National Instruments NI PXI-5122 Handbuch

CALIBRATION PROCEDURE

NI 5122/5124/5142

This document contains information for calibrating NI 5122/5124/5142 high-speed digitizers.

For more information on calibration, visit ni.com/calibration.

Contents

Software Requirements............................................................................................................. 1

Documentation Requirements .................................................................................................. 2

Password .................................................................................................................................. 2

Calibration Interval................................................................................................................... 3

Test Equipment......................................................................................................................... 3

Test Conditions......................................................................................................................... 3

Calibration Procedures ............................................................................................................. 4

Initial Setup....................................................................................................................... 4

Self-Calibration ................................................................................................................4

MAX......................................................................................................................... 4

NI-SCOPE Soft Front Panel ..................................................................................... 5

NI-SCOPE ................................................................................................................ 5

Verification ....................................................................................................................... 5

Vertical Offset and Vertical Gain Accuracy............................................................. 6

Programmable Vertical Offset Accuracy ................................................................. 17

Timing Accuracy ...................................................................................................... 22

Bandwidth and Flatness............................................................................................ 26

Trigger Sensitivity .................................................................................................... 34

Adjustment........................................................................................................................ 39

Appendix A: Calibration Options............................................................................................. 42

Complete Calibration........................................................................................................ 43

Optional Calibration ......................................................................................................... 43

Appendix B: Calibration Utilities............................................................................................. 45

MAX................................................................................................................................. 45

NI-SCOPE ........................................................................................................................45

Worldwide Support and Services ............................................................................................. 45

Software Requirements

Calibrating the NI 5122/5124/5142 requires installing NI-SCOPE on the calibration system.

Refer to Table 1 for the hardware-specific version to use with your device. You can download

the NI-SCOPE instrument driver from the Instrument Driver Network Web site at ni.com/

idnet. NI-SCOPE supports programming a Self-Calibration and an External Calibration in the

LabVIEW and C application development environments (ADEs). When you install NI- SCOPE,

you only need to install support for the ADE that you intend to use.

2|ni.com |NI 5122/5124/5142 Calibration Procedure

LabVIEW support is in the niScopeCal.llb file, and all calibration functions appear in the

NI-SCOPE Calibration palette. For LabWindows™/CVI™ users, the NI -SCOPE function panel

niScopeCal.fp provides access to the available functions.

For the locations of files you may need to calibrate your device, refer to the NI High-Speed

Digitizers Help, which is available on the NI-SCOPE DVD and from ni.com/manuals.

Documentation Requirements

For information about NI-SCOPE and the NI 5122/5124/5142, you can consult the following

documents:

•NI High-Speed Digitizers Getting Started Guide—provides instructions for installing and

configuring the digitizer.

•NI High-Speed Digitizers Help—includes detailed information about the digitizer and

NI-SCOPE VIs and functions.

•NI PXI/PXIe/PCI-5122 Specifications, NI PXI/PCI-5142 Specifications, or

NI PXI/PCI-5124 Specifications—includes detailed information about the digitizer and

provides the published specification values. Refer to the most recent specifications

documents online at ni.com/manuals.

• NI-SCOPE programming references—includes information about creating applications

using LabVIEW, C/C++, or CVI. These references are located within the NI High-Speed

Digitizers Help.

These documents are installed with NI-SCOPE. You also can find the latest versions of the

documentation at ni.com/manuals.

Password

The default calibration password is NI.

Table 1. Required Software for NI 5122/5124/5142 Calibration

Device NI-SCOPE Version

NI PXI-5122 2.5 or later

NI PCI-5122 2.6 or later

NI PXIe-5122 3.3.1 or later

NI PXI/PCI-5124 2.7 or later

NI PXI/PCI-5142 3.0 or later

NI 5122/5124/5142 Calibration Procedure |© National Instruments |3

Calibration Interval

National Instruments recommends a minimum calibration interval of two years for the

NI 5122/5124/5142. You should adjust the recommended calibration interval based on the

measurement accuracy demands of your application.

Test Equipment

National Instruments recommends that you use the equipment in Table 2 for calibrating the

NI 5122/5124/5142.

Note The delay times indicated in this procedure apply specifically to the Fluke

9500B calibrator. If you use a different calibrator, you may need to adjust these delay

times.

Test Conditions

Follow these guidelines to optimize the equipment and the environment during calibration:

• Always connect the calibrator test head directly to the input BNC of the digitizer, or use a

short 50 ΩBNC coaxial cable if necessary. Long cables and wires act as antennae, picking

up extra noise that can affect measurements.

• Verify that all connections to the device, including front panel connections, are secure.

• Maintain an ambient temperature of 23 ±5 °C. The device temperature will be greater than

the ambient temperature.

• Keep relative humidity below 80%.

Table 2. Test Equipment

Equipment

Recommended

Model

Parameter

Measured Requirements

Signal generator Fluke 9500B

oscilloscope

calibrator

Wavetek 9500 with

high-stability

reference option

Fluke 9510 test

head

DC Accuracy DC ±(0.025% + 25 μV)

into 1 MΩor 50 Ω

Bandwidth, trigger

sensitivity

±2% output amplitude

flatness for leveled sine

wave up to 150 MHz

relative to 50 kHz into

1MΩor 50 Ω

Timing Accuracy ±2 ppm frequency

accuracy

BNC cable — — 50 Ω

4|ni.com |NI 5122/5124/5142 Calibration Procedure

• Allow a warm-up time of at least 15 minutes to ensure that the measurement circuitry is at

a stable operating temperature. Unless manually disabled, the NI-SCOPE driver

automatically loads with the operating system and enables the device. This warm-up time

ensures the digitizer is at a stable operating temperature.

• Ensure that the PXI/PXIe chassis fan speed is set to HIGH, that the fan filters are clean, and

that the empty slots contain filler panels. For more information, refer to the Maintain

Forced-Air Cooling Note to Users document available at ni.com/manuals.

• Plug the chassis/PC and the calibrator into the same power strip to avoid ground loops.

Calibration Procedures

The calibration process includes the following steps:

1. Initial Setup—Install the device and configure it in Measurement & Automation Explorer

(MAX).

2. Self-Calibration—Adjust the self-calibration constants of the device.

3. Verification—Verify the existing operation of the device. This step confirms whether the

device is operating within the published specifications prior to adjustment.

4. Adjustment—Perform an external adjustment of the device that adjusts the calibration

constants of the device. The adjustment procedure automatically stores the calibration date

on the EEPROM to allow traceability.

5. Reverification—Repeat the Verification procedure to ensure that the device is operating

within the published specifications after adjustment.

These procedures are described in more detail in the following sections.

Initial Setup

Refer to the NI High-Speed Digitizers Getting Started Guide for information about how to install

the software and hardware and how to configure the device in MAX.

Self-Calibration

The NI 5122/5124/5142 includes precise internal circuits and references used during

self-calibration to adjust for any errors caused by short-term fluctuations in the environment.

Note Allow a 15-minute warm-up period before you begin self-calibration.

Self-calibration can be initiated from MAX, NI-SCOPE Soft Front Panel (SFP), and NI-SCOPE.

MAX

To initiate self-calibration from MAX, complete the following steps:

1. Disconnect or disable any AC inputs to the digitizer.

2. Launch MAX.

3. Select My System»Devices and Interfaces.

NI 5122/5124/5142 Calibration Procedure |© National Instruments |5

4. Select the device that you want to calibrate.

5. Initiate self-calibration in one of the following ways:

•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.

NI-SCOPE Soft Front Panel

To initiate self-calibration from the SCOPE SFP, complete the following steps:

1. Disconnect or disable any AC inputs to the digitizer.

2. Launch the NI-SCOPE SFP.

3. Select the device you want to calibrate using the Device Configuration dialog box by

selecting Edit»Device Configuration.

4. Launch the Calibration dialog box by selecting Utility»Self Calibration.

5. Click OK to begin self-calibration.

NI-SCOPE

To self-calibrate the digitizer programmatically using NI-SCOPE, complete the following steps:

1. Disconnect or disable all AC inputs to the digitizer.

2. Open a session and obtain a session handle using the niScope Initialize VI.

3. Self-calibrate the digitizer using niScope Cal Self Calibrate VI.

4. End the session using the niScope Close VI.

Verification

Note After the 15-minute warm-up time, always self-calibrate the digitizer before

beginning a verification procedure.

This section describes the program you must write to verify either the calibration test limits or

the published specifications for the digitizer. Refer to Appendix A: Calibration Options to

determine which limits to use in these procedures.

Note If any of these tests fail immediately after you perform an external

adjustment, make sure that you have met the requirements listed in the Test

Equipment and Test Conditions sections before you return the digitizer to National

Instruments for repair.

6|ni.com |NI 5122/5124/5142 Calibration Procedure

Vertical Offset and Vertical Gain Accuracy

Table 3 contains the input parameters for verifying both vertical offset accuracy and vertical

gain accuracy of the digitizer.

To verify vertical offset accuracy, complete the procedures described in the Vertical Offset

Accuracy section for each of the 39 iterations in Table 3 for channel 0, then repeat the procedures

for channel 1. The Calibration Test Limits and Published Specifications for vertical offset

accuracy are shown in Table 4 (NI 5122), Table 5 (NI 5124), and Table 6 (NI 5142).

To verify vertical gain accuracy, complete the procedures described in the Vertical Gain

Accuracy section for each of the 39 iterations in Table 3 for channel 0, then repeat the procedures

for channel 1. The Calibration Test Limits and Published Specifications for vertical gain

accuracy are shown in Table 7 (NI 5122/5142) and Table 8 (NI 5124).

Table 3. NI 5122/5124/5142 Input Parameters for Vertical Offset Accuracy

and Vertical Gain Accuracy Verification

Iteration

Input

Impedance

Max Input Frequency (Hz)

RangeNI 5122/5142 NI 5124

1 50 Ω100,000,000 150,000,000 0.2

2 50 Ω100,000,000 150,000,000 0.4

3 50 Ω100,000,000 150,000,000 1

4 50 Ω100,000,000 150,000,000 2

5 50 Ω100,000,000 150,000,000 4

6 50 Ω100,000,000 150,000,000 10

7 50 Ω35,000,000 60,000,000 0.2

8 50 Ω35,000,000 60,000,000 0.4

9 50 Ω35,000,000 60,000,000 1

10 50 Ω35,000,000 60,000,000 2

11 50 Ω35,000,000 60,000,000 4

12 50 Ω35,000,000 60,000,000 10

13 50 Ω20,000,000 20,000,000 0.2

14 50 Ω20,000,000 20,000,000 0.4

15 50 Ω20,000,000 20,000,000 1

16 50 Ω20,000,000 20,000,000 2

17 50 Ω20,000,000 20,000,000 4

NI 5122/5124/5142 Calibration Procedure |© National Instruments |7

18 50 Ω20,000,000 20,000,000 10

19 1MΩ100,000,000 150,000,000 0.2

20 1MΩ100,000,000 150,000,000 0.4

21 1MΩ100,000,000 150,000,000 1

22 1MΩ100,000,000 150,000,000 2

23 1MΩ100,000,000 150,000,000 4

24 1MΩ100,000,000 150,000,000 10

25 1MΩ100,000,000 150,000,000 20

26 1MΩ35,000,000 60,000,000 0.2

27 1MΩ35,000,000 60,000,000 0.4

28 1MΩ35,000,000 60,000,000 1

29 1MΩ35,000,000 60,000,000 2

30 1MΩ35,000,000 60,000,000 4

31 1MΩ35,000,000 60,000,000 10

32 1MΩ35,000,000 60,000,000 20

33 1MΩ20,000,000 20,000,000 0.2

34 1MΩ20,000,000 20,000,000 0.4

35 1MΩ20,000,000 20,000,000 1

36 1MΩ20,000,000 20,000,000 2

37 1MΩ20,000,000 20,000,000 4

38 1MΩ20,000,000 20,000,000 10

39 1MΩ20,000,000 20,000,000 20

Table 3. NI 5122/5124/5142 Input Parameters for Vertical Offset Accuracy

and Vertical Gain Accuracy Verification (Continued)

Iteration

Input

Impedance

Max Input Frequency (Hz)

RangeNI 5122/5142 NI 5124

8|ni.com |NI 5122/5124/5142 Calibration Procedure

Vertical Offset Accuracy

Complete the following steps to verify vertical offset accuracy of the NI 5122/5124/5142. You

must verify both channels with each iteration in Table 3.

1. Open a session and obtain a session handle using the niScope Initialize VI.

Note Throughout the procedure, refer to the C/C++ function call parameters for the

LabVIEW input values.

2. Configure the input impedance and the maximum input frequency using the

niScope Configure Chan Characteristics VI.

3. Configure the common vertical properties using the niScope Configure Vertical VI.

LabVIEW VI C/C++ Function Call

Call niScope_init with the

following parameters:

resourceName: The device name

assigned by MAX

idQuery: VI_FALSE

resetDevice: VI_TRUE

LabVIEW VI C/C++ Function Call

Call

niScope_ConfigureChan

Characteristics with the

following parameters:

vi: The instrument handle from

niScope_init

channelList: "0"

inputImpedance: The Input

Impedance value in Table 3 for

the current iteration

maxInputFrequency: The

Maximum Input Frequency

value in Table 3 for the current

iteration

NI 5122/5124/5142 Calibration Procedure |© National Instruments |9

4. Configure the horizontal properties using the niScope Configure Horizontal Timing VI.

5. Commit all the parameter settings to hardware using the niScope Commit VI.

LabVIEW VI C/C++ Function Call

Call

niScope_ConfigureVerti

cal with the following

parameters:

coupling: NISCOPE_VAL_DC

probeAttenuation: 1.0

vi: The instrument handle from

niScope_init

channelList: "0"

range: The Range value in

Table 3 for the current iteration

offset: 0.0

enabled:

NISCOPE_VAL_TRUE

LabVIEW VI C/C++ Function Call

Call niScope_Configure

HorizontalTiming with the

following parameters:

enforceRealtime:

NISCOPE_VAL_TRUE

numRecords: 1

vi: The instrument handle from

niScope_init

minSampleRate: 10,000,000

refPosition: 50.0

minNumPts: 100,000

LabVIEW VI C/C++ Function Call

Call niScope_Commit with the

following parameter:

vi: The instrument handle from

niScope_init

10 |ni.com |NI 5122/5124/5142 Calibration Procedure

6. Short-circuit the channel 0 input of the digitizer by connecting the calibrator test head

directly to the digitizer and grounding the output of the calibrator.

7. Wait 500 ms for the calibrator to ground its output.

8. Initiate a waveform acquisition using the niScope Initiate Acquisition VI.

9. Fetch a waveform from the digitizer and perform a voltage average measurement using the

niScope Fetch Measurement (poly) VI. Select the Measurement Scalar DBL instance of

the VI.

Compare the resulting average voltage to the value listed in the Calibration Test Limits

column or the Published Specifications column in Table 4 (NI 5122), Table 5 (NI 5124), or

Table 6 (NI 5142) that corresponds to the vertical range used.

Note The inputImpedance and maxInputFrequency do not affect the test limit

value.

If the result is within the selected test limit, the device has passed this portion of the

verification.

10. Repeat steps 2 through 9 for each iteration in Table 3.

11. Move the calibrator test head to the digitizer input channel 1 and repeat steps 2 through 10

for every configuration in Table 3, changing the value of the channelList parameter from

"0" to "1".

LabVIEW VI C/C++ Function Call

Call niScope_Initiate

Acquisition with the

following parameter:

vi: The instrument handle from

niScope_init

LabVIEW VI C/C++ Function Call

Call niScope_Fetch

Measurement with the

following parameters:

timeout: 1.0

vi: The instrument handle from

niScope_init

channelList: "0"

scalarMeasFunction:

NISCOPE_VAL_VOLTAGE_

AVERAGE

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