National Instruments NI PXIe-4464 Manual

CALIBRATION PROCEDURE
NI PXIe-4464
4-Channel, 204.8 kS/s DSA Input
This document contains the verification and adjustment procedures for the National Instruments
PXIe-4464. The NI PXIe-4464 is available in two input connector variants: BNC and mXLR.
The calibration procedure is common between them; only the connecting cabling is different. In
this document, the BNC and mXLR variants are referred to inclusively as the NI PXIe-4464. For
more information about calibration solutions, visit ni.com/calibration.
Contents
Software.................................................................................................................................... 1
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 2
Test Conditions......................................................................................................................... 5
Initial Setup............................................................................................................................... 5
Verification ............................................................................................................................... 6
Adjustment................................................................................................................................ 16
Reverification ........................................................................................................................... 18
Updating the Calibration Date without Performing Adjustment.............................................. 18
Specifications............................................................................................................................ 19
Where to Go for Support .......................................................................................................... 19
Software
Calibrating the NI PXIe-4464 requires the installation of NI-DAQmx on the calibration system.
NI-DAQmx 14.1 added driver support for the NI PXIe-4464. For the list of devices supported
by a specific release, refer to the NI-DAQmx Readme, available on the version-specific
download page or installation media.
You can download NI-DAQmx from ni.com/downloads. NI-DAQmx supports LabVIEW,
LabWindows™/CVI™, C/C++, C#, and Visual Basic .NET. When you install NI-DAQmx, you
only need to install support for the application software that you intend to use.

2|ni.com |NI PXIe-4464 Calibration Procedure
Documentation
Consult the following documents for information about the NI PXIe-4464, NI-DAQmx, and
your application software. All documents are available on ni.com and help files install with the
software.
Test Equipment
Table 1 lists the equipment recommended for the performance verification and adjustment
procedures. The test instrumentation requirements are the same for each input connector variant.
If the recommended equipment is not available, select a substitute using the minimum
requirements listed in the table.
NI PXIe-4464 Getting Started Guide
NI-DAQmx driver software installation and hardware setup
NI PXIe-4464 Specifications
NI PXIe-4464 specifications and 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 PXIe-4464 Calibration Procedure |© National Instruments |3
Table 1. Recommended Equipment
Equipment
Recommended
Model(s) Where Used
Minimum
Requirements
Calibrator Fluke 5700A AI Gain Frequency Range:
40 Hz to 92.2 kHz
Voltage Range:
up to 6.3 Vrms
ACV Accuracy:
40 Hz: 0.017%
1 kHz: 0.016%
20 kHz: 0.017%
45 kHz: 0.087%
92.2 kHz: 0.29%
Function Generator Keysight (Agilent)
33250A series
Timebase
Frequency
Frequency Range:
up to 90 kHz
Frequency Accuracy:
2ppm
Voltage Range:
up to 9 Vpk
Digital Multimeter NI PXI-4070 IEPE Current Current Accuracy: 0.9%
BNC Shorting Cap
(quantity 4)
Pomona Electronics
5085
or Pomona
Electronics 3840-50
AI Offset Resistance: ≤50 Ω
BNC F-F-F T-Connector
(quantity 3)
Pomona Electronics
3284
AI Gain Characteristic
Impedance: 50 Ω
BNC (F) to Banana Adapter
(quantity 1)
Pomona Electronics
1269
AI Gain —
BNC (M) Cable
(BNC variant: quantity 7
mXLR variant: quantity 3)
Pomona Electronics
5697
AI Gain Characteristic
Impedance: 50 Ω
mXLR (F) to BNC (M) Cable*
(quantity 4)
NI 156789-XX or
NI 140150-XX
0R460.46 m
0R910.91 m
2R42.4 m
All —
BNC F-F Adapter*
(quantity 4)
Pomona Electronics
3283
AI Offset —
*Required only for the mXLR variant.

4|ni.com |NI PXIe-4464 Calibration Procedure
Connecting the NI PXIe-4464
The NI PXIe-4464 provides connections for four channels. Figure 1 shows the front panel
connections of the NI PXIe-4464 with BNC connectors and the NI PXIe-4464 with mXLR
connectors.
Figure 1. NI PXIe-4464 BNC and mXLR Connector Front Panel
1 Top Module Mounting Screw
2PFI
3 Chassis Ground
4AI+
5AI-
6 Bottom Module Mounting Screw
NI PXIe-4464
DSA Analog Input
AI 0
AI 1
AI 2
AI 3
PFI 0
NI PXIe-4464
DSA Analog Input
AI 0
PFI 0
AI 1
AI 2
AI 3
2 2
1 1
6 6
43
4
5
3
3
3
5

NI PXIe-4464 Calibration Procedure |© National Instruments |5
Test Conditions
The following setup and environmental conditions are required to ensure the NI PXIe-4464
meets published specifications.
• Keep connections to the NI PXIe-4464 as short as possible. Long cables and wires act as
antennas, picking up extra noise that can affect measurements.
• Verify that all connections to the device are secure.
• 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 NI PXIe-4464 measurement
circuitry is at a stable operating temperature.
• Allow adequate warm-up time for all of the instruments and equipment according to the
manufacturer instructions.
Initial Setup
Refer to the DAQ Getting Started Guide and the NI PXIe-4464 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.
Self-Calibration
The NI PXIe-4464 includes precise internal circuits and references used during self-calibration
to adjust for any errors caused by short-term fluctuations in the environment.
Note Conduct a self-calibration before completing the first verification (that is,
verification that does not immediately follow adjustment).
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 MAX.
3. Select My System»Devices and Interfaces»your device.
4. Initiate self-calibration using one of the following methods:
•ClickSelf-Calibrate in the upper right corner of the window.
• Right-click the device name under Devices and Interfaces, and select Self-Calibrate
from the drop-down menu.

6|ni.com |NI PXIe-4464 Calibration Procedure
Verification
The following performance verification procedures describe the sequence of operation and
provide test points required to verify the NI PXIe-4464. The verification procedures assume that
adequate traceable uncertainties are available for the calibration references.
Note Conduct a self-calibration before completing the first verification (that is,
verification that does not immediately follow adjustment). Refer to the
Self-Calibration section for instructions on performing a self-calibration.
Note Test limits in Tables 2 through 15 are based upon the July 2014 edition of the
NI PXIe-4464 Specifications. Refer to the most recent NI PXIe-4464 Specifications
at ni.com/manuals.
Analog Input Performance Verification
This section verifies the analog input (AI) performance of the NI PXIe-4464. Some, but not all,
performance characteristics are affected by adjustment and are subject to reverification after adjustment.
Characteristics affected by adjustment have As Left test limits in addition to As Found test limits.
Characteristics unaffected by adjustment solely have test limits with no additional qualification.
AI Offset Accuracy Verification
Complete the following steps to verify the AI offset accuracy:
1. Using the equipment described in Table 1, connect a BNC shorting cap to each device input
channel.
2. Create and configure an AI voltage task on the device as shown in Table 2.
Table 2. AI Offset Verification Configuration
Configuration Value
Physical channels Dev_name/ai0:3
Gain*-20 (dB)
Coupling DC
Terminal configuration Pseudodifferential
Excitation (IEPE) 0 (A)
Acquisition mode Finite number of samples
Rate 204800.0
Samples per channel 102400
* As you configure the AI voltage task, refer to Table 3 for the maximum and minimum voltages to
specify when creating the task to ensure the specified gain range is used on the module. The module
automatically selects the gain range based on the maximum and minimum voltages you supply when you
create the task.

NI PXIe-4464 Calibration Procedure |© National Instruments |7
3. Start the task.
4. Acquire readings with the NI PXIe-4464.
5. On a per channel basis, average all of the acquired samples.
6. Stop and clear the task.
7. Compare the averaged values to the appropriate limits in Table 4. The average is the offset
at the -20 dB gain setting.
8. Repeat steps 2 through 7 for each gain setting of the device. When performing step 2, set
the gain1parameter to -10, 0, 10, 20, and 30 as required.
Table 3. Gain Range and Corresponding Max and Min Voltages
Desired Gain Range (dB) Max Voltage (V) Min Voltage (V)
-20 42.4 -42.4
-10 31.6 -31.6
010.0 -10.0
10 3.16 -3.16
20 1.00 -1.00
30 0.316 -0.316
Table 4. AI Offset Accuracy Limits
Device Gain
(dB)
As Found Test Limit As Left Test Limit
Min (mV) Max (mV) Min (mV) Max (mV)
-20 -9.0 9.0 -2.2 2.2
-10 -3.0 3.0 -0.75 0.75
0-0.9 0.9 -0.25 0.25
10 -0.3 0.3 -0.1 0.1
20 -0.15 0.15 -0.05 0.05
30 -0.1 0.1 -0.05 0.05
1 Refer to Table 3 for the maximum and minimum voltages to specify to ensure the specified gain range is
used on the module.

8|ni.com |NI PXIe-4464 Calibration Procedure
AI Gain Accuracy Verification
Complete the following steps to verify the AI gain accuracy:
1. Using the equipment described in Table 1, connect the output of the calibrator to the analog
input channel 0 of the device.
2. Configure the calibrator to generate an output with the amplitude and frequency listed in
the -20 dB gain row of Table 5.
3. Create and configure an AI voltage task on the device as shown in Table 6.
Table 5. AI Gain Accuracy Limits
Device
Gain
(dB)
Calibrator Output
As Found Test
Limit As Left Test Limit
Amplitude
(Vrms)
Frequency
(Hz)
Min
(Vrms)
Max
(Vrms)
Min
(Vrms)
Max
(Vrms)
-20 6.3 1000 6.27828 6.32180 6.29606 6.30394
-10 6.3 1000 6.27828 6.32180 6.29606 6.30394
06.3 1000 6.27828 6.32180 6.29606 6.30394
10 2.0 1000 1.99310 2.00692 1.99875 2.00125
20 0.63 1000 0.62783 0.63218 0.62961 0.63039
30 0.2 1000 0.19931 0.20069 0.19988 0.20013
Table 6. AI Gain Verification Configuration
Configuration Value
Physical channel Dev_name/ai0
Gain*-20 (dB)
Coupling AC
Terminal configuration Pseudodifferential
Excitation (IEPE) 0 (A)
Acquisition mode Finite number of samples
Rate 204800.0
Samples per channel 102400
*Refer to Table 3 for the maximum and minimum voltages to specify to ensure the specified gain range
is used on the module.

NI PXIe-4464 Calibration Procedure |© National Instruments |9
4. If the coupling changes from DC to AC (for example, on the first gain verification point
tested), commit the configuration using the DAQmx Control Task VI and wait 5 seconds
for the input to settle. Subsequent gain verification points, which do not change the
coupling, do not require a delay.
5. Start the task.
6. Acquire readings with the NI PXIe-4464.
7. Calculate the RMS amplitude of the acquired fundamental harmonic. Compare this
amplitude to the appropriate voltage limits in Table 5. The calculated amplitude is used to
verify the gain accuracy of analog input channel 0 at the -20 dB gain setting.
As an example, you can use the Extract Single Tone Information VI to help calculate RMS.
Note that the output of this VI is peak amplitude, and you must divide the result by √2 to
convert to RMS.
8. Stop and clear the task.
9. Repeat steps 2 through 8 for each gain setting of the device. When performing step 2,
configure the calibrator output to the amplitude and frequency indicated for the gain range
to be verified. When performing step 3, set the gain1parameter to -10, 0, 10, 20, and 30 as
required.
10. Repeat steps 1 through 9 for all input channels of the device. In step 1, connect the output
of the calibrator to the channel being verified. In step 3, replace ai0 in the physical
channel parameter with the channel being verified.
AI Gain Flatness Verification
Note This performance characteristic is not affected by adjustment. Consequently,
reverification after adjustment is not necessary.
Note DC-coupled gain flatness is inherently better than AC-coupled gain flatness,
specifically at low frequencies. Consequently, the verification of AC-coupled gain
flatness covers both configurations.
1 Refer to Table 3 for the maximum and minimum voltages to specify to ensure the specified gain range is
used on the module.

10 |ni.com |NI PXIe-4464 Calibration Procedure
Complete the following steps to verify the AI gain flatness:
1. Using the equipment described in Table 1, connect the output of the calibrator to the analog
input channel 0 of the device.
2. Configure the calibrator to generate an output with the amplitude and frequency listed in
the -20 dB gain row of Table 7.
3. Create and configure an AI voltage task on the device as shown in Table 8.
4. Start the task.
5. Acquire readings with the NI PXIe-4464.
Table 7. AI Gain Flatness Inputs
Device Gain (dB)
Calibrator Output
Amplitude (Vrms)Frequency (Hz)
-20 6.3 1000
-10 6.3 1000
06.3 1000
10 2.0 1000
20 0.63 1000
30 0.2 1000
Table 8. AI Gain Flatness Verification Configuration
Configuration Value
Physical channel Dev_name/ai0
Gain*-20 (dB)
Coupling AC
Terminal configuration Pseudodifferential
Excitation (IEPE) 0 (A)
Acquisition mode Finite number of samples
Rate 204800.0
Samples per channel 102400
* Refer to Table 3 for the maximum and minimum voltages to specify to ensure the specified gain range
is used on the module.

NI PXIe-4464 Calibration Procedure |© National Instruments |11
6. Calculate the RMS amplitude of the acquired fundamental harmonic. The measured
amplitude represents V1kHz referenced in Table 9.
As an example, you can use the Extract Single Tone Information VI to help calculate RMS.
Note that the output of this VI is peak amplitude, and you must divide the result by √2 to
convert to RMS.
7. Stop and clear the task.
8. Repeat steps 2 through 7 for each row in Table 9. When performing step 2, instead of
1 kHz, configure the calibrator output to the frequency listed in Table 9. The calibrator
output amplitude remains constant. Compare this amplitude to the appropriate limits in
Table 9.
Note The value of V1kHz is the measured amplitude of the 1 kHz tone, not the
nominal amplitude listed in Table 7.
9. Repeat steps 2 through 8 for each gain setting of the device. When performing step 2,
configure the calibrator output to the amplitude and frequency indicated for the gain range
to be verified. When performing step 3, set the gain1parameter to -10, 0, 10, 20, and 30 as
required.
10. Repeat steps 1 through 9 for all input channels of the device. In step 1, connect the output
of the calibrator to the channel being verified. In step 3, replace ai0 in the physical
channel parameter with the channel being verified.
1 Refer to Table 3 for the maximum and minimum voltages to specify to ensure the specified gain range is
used on the module.
Table 9. AI Flatness Limits
Calibrator Output
Frequency (Hz)
Test Limit
(-10 dB, -20 dB ranges)
Test Limit
(0 dB, 10 dB, 20 dB, 30 dB
ranges)
Min Max Min Max
40 0.97724 * V1kHz 1.02329 * V1kHz 0.99931 * V1kHz 1.00069 * V1kHz
20000 0.97724 * V1kHz 1.02329 * V1kHz 0.99931 * V1kHz 1.00069 * V1kHz
45000 0.93325 * V1kHz 1.07152 * V1kHz 0.99655 * V1kHz 1.00346 * V1kHz
92200 0.89125 * V1kHz 1.12202 * V1kHz 0.98855 * V1kHz 1.01158 * V1kHz

12 |ni.com |NI PXIe-4464 Calibration Procedure
AI Noise Verification
Note This performance characteristic is not affected by adjustment. Consequently,
reverification after adjustment is not necessary.
Complete the following steps to verify the AI noise:
1. Using the equipment described in Table 1, connect a BNC shorting cap to each device input
channel.
2. Create and configure an AI voltage task on the device as shown in Table 10.
3. Start the task.
4. Acquire readings with the NI PXIe-4464.
5. On a per channel basis, compute the standard deviation of the acquired samples.
6. Stop and clear the task.
7. Compare the computed values to the appropriate limits in Table 11. The standard deviation
is the input noise at the -20 dB gain setting at the 204.8 kS/s sample rate.
Table 10. AI Noise Verification Configuration
Configuration Value
Physical channels Dev_name/ai0:3
Gain*-20 (dB)
Coupling DC
Terminal configuration Pseudodifferential
Excitation (IEPE) 0 (A)
Acquisition mode Finite number of samples
Rate 204800.0
Samples per channel 102400
* Refer to Table 3 for the maximum and minimum voltages to specify to ensure the specified gain range
is used on the module.
Table 11. AI Noise Limits
Device Gain (dB)
fs= 51.2 kS/s
Max (µVrms)
fs= 204.8 kS/s
Max (µVrms)
-20 197 445
-10 117 243
014.0 32.9

NI PXIe-4464 Calibration Procedure |© National Instruments |13
8. Repeat steps 2 through 7 for the 51.2 kS/s sample rate. When performing step 2, set the rate
parameter to 51200 and the samples per channel parameter to 25600.
9. Repeat steps 2 through 8 for each gain setting of the device. When performing step 2, set
the gain1parameter to -10, 0, 10, 20, and 30 as required.
IEPE Current Verification
Note This performance characteristic is not affected by adjustment. Consequently,
reverification after adjustment is not necessary.
Complete the following steps to verify the IEPE current:
1. Set the digital multimeter to the AMPS function and a range suitable to measure currents
between 4 mA and 20 mA.
2. Using the equipment described in Table 1, connect the AMPS input of the digital
multimeter to the analog input channel 0 of the device.
3. Create and configure an AI voltage task on the device as shown in Table 12.
10 4.7 10.8
20 2.0 4.3
30 1.4 2.8
1 Refer to Table 3 for the maximum and minimum voltages to specify to ensure the specified gain range is
used on the module.
Table 12. IEPE Current Verification Configuration
Configuration Value
Physical channel Dev_name/ai0
Gain*-20 (dB)
Coupling AC
Terminal configuration Pseudodifferential
Excitation (IEPE) 0.004 (A)
Acquisition mode Finite number of samples
Rate 204800.0
Samples per channel 10240
*Refer to Table 3 for the maximum and minimum voltages to specify to ensure the specified gain range
is used on the module
Table 11. AI Noise Limits (Continued)
Device Gain (dB)
fs= 51.2 kS/s
Max (µVrms)
fs= 204.8 kS/s
Max (µVrms)

14 |ni.com |NI PXIe-4464 Calibration Procedure
4. Start the task.
5. Acquire readings with the NI PXIe-4464. The readings are not used; the task is simply run
to set the device configuration.
6. Measure the output current on the digital multimeter.
7. Stop and clear the task.
8. Compare this value to the appropriate limit in Table 13.
9. Repeat steps 3 through 8 for each IEPE current setting of the device. When performing
step 3, set the excitation parameter to 0.010 and 0.020 as required.
10. After the last IEPE current verification step, turn off the current by performing steps 3
through 7 with the excitation parameter in step 3 set to 0.
11. Repeat steps 2 through 10 for all input channels of the device. In step 2, connect the AMPS
input of the digital multimeter to the channel being verified. In step 3, replace ai0 in the
physical channel parameter with the channel being verified.
Timebase Frequency Accuracy Verification
Note All analog inputs on a single device use the same timebase circuitry.
Therefore, the measurements made on one channel are valid for all channels.
Complete the following steps to verify the timebase frequency accuracy:
1. Using the equipment described in Table 1, connect the output of the function generator to
the analog input channel 0 of the device. Connect a BNC shorting cap to the other device
input channels.
2. Configure the function generator to output a sine wave of 6.3 Vrms (8.9 Vpk) signal, no
offset, at a frequency of 10.000 kHz.
Table 13. IEPE Current Limits
IEPE Current Setting (mA)
Test Limit
Min (mA) Max (mA)
44.0 4.3
10 9.6 10.4
20 19.3 20.7

NI PXIe-4464 Calibration Procedure |© National Instruments |15
3. Create and configure an AI voltage task on the device as shown in Table 14.
4. Start the task.
5. Acquire readings with the NI PXIe-4464.
6. Measure the frequency of the acquired signal around 10 kHz. Compare the measured
frequency to the limits in Table 15.
7. Stop and clear the task.
Table 14. Timebase Frequency Verification Configuration
Configuration Value
Physical channel Dev_name/ai0
Gain*0 (dB)
Coupling AC
Terminal configuration Pseudodifferential
Excitation (IEPE) 0 (A)
Acquisition mode Finite number of samples
Rate 40000.0
Samples per channel 2560000
*Refer to Table 3 for the maximum and minimum voltages to specify to ensure the specified gain range
is used on the module.
Table 15. Timebase Frequency Accuracy Limits
Function Generator
Output As Found Test Limit As Left Test Limit
Amplitude
(Vrms)
Frequency
(kHz)
Min
(kHz)
Max
(kHz)
Min
(kHz)
Max
(kHz)
6.3 10.000 9.99973 10.00027 9.99992 10.00008

16 |ni.com |NI PXIe-4464 Calibration Procedure
Adjustment
If the NI PXIe-4464 successfully passed each of the verification procedures within the As Left
test limits without adjustment, then an adjustment is recommended, but not required, to warrant
the published specifications for the next calibration interval. If the device was not within the As
Left test limits, you can perform the adjustment procedure to improve the device accuracy and
reset the calibration interval.
In order to update the calibration date without performing adjustment, see the instructions in the
Updating the Calibration Date without Performing Adjustment section.
The external calibration interval is listed in the NI PXIe-4464 Specifications. An adjustment is
required at least once within this interval. Performing the adjustment procedure automatically
updates the calibration constants, date, and temperature in the device EEPROM.
The following performance adjustment procedures describe the sequence of operation required
to adjust the NI PXIe-4464.
Initialization
1. Call DAQmxInitExtCal (DAQmx Initialize External Calibration VI) to initialize the
calibration, using the following parameters:
deviceName: Dev_name
password: NI
calHandle: &myCalHandle
Offset Adjustment
2. Using the equipment described in Table 1, connect a BNC shorting cap to each device input
channel.
3. Call DAQmxAdjustDSAAICalWithGainAndCoupling (DAQmx Adjust DSA AI
Calibration with Gain and Coupling VI from the DAQmx Adjust DSA AI Calibration
Polymorphic VI), using the following parameters:
calHandle: myCalHandle
coupling: DAQmx_Val_DC
gain: 0
referenceVoltage: 0.0
Note Set the gainparameter to the value of the device gain setting being calibrated,
where 0, for example, represents 0 dB.
4. Repeat step 3 for each of the remaining gain ranges, sequentially substituting the gain
parameter with 10, 20, 30, -10, and -20.
Note All ranges must be adjusted for offset for the calibration to be valid.

NI PXIe-4464 Calibration Procedure |© National Instruments |17
Gain Adjustment
5. Using the equipment described in Table 1, connect the output of the calibrator to all of the
device input channels in parallel.
6. Configure the calibrator to output a 6.3 Vrms signal at 1 kHz.
7. Call DAQmxAdjustDSAAICalWithGainAndCoupling (DAQmx Adjust DSA AI
Calibration With Gain and Coupling VI from the DAQmx Adjust DSA AI Calibration
Polymorphic VI), using the following parameters:
calHandle: myCalHandle
coupling: DAQmx_Val_AC
gain: -20
referenceVoltage: 6.3
Note Set the gainparameter to the value of the device gain setting being calibrated,
where -20, for example, represents -20 dB.
8. Repeat step 7 for the -10 dB and 0 dB gain ranges, sequentially substituting the gain
parameter with -10 and 0.
9. Configure the calibrator to output a 2.0 Vrms signal at 1 kHz.
10. Repeat step 7 for the 10 dB gain range, substituting the gain parameter with 10 and the
referenceVoltage parameter with 2.0.
11. Configure the calibrator to output a 630 mVrms signal at 1 kHz.
12. Repeat step 7 for the 20 dB gain range, substituting the gain parameter with 20 and the
referenceVoltage parameter with 0.63.
13. Configure the calibrator to output a 200 mVrms signal at 1 kHz.
14. Repeat step 7 for the 30 dB gain range, substituting the gain parameter with 30 and the
referenceVoltage parameter with 0.2.
Note All ranges must be adjusted for gain for the calibration to be valid.
Timebase Adjustment
15. Using the equipment described in Table 1, connect the output of the function generator to
the analog input channel 0 of the device. Connect a BNC shorting cap to the other device
input channels.
16. Configure the function generator to output a sine wave of 6.3 Vrms (8.9 Vpk) signal, no
offset, at a frequency of 90.000 kHz.
17. Call DAQmxAdjustDSATimebaseCal (DAQmx Adjust DSA Timebase Calibration VI)
with the following parameters to perform the timebase adjustment:
calHandle: myCalHandle
referenceFrequency: 90000.0

18 |ni.com |NI PXIe-4464 Calibration Procedure
Committal
18. Call DAQmxCloseExtCal (DAQmx Close External Calibration VI) with the following
parameters to finish the calibration adjustment:
calHandle: myCalHandle
action: DAQmx_Val_Action_Commit or DAQmx_Val_Action_Cancel
Use the action cancel if there has been any error during the calibration or if you do not
want to save the new calibration constants in the device EEPROM.
Use the action commit if you want to save the new calibration constants in the device
onboard storage.
The device is now calibrated with respect to the external sources.
Reverification
After completing the adjustment procedure, repeat the Verification section to determine the
As Left status of the device. Some, but not all, performance characteristics are affected by
adjustment and would be subject to reverification after adjustment. Characteristics affected by
adjustment have As Left test limits in addition to As Found test limits. Characteristics unaffected
by adjustment solely have test limits with no additional qualification.
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 Where to
Go for Support for assistance in returning the device to NI.
Updating the Calibration Date without Performing
Adjustment
You can update the calibration date without performing the adjustment procedure. This might
be appropriate if the NI PXIe-4464 successfully passed each of the verification procedures
within the As Left test limits without adjustment. Complete the following steps to update the
calibration date:
1. Open a calibration session using the DAQmx Initialize External Calibration VI with the
following parameters:
•deviceName: Dev_name
•password: NI
•calHandle: &myCalHandle
2. Close the session with the DAQmx Close External Calibration VI with the following
parameters:
•calHandle: myCalHandle
•action: DAQmx_Val_Action_Commit

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Specifications
Refer to the NI PXIe-4464 Specifications for calibration intervals and detailed specification
information.
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