National Instruments PXIe-7865 Manual

CALIBRATION PROCEDURE
NI PXIe-7865 and NI PXIe-7866
This document contains the verification and adjustment procedures for NI PXIe-7865/7866.
For more information about calibration solutions, visit ni.com/calibration.
Software
Calibrating the NI PXIe-7865/7866 requires installation of the correct software version on the
calibration system.
• LabVIEW 2019 SP1 or later
• NI R Series Multifunction RIO Device Drivers January 2020 or later
Documentation
Consult the following documents for information about your device, LabVIEW, and driver
software. All documents are available on ni.com/manuals and help files install with the
software.
NI PXIe-7865 Getting Started Guide
NI PXIe-7865 specific information
NI PXIe-7865 Specifications
NI PXIe-7865 specifications and calibration interval
NI PXIe-7865 User Manual
NI PXIe-7865 specific information
NI PXIe-7866 Getting Started Guide
NI PXIe-7866 specific information
NI PXIe-7866 Specifications
NI PXIe-7866 specifications and calibration interval

NI PXIe-7866User Manual
NI PXIe-7866 specific information
LabVIEW Help
LabVIEW programming concepts and reference information
NI-RIO Help
NI-RIO and Multifunction RIO Device Drivers reference information
Test Equipment
The following table 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.
Table 1. Recommended Equipment
Equipment Recommended Model Requirements
Calibrator Fluke 5700A Use a high-precision voltage source that is
10 ppm or less.
DMM NI 4070 Use a multiranging 6½-digit DMM with an
accuracy of 250 ppm.
Counter Agilent 53131A Use a counter accurate to 0.01%.
Low thermal
copper EMF plug-
in cables
Fluke 5440A-7002 Do not use standard banana cables.
Shielded MIO
cable
NI SHC68-68-RMIO Use this high-performance shielded cable,
designed specifically for R Series devices,
when calibrating the NI R Series device.
Accessory NI SCB-68A The SCB-68A is a shielded I/O connector
block with 68 screw terminals for easy
signal connection to the R Series devices.
NI CB-68LP, NI TBX-68,
NI CB-68LPR
The CB-68LP, CB-68LPR, and TBX-68 are
low-cost termination accessories with 68
screw terminals for easy signal connection
to the R Series devices.
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Test Conditions
The following setup and environmental conditions are required to ensure the device meets
published specifications.
• Keep connections to the device as short as possible. Long cables and wires act as
antennas, picking up extra noise that can affect measurements.
• Use shielded copper wire for all cable connections to the device. Use twisted-pairs wire
to eliminate noise and thermal offsets.
• Maintain an ambient temperature of 23 °C ± 5 °C. The device temperature will be greater
than the ambient temperature.
• Keep relative humidity below 80% .
• Allow a warm-up time of at least 15 minutes to ensure that the device measurement
circuitry is at a stable operating temperature.
Initial Setup
Refer to your getting started guide for your device for information about how to install the
software and hardware.
Note You can access all of the NI R Series VIs for calibration at <labview>
\vi.lib\LabVIEW Targets\FPGA\RIO\R Series\78XXR\783XR
\Calibration\Public.
Self-Calibration
Complete the following steps to self-calibrate the device.
Note No signal connections are needed for self-calibration.
1. Wait 15 minutes for the device to warm-up.
2. Launch the self-calibration VI nirio78xxCalibrationSelfCal.vi.
3. Call self-calibration before doing the first verification.
4. Pass a TRUE to Save Cal Results to save the constants to the user portion of the
flash memory. If you pass False, the constants are then discarded.
As-Found and As-Left Limits
The as-found (1-Year) limits are the published specifications for the NI PXIe-7865/7866. NI
uses these limits to determine whether the NI PXIe-7865/7866 meets the specifications when it
is received for calibration. Use the as-found limits during initial verification.
The as-left (24-Hour) calibration limits are equal to the published NI specifications for the NI
PXIe-7865/7866, less guard bands for measurement uncertainty, temperature drift, and drift
NI PXIe-7865 and NI PXIe-7866 Calibration Procedure | © National Instruments | 3

over time. NI uses these limits to reduce the probability that the instrument will be outside the
published specification limits at the end of the calibration cycle. Use the as-left limits when
performing verification after adjustment.
Verification
The following performance verification procedures describe the sequence of operation and
provide test points required to verify the NI PXIe-7865/7866. The verification procedures
assume that adequate traceable uncertainties are available for the calibration references.
Analog Input Accuracy Verification
Complete the following procedure to determine the As-Found status of the NI
PXIe-7865/7866.
1. Connect the NI R Series device to the calibrator as shown in the following figure.
Figure 1. Analog Input Verification Connections
Calibrator
HI
LO
AI1
–
+
AI0
–
+
2. If your calibrator has a guard connection, connect that terminal to AI GND.
3. Set the calibrator voltage to a Test Point value indicated in the appropriate Analog Input
Accuracy Verification Test Limits table in the Test Limits section of this document.
4. Measure the analog input voltage on each channel by calling
nirio78xxCalibrationReadAIVoltage.vi.
5. Compare the measured voltage with the 1-year limits from the appropriate Analog Input
Accuracy Verification Test Limits table to verify the input accuracy. If the value is within
these limits, the device passes the test.
6. Repeat steps 3 through 5 for each test point in the following Analog Input Accuracy
Verification Test Limits table.
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Table 2. Analog Input Accuracy Verification Test Limits
Range (V) Test Point 24-Hour Limits 1-Year Limits
Minimum Maximum Location
Value
(V)
Lower
Limit (V)
Upper
Limit (V)
Lower
Limit (V)
Upper
Limit (V)
-10 10
Positive
full-scale 10 9.998416 10.001584 9.997717 10.002283
0 0 -0.000639 0.000639 -0.000639 0.000639
Negative
full-scale -10 -10.001584 -9.998416 -10.002283 -9.997717
-5 5
Positive
full-scale 5 4.999180 5.000820 4.998830 5.001170
0 0 -0.000340 0.000340 -0.000340 0.000340
Negative
full-scale -5 -5.000820 -4.999180 -5.001170 -4.998830
-2 2
Positive
full-scale 2 1.999661 2.000339 1.999521 2.000479
0 0 -0.000137 0.000137 -0.000137 0.000137
Negative
full-scale -2 -2.000339 -1.999661 -2.0004790 -1.999521
-1 1
Positive
full-scale 1 0.999817 1.000183 0.999748 1.000252
0 0 -0.000074 0.000074 -0.000074 0.000074
Negative
full-scale -1 -1.000183 -0.999817 -1.000252 -0.999748
Analog Output Accuracy Verification
Complete the following procedure to determine the As-Found status of the NI
PXIe-7865/7866.
1. Connect the NI R Series device to the DMM as shown in the following figure.
NI PXIe-7865 and NI PXIe-7866 Calibration Procedure | © National Instruments | 5

Figure 2. Analog Output Verification Connections
DMMNI R Series
HI
AO0
LO
AOGND0
2. Set the DMM measurement range to 10 V.
3. Measure the analog output voltage on each channel by calling
nirio78xxCalibrationSetAOVoltage.vi.
4. Compare the resulting value shown by the DMM to the 1-year limits in the appropriate
Analog Output Accuracy Verification Test Limits table in the Test Limits section of this
document. If the value is within these limits, the device passes the test.
5. Repeat steps 3 through 4 for each test point in the following Analog Output Accuracy
Verification Test Limits table.
6. Disconnect the DMM from the NI R Series device.
7. Repeat steps 1 through 6 for all AO channels on the device.
Table 3. Analog Output Accuracy Verification Test Limits
Range (V) Test Point 24-Hour Limits 1-Year Limits
Minimum Maximum Location
Value
(V)
Lower
Limit (V)
Upper
Limit (V)
Lower
Limit (V)
Upper
Limit (V)
-10 10
Positive
full-scale 10 9.997852 10.002148 9.997502 10.002498
0 0.0 -0.001099 0.001099 -0.001099 0.001099
Negative
full-scale -10 -10.002148 -9.997852 -10.002498 -9.997502
Counter Verification
Complete the following procedure to determine the As-Found status of the NI
PXIe-7865/7866.
1. Connect the NI R Series device to the counter as shown in the following figure.
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Figure 3. Counter Verification Connections
NI PXIe-7865/7866
Counter
Connector1/DGND
Connector1/DIO0
–
+
Note The Agilent 53131A counter uses BNC connectors on its channels and
has no HI or LO inputs. Connections on the Agilent 53131A must be made
using BNC (50 Ω) to the patch cords or adapter.
2. Configure the counter to use time arming mode, with Gate Time set to 0.1 s.
3. Generate the counter output signal by calling
nirio78xxCalibrationStartCounter.vi.This VI causes the device to begin
outputting a square-wave on Connector1/DIO0 at 5 MHz.
4. Compare the value read by your counter to the test limits shown in the following
NI R Series Counter Verification Test Limits table. If the value is within these limits, the
device passes the test.
Table 4. NI R Series Counter Verification Test Limits
Set Point (MHz) Lower Limit (MHz) Upper Limit (MHz)
5.0 4.999500 5.000500
5. Stop the generation by calling nirio78xxCalibrationStopCounter.vi.
6. Disconnect the counter from your device.
Note If the Counter Verification procedure determines that the NI R Series 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 performance adjustment procedure describes the sequence of operation require
to adjust the NI PXIe-7865/7866.
Note
• If the NI PXIe-7865/7866 device successfully passed each of the verification
procedures within the 24-hour test limits, then an adjustment is not required.
• If the NI PXIe-7865/7866 device is not within the 1-year test limits, then
adjustment is recommended to guarantee the published specifications for the
next year.
NI PXIe-7865 and NI PXIe-7866 Calibration Procedure | © National Instruments | 7

• Following the adjustment procedure automatically updates the calibration date
and temperature in the external calibration area of the onboard flash memory of
the NI PXIe-7865/7866 device.
• If an adjustment is not required use the
nirio78xxCalibrationUpdateExtCalDate.vi to update the External
Calibration date.
Complete the following procedure to adjust the calibration constants performance of the NI
PXIe-7865/7866 device.
1. Set the calibrator to Standby mode (STBY).
2. Connect your device to the calibrator.
3. Initialize the external calibration process by calling
nirio78xxRCalibrationAdjustExtCal.vi. Set the Action to Initialize. This
action is password-protected and the default password is NI. You do not need to input
values for Comments or Current Calibrator Value.
4. Determine the value of the NI PXIe-7865/7866 device onboard reference by completing
the following steps.
a) Call nirio78xxCalibrationAdjustExtCal.vi. Set the Action to
CalibrateOnboardReference and pass the Current Calibrator Value of 0 V to
the VI for the first iteration. nirio78xxCalibrationAdjustExtCal.vi then
performs measurements and determines a new Requested Calibrator Value.
b) Program the calibrator to output the Requested Calibrator Value. At this point, you
must wait to ensure that the calibrator output has settled completely.
c) Repeat steps a and b until the Reference Calibration Done output becomes TRUE.
With each new iteration of these steps, input the Requested Calibrator Value returned
from the previous iteration.
5. Adjust the NI PXIe-7865/7866 device external calibration constants by calling
nirio78xxCalibrationAdjustExtCal.vi. Set the Action to
AdjustCalibration.
6. Save the calibration adjustment values to the onboard flash memory using
nirio78xxCalibrationAdjustExtCal.vi. Set the Action to CommitAndClose.
a) If you would prefer to cancel the calibration, you call this VI and set the Action to
CancelandClose. A comment input is provided for storing any comments related
to your calibration.
7. Disconnect the calibrator from the device.
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
have met the Test Conditions before returning your device to NI. Refer to the
Worldwide Support and Services section for assistance in returning the device to NI.
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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 resources to
email and phone assistance from NI Application Engineers.
Visit ni.com/services for information about the services NI offers.
Visit ni.com/register to register your NI product. Product registration facilitates technical
support and ensures that you receive important information updates from NI.
NI corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas,
78759-3504, USA. For up-to-date contact information for your location, visit ni.com/contact.
NI PXIe-7865 and NI PXIe-7866 Calibration Procedure | © National Instruments | 9

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378236A-01 April 9, 2020