Agilent 8924C User Manual

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Page 1

Agilent Technologies

8924C CDMA Mobile Station Test Set

User’s Guide

Firmware Version A.07.04 and above

POWER

DO NOT APPLY RF WHEN OFF

RF IN/OUT

MAX PWR

CDMA CALL CONTROL

CDMA SCRNS

CELL CALL CTRL

SPECTRUM

GEN

CTRL

ANALOG SCRNS

ENCODER

ANL

SPEC ANL

GEN

END

CALL

RANGE

TEST

MSRPT

TEST

DECODER

RX TEST ACP

TX TEST

SCOPE DUPLEX

CALL ANS

USER DATA

k1’

k2’

k3’

ASSIGN

RELEASE

DUPLEX OUT

MAX PWR

200 mW

ANTENNA IN

6 W

FUNCTIONS

MSG

PRINTER

HELP

DATA FUNCTIONS

REF SET

METER

INCR

: 10

SET

LO LIMIT HI LIMIT

CURSOR

CONTROL

CANCELSHIFT

I/O CONFIG CONFIG

PREV TESTS

AVG

INCR X10

PUSH TO SELECT

INSTRUMEN T STATE

ADRS

SAVE

LOCAL

RECALL

789

456 123

YES

Ω

ppm

ON/OFF

dBµV

AUDIO OUTSQUELCHVOLUMEMIC/ACC

MAX

12 v Pk

HOLD

MEAS

PRESET

RESET

MEMORY

CARD

ENTER

GHz dBm

MHz

kHz

ms Hz

AUDIO IN

LOHI

MAX

42 v Pk

Agilent Part Number: 08924-90038

Printed in U.S.A.

March 2000

Rev. G

Page 2

Notice Information contained in this document is subject to change without notice.

This material may be reproduced by or for the U.S. Government pursuant to the Copyright License under the clause at DFARS 52.227-7013 (APR 1988).

Agilent Technologies, Inc. Learning Products Department 24001 E. Mission Liberty Lake, WA 99019-9599 U.S.A.

Page 3

Manufacturer’s Declaration

This statement is provi ded to co mply with the req uiremen ts of t he German Sou nd Emission Directive, from 18 January 1991.

This product has a sound pressure emission (at the operator position) < 70 dB(A).

• Sound Pressure Lp < 70 dB(A).

• At Operator Position.

• Normal Operation.

• According to ISO 7779:1988/EN 27779:1991 (Type Test).

Herstellerbescheinigung

Diese Information steht im Zusammenhang mit den Anforderungen der

Maschinenlärminformationsverordnung vom 18 Januar 1991.

• Schalldruckpegel Lp < 70 dB(A).

• Am Arbeitsplatz.

• Normaler Betrieb.

• Nach ISO 7779:1988/EN 27779:1991 (Typprüfung).

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Safety Considerations

GENERAL This product and relate d documentation must be reviewed fo r familiariz ation with

safety markings and instructions before operation. This product has been designed and tested in accordance with IEC Publication

1010, "Safety Requirements for Electronic Measuring Apparatus," and has been supplied in a safe condition. This ins tr uct io n d ocumentation contains information and warnings which must be followed by the user to ensure safe operation and to maintain the product in a safe condition.

SAFETY EARTH GROUND A uninterruptible safety earth ground must be provided from the main power

source to the product input wiring terminals, power cord, or supplied power cord set.

CHASSIS GROUND TERMINAL T o pre vent a pot ential s hock hazard , always connect th e rear -panel chassi s ground

terminal to earth ground when operating this instrument from a dc power source. SAFETY SYMBOLS Indicates instrument damage can occur if indicated operating limits are exceeded.

Indicates hazardous vol tag es. Indicates earth (ground) terminal

WARNING

A WARNING note denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign un til the indicated conditions are fully understood and met.

CAUTION

A CAUTION note denotes a hazard. It calls attention to an operation procedure, practice, or the like, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed beyond an CAUTION note until the indicated conditions are fully u nderstood and met.

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Safety Considerations for this Instrument

WARNING This product is a Safety Class I instrument (provided with a protective

earthing ground incorporated in the power cord). The mains plug shall only be inserted in a socket outlet provided with a protective earth contact. Any interruption of the protective conductor inside or outside of the product is likely to make the product dangerous. Intentional interruption is prohibited..

Whenever it is likely that the protection has been impaired, the instrument must be made inoperative and be secured against any unintended operation.

If this instrument is to be energized via an autotransformer (for voltage reduction), make sure the common terminal is connected to the earth terminal of the power source.

If this product is not used as specified, the protection provided by the equipment could be impaired. This product must be used in a normal condition (in which all means for protection are intact) only.

No operator serviceable parts in this product. Refer servicing to qualified personnel. To prevent electrical shock, do not remove covers.

Servicing instructions are for use by qualified personnel only. To avoid electrical shock, do not perform any servicing unless you are qualified to do so.

The opening of covers or removal of parts is likely to expose dangerous voltages. Disconnect the product from all voltage sources while it is being opened.

Adjustments described in the manual are performed with power supplied to the instrument while protective covers are removed. Energy available at many points may, if contacted, result in personal injury.

The power cord is connected to internal capacitors that my remain live for 5 seconds after disconnecting the plug from its power supply.

For Continued protection against fire hazard, replace the line fuse(s) only with 250 V fuse(s) or the same current rating and type (for example, normal blow or time delay). Do not use repaired fuses or short circuited fuseholders.

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CAUTION: Always use the three-prong ac power cord supplied with this product. Failure to ensure

adequate earth grounding by not using this cord may cause product damage.

This product is designed for use in Installatio n Cat egory II and P ollutio n Degree 2 per IEC 1010 and IEC 664 respectively.

This product has autoranging line voltage input, be sure the supply voltage is within the specified range.

Ventilation Requirements: When installing the product in a cabinet, the convection into and out of the product must not be restricted. The ambient temperature (outside the cabinet) must be less than the maximum operating

temperature of the product by 4° C for every 100 watts dissipated in the cabinet. If the total power dissipated in the cabinet is greater than 800 watts, then forced convection must be used.

Product Markings CE - the CE mark is a registered trademark of the European Community. A CE

mark accompanied by a year indicated the year the design was proven. CSA - the CSA mark is a registered trademark of the Canadian Standards

Association.

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CERTIFICATION Agilent Technologies, Inc. certifies that this product met its published specifica-

tions at the time of shipment from the factory. Agilent Technologies further certifies that its calibration measurements are traceable to the United States National

Institute of Standards and Technology, to the extent allowed by the Institute’s cal i bration facility, and to the calibration facilities of other International Standards Organization members

WARRANTY This Agilent Technologies instrument product is warr anted against defects in

material and workmansh ip fo r a peri od of one y ear f rom dat e of shipme nt. During the warranty period, Agilent Technologies, Inc. will at its option, either repair or replace products which prove to be defective.

For warranty service or repair, this product must be returned to a service facility designated by Agilent Technologies. Buyer shall prepay shipping charges to Agilent T echnologi es and Agilent T echn ologies shall pay shipping charges , duties, and taxes for products returned to Agilent Technologies from another country.

Agilent Technologies warrants that its software and firmware designated by Agilent T echnol ogies for use wit h an instrument will execute it s programming in structions when properly installed on that instrument. Agilent Technologies does not warrant that the operation of the instrument, or software, or firmware will be uninterrupted or error free.

LIMITATION OF WARRANTY

EXCLUSIVE REMEDIES

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation or maintenance.

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. AGILENT TECHNOLOIGES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES. AGILENT TECHNOLOIGES SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASE ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

ASSISTANCE Product maintenance agreements and other customer assistance agreements are

available for Agilent Technologies products. For any assistance, contact your nearest Agilent Technologies Sales and Service Office.

Page 8

DECLARATION OF CONFORMITY

according to ISO/IEC Guide 22 and EN 45014

Manufacturer’s Name:

Manufacturer’s Address:

Agilent Technologies, Inc. Spokane Division

24001 E. Mission Avenue Liberty Lake, Washington 99019-9599 USA

declares that the product

Product Name: Model Number: Product Options:

CDMA Mobile Station Test Set Agilent 8924C

This declaration covers all options of the above product.

conforms to the following Product specificatio ns:

Safety: IEC 1010-1:1990+A1 / EN 61010-1:1993 EMC: CISPR 11:1990/EN 55011:1991- Group 1, Class A

EN 50082-1 : 1992 IEC 801-2:1991 - 4kV CD,8kV AD

IEC 801-3:1984 3V/m

IEC 801-4:1988 0.5 kV Sig. Lines, 1 kV Power Lines

Supplementary Information:

This product herewith complies with the requirements of the Low Voltage Directive 73/23/EEC and the EMC Directive 89/336/EEC and carries the CE-marking accordingly.

Spokane, W ash ington USA October 17, 1996

Vince Roland Reliability & Regulatory Engineering Manager

European Contact: Your local Agilent Technologies Sales and Service Office or Agilent Technologies GmbH Department ZQ/Standards Europe, Herrenberger Strasse 130, D-71034 Böblinger, Germany (FAX+49-7031-14-3143)

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Agilent 8924C Support Contacts

The documentation suppli ed with yo ur t est set is an exce llent source of re feren ce, applications, and service information. Please use these manuals if you are experiencing technical problems:

• Applications information is included in the Agilent 8924C CDMA Mobile Station Test Set Application Guide (Agilent P/N 08924-90021)

• Calibration and repair information are in the Agilent 8924C C D MA Mobile Station Test Set Assembly Level Repair Manual - this ma nual (Agilent P/N 08924-90001).

If you have used the manuals and still have application questions, contact your local Agilent Technologies Sales Representative.

Repair assistance is available for the Agilent 8924C CDMA Mobile Test Set from the factory by phone and e-mail. Internal Agilent Technologies users can contact the factory through cc:Mail© (Lotus Corporation). Parts information is also available from Agilent Technologies.

When calling or writing for repair assistance, please have the following information ready:

• Instrument m odel number (Agilent 8924C)

• Instrument Serial Number (tag located on the rear panel).

• Installed options - if any (tag located on the rear panel).

• Instrument firmware revision (displayed at the top of the screen when the Test Set is powered up, and is also displayed on the CONFIGURE screen).

Support Telephone

Numbers:

1 800 827 3848 (Spokane Division Service Assistance, U.S. only) 1 509 921 3848 (Spokane Division Service Assistance, International) 1 800 227 8164 (Agilent Direct Parts Ordering, U.S. only) 1 916 783 0804 (Agilent Service Parts Identification, U.S. & Intl.)

Electronic mail (Internet): Spokane_Service@spk.Agilent .com cc:Mail: SERVICE, SPOKANE /Agilent -Spokane,desk1

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Table 1 Regional Sales and Service Offices

United States of America: Agilent Technologies Test and Measurement Call Center P.O. Box 4026

Englewood, CO 80155-4026

(tel) 1 800 452 4844

Japan:

Agilent Technologies Japan Ltd. Measurement Assist ance Center 9-1 Takakura-Cho, Hachioji-Shi, Tokyo 192-8510, Japan

(tel) (81) 456-56-7832 (fax) (81) 426-56-7840

Asia Pacific:

Agilent Technologies 24/F, Cityplaza One, 111 Kings Road, Taikoo Shing, Hong Kong

Canada: Agilent Technologies Canada Inc. 5150 Spectrum Way Mississauga, Ontario L4W 5G1

(tel) 1 877 894 4414

Latin America:

Agilent Technologies Latin America Region Headquarters 5200 Blue Lagoon Drive, Suite #950 Miami, Florida 33126 U.S. A.

(tel) (305) 267 4245 (fax) (305) 267 4286

Europe: Agilent Technologies European Marketing Organization P.O. Box 999 1180 AZ Amstelveen The Netherlands

(tel) (3120) 547 9999 Australia/New Zealand:

Agilent Technologies Australia Pty Ltd. 347 Burwood Highway Forest Hill, Victoria 3131

(tel) 1 800 629 485 (Australia) (fax) (61 3) 9272 0749 (tel) 0 800 738 378 (New Zealand) (fax) (64 4) 802 6881

(tel) (852) 3197 7777 (fax) (852) 2506 9233

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In this Book Throughout this manual the term "Test Set" is used to denote the Agilent 8924C.

Test Set screens shown in this manual may not match those displayed on the Test Set in every d etail.

Chapter 1, Getting Started

This chapter provides basic remote and front-panel operating procedures, a quick check for verifying operation, GP-IB programming procedures, and simple programming examples.

Chapter 2, Configuring Your Test Set

This chapter provides information about setting screen intensity, setting RF voltage

interpretation, setting time and date, and setting the beeper’s volum e.

Chapter 3, Operating Overview

This chapter explains how to specify units of measure, how to use the analog meter, how to use measurement averaging, how to set a measurement reference, how to set measurement limits, how to enter and change values, how to save and recall instrument setups, how to use the USER keys, and how to set a frequency offset. It also desc ribes some important interactions that occur between screen settings.

Chapter 4, Status Reporting

This chapter provides information about the Test Set’s status reporting structure and status register groups.

Chapter 5, Memory Cards, Mass Storage

This chapter describes memory cards and mass storage devices used with the Test Set.

Chapter 6, IBASIC Controller

This chapte r is designed to provide the programmer with the information needed to develop IBASIC programs for use on the built-in IBASIC controller.

Error Messages

This section discusses error and operating messages.

Page 12

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Contents

1 Getting Started

Before Connecting a Radio 22

Accessing the Test Set’s Screens 23

Changing A Field’s Setting 26

Obtaining Measurement Results 30

Control Annunciators 35

Addressing 36

GPIB Command Guidelines 37

Verifying that the Test Set is Operating Properly 42

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Contents

2 Configuring Your Test Set

General Operating Information 44

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Contents

3 Operating Overview

To Change the Measurement Display 49

To Enter and Change Values 58

Saving and Recalling Instrument Setups 61

Using USER Keys 65

Setting an RF Generator/Analyzer Frequency Offset 67

Setting an RF Generator/Analyzer Level Offset 68

Interaction Between Screens 69

Printing A Screen 71

Measurement Triggering Process 72

Triggering Analog Measurements In Local Mode (Front Panel Operation) 76

Triggering CDMA Measurements In Local Mode (Front Panel Operation) 79

Triggering Analog Measurements In Remote Mode (GPIB Operation) 82

Triggering CDMA Measurements In Remote Mode (GPIB Operation) 84

Increasing Measurement Throughput 86

Passing Instrument Control 94

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Contents

4 Status Reporting

Status Reporting 106

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Contents

5 Memory Cards/Mass Storage

Default File System 206

Mass Storage Device Overview 208

Default Mass Storage Locations 215

Mass Storage Access 217

DOS and LIF File System Considerations 218

Using the ROM Disk 223

Using Memory Cards 224

Backing Up Procedure and Library Files 230

Copying Files Using IBASIC Commands 231

Using RAM Disk 233

Using External Disk Drives 235

Page 18

Contents

6 IBASIC Controller

Introduction 238

The IBASIC Controller Screen 239

Important Notes for Program Development 241

Program Development 242

Interfacing to the IBASIC Controller using Serial Ports 244

Choosing Your Development Method 257

Method #1. Program Development on an External BASIC Language Computer 259

Method #2. Developing Progra ms on the Test Set Using the IBASIC EDIT Mode 266

Method #3. Developing Programs Using Word Processor on a PC (Least Preferred) 270

Uploading Programs from the Test Set to a PC 277

Serial I/O from IBASIC Programs 278

PROGram Subsystem 281

The TESTS Subsystem 302

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Contents

Index 337

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Contents

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1 Getting Started

This chapte r will help familiarize you with fundamen tal Test Set operation, including:

• Accessing screens and fields

• Making a simple measurement

• Preparation for remote operation via GPIB

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Chapter 1, Getting Started

Before Connecting a Radio

NOTE: The RF IN/OUT port should be used for all transmitter tests when th e radio is connected

directly to the Test Set. (All MSUT (Mobile Station Under Test) transmitter power measurements are made through this port). Off-the-air measurements can be made using the highly-sensitive ANT IN port.

CAUTION: Overpower Damage — Refer to the Test Set’s front panel for maximum input power level.

Exceeding this level can cause permanent instrument damage.

Overpower Damage — Blocking the fans’s rotation or operating the Test Set in an environment that causes excessive heat may cause damage.

Important: If excessive temperatures are sensed on the power supply regulator assembly, the Test Set’s power supply will shut off. After temperature has lowered to within normal operating range, use the POWER switch to cycle power on. Remove RF power from the RF IN/OUT connector whenever the Test Set is off.

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Accessing the Test Set’s Screens

CDMA and Analog Modes

The Test Set has two operating modes, analog and CDMA. In CDMA mode, the T est Set conf igure s itself as a cal ibrat ed CDMA base st ation . In Ana log mode, t he Test Set has AMPS, NAMPS and TACS analog cellular phone test capability.

CDMA is the default power-up mode. To enter analog mode from CDMA mode:

• press one of the ANLG SCRNS keys, or

• select a screen from the Analog To Screen menu, or

• programmatically select an analog screen using the d isplay (DISP) GPIB subsystem, or

• execute a CDMA to Analog handoff.

To enter CDMA mode from analog mode:

• press one of the CDMA SCRNS keys, or

• select a screen from the CDMA To Screen menu, or

• programmatically select a CDMA screen using the display (DISP) GPIB subsystem.

Chapter 1, Getting Started

Page 24

Chapter 1, Getting Started

Functions Screens

Accessing the Test Set’s Screens

Screens that control various instrument functions such as configuration, access to the Tests subsystem, and the PREV (previous screen) key are found under the

front-panel “Functi ons ” brac ket.

CDMA Digital Transceiver Measurements

Analog Transceiver Tests

POWER

DO NOT APPLY RF WHEN OFF

RF IN/OUT

MAX PWR

6 W

DUPLEX OUT

MAX PWR

200 mW

ANTENNA IN

Figure 1 Accessing Test Set Screens

Instrument Functions

CDMA CALL CONTRO L

CDMA SCRNS

CELL CALL CTRL

SPECTRUM

GEN

CTRL

ANALOG SCRNS

ENCODER

ANL

SPEC ANL

GEN

END

CALL

RANGE

TEST

MSRPT

TEST

DECODER

RX TEST ACP

TX TEST

SCOPE

DUPLEX

CALL ANS

USER DATA

k1’

k2’

k2 k3’

ASSIGN

RELEASE

FUNCTIONS

MSG

PRINTER

HELP

DATA FUNCTIONS

REF SET

METER

INCR

: 10

SET

LO LIMIT HI LIMIT

CURSOR CONTROL

CANCELSHIFT

I/O CONFIG CONFIG

PREV TESTS

AVG

INCR X10

PUSH TO

SELECT

INSTRUMENT STATE

ADRS

LOCAL

789

456 123 0

YES

NO ppm

ON/OFF

AUDIO OUTSQUELCHVOLUMEMIC/ACC

MAX

12 v Pk

SAVE

RECALL

HOLD

MEAS

PRESET

RESET

MEMORY

CARD

ENTER

GHz dBm

MHz

kHz

Ω

dBµV

AUDIO IN

LOHI

MAX

42 v Pk

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Page 25

Accessing the Test Set’s Screens

Cursor Control

Chapter 1, Getting Started

INSTRUMENT STATE

ADRS

SAVE

LOCAL

RECALL

789

456 123

YES

Ω

ppm

ON/OFF

dBµV

AUDIO OUTSQUELCHVOLUMEMIC/ACC

MAX

12 v Pk

HOLD

MEAS

PRESET

RESET

MEMORY

CARD

ENTER

GHz dBm

MHz

kHz

ms Hz

AUDIO IN

LOHI

MAX

42 v Pk

MAX PWR

200 mW

ANTENNA IN

CDMA CALL CONT ROL

CDMA SCRNS

CELL CALL CTRL

SPECTRUM

GEN

CTRL

CDMA SCRNS

ENCODER

ANL

SPEC ANL

GEN

END

CALL

RANGE

TEST

MSRPT

TEST

DECODER

TEST

ACP

TEST

SCOPE DUPLEX

CALL ANS

USER DATA

k1’

k2’

k3’

ASSIGN

RELEASE

FUNCTIONS

MSG

PRINTER

HELP

DATA FUNCTIONS

REF SET

METER

INCR

: 10

SET

LO LIMIT HI LIMIT

CURSOR

CONTROL

CANCELSHIFT

I/O CONFIG CONFIG

PREV TESTS

AVG

INCR X10

PUSH TO SELECT

1. Position

To position the cursor, rotate the Cursor Control knob, which moves the cursor from field to field or from menu item to menu item. Normally the cursor appears as a small highlighted rectangular box.

2. Select

To select an item, push the Curso r Control knob. After selection, t he background of the item selected becomes highlighted or the item selected appears in an associated field.

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Chapter 1, Getting Started

Changing A Field’s Setting

There are several types of CRT display fields in the Test Set. This section describes some of the different types of fields, and how they are used.

Units-of-Measure Field

Figure 2 Units-of-Measure Field

Units-of-measure f iel ds al low selection of val id uni ts f or given measurement. See

figure 2 to see an example of a units-of-measure field.

To change a unit-of-measure

1. Position the cursor at the unit field on the display.

2. Press a key labeled with a different unit-of-measure (such as W).

3. If the new units are valid, the measurement value will be displayed in the new unit-of-

measure.

To change the units-of-measure for data transfer via GPIB, see "To Specify Units-

of-Measure for GPIB Data Transfer" in chapter 3

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Changing A Field’s Setting

Underlined Immediate-Action Field

Chapter 1, Getting Started

Figure 3 Underlined Immediate-Action Field

Underlined immediate action fields provide a choice of two settings. See in

figure 3 to see an example of an underlined immediate-action field.

To change an underlined entry

1. Position the cursor at the field.

2. Push the CURSOR CONTROL knob or the ENTER key to underline the desired

choice.

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Chapter 1, Getting Started

One-of-Many Field

Changing A Field’s Setting

Figure 4 One-of-Many Field

One-of-many fields displ ay a list of cho ices when select ed. See in figure 4 to see an example of a one-of many field.

To make a one-of-many choice

1. Position the cursor at the field.

2. Push the C

3. Move the cursor through the choices by turning the knob.

4. Push the C

URSOR CONTROL knob or the ENTER key to display the choices.

URSOR CONTROL knob or the ENTER key to make the choice.

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Changing A Field’s Setting

Numeric-Entry Field

Chapter 1, Getting Started

Figure 5 Numeric-Entry Field

Numeric-entry fields contain numeric values. See in figure 5 to see an example of a numeric-entry field.

To change a value

1. Position the cursor at the field.

2. Key in the desired number using the DATA keys.

3. Press ENTER to select the choice.

1. Position the cursor at the field.

2. Push the C

3. Turn the knob to increment or decrement the value.

4. Push the C

URSOR CONTROL knob to high li g ht the desi red choice.

URSOR CONTROL knob or the ENTER key to select the choice.

Page 30

Chapter 1, Getting Started

Obtaining Measurement Results

Setting Up a Call

To obtain CDMA measurements, the Test Set must have the MSUT (Mobile Station Under Test) on a call (the Connected annunciator on the CDMA CALL CONTROL screen is lit when the MSUT is on a call).

The procedure for setting up a call is provided in “Setting Up a Call”, found in the

Agilent 8924C Application Guide

are also procedures for performing CDMA tests.

Triggering and Displaying Measurements

When operated over the fro nt panel (local control), Test Set measurement results are obtained by selecting a screen that displays the desired measurement, arming the measurement if necessary, and observing the displayed value.

. In the Agilent 8924C Application Guide, there

When operated remotely, measurement results are obtained via GPIB by triggering a measurement if necessary and querying the desired measurement field.

NOTE: In CDMA mode, transmitter (TX) measureme nts and r eceiv er (RX) mea surement s can

run concurrently. For example, an Average Power or Channel Power measurement can be queried while the RX TEST screen is selected and an FER measurement is running.

For a detailed description of triggering measurements, see

Displaying Measurements" on page 30

"Triggering and

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Obtaining Measurement Results

Preparing the Test Set for GPIB Control

1. If other GPIB devices are in the system, attach an GPIB cable from the Test Set’s rear-

panel GPIB connector to any one of the other devices in the test system.

2. Access the I/O CONFIGURE screen and perform the following steps: a. Set the Test Set’s GPIB address using the GPIB Adrs field (see "Addressing"

on page 36).

b. Set the Test Set’s GPIB Controller capability using the Mode field.

• Talk&Listen configures the Test Set t o be control led throu gh GPIB with an external controller. The Test Set has Active Controller capability (take control/ pass control) in this mode.

• Control configures the Test Set to be the system controller. Use this setting if the Test Set will be the only controller on the GPIB. Selecting Control automatically makes the Test Set the active controller.

NOTE: Only one active controller is allowed on the GPIB at one time!

Chapter 1, Getting Started

3. If an GPIB printer is or will be connected to the Test Set’s rear-panel GPIB connector,

perform the following steps:

a. Access the PRINT CONFIGURE screen. b. Select one of the supported GPIB printer models using the Model field. c. Set the Printer Port field to GPIB. d. Set the printer address using the Printer Address field.

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Chapter 1, Getting Started

Obtaining Measurement Results

General Programming Procedure

1. For each measurement you want to perform programmatically, make the measurement

manually using the front-panel controls of th e Test Set. Yo u will find procedures for making measurements in the Agilent 8924C Application Guide. Record, in sequential order, the screens selected and the settings made within each screen.

2. Record the measurement result(s).

3. Develop the program using the measurement procedure generated in step 2. For CDMA

measurements, the Agilent 8924C Application Guide provides step-by-step GPIB command examples.

4. Make sure the desired measurement is selected and in the ON state. This is the PRESET

state for most measurements. However, if a previous program has set the state to OFF, no measurement result will be available. Attempting to read from a measurement field that is not in the ON state will cause GPIB Error:-420 Query

UNTERMINATED.

5. Trigger the desired measurement if the RETRigger MODE is SINGle. You will find

that the Test Set automatically enters REPetitive trigger MODE for CDMA measurements when an GPIB command is sent to it.

6. Send the appropriate MEASure query command to initiate a reading. This will place the

measured value into the Test Set’s Output Queue.

7. Use the ENTER st atement to transfer the measured value to a variable within the

context of the program.

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Page 33

Obtaining Measurement Results

Basic Programming Examples

The following examples illustrate the basic approach to controlling the Test Set through the GPIB. The punctuatio n and comman d syntax us ed for th ese exampl es is given in

The bus address 714 used in the following BASIC language examples uses an GPIB interface at select code 7, and a Test Set GPIB address of 14. All examples use an external controller.

To Change a Field’s Setting

1. Access the screen containing the field whose setting is to be changed by using the DISP

command.

2. Make the desired setting using the proper command syntax (refer to

“GPIB Command Syntax” chapter in the Agilent 8924C Condensed Programming Reference Guide for proper syntax).

The following example makes several instrument setting changes:

Chapter 1, Getting Started

"Command Punctuation" on page 38.

OUTPUT 714;”DISP CCNT”!Displays the CDMA CALL CONTROL screen. OUTPUT 714;”CDMA:CELL:ASEC -100”!Sets Sector A Power to -100 dBm/BW. OUTPUT 714;”RFG:OUTP ’DUPL’”!Sets the Output Port to Duplex.

To Read a Field’s Setting

1. Access the screen containing the field whose setting is to be read using the DISPlay

command.

2. Use the query form of the syntax for that field to place the setting’s value into the Test

Set’s output buffer.

3. Enter the value into the correct variable type within the program’s context.

The following example reads the current power measurement selection (Average Power or Channel Power).

10 OUTPUT 714;”DISP CTXT” !Displays the CDMA CELLULAR MOBILE TRANSMITTER TEST screen. 20 OUTPUT 714;”CDMA:TX:POW:MEAS?” !Queries the Average Power/Channel Power field. 30 ENTER 714;Pow$ !Enters the returned value into a string variable

40 PRINT “The power measurement currently selected is “,Pow$ 50 END

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Chapter 1, Getting Started

Obtaining Measurement Results

To Make a Simple Measurement

1. Access the screen containing the desired measurement by using the DISP command.

2. Use the MEAS form of the syntax for that measurement to place the measured value

into the Test Set’s output buffer.

3. Enter the value into the correct variable type within the program’s context (refer to the

”Number Measurement Syntax” in GPIB Command Syntax chapter of the Agilent

8924C Condensed Programming Reference Guide for the proper variable type).

NOTE: Whenever a numeric value is queried, the returned value is always in GPIB Units. Refer to

"To Specify Units-of-Measure for GPIB Data Transfer" on page 56.

The following example program illustrates how to make settings and then take a reading from the Test Set. This setup takes a reading from the analog spectrum

analyzer’s marker after tuning it to the RF generator output frequency.

10 Addr=714 20 OUTPUT Addr;”*RST”! Preset to known state

25 OUPTUT Addr;”CONF:OFR 0” !Set the RF frequency offset to 0 MHz. 30 OUTPUT Addr;”TRIG:MODE:RETR SING”! Sets single trigger 40 OUTPUT Addr;”DISP RFG”! Selects the RF GENERATOR screen 50 OUTPUT Addr;”AFG1:FM:STAT OFF”! Turns FM OFF 60 OUTPUT Addr;”RFG:AMPL -66 DBM”! Sets RF Gen amplitude to -66 dBm 70 OUTPUT Addr;”RFG:FREQ 500 MHZ”! Sets RF Gen frequency to 500 MHz 80 OUTPUT Addr;”RFG:AMPL:STAT ON”! Turns RF Gen output ON 90 OUTPUT Addr;”DISP SAN”! Selects SPECTRUM ANALYZER screen 100 OUTPUT Addr;”SAN:CRF 500 MHZ”! Center Frequency 500 MHz 110 ! -------------------MEASUREMENT SEQUENCE-------------------120 OUTPUT Addr;”TRIG”! Triggers reading 130 OUTPUT Addr;”MEAS:SAN:MARK:LEV?”! Query of Spec Anl marker level 140 ENTER Addr;Lvl! Places measured value in variable Lvl 150 DISP Lvl! Displays value of Lvl 160 END

The above example is very simple and is designe d to demonstrate the fundamental procedure for obtaining a measurement result. Many other factors must be considered when designing a measurement proce dure, such as instrume nt settings, signal routing, settling time, filtering, triggering and measurement speed.

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Control Annunciators

The letters and symbols at the top right corner of the display indicate these conditions:

R indicates the T est Set is in remote mode. The Test Set can be put into the remote mode by an external controller or by an IBASIC program running on the built-in IBASIC controller.

• L indicates the Test Set has been addressed to listen.

• T indicates the Test Set has been addressed to talk.

• S indicates the Test Set has sent the require service message by setting the service re-

quest (SRQ) bus line true. (Se e "Status Reporting" on page 106).

• C indicates the Test Set is currently the active controller on the bus.

• * indicates an IBASIC program is running.

Chapter 1, Getting Started

• ? indicates an IBASIC program is waiting for a user response.

• - indicates an IBASIC program is paused.

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Chapter 1, Getting Started

Addressing

Setting the Test Set Bus Address

The Test Set’s GPIB bus address is set using the GPIB Adrs field which is located on the I/O CONFIGURE screen. The Test Set’s GPIB address is set to decimal 14 at the factory. To set a different GPIB bus address; select the I/O CONFIGURE screen and position the cursor next to the address can be set from decimal 0 to 30 using the numeric DATA keys, or by pushing and then rotating the CURSOR CONTROL knob. There are no switches for setting the GPIB bus add ress in the Test Set. The new sett ing is retained when the Test Set is turned off.

Displaying the Bus Address

GPIB Adrs field. The

The Test Set’s GPIB bus address can be displayed by pressing and releasing the SHIF T key, then the LOCAL key . The address is displaye d in the upper-lef t corner of the display.

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GPIB Command Guidelines

Command Names

GPIB commands are not case sensitive. Upper and lower case characters can be used for all commands.

For example, to set the destination of AF Generator 1 to Audio Out, any of the following command strings are valid:

“AFGENERATOR1:DESTINATION ’AUDIO OUT’” or “afgenerator1:destination ’audio out’” or “afg1:dest ’audio out’” or “AFG1:DEST ’AUDIO OUT’” or “Afg1:Dest ’Audio oUT’”

Chapter 1, Getting Started

All command names of more than four characters have an alternate abbreviated form. The abbreviated form is presented in uppercase letters in the syntax diagrams.

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Chapter 1, Getting Started

GPIB Command Guidelines

Command Punctuation

NOTE: Programming Language Considera tions: The punctuation rules for the Test Set’s GPIB

commands conform to the IEEE 488.2 standard. It is possible that some programming languages used on external controllers may not accept some of the punctuation requirements. It is therefore necessary that the equivalent form of the correct punctuation, as defined by the language, be used for GPIB operation. Improper pun ctuation will result in GPIB Error: - 102 Syntax Error.

Using Quotes for String Entries

Quotation marks are used to select non-numeric field settings. The value is entered into the command line as a quoted alphanumeric string.

Quotes are used with all underlined fields. (See

"To Change a Field’s Setting" on page 33.)

For example: to set the RF Generator’s choice

“RFG:OUTP ’Dupl’”

Using Spaces

Dupl would be entered into the command string.

(toggling) and one-of-many (menu choice)

Output Port field to duplex, the menu

When changing a field’s setting, a space must always precede the setting value in the command string, regardless of the field type.

space

850MHZ

’OFF’

RFG:FREQ RFG:ATT

Using Colons to Separate Co mmands

The GPIB command syntax is structured using a control hierarchy that is analogous to manual operation.

The control hierarchy for making a manual instrument setting using the frontpanel contro ls is as follows: first the screen is accessed, then the de sired field +is selected, then the appropriate setting is made. GPIB commands use the same hierarchy. The colon (:) is used to separate the different levels of the command hierarchy.

For example: To set the AF Analyzer’s input gain to 40 dB, the following command syntax would be used:

“DISP AFAN” “AFAN:INP:GAIN ’40 dB’”

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GPIB Command Guidelines

Chapter 1, Getting Started

Using the Semicolon to Output Multiple Commands

Multiple commands can be output from one program line by separating the

commands with a semicolon (;). The semicolon tells the Test Set’s GPIB command parser to back up one level of hierarchy and accept the next command at the same level as the previous command.

For example, on one command line, it is possible to:

1. access the AF ANALYZER screen,

2. set the AF analyzer’s input to AM Demod

3. set Filter 1 to 300 Hz GPF

4. set Filter 2 to 3kHz LPF

“DISP AFAN;AFAN:INP ’AM DEMOD’;FILT1 ’300Hz HPF’;FILT2 ’3kHz LPF’”

The semicolon after the “DISP AFAN” command tells the Test Set’s GPIB command parser that the next command is at the same level in the command hierarchy as the display command. Similarly, the semicolon after the INP ’AM DEMOD’ comman d tells the comma nd parser that the next command (FILT1 ’300Hz HPF’) is at the same command level as the INP ’AM DEMOD’ command.

Using the Semicolon Colon (;:) to Separate Commands

A semicolon followed by a colon (;:) t el ls t he GPIB command parser th at the next command is at the top level of the command hiera rchy. This allows commands for different instruments to be output on one command line. The following example sets the RF Analyzer’s tune frequency to 850 MHz, and then sets the AF Analyzer’s input to FM Demod.

“RFAN:FREQ 850 MHZ;:AFAN:INP ’FM DEMOD’”

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Chapter 1, Getting Started

GPIB Command Guidelines

Using Question Marks to Query Setting or Measurement Fields

The question mark (?) is used to query (read-back) an instrument setting or measurement value. To generate the query form o f a command , place the qu estio n mark immediately after the command. Queried information must be read into the proper variable type within the program context before it can be displayed, printed, or used as a numeric value in the program.

Queried informati on is re turne d in the same f ormat u sed to se t the value ( a queried numeric field returns numeric data; quoted string fields return quoted string information).

For example, the following BASIC language program statements query the current setting of the

OUTPUT 714;”AFG1:DEST?”!Query the AFGen1 To field. ENTER 714;Afg1_to$!Enter queried value into a string variable

Sample GPIB Program

AFGen 1 To field:

The following program was written on an HP 9000 Series 300 controller using Hewlett-Packard Rocky Mountain BASIC (RMB). To run this program directly in

the Test Set’s IBASIC Controller:

1. use exclamation marks (!) to comment-out lines 440, 450, and 460 (these commands

not supported in IBASIC).

2. change line 70 to Bus = 8 (internal GPIB select code = 8).

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Chapter 1, Getting Started

GPIB Command Guidelines

10 ! This program generates an FM carrier, measures and displays the 20 ! deviation, and draws the modulation waveform from the oscilloscope 30 ! to the CRT display. For demonstration purposes the 40 ! carrier is generated and analyzed through the uncalibrated input 50 ! path so that no external cables are required. 60 GCLEAR! Clear graphics display. 70 Bus=7! Interface select code of GPIB interface 80 Dut=100*Bus+14! Default Test Set GPIB address is 14 90 CLEAR Bus ! Good practice to clear the bus 100 CLEAR SCREEN ! Clear the CRT

110 OUTPUT Dut;”*RST” ! Preset the Test Set 120 OUTPUT Dut;”DISP DUPL” ! Display the DUPLEX TEST screen 130 OUTPUT Dut;”RFG:AMPL -14 DBM”! Set RF Gen Amplitude to -14 dBm 140 OUTPUT Dut;”AFAN:INP ’FM Demod’” ! Set AF Analyzer input to FM Demod 150 OUTPUT Dut;”AFAN:DET ’Pk+-Max’” ! Set AF Analyzer detector to Peak +/-Max 160 ! 170 ! The following trigger guarantees that the instrument will auto-tune and 180 ! auto-range to the input signal before measuring. 190 ! 200 OUTPUT Dut;”TRIG” ! Trigger all active measurements 210 OUTPUT Dut;”MEAS:AFR:FM?” ! Request an FM deviation measurement 220 ENTER Dut;Dev ! Read measured value into variable Dev 230 PRINT USING “K,D.DDD,K”;”Measured FM = “,Dev/1000,” kHz peak.” 240 DISP “’Continue’ when ready...” ! Set up user prompt 250 ON KEY 1 LABEL “Continue”,15 GOTO Proceed ! Set up interrupt on softkey 1 260 LOOP ! Loop until the key is pressed 270 END LOOP 280 Proceed: OFF KEY ! Turn off interrupt from softkey 1 290 DISP “” ! Clear the user prompt 300 ! 310 ! Measure and plot an oscilloscope trace to see the waveform shape. 320 DIM Trace(0:416) ! Oscilloscope has 417 trace points 330 OUTPUT Dut;”DISP OSC” ! Display the OSCILLOSCOPE screen 340 OUTPUT Dut;”TRIG” ! Trigger all active measurements 350 OUTPUT Dut;”MEAS:OSC:TRAC?” ! Request the oscilloscope trace 360 ENTER Dut;Trace(*) ! Read the oscilloscope trace into array Trace(*) 370 ! 380 ! CRT is (X,Y)=(0,0) in lower left corner to (399,179) upper right. 390 ! (Each pixel is about 0.02 mm wide by 0.03 mm tall, not square.) 400 ! Scale vertically for 0 kHz dev center-screen and +4 kHz dev top 410 ! of screen. Leave the next three lines for external control, or 420 ! comment them out for IBASIC (Test Set stand-alone) control. 430 ! 440 PLOTTER IS CRT,”98627A” !Your display may have a different specifier. 450 GRAPHICS ON!Enable graphics to plot the waveform. 460 WINDOW 0,399,0,179 470 ! 480 PEN 1 !Turn on drawing pen 490 MOVE 0,89.5+Trace(0)/4000*89.5 500 FOR I=1 TO 416 510 DRAW I/416*399,89.5+Trace(I)/4000*89.5 520 NEXT I 530 END

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Chapter 1, Getting Started

Verifying that the Test Set is Operating Properly

If your T est Set powers- up and displays the CDMA CALL CONTROL screen, but you suspect an instrument problem, the CDMA Mode Quick Check will verify

operation of the instrument’s basic functions.

CDMA Mode Quick Check

NOTE: This procedure assumes that the Test Set is configur ed for cellular mobile station testing. If

necessary, access the CONFIGURE screen and turn PCS Intrfc Control Off necessary to cycle power.

1. Remove any cabling from the front-panel connectors.

2. Turn instrument power on (if it is not already on).

3. Press the PRESET key.

. It will then be

4. Press and release the SHIFT key then the TESTS key to access the CONFIGURE

screen.

5. Position the cursor in the RF Display field, and press the knob to select Freq. The

RF Offset and (Gen)-(Anl)fields will appear below RF Display.

6. Change the (Gen)-(Anl) value to 0 MHz.

7. Position the cursor in the Output Port field and Select Dupl

8. Press GEN CTRL, +/-, 5, 0 ENTER to adjust Sector A Power to -50 dBm/BW.

9. Press and release the SHIFT key then the GEN CTRL key to access the CDMA

REVERSE CHANNEL SPECTRUM analyzer screen.

10. Position the cursor in the Ref Level field, and press +/-, 1, 0, ENTER to enter a

reference level of -10 dBm.

11. The display should show a CDMA signal, approximately 1.23 MHz wide.

If no failure is indicated by this test, but you still suspect a problem, refer to the performance tests information in the Agilent 8924C Assembly Level Repair Manual.

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2 Configuring Your Test Set

This chapter will help you prepar e the Test Set for operation in your enviro nment. This includ es:

• Setting screen intensity

• Setting time and date

• Setting beeper volume

Page 44

Chapter 2, Configuring Your Test Set

General Operating Information

The following configuration information discusses general operating information for some of the fields in the CONFIGURE screen.

To Set Screen Intensity

1. Access the CONFIGURE screen.

2. Select the Intensity field.

3. Rotate the knob to change the setting (1=dim, 8=bright).

To Set RF Voltage Interpretation (50 ohm/emf)

1. Access the CONFIGURE screen.

2. Position the cursor in front of the RFGen Volts field.

3. Press the CURSOR CONTROL knob or press the ENTER key to select 50 ohm

emf

Voltage settings can control either:

• the voltage across a 50-ohm load, or

• the open circuit voltage (emf).

This setting affects the RF Generator and Tracking Generator amplitudes.

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General Operating Information

To Set the Date and Time

1. Access the CONFIGURE screen.

2. Select the Date field and use the DATA keys to enter the date in the format shown

below the field.

3. Select the Time field and use the DATA keys to enter the time in the format shown

below the field.

The Test Set has a built-in clock that keeps track of the date and time. It is powered by an internal battery to keep it operating when the instrument is off.

To Change the Beeper’s Volume

1. Access the CONFIGURE screen.

2. Select the Beeper field to display the volume choices.

3. Select the desired choice.

The beeper alerts you to important operating and measurement conditions. It beeps any time a message is displayed at the top of the screen. These messages warn you of condition s such as exc eeding the RF input level or t rying to set a fi eld to an unacceptable value. The refore, it is rec ommended that you do no t dis able the beeper .

Chapter 2, Configuring Your Test Set

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Chapter 2, Configuring Your Test Set

General Operating Information

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3 Operating Overview

Page 48

Chapter 3, Operating Overview

The information in this chapter describes how to use many of the operating features of the Test Set, including:

• "To Change the Measurement Display" on page 49

• "To Enter and Change Values" on page 58

• "Saving and Recalling Instrument Setups" on page 61

• "Using USER Keys" on page 65

• "Setting an RF Generator/Analyzer Frequency Offset" on page 67

• "Setting an RF Generator/Analyzer Level Offset" on page 68

• "Interaction Between Screens" on page 69

• "Printing A Screen" on page 71

• "Measurement Triggering Process" on page 72

• "Triggering Analog Measurements In Local Mode (Front Panel Operation)" on

• "Triggering CDMA Measurements In Local Mode (Front Panel Operation)" on

• "Triggering Analog Measurements In Remote Mode (GPIB Operation)" on page

• "Triggering CDMA Measurements In Remote Mode (GPIB Operation)" on page

• "Increasing Measurement Throughput" on page 86

• "Passing Instrument Control" on page 94

page 76

page 79

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To Change the Measurement Display

Using the On/Off Function

The on/off function is used for the following operations.

• Measurements that are displayed as numbers , or as meters using the METER function , can be turned on and off.

• The data functions REFerence, METer, HLIMit and LLIMit can be turned on and off.

• Any instrument functio n that generates a s ignal can be tu rned on and o ff. This in cludes the CDMA Sector A Power, Sector B Power, and AWGN.

• Trace displays, such as the CDMA Reverse Channel Spectrum Analyzer, cannot be turned off.

The front-panel ON/OFF key is used to turn measurements, instrument functions and data functions on or off.

Chapter 3, Operating Overview

Front-Panel Example

The following front-panel operation turns Avg Power off.

1. Move the cursor in front of the unit-of-measure for the Avg Power measurement.

2. Press the ON/OFF key. The Avg Power measurement field displays the word OFF

in place of units

The GPIB STATe command corresponds to the front-pa nel ON/OFF key. You can use 1 in place of on, or 0 in place of off.

GPIB Example

The following GPIB command turns off the Avg Power measurement.

“DISP CCNT;MEAS:CDM:AVGP:STAT OFF”

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Chapter 3, Operating Overview

To Change the Measurement Display

To Use the METER Format

The METER function displays measurements graphically. The METER format is available for most measurements. To determine if the METER format is provided

for a measurement, position the cursor in front of the measurement’s units field and press the knob. If the message “Press ON/OFF, LIMIT s , REF, AVG, METER, or units” is displayed, the METER format is provided.

As a measurement is displayed on the meter, the value is also displayed in small digits below the meter. You can specify the high and low end points and number of intervals, or you can use the default meter settings.

1. Position the cursor in front of the measurement’s unit-of-measure.

2. Press and release the SHIFT key, then the INCR SET key to select the METER func-

tion. The default number of average samples is displayed below the measurement.

3. Select On/Off

4. Repeat steps 1 and 2 then select LoEnd, Hi End, or Intervals to enter each meter

end point and the meter intervals.

5. Repeat steps 1, 2, and 3 to cancel the meter function.

from the Meters: field on the CRT display

Front-Panel Example

The following front panel operation turns on the Avg Power measurement meter.

1. Move the cursor in front of the unit-of-measure for the Avg Power measurement).

2. Press and release the SHIFT key, then the INCR SET key to select the METER func-

tion, then press the ENTER key. The meter will appear below the measur ement units field with default low/high ends and number o f in tervals. To tur n off the measurement meter, repeat this process.

GPIB Example

The following GPIB command turns on the Avg Power measurement’s meter.

“DISP CCNT;MEAS:CDM:AVGP:MET ON”

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To Change the Measurement Display

To Set a Measurement Reference

The REF SET function establishes a measurement reference point. This allows you to make a direct comparison between two measurement results, or between a measurement standard and the actual measurement results.

Referenced measurements are displayed as either a ratio (dB) or diff erence between the measured value and the reference.

1. Position the cursor in front of the unit-of-measure for the measurement you want to set the reference for.

2. Press and release the SHIFT key, then the INCR ÷10 key to select the REF SET func- tion.

3. Enter the reference value.

4. Ref appears below the measurement value to indicate that a reference has been set. The

measurement field may display a different u nit-of-measure, and limit ch oices for units.

Front-Panel Example

The following front-panel operation sets a 10 dBm reference for Avg Power measurements.

Chapter 3, Operating Overview

1. Move the cursor in front of the unit-of-measure for the Avg Power measurement).

2. Press and release the SHIFT key, then the INCR ÷10 key.

3. Enter 10 dBm using the DATA keys.

The abbreviation Ref will appear below the Avg Power measurement field and Avg Power measurements will be expressed in dB. Absolute power (mW, W) will

not be selectable.

GPIB Example

The following GPIB command also sets a 10 dBm reference for Avg Power measurements.

“DISP CCNT;MEAS:CDM:AVGP:REF 10 DBM”

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Chapter 3, Operating Overview

To Change the Measurement Display

To Use Measurement Averaging

The AVG (average) function allows you to reduce the effects of a rapidly changing measurement by displaying the average value of a number of measurements.

1. Position the cursor in front of the measurement’s unit-of-measure.

2. Press and release the SHIFT key, then the INCR × 10 key to select the AVG function.

The default number of average samples is displayed below the measurement.

• Enter the desired number of measurement samples to be used for calculating the

average, or

• Press the ON/OFF key to use the currently-displayed number of samples.

3. To turn averaging off, position the cursor in front of the unit-of-measure and press release the SHIFT key, then the INCR × 10 key, then the ON/OFF key to turn averaging off.

Front-Panel Example

The following front-panel operation averages Avg Power measurements over 10 samples.

1. Move the cursor in front of the unit-of-measure for the Avg Power measurement.

2. Press and release the SHIFT key, then the INCR × 10 key to select the AVG function.

3. Enter 10 using the DATA keys and press the ENTER key. The abbreviation Avg will

appear below the Avg Power measurement field.

GPIB Example

The following GPIB command also averages Avg Power measurements over 10 samples.

“DISP CCNT;MEAS:CDM:AVGP:AVER 10;AVER:STAT ON”

When Averaging is used, the displayed value will ramp (as opposed to step) in response to changes in the measured values.

Pressing the MEAS RESET key clears the measurement history for all measurements and restarts the averaging process.

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To Change the Measurement Display

Setting Measurement Limits

The LO LIMIT and HI LIMIT functions are used to define a measurement

“window” to alert you to measurements th at are outside these limits. Wh en limits are assigned,

A measurement that goes above or be low t he defined limits causes thr ee thi ngs to happen:

1. A message appears at the top of the screen indicating a limit was exceeded.

2. The Lo or Hi indicator by the measurement flashes.

3. The Beeper beeps if it is has not been turned off in the CONFIGURATION screen.

Limits are helpful when you can’t watch the Test Set display while you are making an adjustment on the equip ment you are test ing or r epairing. They are a lso a convenient way of alerting you to long-term measurement drift without having to observe the screen.

1. Position the cursor in front of the unit-of-measure for the measurement you are setting limits for.

2. Press and release the SHIFT key, then the down-arrow key to select the LO LIMIT function.

3. Enter the measurement’s low limit value and unit-of-measure.

4. Press and release the SHIFT key, then the up-arrow key to select the LO LIMIT func-

tion.

5. Enter the measurement’s high limit value and unit-of-measure.

Chapter 3, Operating Overview

Lo and/or Hi appear by the measurement.

To reset a limit that has been exceeded:

1. Position the cursor in front of the unit-of-measure for the measurement you assigned the limit to.

2. Press and release the SHIFT key, then the down-arrow (LO LIMIT) or up-arrow (HI LIMIT key, or press the MEAS RESET key.

To remove a limit you have set:

1. Position the cursor in front of the unit-of-measure for the measurement you assigned the limit to.

2. Press and release the SHIFT key, then the down-arrow (LO LIMIT) or up-arrow (HI LIMIT key, then press the ON/OFF key.

1. The fundamental unit for the LIMITs does not have to be the same as the measure-

ment’s units. For instance, when measuring AC Level in Volts, you can set HI and LO LIMITs in units of dBm if desired.

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Chapter 3, Operating Overview

To Change the Measurement Display

Front-Panel Example

This example sets limits fo r the Avg Power measurement. These limits will indicate if the power level is between

1. Po sition the cursor in front of the unit-of-measure for the Avg Power measurement

2. Press and release the SHIFT key, then the down-arrow key to select the LO LIMIT

3. Enter −5 using the DATA keys and press the ENTER key.

4. Press and release the SHIFT key, then the up-arrow key to select the HI LIMIT func-

5. Enter 5 using the DATA keys and press the ENTER key.

The Hi limit and Lo limit annunciators will appear below the Avg Power measurement field.

GPIB Example

The following GPIB command also sets limits for the average power measurement. These limits will indicate if the power level is between 5 dBm.

−5 dBm and +5 dBm.

(the default is dBm).

function.

tion.

−5 dBm and

“DISP CTXT;MEAS:CDM:AVGP:LLIM -5;LLIM:STAT ON;:MEAS:CDM:AVGP:HLIM 5;HLIM:STAT ON”

The Hi limit and Lo limit annunciators will appear below the Avg Power measurement field.

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To Change the Measurement Display

To Specify Units-of-Measure for CRT Display

Most measurements, data f unctions, and ins trument funct ions allow you to s pecify which unit-of-measurement should appear on the CRT display.

1. Position the cursor in front of the present unit-of-measurement.

2. Press the key labeled with the desired unit.

Front-Panel Example

The following front-panel operation causes the Test Set to display Avg Power in units of Watts instead of dBm.

1. Press the PRESET key.

2. Press the CALL CTRL key to access the CDMA CALL CONTROL screen.

3. Move the cursor in front of the unit-of-measure for the Avg Power measurement

(dBm).

4. Press the RATIO W key. The measurement value is changed immed iately to display in Watts.

Chapter 3, Operating Overview

GPIB Example (DUNits Command)

The following GPIB c ommand causes the Test Set to display Avg Power in units

of Watts instead of dBm. The DUNits command will only change the Test Set’s displayed units, not the units used for data transfer through GPIB.

“DISP CCNT;MEAS:CDM:AVGP:DUN W”

Displayed Units DUNits Command Mnemonic GHz GHZ

MHz MHZ kHz KHZ Hz HZ % ∆ PCTDIFF V V mV MV

V UV

dBµV DBUV W W mW MW dBm DBM dBm/BW DBM db DB % PCT s S ms MS

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Chapter 3, Operating Overview

To Change the Measurement Display

To Specify Units-of-Measure for GPIB Data Transfer

GPIB Units (UNITs command) are used by t he Test Set when sending or receiving numeric values for most field settings and measurement results through GPIB. Some measurements allow a choice of GPIB Units, but changing GPIB Units has no affect on the Display Units or Attribute Units settings.

Attribute Units (AUNits command) are used by the Test Set when sending or receiving numeric values for data functions (Hi and Lo Limits, Reference, Meter, and Averaging) through GPIB. Some measurements allow a choice of Attribute Units, but changing Attribute Units has no affect on the Display Units or GPIB Units settings.

GPIB Example (UNITs command)

The following command changes the GPIB Units for the Avg Power measurement to W (dBm is the power-up default setting).

“DISP CTXT;MEAS:CDM:AVGP:UNIT W”

GPIB Example (AUNits command)

The following command changes the Attribute Units for the Avg Power measurement to W (dBm is the power-up default setting).

“DISP CTXT;MEAS:CDM:AVGP:AUN W”

After receiving this command, the Test Set will use units of Watts for data functions (such as High and Low Limits).

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Chapter 3, Operating Overview

To Change the Measurement Display

Table 2 Functions with G P IB and Attribute Units That Can Be Changed

Function

TX Power measurement W or DBM x x Average Power measurement W or DBM x x Channel Power measurement W or DBM x x Adjacent Channel Power:

Lower Ratio, Upper Ratio Lower Level, Upper Level

SINAD measurement DB or PCT x x Distortion measurement DB or PCT x x SNR measurement DB or PCT x x RF Generator Amplitude W or DBM x Frequency Error Hz x x

Available

GPIB Units

DB or PCT x x W or DBM x x

Applies to UNITs

Command

Applies to AUNits

Command

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Chapter 3, Operating Overview

To Enter and Change Values

To Enter Decimal Values

Values can be entered and changed using various methods, depending on your testing needs. The unit-of-measure for some of these fields can also be changed

see "To Specify Units-of-Measure for GPIB Data Transfer" on page 56).

(

1. Position the cursor in front of the numeric entry field to be changed.

2. Eith er:

• Enter the number and unit-of-measure directly using the keypad, or

• Press the CURSOR CONTROL knob or the ENTER key to highlight the field, and

use the knob, or

• Use the down-arrow and up-arrow keys to increment or decrement the present val-

ue.

Front-Panel Example

The following front panel operation changes Sector A Power to -73 dBm/BW.

1. Move the cursor in front of the Sector A Power field.

Enter −73 dBm using the DATA keys.

GPIB Example

The following GPIB command also changes Sector A Power to

−73 dBm/BW.

“DISP CCNT;CDMA:CELL:ASEC -73 DBM;ASEC:STAT ON”

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Page 59

To Enter and Change Values

To Enter Hexadecimal Values

Hexadecimal (Hex) values are used for entering some signaling parameters, such as MIN (Mobile Identification Number). No unit-of-measure is associated with these values.

Hexadecimal values are either entered from the keypad (using the A-F shifted functions), or by using the

Front-Panel Example

The following front-panel operation enters the Hexadecimal number #H0D2565F15 into the MIN field.

1. Move the cursor to the field below MS ID.

2. If the field currently says Phone Num press the ENTER key, use the CURSOR CON-

TROL knob to select MIN, and press th e ENTER key again. (If MIN is already s elected, proceed to step 3.)

3. Use the CURSOR CONTROL knob to select the numeric entry field below MIN.

4. Enter 0, then press and release the SHIFT key, then the 3 key (to select D), enter 2565,

press and release the SHIFT key, then the 5 key (to select F), enter 15, and then press the ENTER key. This is the hexadecimal code derived from the phone number 321-456-7890.

Chapter 3, Operating Overview

Choices menu.

GPIB Example

The following GPIB command also enters the Hexadecimal number 0D2565F15 into the MIN field.

“DISP CCNT;CDMA:MOB:MIN ‘0D2565F15’”

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Chapter 3, Operating Overview

To Enter and Change Values

To Enter Values With Exponents

Front-Panel Example

The following front-panel operation changes Confidence (limit) to 95.

1. Press the CALL CTRL key.

2. Move the cursor in front of the Confidence field.

3. Enter 9 EEX 1.

The EEX key can be used to enter values in exponential notation. Exponential notation is only allowed on floating-point entry fields.

To Increment/Decrement Values

Incrementing and decrementing values on the Test Set can be performed from the front panel with the CURSOR CONTROL knob or the up/down arrow keys., or the INCR

÷10 and INCR ×10 keys.

The INCR

÷10, INCR ×10, and INCR SET keys are used to assign a specific

increment value. To change an increment/decrement setting:

1. Move the cursor to the numeric entry field to be changed.

2. To change the current increment/decrement setting by a factor of 10, use the INCR ÷10

or INCR ×10 keys.

3. To set a specific increment/decrement value, press INCR SET, and enter the desired value.

Front-Panel Example

The following front panel operation sets the increment value on the Sector A

field to 3 dB.

Power

1. Press the CDMA SCRNS, CALL CTRL key.

2. Move the cursor in front of the Sector A Power field.

3. Press INCR SET, 3, ENTER.

4. Turn the knob or press the up/down arrow keys.

GPIB Example

The following GPIB command also sets the increment value on the Sector A

field to 3 dBm/BW, and increments the present value up by 3 dBm/BW.

Power

“DISP CCNT;CDMA:CELL:ASEC:INCR 3;INCR UP”

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Page 61

Saving and Recalling Instrument Setups

The save and recall functions allow you to store different instrument setups and retrieve them later, eliminating the task of re-configuring the Test Set.

The number of available sa ve regi sters depends on how many chan ges were made to the BASE instrument setup for each save. (See

page 64

registers that can be used (typically over 200). SAVE/RECALL register settings can be saved to several types of mass storage.

This allows you to “back up” the settings in case you need to clear them from memory (see when a firmware upgrade is performed.

To Save an Instrument Setup

1. Press and release the SHIFT key, then the PREV key to access the I/O CONFIGURE

2. Make any changes to the instrument that you want to save in a register.

3. Press and release the SHIFT key, then the RECALL key to select the SAVE function.

4. Use the DATA keys or the Save: menu at the botto m right of the screen to enter the

.) The smaller the number of changes, the greater the number of SAVE

"Memory Conside rations " on p age 64) for running lar ge programs, or

screen. Select the storage media using the Save/Recall field. (The default storage media is internal memory.)

save register name.

Chapter 3, Operating Overview

"Specifying BASE Settings" on

Front-Panel Example

This example saves the current instrument settings.

1. Press and release the SHIFT key, then the RECALL key to select the SAVE function. A prompt appears at the top of the screen asking you to enter a name.

2. Using the DATA keys, enter 123, then press the ENTER key to assign a name.

GPIB Example

The following GPIB command also SAVES the current instrument settings.

“REG:SAVE 123”

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Chapter 3, Operating Overview

Saving and Recalling Instrument Setups

To Recall an Instrument Setup

1. Press and release the SHIFT key, then the PREV key to access the I/O CONFIGURE

screen and select the media to recall settings from using the Save/Recall field. (The default is internal memory.)

2. Press the RECALL key.

3. Use the knob to select the desired setup to be recalled from the Recall menu at the

bottom right of the screen.

Front-Panel Example

This example recalls the current instru ment settings. Press RECALL, 1, 2, 3, ENTER. The saved instrument settings are recalled.

GPIB Example

The following GPIB command also recalls register 123.

“REG:REC 123”

To Clear All SAVE Registers

1. Press the RECALL key.

2. Use the knob to position the cursor in front of the entry in th e Recall menu at the

bottom right of the screen.

3. Press the knob or the ENTER key. A prompt appears at the top of the screen to verify that you want to clear all registers.

4. Press the ON/OFF key to select YES.

GPIB Example

The following GPIB command clears all registers

“REG:CLE:ALL”

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Saving and Recalling Instrument Setups

To Remove (Clear) an Individual SAVE Register

1. Specify where the register is stored using the Save/Recall field on the I/O CON-

FIGURE screen.

2. Press the RECALL key.

3. Use the knob to position the cursor in front of the register to be removed from the Re-

call menu at the bottom right of the screen. The register name and percentage of SAVE memory occupied by that register are indicated at the very top of the screen.

4. Press the ON/OFF key. A prompt appears, asking if you want to delete the save register.

5. Press the ON/OFF key to select YES. (Press the RATIO W key to select NO.)

GPIB Example

The following GPIB command clears a register

“REG:CLE ‘<quoted string>’”

Choosing Register Names

You can use any number, letter, or combination of numbers and letters as a name for storing instrumen t settin gs. For inst ance; if yo u want to save a set up for tes ting

a “Vulcan7” radio, you can save the setting as “VULCAN7”.

Chapter 3, Operating Overview

Two register names are reserved for special purposes: POWERON and BASE.

Specifying POWERON Settings

You can specify the instrument setting at power-on by following the procedure described in name POWERON. If a SAVE Register named POWERON is detected by the Test Set during its power -on rou tine, the Test Set will configure itself using the sett ings stored in the POWERON register.

NOTE: If the Test Set does not successfully complete its power-on routine because of the POWERON

settings (e.g., the Test Set displays a message that requires you to cycle power to recover) you must:

1. Turn off the Test Set.

2. Hold down the PRESET and the Hz/uV keys simultaneously.

3. Turn on power while holding the PRESET and the Hz/uV keys down until the CALL

CONTROL screen appears.

This procedure will clear all SAVE registers, including POWERON.

"To Save an Instrument Setup" on page 61, and choosing the register

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Chapter 3, Operating Overview

Saving and Recalling Instrument Setups

Specifying BASE Settings

The BASE register contains any field settings the user has SAVEd that are different from the inst rument PRESET stat e. It esta blish es a refere nce point fo r all future SAVEs. (The PRESET state is stored in the BASE register until you SAVE another instrument setup.)

When you SAVE an instrument setup, the new setup is compared to the BASE settings, and any differences are stored under the r egister name you supply. Because only differences are stored, a much larger number of instrument setups can be saved than if the contents of every field was saved.

When you RECALL an instrument setting, every field is reset to the BASE settings. The SAVED settings are then used to re-establish the de sired instrume nt setup.

You can define your own BASE setting. If your d esi re d settings are very different from the PRESET values, you may want to change the BASE register. This will decrease the amount o f memory used to SAVE each setup , and all ow you to SAVE many more setups.

CAUTION: Since each SAVE/RECALL register only contains the differences between the setup being

saved and the present BASE register settings, changing the BASE results in all other saved setups being ERASED from memory (including the POWERON setting if one has been saved).

Unless you consistently change the same fields to the same value each time you use the instrument, you should probably not create your own BASE settings.

Memory Considerations

When the Save/Recall field of the I/O CONFIGURE screen is set to

Internal, instrument setups are saved to the same non-volatile RAM used to

create RAM Disk(s) and run IBASIC programs. By saving a large number of instrument setups, you reduce the amount of RAM available to run programs. If

you get a “memory overflow” message while trying to load a program, you must clear one or more SAVE/RECALL registers to free RAM space).

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Using USER Keys

Chapter 3, Operating Overview

User keys instantly access instrument settings without using the knob. You can use USER keys to move quickly between fields on the same screen, and to access field settings that are not normally available on the screen you are using.

Local USER keys are used to move between settings on the screen that is displayed. When the USER key is pressed, the cursor instantly moves to, and selects, the assigned field; eliminating the need to turn and push the knob. Five local USER keys are available for each screen: K1, K2, K3, K4, and K5.

Global USER keys are used to ac ce ss sett ings th at are not ava ilabl e on the cur rent

screen. Three global USER keys are available: K1’, K2’, and K3’. (These are shifted functions of th e local USER keys.)

When defining USER keys, the ASSIGN fu nction is used to c reate key d efiniti ons; the RELEASE function removes the definitions. Re-assigning a USER key to a different field setting automatically Releases it from the setting it was previously associated with.

To Assign Local USER Keys

1. Move the cursor to the field you want to assign a local USER key to.

2. Press and release the SHIFT key, then the K4 key to select the ASSIGN function. Press

a local USER key (K1-K5). The USER key number appears in front of the field you assigned it to.

Example of Assigning a Local USER Key

Use this example to assign local USER key K1 to the Filter 1 field in the RX TEST screen.

1. Access the RX TEST screen and position the cursor in front of the Filter 1 field.

2. Press and release the SHIFT key, then the K4 key to select the ASSIGN function.

3. Press K1. A small 1 appears next to the field indicating that USER key K1 has been

assigned to it.

4. Move the cursor to any other field on the screen and press K1. The cursor immed iately returns to the Filter 1 field. The field is also highlighted to change the entry using the CURSOR CONTROL knob or arrow keys.

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Chapter 3, Operating Overview

Using USER Keys

To Release Local USER Keys

1. Display the screen containing the USER key assignment to be removed.

2. Press and release the SHIFT key, then the K5 key to select the RELEASE function.

3. Press the USER key (K1-K5) that you want to release.

To Assign Global USER Keys

1. Move the cursor to the field you want to assign a global USER key to.

2. Press and release the SHIFT key, then the k4 key to select the ASSIGN function.

3. Press a global USER key (K1’ -K3’). Unlike a local USER key, the USER key number

does not appear in front of the field you assigned a global USER key to. A prompt appears at the top of the screen confirming the key assignment.

Example of Assigning a Global USER Key

Use this example to assign global USER key K1’ to the AF Anl In field, and then access this field in the OSCILLOSCOPE screen.

1. Access the AF ANALYZER screen and position the cursor in front of the AF Anl In field.

2. Press and release the SHIFT key, then the K4 key to select the ASSIGN function.

3. Press and release the SHIFT key, then the K1 ’ key. Notice the promp t Global User

key 1 assigned. at the top of the screen.

4. Access the OSCILLOSCOPE screen.

5. Press SHIFT, K1’.

AF Anl Input

present input is set to FM Demod). To change the input, use the arrow keys, or press the ENTER key to access the

A field that is ac cessed usi ng a glob al USER key i s only dis played at the top of the screen while it is being accessed. Moving the cursor to any other field in the screen causes the USER key field to disappear until it is accessed again.

To Release Global USER Keys

1. Move the cursor to the field with the global USER key assigned to it.

2. Press SHIFT, K5, SHIFT, and the USER key to be released (K1’-K3’).

, FM Demod is displayed at the top of the screen (assuming the

Choices menu.

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Chapter 3, Operating Overview

Setting an RF Generator/Analyzer Frequency Offset

You can set a fixed frequency offset between the RF Generator and the RF Analyzer. At power-up and instrument preset this feature is ON with a transmit/receive frequency offset of 45 MHz.

NOTE: A 45 MHz offset is requir ed for making a call or making measurem ents in CDMA m ode.

To Turn Off RF Frequency Offset

1. Access the CONFIGURE screen.

2. Position the cursor below the RF Display field and select Freq.

3. Set the RF Offset to Off

GPIB Example

“CONF:OMOD ‘OFF’”

turns the RF frequency offset off

To Change the RF Frequency Offset

1. Access the CONFIGURE screen.

2. Position the cursor below the RF Display field and select Freq.

3. Set the RF Offset to On

4. Enter an offset frequency ((Gen)-(Anl)).

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Chapter 3, Operating Overview

Setting an RF Generator/Analyzer Level Offset

You can correct for path loss by setting up an RF Level Offset on the front-panel RF connector(s) used in your application. At power-up and instrument preset this feature is OFF with 0.0 dB loss in all connector fields.

An RF Level Offset is req uired to ensure proper power levels to the anal yzer when testing CDMA mobile stations.

Refer to “Determining and Correcting for RF Path Loss” in Calibrating th e Test

Set chapter o f the Agilent 8924C Application Guide.

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Interaction Between Screens

Most fields operate globally; changing the setting in any screen automatically changes th at setting in all screens where it is available. example of this field type.

Chapter 3, Operating Overview

AFGen1 Freq is an

AFGen1 Freq

1.000

RX TEST

AFGen1 Freq

RF GENERATOR

kHz

1.000

kHz

TX TEST

DUPLEX

Figure 6 Example of How Global Fields Work

Priority fields give the RX TEST and TX TEST screens priority control of their settings. No matter what these fields were set to in other screens, if the RX TEST or TX TEST screen is accessed, the field changes to whatever it was last set to in these screens. The RF Generator These fields and their preset values are listed in

AFGen1 Freq

1.250

kHz

DATA Keys

AFGen1 Freq

21 5 0

1.250

kHz

AFGen1 Freq

1.250

kHz

AFGen1 Freq

1.250

kHz

Amplitude is an example of this field type.

table 3 on page 70.

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Chapter 3, Operating Overview

Interaction Between Screens

Table 3 Priority RX TEST and TX TEST Fields

Priority Field RX TEST TX TEST

RF Gen Amplitude Presets to −80 dBm (changeable) Always Off AFGen1 To Presets to FM (changeable) Always Audio Out AF Anl In Always Audio In Presets to FM Demod (changeable) Detector Always RMS Presets to Pk +− Max(changeable) De-emphasis Always Off Presets to 750µs (changeable) AF Anl Measurement Presets to SINAD (changeable) Presets to Audio Freq (changeable)

Using your Test Set, duplicate the steps in figure 7 to demonstrate how the priority fields operate.

1. Access the RX TEST screen and set the

Amplitude

Amplitude to -50 dBm.

2. Access the RF GENERATOR screen and

Amplitude

set the Amplitude to -75 dBm.

3. Access the RX TEST screen. Notice that

Amplitude

the Amplitude changes back to -50 dBm.

2. Return to the RF GENERATOR screen.

Amplitude

The Amplitude is no longer where you set it in step 2 (-75 dBm).

Since the RX TEST screen has priority control over this field, the RF GENERATOR screen’s Amplitude setting changed when RX TEST was accessed.

Figure 7 Example of How Priority Fields Work

-50

dBm

- 7 5

Amplitude

-75

dBm

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Page 71

Printing A Screen

To Print A Screen’s Contents

1. Connect a printer to the appropriate rear-panel connector.

2. Press and release the SHIFT key, then the PRINT key to access the PRINT CONFIG-

URE screen and set the Printer Port field to the appropriate type of printer connection.

• If GPIB is selected, enter the GPIB Printer Address of the printer.

3. Select the type of printer you are using in the Model field. If your prin ter i s not lis ted,

configure your printer to emulate one that is listed .

4. Enter a Print Title using the knob (optional). The title will appear at the top of

your printout.

5. Display the screen you want to print and press the PRINT key.

Chapter 3, Operating Overview

To interrupt pr inting, select the Abort Print field on the PRINT CONFIGURE screen.

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Chapter 3, Operating Overview

Measurement Triggering Process

Active Measurements

Only active measurements can be triggered and then queried for a measurement result. W it hin t he Test Set, measurements are d if fer entia ted b etween those that are "active" and those tha t are "not acti ve". The defi nition of an act ive measurement is different for analog measurements than for CDMA measurements.

Definition of Active CDMA Measurement

All CDMA measurements are "active" if:

• either of the following screens is displayed on the C RT of the Tes t Set CDMA CELLULAR MOBILE RECEIVER TEST

CDMA CELLULAR MOBILE TRANSMITTER TEST

AND

• the measurement is in the ON state

NOTE: Only the Avg/Chan Power measurement is active on the CDMA CALL CONTROL screen.

Definition of Active Analog Measurement

An analog measurement is "active" if:

• the field used to display the measurement result is located on the screen which is

currently displayed on the CRT of the Test Set AND

• the measurement is in the ON state

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Page 73

Measurement Triggering Process

Triggering A Measurement Cycle

The Test Set starts a measurement cycle when a valid trigger is received. The measurement cycle is the process used by the Test Set to obtain measurement results.

The measurement cycle is a firmwar e proce ss which , for all acti ve measur ements, obtains raw data from the hardware and then proce sses/for mats the raw data into a measurement result. The result is then displayed on the screen, and - if operating in remote mode - sent to the GPIB bus.

The measurement cycle completes when a valid measurement result is obtained for all active measurements.

Trigger Modes

The trigger mode used to start the meas ur ement cycl e can be se le cted by the user . The trigger mode is defined by two parameters: retriggering and settling.

Chapter 3, Operating Overview

Retriggering

Retriggering refers to what the measurement cycle does once it has completed (obtained a valid measurement result for all active measurements). There are two options:

1. Single retriggering causes the measurement cycle to stop once a valid measurement re-

sult has been obtained for all active measurements. A valid trigger must be received to start the measurement cycle again. When a measurement cycle is completed, the values for all active measurements are held until another trigger is received.

2. Repetitive retriggering causes the measurement cycle to automatically start over once

a valid measurement result has been obtained for all active measurements. No trigger must be received to start the measurement cycle again. Repetitive retriggering will cause measurements that rely on external signals or hardware generated events (such as Traffic Rho) to be automatically re-armed upon completion of a measurement cycle.

NOTE: The Cont selection in the Meas Cntl field is equal to repetitive retriggering.

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Chapter 3, Operating Overview

Measurement Triggering Process

Settling

Settling refers to the amount of ti me del ay introduced into the measurement cycle to allow signal transients to propagate through the analysis chain and settle out. There are two options:

1. Full settling introduces the appropriate delay for all signal transients which might have

occurred at the front panel coincident with the trigger command, to pass through the analysis chain and settle out. Delays are also inserted to allow for internal hardware transients to settle.

2. Fast settling introduces no delay for internal or external signal transients to settle.

There will still be delays introduced by the couplings bet w een autotuning and autoranging. If the operator wishes to remove these delays as well, all autoranging and autotuning functions must be turned OFF and the operator must explicitly set the ranging amplifiers and the frequency tuning. Delays introduced by the measurement processes themselves cannot be eliminated.

NOTE: CDMA measurements are not affected by the trigger mode settling parameter. CDMA

measurements are made with a digital signal processor (DSP) which does not require the settling times associated with analog hardware circuitry.

Rho Suite of Measurements

The following group of CDMA measurements is referred to as the "Rho Suite of Measurements" because a result for each of the following measurements is available each time the Rho Suite of measurements is triggered:

Traffic Rho or TM Rho (only one can be selected) Frequency Error Amplitude Er ror Time Offset Phase Error Carrier Feedthrough

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Measurement Triggering Process

Default Trigger Modes

Default Trigger Mode for Remote Operation: CDMA and Analog Measurements

Upon powerup, or upon receiving a *RST command, or upon pressing the front

panel PRESET key, the Test Set’s default trigger mode for remote operation of both CDMA and analog measurements is Repetitive settling.

If a local-to-remote transition occurs, the trigger mode will be set to the last trigger mode command received while in remote mode. If no trigger mode command has been received since powerup, the default state is set.

Default Trigger Mode for Local Operation: CDMA Measurements

Upon powerup, or upon receiving a *RST command, or upon pressing the front panel PRESET key, the Te st Set’s default trigger mode f or front panel op eration of the FER and Rho Suite of Measurements is Single retriggering.

If a remote-to-local transition occurs, the trigger mode will be determined by:

Chapter 3, Operating Overview

retriggering with Full

•FER - the st ate of the Meas Cntl field on the CDMA CELLULAR MOBILE

RECEIVER TEST screen

Rho Suite of Measurements - the state of the Meas Cntl field on the CDMA

•

CELLULAR MOBILE TRANSMITTER TEST screen

NOTE: Setting the Meas Cntl field to Cont (Continuous) sets the trigger mode to repetitive

retriggering.

Upon powerup, or upon receiving a *RST command, or upon pressing the front

panel PRESET key, or upon a remote-to-local transition the Test Set’s default trigger mode for front panel operation of the Avg/Chan Power measurement is

Repetitive retriggering.

Default Trigger Mode for Local Operation: Analog Measurements

Upon powerup, or upon receiving a *RST command, or upon pressing the front panel PRESET key, the Te st Set’s default trigger mode f or front panel op eration of analog measurements is Repetitive

retriggering with Full settling.

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Chapter 3, Operating Overview

Triggering Analog Measurements In Local Mode (Front Panel Operation)

1. Select the desired trigger mode.

For Signaling Decoder

• Continuous - Once a measurement has completed, the Test Set is internally re-

triggered and another measurement cycle begins.

• Single - Requires selection of the Arm Meas field to be begin a measurement cycle.

Manual Operation:

1. Position the cursor at the Single/Cont field.

2. Press the knob to underline the desired mode.

SIGNALING DECODER

Arm Single/Cont

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Triggering Analog Measurements In Local Mode (Front Panel Operation)

Chapter 3, Operating Overview

For Analog Measurements (other than Signaling Decoder)

• Repetitive retriggering is the only trigger mode available from the front panel for

analog measurements (other than the Signaling Decoder). Single trigger mode can be simulated using the Test Set’s measurement hold feature. Selecting the HOLD key causes all currently displayed measurement results to be held on the screen an d stops the measurement cycle. To resume making measurements press the HOLD key again.

Manual Operation:

1. Press then release the SHIFT key, then press the MEAS RESET key to HOLD measurement results.

2. Select HOLD again to return to Repetitive mode.

CDMA CALL CONTROL

CDMA SCRNS

CELL CALL CTRL

SPECTRUM

GEN CTRL

ANALOG SCRNS

ENCODER

ANL

SPEC ANL

GEN

END

CALL

RANGE

TEST

MSRPT

TEST

DECODER

RX TEST ACP

TEST

SCOPE DUPLEX

CALL ANS

USER DATA

k1’

k2’

k3’

ASSIGN

RELEASE

FUNCTIONS

MSG

PRINTER

HELP

DATA FUNCTIONS

REF SET

METER

INCR

: 10

SET

LO LIMIT HI LIMIT

CURSOR CONTROL

CANCELSHIFT

INCR X10

Meas Reset begins a measurement cycle, interrupting any measurement in progress.

I/O CONFIG CONFIG

PREV TESTS

AVG

PUSH TO

SELECT

INSTRUMEN T STATE

ADRS

SAVE

LOCAL

RECALL

789

456 123

YES

Ω

ppm

ON/OFF

dBµV

AUDIO OUTSQUELCHVOLUMEMIC/ACC

MAX

12 v Pk

HOLD

MEAS

PRESET

RESET

MEMORY

CARD

ENTER

GHz dBm

MHz

kHz

ms Hz

AUDIO IN

LOHI

MAX

42 v Pk

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Chapter 3, Operating Overview

Triggering Analog Measurements In Local Mode (Front Panel Operation)

2. Trigger the Signaling Decoder (applies if trigger mode is "Single")

Manual Operation:

1. Position the cursor at the Arm Meas field.

SIGNALING DECODER

Arm Meas Single/Cont

2. Press the knob.

Arming the Signaling Decoder as shown in this example will cause the measurement to be automatically triggered by an internal trigger command.

Selecting the Stop Meas field will stop the currently executing measurement cycle for the Signaling Decoder.

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Chapter 3, Operating Overview

Triggering CDMA Measurements In Local Mode (Front Panel Operation)

1. Select the desired trigger mode.

For FER and Rho Suite of Measurements

Manual Operation:

1. Position the cursor at the Single/Cont field.

2. Press the knob to underline the desired mode.

• Continuous - Once a measurement has completed, the Test Set is internally retriggered and another measurement cycle begins.

• Single - Requires selection of the Arm field to be begin a measurement cycle.

CDMA CELLULAR MOBILE RECEIVER TEST

Test Status

Connected Svc Opt 2 Tes t i n g Passed Failed Max Frames

Meas Cntl

Single/Cont Arm Disarm

Max Frames

On/Off

Confidence

95.00

FER Specs

3.00

Display Interim Results

Yes /No

Traffic Data Mode

Svc Opt 1

Data Rate

Full

Eb/Nt

----

FER

Errors Counted Frames Counted

Sector A Power

-75.0

dBm/BW

Traffic

15.6

AWGN

-75.0

dbm/BW

To Screen

CDMA

CALL CNTL

Analog

RX TEST

Cnfig

PRNT CNFG

When Single is selected, the Arm and Disarm fields are displayed. When Continuous is selected the Arm and Disarm fields will not appear.

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Chapter 3, Operating Overview

Triggering CDMA Measurements In Local Mode (Front Panel Operation)

For Avg Power and Chan Power measurements

• Repetitive retriggering is the only trigger mode available from the front panel for the Avg Power and Chan Power measurements. Single trigger mode can be simulated using the Test Set’s measurement hold feature. Selecting the HOLD key causes all currently displayed measurement results to be held on the screen and stops the measurement cycle. To resume making measurements press the HOLD key again.

Manual Operation:

1. Press then release the SHIFT key, then press the MEAS RESET key to HOLD measurement results.

2. Select HOLD again to return to Repetitive mode.

CDMA CALL CONTROL

CDMA SCRNS

CELL CALL CTRL

SPECTRUM

GEN CTRL

ANALOG SCRNS

ENCODER

ANL

SPEC ANL

GEN

END

CALL

RANGE

TEST

MSRPT

TEST

DECODER

RX TEST ACP

TEST

SCOPE DUPLEX

CALL ANS

USER DATA

k1’

k2’

k3’

ASSIGN

RELEASE

FUNCTIONS

MSG

PRINTER

HELP

DATA FUNCTIONS

REF SET

METER

INCR

: 10

SET

LO LIMIT HI LIMIT

CURSOR

CONTROL

CANCELSHIFT

I/O CONFIG CONFIG

AVG

INCR X10

PUSH TO

SELECT

Meas Reset begins a measurement cycle, interrupting any measurement in progress.

PREV TESTS

INSTRUMEN T STATE

ADRS

SAVE

LOCAL

RECALL

789

456 123

YES

Ω

ppm

ON/OFF

dBµV

AUDIO OUTSQUELCHVOLUMEMIC/ACC

MAX

12 v Pk

HOLD

MEAS

PRESET

RESET

MEMORY

CARD

ENTER

GHz dBm

MHz

kHz

ms Hz

AUDIO IN

LOHI

MAX

42 v Pk

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Chapter 3, Operating Overview

Triggering CDMA Measurements In Local Mode (Front Panel Operation)

2. Trigger the FER and Rho Suite Measurements (applies if trigger mode is "Single")

Manual Operation:

1. Position the cursor at the Arm field.

2. Press the knob.

Test Status

Meas Cntl

Single/Cont Arm Disarm

CDMA CELLULAR MOBILE RECEIVER TEST

Connected Svc Opt 2 Tes t i n g Passed Failed Max Frames

Max Frames

On/Off

Confidence

FER Specs

Display Interim Results

Yes /No

95.00

3.00

Traffic Data Mode

Svc Opt 1

Data Rate

Full

Eb/Nt

FER

Errors Counted Frames Counted

----

Sector A Power

-75.0

dBm/BW

Traffic

15.6

AWGN

-75.0

dbm/BW

To Screen

CDMA

CALL CNTL

Analog

RX TEST

Cnfig

PRNT CNFG

Arming the FER measurement as shown in this example will cause the measurement to be triggered by an internal trigger event. The Rho suite of measurements operate similarly.

Selecting the Disarm field will stop the currently executing measurement cycle for the FER or Rho Suite of Measurements.

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Chapter 3, Operating Overview

Triggering Analog Measurements In Remote Mode (GPIB Operation)

1. Select the desired trigger mode.

• Retriggering

• Repetitive - Once a measurement cycle has completed

the Test Set is automat-

ically re-triggered and another measurement cycle begins. When the trigger mode is set to repetitive retriggering, consecutive queries of the

same measurement return new measured values.

• Single - Once a measurement cycle has completed the Test Set requires an GPIB trigger command be received to begin a new measurement cycle.

When the trigger mode is set to single retriggering, consecutive queries of the same measurement (with no intervening trigger) will return the same value. Measurements that rely on external signals or hardware-generated events (such as Traffic Rho) must be re-armed with a new trigger before another measurement can be made.

• Settling

• Full - Appropriate time delays introduced into measurement cycle to allow internal or external signal transients to settle.

• Fast - No time delay introduced into measurement cycle to allow internal or ex- ternal signal transients to settle.

The programmer must account for transient settling before issuing a trigger command.

There will still be delays introduced by the couplings bet w een autotuning and autoranging. If the programmer wishes to remove these delays as well, all autoranging and autotuning func tions must be turn ed OFF and the prog ram must expl icitly set the ranging amplifiers and the frequency tun ing. Delays introduced by the measurement processes themselves cannot be eliminated.

GPIB Syntax|

"TRIG:MODE:RETR REP" !selects Repetitive retriggering mode. "TRIG:MODE:RETR SING" !selects Single retriggering mode. TRIG:MODE:SETT FULL" !selects Full settling mode. "TRIG:MODE:SETT FAST" !selects Fast settling mode.

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Chapter 3, Operating Overview

Triggering Analog Measurements In Remote Mode (GPIB Operation)

2. Trigger all active analog measurements (applies if trigger mode is "Single")

GPIB Syntax

"TRIG" !triggers all active analog measurements.

GPIB Example Program

10 OUTPUT 714;"DISP RFAN" 20 OUTPUT 714;"TRIG:MODE:RETR SING;SETT FULL" 30 OUTPUT 714;"TRIG" 40 END

GPIB Example Program Comments By Line

10 !Selects RF Analyzer screen

20 !Sets the Test Set’s remote trig ger mode to Single retriggering and Full settling 30 !Triggers all active analog measurements

Preventing GPIB Bus Lockup

GPIB bus lockup is a condition where the GPIB bus and the Active Controller handshake are in a temporary holdoff state while the Active Controller waits to read the measurement result from the Test Set. If a measurement cycle does not successfully obtain a valid measurement result, it will continue to try until it does or until th e m easurement trigger is aborted. This is true for both retriggering modes. Thi s has the consequence of putting the GPIB in the lockup state.

The control program should include measurement time-out routines that CLEAR the bus and ABORt the trigger if a measurement does not complete within a specified amount of time. This provides a method of preventing the bus from remaining in the temporary holdoff state indefinitely.

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Chapter 3, Operating Overview

Triggering CDMA Measurements In Remote Mode (GPIB Operation)

1. Select the desired trigger mode.

• Retriggering

• Repetitive - Once a measurement cycle has completed ically re-triggered and another measurement cycle begins.

When the trigger mode is set to repetitive retriggering, consecutive queries of the same measurement return new measured values.

NOTE: Since the default trigger mode for remote operation is Repetitive, as soon as the Test Set is put

into remote mode (a local-to-remote transition) the Test Set will begin to make measurements whether a signal is present or not. If no signal is present, then signal processing error messages will be displayed on the CRT of the Test Set.

• Single - Once a measurement cycle has completed the Test Set requires an GPIB trigger command be received to begin a new measurement cycle.

NOTE: CDMA measurements are not affected by the trigger mode settling parameter. CDMA

measurements are made with a digital signal processor (DSP) which does not require the settling times associated with analog hardware circuitry.

the Test Set is automat-

GPIB Syntax

"TRIG:MODE:RETR REP" !selects Repetitive retriggering mode. "TRIG:MODE:RETR SING" !selects Single retriggering mode.

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Triggering CDMA Measurements In Remote Mode (GPIB Operation)

2. Trigger all active CDMA measurements

GPIB Syntax

"TRIG" !triggers all active CDMA measurements.

GPIB Example Program

10 OUTPUT 714;"DISP CRXT" 20 OUTPUT 714;"TRIG:MODE:RETR SING" 30 OUTPUT 714;"TRIG" 40 END

GPIB Example Program Comments By Line

10 !Selects CMDA CELLULAR MOBILE RECEIVER TEST screen

20 !Sets the Test Set’s remote trigger mo de to Single retriggering 30 !Triggers all active CDMA measurements

Chapter 3, Operating Overview

Preventing GPIB Bus Lockup

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Chapter 3, Operating Overview

Increasing Measurement Throughput

This section contains a number of techniques for increasing measurement throughput. These techniques include:

"Performing Transmitter and Receiver testing concurrently" on page 86 "Minimizing bus configuratio n ti me" on page 90 "Reducing delays caused by screen changes" on page 93 "Reducing delays caused by unused measurements" on page 92 "Reducing measurement setup time" on page 93

Performing Transmitter and Receiver testing concurrently

During an FER test, the Test Set is capable of executing GPIB commands and returning measuremen t results fro m other measurement functions, such as Rho.

Programming Example

The following example assumes a Service Option 2 call is Connected. The program begins an FER measurement and allows an operator to query rho while the FER frame count continues.

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Increasing Measurement Throughput

10 ! re-save "i:\dept\cdma\ex_progs\simultan" 20 ! REV A.01.00 30 ! 40 ! This program demonstrates simultaneous FER (receiver sensitivity) 50 ! and rho (transmitter modulation quality) testing. After an FER 60 ! test is started, a softkey interrupt branches program execution 70 ! to a subprogram that queries rho and prints a test result without 80 ! interrupting the FER test. 90 ! 100 Loss=-3 110 CLEAR SCREEN 120 ! Set up a timeout to regain control of the bus in the event an error 130 ! such as "Query unterminated" occurs. 140 ON TIMEOUT 7,5 GOTO End_of_prog 150 Initialize_ts(Loss) !Preset the Test Set 160 Page_phone !Attempt a call (the mobile must be registered) 170 ! Set triggering mode to continuous. THIS IS REQUIRED FOR 180 ! SIMULTANEOUS MEASUREMENTS. 190 OUTPUT 714;"TRIG:MODE:RETR REPETITIVE" 200 Start_fer !Start an FER test 210 ! Set up a softkey to query rho measurement 220 USER 1 KEYS !Selects User 1 softkey definitions on ITF keyboard, normal mode 230 ON KEY 1 LABEL "rho",15 CALL Measure_tx_qual 240 PRINT "" 250 PRINT "Press softkey F1 to make a rho measurement" 260 PRINT "" 270 LOOP 280 DISABLE !Disables interrupt while output/enter 290 OUTPUT 714;"meas:cdm:fer:fram?;err?" 300 ENTER 714;Frames_counted,Errors_counted 310 ENABLE !Enables keyboard interrupt allowing branch to rho meas 320 DISP "Frames Counted =";Frames_counted;"Errors Counted =";Errors_counted 330 END LOOP 340 OUTPUT 714;"CDMA:CALL:END" 350 OUTPUT 714;"TRIG:MODE:RETR SINGLE" 360 Clear_bus: ! Clears the bus in case of query unterminated or query interrupted 370 CLEAR 714 380 ERROR RETURN

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Chapter 3, Operating Overview

Increasing Measurement Throughput

390 DISP "PROGRAM DONE" 400 End_of_prog: !Branch here if timeout occurs 410 END 420 ! 430 Page_phone: SUB Page_phone 440 OUTPUT 714;"CDMA:CELL:ASEC:BWP -50 dBm;STAT ON" 450 OUTPUT 714;"CDMA:RFCH 384" ! 460 PRINT "WHEN THE MOBILE FINDS SERVICE AND HAS REGISTERED, PRESS THE CONTINUE SOFTKEY (F2)" 470 DISP "Waiting..." 480 PAUSE 490 OUTPUT 714;"CDMA:CALL:TRAF:DATA:MODE ’SVC OPT 2’" 530 OUTPUT 714;"CDMA:CALL:MAKE" 540 DISP "Mobile is being paged..." 550 ! The following loop will continue until the CDMA Event register 560 ! indicates that the phone has ’Connected’ 590 REPEAT 600 WAIT .1 !100 mS wait to allow Test Set to handle other tasks 610 OUTPUT 714;"STAT:CDMA:EVENT?" 620 ENTER 714;Event_reg 690 UNTIL BIT(Event_reg,3)! Monitoring "Connected" annunciator bit 700 CLEAR SCREEN 710 PRINT "Page successful, mobile is connected" 720 SUBEND 73 0 Initialize_ts: SUB Initialize_ts(Loss) 740 CLEAR 714 750 CLEAR SCREEN

760 DISP "Initializing...."

770 OUTPUT 714;"*RST"! Reset 780 WAIT 5 790 OUTPUT 714;"CONF:OFL:MODE ’ON’;RFIN ";Loss! External Path Loss 800 SUBEND 810 Measure_tx_qual: SUB Measure_tx_qual 820 ! This routine measures transmitter rho while FER is running 830 PRINT "" 840 PRINT "Measuring rho..." 850 OUTPUT 714;"MEAS:CDM:RHO?" 860 ENTER 714;Rho

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Chapter 3, Operating Overview

Increasing Measurement Throughput

870 PRINT "Rho is ";Rho 880 ! At this point, program execution will return to the loop 890 ! in the main program that displays FER results.

900 SUBEND910 Start_fer: SUB Start_fer ! Frame Error Rate Test 920 ! This sets up the parameters and arms the FER test. 950 OUTPUT 714;"DISP CRXTEST" 960 OUTPUT 714;"MEAS:CDM:FER:STAT ON" 980 OUTPUT 714;"DISPLAY:FER:INTERIM:RESULTS 'Yes'" 990 SUBEND

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Chapter 3, Operating Overview

Increasing Measurement Throughput

Minimizing bus configuration time

Every time a BASIC or IBASIC OUTPUT or ENTER statement is executed, the bus (GPIB) has to be configured for data transfer. Using compound GPIB statements minimizes bus configuration time by combining several operations into one GPIB OUTPUT or ENTER statement.

To combine multiple GPIB commands into one OUTPUT statement, use the ; (semicolon) separator and/or the ;: (semicolon colon) separator.

NOTE: It may be helpful to add the common command *OPC following a compound GPIB command.

The *OPC command is used to synchronize the control program with the Test Sets’ operating state. For a description of the *OPC command, refer to the GPIB Co mmon Commands chapt er of the Agilent 8924C Condensed Programming Reference Guide.

"Using the semicolon in compound OUTPUT st atements" on page 90 "Using the semicolon-colon in compound OUTPUT statements" on page 90 "Reading multiple values using one ENTER statement" on page 91

Using the semicolon in compound OUTPUT statements

The following example sets the Traffic Data Mode to Servi ce Option 2 and th e Data Rate to Full. The semicolon separator causes the GPIB command parsor to back up one level in the command hierarchy.

The following example...

• 10 OUTPUT 714;"CDMA:CALL:TRAFFIC:DATA:MODE ’Svc Opt 2’", and

• 20 OUTPUT 714;"CDMA:CALL:TRAFFIC:DATA:RATE ’Full’"

could be replaced with:

OUTPUT 714;"CDMA:CALL:TRAFFIC:DATA:MODE ’Svc Opt 2’;RATE ’Full’"

Using the semicolon-colon in compound OUTPUT statements

The following example sets the Sect or A Power level to -70 dBm, then attemp ts to make a call. The semicolon-colon separator causes the GPIB command parsor to back up to the top level in the command hierarchy.

OUTPUT 714;"CDMA:CELL:ASECTOR:BWPOWER -70 DBM;:CDMA:CALL:MAKE"

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Increasing Measurement Throughput

The following example...

• 10 OUTPUT 714;"CDMA:CELL:ASECTOR:BWPOWER -70 DBM", and

20 OUTPUT 714;"CDMA:CALL:MAKE"

•

could be replaced with:

OUTPUT 714;"CDMA:CELL:ASECTOR:BWPOWER -70 DBM;:CDMA:CALL:MAKE"

Reading multiple values using one ENTER statement

The following two lines of code query the Test Set for an Average Power measurement and the Average Power GPIB units, then read both of these values into the two variables Average_power and Units$.

The following example...

• 10 OUTPUT 714;"MEAS:CDMANALYZER:AVGPOWER?",

• 20 ENTER 714;Average_power

• 30 OUTPUT 714;"MEAS:CDMANALYZER:AVGPOWER:UNITS?",

• 40 ENTER 714;Units$

Chapter 3, Operating Overview

could be replaced by:

10 OUTPUT 714;"MEAS:CDMANALYZER:AVGPOWER?;AVGPOWER:UNITS?" 20 ENTER 714;Average_power,Units$

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Chapter 3, Operating Overview

Increasing Measurement Throughput

Reducing delays caused by unused measurements

When a measurement cycle is trigg ered, the Test Set will attempt to obtain a value for all active measurements. For instance, in CDMA mode (invoked when any CDMA screen is selected) the power measurement that is currently selected

(Average Power or Channel Power) is active by default. However, let’s assume you are currently me asuring r ho and do n ot need t he power meas urement. You can greatly speed up the rho measurement by turning off the power measurement.

Turning off Average Power and Channel Power measurements

The following example turns off both Average and Channel power using a compound GPIB statement:

OUTPUT 714:”MEAS:CDM:AVGP:STATE OFF;:MEAS:CDM:CHAN:STAT OFF”

Conversely, lets assume you are making a power measurement and do not need rho or any of the rho suite of measurements.

Turning off the Rho suite of measurements

The following example turns off all rho measurements:

OUTPUT 714:”MEAS:CDM:RHO:STATE OFF”

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Increasing Measurement Throughput

Reducing delays caused by screen changes

Each time the scree n bei ng displayed on the Test Set (active screen) is changed, it takes approximately 250 ms t o access and draw th e new screen. Addition ally, each time a field on the active screen is changed it takes a finite amount of time to update the field. This update time depends on the length and type of field.

When the Test Set is operated remotely, it is possible to display a special “remote screen.” When the remote screen is displayed, the active screen is never changed.

When the remote screen is being displayed, the Test Set’s display is in the “locked” state. When the control program on the external controller unlocks the display, the screen is retu rned to the last remote screen requested. T he *RST Common Command will place the Test Set’s display screen in the “unlocked” state. Pressing the [LOCAL] key causes a locked Test Set display session to end and causes the Test Set’s display screen to return to the unlocked state.

To Lock the Test Set’s Display Screen.

Chapter 3, Operating Overview

Use the :SPECial:DISPlay ’LOCKED’|’UNLOCKED’ commands to lock and

unlock the Test Set’s display screen.

Syntax

:SPECiaL:DISPlay ’LOCKED’ :SPECiaL:DISPlay ’UNLOCKED’

Example

OUTPUT 714;"SPEC:DISP ’LOCKED’"

locks the Test Set’s display screen.

NOTE: SPECial:DISPlay 'LOCKED'|'UNLOCKED' must not be invoked from the Test Set’s built-in

IBASIC Controller. Executing these commands from an IBASIC program can produce unexpected results and is not suppor ted.

Reducing measurement setup time

Measurement setup time can be mini mized by specifying an inst rumen t ope rating state in the BASE register. This approach works in conjunction with SAVE/ RECALL registers to minimize th e number of instrument settings that have to change when recalling an inst rument st ate. Refe r to

page 64

for a description.

"Specifying BASE Settings" on

Page 94

Chapter 3, Operating Overview

Passing Instrument Control

Communications on the GPIB bus are accomplished according to a precisely defined set of rules (IEEE 488.1 and 488.2 Standards). Communication (data transfer) is accomplished by designating one device to be a talker (source of data or commands) and designating one or more devices to be listeners (receivers of data or commands). The devi ce on th e bus responsible for design at ing tal kers and listeners is the Controller.

The structure of the GPIB bus allows for more than one Controller to be connected to the bus at the same time. As a means of ensuring that orderly communications can be established on power-up or when communications have failed, the rules s tate t hat on ly one Con troll er ca n uncondi tiona lly de mand cont rol of the bus (through the IFC line). This controller is referred to as the System Controller. There can be only one System Controller connected to the bus at any time.

As a means of ensuring orderly communications in environments where more than one controller is connect ed to the bus, t he rules state th at onl y one Contro ller can be actively addressing talkers and listeners at any given time. This device is referred to as the Activ e Controller. The System Controll er is the default Active Controller on power-up or after a bus reset. Controllers which are not the Active Controller are referred to as Non-Active Controllers. The Active Controller can pass control of device addressing to one of the Non-Active Controllers. Additional ly, Non-Active Contro llers can request control from the Active Controller.

The process by which the Active Controller passes device addressing responsib ility to a Non-Active Controller is referred to as Passing Control. The Active Controller must first address the prospective new Active Controller to Talk, after which it sends the Take Control Talker (TCT) message across the bus. If the other Controller accepts the message it assumes the role of Active Controller and the previous Active Controller becomes a Non-Active Controller.

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Passing Instrument Contr ol

The Test Set has bus control capability (Active/Non-Active Controller). Additionally the Test Set can be also be configur ed as the Syst em Controller. By definition then, the Test Set has the capability to demand control, pass control, accept control, and r equest con trol of t he bus depe nding upon i ts config uration, it s current operating mode, and the system configuration. Many possibilities for passing control among several controllers on the same bus exist. Attempting to identify all the possible techniques of passing control in such a system is beyond the scope of this document (refer to the IEEE 488.1 and 488.2 Standards for additional information).

Configuring the Test Set as the System Controller

To configure the Test Set as a System Controller, select the I/O CONFIGURE screen, position the cursor to the highlight the

Choices menu. As a consequence of setting the Test Set to be the System

Controller it will also become the Active Controller. The letter C appears in the upper-right corner of the display to indicate that the Test Set is now the Active Controller.

Mode field by pushing the Rotary Knob, select Control from the

Chapter 3, Operating Overview

Mode field using the Cursor Control knob,

If the T es t Set is the onl y contro ller on the bu s it must be confi gured as the Sys tem Controller. If the Test Set is not the onl y cont rolle r on th e bus, th en whethe r or no t it is configured as the System Controller would depend upon three issues:

1. whether or not other controllers have System Controller capability

2. which controller will be the Active Controller upon power-up

3. which Controller will be monitoring the bus to determine if communications

have failed (only the System Contr oller can uncondi tionally demand contr ol of the bus and reset it to a known state using the IFC line)

Ensure that only one Controller connected to the bus is configured as the System Controller or bus conflicts will occur.

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Chapter 3, Operating Overview

Passing Instrument Control

When Active Controller Capability is Required

The Test Set must be the Active Controller on the bus under the following conditions:

1. whenever the Test Set needs to control any device connected to the GPIB bus, such as

an external disk drive, an external printer, or an external instrument

2. whenever a screen image is printed to an external GPIB printer

whenever an instrument conf igur ation i s sav ed or recal led fr om an ext ernal GPIB dis k

drive

whenever running any Agilent 11807 Radio Test Software package which uses an

external GPIB device such as a disk drive, a printer, or an instrument

whenever running any IBASIC p rogram which us es an extern al GPIB devi ce such as a

disk drive, a printer, or an instrument

Passing Control Back to Another Controller

The Test Set has two methods of passing control back to another controller: 1)

automatically and 2) using the IBASIC PASS CONTROL command from an

IBASIC program. The two methods are described in the following sections.

Passing Control Back Automatically

The Test Set will automatically pass control back to the controller whose address was specified in the *PCB Common Command or to a default address of 0 (decimal) if no *PCB command was received. Control will automatically be passed under the following conditions:

Test Set is the Active Controller and an IBASIC Program is Running

• The IBASIC program running in the Test Set is PAUSED.

•The IBASIC program running in the Test Set finishes executin g.

•An IBASIC RESET occurs while the IBASIC program is running.

•Control is passed back immediately if the System Controller executes a bus reset (IFC).

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Passing Instrument Contr ol

Chapter 3, Operating Overview

Test Set is the Active Controller and no IBASIC Program is Running

•Control will be passed back within 10 seconds of receiving bus control if no co ntroller commands are executed (such as printing a screen image to an GPIB printer or saving/recalling an instrument configuration from an GPIB disk drive).

•Control is passed back immediately if the System Controller executes a bus reset (IFC).

•Control is passed back at the completion of a controller command (such as printing a screen image to an GPIB printer or saving/recalling an instrument configuration from an GPIB disk drive).

Passing Control Back Using IBASIC PASS CONTROL Command

The Test Set will pass contro l back to another Controller when the IBASIC PASS CONTROL command is issued while an IBASIC program is running on the buil t in IBASIC Controller. Refer to the

HP Instrument BASIC User’s Handbook for a

complete description of the IBASIC PASS CONTROL command.

Passing Control to the Test Set

Control is passed to the Test Set when it is addressed to TALK and then receives the Take Control Talker (TCT) command. The programming or controller command which implements the pass control protocol as outlined in the IEEE

488.1 and 488.2 Standar ds is language/co ntroller spe cific. Refer to the appropriate language/controller documentation for specific implementations.

Before passing control to the Test Set the Active Controller should send the Test Set the address to use when passing control back. This is accomplished using the *PCB Common Command. The *PCB command tells the Test Set which address should be used when passing control back to another bus controller. Before passing bus control to the Test Set, the currently active controller can use the *PCB command to tell the Test Set where to send the Take Control (TCT) command when the Test Set is ready to give up active control of the bus. The command is followed by a number which contains the bus address of the device that should become the next active controller. The number must round to an integer in the range 0 to 30 decimal. The command may be followed by two numbers. The first will be used as the primary address, the second as the secondary address of the next active controller.

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Chapter 3, Operating Overview

Passing Instrument Control

Requesting Control using IBASIC

The Test Set has the capability to request control of the bus from the Active Controller from a running IBASIC program using the IBASIC command EXECUTE ("REQUEST_CONTROL"). When the EXECUTE ("REQUEST_CONTROL") command is executed from a running IBASIC

program, the Request Control bit, bit 1, of the Test Set’s Standard Event Status Register is set to the TRUE, logic 1, condition. The Active Controller detects the request in the Test Set’s Standard Event Status Register either as a result of an SRQ indication by the Test Set or by some polling routine which periodically checks bit 1 of the Standard Event Status Register of all potential controllers on the bus. The Active Controller would then send the Test Set the address to which the Test Set is to later pass control using the *PCB Common Command. The Active Controller would then pass control to the Test Set.

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Passing Instrument Contr ol

Pass Control Examples

The following examples illustrate how pass control could be implemented in two of the common Test Set operating configurations:

1. Test Set controlled by an external controller, and

2. Test Set running an IBASIC program with an external Controller connected to GPIB

Passing Control While the Test Set is Controlled by an External Controller

This example illustrates passing control between the Test Set and an external controller w hile the Test Set is being controlled by the external controller. In this mode the Test Set is NOT configured as the System Controller. Generally speaking, in this mode of operation the Test Set is considered just another device on the GPIB bus and its Controller capabilities are not used. However, it may be desirable, under certain conditions, to print a Test Set screen to the GPIB printer for documentation or progra m debugging purpo ses. W it h manual inter vention it is possible to have the Active Controller pass control to the Test Set, have the operator select and print the desired screen, and then pass control back to the formerly Active Controller. The following steps outline a procedure for accomplishing this task.

Chapter 3, Operating Overview

bus.

This example is based upon having an HP 9000 Series 300 Workstation as the external controller connected to the Test Set through the GPIB bus. Further, it assumes that the GPIB interface in the HP 9000 Controller is set to the default select code of 7 and address of 21.

1. If a program is running on the HP 9000 Workstation, PAUSE the program.

2. Pu t the Test Set in local mode (press the LOCAL key on the front panel).

3. Configure the Test Set to print to the GPIB printer using the PRINT CONFIGURE

screen.

4. Configure the Test Set to display the screen to be printed.

5. From the keyboard of the HP 9000 Workstation type in an d execute the following co m-

mand:

OUTPUT 714;"*PCB 21"

This command tells the Test Set the address of the Controller to pass control back to.

6. From the keyboard of the HP 9000 Workstation type in an d execute the following co m-

mand:

PASS CONTROL 714

This command passes control to the Test Set.

7. Pu t the Test Set in local mode (press the LOCAL key on the front panel).

8. Press SHIFT, then TESTS on the front panel of the Test Set to print the screen.

9. After the Test Set finishes printing the screen it will automatically pass control back to

the HP 9000 Workstation.

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Chapter 3, Operating Overview

Passing Instrument Control

Passing Control Between an External Controller and the Test Set with an IBASIC Program Running

The following example program illustrates the passing of control between an external Controller and the Test Set while an IBASIC program is running in the Test Set. The example is based upon having an HP 9000 Series 300 Workstation as the external contr olle r connec ted to the Test Set through the GPIB bus. Fur ther, it is based on the assumption that the GPIB interface in the HP 9000 Contro ller is set to the default select c ode of 7 and address o f 21. In th is examp le, the Test Set is NOT configured as the System Controller. This example illustrates the situation where the External Controller would perform the functio ns listed below.

1. Sends commands to the Test Set to cause a program to be loaded off of a Memory Card

2. Sends commands to the Test Set to run the program just loaded.

3. Passes control to the Test Set and then does other work while the Test Set is making

which is in the Test Set’s front panel Memory Card slot.

measurements. When the Test Set is finished making measurements and has data available for the

External Controller, it passes control back to the External Controller.

The External Controller then requests the data from the Test Set.

100

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Agilent 8924C User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Getting Started

Before Connecting a Radio

Accessing the Test Set’s Screens

CDMA and Analog Modes

Functions Screens

Cursor Control

Changing A Field’s Setting

Units-of-Measure Field

Underlined Immediate-Action Field

One-of-Many Field

Numeric-Entry Field

Obtaining Measurement Results

Setting Up a Call

Triggering and Displaying Measurements

Preparing the Test Set for GPIB Control

General Programming Procedure

Basic Programming Examples

Control Annunciators

Addressing

Setting the Test Set Bus Address

Displaying the Bus Address

GPIB Command Guidelines

Command Names

Command Punctuation

Sample GPIB Program

Verifying that the Test Set is Operating Properly

CDMA Mode Quick Check

2 Configuring Your Test Set

General Operating Information

To Set Screen Intensity

To Set RF Voltage Interpretation (50 ohm/emf)

To Set the Date and Time

To Change the Beeper’s Volume

3 Operating Overview

To Change the Measurement Display

Using the On/Off Function

To Use the METER Format

To Set a Measurement Reference

To Use Measurement Averaging

Setting Measurement Limits

To Specify Units-of-Measure for CRT Display

To Specify Units-of-Measure for GPIB Data Transfer

To Enter and Change Values

To Enter Decimal Values

To Enter Hexadecimal Values

To Enter Values With Exponents

To Increment/Decrement Values

Saving and Recalling Instrument Setups

To Save an Instrument Setup

To Recall an Instrument Setup

To Clear All SAVE Registers

To Remove (Clear) an Individual SAVE Register

Choosing Register Names

Specifying POWERON Settings

Specifying BASE Settings

Memory Considerations

Using USER Keys

To Assign Local USER Keys

To Release Local USER Keys

To Assign Global USER Keys

To Release Global USER Keys

Setting an RF Generator/Analyzer Frequency Offset

To Turn Off RF Frequency Offset

To Change the RF Frequency Offset

Setting an RF Generator/Analyzer Level Offset

Interaction Between Screens

Printing A Screen

To Print A Screen’s Contents

Measurement Triggering Process

Active Measurements

Triggering A Measurement Cycle

Trigger Modes

Rho Suite of Measurements

Default Trigger Modes

Triggering Analog Measurements In Local Mode (Front Panel Operation)

Triggering CDMA Measurements In Local Mode (Front Panel Operation)