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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
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
LabVIEW, LabWindows
NI-DAQmx, you need to only install support for the application software that you intend to use.
ni.com/calibration
. NI-DAQmx supports many programming languages, including
™
™
/CVI
, C/C++, C#, and Visual Basic .NET. When you install
.
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Related Manuals for National Instruments 6738
Summary of Contents for National Instruments 6738
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Page 1: Table Of Contents
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 . -
Page 2: Documentation
Documentation Consult the following documents for information about your NI 6738/6739, NI-DAQmx, and your application software. All documents are available on , and help files install with ni.com the software. The DAQ Getting Started Guide for your device or module These guides provide instructions for installing the NI 6738/6739 with NI-DAQmx. -
Page 3: Test Equipment
68 screw terminals for easy NI TBX-68 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. NI 6738/6739 Calibration Procedure | © National Instruments | 3... -
Page 4: Test Conditions
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. -
Page 5: Initial Setup
In the following procedures, Dev_name use the device name as it appears in MAX. Complete the following steps to set up the NI 6738/6739. Install the application software (if applicable). Install the NI-DAQmx driver software. -
Page 6: Checking Device Temperature Changes
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. 6 | ni.com | NI 6738/6739 Calibration Procedure... -
Page 7: Verification
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>. Table 3, NI 6738/6739 Analog Output... - Page 8 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) 8 | ni.com | NI 6738/6739 Calibration Procedure...
- Page 9 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) NI 6738/6739 Calibration Procedure | © National Instruments | 9...
- Page 10 Test Point from DAQmxWriteAnalogF64 Table 3, NI 6738/6739 Analog Output Values. • taskHandle: taskHandle • numSampsPerChan: • autoStart: • timeout: 10.0 • dataLayout: DAQmx_Val_GroupByChannel • writeArray: &data 10 | ni.com | NI 6738/6739 Calibration Procedure...
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Page 11: Counter Verification
You have finished verifying the analog output levels on your device. Counter Verification NI 6738/6739 devices have only one timebase to verify, so only Counter 0 needs to be checked. It is not possible to adjust this timebase, so only verification can be performed. -
Page 12: Adjustment
NI. Adjustment The following procedure adjusts the analog output of your NI 6738/6739. At the end of each calibration procedure, these new constants are stored in the external calibration area of the EEPROM. These values are password-protected, which prevents the accidental access or modification of any calibration constants adjusted by the metrology laboratory. - Page 13 Use the DMM to read the value of AO 0. Call with the following parameter: DAQmxClearTask • taskHandle taskHandle Call with the following parameters: DAQmxInitExtCal • deviceName: Dev_name • password: • calHandle: &calHandle NI 6738/6739 Calibration Procedure | © National Instruments | 13...
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Page 14: Eeprom Update
10. Disconnect the DMM from the device. 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... -
Page 15: Test Limits
Test Limits The tables in this section list the specifications for PCIe/PXIe-6738 and PXIe-6739. The specifications are divided into analog output and counter/timer tables of values. Refer to the tables and specifications document for your device. Table 3. NI 6738/6739 Analog Output Values... -
Page 16: Worldwide Support And Services
NI product. Refer to the Export Compliance Information at ni.com/legal/export-compliance for the National Instruments global trade compliance policy and how to obtain relevant HTS codes, ECCNs, and other import/export data. NI MAKES NO EXPRESS OR IMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS.
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