CALIBRATION PROCEDURE
NI PXIe-4300 Array
This document contains information about verifying and adjusting National Instruments NI PXIe-4300 modules using NI-DAQmx 9.1 and later. For more information about calibration, /
calibration.
Contents
Software (1)2020久久
Documentation (1)
Calibration Interval (2)
Test Equipment (2)
Test Conditions (2)
Verification and Adjustment Procedure (3)
Initial Setup (3)
Self-Calibration (3)
Checking Device Temperature Changes (4)
Verification Procedure (4)
Adjustment Procedure (7)
Where to Go for Support (8)
Software
Verification and adjustment requires NI-DAQmx 9.1 or later. You can download NI-DAQmx 9.1 /downloads. NI-DAQmx supports a number of programming languages, including
LabVIEW, LabWindows TM/CVI TM, C/C++, C#, and Visual Basic . When you install NI-DAQmx, you only need to install support for the ADE that you intend to u.
Documentation
The following documents are your primary references for writing verification and adjustment
procedures with NI-DAQmx. You can download the latest version of the documents from the NI Web site /manuals.
•The NI SC Express 4300 Installation Guide and Terminal Block Specifications provides instructions for installing and configuring the NI PXIe-4300 module and TB-4300 and includes
terminal block specifications.
•The NI PXIe-4300 Ur Manual describes how to u the NI PXIe-4300.
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•The NI PXIe-4300 Specifications lists the specifications for the NI PXIe-4300.
•The NI-DAQmx Help includes information about creating applications that u the NI-DAQmx driver.
•The NI-DAQmx C Reference Help includes information about the functions in the driver.
杜甫的一生概括NI PXIe-4300 Calibration
Calibration Interval
National Instruments recommends a calibration interval of one year for the NI PXIe-4300. Adjust and verify at the recommended interval bad on the measurement accuracy demands of your application.
Test Equipment
National Instruments recommends that you u the instruments in Table 1 for adjusting and verifying an NI PXIe-4300 module.
Test Conditions
The following tup and environmental conditions are required to ensure the NI Device meets published specifications.•Keep connections to the device as short as possible. Long cables and wires can act as antennae, which can pick up extra noi that affects measurements.
•U shielded copper wire for all cable connections to the device. U twisted-pair wire to eliminate noi and thermal offts.
•Maintain the ambient temperature between 18°C and 28°C.
•
For valid test limits, maintain the device temperature within ±1°C from the last lf-calibration and ±10°C from the last external calibration. The device temperature will be greater than the ambient temperature. Refer to the Verification and Adjustment Procedure ction for more information about verification and adjustment temperatures and temperature drift.•Keep relative humidity below 80%.
•Allow at least 15 minutes warm-up time to ensure that the measurement circuitry is at a stable operating temperature.
•
Ensure that the PXI Express chassis fan speed is t to HIGH, that the fan filters are clean, and that the empty slots contain filler panels. For more information, refer to the Maintain Forced-Air Cooling Note to Urs document available /manuals .
Table 1. Recommended Equipment
Equipment Recommended Model Requirements
Calibrator
Fluke 5700A
If this instrument is unavailable, u a high-precision voltage source with an accuracy of at least 10ppm for adjustment and at least 40ppm for verification. The source needs an output impedance of less than or equal to 50Ω.PXI Express Chassis NI PXIe-1062Q —
Connection Accessory
TB-4300
Screw terminal accessory (10V) for the NI PXIe-4300.
© National Instruments Corporation 3NI PXIe-4300 Calibration Procedure
丝路起点Verification and Adjustment Procedure
The verification and adjustment process has six steps.1.Initial Setup —Configure your device in NI-DAQmx.
2.Self-Calibration —Adjust the lf-calibration constants of the device.
3.Checking Device Temperature Changes —Determine that the current device temperature will not cau you to incorrectly verify and adjust your device.
4.Verification Procedure —Verify the existing operation of the device. This step allows you to confirm that the device was operating within its specified range prior to adjustment.
5.Adjustment Procedure —Perform an external calibration that adjusts the device calibration constants with respect to a known voltage source.
6.
Reverification —Perform another verification to ensure that the device is operating within its specifications after adjustment.
The steps are described in detail in the following ctions. Although NI recommends that you verify all ranges, you can save time by checking only the ranges ud in your application.
Initial Setup
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The device must be configured in Measurement & Automation Explorer (MAX) to communicate with NI-DAQmx. Complete the following steps to configure a device in MAX.1.
Install the NI-DAQmx driver software.
Caution
Always have the PXI Express chassis turned off when inrting a module.
2.Inrt the module into an available slot in the PXI Express chassis.
3.Launch MAX.
4.Select My System»Devices and Interfaces»Chassis 1.
5.
Right-click NI PXIe-4300 and lect Self-Test to ensure that the module is working properly.
Note
When a device is configured with MAX, it is assigned a device identifier. Each function call us this identifier to determine which DAQ device to verify or, verify and adjust.
周黑鸭的做法Self-Calibration
Perform lf-calibration after the device has warmed up for the recommended time period of 15 minutes. Call lf-calibration before doing the first verification. This function measures the onboard reference voltage of the device and adjusts the lf-calibration constants to account for any errors caud by short-term fluctuations in the environment.
You can initiate lf-calibration using MAX, by completing the following steps.1.Launch MAX.
肚脐眼的作用2.Select My System»Devices and Interfaces»Chassis 1»NI PXIe-4300.
3.
Initiate lf-calibration using one of the following methods:•Click Self-Calibrate in the upper right corner of MAX.
•
Right-click NI PXIe-4300 and lect Self-Calibrate from the drop-down menu.
Note
NI recommends lf-calibrating using MAX, although you can also lf-calibrate
programmatically.
NI PXIe-4300 Calibration
Checking Device Temperature Changes
Device temperature changes (greater than ±10°C since the previous external calibration or greater than ±1°C since the previous lf-calibration) can cau you to incorrectly verify and adjust your device. After lf-calibrating your device as described in the Self-Calibration ction, complete the following steps to compare the current device temperature to the temperatures measured during the last lf-calibration and external calibration in MAX.
Note
The maximum temperature change for most DAQ devices is ±10°C. To find the valid temperature drifts for your NI PXIe-4300 module, refer to the AI Absolute Accuracy Table in the NI PXIe-4300 Specifications .
1.Launch MAX.
2.Select My System»Devices and Interfaces»Chassis 1»NI PXIe-4300.
3.Click the Calibration tab.
If the device temperature is outside the maximum range, choo one of the following options:
•Recalculate the test limits to include the additional error due to temperature drift. Refer to the NI PXIe-4300 Specifications for more information.
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Change the system so that the temperature will be clor to the temperature recorded during the last external calibration.
Verification Procedure
This ction provides instructions for verifying the NI PXIe-4300 specifications.
Throughout the verification process, u Table 3 to determine if your device needs to be adjusted.Note
Limits in the Table 3 are bad upon the February 2010 edition of the NI PXIe-4300
Specifications . Refer to the most recent NI PXIe-4300 Specifications online /manuals. If a more recent edition of the specifications is available, recalculate the limits bad upon the latest specifications.
Since NI PXIe-4300 modules have many different ranges, you must check measurements for each available range. You must perform verification on all ranges of all analog input channels of NI PXIe-4300 modules in differential mode.
Note
The test limits ud 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 lf-calibration. Refer to the Checking Device Temperature Changes ction for more information and instructions on readin
g your device temperature and comparing it against the device temperature during the last
external calibration.
© National Instruments Corporation 5NI PXIe-4300 Calibration Procedure
Complete the following steps to verify the analog input:
Note
The TB-4300B cannot be ud for verification or adjustment of the NI PXIe-4300.
1.Connect the output of the calibrator to the TB-4300 as shown in Figure 1.
2.Connect the TB-4300 to the NI PXIe-4300.
3.If your calibrator has a guard connection, leave it disconnected.
4.
If your calibrator output is truly floating, you must connect the negative output to a quiet earth ground as well as COM to give the entire system a ground reference.
For more information, refer to the NI PXIe-4300 Ur Manual .
Figure 1. TB-4300 to Calibrator Wiring Diagram
Table 3 shows all acceptable values for the NI PXIe-4300. NI recommends that you verify all ranges, although you may want to save time by checking only the ranges ud in your application.5.
Set the calibrator voltage to the test value indicated in Table 3.
1TB-4300 Terminal Block 2To Calibrator +3
To Calibrator –
