Keysight Technologies V3500A Manuale utente

Keysight Technologies

V3500A Handheld RF

Power Meter

Demonstration

Guide

Contents

Introduction 2

Demonstration Preparation

• Average Power Measurement

• Average Pulse Power

Measurement

Conclusion 8

Ordering Information 8

Related Keysight Literature 8

Related Web Resources 8

Keysight’s First Handheld RF Power Meter

for Average Power Measurement

Conventional power measurements were performed using bench-top power

meters with power sensors and USB power sensors. These require external

power supply (115 V/230 V) and powered-up USB respectively. When

working in the outdoors or in the ﬁeld, external power supplies or PCs are not

available, so power measurement could not be carried out. Today, Keysight

Technologies, Inc. introduces its ﬁrst handheld RF power meter—V3500A,

which can be used in both outdoor and ﬁeld and research-and-development

(R&D) laboratory environments. The Keysight V3500A handheld RF power

meter is a low-cost solution for measuring average power with a frequency

range up to 6 GHz and a dynamic range up to 83 dB (+20 to -63 dBm), which

comes with a built-in LCD display.

This guide explains how to measure average power and average pulse power

using the V3500A. It also covers the key features of the V3500A that enable

you to optimize your measurement speed and accuracy.

Introduction

The Keysight V3500A handheld RF power meter is a compact handheld

instrument designed for making RF power measurements in both the ﬁeld

and in R&D laboratory environments. Its built-in power sensor eliminates the

need for users to carry both an instrument and a separate sensor module,

and the same sensor is used when duplicating tests or measurements for

better repeatability. To optimize ﬂexibility, the V3500A is capable of drawing

operating power from batteries, an AC-DC converter module, or a computer

via the USB interface. The Keysight 3500A handheld RF power meter is

suitable for a wide variety of RF measurement applications.

In the laboratory, the V3500A handheld RF power meter can be used as an RF

power data logger by transferring data through its built-in USB interface to a

computer, allowing for trend or drift analysis. It is ideal for production testing,

R&D or design-veriﬁcation applications.

For use in the ﬁeld, the compact size of the V3500A handheld RF power

meter allows it to be placed in a toolkit. Users do not have to carry both an

instrument and a separate sensor module (the V3500A has a built-in sensor).

The V3500A is ideal for installation and maintenance (I&M) or outdoor ﬁeld

(satellite or base station) applications.

Key Features

– Wideband frequency, 10 MHz to 6 GHz

for average RF power measurements.

– Large dynamic range of +20 dBm to

–63 dBm.

– Both sensor and display housed in the

same compact handheld package.

– Built-in LCD display allowing measure-

ment in a single-function unit.

– Universal Serial Bus (USB) control

interface.

– Flexibility of drawing operating power

from an on-board battery, an optional

external power supply, or a computer

via the USB interface.

– Internal power reference, enabling

self-calibration and eliminating the need

for the user to perform an independent

calibration before the instrument can

be used.

– Ability to compensate for cable losses

with the Relative Offset function that

can add an offset to the display ranging

between –99.99 dB and +99.99 dB.

This demonstration focuses on average power measurement and pulse power measurement.

Demonstration Preparation

The following instruments are used in this demonstration guide :

1. E44380 ESG Vector Signal Generator1

2. V3500A Handheld Power Meter

Required Option

–E4438C ﬁrmware revision:

C.04.98 or later.

–Frequency range option:

503 or 506.

–Baseband generator option:

601 or 602.

Required Option

–Standard option.

To download and update instrument

ﬁrmware and software, please visit:

–www.keysight.com/find/V3500A

— www.keysight.com/find/esg

— www.keysight.com/find/mxg

1. Alternatively, you can use the N5812A MXG vector signal generator to generate the CW or pulse signal.

Connecting the ESG and V3500A instruction:

Connect the ESG and V3500A as shown in Figure 1.

Figure 1. ESG signal generator and V3500A handheld power meter setup diagram

E44380 ESG Vector Signal Generator V3500A Handheld Power Meter

Average Power Measurement Demonstration

Objective

To demonstrate the capability of the V3500A handheld power meter for average power measurement.

Note:

Keystrokes surrounded by [ ] represent front-panel keys of the instrument.

Keystrokes surrounded by {}represent softkeys of the instrument.

Instructions Keystrokes

On the ESG :

1. Turn on the ESG. Press []standby button to “ON” (green LED light displays).

2. Set the instrument to its

default setting.

Press [Preset].

3. Set the frequency and

amplitude.

Press [Frequency] 1000 MHz.

Press [Amplitude] 0 dBm.

4. Turn ON the RF Output. Toggle [RF On/Off] to “ON”.

Instructions Keystrokes

On the V3500A :

1. Turn on the V3500A. Press [] ON/OFF button to turn on V3500A.

2. Set the frequency to 1000 MHz. Press [ ] OR [ ] to change frequency to 1000 MHz.

3. Set the average count to 4.

Press [] button to enter menu mode.

Press [ ] or [ ] until “Averaging mode” menu is displayed.

Press [ ] or [ ] to increase averaging count to <4>.

Press [ ] button to exit.

Average Power Measurement Demonstration (continued)

Instructions Keystrokes

On the V3500A :

4. Save the instrument state.

Press [] button to enter menu mode.

Press [ ] or [ ]until “SAVE STATE” menu is displayed.

Press [ ] or [ ] to select <Save> mode.

Note : Saving the state of the instrument places all menu values in the memory of the unit so that they can be recalled

after power cycling. Frequency settings are not saved or recalled.

The “Save State” feature is only functional when the batteries are stored in the instrument.

5. Read the measurement. The measurement, 0.01 dBm displayed at left-hand corner of the display.

Note : The top line of the display shows the measured power of the signal. The measured power will be updated

continuously and displayed accordingly. In the upper right- hand corner of the display, an “at” symbol (@) is displayed

whenever a new measurement is completed and the results have been displayed.

Zeroing the Sensor

The zeroing function is used to zero the V3500A handheld power meter. When [ ]

is pressed, the V3500A handheld power meter measures the offset voltages in the

signal path and zeroes the power meter. This allows a more accurate measurement at

low power levels. The V3500A RF input may be left disconnected when it is zeroed, or

it may be connected to other hardware, but make sure that no signals are present on

the RF input (inaccurate readings will result). For example, if the V3500A is connected

to a signal generator, turn off the signal generator’s output before pressing the

zero key. When the V3500A is zeroed, the display will show “ZEROING.” The entire

operation takes approximately 30 seconds.

Average Pulse Power Measurement Demonstration

Pulse power is determined by measuring the average power of the pulse and then dividing the measurement results by

the pulse-cycle value to obtain the pulse power reading, as expressed by the following equation:

Power

B (Pulse Repetition Interval)

Measured

Average Power

Time

A (Pulse Width)

Duty Cycle A

Figure 2. Pulse power calculation

The measurement result is a

mathematical representation of the

pulse power rather than the actual

measurement with the assumption

of constant peak power. To ensure

accurate pulse power readings, the

input signal must be a repetitive

rectangular pulse with a constant

duty cycle.

There are some advantages to using

duty cycle to calculate the pulse

power. The duty-cycle technique

provides the lowest-cost solution,

with average power meters and

sensors being less expensive than

peak and average power meters and

sensors. Average power meters also

have the ability to measure over a

wide power and frequency range.

In this demonstration, we are

supplying a pulsed signal with the

pulse width of 20 μs and a pulse

period or pulse repetition interval

(PRI) of 40 μs. The pulse signal is set

to the power level of approximately

0 dBm. (See Figure 3).

Using a V3500A handheld power

meter to measure the average power

of the signal, the measurement result

is –3.04 dBm. We can see from

the results that the average power

over the full PRI is –3.04 dBm lower

than the pulse itself. The measured

value is therefore very close to

the calculated –3.01 dB difference

provided by the duty-cycle method,

which was for the ‘perfect’ pulse

shape.

Average Power Δ = 10 log DC

= 10 log (20 µ/

40 µ)

= 10 log 0.5

= –3.01 dB

Pulse Width

(PW)

Pulse Repetition Interval (PRI) = 40 µs

Figure 3. Measuring pulse power using duty cycle

Pavg

Pp= Duty Cycle

in linear term. (See Figure 2)

Objective

To demonstrate the capability of the V3500A handheld power meter for average pulse power measurement.

Instructions Keystrokes

On the ESG :

1. Set the instrument to its default

setting.

Press [Preset].

2. Set the frequency and

amplitude.

Press [Frequency] 1000 MHz.

Press [Amplitude] 0 dBm.

3. Set the pulse signal. Press [Pulse], {Pulse Period} 40 µs and {Pulse Width} 20 µs.

4. Activate the pulse signal. Toggle {Pulse On/Off} to “ON”.

5. Turn ON the RF Output Toggle [RF On/Off] to “ON”.

Instructions Keystrokes

On the V3500A :

1. Turn on the V3500A. Press [] ON/OFF button to turn on the V3500A.

2. Set the frequency to 1000 MHz. Press [ ] OR [ ] to change frequency to 1000 MHz.

3. Set the average count to 4.

Press [] button to enter menu mode.

Press []or [ ] until “Averaging mode” menu is displayed.

Press [] or [ ] to increase averaging count to <4>.

Press []button to exit.

4. Read the measurement. Press [ ] to exit menu. The measurement, –3.04 dBm displayed at left

hand corner of the display.

Conclusion

The Keysight V3500A RF Handheld power meter provides accurate average power measurement as well as average

pulse power measurement, as demonstrated in this document. The V3500A handheld power meter also provides the

following features when performing outdoor (satellite or base station) power measurement:

–Both sensor and display housed in a compact handheld package.

–Wideband up to 6 GHz average RF power measurement.

–Easy-to-use interface with LCD display.

–Flexibility of drawing operating power from an on-board battery.

Ordering Information

Product Type Model Number

Handheld RF Power Meter V3500A

Power supply V3500A-PWR

Holster carrying case with shoulder strap V3500A-SHL

USB interface cable (Standard-A to Type-B), 2.5 meter V3500A-CA1

Related Keysight Literature

Publication Title Publication number

Keysight V3500A Handheld RF Power Meter User’s Guide V3500-90001

Keysight V3500A Handheld RF Power Meter, Data Sheet 5990-5483EN

Related Web Resources

For the latest and most complete applications and information, please refer to the following URL:

www.keysight.com/nd/V3500A

For more information on Keysight

Technologies’ products, applications or

services, please contact your local Keysight

office. The complete list is available at:

www.keysight.com/find/contactus

Americas

Canada (877) 894 4414

Brazil 55 11 3351 7010

Mexico 001 800 254 2440

United States (800) 829 4444

Asia Pacic

Australia 1 800 629 485

China 800 810 0189

Hong Kong 800 938 693

India 1 800 112 929

Japan 0120 (421) 345

Korea 080 769 0800

Malaysia 1 800 888 848

Singapore 1 800 375 8100

Taiwan 0800 047 866

Other AP Countries (65) 6375 8100

Europe & Middle East

Austria 0800 001122

Belgium 0800 58580

Finland 0800 523252

France 0805 980333

Germany 0800 6270999

Ireland 1800 832700

Israel 1 809 343051

Italy 800 599100

Luxembourg +32 800 58580

Netherlands 0800 0233200

Russia 8800 5009286

Spain 0800 000154

Sweden 0200 882255

Switzerland 0800 805353

Opt. 1 (DE)

Opt. 2 (FR)

Opt. 3 (IT)

United Kingdom 0800 0260637

For other unlisted countries:

www.keysight.com/find/contactus

(BP-07-10-14)

This information is subject to change without notice.

Published in USA, July 31, 2014

5990-5571EN

www.keysight.com

09 | Keysight | V3500A Handheld RF Power Meter – Demonstration Guide

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AdvancedTCA®Extensions for Instrumentation and Test (AXIe) is an

open standard that extends the AdvancedTCA for general purpose and

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ATCA®, AdvancedTCA®, and the ATCA logo are registered US trademarks of

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consortium.

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rugged, PC-based high-performance measurement and automation system.

Three-Year Warranty

www.keysight.com/find/ThreeYearWarranty

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of ownership. The only test and measurement company with three-year

warranty standard on all instruments, worldwide.

Keysight Assurance Plans

www.keysight.com/find/AssurancePlans

Up to five years of protection and no budgetary surprises to ensure your

instruments are operating to specification so you can rely on accurate

measurements.

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DEKRA Certified ISO 9001:2008

Quality Management System

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Get the best of both worlds: Keysight’s measurement expertise and product

breadth, combined with channel partner convenience.

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