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NI 6738/6739 Calibration Procedure

Call

DAQmx

SeriesCalAdjust

with the following parameters:

•

calHandle

calHandle

•

referenceVoltage

: Value read from DMM

Call

DAQmxCloseExtCal

with the following parameters:

•

calHandle

calHandle

•

action

DAQmx_Val_Action_Commit

This function also saves the date, time, and temperature of the adjustment to the onboard
memory.

Note

If an error occurs during adjustment, no constants are written to the

EEPROM.

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
any adjustments by initializing an external calibration (using the

DAQmxInitExtCal

function

call) and closing the external calibration (using the

DAQmxCloseExtCal

function call).

Reverification

Repeat the

Verification

section to determine the as-left status of the device.

Note

If any test fails reverification after performing an adjustment, verify that you

successfully self-calibrated the device, as described in the

Self-Calibration

section,

before returning your device to NI. Refer to

Worldwide Support and Services

for

assistance in returning the device to NI.

Содержание 6738

Страница 1: ...ure 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 ...

Страница 2: ...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 referen...

Страница 3: ...equirements DMM NI 4070 AnalogOutput 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 ...

Страница 4: ...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 ...

Страница 5: ...rs 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 devi...

Страница 6: ... 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 c...

Страница 7: ...n 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 perfor...

Страница 8: ...in 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 ...

Страница 9: ...r 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 2...

Страница 10: ...QmxWriteAnalogF64 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 ...

Страница 11: ... so only Counter 0 needs to be checked It is not possible to adjust this timebase so only verification can be performed Note Table 4 NI 6738 6739 Counter 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 Caution Do not perform analog output verification and counter verification simul...

Страница 12: ...ollowing parameter taskHandle taskHandle 10 Call DAQmxClearTask with the following parameter taskHandle taskHandle 11 Disconnect the external counter from your device Note If the counter verification procedure determines that the device is outside of the limits refer to the Worldwide Support and Services section for assistance in returning the device to NI Adjustment The following procedure adjust...

Страница 13: ...refer to the NI DAQmx function call parameters for the LabVIEW input values 3 Call DAQmxStartTask with the following parameter using Table 3 NI 6738 6739 Analog Output Values taskHandle taskHandle 4 Call DAQmxWriteAnalogF64 with the following parameters using 7 5 for data taskHandle taskHandle numSampsPerChan 1 autoStart 1 timeout 10 0 dataLayout DAQmx_Val_GroupByChannel writeArray data sampsPerCh...

Страница 14: ...leted 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 by initializing an external calibration using the DAQmxInitExtCal function call and closing the external calibration using the DAQmxCloseExtCal function call Reverification Repeat the Verification section to ...

Страница 15: ... document for your device Table 3 NI 6738 6739 Analog Output Values Range V Test Point 24 Hour Limits 2 Year Limits Minimum Maximum Location Value V Lower Limit V Upper Limit V Lower Limit V Upper Limit V 10 10 Pos FS 9 980000 9 977392 9 982608 9 977063 9 982937 10 10 0 000000 0 000000 0 001630 0 001630 0 001630 0 001630 10 10 Neg FS 9 980000 9 982608 9 977392 9 982937 9 977063 Table 4 NI 6738 673...

Страница 16: ...ained in this manual was developed at private expense and is subject to the applicable limited rights and restricted data rights as set forth in FAR 52 227 14 DFAR 252 227 7014 and DFAR 252 227 7015 Worldwide Support and Services The NI website is your complete resource for technical support At ni com support you have access to everything from troubleshooting and application development self help ...

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