Keysight N9340B Manuale utente

Keysight Technologies

N9340B Handheld Spectrum Analyzer

Demo Guide

This demo guide is a tool for the new user to gain familiarity with the basic functions and features of

the Keysight Technologies, Inc. N9340B handheld spectrum analyzer.

Almost all exercises utilize a signal from an external signal generator with amplitude of –10 dBm and

frequency of 100 MHz.

Key names surrounded by [ ] indicate hardkeys located on the front panel, while key names surrounded

by { } indicate softkeys located on the right of the display.

Demos

1. Panel Tour

2. File Operation

3. Measurement Basics

4. Peak Search and Makers

5. Measuring Signal to Noise with Delta Markers

6. Improving Signal to Noise

7. Limit Lines and Pass/Fail Testing

8. Spectrogram

9. Tracking Generator

10. Power Meter Measurements

11. Field Strength Measurements

12. AM/FM, ASK/FSK Demodulation

13. Spectrum Emission Mask

14. Automation

Introduction

Section 1

Panel Tour

Caption Function

1Power switch Toggles the analyzer between on and off

2 Function keys Includes hardkeys: SYS, FREQ, SPAN, AMPTD, BW/SWP, TRACE, MEAS, and MODE

3 Preset Returns the analyzer to a known state, also turns on/off power save feature (press for 1 sec.)

4Enter Confirms a parameter selection or configuration

5ESC/CLR Exits and closes the dialog box or clears the character input

6MARKER Activates the marker functions

7LIMIT Sets limit lines for quick pass/fail testing

8 Save Quickly saves the current trace

9 Arrow keys Increases or decreases a parameter step by step

10 Knob Selects an option item or edits a numerical parameter

11 Softkeys Indicate current menu functions

12 Built-in light sensor Adjusts the display brightness automatically

13 Speaker Active when in demodulation mode

14 Screen Displays measured traces and status

14 12 10

1 2 3

13 11

Caption Function

1 External DC power connector Provides input for the DC power source via an AC-DC adapter or automotive type DC adapter.

2 LED indicator (charging) Light is {On} when the battery is charging

3 LED indicator Light is {On} when external DC power is connected to the tester

4USB interface (device) Connects the analyzer to a PC

5 USB interface (host) Connects the analyzer to a USB memory stick or disk

6Headphone Connects the analyzer to a headphone

7LAN interface Connects the analyzer to a PC for SCPI remote control

8 RF OUT connector The output for the built-in tracking generator. Enabled with Option TG3.

9 EXT TRIG IN/REF IN

(BNC, female)

Connects to an external TTL signal or a 10 MHz reference signal. The TTL signal is used to

trigger the analyzer’s internal sweep.

10 RF IN connector (50 Ω) Accepts an external input with a frequency range from 100 kHz to 3 GHz, tunable to 9 kHz

Section 1

Top Panel Overview

10 9 8

71 2 3 4 5 6

1. Adjust the display brightness

Instruction Key strokes

Switch the screen brightness state from

automatic to manual.

[SYS], {Brightness Man}

Rotate the knob to adjust the display

brightness.

Switch the screen brightness state back to

automatic.

[SYS], {Brightness Auto}

Cover the light sensor with your finger and

watch as the display brightness adjusts

automatically.

2. Backlit key demo

Instruction Key strokes

Switch the backlit key state to auto. [SYS], {KeyBackLight}

Cover the light sensor with your finger and

watch as the back lights come on.

Switch the backlit key state to manual,

and adjust the backlit keys’ brightness.

[SYS], {KeyBackLight}, {BackLight Man},

{Brightness}, {High} {Off} {Brightness},

{Med}

Set the automatic turn-off time interval so

the backlit keys will shut off when not in

operation.

[SYS], {KeyBackLight}, {AutoOffTimer}, {5

Sec}, {10 Sec}

Communication system maintenance and repair often requires a technician to

troubleshoot in bright daylight or in the dark. There is a light sensor on the front

panel of the N9340B that measures the ambient light and automatically adjusts

the brightness of the display and its backlit keys.

You can also manually set the brightness of the display, and the backlit keys, so

they can be seen clearly in any light. The duration of the key light can also be

set to maximize battery life.

Section 1

Auto-Brightness and Backlit Keys

A key feature of the Keysight N9340B Handheld spectrum analyzer is the

easy-to-use file system.

In addition to the 16 MB internal memory, the Keysight N9340B also allows you

to save files to an external USB memory device, such as a USB memory stick.

The analyzer has seven file types:

– CSV (*.CSV) Records the trace data as comma separated

variables.

– Pattern (*.PTN) Records the limit-line settings.

– Screen (*.JPG) Records the current screen.

– Setup (*.SET) Records the current system setting information.

– Spectrum Mask (*.MSK) Records spectrum mask settings.

– State (*.STA) Records the current controls and settings of the

analyzer.

– Trace (*.DAT) Records the data of the current trace and controls.

In this section, the state of the instrument is saved to a filename of your choice

so that it can be recalled for use in later sections.

Section 2

Save/Recall Setups and Results

1. Save a state file to the local memory

Instruction Key strokes

Call up the file save menu. [SYS]

Select the internal memory. [File], {File Setup}, {Save Path}, {Local}

Select the file type. {File Setup}, {File Type}, {State}

Enter the file name using numeric keypad. Enter a file name.

Save to the internal memory. {Save}

Keep the USB stick connected for the following operation.

Recalling a file from either the local memory or an external USB memory stick

is a simple task.

Here is an example:

3. Recall the state file you just saved in the USB memory stick.

Instruction Key strokes

Call up the file save menu. [SYS]

Select the load path. {File}, {View}, {USB}

Select the file type. {File Setup}, {File Type}, {State}

Rotate the knob to highlight the file.

Load the file. {Load now}

2. Save the state file to an external USB memory stick.

Instruction Key strokes

Insert a USB memory stick into the USB port

on the top panel of the analyzer.

Call up the file save menu. [SYS]

Select the save path. {File}, {File Setup} {Save Path}, {USB}

Select the file type. {File Setup}, {File Type}, {State}

Enter the file name using the numeric keypad

(using alphabet and/or number keys).

Enter a file name.

Save to the USB memory stick. {Save}

Section 2

Save/Recall Setups and Results (continued)

Section 3

Measurement Basics: Frequency, Span, Amplitude

The key measurement setup parameters of a spectrum analyzer are:

– Frequency: Adjusts the frequency.

– Span: Adjusts the difference between the start and stop

frequencies of the displayed spectrum.

– Amplitude: Adjusts the view of the signal level.

A typical spectrum analyzer measurement procedure contains the following

three steps:

1. First, the center frequency of the analyzer is tuned to the signal of interest.

2. Next, the span is adjusted to zoom in on the signal of interest.

3. Finally, the amplitude is adjusted to give the optimum view of the signal.

In this section, you will set an external signal generator to 100 MHz at –10 dBm

and connect an RF cable from its output port to the input port of the N9340B.

Software

If you do not have a signal generator, you can connect an antenna to the input

port of the N9340B and perform this demonstration using an ambient signal

such as from a local radio station. In this case you may need to jump ahead

to Section 6 to learn how to lower the noise floor by reducing the resolution

bandwidth (RBW).

Instruction Key strokes

Connect a Type-N RF cable from an external

signal generator’s RF output port to the RF

input connector of the N9340B.

Tune the center frequency to 100 MHz. [FREQ], [100], {MHz}

Adjust the span to zoom in on the signal on

the screen.

[Span], [10], {MHz}

Set the reference level so that the signal peak

is at the top graticule line.

[AMPTD], then rotate the knob.

Section 4

Peak Searching and Markers

The peak auto search feature of the analyzer allows you to measure multiple

peaks simultaneously. Not only does this save time, it also provides a clear

printout of frequency and amplitude data.

If you do not have a signal generator or this signal generator only generates one

peak, you can connect an antenna to the input port of the N9340B and perform

this demonstration using ambient signals, such as from several local radio

stations. In this case you may need to jump ahead to Section 6 to learn how to

lower the noise.

Instruction Key strokes

Connect the 100 MHz signal to the RF

IN connector. Set start frequency and

stop frequency.

[Preset], [FREQ] {Start Freq}, [90],

{MHz}, {Stop Freq}, [320], {MHz}

Activate auto peak search. [MARKER], {Peak Search}, {6 Peaks

Search {On}}

Figure 1. Marker peak search function

Section 5

Measuring Signal to Noise with Delta Markers

Harmonic distortion is present in any electronic system where a signal travels

through an active device. Communication engineers are extremely concerned

with harmonic distortion. For example, cellular radio systems must be checked

for harmonics of the carrier signal that might interfere with other systems

operating at the same frequencies as the harmonics.

In this section, the 100 MHz signal’s harmonics will be located using marker

delta. The marker delta function allows you to easily compare the frequency

and amplitude differences between two signals.

Note: Besides harmonics, you can also measure the amplitude ratio of any two signals present in dBc

using delta markers. The Marker Normal function lets you enter the exact frequency you want the

marker to go. The Delta Marker function lets you enter the exact frequency difference desired and

places the second marker at that point. The amplitude difference is shown in the upper right corner

of the display.

Instruction Key strokes

Set center frequency and span. [FREQ], {Center Freq}, [290], {MHz},

{SPAN}, [420], {MHz}

Place a marker at the highest peak on the

display (100 MHz).

[MARKER], {Peak Search}, {Return}

Anchor the first marker and activate a second

marker.

[MARKER], {Delta}

Move the second marker to another signal

peak by rotating the knob or entering the

frequency offset.

Rotate the knob, or press [100], {MHz}

Figure 2. Delta markers

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