National Instruments PXIe-5423 Manual

CALIBRATION PROCEDURE
PXIe-5423
PXIe, 40 MHz Bandwidth, 1- or 2-Channel, 16-Bit PXI Waveform
Generator
This document contains the verification and adjustment procedures for the PXIe-5423. Refer
to ni.com/calibration for more information about calibration solutions.
Please review and become familiar with the entire procedure before beginning the calibration
process.
Contents
Required Software.....................................................................................................................1
Related Documentation.............................................................................................................2
Test Equipment..........................................................................................................................2
Test Conditions..........................................................................................................................4
Password................................................................................................................................... 5
Calibration Interval................................................................................................................... 5
As-Found and As-Left Limits................................................................................................... 5
Calibration Overview................................................................................................................5
Verifying the PXIe-5423........................................................................................................... 6
Verifying Timebase Accuracy...........................................................................................6
Verifying DC Voltage Accuracy........................................................................................7
Verifying AC Amplitude Accuracy...................................................................................9
Verifying Passband Flatness Accuracy........................................................................... 11
Adjusting the PXIe-5423........................................................................................................ 14
Adjusting Timebase.........................................................................................................14
Adjusting DC Voltage..................................................................................................... 15
Adjusting Passband Flatness...........................................................................................16
Reverification..........................................................................................................................18
Setting the Calibration Date and Due Date.............................................................................18
NI Services..............................................................................................................................18
Required Software
Calibrating the PXIe-5423 requires you to install the following software on the calibration
system:
• NI-FGEN 17.1 or later
The PXIe-5423 was first supported in NI-FGEN 17.1.
• LabVIEW 2016 or later, Full Development System or Professional Development System

You can download all required software from ni.com/downloads.
Related Documentation
For additional information, refer to the following documents as you perform the calibration
procedure:
•PXIe-5423 Getting Started Guide
•PXIe-5423 Specifications
•NI Signal Generators Help
•LabVIEW Help
Visit ni.com/manuals for the latest versions of these documents.
Test Equipment
Refer to the following table for a list of necessary test equipment, minimum requirements for
the test equipment, and model recommendations for calibration of the PXIe-5423.
If you do not have the recommended equipment, select a substitute calibration standard using
the minimum requirements specifications listed in the table.
Table 1. PXIe-5423 Test Equipment
Equipment Recommended
Model
Where Used Minimum Requirements
Oscilloscope PXIe-5160 or
PXIe-5171
Verifications:
• Timebase
accuracy
Adjustments:
• Timebase
Frequency resolution:
0.1 Hz
The ability to measure sine
waves ≥10 MHz with
amplitudes of 2 Vpk-pk to
5 Vpk-pk with 50 Ω input
impedance.
SMA (m)-to-
SMA (m) cable
— Verifications:
• Timebase
accuracy
Adjustments:
• Timebase
Frequency range: DC to
100 MHz
Impedance: 50 Ω
Length: <1 m
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Table 1. PXIe-5423 Test Equipment (Continued)
Equipment Recommended
Model
Where Used Minimum Requirements
Precision
frequency
reference
PXIe-6674T or
Rubidium
reference
Verifications:
• Timebase
accuracy
Adjustments:
• Timebase
Frequency accuracy:
100 ppb
The ability to PLL lock to
the oscilloscope.
DMM PXI-4071 Verifications:
• DC voltage
accuracy
• AC amplitude
accuracy
Adjustments:
• DC voltage
DC voltage range: ±5 V
DC voltage accuracy:
<40 ppm
AC voltage accuracy:
±0.1% of reading at 50 kHz
AC Input Range: 0.05 VRMS
to 5 VRMS
AC Input Impedance:
≥10 MΩ
Bandwidth: ≥100 kHz
Double banana
plug-to-BNC (f)
Pasternak PE9008 Verifications:
• DC voltage
accuracy
• AC amplitude
accuracy
Adjustments:
• DC voltage
Impedance: 50 Ω
SMA (m)-to-
BNC (m) cable
— Verifications:
• DC voltage
accuracy
• AC amplitude
accuracy
Adjustments:
• DC voltage
Frequency range: DC to
1 MHz
Impedance: 50 Ω
Length: <1 m
PXIe-5423 Calibration Procedure | © National Instruments Corporation | 3

Table 1. PXIe-5423 Test Equipment (Continued)
Equipment Recommended
Model
Where Used Minimum Requirements
Power sensor Rohde & Schwarz
(R&S) NRP-Z91
Verifications:
• Passband flatness
accuracy
Adjustments:
• Passband flatness
Range: -30 dBm to 23 dBm
Frequency range: 50 kHz to
100 MHz
Absolute Power Accuracy:
<0.048 dB for <100 MHz
Relative Power Accuracy:
<0.022 dB for <100 MHz
VSWR: <1.11
SMA (m)-to-N
(f) adapter
— Verifications:
• Passband flatness
accuracy
Adjustments:
• Passband flatness
Frequency range: DC to
100 MHz
Impedance: 50 Ω
Test Conditions
The following setup and environmental conditions are required to ensure the PXIe-5423 meets
published specifications:
• The PXIe-5423 is warmed up for 15 minutes at ambient temperature. Warm up begins
after the chassis is powered and the PXIe-5423 is recognized by the host and configured
using NI-FGEN.
• All test instruments are warmed up for at least the period of time stated in the
documentation for each instrument and self-calibration is performed. The warm-up time
ensures that the test instruments are at a stable operating temperature.
• Keep cabling as short as possible. Long cables act as antennas, picking up extra noise that
can affect measurements.
• Verify that all connections to the PXIe-5423, including front panel connections and
screws, are secure.
• Use shielded copper wire for all cable connections to the device. Use twisted-pair wire to
eliminate noise and thermal offsets.
• Maintain an ambient temperature of 23 °C ± 3 °C.
• Keep relative humidity between 10% and 90%, noncondensing.
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• Ensure that the PXI chassis fan speed is set to HIGH, that the fan filters (if present) are
clean, and that the empty slots contain slot blockers and filler panels. For more
information about cooling, refer to the Maintain Forced-Air Cooling Note to Users
document available at ni.com/manuals.
• Plug the PXI chassis and any other instrument standards into the same power strip to
avoid ground loops.
Password
The default password for password-protected operations is NI.
Related Information
Adjusting the PXIe-5423 on page 14
Setting the Calibration Date and Due Date on page 18
Calibration Interval
Recommended calibration interval 2 years
As-Found and As-Left Limits
The as-found limits are the published specifications for the PXIe-5423. NI uses these limits to
determine whether the PXIe-5423 meets the specifications when it is received for calibration.
Use the as-found limits during initial verification.
The as-left calibration limits are equal to the published NI specifications for the PXIe-5423,
less guard bands for measurement uncertainty, temperature drift, and drift 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.
Calibration Overview
Install the PXIe-5423 and configure it in NI Measurement & Automation Explorer (MAX)
before calibrating.
Calibration includes the following steps:
1. Self-calibration—Let the PXIe-5423 warm up for 15 minutes before self-calibrating the
PXIe-5423 by clicking the Self-Calibrate button in MAX or calling niFgen Self Cal.
2. Verification—Verify the existing operation of the device. This step confirms whether the
device is operating within the published specification prior to adjustment.
PXIe-5423 Calibration Procedure | © National Instruments Corporation | 5

3. Adjustment—Perform an external adjustment of the calibration constants of the device.
The adjustment procedure automatically stores the calibration date and temperature on
the EEPROM to allow traceability.
4. Self-calibration—Let the PXIe-5423 warm up for 15 minutes before self-calibrating the
PXIe-5423 by clicking the Self-Calibrate button in MAX or calling niFgen Self Cal.
5. Reverification—Repeat the Verification procedure to ensure that the device is operating
within the published specifications after adjustment.
Refer to the following sections to complete each procedure.
Related Information
Verifying the PXIe-5423 on page 6
Adjusting the PXIe-5423 on page 14
Verifying the PXIe-5423
This section provides instructions for verifying the PXIe-5423 specifications.
Self-calibrate the PXIe-5423 and all test instruments before beginning the verification
procedures.
Note Verification of the PXIe-5423 is complete only after you have successfully
completed all verification tests in this section using the as-found limits.
Note The performance verification procedures assume that adequate traceable
uncertainties are available for the calibration references.
Related Information
Calibration Overview on page 5
Verifying Timebase Accuracy
Follow this procedure to verify the frequency accuracy of the PXIe-5423 onboard timebase
(TCXO) using an oscilloscope.
Refer to the following table as you complete the following steps.
Table 3. Timebase Accuracy Verification
As-Found Limit As-Left Limit
±(1.5 ppm + 1 ppm per year1) ±0.28 ppm
1Where time drift starts at the latest external calibration date.
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1. Connect one end of the SMA (m)-to-SMA (m) cable to a channel of the PXIe-5423 and
the other end to a channel of the oscilloscope.
Note Timebase accuracy verification can be performed on either channel of
the two-channel PXIe-5423.
2. Lock the oscilloscope to the precision frequency reference using the PXI Clock.
3. Configure the oscilloscope to acquire a 10 MHz sine wave with the following settings:
•Vertical range: 5 Vpk-pk
•Sample rate: 250 MS/s
•Input impedance: 50 Ω
•Minimum number of points: 1,048,576 samples
4. Configure the PXIe-5423 with the following settings:
•Channel: Channel of the PXIe-5423 connected to the oscilloscope
•Output impedance: 50 Ω
•Output mode: Standard Function
•Waveform type: Sine
•Frequency: 10 MHz
•Amplitude: 2.5 Vpk-pk
•Offset: 0 V
•Reference Clock source: Onboard Reference Clock
5. Wait 1 second for settling.
6. Measure the peak frequency (Hz) using the oscilloscope and the Extract Single Tone
Information VI and record this as FMeasured.
7. Calculate the timebase error using the following formula:
Timebase Error (ppm) = FMeasured −107
10
8. Compare the frequency error to the appropriate limit from the Timebase Accuracy
Verification table.
Note Timebase accuracy verification is only required on one channel of the
two-channel PXIe-5423.
Verifying DC Voltage Accuracy
Follow this procedure to verify the DC voltage accuracy of the PXIe-5423 by comparing the
voltage sourced by the PXIe-5423 to the value measured by the DMM.
Refer to the following table as you complete the following steps.
PXIe-5423 Calibration Procedure | © National Instruments Corporation | 7

Table 4. DC Voltage Accuracy Verification
DMM
Range (V)
Amplitude
Range (Vpk-pk)
Offset (V) Expected
Amplitude (V)
As-Found
Test Limit
(mV)
As-Left
Test Limit
(mV)
1 10 7.340 3.670 3.670 ±39.04 ±11.17
2 2.268 1.134 1.134 ±12.41 ±3.45
3 2.185 1.092 1.092 ±11.97 ±3.33
4 2.102 1.051 1.051 ±11.54 ±3.20
5 2.019 1.009 1.009 ±11.10 ±3.07
6 1 1.936 0.968 0.968 ±10.66 ±2.95
7 1.854 0.927 0.927 ±10.23 ±2.82
8 1.770 0.885 0.885 ±9.79 ±2.69
9 1.686 0.843 0.843 ±9.35 ±2.57
10 0.696 0.348 0.348 ±4.15 ±1.06
11 0.214 0.107 0.107 ±1.62 ±0.68
12 0.066 0.033 0.033 ±0.85 ±0.53
13 10 7.340 -3.670 -3.670 ±39.04 ±11.17
14 2.268 -1.134 -1.134 ±12.41 ±3.45
15 2.185 -1.092 -1.092 ±11.97 ±3.33
16 2.102 -1.051 -1.051 ±11.54 ±3.20
17 2.019 -1.009 -1.009 ±11.10 ±3.07
18 1 1.936 -0.968 -0.968 ±10.66 ±2.95
19 1.854 -0.927 -0.927 ±10.23 ±2.82
20 1.770 -0.885 -0.885 ±9.79 ±2.69
21 1.686 -0.843 -0.843 ±9.35 ±2.57
22 0.696 -0.348 -0.348 ±4.15 ±1.06
23 0.214 -0.107 -0.107 ±1.62 ±0.68
24 0.066 -0.033 -0.033 ±0.85 ±0.53
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1. Connect one end of the SMA (m)-to-BNC (m) cable to CH 0 of the PXIe-5423. Connect
the other end to the double banana plug-to-BNC (f) adapter, and connect the double
banana plug-to-BNC (f) adapter to the HI and LO connectors of the DMM.
2. Configure the DMM with the following settings:
•Function: DC Voltage
•Resolution: 7.5 digits
•Aperture time: 100 ms
•Number of averages: 4
•Auto zero: Enabled
•ADC calibration: Enabled
•Vertical range: DMM range listed in the DC Voltage Accuracy Verification table
3. Configure the PXIe-5423 with the following settings:
•Channel: Channel of the PXIe-5423 connected to the DMM
•Load impedance: 1 MΩ
•Output mode: Standard Function
•Waveform type: User
•Amplitude: Amplitude range listed in the DC Voltage Accuracy Verification table
•Offset: Offset listed in the DC Voltage Accuracy Verification table
•Waveform data: Array of zeros
•Waveform size: 8,192 samples
4. Wait 1 second for settling.
5. Measure the DC voltage (V) using the DMM and record this as DC Voltage Measured.
6. Calculate the DC voltage error using the following formula:
DC Voltage Error (mV) = (DC Voltage Measured - Expected Amplitude) * 103
where Expected Amplitude is the expected amplitude (V) listed in the DC Voltage
Accuracy Verification table.
7. Compare the DC voltage error to the appropriate limit from the DC Voltage Accuracy
Verification table.
8. Repeat steps 2 through 7 for each configuration listed in the DC Voltage Accuracy
Verification table.
9. If you are verifying a two-channel PXIe-5423, complete the following steps to verify
CH 1:
a) Abort waveform generation on the PXIe-5423.
b) Disconnect the SMA (m)-to-BNC (m) cable from CH 0 and connect it to CH 1 of the
PXIe-5423.
c) Repeat steps 2 through 8.
Verifying AC Amplitude Accuracy
Follow this procedure to verify the AC amplitude accuracy of the PXIe-5423 by comparing the
amplitude sourced by the PXIe-5423 to the amplitude measured by the DMM.
Refer to the following table as you complete the following steps.
PXIe-5423 Calibration Procedure | © National Instruments Corporation | 9

Table 5. AC Amplitude Accuracy Verification
DMM Range
(VRMS)
Amplitude
Range (Vpk-pk)
Expected
Amplitude
(Vpk-pk)
As-Found Test
Limit (mVpk-pk)
As-Left Test
Limit (mVpk-pk)
1 5 7.34 7.34 ±74.40 ±32.66
2 2.27 2.27 ±23.70 ±10.10
3 2.18 2.18 ±22.80 ±9.70
4 2.1 2.1 ±22.00 ±9.35
5 2.02 2.02 ±21.20 ±8.99
6 1.94 1.94 ±20.40 ±8.63
7 1.85 1.85 ±19.50 ±8.23
8 1.77 1.77 ±18.70 ±7.88
9 1.68 1.68 ±17.80 ±7.48
10 0.5 0.69 0.69 ±7.90 ±3.07
11 0.21 0.21 ±3.10 ±1.50
12 0.065 0.065 ±1.65 ±0.81
1. Connect one end of the SMA (m)-to-BNC (m) cable to CH 0 of the PXIe-5423. Connect
the other end to the double banana plug-to-BNC (f) adapter, and connect the double
banana plug-to-BNC (f) adapter to the HI and LO connectors of the DMM.
2. Configure the DMM with the following settings:
•Function: AC Voltage
•Resolution: 6.5 digits
•Aperture time: 100 ms
•Number of averages: 4
•Minimum frequency: 49 kHz
•Auto zero: Enabled
•ADC calibration: Enabled
•Vertical range: DMM range listed in the AC Amplitude Accuracy Verification table
3. Configure the PXIe-5423 with the following settings:
•Channel: Channel of the PXIe-5423 connected to the DMM
•Load impedance: 1 MΩ
•Output mode: Standard Function
•Waveform type: Sine
•Frequency: 50 kHz
10 | ni.com | PXIe-5423 Calibration Procedure

•Amplitude: Amplitude range listed in the AC Amplitude Accuracy Verification table
•Offset: 0 V
4. Wait 1 second for settling.
5. Measure the AC amplitude (VRMS) using the DMM and record this as
AC AmplitudeMeasured.
6. Convert the recorded AC AmplitudeMeasured voltage from VRMS to Vpk-pk using the
following formula:
Vpk −pk =VRMS * 2 2
7. Calculate the AC amplitude error using the following formula:
AC Amplitude Error (mV) = (AC AmplitudeMeasured - Expected Amplitude) * 103
where Expected Amplitude is the expected amplitude (Vpk-pk) listed in the AC Amplitude
Accuracy Verification table.
8. Compare the AC amplitude error to the appropriate limit from the AC Amplitude
Accuracy Verification table.
9. Repeat steps 2 through 8 for each configuration listed in the AC Amplitude Accuracy
Verification table.
10. If you are verifying a two-channel PXIe-5423, complete the following steps to verify
CH 1:
a) Abort waveform generation on the PXIe-5423.
b) Disconnect the SMA (m)-to-BNC (m) cable from CH 0 and connect it to CH 1 of the
PXIe-5423.
c) Repeat steps 2 through 9.
Verifying Passband Flatness Accuracy
Follow this procedure to verify the passband flatness accuracy of the PXIe-5423 by comparing
the flatness sourced by the PXIe-5423 to the value measured by the power sensor.
Refer to the following table as you complete the following steps.
Table 6. Passband Flatness Accuracy Verification
Amplitude Range
(Vpk-pk)
Frequency (MHz) As-Found Test
Limit (dB)
As-Left Test Limit
(dB)
1 3.500 0.05 — —
2 1 ±0.40 ±0.25
3 20 ±0.60 ±0.14
4 40 ±0.80 ±0.20
PXIe-5423 Calibration Procedure | © National Instruments Corporation | 11

Table 6. Passband Flatness Accuracy Verification (Continued)
Amplitude Range
(Vpk-pk)
Frequency (MHz) As-Found Test
Limit (dB)
As-Left Test Limit
(dB)
5 1.040 0.05 — —
6 1 ±0.40 ±0.25
7 20 ±0.40 ±0.11
8 40 ±0.45 ±0.10
11 0.956 0.05 — —
12 1 ±0.40 ±0.25
13 20 ±0.40 ±0.11
14 40 ±0.45 ±0.10
17 0.867 0.05 — —
18 1 ±0.40 ±0.25
19 20 ±0.40 ±0.11
20 40 ±0.45 ±0.10
23 0.780 0.05 — —
24 1 ±0.40 ±0.25
25 20 ±0.40 ±0.11
26 40 ±0.45 ±0.10
29 0.321 0.05 — —
30 1 ±0.40 ±0.25
31 20 ±0.40 ±0.11
32 40 ±0.45 ±0.10
35 0.099 0.05 — —
36 1 ±0.40 ±0.25
37 20 ±0.40 ±0.11
38 40 ±0.45 ±0.10
1. Connect the SMA (m)-to-N (f) adapter to the power sensor.
12 | ni.com | PXIe-5423 Calibration Procedure

2. Zero the power sensor.
a) Ensure that the power sensor is not connected to any signals.
b) Zero the power sensor using the built-in function, according to the power sensor
documentation.
3. Connect the power sensor with the SMA (m)-to-N (f) adapter attached to CH 0 of the
PXIe-5423.
Note Ensure the power sensor is supported to the extent that excessive strain
is not applied to the connected channel of the PXIe-5423 or to the power sensor
connector.
4. Configure the power sensor with the following settings:
•Maximum noise ratio: 0.005 dB
•Auto range: Enabled
•Power measurement: Continuous average
•Path selection: Automatic
•Averaging: Automatic
•Aperture: 20 ms
•Timeout: 10 s
•Frequency: Frequency listed in the Passband Flatness Accuracy Verification table
5. Configure the PXIe-5423 with the following settings:
•Load impedance: 50 Ω
•Output mode: Standard Function
•Waveform type: Sine
•Amplitude: Amplitude range listed in the Passband Flatness Accuracy Verification
table
•Frequency: Frequency listed in the Passband Flatness Accuracy Verification table
•Offset: 0 V
6. Wait 1 second for settling.
7. Measure and record the power (dBm) using the power sensor.
• When the power is measured at 0.05 MHz, record this as PMeasured at 0.05 MHz.
• When the power is measured at all frequencies other than 0.05 MHz, record this as
PMeasured at Current Test Frequency.
8. Skip this step if the PXIe-5423 frequency is configured to 0.05 MHz. Calculate the
passband flatness error using the following formula:
Passband Flatness Error (dB) = PMeasured at 0.05 MHz - PMeasured at Current Test Frequency
where PMeasured at 0.05 MHz (dBm) and PMeasured at Current Test Frequency (dBm) are values for
power measured at the same amplitude range listed in the Passband Flatness Accuracy
Verification table.
9. Repeat steps 4 through 8 for each configuration listed in the Passband Flatness Accuracy
Verification table.
10. For each configuration, compare the passband flatness error to the appropriate limit from
the Passband Flatness Accuracy Verification table.
PXIe-5423 Calibration Procedure | © National Instruments Corporation | 13

11. If you are verifying a two-channel PXIe-5423, complete the following steps to verify
CH 1:
a) Abort waveform generation on the PXIe-5423.
b) Disconnect the SMA (m)-to-N (f) adapter and power sensor assembly from CH 0
and connect the assembly to CH 1 of the PXIe-5423.
c) Repeat steps 4 through 10.
Adjusting the PXIe-5423
Follow this procedure to adjust the PXIe-5423 to meet published specifications.
Note All adjustments must be completed in the same external calibration session.
1. Call niFgen ni5433 Open Ext Cal Session to obtain an external calibration session.
2. Complete the Adjusting Timebase procedure.
3. Complete the Adjusting DC Voltage procedure.
4. Complete the Adjusting Passband Flatness procedure.
5. Call niFgen ni5433 Close Ext Cal Session with the following settings:
•Action: If the external adjustment procedure completed without any errors, set this
control to Commit to store the new calibration constants, adjustment time,
adjustment date, and adjustment temperature to the onboard memory. If any errors
occurred during the external adjustment procedure, or if you want to abort the
operation, set the control to Abort to discard the new calibration constants without
changing any of the calibration data stored in the onboard memory.
Self-calibrate the PXIe-5423 after completing adjustment and before reverification.
Related Information
Password on page 5
Calibration Overview on page 5
Adjusting Timebase
Follow this procedure to adjust the internal timebase reference (TCXO) of the PXIe-5423.
1. Connect one end of the SMA (m)-to-SMA (m) cable to a channel of the PXIe-5423 and
the other end to a channel of the oscilloscope.
Note Timebase adjustment can be performed on either channel of the two-
channel PXIe-5423.
2. Lock the oscilloscope to the precision frequency reference using the PXI Clock.
3. Configure the oscilloscope with the following settings:
•Vertical range: 5 Vpk-pk
•Sample rate: 250 MS/s
14 | ni.com | PXIe-5423 Calibration Procedure

•Input impedance: 50 Ω
•Minimum number of points: 1,048,576 samples
4. Call niFgen ni5433 Timebase Cal Initialize with the following settings:
•Channel: Channel of the PXIe-5423 connected to the oscilloscope
5. Call niFgen ni5433 Timebase Cal Configure.
6. Wait 1 second for settling.
7. Measure the frequency of the signal using the oscilloscope and the Extract Single Tone
Information VI.
8. Call niFgen ni5433 Timebase Cal Adjust with the following settings:
•Measured Frequency: Frequency of the waveform present on the connected
channel of the PXIe-5423 and measured by the oscilloscope in the previous step
9. If the Timebase Cal Complete output of niFgen ni5433 Timebase Cal Adjust returns
FALSE, repeat steps 5 through 8 until Timebase Cal Complete returns TRUE.
Note Timebase adjustment is only required on one channel of the two-channel
PXIe-5423.
Adjusting DC Voltage
Follow this procedure to adjust the DC voltage of the PXIe-5423.
1. Connect one end of the SMA (m)-to-BNC (m) cable to a channel of the PXIe-5423.
Connect the other end to the double banana plug-to-BNC (f) adapter, and connect the
double banana plug-to-BNC (f) adapter to the HI and LO connectors of the DMM.
Note DC voltage adjustment can be performed on either channel of the two-
channel PXIe-5423.
2. Call niFgen ni5433 ADC Cal Initialize with the following settings:
•Channel: Channel of the PXIe-5423 connected to the DMM
3. Call niFgen ni5433 ADC Cal Configure to obtain the Approximate Voltage Generated
(Vpk-pk) output.
4. Wait 1 second for settling.
5. Configure the DMM with the following settings:
•Function: DC Voltage
•Resolution: 7.5 digits
•Aperture time: 100 ms
•Number of averages: 4
•Auto zero: Enabled
•ADC calibration: Enabled
•Range: Range returned by the Approximate Voltage Generated (Vpk-pk) output of
niFgen ni5433 ADC Cal Configure in step 3
6. Measure the voltage of the signal using the DMM.
7. Call niFgen ni5433 ADC Cal Adjust with the following settings:
•Measured Voltage: Voltage of the waveform present on the connected channel of
the PXIe-5423 and measured by the DMM in the previous step
PXIe-5423 Calibration Procedure | © National Instruments Corporation | 15

8. If the ADC Cal Complete output of niFgen ni5433 Timebase Cal Adjust returns FALSE,
repeat steps 3 through 7 until ADC Cal Complete returns TRUE.
Note DC voltage adjustment is only required on one channel of the two-channel
PXIe-5423.
Adjusting Passband Flatness
Complete one of the following procedures depending on the channel count of the PXIe-5423
you are adjusting:
•Adjusting Passband Flatness of a One-Channel PXIe-5423
•Adjusting Passband Flatness of a Two-Channel PXIe-5423
Adjusting Passband Flatness of a One-Channel PXIe-5423
Follow this procedure to adjust the passband flatness of a one-channel PXIe-5423.
Note Ensure the power sensor, with the SMA (m)-to-N (f) adapter attached, has
been zeroed within the past hour.
1. Call niFgen ni5433 Flatness Cal Initialize.
2. Call niFgen ni5433 Flatness Cal Configure.
3. Call niFgen ni5433 Flatness Cal Adjust with the following settings:
•Measured Power (dBm): 0 dBm
4. Connect the power sensor with the SMA (m)-to-N (f) adapter attached to CH 0 of the
PXIe-5423.
5. Call niFgen ni5433 Flatness Cal Configure to obtain the Current Configuration output.
6. Configure the power sensor with the following settings:
•Auto range: Enabled
•Maximum noise ratio: 0.005 dB
•Power measurement: Continuous average
•Path selection: Automatic
•Averaging: Automatic
•Aperture: 20 ms
•Timeout: 10 s
•Frequency: Frequency returned by the Current Configuration output of niFgen
ni5433 Flatness Cal Configure in the previous step
7. Wait 1 second for settling.
8. Measure the power of the signal using the power sensor.
9. Call niFgen ni5433 Flatness Cal Adjust with the following settings:
•Measured Power (dBm): Power of the waveform present on CH 0 of the
PXIe-5423 and measured by the power sensor in the previous step in dBm
10. If the Flatness Cal Complete output of niFgen ni5433 Timebase Cal Adjust returns
FALSE, repeat steps 5 through 9 until Flatness Cal Complete returns TRUE.
16 | ni.com | PXIe-5423 Calibration Procedure

Adjusting Passband Flatness of a Two-Channel PXIe-5423
Follow this procedure to adjust the passband flatness of a two-channel PXIe-5423.
Note Ensure the power sensor, with the SMA (m)-to-N (f) adapter attached, has
been zeroed within the past hour.
1. Call niFgen ni5433 Flatness Cal Initialize.
2. Call niFgen ni5433 Flatness Cal Configure.
3. Call niFgen ni5433 Flatness Cal Adjust with the following settings:
•Measured Power (dBm): 0 dBm
4. Connect the power sensor with the SMA (m)-to-N (f) adapter attached to CH 0 of the
PXIe-5423.
5. Call niFgen ni5433 Flatness Cal Configure to obtain the Current Configuration and
Next Configuration outputs.
6. Configure the power sensor with the following settings:
•Auto range: Enabled
•Maximum noise ratio: 0.005 dB
•Power measurement: Continuous average
•Path selection: Automatic
•Averaging: Automatic
•Aperture: 20 ms
•Timeout: 10 s
•Frequency: Frequency returned by the Current Configuration output of niFgen
ni5433 Flatness Cal Configure in the previous step
7. Wait 1 second for settling.
8. Measure the power of the signal using the power sensor.
9. Call niFgen ni5433 Flatness Cal Adjust with the following settings:
•Measured Power (dBm): Power of the waveform present on CH 0 of the
PXIe-5423 and measured by the power sensor in the previous step in dBm
10. If the Next Configuration output of niFgen ni5433 Flatness Cal Configure obtained in
step 5 returns CH 0, repeat steps 5 through 9. If the Next Configuration output of niFgen
ni5433 Flatness Cal Configure obtained in step 5 returns CH 1, continue to step 11.
11. Connect the SMA (m)-to-N (f) adapter and power sensor assembly to CH 1 of the
PXIe-5423.
12. Call niFgen ni5433 Flatness Cal Configure to obtain the Current Configuration output.
13. Configure the power sensor with the following settings:
•Auto range: Enabled
•Maximum noise ratio: 0.005 dB
•Power measurement: Continuous average
•Path selection: Automatic
•Averaging: Automatic
•Aperture: 20 ms
PXIe-5423 Calibration Procedure | © National Instruments Corporation | 17

•Timeout: 10 s
•Frequency: Frequency returned by the Current Configuration output of niFgen
ni5433 Flatness Cal Configure in the previous step
14. Wait 1 second for settling.
15. Measure the power of the signal using the power sensor.
16. Call niFgen ni5433 Flatness Cal Adjust with the following settings:
•Measured Power (dBm): Power of the waveform present on CH 1 of the
PXIe-5423 and measured by the power sensor in the previous step in dBm
17. If the Flatness Cal Complete output of niFgen ni5433 Timebase Cal Adjust returns
FALSE, repeat steps 12 through 16 until Flatness Cal Complete returns TRUE.
Reverification
Repeat the Verifying the PXIe-5423 on page 6 procedures to determine the as-left status of the
PXIe-5423.
Note If any test fails reverification after performing an adjustment, verify that you
have met the test conditions before returning your PXIe-5423 to NI. Refer to the NI
Services section for information about support resources or service requests.
Setting the Calibration Date and Due Date
After completing all verifications or reverifications, set the calibration date and a calibration
due date for the PXIe-5423 using either Measurement Automation Explorer (MAX) or the
LabVIEW NI System Configuration API.
NI recommends a calibration due date of the date of external calibration plus the external
calibration interval for the PXIe-5423.
• MAX—Navigate to the External Calibration section of the Settings tab and update the
Calibration Date and Calibration Due Date entries. Click Save.
• LabVIEW NI System Configuration API—Use the Update Calibration VI to set the
calibration date and calibration due date.
The calibration due date can be either a specific date or an interval in months.
Related Information
Password on page 5
NI Services
Visit ni.com/support to find support resources including documentation, downloads, and
troubleshooting and application development self-help such as tutorials and examples.
Visit ni.com/services to learn about NI service offerings such as calibration options, repair, and
replacement.
18 | ni.com | PXIe-5423 Calibration Procedure

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