Keysight Technologies U2000 Series Manuale utente

Keysight Technologies

N1918A Power Analysis Manager

and U2000 Series USB Power Sensors

Demo Guide

Introduction

This demonstration guide helps you to get familiar with the basic setup

and conguration requirements to perform power measurements using

the Keysight Technologies, Inc. U2000 Series USB power sensor via

Keysight N1918A Power Analysis Manager.

All demonstrations exercised in this guide require the U2000 Series bundled

application software N1918A Power Analysis Manager–Power Panel, any of

the U2000 Series USB power sensors and a Keysight ESG E4438C vector

signal generator.

This demonstration guide includes a step-by-step demonstration of basic

average and pulse measurements.

03 | Keysight | N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide

U2000 Series USB Power Sensors

The U2000 Series USB power sensors are average, wide dynamic range power

sensors that can be used with a PC or any selected Keysight USB-based instrument.

Key Features

– Performs power measurements without a power meter

– Offers a frequency range of 9 kHz to 24 GHz (sensor-dependent)

– Provides a dynamic range from –60 dBm to +44 dBm

– Offers internal zeroing capability and external calibration-free measurements

– Allow average power measurement of CW and modulated signals, including

GSM, EDGE, WLAN and WIMAXTM

Figure 2. U2000 Series USB power sensor

Figure 1. Power Panel View – graphical user interface and functions

Power Panel

The Power Panel is the basic version of the Power Analysis Manager and is bundled

with the purchase of a U2000 Series USB power sensor. The Power Panel provides an

easy-to-use GUI that offers basic features that can be found in a typical power meter.

Key Features

– Processes and displays multi-channel power measurements (with more than

10 channels simultaneously)

– Provides larger, enhanced visual display, including power versus time graph

(trend chart)

– Performs delta and ratio computations between data from two channels

– Saves and restores instrument settings

– Stores up to 10,000 measurement points

– Stores data in comma separated value (CSV) les that are compatible with

Microsoft Excel

– Provides up to 10 frequency dependent offset (FDO) tables

– Supports time-gated measurement capability

save image le

disconnect instrument

connect instrument

Menu bar

Toolbar

Instrument Navigator panel

Instrument Properties tab

Gauge View

Multi List View

Soft Panel View

start measurements

stop measurements

create Soft Panel

create Gauge

create Strip Chart

remove view

preset

save instrument settings

load instrument settings

save instrument screen

unlock local access

show error list

reset instruments

FDO table

Instrument Properties toolbar

duty cycle (%)

input frequency in MHz

channel offset (dB)

04 | Keysight | N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide

Demonstration Preparation

The following instruments and software are required in order to perform the

demonstrations illustrated in this demo guide:

– Keysight N1918A Power Analysis Manager (Power Panel)

– Keysight U2000 Series USB Power Sensors

– Keysight IO Libraries Suite

– Keysight ESG E4438C Vector Signal Generator

Product type Description

N1918A Power Analysis Manager Power Panel—Basic version

Keysight U2000 Series USB Power Sensors Any of the USB sensors—U200xA/B/H Series

Keysight ESG E4438C Vector Signal Generator E4438C rmware revision C.04.60 or later

Keysight Automation-Ready CD Keysight IO Libraries Suite 14.2 or higher

In this guide, keystrokes surrounded by [ ] represent instrument front panel keys.

Connecting and Verifying ESG and U2000 Series USB

Power Sensors

Instructions

1. Connect the USB sensor to a PC that runs the Power Analysis

Manager and the Keysight IO Libraries Suite 14.2 or higher

using the USB mini-B connector.

2. Connect the other end of the USB sensor to the ESG as shown

in Figure 3.

3. Go to Start > All Programs > Keysight IO Libraries Suite >

Keysight Connection Expert to launch the Keysight Connection

Expert application.

4. Detect and verify all connected instruments to ensure suc-

cessful connections have been established. Right-click on

each listed instrument in the Keysight Connection Expert and

send the standard *IDN? command to the instrument for

identication.

5. Once all connected instruments have been successfully veried,

launch the Power Panel to begin. Go to Start > All Programs >

Keysight N1918A Power Analysis Manager > Power Panel.

6. To start using the Power Panel, search for a connected

instrument using the options available in the Find Connected

Instrument panel.

7. Click Find to search for a connected instrument via the sup-

ported IO connectivity—GPIB, LAN, or USB options.

8. Select the USB sensor and click Connect. The Power Panel

is ready to use.

9. Select the USB sensor on the Instrument Navigator panel.

On the Instrument Properties panel, click Zero to perform

zeroing on the USB sensor.

For more information on the Power Panel installation, system

requirements, setup, and usage, visit www.keysight.com/nd/N1918A.

Figure 3. PC, ESG and USB power sensor conguration diagram

Connecting U2000

Series USB sensor to

PC using USB mini-B

connector

RF Out

05 | Keysight | N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide

Average Power Measurement Demonstration

Objective

To demonstrate the capability of the Power Panel to carry out average power

measurement using the U2000 Series USB power sensor.

Instructions

On the ESG

1. Set the instrument to default Press [Preset]

2. Set the frequency and amplitude 1. Press [Frequency] 1900 > MHz

2. Press [Amplitude] 0 > dBm

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

In the Power Panel

1. Set the frequency 1. Click Channel on the Instrument

Navigator panel.

2. Set Frequency (Hz) to “1.900 G” on the

Instrument Properties panel.

2. Start the measurement

(See Figure 4)

Click on the Power Panel toolbar.

Figure 4. Setting the properties in the Power Panel for average power measurements using USB power sensor

06 | Keysight | N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide

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:

Pp= Pavg / Duty Cycle

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.

Objective

To demonstrate the capability of the Power Panel to carry out pulse power measure-

ment using the U2000 Series USB power sensor.

In this demonstration, we supplying a pulsed signal with the pulse width of 10 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. The measured average power of the signal is

–6.24 dBm (See Figure 6). The duty cycle is known to be 10 μs divided by 40 μs, which

is 25%—this value can be congured in the Power Panel. This generates a pulse reading

of –0.22 dBm (See Figure 7).

To understand what the USB power sensor does, we can look at the duty cycle calcula-

tion. The equation, Average Power = 10 log (Pulse Width/PRI), provides the difference

between average power and pulse power. The calculated value in this demonstration

shows that the average power is –6.02 dBm lower than the pulse power. The Power

Panel makes this correction to show the pulse power using the provided duty cycle.

Instructions

On the ESG

1. Set the instrument to default Press [Preset]

2. Set the frequency and amplitude 1. Press [Frequency] 1900 > MHz

2. Press [Amplitude] 0 > dBm

3. Set the pulse signal 1. Press [Pulse] Pulse Period > 40 > usec

2. Pulse Width > 10 > usec

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

Power

Time

A (Pulse Width)

B (Pulse Repetition Interval)

Measured

Average Power

Duty Cycle = A

Figure 5. Pulse power calculation

07 | Keysight | N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide

Instructions

In the Power Panel

1. Set the frequency 1. Click Channel on the Instrument Navigator panel.

2. Set Frequency (Hz) to “1.900 G” on the Instrument

Properties panel.

2. Acquire average power measurement

(See Figure 6)

Click on the Power Panel toolbar.

3. Stop the power measurement Click the Stop button on the Power Panel toolbar.

4. Enable and set the duty cycle to 25% 1. Click Channel on the Instrument Navigator panel.

2. Select Duty Cycle checkbox.

3. Set the Duty Cycle (%) to “25.000”.

5. Start the measurement

(See Figure 7)

Click on the Power Panel toolbar.

Figure 7. Pulse power measurement with duty cycle value set to 25%

Figure 6. Average power measurement of pulse signal

08 | Keysight | N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide

Instructions

On the ESG

1. Set the instrument to default Press [Preset]

2. Set the frequency and amplitude 1. Press [Frequency] 900 > MHz

2. Press [Amplitude] 0 > dBm

3. Set GSM signal 1. Press [Mode], {Real Time TDMA}, {GSM}.

2. Toggle {GSM} to “On”.

3. Press {Data Format Framed}.

4. Turn off the Timeslot #0 1. Press {Congure Timeslot}.

2. Toggle {Timeslot} to “Off”.

5. Turn on the Timeslot #5 1. Press {Timeslot #0}, {5} and {Enter}.

2. Toggle {Timeslot} to “On”.

6. Turn on the RF signal 1. Toggle [RF On/Off] to “On”.

In the Power Panel

1. Set the frequency 1. Click Channel on the Instrument Navigator panel.

2. Set Frequency (Hz) to “900 M” on the Instrument

Properties panel

2. Set the gate 1. Click Gate on the Instrument Navigator panel.

2. Select Enable Gate to enable the gate.

3. Set gate 1 Start (s) to “2.912 m”.

4. Set Length (s) to “520 μ”.

3. Set instrument source to

external trigger

1. Click Trigger on the Instrument Navigator panel.

2. Select Cont Trig on the Instrument Properties panel.

4. Start the measurement (See Figure 8) Click on the Power Panel toolbar.

Time-Gated Average Power Measurement Demonstration

Objective

To demonstrate the capability of time-gated function to carry out average power

measurement of a 900 MHz GSM pulse using the U2000 Series power sensor.

Figure 8. Time-gated average power measurement of a GSM pulse at Timeslot #5.

09 | Keysight | N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide

References

Publication title Pub number

Application Note 1449-1: Fundamental of RF and Microwave Power

Measurements (Part 1)

5988-9213EN

Application Note 1449-2: Fundamental of RF and Microwave Power

Measurements (Part 2),

5988-9214EN

Application Note 1449-3: Fundamental of RF and Microwave Power

Measurements (Part 3)

5988-9215EN

Application Note 1449-4: Fundamental of RF and Microwave Power

Measurements (Part 4)

5988-9216EN

Application Note 64-4D: 4 Steps for Making Better Power Measurements 5989-8167EN

Product Note: Choosing the Right Power Meter and Sensors 5968-7150EN

Related Literature

Publication title Pub number

Data Sheet: N1918A Power Analysis Manager 5989-6612EN

Installation Guide: N1918A Power Analysis Manager N1918A-90002

Technical Overview: N1918A Power Analysis Manager 5989-6613AEN

Data Sheet: U2000 Series USB Power Sensor 5989-6278EN

Technical Overview: U2000 Series USB Power Sensor 5989-6279EN

10 | Keysight | N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide

This information is subject to change without notice.

Published in USA, December 1, 2017

5989-7083EN

www.keysight.com

www.keysight.com/nd/usbsensor

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