National Instruments NI 6738 Handbuch

PXIe-6738

CALIBRATION PROCEDURE

NI 6738/6739

Analog Output Devices and Modules with NI-DAQmx

This document contains the verification and adjustment procedures for the National Instruments

PCIe-6738 and PXIe-6738/6739 analog output devices and modules. For more information

about calibration solutions, visit ni.com/calibration.

Contents

Software.................................................................................................................................... 1

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

Password................................................................................................................................... 2

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

Switch Maintenance ................................................................................................................. 5

NI PXI/PXIe-2529 Switch Performance Test .................................................................. 5

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

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

Device Setup............................................................................................................. 6

Test Conditions......................................................................................................................... 6

Calibration Procedure ............................................................................................................... 7

Initial Setup............................................................................................................................... 7

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

Checking Device Temperature Changes .......................................................................... 8

Verification ............................................................................................................................... 9

Analog Output Verification .............................................................................................. 9

Counter Verification ......................................................................................................... 22

Adjustment................................................................................................................................ 24

EEPROM Update ..................................................................................................................... 25

Reverification ........................................................................................................................... 25

Test Limits ................................................................................................................................ 26

Worldwide Support and Services ............................................................................................. 27

Software

Calibrating NI 6738/6739 devices and modules requires the installation of NI-DAQmx on the

calibration system. You must use NI-DAQmx 17.6 or later. Refer to the NI-DAQmx Readme to

ensure support for the device you want to calibrate. You can download NI-DAQmx from

ni.com/downloads. NI-DAQmx supports many programming languages, including

LabVIEW, LabWindows™/CVI™, C/C++, C#, and Visual Basic .NET. When you install

NI-DAQmx, you need to only install support for the application software that you intend to use.

2|ni.com |NI 6738/6739 Calibration Procedure

Documentation

Consult the following documents for information about your NI 6738/6739, NI-DAQmx, and

your application software. All documents are available on ni.com, and help files install with

the software.

Password

The default password for password-protected operations is NI.

The DAQ Getting Started Guide for your device or module

These guides provide instructions for installing the NI 6738/6739 with

NI-DAQmx.

NI 6738/6739 User Manual

The user manual provides information about your NI 6738/6739 device.

Your 673x Device Specifications

The specifications document for your DAQ device provides detailed specifications,

including the device calibration interval.

NI-DAQmx Readme

Operating system and application software support in NI-DAQmx.

NI-DAQmx Help

Information about creating applications that use the NI-DAQmx driver.

LabVIEW Help

LabVIEW programming concepts and reference information about NI-DAQmx

VIs and functions.

NI-DAQmx C Reference Help

Reference information for NI-DAQmx C functions and NI-DAQmx C properties.

NI-DAQmx .NET Help Support for Visual Studio

Reference information for NI-DAQmx .NET methods and NI-DAQmx .NET

properties, key concepts, and a C enum to .NET enum mapping table.

NI 6738/6739 Calibration Procedure |© National Instruments |3

Test Equipment

Table 1 lists the equipment recommended for the performance verification and adjustment

procedures. If the recommended equipment is not available, select a substitute using the

requirements listed in Table 1.

Notice For compliance with Electromagnetic Compatibility (EMC) requirements,

this product must be operated with shielded cables and accessories. If unshielded

cables or accessories are used, the EMC specifications are no longer guaranteed

unless all unshielded cables and/or accessories are installed in a shielded enclosure

with properly designed and shielded input/output ports.

Table 1. Recommended Equipment

Equipment

Recommended

Models Where Used Requirements

DMM NI 4070*Analog Output

Verification

and

Adjustment

If this instrument is

unavailable, use a multiranging

6 1/2-digit DMM with an

accuracy of 40 ppm or better.

Counter Agilent 53131A or

Agilent 53220A

Counter

Verification

Whether using the

recommended instrument or

another counter, you must

ensure that it is configured to

achieve an accuracy of

12.5 ppm (0.00125%) or

better.

PXI Express

chassis

NI PXIe-1062Q —Use with NI PXIe-6738/6739

modules.

Shielded

DAQ cable

NI SHC68-68-A2 —Use with NI 6738/6739

modules.

NI SH68-C68-S —Use when connecting signals

using the NI 6738 Adapter or

NI 6739 Adapter.

4|ni.com |NI 6738/6739 Calibration Procedure

DAQ

accessory

NI SCB-68,

NI SCB-68A

—Shielded I/O connector block

with 68 screw terminals for

easy signal connection to the

NI 6738/6739.

NI CB-68LP,

NI CB-68LPR,

NI TBX-68

—Low-cost termination

accessories with 68 screw

terminals for easy connection

of field I/O signals to the

NI 6738/6739.

DAQ switch

fixture†

NI PXI/PXIe-2529 (x2) —128-Crosspoint, 2-Wire

PXI Matrix Switch Module

NI TB-2636 terminal

blocks (x2)

—Configures the PXI/PXIe-2529

as a 4x32 (2-wire) matrix

Notice Before using

this unshielded

accessory, determine if

the documentation for

the connected device

requires shielded cables

or accessories. Do not

use this product unless it

is installed in a shielded

enclosure with properly

designed and shielded

input/output ports and is

connected to the

NI product using a

shielded cable.

NI SHC68-NT-S

cables (x2)

—Shielded Cable Assembly

(Unterminated), 2 m

*If you are using the NI 4070, ensure that it is set to the 10 V range.

†Locally constructed fixture to facilitate calibration using Calibration Executive.

Table 1. Recommended Equipment (Continued)

Equipment

Recommended

Models Where Used Requirements

NI 6738/6739 Calibration Procedure |© National Instruments |5

Switch Maintenance

To ensure proper operation of the switches used in this procedure, you must periodically test

their performance.

NI PXI/PXIe-2529 Switch Performance Test

Use the following procedure to test the performance of the PXI/PXIe-2529 using Calibration

Executive.

Test Equipment

The following table lists the test instruments required for testing the NI PXI/PXIe-2529.

The switch performance tests should be executed periodically to check if any switch paths have

become damaged, or if the switches are approaching the end of their useful life. The frequency

of execution of these tests will depend on many factors, including how often the switches are

used.

Test Conditions

The following setup and environmental conditions are required to ensure the NI PXI/PXIe-2529

meets published specifications.

• Keep connections to the device as short as possible. Long cables and wires act as antennae,

picking up extra noise that can affect measurements.

• Verify that all connections to the device are secure.

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

eliminate noise and thermal offsets.

Table 2. Calibration Executive Procedure Features

Adjustment Manual Mode Selectable Test Points

Not supported Supported Not supported

Table 3. Approximate Test Time

Module Performance Test

PXI/PXIe-2529 8 minutes

Instrument Recommended Model Requirements

DMM PXI-4071 Voltage Accuracy: 7.5 digits

Resistance Accuracy: 6.5 digits

Terminal Block PXI/PXIe-2529: TB-2636 —

6|ni.com |NI 6738/6739 Calibration Procedure

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

than the ambient temperature.

• Keep relative humidity below 80%.

Device Setup

1. Configure the hardware using Measurement & Automation Explorer (MAX).

2. Launch the Calibration Executive procedure and complete the setup wizard. For

information, refer to ni.com/r/loadcalpro.

3. Complete the following steps to create fixtures that will be used to connect the switches to

the DMM.

Create the NI PXI/PXIe-2529 Fixture

1. On the TB-2636, connect the positive (+) and negative (-) terminals together for C0–C31.

2. Connect all + terminals together for R0 to R3, and wire them out using two separate wires

to banana connectors labeled DMM HI and DMM HI Sense.

3. Connect all - terminals together for R0 to R3, and wire them out using two separate wires

to banana connectors labeled DMM LO and DMM LO Sense.

To run the procedure, connect the TB-2636 to the PXI/PXIe-2529 switch, and connect the four

banana connectors to the appropriate terminals on the DMM.

Test Limit Equations

These switch tests are not intended to be a validation of the full warranted performance of these

devices. The parameters and limits used in these tests are based on the measurement

requirements of this procedure.

Test Conditions

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

• Keep connections to the device as short as possible. Long cables and wires can act as

antennae, which could pick up extra noise that would affect measurements.

• Verify that all connections to the NI 6738/6739 are secure.

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

eliminate noise and thermal offsets.

• Maintain an ambient temperature of 23 °C ±5 °C throughout the Analog Output

Verification procedure. The device temperature is greater than the ambient temperature.

Refer to the Calibration Procedure section for more information about calibration

temperatures and temperature drift.

Table 4. NI PXI-PXIe-2529 Test Limits

Thermal EMF Path Resistance Relay Count

±9 V<1 For all relays (0–127), <100,000 for each

NI 6738/6739 Calibration Procedure |© National Instruments |7

• For valid test limits, maintain the device temperature within ±1 °C from the last

self-calibration and ±10 °C from the last external calibration.

• Keep relative humidity below 80%.

• Allow adequate warm-up time of at least 15 minutes to ensure that the measurement

circuitry is at a stable operating temperature.

Calibration Procedure

The calibration process has the following steps.

1. Initial Setup—Configure your device in NI-DAQmx, adjust the self-calibration constants

of the device, and verify that the current device temperature does not cause you to

incorrectly calibrate your device.

2. Verification—Verify the existing operation of the device. This step allows you to confirm

that the device was operating within its specified range prior to calibration.

3. Adjustment—Perform an external calibration that adjusts the device calibration constants

with respect to a known voltage source.

4. EEPROM Update—When an adjustment procedure is completed, the NI 6738/6739

internal calibration memory (EEPROM) is immediately updated. If you do not want to

perform an adjustment, you can update the calibration date without making any

adjustments.

5. Reverification—Perform another verification to ensure that the device is operating within

its specifications after adjustment.

These steps are described in detail in the following sections.

Initial Setup

Refer to your device getting started guide for information about how to install the software and

hardware and how to configure the device in Measurement & Automation Explorer (MAX).

Note When a device is configured in MAX, it is assigned a device name. Each

function call uses this device name to determine which device to calibrate. This

document uses Dev_name to refer to the device name. In the following procedures,

use the device name as it appears in MAX.

Complete the following steps to set up the NI 6738/6739.

1. Install the application software (if applicable).

2. Install the NI-DAQmx driver software.

3. Power off the chassis that will contain the device and install the device.

4. Power on the chassis and launch MAX.

5. Select My System»Devices and Interfaces»your device.

6. Configure the device identifier and select Self-Test to ensure that the device is working

properly.

8|ni.com |NI 6738/6739 Calibration Procedure

Self-Calibration

Complete the following steps to self-calibrate the device.

Note Disconnect all external signals before beginning self-calibration.

1. Wait for the device to warm-up for at least 15 minutes.

2. Launch MAX.

3. Select My System»Devices and Interfaces»your device.

4. Click Self-Calibrate.

Checking Device Temperature Changes

Device temperature changes greater than those described in the Test Conditions section will

require action to ensure that your calibration is successful. Complete the following steps to check

for device temperature changes:

1. Self-calibrate your device as described in the Self-Calibration section.

2. Call DAQmxGetCalDevTemp with the following parameter:

•deviceName: Dev_name

3. Call DAQmxGetSelfCalLastTemp with the following parameter:

•deviceName: Dev_name

If the current device temperature differs by more than 1 °C from the last self-calibration

temperature, or you cannot maintain a device temperature within 1 °C of the last

self-calibration temperature throughout the verification process, the calibration limits for

the devices that support self-calibration are not valid.

In order to successfully calibrate your device in this case:

• Allow the device temperature to settle and self-calibrate your device again.

• Change the test limits to include the additional error due to temperature drift. Refer to

your device specifications document for more information.

4. Call DAQmxGetExtCalLastTemp with the following parameter:

•deviceName: Dev_name

If the current device temperature differs by more than 10 °C from the last external

calibration temperature, or you cannot maintain a device temperature within 10 °C of the

last external calibration temperature throughout the verification process, the calibration

limits are not valid.

In order to successfully calibrate your device in this case:

• Change the system so that the temperature is within ±10 °C of the temperature

recorded during the last external calibration.

• Change the test limits to include the additional error due to temperature drift. Refer to

your device specifications document for more information.

NI 6738/6739 Calibration Procedure |© National Instruments |9

Note You also can read the current device temperature, the temperature during the

last self-calibration, and the temperature during the last external calibration in MAX.

Launch MAX, select My System»Devices and Interfaces»your device, and then

click the Calibration tab. Temperature information is displayed Self-Calibration and

External Calibration sections of the Settings tab.

Verification

The following performance verification procedures describe the sequence of operation and

provide test points required to verify the NI 6738/6739. The verification procedures assume that

adequate traceable uncertainties are available for the calibration references.

The verification procedure is divided into the major functions of the device. Throughout the

verification process, use the tables in the Test Limits section to determine if your device needs

to be adjusted. These tables show all acceptable settings for the device.

Analog Output Verification

The NI 6738 has 32 analog outputs, AO <0..31>. The NI 6739 has 64 analog outputs, AO <0..63>.

Note Table 7, NI 6738/6739 Analog Output Values, is based upon the most recent

edition of the specifications document for your device. Refer to the most recent

specifications document online at ni.com/manuals.

Note The test limits used in this document assume a maximum temperature drift of

±10 °C from the last external calibration, and a maximum temperature drift of ±1 °C

from the last self-calibration. Refer to the Checking Device Temperature Changes

section for more information and instructions on reading your device temperature and

comparing it against the device temperature during the last external calibration.

Notice Do not perform analog output verification and counter verification

simultaneously, as the multiple signal connections will produce noise that can affect

measurements.

Complete the following steps to check analog output measurements.

1. Connect your DMM to AO 0 as shown in Table 5, Analog Output Connections. If using the

DAQ switch fixture, configure your connections as shown in Table 6, Switch Fixture

Connection Details.

Note If you are using the NI 4070, ensure that it is set to the 10 V range.

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