National Instruments 6738 Manual

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

Test Conditions......................................................................................................................... 4

Calibration Procedure ............................................................................................................... 4

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

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

Checking Device Temperature Changes .......................................................................... 6

Verification ............................................................................................................................... 7

Analog Output Verification .............................................................................................. 7

Counter Verification ......................................................................................................... 11

Adjustment................................................................................................................................ 12

EEPROM Update ..................................................................................................................... 14

Reverification ........................................................................................................................... 14

Test Limits ................................................................................................................................ 15

Worldwide Support and Services ............................................................................................. 16

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.

Caution 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 53220A Counter

Verification

Whether using the recommended

instrument or another counter, you

must ensure that it is configured to

be at least 12.5 ppm (0.00125%)

accurate.

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.

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.

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

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

• 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.

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

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.

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.

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

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.

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.

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

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 3, 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.

Caution 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 2, Analog Output Connections.

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

Table 2. Analog Output Connections

Analog

Output*

DMM

Positive Input Negative Input

AO 0 Connector 0, AO 0 (pin 10) Connector 0, AO GND 0/1 (pin 11)

AO 1 Connector 0, AO 1 (pin 44) Connector 0, AO GND 0/1 (pin 11)

AO 2 Connector 0, AO 2 (pin 45) Connector 0, AO GND 2/3 (pin 39)

AO 3 Connector 0, AO 3 (pin 12) Connector 0, AO GND 2/3 (pin 39)

AO 4 Connector 0, AO 4 (pin 13) Connector 0, AO GND 4/5 (pin 41)

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

AO 5 Connector 0, AO 5 (pin 47) Connector 0, AO GND 4/5 (pin 41)

AO 6 Connector 0, AO 6 (pin 48) Connector 0, AO GND 6/7 (pin 49)

AO 7 Connector 0, AO 7 (pin 15) Connector 0, AO GND 6/7 (pin 49)

AO 8 Connector 0, AO 8 (pin 16) Connector 0, AO GND 8/9/10 (pin 50)

AO 9 Connector 0, AO 9 (pin 17) Connector 0, AO GND 8/9/10 (pin 50)

AO 10 Connector 0, AO 10 (pin 51) Connector 0, AO GND 8/9/10 (pin 50)

AO 11 Connector 0, AO 11 (pin 52) Connector 0, AO GND 11 (pin 18)

AO 12 Connector 0, AO 12 (pin 53) Connector 0, AO GND 12/13 (pin 20)

AO 13 Connector 0, AO 13 (pin 54) Connector 0, AO GND 12/13 (pin 20)

AO 14 Connector 0, AO 14 (pin 21) Connector 0, AO GND 14/15 (pin 55)

AO 15 Connector 0, AO 15 (pin 22) Connector 0, AO GND 14/15 (pin 55)

AO 16 Connector 0, AO 16 (pin 23) Connector 0, AO GND 16/17 (pin 24)

AO 17 Connector 0, AO 17 (pin 57) Connector 0, AO GND 16/17(pin 24)

AO 18 Connector 0, AO 18 (pin 58) Connector 0, AO GND 18/19 (pin 59)

AO 19 Connector 0, AO 19 (pin 25) Connector 0, AO GND 18/19 (pin 59)

AO 20 Connector 0, AO 20 (pin 26) Connector 0, AO GND 20/21 (pin 27)

AO 21 Connector 0, AO 21 (pin 60) Connector 0, AO GND 20/21 (pin 27)

AO 22 Connector 0, AO 22 (pin 61) Connector 0, AO GND 22/23 (pin 62)

AO 23 Connector 0, AO 23 (pin 28) Connector 0, AO GND 22/23 (pin 62)

AO 24 Connector 0, AO 24 (pin 29) Connector 0, AO GND 24/25 (pin 30)

AO 25 Connector 0, AO 25 (pin 63) Connector 0, AO GND 24/25 (pin 30)

AO 26 Connector 0, AO 26 (pin 64) Connector 0, AO GND 26/27 (pin 65)

AO 27 Connector 0, AO 27 (pin 31) Connector 0, AO GND 26/27 (pin 65)

AO 28 Connector 0, AO 28 (pin 32) Connector 0, AO GND 28/29 (pin 33)

AO 29 Connector 0, AO 29 (pin 66) Connector 0, AO GND 28/29 (pin 33)

AO 30 Connector 0, AO 30 (pin 67) Connector 0, AO GND 30/31 (pin 68)

Table 2. Analog Output Connections (Continued)

Analog

Output*

DMM

Positive Input Negative Input

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

AO 31 Connector 0, AO 31 (pin 34) Connector 0, AO GND 30/31 (pin 68)

AO 32 Connector 1, AO 32 (pin 10) Connector 1, AO GND 32/33 (pin 11)

AO 33 Connector 1, AO 33 (pin 44) Connector 1, AO GND 32/33 (pin 11)

AO 34 Connector 1, AO 34 (pin 45) Connector 1, AO GND 34/35 (pin 46)

AO 35 Connector 1, AO 35 (pin 12) Connector 1, AO GND 34/35 (pin 46)

AO 36 Connector 1, AO 36 (pin 13) Connector 1, AO GND 36/37 (pin 14)

AO 37 Connector 1, AO 37 (pin 47) Connector 1, AO GND 36/37 (pin 14)

AO 38 Connector 1, AO 38 (pin 48) Connector 1, AO GND 38/39 (pin 49)

AO 39 Connector 1, AO 39 (pin 15) Connector 1, AO GND 38/39 (pin 49)

AO 40 Connector 1, AO 40 (pin 16) Connector 1, AO GND 40/41/42 (pin 50)

AO 41 Connector 1, AO 41 (pin 17) Connector 1, AO GND 40/41/42 (pin 50)

AO 42 Connector 1, AO 42 (pin 51) Connector 1, AO GND 40/41/42 (pin 50)

AO 43 Connector 1, AO 43 (pin 52) Connector 1, AO GND 43 (pin 18)

AO 44 Connector 1, AO 44 (pin 53) Connector 1, AO GND 44/45 (pin 20)

AO 45 Connector 1, AO 45 (pin 54) Connector 1, AO GND 44/45 (pin 20)

AO 46 Connector 1, AO 46 (pin 21) Connector 1, AO GND 46/47 (pin 55)

AO 47 Connector 1, AO 47 (pin 22) Connector 1, AO GND 46/47 (pin 55)

AO 48 Connector 1, AO 48 (pin 23) Connector 1, AO GND 48/49 (pin 24)

AO 49 Connector 1, AO 49 (pin 57) Connector 1, AO GND 48/49 (pin 24)

AO 50 Connector 1, AO 50 (pin 58) Connector 1, AO GND 50/51 (pin 59)

AO 51 Connector 1, AO 51 (pin 25) Connector 1, AO GND 50/51 (pin 59)

AO 52 Connector 1, AO 52 (pin 26) Connector 1, AO GND 52/53 (pin 27)

AO 53 Connector 1, AO 53 (pin 60) Connector 1, AO GND 52/53 (pin 27)

AO 54 Connector 1, AO 54 (pin 61) Connector 1, AO GND 54/55 (pin 62)

AO 55 Connector 1, AO 55 (pin 28) Connector 1, AO GND 54/55 (pin 62)

AO 56 Connector 1, AO 56 (pin 29) Connector 1, AO GND 56/57 (pin 30)

Table 2. Analog Output Connections (Continued)

Analog

Output*

DMM

Positive Input Negative Input

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

2. Measure the internal device temperature and perform self-calibration if necessary. Refer to

the Checking Device Temperature Changes section for more information.

3. Call DAQmxCreateTask with the following parameters:

•taskName:

MyAOVoltageTask

•taskHandle: &taskHandle

4. Call DAQmxCreateAOVoltageChan with the following parameters.

•taskHandle: taskHandle

•physicalChannel: Dev_name/ao0

•nameToAssignToChannel: AOVoltageChannel

•minVal:

-10.0

•maxVal:

10.0

•units: DAQmx_Val_Volts

•customScaleName: NULL

5. Call DAQmxStartTask with the following parameter:

•taskHandle: taskHandle

6. Call DAQmxWriteAnalogF64 with the following parameters, using a Test Point from

Table 3, NI 6738/6739 Analog Output Values.

•taskHandle: taskHandle

•numSampsPerChan: 1

•autoStart: 1

•timeout: 10.0

•dataLayout: DAQmx_Val_GroupByChannel

•writeArray: &data

AO 57 Connector 1, AO 57 (pin 63) Connector 1, AO GND 56/57 (pin 30)

AO 58 Connector 1, AO 58 (pin 64) Connector 1, AO GND 58/59 (pin 65)

AO 59 Connector 1, AO 59 (pin 31) Connector 1, AO GND 58/59 (pin 65)

AO 60 Connector 1, AO 60 (pin 32) Connector 1, AO GND 60/61 (pin 33)

AO 61 Connector 1, AO 61 (pin 66) Connector 1, AO GND 60/61 (pin 33)

AO 62 Connector 1, AO 62 (pin 67) Connector 1, AO GND 62/63 (pin 68)

AO 63 Connector 1, AO 63 (pin 34) Connector 1, AO GND 62/63 (pin 68)

*Connector 1/AO <32..63> are on the PXIe-6739 only.

Table 2. Analog Output Connections (Continued)

Analog

Output*

DMM

Positive Input Negative Input

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