Agilent Technologies X Series Manual de usuario

Agilent X-Series

Signal Analyzer

N9000A CXA Functional

Tests

This manual provides documentation for the

following X-Series Analyzer:

CXA Signal Analyzer N9000A

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Manual Part Number

N9000-90017

Supersedes:None

Print Date

August 2009

Printed in USA

Agilent Technologies, Inc.

1400 Fountaingrove Parkway

Santa Rosa, CA 95403

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Contents

Table of Contents

1. Functional Tests

Functional Test Versus Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Contents of this Document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Before Performing a Functional Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2. Displayed Average Noise Level (DANL)

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3. Frequency Readout Accuracy

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4. Second Harmonic Distortion (SHD)

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5. Amplitude Accuracy at 50 MHz

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Testing Preamp Option (P03, P07) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

6. Frequency Response (Flatness)

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7. Frequency Response (Flatness), Preamp On

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

8. Scale Fidelity

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Contents

Table of Contents

Functional Tests

1 Functional Tests

Functional tests are tests of various instrument parameters that give a high degree of confidence that the

analyzer is operating correctly. They are recommended as a check of analyzer operation for incoming

inspection or after a repair. Measurement uncertainty analysis is not available for functional tests, and the

analyzer is checked against limits that are wider than the published specifications. The functional tests

are designed to test an analyzer operating within the temperature range defined by the analyzer

specifications using a minimum set of test equipment. If a test does not pass, performance verification

tests must be run to determine whether a problem exists.

8 Chapter1

Functional Tests

Functional Test Versus Performance Verification

Functional Tests

Functional Test Versus Performance Verification

Functional tests use a minimum set of test equipment to check a much smaller range of parameters (and

a limited number of data points for each parameter) than do performance verification tests. Functional

tests use limits that are wider than the published specifications; measurement uncertainty analysis is not

available for functional tests.

NOTE If a functional test does not pass, you must run performance verification tests to

determine whether a problem exists.

Performance verification tests span a wide range of instrument parameters and provide the highest level

of confidence that the instrument conforms to published specifications. These tests can be time

consuming and require extensive test equipment.

Chapter 1 9

Functional Tests

Contents of this Document

Functional Tests

Contents of this Document

This chapter includes the following:

•“Before Performing a Functional Test” on page 10 (what to do first).

•“Test Equipment” on page 11 (a list of the equipment required for all of the tests).

Subsequent chapters describe the following Functional Tests:

•“Displayed Average Noise Level (DANL)” on page 15

•“Frequency Readout Accuracy” on page 19

•“Second Harmonic Distortion (SHD)” on page 21

•“Amplitude Accuracy at 50 MHz” on page 25

•“Frequency Response (Flatness)” on page 31

•“Frequency Response (Flatness), Preamp On” on page 35

•“Scale Fidelity” on page 39

Each functional test includes:

• Test limits (pass/fail criteria)

• A description of the test

• The equipment required for the test

• A figure showing how to connect the equipment

• Step-by-step instructions

• One or more tables in which to record the measurement results

10 Chapter1

Functional Tests

Before Performing a Functional Test

Functional Tests

Before Performing a Functional Test

1. Ensure that you have the proper test equipment.

2. Switch on the unit under test (UUT) and let it warm up (in accordance with warm-up requirements in

the instrument specifications).

3. Allow sufficient warm-up time for the required test equipment (refer to individual instrument

documentation for warm-up specifications).

4. Ensure that the analyzer’s frequency reference is set to Internal:

a. Press the Input/Output, More, Freq Ref In keys.

b. If the Freq Ref In softkey does not show Internal, press the Freq Ref In softkey and select Internal.

5. Following instrument warm-up, perform the auto align routine:

Press System, Alignments, Align Now, All.

NOTE Functional test accuracy depends on the precision of the test equipment used. Ensure that

all of the test equipment is calibrated before running a functional test.

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