»Analog Path) using the following parameters:

• vi: The session handle returned from

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_PATH

• value: NIFGEN_VAL_FIXED_LOW_GAIN_ANALOG_PATH

niFgen_InitExtCal

2. Call niFgen_SetAttributeViReal64 to set the post-amplifier

attenuation (niFgen property node: Calibration»Post-Amplifier Attenuation) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_POST_AMPLIFIER_ATTENUATION

• value: 0

3. Call niFgen_WriteBinary16AnalogStaticValue (niFgen Write Binary 16 Analog Static Value VI) to set the main DAC value using the following parameters:

• vi: The session handle returned from

• channelName:

"0"

niFgen_InitExtCal

• value: 0

4. Repeat steps 5 through 8 for each of the 10 iterations listed in Table 7, changing the Analog Filter Enable, Pre-Amplifier Attenuation, and Current Configuration values for each iteration.

Table 7. Attributes and Values for Main Path Pre-Amplifier Offset

Analog Filter

Iteration

1 VI_FALSE 0 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_0DB

2 VI_FALSE 3 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_3DB

3 VI_FALSE 6 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_6DB

4 VI_FALSE 9 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_9DB

5 VI_FALSE 12 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_12DB

6 VI_TRUE 0 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_0DB

7 VI_TRUE 3 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_3DB

8 VI_TRUE 6 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_6DB

9 VI_TRUE 9 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_9DB

10 VI_TRUE 12 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_12DB

Enable

Pre-Amplifier

Attenuation

Current Configuration

NI PXI-5422 Calibration Procedure 38 ni.com

5. Call niFgen_SetAttributeViBoolean to set the analog filter state

(niFgen property node: Output Attributes»Analog Filter Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_FILTER_ENABLED

• value: The Analog Filter Enable value for the current iteration

from Table 7.

6. Call

niFgen_SetAttributeViReal64 to set the pre-amplifier

attenuation (niFgen property node: Calibration»Pre-Amplifier Attenuation) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_PRE_AMPLIFIER_ATTENUATION

• value: The Pre-Amplifier Attenuation value for the current

iteration from Table 7.

7. Take the following voltage measurements at the NI PXI-5422 CH 0 front panel connector into a high-impedance load:

a. Call

niFgen_SetAttributeViInt32 to set the gain DAC value

(niFgen property node: Calibration»Gain DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_GAIN_DAC_VALUE

• value: 2000

b. Call niFgen_SetAttributeViInt32 to set the offset DAC

value (niFgen property node: Calibration»Offset DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OFFSET_DAC_VALUE

• value: 50000

c. Call niFgen_Commit (niFgen Commit VI) to commit the

attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

d. Wait 500 ms for the output to settle.

e. Use the DMM to measure the voltage output by the device. This

measurement is

measurement 0, which is used in step 8.

f. Call niFgen_SetAttributeViInt32 to set the gain DAC value

(niFgen property node: Calibration»Gain DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_GAIN_DAC_VALUE

• value: 1000

g. Call niFgen_Commit (niFgen Commit VI) to commit the

attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

h. Wait 500 ms for the output to settle.

i. Use the DMM to measure the voltage output by the device. This

measurement is

j. Call

niFgen_SetAttributeViInt32 to set the offset DAC

measurement 1, which is used in step 8.

value (niFgen property node: Calibration»Offset DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OFFSET_DAC_VALUE

• value: 15000

k. Call niFgen_Commit (niFgen Commit VI) to commit the

attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

l. Wait 500 ms for the output to settle.

m. Use the DMM to measure the voltage output of the device. This

measurement is

measurement 2, which is used in step 8.

NI PXI-5422 Calibration Procedure 40 ni.com

8. Call niFgen_CalAdjustMainPathPreAmpOffset (niFgen Cal Adjust Main Path Pre Amp Offset VI) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• configuration: The Current Configuration value for the current

iteration from Table 7.

• gainDACValues: An array containing two elements—the two

values (

2000, 1000) that you set as the gain DAC in the order that

you measured them.

• offsetDACValues: An array containing two elements—the two

values (

50000, 15000) that you set as the offset DAC in the order

that you measured them.

• measuredOutputs: An array containing three elements—the

three output voltages (

measurement 2) that you measured in the order that you

measurement 0, measurement 1,

measured them.

Adjusting the Main Path Pre-Amplifier Gain

1. Call niFgen_SetAttributeViInt32 to set the analog path value (niFgen property node: Output Attributes»Analog Path) using the following parameters:

• vi: The session handle returned from

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_PATH

• value: NIFGEN_VAL_FIXED_LOW_GAIN_ANALOG_PATH

2. Call niFgen_SetAttributeViReal64 to set the post-amplifier attenuation (niFgen property node: Calibration»Post-Amplifier Attenuation) using the following parameters:

• vi: The session handle returned from

• channelName: "0"

• attributeID: NIFGEN_ATTR_POST_AMPLIFIER_ATTENUATION

• value: 0

niFgen_InitExtCal

3. Call niFgen_SetAttributeViInt32 to set the offset DAC value

(niFgen property node: Calibration»Offset DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OFFSET_DAC_VALUE

• value: 32000

4. Repeat steps 5 through 8 for each of the 10 iterations listed in Table 8, changing the Analog Filter Enable, Pre-Amplifier Attenuation, and Current Configuration values for each iteration.

Table 8. Attributes and Values for Main Path Pre-Amplifier Gain

Analog Filter

Iteration

1 VI_FALSE 0 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_0DB

2 VI_FALSE 3 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_3DB

3 VI_FALSE 6 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_6DB

4 VI_FALSE 9 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_9DB

5 VI_FALSE 12 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_12DB

6 VI_TRUE 0 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_0DB

7 VI_TRUE 3 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_3DB

8 VI_TRUE 6 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_6DB

9 VI_TRUE 9 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_9DB

10 VI_TRUE 12 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_12DB

Enable

Pre-Amplifier

Attenuation

5. Call

niFgen_SetAttributeViBoolean to set the analog filter state

Current Configuration

(niFgen property node: Output Attributes»Analog Filter Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_FILTER_ENABLED

• value: The Analog Filter Enable value for the current iteration

from Table 8.

NI PXI-5422 Calibration Procedure 42 ni.com

6. Call niFgen_SetAttributeViReal64 to set the pre-amplifier

attenuation (niFgen property node: Calibration»Pre-Amplifier Attenuation) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_PRE_AMPLIFIER_ATTENUATION

• value: The Pre-Amplifier Attenuation value for the current

iteration from Table 8.

7. Take the following voltage measurements at the NI PXI-5422 CH 0 front panel connector into a high-impedance load:

a. Call

niFgen_SetAttributeViInt32 to set the gain DAC value

(niFgen property node: Calibration»Gain DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_GAIN_DAC_VALUE

• value: 1500

b. Call niFgen_WriteBinary16AnalogStaticValue (niFgen

Write Binary 16 Analog Static Value VI) to set the main DAC value using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• value: 25233

c. Call niFgen_Commit (niFgen Commit VI) to commit the

attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

d. Wait 500 ms for the output to settle.

e. Use the DMM to measure the voltage output by the device. This

measurement is

f. Call

niFgen_SetAttributeViInt32 to set the gain DAC value

measurement 0, which is used in step 8.

(niFgen property node: Calibration»Gain DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_GAIN_DAC_VALUE

• value: 2000

g. Call niFgen_WriteBinary16AnalogStaticValue (niFgen

Write Binary 16 Analog Static Value VI) to set the main DAC value using the following parameters:

• vi: The session handle returned from

• channelName:

"0"

niFgen_InitExtCal

• value: –29232

h. Call niFgen_Commit (niFgen Commit VI) to commit the

attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

i. Wait 500 ms for the output to settle.

j. Use the DMM to measure the voltage output by the device. This

8. Call

measurement is

niFgen_CalAdjustMainPathPreAmpGain (niFgen Cal

measurement 1, which is used in step 8.

Adjust Main Path Pre Amp Gain VI) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• configuration: The Current Configuration value for the current

iteration from Table 8

• mainDACValues: An array containing two elements—the two

values (

25233, –29232) that you set for the main DAC in the

order that you measured them

• gainDACValues: An array containing two elements—the two

values (

1500, 2000) that you set for the gain DAC in the order

that you measured them

• offsetDACValues: An array containing one element—the value

(

32000) that you set for the offset DAC

• measuredOutputs: An array containing two elements—the

two output voltages (

measurement 0, measurement 1) that

you measured in the order that you measured them

NI PXI-5422 Calibration Procedure 44 ni.com

Adjusting the Main Path Post-Amplifier Gain and Offset

1. Call niFgen_WriteBinary16AnalogStaticValue (niFgen Write Binary 16 Analog Static Value VI) to set the main DAC value using the following parameters:

• vi: The session handle returned from

• channelName:

"0"

• value: 0

2. Call niFgen_SetAttributeViBoolean to set the analog filter state (niFgen property node: Output Attributes»Analog Filter Enabled) using the following parameters:

• vi: The session handle returned from

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_FILTER_ENABLED

• value: VI_FALSE

3. Call niFgen_SetAttributeViReal64 to set the pre-amplifier attenuation (niFgen property node: Calibration»Pre-Amplifier Attenuation) using the following parameters:

• vi: The session handle returned from

• channelName: "0"

• attributeID: NIFGEN_ATTR_PRE_AMPLIFIER_ATTENUATION

• value: 0

4. Call niFgen_SetAttributeViInt32 to set the gain DAC value (niFgen property node: Calibration»Gain DAC Value) using the following parameters:

• vi: The session handle returned from

• channelName: "0"

• attributeID: NIFGEN_ATTR_GAIN_DAC_VALUE

• value: 2000

5. Repeat steps 6 through 9 for each of the eight iterations listed in Table 9, changing the Analog Path, Post-Amplifier Attenuation, and Current Configuration values for each iteration.

niFgen_InitExtCal

Table 9. Attributes and Values for the Main Path Post-Amplifier Gain and Offset

Iteration Analog Path

1 NIFGEN_VAL_FIXED_LOW_GAIN_

ANALOG_PATH

2 NIFGEN_VAL_FIXED_LOW_GAIN_

ANALOG_PATH

3 NIFGEN_VAL_FIXED_LOW_GAIN_

ANALOG_PATH

4 NIFGEN_VAL_FIXED_LOW_GAIN_

ANALOG_PATH

5 NIFGEN_VAL_FIXED_HIGH_GAIN_

ANALOG_PATH

6 NIFGEN_VAL_FIXED_HIGH_GAIN_

ANALOG_PATH

7 NIFGEN_VAL_FIXED_HIGH_GAIN_

ANALOG_PATH

Post-Amp

Attenuation

0 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_

LOW_GAIN_0DB

12 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_

LOW_GAIN_12DB

24 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_

LOW_GAIN_24DB

36 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_

LOW_GAIN_36DB

0 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_

HIGH_GAIN_0DB

12 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_

HIGH_GAIN_12DB

24 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_

HIGH_GAIN_24DB

Current Configuration

8 NIFGEN_VAL_FIXED_HIGH_GAIN_

ANALOG_PATH

6. Call niFgen_SetAttributeViInt32 to set the analog path value

(niFgen property node: Output Attributes»Analog Path) using the following parameters:

• vi: The session handle returned from

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_PATH

• value: The Analog Path value for the current iteration from

Tabl e 9

7. Call

niFgen_SetAttributeViReal64 to set the post-amplifier

attenuation (niFgen property node: Calibration»Post-Amplifier Attenuation) using the following parameters:

• vi: The session handle returned from

• channelName: "0"

• attributeID: NIFGEN_ATTR_POST_AMPLIFIER_ATTENUATION

• value: The Post-Amplifier Attenuation value for the current

iteration from Table 9

36 NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_

HIGH_GAIN_36DB

niFgen_InitExtCal

NI PXI-5422 Calibration Procedure 46 ni.com

8. Take the following voltage measurements at the NI PXI-5422 CH 0 front panel connector into a high-impedance load:

a. Call

niFgen_SetAttributeViInt32 to set the offset DAC

value (niFgen property node: Calibration»Offset DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OFFSET_DAC_VALUE

• value: 50000

b. Call niFgen_Commit (niFgen Commit VI) to commit the

attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

c. Wait 500 ms for the output to settle.

d. Use the DMM to measure the voltage output by the device.

This measurement is

e. Call

niFgen_SetAttributeViInt32 to set the offset DAC

measurement 0, which is used in step 9.

value (niFgen property node: Calibration»Offset DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OFFSET_DAC_VALUE

• value: 15000

f. Call niFgen_Commit (niFgen Commit VI) to commit the

attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

g. Wait 500 ms for the output to settle.

h. Use the DMM to measure the voltage output by the device.

This measurement is

measurement 1, which is used in step 9.

9. Call niFgen_CalAdjustMainPathPostAmpGainAndOffset (niFgen Cal Adjust Main Path Post Amp Gain And Offset VI) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• configuration: The Current Configuration value for the current

iteration from Table 9

• mainDACValues: An array containing two elements—the values

(

0, 0) that you set on the main DAC

• gainDACValues: An array containing one element—the value

(

2000) that you set on the gain DAC

• offsetDACValues: An array containing two elements—the two

values (

50000, 15000) that you set on the offset DAC in order

• measuredOutputs: An array containing two elements—the

two output voltages (

measurement 0, measurement 1) that

you measured in order

Adjusting the Direct Path Gain

1. Call niFgen_WriteBinary16AnalogStaticValue (niFgen Write Binary 16 Analog Static Value VI) to set the main DAC value using the following parameters:

• vi: The session handle returned from

• channelName:

"0"

• value: 0

2. Call niFgen_SetAttributeViInt32 to set the gain DAC value (niFgen property node: Calibration»Gain DAC Value) using the following parameters:

• vi: The session handle returned from

• channelName: "0"

• attributeID: NIFGEN_ATTR_GAIN_DAC_VALUE

• value: 2000

3. Call niFgen_SetAttributeViInt32 to set the offset DAC value (niFgen property node: Calibration»Offset DAC Value) using the following parameters:

• vi: The session handle returned from

• channelName: "0"

• attributeID: NIFGEN_ATTR_OFFSET_DAC_VALUE

• value: 32767

niFgen_InitExtCal

NI PXI-5422 Calibration Procedure 48 ni.com

4. Call niFgen_SetAttributeViBoolean to set the analog filter state

(niFgen property node: Output Attributes»Analog Filter Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_FILTER_ENABLED

• value: VI_FALSE

5. Call niFgen_SetAttributeViReal64 to set the pre-amplifier

attenuation (niFgen property node: Calibration»Pre-Amplifier Attenuation) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_PRE_AMPLIFIER_ATTENUATION

• value: 0

6. Call niFgen_SetAttributeViReal64 to set the post-amplifier

attenuation (niFgen property node: Calibration»Post-Amplifier Attenuation) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_POST_AMPLIFIER_ATTENUATION

• value: 0

7. Call niFgen_SetAttributeViReal64 to set the output impedance

(niFgen property node: Basic Operation»Output Impedance) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_IMPEDANCE

• value: 50

8. Call niFgen_SetAttributeViBoolean to enable the analog output

(niFgen property node: Basic Operation»Output Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_ENABLED

• value: VI_TRUE

9. Call niFgen_SetAttributeViInt32 to set the analog path value (niFgen property node: Output Attributes»Analog Path) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_PATH

• value: NIFGEN_VAL_DIRECT_ANALOG_PATH

10. Call niFgen_Commit (niFgen Commit VI) to commit the attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

11. Take the following voltage measurements at the NI PXI-5422 CH 0 front panel connector into a high-impedance load:

a. Call

niFgen_WriteBinary16AnalogStaticValue (niFgen

Write Binary 16 Analog Static Value VI) to set the main DAC value using the following parameters:

• vi: The session handle returned from

• channelName:

"0"

niFgen_InitExtCal

• value: 32767

b. Call niFgen_SetAttributeViInt32 to set the gain DAC value

(niFgen property node: Calibration»Gain DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_GAIN_DAC_VALUE

• value: 1800

c. Call niFgen_Commit (niFgen Commit VI) to commit the

attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

d. Wait 500 ms for the output to settle.

e. Use the DMM to measure the voltage output by the device. This

measurement is

measurement 0, which is used in step 12.

f. Call niFgen_SetAttributeViInt32 to set the gain DAC value

(niFgen property node: Calibration»Gain DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_GAIN_DAC_VALUE

• value: 2600

NI PXI-5422 Calibration Procedure 50 ni.com

g. Call niFgen_Commit (niFgen Commit VI) to commit the

attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

h. Wait 500 ms for the output to settle.

i. Use the DMM to measure the voltage output by the device. This

measurement is

j. Call

niFgen_WriteBinary16AnalogStaticValue (niFgen

measurement 1, which is used in step 12.

Write Binary 16 Analog Static Value VI) to set the main DAC value using the following parameters:

• vi: The session handle returned from

• channelName:

"0"

niFgen_InitExtCal

• value: –32767

k. Call niFgen_SetAttributeViInt32 to set the gain DAC value

(niFgen property node: Calibration»Gain DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_GAIN_DAC_VALUE

• value: 1500

l. Call niFgen_Commit (niFgen Commit VI) to commit the

attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

m. Wait 500 ms for the output to settle.

n. Use the DMM to measure the voltage output by the device. This

measurement is

o. Call

niFgen_SetAttributeViInt32 to set the gain DAC value

measurement 2, which is used in step 12.

(niFgen property node: Calibration»Gain DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_GAIN_DAC_VALUE

• value: 2300

p. Call niFgen_Commit (niFgen Commit VI) to commit the

attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

q. Wait 500 ms for the output to settle.

r. Use the DMM to measure the voltage output by the device. This

measurement is

measurement 3, which is used in step 12.

12. Call niFgen_CalAdjustDirectPathGain (niFgen Cal Adjust Direct Path Gain VI) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• mainDACValues: An array containing two elements—the two

values (

32767, –32767) that you set on the main DAC in order

• gainDACValues: An array containing four elements—the four

values (

1800, 2600, 1500, 2300) that you set on the gain DAC in

order

• measuredOutputs: An array containing four elements—the

four output voltages (

measurement 2, measurement 3) that you measured in order

measurement 0, measurement 1,

Adjusting the Oscillator Frequency

Adjusting the oscillator frequency involves generating a sine wave at a desired frequency, and then iteratively measuring the frequency, passing the measured value to NI-FGEN so that the oscillator can be adjusted, and then re-measuring the resulting frequency. This process is repeated until the difference between the desired and measured frequency falls within the desired tolerance 4.5 ppm. This adjustment ensures the frequency accuracy of the onboard oscillator.

1. Call

2. Call

3. Call niFgen_SetAttributeViReal64 to set the gain (niFgen

niFgen_InitializeOscillatorFrequencyCalibration

(niFgen Initialize Oscillator Frequency Calibration VI) using the following parameter:

• vi: The session handle returned from

niFgen_SetAttributeViReal64 to set the sample rate

niFgen_InitExtCal

(niFgen property node: Arbitrary Waveform Output»Sample Rate) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_SAMPLE_RATE

• value: 200000000

property node: Arbitrary Waveform Output»Arbitrary Waveform Gain) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_GAIN

• value: 1

You can adjust this value based on which measuring device you use.

Note

NI PXI-5422 Calibration Procedure 52 ni.com

4. Call niFgen_SetAttributeViReal64 to set the offset (niFgen

property node: Arbitrary Waveform Output»Arbitrary Waveform Offset) using the following parameters:

• vi: The session handle returned from

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_OFFSET

• value: 0

You can adjust this value based on which measuring device you use.

Note

niFgen_InitExtCal

5. Call

niFgen_SetAttributeViBoolean to set the analog filter state

(niFgen property node: Output Attributes»Analog Filter Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_FILTER_ENABLED

• value: VI_TRUE

6. Call niFgen_SetAttributeViReal64 to set the output impedance

(niFgen property node: Basic Operation»Output Impedance) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_IMPEDANCE

• value: 50

7. Call niFgen_SetAttributeViBoolean to enable the analog output

(niFgen property node: Basic Operation»Output Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_ENABLED

• value: VI_TRUE

8. Generate an array of waveform samples.

Each waveform should have 20 samples per cycle, with a total of 500 samples and 25 sine wave cycles. Because you set the sample rate to 200 MS/s and because there are 20 samples per cycle, the resulting waveform is a 10 MHz sine wave. The sample values of this waveform must fall between –1.0 and 1.0.

9. Call niFgen_CreateArbWaveform (niFgen Create Arbitrary Waveform VI) using the following parameters:

• vi: The session handle returned from

• wfmSize: The size in samples (

niFgen_InitExtCal

500) of the waveform you created

in step 8

• wfmData: The array of waveform samples that you created in

step 8

• wfmHandle: The variable passed by reference through this

parameter receives the value (waveform handle) that identifies the waveform created by this function.

10. Call

niFgen_SetAttributeViInt32 to choose the sine waveform

(niFgen property node: Arbitrary Waveform Output»Arbitrary Waveform Handle) using the following parameters:

• vi: The session handle returned from

niFgen_init

• channelName: "0"

• attributeID: NIFGEN_ATTR_ARB_WAVEFORM_HANDLE

• value: The wfmHandle from step 9 (sine waveform handle)

11. Call

niFgen_InitiateGeneration (niFgen Initiate Generation VI)

to initiate the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

12. Measure the frequency of the generated waveform. This value is the

measured frequency, which is used in step 13.

13. Repeat steps 13a through 13d for as long as the difference between the measured frequency and the desired frequency (10 MHz) is greater than the tolerance (4.5 ppm).

The measured frequency should converge on the desired frequency. If the measured frequency does not converge on the desired frequency within 16 iterations, a problem may exist with your measurement device or the NI PXI-5422.

a. Call

niFgen_AbortGeneration (niFgen Abort Generation VI)

to abort the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

b. Call niFgen_CalAdjustOscillatorFrequency (niFgen Cal

Adjust Oscillator Frequency VI) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• desiredFrequencyInHz: The desired frequency (10000000)

of the generated sinusoid in Hz

• measuredFrequencyInHz: The

measured frequency of

the generated sinusoid in Hz

NI PXI-5422 Calibration Procedure 54 ni.com

c. Call niFgen_InitiateGeneration (niFgen Initiate

Generation VI) to initiate the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

d. Measure the frequency of the generated waveform. This value is

the

measured frequency.

14. Call

niFgen_AbortGeneration (niFgen Abort Generation VI) to

abort the waveform generation using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

Adjusting the Calibration ADC

The NI PXI-5422 has an onboard calibration ADC that is used during self-calibration. Adjusting the calibration ADC involves characterizing the gain and offset associated with this ADC so that performing self-calibration results in an accurately calibrated device.

1. Call

2. Call niFgen_WriteBinary16AnalogStaticValue (niFgen Write

3. Call niFgen_SetAttributeViInt32 to set the analog path value

4. Call niFgen_SetAttributeViInt32 to set the gain DAC value

niFgen_InitializeCalADCCalibration (niFgen Initialize

Cal ADC Calibration VI) using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

Binary 16 Analog Static Value VI) to set the main DAC value using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• value: 0

(niFgen property node: Output Attributes»Analog Path) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_PATH

• value: NIFGEN_VAL_FIXED_LOW_GAIN_ANALOG_PATH

(niFgen property node: Calibration»Gain DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_GAIN_DAC_VALUE

• value: 1700

5. Call niFgen_SetAttributeViInt32 to set the offset DAC value (niFgen property node: Calibration»Offset DAC Value) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OFFSET_DAC_VALUE

• value: 32767

6. Call niFgen_SetAttributeViBoolean to set the analog filter state (niFgen property node: Output Attributes»Analog Filter Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_ANALOG_FILTER_ENABLED

• value: VI_FALSE

7. Call niFgen_SetAttributeViReal64 to set the pre-amplifier attenuation (niFgen property node: Calibration»Pre-Amplifier Attenuation) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_PRE_AMPLIFIER_ATTENUATION

• value: 0

8. Call niFgen_SetAttributeViReal64 to set the post-amplifier attenuation (niFgen property node: Calibration»Post-Amplifier Attenuation) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_POST_AMPLIFIER_ATTENUATION

• value: 0

9. Call niFgen_SetAttributeViReal64 to set the output impedance (niFgen property node: Basic Operation»Output Impedance) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_IMPEDANCE

• value: 50

10. Call niFgen_SetAttributeViBoolean to enable the analog output (niFgen property node: Basic Operation»Output Enabled) using the following parameters:

NI PXI-5422 Calibration Procedure 56 ni.com

• vi: The session handle returned from niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_ENABLED

• value: VI_TRUE

11. Call niFgen_Commit (niFgen Commit VI) to commit the attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

12. Wait 500 ms for the output to settle.

13. Call

niFgen_SetAttributeViInt32 to set the calibration ADC

input (niFgen property node: Calibration»Cal ADC Input) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "" (empty string)

• attributeID:

NIFGEN_ATTR_CAL_ADC_INPUT

• value: NIFGEN_VAL_ANALOG_OUTPUT

14. Call niFgen_WriteBinary16AnalogStaticValue (niFgen Write Binary 16 Analog Static Value VI) to set the main DAC value using the following parameters:

• vi: The session handle returned from

• channelName:

"0"

niFgen_InitExtCal

• value: 27232

15. Call niFgen_SetAttributeViBoolean to disable the analog output (niFgen property node: Basic Operation»Output Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_ENABLED

• value: VI_FALSE

16. Call niFgen_Commit (niFgen Commit VI) to commit the attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

17. Wait 500 ms for the output to settle.

18. Call niFgen_ReadCalADC (niFgen Read CAL ADC VI) to measure the analog output voltage with the onboard calibration ADC using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• numberOfReadsToAverage: 3

• returnCalibratedValue: VI_FALSE

• calADCValue: A ViReal64 variable. The variable passed by

reference through this parameter receives the voltage measured by the onboard ADC. This value is

cal ADC measurement 0,

which is used in step 32.

19. Call

niFgen_SetAttributeViBoolean to enable the analog output

(niFgen property node: Basic Operation»Output Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_ENABLED

• value: VI_TRUE

20. Call niFgen_Commit (niFgen Commit VI) to commit the attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

21. Wait 500 ms for the output to settle.

22. Use the DMM to measure the NI PXI-5422 voltage output directly into the DMM into a high-impedance load. This measurement is

external measurement 0, which is used in step 32.

23. Call

niFgen_WriteBinary16AnalogStaticValue (niFgen Write

Binary 16 Analog Static Value VI) to set the main DAC value using the following parameters:

• vi: The session handle returned from

• channelName:

"0"

niFgen_InitExtCal

• value: 10232

24. Call niFgen_SetAttributeViBoolean to disable the analog output (niFgen property node: Basic Operation»Output Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_ENABLED

• value: VI_FALSE

25. Call niFgen_Commit (niFgen Commit VI) to commit the attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

26. Wait 500 ms for the output to settle.

NI PXI-5422 Calibration Procedure 58 ni.com

27. Call niFgen_ReadCalADC (niFgen Read CAL ADC VI) to measure the analog output voltage with the onboard calibration ADC using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• numberOfReadsToAverage: 3

• returnCalibratedValue: VI_FALSE

• calADCValue: A ViReal64 variable. The variable passed by

reference through this parameter receives the voltage measured

28. Call

by the onboard calibration ADC. This value is

measurement 1

niFgen_SetAttributeViBoolean to enable the analog output

, which is used in step 32.

cal ADC

(niFgen property node: Basic Operation»Output Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_ENABLED

• value: VI_TRUE

29. Call niFgen_Commit (niFgen Commit VI) to commit the attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

30. Wait 500 ms for the output to settle.

31. Use the DMM to measure the NI PXI-5422 voltage output directly into the DMM (into a high-impedance load). This measurement be

external measurement 1, which is used in step 32.

32. Call

niFgen_CalAdjustCalADC (niFgen Cal Adjust Cal ADC VI)

using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• voltagesMeasuredExternally: An array containing two

elements—the two voltages (

external measurement 1) that you measured with the

external measurement 0,

DMM in order

• voltagesMeasuredWithCalADC: An array containing two

elements—the two voltages (

cal ADC measurement 1) that you measured with the onboard

cal ADC measurement 0,

calibration ADC in the order that you measured them

33. Call niFgen_SetAttributeViBoolean to disable the analog

output (niFgen property node: Basic Operation»Output Enabled) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "0"

• attributeID: NIFGEN_ATTR_OUTPUT_ENABLED

• value: VI_FALSE

34. Call niFgen_SetAttributeViInt32 to set the calibration ADC

input (niFgen property node: Calibration»Cal ADC Input) using the following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• channelName: "" (empty string)

• attributeID:

NIFGEN_ATTR_CAL_ADC_INPUT

• value: NIFGEN_VAL_GROUND

35. Call niFgen_Commit (niFgen Commit VI) to commit the attribute values to the device using the following parameter:

• vi: The session handle returned from

niFgen_InitExtCal

Closing the External Adjustment Session

When you have completed all the adjustment stages, you must close the external adjustment session to store the new calibration constants in the onboard EEPROM.

Call

niFgen_CloseExtCal (niFgen Close Ext Cal VI) using the

following parameters:

• vi: The session handle returned from

niFgen_InitExtCal

• action:

– If the external adjustment procedure completed without any

errors, use

NIFGEN_VAL_EXT_CAL_COMMIT. This function

stores the new calibration constants, updated calibration dates, updated calibration temperatures in the onboard EEPROM.

– If any errors occurred during the external adjustment

procedure, or if you want to abort the operation, use

NIFGEN_VAL_EXT_CAL_ABORT. This function discards

the new calibration constants and does not change any of the calibration data stored in the onboard EEPROM.

NI PXI-5422 Calibration Procedure 60 ni.com

Calibration Utilities

NI-FGEN supports several calibration utilities that allow you to retrieve information about adjustments performed on the NI PXI-5422, restore an external calibration, change the external calibration password, and store small amounts of information in the onboard EEPROM. You can retrieve some data using MAX or the FGEN SFP; however, you can retrieve all the data using NI-FGEN.

MAX

To retrieve data using MAX, complete the following steps:

1. Launch MAX.

2. Select the device from which you want to retrieve information from

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

3. Select the Calibration Tab on the lower right corner.

You should see information about the last dates and temperature for both external and self-calibration.

FGEN SFP

To retrieve data using the FGEN SFP, complete the following steps:

1. Launch the FGEN SFP.

2. Select the device from which you want to retrieve information using

the Device Configuration dialog box (Edit»Device Configuration).

3. Open the Calibration dialog box (Utility»Calibration).

You should see information about the last dates of both external and self-calibration.

NI-FGEN

NI-FGEN provides a full complement of calibration utility functions and VIs. Refer to the NI Signal Generators Help for the complete function reference. The utility functions include:

•

niFgen_RestoreLastExtCalConstants

• niFgen_GetSelfCalSupported

• niFgen_GetSelfCalLastDateAndTime

• niFgen_GetExtCalLastDateAndTime

• niFgen_GetSelfCalLastTemp

• niFgen_GetExtCalLastTemp

• niFgen_GetExtCalRecommendedInterval

• niFgen_ChangeExtCalPassword

• niFgen_SetCalUserDefinedInfo

• niFgen_GetCalUserDefinedInfo

• niFgen_GetCalUserDefinedInfoMaxSize

NI PXI-5422 Calibration Procedure 62 ni.com

Where to Go for Support

The National Instruments Web site is your complete resource for technical support. At troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers.

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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 instructions or dial 512 795 8248. For telephone support outside the United States, contact your local branch office:

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371058B-01 May05

National Instruments NI PXI-5422 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Conventions

Introduction

What Is Calibration?

Self-Calibration

External Calibration

Why Should You Calibrate?

How Often Should You Calibrate?

Software and Documentation Requirements

Software

Table 1. Calibration File Locations

Documentation

Self-Calibration Procedures

FGEN Soft Front Panel

NI-FGEN

External Calibration Options

Complete Calibration

Figure 1. Complete Calibration Programming Flow

Optional Calibration

Figure 2. Optional Calibration Programming Flow

External Calibration Requirements

Test Equipment

Table 2. Equipment Required for Calibrating the NI PXI-5422

Test Conditions

External Calibration Procedures

Writing Your Calibration Procedure

Calibration Procedures in LabVIEW

Calibration Procedures in LabWindows/CVI

Calibration Procedures in C

Verifying NI PXI-5422 Specifications

Figure 3. NI PXI-5422 Front Panel Connectors

Verifying the Oscillator Frequency Accuracy

Table 3. Frequency Ranges

Verifying the DC Gain and Offset Accuracy

Table 4. Values for Verifying the Gain of the Main Analog Path

Table 5. Values for Verifying the Offset of the Main Analog Path

Table 6. Values for Verifying the Gain of the Direct Analog Path

Adjusting the NI PXI-5422

Figure 4. NI PXI-5422 External Calibration Procedure

Initializing the External Calibration Session

Adjusting the Analog Output

Table 7. Attributes and Values for Main Path Pre-Amplifier Offset

Table 8. Attributes and Values for Main Path Pre-Amplifier Gain

Table 9. Attributes and Values for the Main Path Post-Amplifier Gain and Offset

Adjusting the Oscillator Frequency

Adjusting the Calibration ADC

Closing the External Adjustment Session

Calibration Utilities

FGEN SFP

NI-FGEN

Where to Go for Support