NI PXI-5422 Manual

PXI-5422

CALIBRATION PROCEDURE
NI PXI-5422
This document contains instructions for calibrating the NI PXI-5422 arbitrary waveform
generator. This calibration procedure is intended for metrology labs. It describes specific
programming steps for writing an external calibration procedure for the NI PXI-5422.
Refer to ni.com/calibration for additional information about calibration solutions from
National Instruments.
Contents
Software Requirements............................................................................................................. 1
Documentation Requirements .................................................................................................. 2
Password................................................................................................................................... 3
Calibration Interval................................................................................................................... 3
Self-Calibration Procedures...................................................................................................... 3
MAX................................................................................................................................. 4
FGEN Soft Front Panel..................................................................................................... 4
NI-FGEN .......................................................................................................................... 4
External Calibration Options ....................................................................................................5
Complete Calibration........................................................................................................ 6
Optional Calibration ......................................................................................................... 6
External Calibration Requirements .......................................................................................... 8
Test Equipment................................................................................................................. 8
Test Conditions.................................................................................................................9
External Calibration Procedures............................................................................................... 9
Writing Your Calibration Procedure ................................................................................ 9
Calibration Procedures in LabVIEW........................................................................ 9
Calibration Procedures in LabWindows/CVI........................................................... 9
Calibration Procedures in C...................................................................................... 10
Verifying NI PXI-5422 Specifications ............................................................................. 10
Verifying the Oscillator Frequency Accuracy.......................................................... 11
Verifying the DC Gain and Offset Accuracy ........................................................... 14
Verifying the AC Voltage Amplitude Absolute Accuracy....................................... 27
Verifying Frequency Response (Flatness)................................................................ 30
Adjusting the NI PXI-5422............................................................................................... 37
Initializing the External Calibration Session ............................................................ 39
Adjusting the Analog Output.................................................................................... 39
Adjusting the Oscillator Frequency.......................................................................... 52
Adjusting the Calibration ADC ................................................................................ 55
Closing the External Adjustment Session ................................................................ 59

2|ni.com |NI PXI-5422 Calibration Procedure
Calibration Utilities................................................................................................................... 60
MAX .................................................................................................................................60
FGEN SFP ........................................................................................................................60
NI-FGEN .......................................................................................................................... 60
Where to Go for Support ..........................................................................................................61
Software Requirements
Calibrating the NI PXI-5422 requires installing NI-FGEN version 2.2 or later on the calibration
system. You can download NI-FGEN from the National Instruments website at ni.com/
updates. NI-FGEN supports programming the Self-Calibration Procedures and the External
Calibration Procedures in the LabVIEW, LabWindows™/CVI™, and C application
development environments (ADEs). When you install NI-FGEN, you need to install support
only for the ADE that you intend to use.
LabVIEW support is in the niFgen.llb file, and all calibration VIs appear in the NI-FGEN
Calibration palette. For LabWindows/CVI users, the NI-FGEN function panel (niFgen.fp)
provides access to the available functions.
For the locations of files you may need to calibrate your device, refer to the NI-FGEN Readme,
which is available on the NI-FGEN DVD.
Calibration functions are C function calls or LabVIEW VIs in NI-FGEN. In this document, the
C function call is shown first, followed by the corresponding LabVIEW VI or NI-FGEN
LabVIEW property node, in parentheses. The C function calls are valid for any compiler capable
of calling a 32-bit DLL. Many of the functions use constants defined in the niFgen.h file.
To use these constants in C, you must include niFgen.h in your code when you write the
calibration procedure. Refer to Table 1 for file locations.
Table 1. Calibration File Locations
File Name and Location Description
IVI\Bin\niFgen_32.dll The NI-FGEN library, which provides the
functionality for calibrating the
NI PXI-5422.
IVI\Lib\msc\niFgen.lib Allows you to create applications that call
functions in the niFgen_32.dll:
• For Microsoft Visual C/C++, link to
msc\niFgen.lib.
• For LabWindows/CVI, link to the
library appropriate to your current
compatibility mode (msc for
Microsoft Visual C/C++).

NI PXI-5422 Calibration Procedure |© National Instruments |3
The calibration process is described in the Self-Calibration Procedures and the External
Calibration Procedures sections, including step-by-step instructions on calling the appropriate
calibration functions.
Documentation Requirements
Consult the following documents for information about the NI PXI-5422, NI-FGEN, and your
application software. All documents are available on ni.com, and the Help files install with the
software.
IVI\Include\niFgen.h A header file for the accessible functions
in the niFgen_32.dll. You must
include this file in any C code that you
write to call these functions.
<LabVIEW>\instr.lib\niFgen\
niFgen.llb (LabVIEW)
Contains VIs that correspond to the
functions in the niFgen_32.dll.
IVI\Drivers\niFgen\niFgen.fp(CVI) Contains the function panels for the
function in the niFgen32.dll.
NI Signal Generators Getting Started Guide
Contains: NI-FGEN installation, hardware installation, and hardware programming
NI PXI-5422 Specifications
Contains: NI PXI-5422 specifications and calibration interval
NI-FGEN Readme
Contains: Operating system and application software support in NI-FGEN
NI Signal Generators Help
Contains: Detailed information about NI PXI-5422
Table 1. Calibration File Locations (Continued)
File Name and Location Description

4|ni.com |NI PXI-5422 Calibration Procedure
Password
The default calibration password is NI.
Calibration Interval
National Instruments recommends a calibration interval of two years for the NI PXI-5422. You
should adjust the recommended calibration interval based on the measurement accuracy
demands of your application. Refer to the External Calibration Options section for more
information.
Self-Calibration Procedures
The NI PXI-5422 can perform self-calibration, which adjusts the gain and offset of the main and
direct analog paths. Self-calibration exclusively uses an onboard A/D converter (ADC) to
measure the output voltage. You can implement self-calibration on the NI PXI-5422 by
following procedures similar to the Verifying the DC Gain and Offset Accuracy and the
Adjusting the Analog Output procedures described in this document. However, output
impedance, oscillator frequency, and the calibration ADC are not adjusted during
self-calibration.
Caution Although you can use self-calibration repeatedly, self-calibrating the
NI PXI-5422 more than a few times a day may cause excessive wear on the relays
over time.
You can initiate self-calibration interactively from Measurement & Automation Explorer
(MAX) or from the FGEN Soft Front Panel (SFP). Alternately, you can initiate self-calibration
programmatically using NI-FGEN.
LabVIEW Help
Contains: LabVIEW programming concepts and reference information about
NI-FGEN VIs and functions
NI-FGEN C Reference Help
Contains: Reference information for NI-FGEN C functions and NI-FGEN
C properties

NI PXI-5422 Calibration Procedure |© National Instruments |5
MAX
To initiate self-calibration from MAX, complete the following steps:
1. Launch MAX.
2. Select My System»Devices and Interfaces»PXI System.
3. Select the device that you want to calibrate.
4. Initiate self-calibration in one of the following ways:
•ClickSelf-Calibrate in the upper right corner.
• Right-click the device name and select Self-Calibrate from the drop-down menu.
FGEN Soft Front Panel
To initiate self-calibration from the FGEN SFP, complete the following steps:
1. Select the device that you want to calibrate using the Device Configuration dialog box
(Edit»Device Configuration).
2. Open the Calibration dialog box (Utility»Calibration).
3. Click Perform self-calibration.
NI-FGEN
To self-calibrate the NI PXI-5422 programmatically using NI-FGEN, complete the following
steps:
1. Call niFgen_init (niFgen Initialize VI) to open an NI-FGEN session using the following
parameters:
•resourceName: The name of the device that you want to calibrate. You can find this
name under Devices and Interfaces in MAX.
•IDQuery: VI_TRUE
•resetDevice: VI_TRUE
•vi: A pointer to a ViSession. The variable passed by reference through this parameter
receives the value that identifies the session created by this function. This value acts as the
session handle and is passed as the first parameter to all subsequent NI-FGEN functions.
2. Call niFgen_SelfCal (niFgen Self Cal VI) using the following parameter:
•vi: The session handle returned from niFgen_init
3. Call niFgen_close (niFgen Close VI) to close the NI-FGEN session using the following
parameter:
•vi: The session handle returned from niFgen_init

6|ni.com |NI PXI-5422 Calibration Procedure
External Calibration Options
External calibration involves both verification and adjustment. Verification is the process of
testing the device to ensure that the output accuracy is within certain specifications. You can use
verification to ensure that the adjustment process was successful or to determine if the
adjustment process needs to be performed.
Adjustment is the process of measuring and compensating for device performance to improve
the output accuracy. Performing an adjustment updates the calibration date, resetting the
calibration interval. The device is guaranteed to meet or exceed its published specifications for
the duration of the calibration interval.
This document provides two sets of test limits for most verification stages, the calibration test
limits and the published specifications. The calibration test limits are more restrictive than the
published specifications. If all the output errors determined during verification fall within the
calibration test limits, the device is guaranteed to meet or exceed its published specifications for
a full calibration interval (two years). For this reason, you must verify against the calibration test
limits when performing verification after adjustment.
If all the output errors determined during verification fall within the published specifications, but
not within the calibration test limits, the device meets its published specifications. However, the
device may not remain within these specifications for another two years. The device will meet
published specifications for the rest of the current calibration interval.
In this case, you can perform an adjustment if you want to improve the output accuracy or reset
the calibration interval. If some output errors determined during verification do not fall within
the published specifications, you must perform an adjustment to restore the device operation to
its published specifications.
The Complete Calibration section describes the recommended calibration procedure. The
Optional Calibration section describes alternate procedures that allow you to skip adjustment if
the device already meets its calibration test limits or published specifications.

NI PXI-5422 Calibration Procedure |© National Instruments |7
Complete Calibration
Performing a complete calibration is the recommended way to guarantee that the NI PXI-5422
meets or exceeds its published specifications for a two-year calibration interval. At the end of
the complete calibration procedure, you verify that the output error falls within the calibration
test limits. Figure 1 shows the programming flow for complete calibration.
Figure 1. Complete Calibration Programming Flow
Optional Calibration
You can choose to skip the adjustment steps of the calibration procedure if the output error is
within the calibration test limits or the published specifications during the first verification. If all
the output errors determined during the first verification fall within the calibration test limits, the
device is guaranteed to meet or exceed its published specifications for a full calibration interval.
In this case, you can update the calibration date, effectively resetting the calibration interval,
without actually performing an adjustment. Refer to the Adjusting the NI PXI-5422 section for
more information.
Adjust
(Cal Datesand
Temperatures
Updated)
Verify
Document
Post-Adjustment
Results
Meets
Calibration
Te st Limits?
Review
Ver ification/
Adjustment
Procedure or
Return Device
Verify
Self-Calibrate
Calibration/
Verification
Complete
Ye sNo
Document
Pre-Adjustment
Results

8|ni.com |NI PXI-5422 Calibration Procedure
If all the output errors determined during the first verification fall within the published
specifications, but not within the calibration test limits, adjustment is also optional. However,
you cannot update the calibration date because the device may not necessarily operate within the
published specifications for an additional two years.
Note Regardless of the results of the first verification, if you choose to perform an
adjustment, you must verify that the output error falls within the calibration test limits
at the end of the calibration procedure.
Figure 2 shows the programming flow for the optional calibration.
Figure 2. Optional Calibration Programming Flow
Self-Calibrate
Verify
Document
Pre-Adjustment
Results
Meets
Calibration
Te st Limits?
Meets
Published
Specifications?
Update Calibration
Datesand
Temperatures
Without Adjusting
Results
Within
Published Specs
(Adjustment
Optional)
Adjust
Anyway?
Adjust
(Cal Datesand
Temperatures
Updated)
Verify Document
Post-Adjustment
Results
Meets
Calibration
Te st Limits?
Calibration/
Verification
Complete
Review
Verification/
Adjustment
Procedure or
Return Device
Ye sNo
Ye sNo
Ye sNo
Ye s
No

NI PXI-5422 Calibration Procedure |© National Instruments |9
External Calibration Requirements
This section describes the test equipment and test conditions required for calibration.
Test Equipment
External calibration requires different equipment for each applicable specification. Refer to
Table 2 for a list of equipment.
Table 2. Equipment Required for Calibrating the NI PXI-5422
Instrument
Applicable
Specification
Minimum
Specifications
Recommended
Instrument
Digital multimeter
(DMM)
AC accuracy,
DC gain and
offset
DCV accuracy:
≤0.05%
DC input impedance:
≥1GΩ
ACV accuracy:
≤0.16%
AC input impedance:
≥1MΩ
Bandwidth: ≥100 kHz
Resolution ≤1 µV
NI PXI-4070
Agilent HP 34401A
Keithley 2000
Banana(m)-to-BNC(f)
adapter
— —
BNC(m)-to-SMB(f)
cable
50 Ω, RG-223 —
Spectrum analyzer,
frequency meter, or
signal source analyzer
Frequency
accuracy
Ability to measure
10 MHz or greater
sine waves
Frequency accuracy
to ≤500 ppb
NI PXI-5660
Agilent HP 8560E
Agilent HP 53131A
or HP 53132A with
timebase option
001, 010, or 012
Rohde & Schwarz
(R&S) FSUP

10 |ni.com |NI PXI-5422 Calibration Procedure
Test Conditions
Follow these guidelines to optimize the connections and the environment during calibration:
• Keep connections to the NI PXI-5422 short.
• Keep relative humidity below 80%.
• Maintain a temperature between 18 C and 28 C.
• Observe the 15 minute warm-up time.
External Calibration Procedures
The complete external calibration procedure consists of self-calibrating, verifying the
performance of the NI PXI-5422, adjusting the calibration constants, and verifying again after
the adjustments. In some cases, the complete calibration procedure may not be required. Refer
to the External Calibration Options section for more information.
The external calibration procedure automatically stores the calibration date to allow traceability.
Writing Your Calibration Procedure
Before you begin to write your calibration program, review the programming flowcharts in
Figures 1 and 2.
Calibration Procedures in LabVIEW
To write calibration procedures in LabVIEW, you must use the VIs included in the
niFgen.llb file. After installation, these VIs appear within the NI-FGEN Calibration palette.
Calibration Procedures in LabWindows/CVI
To write calibration procedures in LabWindows/CVI, you must use the function panels included
in the niFgen.fp file. After installation, you can locate the calibration functions under the
Calibration class node.
Power meter/sensor Frequency
response
(flatness)
VSWR: (50 kHz to
120 MHz) ≤1.11
Relative power
accuracy: ≤0.022 dB
R&S NRP-Z91
Type N(f)-to-SMB
plug adapter
VSWR: 1.3 Pasternak PE9316
Table 2. Equipment Required for Calibrating the NI PXI-5422 (Continued)
Instrument
Applicable
Specification
Minimum
Specifications
Recommended
Instrument

NI PXI-5422 Calibration Procedure |© National Instruments |11
Calibration Procedures in C
To write calibration procedures in C, you must include the niFgen.h file in the code that calls
the calibration functions, and you must link the niFgen.lib file into the build of your
executable.
Verifying NI PXI-5422 Specifications
Note Always self-calibrate the NI PXI-5422 before beginning a verification
procedure.
This section provides instructions for verifying the NI PXI-5422 specifications. This section
also includes instructions for updating the calibration cycle.
Verification determines whether the device is performing within its specifications prior to
external adjustment. Verification and external adjustment together compose a complete
calibration. To verify that the NI PXI-5422 still meets its specifications, you must use NI-FGEN
to control the NI PXI-5422.
The steps in the verification procedures describe the code that you use to generate the
appropriate signals, as well as the NI-FGEN function calls that you make to verify
specifications.
You can verify the following specifications for the NI PXI-5422:
• Oscillator frequency accuracy
• DC gain and offset accuracy
• AC accuracy
• Flatness
The verification procedure for each of these specifications includes setting up, programming,
and cleaning up.
Note If any of these tests fail immediately after you perform an external
adjustment, verify that you have met the required test conditions before you return
the NI PXI-5422 to NI for repair.
Refer to Table 2 for information about which instrument to use for verifying each specification.
Refer to Figure 3 for the names and locations of the NI PXI-5422 front panel connectors.

12 |ni.com |NI PXI-5422 Calibration Procedure
Figure 3. NI PXI-5422 Front Panel Connectors
Verifying the Oscillator Frequency Accuracy
This test verifies the frequency accuracy of the oscillator on the NI PXI-5422. The verification
involves generating a 10 MHz sine wave with the NI PXI-5422 and measuring the sine wave
frequency with one of the instruments from Table 2.
To verify the frequency accuracy of the oscillator on the NI PXI-5422, complete the following
steps:
1. Connect the NI PXI-5422 CH 0 front panel connector to the instrument measuring the
frequency accuracy with a male BNC-to-female SMB cable.
PFI 0
PFI 1
NI PXI-5422
16-Bit 200 MS/sAWG
ACCESS ACTIVE
CLK
IN
CH 0
DIGITAL DATA & CONTROL

NI PXI-5422 Calibration Procedure |© National Instruments |13
2. Call niFgen_init (niFgen Initialize VI) using the following parameters:
•resourceName: The name of the device that you want to verify. You can find this
name under Devices and Interfaces in MAX.
•IDQuery: VI_TRUE
•resetDevice: VI_TRUE
•vi: A pointer to a ViSession. The variable passed by reference through this parameter
receives the value that identifies the session created by this function. This value acts
as the session handle and is passed as the first parameter to all subsequent NI-FGEN
functions.
3. Call niFgen_SetAttributeViReal64 to set the sample rate (niFgen Set Sample Rate
VI) using the following parameters:
•vi: The session handle returned from niFgen_init
•channelName: "0"
•attributeID: NIFGEN_ATTR_ARB_SAMPLE_RATE
•value: 200000000
4. Call niFgen_SetAttributeViReal64 to set the gain (NI-FGEN Gain property) using
the following parameters:
•vi: The session handle returned from niFgen_init
•channelName: "0"
•attributeID: NIFGEN_ATTR_ARB_GAIN
•value: 1
Note You can adjust this value based on which measuring device you use.
5. Call niFgen_SetAttributeViReal64 to set the offset (NI-FGEN Offset property)
using the following parameters:
•vi: The session handle returned from niFgen_init
•channelName: "0"
•attributeID: NIFGEN_ATTR_ARB_OFFSET
•value: 0
Note You can adjust this value based on which measuring device you use.
6. Call niFgen_SetAttributeViBoolean to set the analog filter state (NI-FGEN
Analog Filter Enabled property) using the following parameters:
•vi: The session handle returned from niFgen_init
•channelName: "0"
•attributeID: NIFGEN_ATTR_ANALOG_FILTER_ENABLED
•value: VI_TRUE

14 |ni.com |NI PXI-5422 Calibration Procedure
7. Generate an array of waveform samples. The waveform should have 20 samples per cycle
with a total of 500 samples. This configuration results in 25 sine wave cycles. Because you
set the sample rate to 200 MS/s and are using 20 samples per cycle, the resulting waveform
is a 10 MHz sine wave.
Note The sample values of this waveform must fall between -1.0 and 1.0.
8. Call niFgen_CreateArbWaveform (niFgen Create Arbitrary Waveform VI) using the
following parameters:
•vi: The session handle returned from niFgen_init
•wfmSize: The size in samples (500) of the waveform you created in step 7.
•wfmData: The array of waveform samples that you created in step 7.
•wfmHandle: The variable passed by reference through this parameter receives the
value (waveform handle) that identifies the waveform created by this function.
9. Call niFgen_InitiateGeneration (niFgen Initiate Generation VI) to initiate the
waveform generation using the following parameter:
•vi: The session handle returned from niFgen_init
10. Measure the frequency output of the NI PXI-5422.
A frequency error of 45 Hz for a 10 MHz signal corresponds to an error of 4.5 ppm. This
limit accounts for the initial accuracy and the frequency deviation caused by temperature
and aging. Refer to Table 3 for frequency ranges.
11. Call niFgen_AbortGeneration (niFgen Abort Generation VI) to abort the waveform
generation using the following parameter:
•vi: The session handle returned from niFgen_init
12. Call niFgen_close (niFgen Close VI) to close the instrument driver session, to destroy
the instrument driver session and all of its properties, and to release any memory resources
NI-FGEN uses. Use the following parameter:
•vi: The session handle returned from niFgen_init
Table 3. Frequency Ranges
Calibration Test Limit Published Specifications ±25 ppm
Low High Low High
9,999,955 Hz 10,000,045 Hz 9,999,750 Hz 10,000,250 Hz

NI PXI-5422 Calibration Procedure |© National Instruments |15
Verifying the DC Gain and Offset Accuracy
This test verifies the DC gain and offset accuracy of the NI PXI-5422 into a high-impedance load
by generating a number of DC voltages and offsets, measuring the voltage with a DMM, and
comparing the NI PXI-5422 to the error limits.
The DC gain and offset accuracy verification procedure has three subprocedures that verify the
following:
• Main analog path gain
• Main analog path offset
• Direct analog path gain
Verifying the Main Analog Path Gain
To verify the gain of the NI PXI-5422 main analog path, complete the following steps:
1. Connect the NI PXI-5422 CH 0 front panel connector to the DMM for measuring DC gain
and offset accuracy.
2. Call niFgen_init (niFgen Initialize VI) using the following parameters:
•resourceName: The name of the device that you want to verify. You can find this
name under Devices and Interfaces in MAX.
•IDQuery: VI_TRUE
•resetDevice: VI_TRUE
•vi: A pointer to a ViSession. The variable passed by reference through this parameter
receives the value that identifies the session created by this function. This value acts
as the session handle and is passed as the first parameter to all subsequent Verifying
NI-FGEN functions.
3. Call niFgen_SetAttributeViBoolean to set the analog filter state (NI-FGEN
Analog Filter Enabled property) using the following parameters:
•vi: The session handle returned from niFgen_init
•channelName: "0"
•attributeID: NIFGEN_ATTR_ANALOG_FILTER_ENABLED
•value: VI_FALSE
4. Call niFgen_SetAttributeViReal64 to set the load impedance (NI-FGEN Load
Impedance property) using the following parameters:
•vi: The session handle returned from niFgen_init
•channelName: "0"
•attributeID: NIFGEN_ATTR_LOAD_IMPEDANCE
•value: 10000000000

16 |ni.com |NI PXI-5422 Calibration Procedure
5. Call niFgen_SetAttributeViInt32 to set the analog path (NI-FGEN Analog Path
property) using the following parameters:
•vi: The session handle returned from niFgen_init
•channelName: "0"
•attributeID: NIFGEN_ATTR_ANALOG_PATH
•value: NIFGEN_VAL_MAIN_ANALOG_PATH
6. Call niFgen_SetAttributeViReal64 to set the output impedance (NI-FGEN Output
Impedance property) using the following parameters:
•vi: The session handle returned from niFgen_init
•channelName: "0"
•attributeID: NIFGEN_ATTR_OUTPUT_IMPEDANCE
•value: 50
7. Call niFgen_SetAttributeViBoolean to enable the analog output (NI-FGEN Output
Enabled property) using the following parameters:
•vi: The session handle returned from niFgen_init
•channelName: "0"
•attributeID: NIFGEN_ATTR_OUTPUT_ENABLED
•value: VI_TRUE
8. Create an array of waveform samples for the positive full-scale DC waveform. This array
should contain 500 samples with each sample having the value 1.0 (representation:
double).
9. Call niFgen_CreateArbWaveform (niFgen Create Arbitrary Waveform VI) using the
following parameters:
•vi: The session handle returned from niFgen_init
•wfmSize: The size in samples (500) of the waveform you created in step 8.
•wfmData: The array of waveform samples that you created in step 8.
•wfmHandle: The variable passed by reference through this parameter receives the
value (waveform handle) that identifies the waveform created by this function
(positive full-scale handle).
10. Create an array of waveform samples for the negative full-scale DC waveform. This array
should contain 500 samples with each sample having the value -1.0 (representation:
double).

NI PXI-5422 Calibration Procedure |© National Instruments |17
11. Call niFgen_CreateArbWaveform (niFgen Create Arbitrary Waveform VI) using the
following parameters:
•vi: The session handle returned from niFgen_init
•wfmSize: The size in samples (500) of the waveform that you created in step 10.
•wfmData: The array of waveform samples that you created in step 10.
•wfmHandle: The variable passed by reference through this parameter receives the
value (waveform handle) that identifies the waveform created by this function
(negative full-scale handle).
12. Call niFgen_SetAttributeViReal64 to set the offset (NI-FGEN Offset property)
using the following parameters:
•vi: The session handle returned from niFgen_init
•channelName: "0"
•attributeID: NIFGEN_ATTR_ARB_OFFSET
•value: 0
13. Repeat steps 14 through 24 for each of the 24 iterations listed in Table 4, changing the Gain
value for each iteration. You can use Table 4 to record the results of these steps.

18 |ni.com |NI PXI-5422 Calibration Procedure
Table 4. Values for Verifying the Gain of the Main Analog Path
Iteration Gain
Ideal
Positive
Full-Scale
(Volts)
Ideal
Negative
Full-Scale
(Volts)
Measured
Positive
Full-Scale
(Volts)
Measured
Negative
Full-Scale
(Volts)
Error
Positive
Full-Scale
(Volts)*
Error
Negative
Full-Scale
(Volts)†
Calibration
Test Limit
(Volts)
Published
Specification
(Volts)
112.000000 12.000000 -12.000000 ±0.019700 ±0.048500
210.000000 10.000000 -10.000000 ±0.016500 ±0.040500
37.000000 7.000000 -7.000000 ±0.011700 ±0.028500
45.000000 5.000000 -5.000000 ±0.008500 ±0.020500
53.500000 3.500000 -3.500000 ±0.006100 ±0.014500
62.500000 2.500000 -2.500000 ±0.004500 ±0.010500
72.000000 2.000000 -2.000000 ±0.003700 ±0.008500
81.650000 1.650000 -1.650000 ±0.003140 ±0.007100
91.250000 1.250000 -1.250000 ±0.002500 ±0.005500
10 0.850000 0.850000 -0.850000 ±0.001860 ±0.003900
11 0.600000 0.600000 -0.600000 ±0.001460 ±0.002900
12 0.415000 0.415000 -0.415000 ±0.001164 ±0.002160
13 0.300000 0.300000 -0.300000 ±0.000980 ±0.001700
14 0.205000 0.205000 -0.205000 ±0.000828 ±0.001320
15 0.150000 0.150000 -0.150000 ±0.000740 ±0.001100
16 0.105000 0.105000 -0.105000 ±0.000668 ±0.000920

NI PXI-5422 Calibration Procedure |© National Instruments |19
17 0.075000 0.075000 -0.075000 ±0.000620 ±0.000800
18 0.055000 0.055000 -0.055000 ±0.000588 ±0.000720
19 0.037500 0.037500 -0.037500 ±0.000560 ±0.000650
20 0.026000 0.026000 -0.026000 ±0.000542 ±0.000604
21 0.018500 0.018500 -0.018500 ±0.000530 ±0.000574
22 0.013000 0.013000 - 0.013000 ±0.000521 ±0.000552
23 0.009000 0.009000 - 0.009000 ±0.000514 ±0.000536
24 0.006500 0.006500 -0.006500 ±0.000510 ±0.000526
*Error Positive Full-Scale Value = (Measured Positive Full-Scale Value) - (Ideal Positive Full-Scale Value)
†Error Negative Full-Scale Value = (Measured Negative Full-Scale Value) - (Ideal Negative Full-Scale Value)
Table 4. Values for Verifying the Gain of the Main Analog Path (Continued)
Iteration Gain
Ideal
Positive
Full-Scale
(Volts)
Ideal
Negative
Full-Scale
(Volts)
Measured
Positive
Full-Scale
(Volts)
Measured
Negative
Full-Scale
(Volts)
Error
Positive
Full-Scale
(Volts)*
Error
Negative
Full-Scale
(Volts)†
Calibration
Test Limit
(Volts)
Published
Specification
(Volts)