Anritsu ME7840A User Manual

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MODEL

ME7840A

POWER AMPLIFIER TEST SYSTEM

OPERATION AND

MAINTENANCE MANUAL

490 JARVIS DRIVE - MORGAN HILL, CA 95037-2809

P/N: 10410-00225

REVISION: A

PRINTED: JUNE 2000

WARRANTY

The ANRITSU product(s) listed on the title page is (are) warranted against defects in materials and workmanship for three years from the date of shipment.

ANRITSU’s obligation covers repairing or replacing products which prove to be defective during the warranty period. Buyers shall prepay transportation charges for equipment returned to ANRITSU for warranty repairs. Obligation is limited to the original purchaser. ANRITSU is not liable for consequential damages.

LIMITATION OF WARRANTY

The foregoing warranty does not apply to ANRITSU connectors that have failed due to normal wear. Also, the warranty does not apply to defects resulting from improper or inadequate maintenance by the Buyer, unauthorized modification or misuse, or operation outside of the environmental specifications of the product. No other warranty is expressed or implied, and the remedies provided herein are the Buyer’s sole and exclusive remedies.

TRADEMARK ACKNOWLEDGEMENTS

V Connector and K Connector are registered trademarks of ANRITSU Company. GPC-7 is a registered trademark of Amphenol Corporation. Ink Jet and Think Jet are registered trademarks of Hewlett-Packard Co. MS-DOS is a registered trademark of Microsoft Corporation.

NOTICE

ANRITSU Company has prepared this manual for use by ANRITSU Company personnel and customers as a guide for the proper installation, operation and maintenance of ANRITSU Company equipment and computer programs. The drawings, specifications, and information contained herein are the property of ANRITSU Company, and any unauthorized use or disclosure of these drawings, specifications, and information is prohibited; they shall not be reproduced, copied, or used in whole or in part as the basis for manufacture or sale of the equipment or software programs without the prior written consent of ANRITSU Company.

Safety Symbols

To prevent the risk of personal injury or loss related to equipment malfunction, ANRITSU Company uses the following symbols to indicate safety-related information. For your own safety, please read the informa tion carefully BEFORE operating the equipment.

Symbols used in manuals

DANGER

This indicates a very dangerous procedure that could result in serious injury or death if not performed properly.

WARNING This indicates a hazardous procedure that could result in serious in

jury or death if not performed properly.

CAUTION This indicates a hazardous procedure or danger that could result in

light-to-severe injury, or loss related to equipment malfunction, if proper precautions are not taken.

Safety Symbols Used on Equipment and in Manuals

(Some or all of the following five symbols may or may not be used on all ANRITSU equipment. In addition, there may be other labels attached to products that are not shown in the diagrams in this manual.)

The following safety symbols are used inside or on the equipment near operation locations to provide infor mation about safety items and operation precautions. Ensure that you clearly understand the meanings of the symbols and take the necessary precautions BEFORE operating the equipment.

This indicates a prohibited operation. The prohibited operation is indi cated symbolically in or near the barred circle.

This indicates a compulsory safety precaution. The required operation is indicated symbolically in or near the circle.

This indicates warning or caution. The contents are indicated symboli cally in or near the triangle.

This indicates a note. The contents are described in the box.

These indicate that the marked part should be recycled.

ME7840A OMM Safety 1

For Safety

WARNING

Always refer to the operation manual when working near locations at which the alert mark, shown on the left, is attached. If the operation, etc., is performed without heeding the advice in the operation manual, there is a risk of personal injury. In addition, the equipment perfor mance may be reduced. Moreover, this alert mark is sometimes used with other marks and de scriptions indicating other dangers.

WARNING

When supplying power to this equipment, connect the accessory 3-pin power cord to a 3-pin grounded power outlet. If a grounded 3-pin outlet is not available, use a conversion adapter and ground the green wire, or connect the frame ground on the rear panel of the equipment to ground. If power is supplied without grounding the equipment, there is a risk of receiving a severe or fatal electric shock.

Repair

WARNING

This equipment can not be repaired by the operator. DO NOT attempt to remove the equipment covers or to disassemble internal components. Only qualified service technicians with a knowledge of electrical fire and shock hazards should service this equipment. There are high-voltage parts in this equipment presenting a risk of severe injury or fatal electric shock to untrained personnel. In addition, there is a risk of damage to precision components.

WARNING

Use two or more people to lift and move this equipment, or use an equipment cart. There is a risk of back injury, if this equipment is lifted by one person.

Safety 1 ME7840A OMM

Chapter 1 General Information

SCOPE OF THIS MANUAL...............................1-1

INTRODUCTION ....................................1-1

RELATED MANUALS .................................1-1

CONVENTIONS.....................................1-2

SERIAL NUMBER ...................................1-2

ONLINE MANUALS ..................................1-2

PATS SYSTEM OVERVIEW ..............................1-2

HARDWARE DESCRIPTION..............................1-2

SYSTEM DESCRIPTION ................................1-5

DRA Scorpion ....................................1-5

MS4782X Test Set .................................1-6

Connectors and Ports ................................1-7

K FACTOR........................................1-9

ADAPTIVE P STOP ...................................1-9

SOFTWARE DESCRIPTION ..............................1-9

TEST EXECUTIVE ...................................1-9

SOFTWARE STRUCTURE ..............................1-11

MS7840A OPTIONS ..................................1-12

OPTIONAL ACCESSORIES..............................1-12

PREVENTIVE MAINTENANCE ...........................1-13

USER SUPPLED TEST SET .............................1-13

PERFORMANCE SPECIFICATIONS.........................1-13

RECOMMENDED ITEMS...............................1-15

USER SUPPLIED ITEMS ...............................1-15

Chapter 2 Installation

INTRODUCTION ....................................2-1

EQUIPMENT COMPLEMENT .............................2-1

UNPACKING and INSPECTION............................2-1

INSTALLATION - HARDWARE ............................2-2

INSTALLATION - SOFTWARE.............................2-7

ME7840A OMM i

Installation .....................................2-7

What else is on the CD?...............................2-7

Uninstalling the software..............................2-7

SERVICE CENTERS ..................................2-8

Chapter 3 Operations, General

INTRODUCTION ....................................3-1

PREPARING THE SYSTEM ..............................3-1

Unused Connections ................................3-2

USING PATS SOFTWARE ...............................3-4

Software

Organization.....................................3-4

COLLATERALFUNCTIONS ..............................3-5

File..........................................3-5

Help .........................................3-6

Tools .........................................3-7

Chapter 4 Operations, Calibration

INTRODUCTION ....................................4-1

OPERATION, GENERAL ................................4-1

PROGRAM FILES....................................4-1

TEST EQUIPMENT...................................4-2

GENERAL ........................................4-3

POWER LEVEL .....................................4-4

HOTS22.........................................4-8

S-PARAMETERS CAL .................................4-11

CAL FILE SETUP ...................................4-15

Chapter 5 Operations, Measurement

INTRODUCTION ....................................5-1

OPERATION, GENERAL ................................5-1

MEASUREMENT CALIBRATION ...........................5-1

GENERAL ........................................5-1

Calibration(s) Completed ..............................5-1

Calibration(s) Not Completed ...........................5-2

S-PARAMETER TESTS: S

S-PARAMETER TEST: K FACTOR...........................5-7

POWER SWEEP, TWO TONE.............................5-10

Single Frequency Power Sweep ..........................5-10

Multiple Frequency Power Sweep.........................5-14

21,S11,S22,S12

,ALL.....................5-4

ii ME 7840A OMM

Gain and IMD Power Sweep ...........................5-18

POWER SWEEP, ONE TONE .............................5-22

Single Frequency Power Sweep ..........................5-22

IMD...........................................5-26

HARMONICS .....................................5-29

HOTS22........................................5-32

Chapter 6 Performance Verification Procedure

INTRODUCTION ....................................6-1

CONVENTIONS.....................................6-1

TEST

EQUIPMENT ......................................6-1

SOURCE OUTPUT ACCURACY ............................6-2

Setup: ........................................6-2

Test Procedure ...................................6-2

RETURN LOSS CONFIDENCE TEST.........................6-3

Setup.........................................6-3

Test Procedure: ...................................6-4

SYSTEM DYNAMIC RANGE .............................6-6

Test Procedure: ...................................6-6

RECEIVER DISPLAY LINEARITY ..........................6-8

Setup: ........................................6-8

Chapter 7 Preamplifier Operations

INTRODUCTION ....................................7-1

USE OF EXTERNAL PREAMPLIFIERS........................7-1

Alternative 1 ....................................7-1

Alternative 2 ....................................7-1

Appendix A Calibration Specification Files

INTRODUCTION ....................................A-1

FILE TYPES.......................................A-1

OPEN FILES ......................................A-1

TECHNICAL DETAILS.................................A-1

POWER LEVE.TXT ..................................A-11

CAL FILES SETUP.TXT................................A-11

HOT S

.TXT ......................................A-13

S-PARAMETERS. TXT ................................A-14

ME7840A OMM iii/iv

Figure 1-1. Model ME7840A Power Amplifier Test System (PATS)

Chapter 1 General Information

1-1 SCOPE OF THIS

MANUAL

This manual provides operating and maintenance information for the ME7840A Power Amplifier Test System (PATS, Figure 1-1). The follow ing topics are discussed:

Equipment Description

Equipment Installation and Connection

Software Description

Software Installation

Calibration

System Operation

Test Procedures and Test Results Interpretation

System Performance Verification

The procedures described in this manual presume a working knowledge of vector network analyzers and RF power amplifier testing procedures. Refer to the other manuals supplied with the ME7840A (see below) for more detailed explanations of the system equipment and procedures.

1-2 INTRODUCTION This chapter provides information to familiarize the user with the basic

ME7840A Power Amplifier Test System. Included is information about re lated manuals, and the available models and options.

1-3 RELATED

MANUALS

The ME7840A manual set consists of the following manuals: The operat ing and programming manuals are supplied with the equipment; the maintenance manuals are optional items that may be purchased.

Manual Description ANRITSU Part Number

ME7840A Operating & Maintenance Manual (OMM)

MS462XX Operating Manual (OM) 10410-00203 MS462XX Programming Manual (PM) 10410-00204 MS462XX Maintenance Manual (MM) 10410-00205 (Optional) MS4782X Test Set Maintenance Manual (MM) 10410-00218 (Optional))

10410-00225

ME7840A OMM 1-1

CONVENTIONS GENERAL INFORMATION

1-4 CONVENTIONS Throughout this manual, the ME7840A Power Amplifier System may be

referenced as PATS or ME7840A; the MS462XC may be referenced as Scorpion or MS462XC; and the MS4782X Test Set may be referenced as Test Set or MS4782X.

1-5 SERIAL NUMBER All ANRITSU instruments are assigned a unique six-digit serial number,

such as “940101.” This number is affixed to a decal on the rear panel of each unit. In any correspondence with ANRITSU Customer Service, please use this number.

1-6 ONLINE MANUALS This manual is available on CD ROM as an Adobe Acrobat™ (*.pdf) file.

The file can be viewed using Acrobat Reader™, a free program that is also available on the CD ROM. This file is “linked” such that the viewer can choose a topic to view from the displayed “bookmark” list and “jump” to the manual page on which the topic resides. The text can also be word-searched. CD ROM part numbers are available on ANRITSU’s Internet home page (http://www.global.anritsu.com/ library/). You can also contact ANRITSU Customer Service for price and availability.

1-7 PATS SYSTEM

OVERVIEW

1-8 HARDWARE

DESCRIPTION

The ANRITSU ME7870A Power Amplifier Test System (PATS) is intended for the measurement and real-time graphical display of the following parameters of a power amplifier in the frequency range of 10 MHz to 6 GHz:

S-Parameters including Hot S

K Factor

Gain Compression and Phase Distortion

Intermodulation Distortion

Harmonics

Drain Current and Power Added Efficiency (PAE)

PATS is designed to facilitate alignment, tuning and pass/fail testing of the components, modules and subassemblies of a power amplifier as well as the completed amplifier.

The ME7840A hardware (Figure 1-1) consists of a MS462XC, Direct Re ceiver Access (DRA) Scorpion, a MS4782X Test Set, a customer supplied Personal Computer (PC), and an optional current probe (refer to Chapter 2, Figure 2-4 ). The MS462XC is available in two frequency ranges: 10 MHz to 3 GHz or 10 MHz to 6 GHz.

The Test Set is available in two configurations, as described in Table 1-1 The MS4782D is standard, and the MS4782A is Option 2. A block dia gram of the PATS is shown in Figure 1-2 and the Option 2 system in Fig ure 1-3.

1-2 ME 7840A OMM

GENERAL INFORMATION HARDWARE DESCRIPTION

SOURCE 2 SOURCE 1

MS4782D Test Set

ACCESS

SCORPION

DIRECT RECEIVER

OPTIONAL EXTERNAL

PREAMPLIFIERS

ATTENUATORS 70dB, 10dB/step

RF3

COMBINER

-30dB

STEP

RF1

REVERSE

FORWAR

TRANSFER SWITCH

GPIB

ANALOG IN

SYSTEM

CONTROLLER

(PC)

GPIB

RECEIVERS

EXT I/O

KKKN

LIMITER

STEP

ATTENUATOR

70dB, 10dB/step

KKN

RF2

-30dB

CONTROL LINES

EXTERNAL

100 W

TERMINATION

CIRCULATOR

OPTIONAL

SPECTRUM

ANALYZER

OPTIONAL

MODULATION

SYNTHESIZER

OPTIONAL

EXTERNAL

PRE-AMP

-30dB

AUT

POWER

METER

POWER SUPPLY

CURRENT PROBE

Indicates coaxjumper in the as-shipped configuration

Figure 1-2. Overall Functional Block Diagram of the Basic Power Amplifier Test System (PATS) with MS4782D Test Set

ME7840A OMM 1-3

HARDWARE DESCRIPTION GENERAL INFORMATION

SOURCE 2 SOURCE 1

ACCESS

SCORPION

DIRECT RECEIVER

OPTIONAL EXTERNAL

PREAMPLIFIERS

ATTENUATORS 70dB, 10dB/step

RF3

COMBINER

STEP

RF1

REVERSE

FORWAR

TRANSFER SWITCH

GPIB

ANALOG IN

SYSTEM

CONTROLLER

(PC)

GPIB

RECEIVERS

EXT I/O

KKKN

KKN

RF2

CONTROL LINES

-30dB

LIMITER

POW

OPTIONAL

SPECTRUM

ANALYZER

POWER

METER

POWER SUPPLY

MS478A Test Set

OPTIONAL

MODULATION

SYNTHESIZER

OPTIONAL

EXTERNAL

PRE-AMP

HIGH

STEP

ATTENUATOR

-30dB

70dB, 10dB/step

-30dB

TERMINATION

AUT

CURRENT PROBE

Indicates coaxjumper in the as-shipped configuration

Figure 1-3. Overall Functional Block Diagram of the Option 2 Power Amplifier Test System (PATS) with MS4782A Test Set

1-4 ME 7840A OMM

GENERAL INFORMATION SYSTEM DESCRIPTION

Table 1-1. Test Set Configurations

Model

MS4782A 800 to 1000 50 Yes Internal MS4782D 800 to 2400

Notes:

1. This frequency range does not account for any restricting effects caused by use of external circulator.

2. This Max AUT power assumes a minimum isolation of 23 dB provided by external circulator(s). Two circulators may have to be used to provide the required isolation.

Frequency Range

(MHz)

(Note 1)

1-9 SYSTEM

DESCRIPTION

Max AUT Power Output

(Watts)

100 (Note 2)

Reverse Measurements

, Hot S22,S12Possible)

Yes External

(at AUT Output Path)

Circulator

Brief descriptions of the DRA Scorpion (MS462XC) and MS4782X Test Set are given below.

DRA Scorpion The Scorpion Direct Receiver Access (DRA) version Vector Network Mea-

surement System (VNMS) (Figure 1-2) functions under control of the software residing in the PC through GPIB commands. The software supports tuning and alignment operations by generating real time graphic displays of the measured data on the PC screen.

Under software control, 3

rd,5th

and 7thorder IMD products can be measured and displayed. Also, the Upper and Lower Side Band (USB & LSB) components of the IMD products are measured and displayed separately.

The DRA Scorpion includes the following capabilities:

Two internal, independent RF sources. Each source has a range of –15 dBm to +10 dBm. A 0dB to 70dB step attenuator (10 dB / step) is provided for each source resulting in a Power Output range of –85 dBm to +10 dBm from each source.

NOTE

After test set losses, the maximum net power at the input of the amplifier under test (AUT) is +5 dBm.

Complete built-in capability for IMD measurements. A combiner is provided in the Test Set.

Internal Transfer Switch enabling S22and Hot S22measurements. The reflectometer set-up is provided in the Test Set.

Direct access to each of the four receiver channels (two reference channels and two test channels) for maximum flexibility in measur ing forward and reverse S-parameters over a wide range of AUT output power.The Test Set provides incident and reflected signal separation.

ME7840A OMM 1-5

SYSTEM DESCRIPTION GENERAL INFORMATION

MS4782X Test Set The Series MS4782X Test Set contains a Wilkinson type combiner that

combines the two RF signals from Ports 1 and 3 (RF1 & RF3) of the Scor pion. External preamplifiers can optionally be provided at the combiner input to boost the input RF power to the amplifier-under- test (AUT). The combiner has power input rating of 30-Watts maximum when terminated with a VSWR of 1.2:1. For an open or short at the combiner output, the combiner input power rating is 0.5 Watts maximum.

The output of the combiner is fed to a source selection switch that enables one of the following to be applied to the AUT:

The combined signal from the Scorpion sources.

A modulated signal from an optional external modulation synthe

sizer.

A provision for the insertion of an optional external pre-amplifier (after the combiner and source selection switch) is also provided. Refer to Chap ter 7, “Preamplifier Operations,” for details.

The test set includes a bi-directional coupler at the input of the AUT that separates the incident signal from the reflected signal. The power rating of this bi-directional coupler is 100 watts average. The –30 dB portion of the incident and reflected signals are applied to the Scorpion reference port a1 and test port b

, respectively, for S11measurement. The S11mea-

surement determined by the DRA Scorpion is simply the ratio of the reflected signal to the incident signal.

The amplified output of the AUT is fed to a high power coupler in the test set. The power rating of this coupler is also 100-watts average. The –30 dB coupled arm of this coupler is routed to the test port b

of the Scorpion

througha6dBresistive divider and a 0-dB to 70-dB step attenuator (10dB/step). A limiter is also provided in this path provide added protec

tion for the Scorpion reference channel . The divider enables the connections of a power meter or Spectrum Ana

lyzer, when desired, to measure the AUT b

output.

The through arm of the 100-W coupler is routed to a high power (100-Watt) termination through a circulator. In the MS4782A Test Set, the circulator is internal and has a rating of 100 watts average. This circulator has an isolation specification of 20-dB minimum. This means that the AUT output power is attenuated by 20 dB (plus other losses) be fore reaching the Scorpion port 2. Since the maximum (no-damage) power level for this port is 27 dBm (0.5 watt), this establishes the maximum AUT output power at 50 watts.

In the MS4782D Test Set, the circulator is external as shown in Figure 1-2. In selecting an external circulator, the following criteria should be used.

Power rating: Should be no less than the power output of the ampli fier-under-test (AUT). It should be noted that a 100 watt termina

tion is provided in the Test Set for the termination port of the exter nal circulator.

1-6 ME 7840A OMM

GENERAL INFORMATION SYSTEM DESCRIPTION

Bandwidth: Should be sufficiently wide to cover the frequency band

of the AUT. Isolation: Should be no less than (Po-27 dB), where Pois the

power output in dBm of the AUT. Thus for Po = 47 dBm (50 watts), a 20 dB isolation is required. For a P dBm (100 watts), two circulators in series can be used.

Where S

or Hot S22measurements are not required, power amplifiers

with up to 100 watts average output power can be tested with the MS4782D Test Set without any circulator by connecting the through arm of the output coupler directly to the 100 watt termination (Port C1 con nected to Port C2 on the rear. The unit is shipped from the factory with this loop jumper.)

greater than 47 dBm up to 50

Connectors and Ports

CAUTION

Connecting the external circulator incorrectly or placing a direct connection between C1 and C3 on MS4782D rear panel will cause permanent damage to MS462XC.

For S

measurements, the transfer switch located within the Scorpion

routes the source 1 output signal to the output port of the AUT via Port 2 (RF2) of the Scorpion. A separate 100-watt coupler in the test set applies the –30 dB portion of this incident signal to the Scorpion reference port a

. The –30 dB portion of the signal reflected from the AUT output port is

applied to the Scorpion test port b

by means of the AUT output coupler.

The PATS calibration is performed with the test set in place, at the connectors where AUT will be connected directly. Therefore, the test set components and cables are included in the calibration loop and their effects are calibrated out, resulting in correct and accurate measurements of the AUT.

The software supplied by ANRITSU supports operator control of the source selection switch and step attenuator in the test set. This control is achieved through the parallel TTL control lines available at the Scorpion rear panel “External I/O” connector. The GPIB commands from the PC to the Scorpion set the TTL control lines to the desired states.

On the front panel of the Model MS4622/3C DRA Scorpion three Type N (female) connectors are provided for Ports 1, 2 and 3.

Port 1 provides RF source 1 when the transfer switch is in the forward position, and is terminated in 50 ohms to ground when the transfer switch is in the reverse position.

Port 2 provides RF source 1 when the transfer switch is in the reverse po sition, and is terminated in 50 ohms to ground when the transfer switch is in the forward position.

Port 3 is allocated to RF source 2. Under independent control, port 3 pro vides RF source 2, or is terminated in 50 ohms to ground.

On the rear of the unit, four SMA connectors (Figure 1-4) are provided for Reference ports a

and a2and Test Ports b1and b2. The front of the unit

as well as all other mechanical specifications is the same as the model MS4623B.

On the MS4782D Test Set, three additional SMA connectors provide for connecting an external circulator. If reverse measurements (S

and Hot

ME7840A OMM 1-7

SYSTEM DESCRIPTION GENERAL INFORMATION

WARNING

NOOPERATOR SERVICE-

ABLEPARTS INSIDE.

REFERSERVICING TO QUALIFIEDPERSONNEL.

IEEE 488.2

GPIB

Dedicated

GPIB

Serial Port

Ethernet

N274

Noise

+28V

Noise

Figure 1-4. MS462XC Rear Panel Showing Ports a1,a2,b1, and b

VGA

LPT LinePrinter

Ext

Analog

Trigger

Output

CAUTION

FORCONTINUED FIRE

PROTECTIONREPLACE

ONLYWITH SPECIFIED

TYPEAND RATED FUSE.

b1b

CAUTION

DONOT OPERATE

WITHPOWER CORD

UNGROUNDED

SCSI-2

REPLACE FUSEONLY WITH

ExtAnalogInExt

Ext I/O

47-440 Hz 85-264VAC

SAME TYPEAND RATING

Ext 10MHz

Source

Control

N274

WARNING

NO OPERATORSERVICE-

ABLE PARTSINSIDE.

REFER SERVICING TO QUALIFIED PERSONNEL.

Output

Ext Preamp

CAUTION

DO NOT OPERATE

WITH POWER CORD

UNGROUNDED

Input

50 dBm

Max

b2To

AUT

TestPort 2

External

Circulator

a2To

C2C1

27 dBm

VNMS Port 2

50 dBm

Max

100W

Termination

(Internal)

Max

LINE INPUT

85-240 VAC

47-63 Hz

100 VAmax

FUSE 250 V 1.6A T

CAUTION

FOR CONTINUED FIRE PROTECTION REPLACE ONLYWITH SPECIFIED TYPEAND RATED FUSE

Figure 1-5. MS4782A Rear Panel Showing Circulator Connections C1, C2, and C3

1-8 ME 7840A OMM

GENERAL INFORMATION K FACTOR

S22) are not desired, then a circulator is not required. Instead, a through line should be connected between connectors C1 and C2 (Figure 1-5). The MS4782A is shipped from the factory with this through line in place.

1-10 K FACTOR K factor is a parameter which is sometimes used to indicate the stability

of an amplifier. K factor is a function of all four S parameters and is de fined by the formula

--+1

Where D =S The necessary and sufficient condition for unconditional stability is that

K>1 and K factor is available as the sixth choice in the S parameters menu (first

five choices are: S setup as S-parameter measurements including a full 12-term calibration applies to this measurement. The result is “dynamic” meaning that the above formula is applied at each point for each sweep as the S parameters are reported to the PC over the GPIB.

11S22-S12S21

D<1

11 21

11,S22,S21,S12

and ALL). The same conditions and

1-11 ADAPTIVE P STOP Adaptive P stop lets users enter a gain compression value at which the

value during a power sweep. For exam-

1-12 SOFTWARE

DESCRIPTION

program will adjust the final P ple, if user sets 3 dB P-stop, the program commands the execution of one sweep, find P crement, and reset this as the upper bound of the power sweep.

The ME7840A software exhibits an open architecture that has been de veloped using standard C++ and Visual Basic languages. The software is compiled as an Active X exe module.

The software resides in the System Controller (PC), and communicates with the Direct Receiver Access (DRA) Scorpionâ Vector Network Mea surement System (VNMS) via the GPIB bus. Optionally, the ME7840A software can also interface with additional GPIB capable test equipment, such as a multimeter or a power meter.

value where 3 dB gain compression occurs, back up 1 in

1-13 TEST EXECUTIVE The Test Executive is an optional layer of test management software. The

ANRITSU measurement and display software does not require a separate Test Executive, even though it can operate in conjunction with one such as the National Instruments TestStand or customer’s proprietary Test Executive. In the absence of a separate test executive, the ANRITSU soft ware can be operated on a stand-alone basis or can be called directly by a Microsoft Windows 95/98/2000 or NT program such as Word, Excel or Ac cess that supports Visual Basic function calls.

ME7840A OMM 1-9

TEST EXECUTIVE GENERAL INFORMATION

The functions of the Test Executive, if supplied by ANRITSU or by the customer, would include:

Test Sequence development and management

Part number and serial number management

Interface with the Database

1-10 ME 7840A OMM

GENERAL INFORMATION SOFTWARE STRUCTURE

1-14 SOFTWARE

STRUCTURE

The software structure is illustrated in Figure 1-6 (below).

Test Executive:

Automated Testing,

Test Plan Development

( optional item )

GUI/EXE

Measurement, Calibration & Tuning

Anritsu

Modules

VNA PowerTools

V4.00

DLL/GUI

DLL

MS Access

Local/Network Database

Scorpion VNMS

Figure 1-6. PATS Software Structure

GPIB

RF Power

Meter

(Optional)

MultiMeter

(Optional)

Te st St at i on

Test Instruments

ME7840A OMM 1-11

MS7840A OPTIONS GENERAL INFORMATION

1-15 MS7840A OPTIONS The following options are available:

Table 1-2. MS7840A Options

Model Option Number Description

ME7840/1 1 Replaces MS4623C with MS4622C (3 Ghz option) ME7840/2 2 Replaces MS4782D Test Set with MS4782ATest Set ME7840/3 3 Delete Test Set (Note: The ND43425 Accessory and Inter

1-16 OPTIONAL

ACCESSORIES

connect Kit will also be deleted with this option.)

The accessories described below are available from ANRITSU.

Model ML2430A Power Meter

Model MG3672A Digital Modulation Signal Generator/with

MG0314A W-CDMA Modulation Unit Model MS2602A Spectrum Analyzer

Model MS8607A Digital Mobile Radio Transmitter Tester

AC/DC Current Probe (for AUT drain current and power-added-efficiency (PAE) measurements) (See below).

Max Current

100 mV/A: 10A

10 mV/A: 100A

1 mV/mA: 1A

10 mV/A: 80A

Accuracy (at lesser cur-

rent range setting)

3% of reading ±50 mA 2000-1067

2% of reading ±5 mA 2000-1085

ANRITSU Part Number

Circulators to be used externally with the MS4782D Test Set (see below).

Frequency Band Isolation Max AUT Power

800 to 1000 MHz 20 dB min 50 watts 1000-50

1.8 to 2.5 GHz 20 dB min 50 watts 1000-52

1.8 to 2.5 GHz 22 dB min 79 watts 1000-53 Note: All circulators have 3 SMA female connectors.

15SS50-0.35B Cable Assembly. Three of these cables can be used to

ANRITSU Part

Number

connect any one of the external circulators offered above to the

1-12 ME 7840A OMM

GENERAL INFORMATION PREVENTIVE MAINTENANCE

MS4782D Test Set. The same cable is also used to connect the Test Set to the MS462XC receivers on the rear panel.

1-17 PREVENTIVE

MAINTENANCE

1-18 USER SUPPLED

TEST SET

1-19 PERFORMANCE

SPECIFICATIONS

The ME7840A Power Amplifier Test System does not require any preven tive maintenance.

The ANRITSU MS4782X is the recommended test set for PATS; however, users supply their own test set. To ensure that such a test set will func tion properly with the PATS, a set of specifications and caveats is pro vided in Appendix B.

Specifications for the M7840A Power Amplifier Test System are provided in Table 1-3.

ME7840A OMM 1-13

PERFORMANCE SPECIFICATIONS GENERAL INFORMATION

Table 1-3. Performance Specifications for ME7840A Power Amplifier Test System

Characteristic Value Notes

100 W maximum With MS4782D Test Set and with23 dB

Amplifier Under Test Power Output

50 W maximum With MS4782A TestSet

isolation between AUT power output and MS4623C, Port 2

Bandwidth through Test Set

Amplifier Under Test Input Power range available from PATS

IMD 3rd Order Dynamic Range 70 dB min With 10 Hz IF Bandwidth @300 kHz tone

Port Power Accuracy

Drift over 60 hours 0.15 dB maximum, peak to peak Dynamic Range 80 dB minimum Overall system, including test set

Port Match (test ports 1 and 2)

Directivity 40 dB minimum Corrected value

Environmental

800 MHz to 2.4 GHz With MS4782D Test Set (Note 1) 800 MHz to 1.0 GHz With MS4782A TestSet

-85 to +5 dBm At AUT input

separation and -20 dBm tone levels ±0.1 dB maximum With flat power calibration ±1 dB maximum Without flat power calibration

40 dB minimum Corrected value 13 dB minimum Uncorrected value

Storage Temperature Range 40° Cto+75° C Operating Temperature Range 0° Cto+50° C Range Over Which Specifications Apply 23 ±3° C Relative Humidity 5% to 95% at +40° C Height 152.5 mm (6 in.)

Physical, MS4782X Test Set

Note 1: This frequency range does not take into account any restricting effects of the external circulator (if one is used for reverse

measurements)

Width 444 mm (17.4 in.) Depth 500 mm (19.7) Weight 10 kg (22 pounds) or less

1-14 ME 7840A OMM

GENERAL INFORMATION RECOMMENDED ITEMS

1-20 RECOMMENDED

ITEMS

Table 1-4. Recommended Test Equipment

Item Critical Specification/Notes Manufacturer/Model

Power Meter GPIB capable ANRITSU Model ML243XA

Power Sensor 10 MHz to 6 GHz ANRITSU Model MA247XA N connector Calibration Kit Type N Open, Short, Broadband Load ANRITSUModel 3653 or 3753LF Offset Termination 6 dB ANRITSU Model SC5237 Offset Termination 20 dB ANRITSU Model SC5270 Power Divider ANRITSU Model 11N50B Cable 50 Ohm, N-male to N-male ANRITSU Model 3670NN50-2 Adapter 50 Ohm, N-male to N-male ANRITSU Model 34NN50Ar GPIB Cable None ANRITSU 2100-2 SMA/3.5 mm Connector Calibration Kit Required if amplifier-under-test (AUT)

Table 1-2 provides a list of test equipment and other items needed for cal ibration and performance verification.

ANRITSU 3750LF

has SMA/3.5 mm connectors

1-21 USER SUPPLIED

ITEMS

Item Critical Specification

Personal Computer (PC) Pentium II or better, 200 MHz or faster, with WindowsÒ 95/98/2000 or NT operating

GPIB Cable None

The following items required for the operation of the ME7840A Power Amplifier Test System must be supplied by the user.

system and National Instruments GPIB card installed.

ME7840A OMM 1-15/1-16

Chapter 2 Installation

2-1 INTRODUCTION This chapter describes the installation, connection and set-up of the

equipment that comprises the ME7840A Power Amplifier Test Station.

2-2 EQUIPMENT

COMPLEMENT

2-3 UNPACKING and

INSPECTION

The ME7840A is made up of the following pieces of equipment:

Scorpionâ Vector Network Measurement System (VNMS), Direct

Receiver Access (DRA) version: Model MS4622C (10 MHz to 3 GHz) or Model MS4623C (10 MHz to 6 GHz)

Model MS4782X Power Amplifier Test Set

System measurement software

Current probe(s) (optional item)

One or more external circulators (optional item, for use with

MS4782D Test Set

Accessory Kit: Includes interconnect cables and 50W terminations for Aux ports

The ME7840A equipment has been securely packaged. The packaging material and container should be retained in case the equipment must be re-shipped or placed into storage.

The MS4622C or MS4623C DRA Scorpionâ VNMS and the MS4782X Test Set are each packed within heavy cardboard boxes.

Step 1. Carefully cut the sealing tape on the top box surface with a

packing knife.

Step 2. Open the box lids, and remove the upper layer of foam mate

rial.

Step 3. Lift the equipment from the boxes. Two persons should do

this, as the equipment is heavy and bulky.

ME7840A OMM 2-1

INSTALLATION - HARDWARE INSTALLATION

A listing of the non-optional-accessories always supplied with PATS is listed below. The cables and terminators are shown in Figures 2-3 and 2-2, on page 2-3.

Item Part No. Quantity

Broadband Termination 28N50LF 2 Control Cable 803-49 1 RF Cables, Type N connectors (front) 15NN50-0.25B 3 RF Cables, SMA connectors (rear) 15NN50-0.35B 4

2-4 INSTALLATION -

HARDWARE

System hardware is set-up is a straight-forward process. Follow the steps below in sequence to ensure a trouble free installation.

Step 1. Place the MS462XC on top of the MS4782X Test Set. Figure

2-1 shows how the green colored feet on the case of each unit stack on each other.

Foot

Figure 2-1. ME7840A Component Assembly

Step 2. Install the three front RF interconnect cables. Figure 2-3 (fol

lowing page) shows the installation of the RF interconnect ca bles between the front panel of the MS462XC and the front panel of the Test Set. Table 2-1 lists the applicable connectors by designation or function.

2-2 ME 7840A OMM

INSTALLATION INSTALLATION - HARDWARE

PORT 3

AUX OUT

EXTERNAL

SOURCE

INSTALL 50 OHM TERMINATIONS

ON UNUSED PORTS

INSTALL 50 OHM TERMINATIONS

ON UNUSED PORTS

PORT 1

PORT 2

PORT 1PORT 2PORT 3

TEST PORT 2

TEST PORT 1

AUT

Figure 2-3. ME7840A Front RF Cable Connections (through-line shown between test port 1 and test port 2)

GPIB CONNECTOR

GPIB CABLE

EXTERNAL I/O CONNECTOR

DEDICATED

GPIB CONNECTOR

(Used during

power level calibration)

AC POWER CORD

CONTROL CABLE

RF CABLES (4ea)

CONTROL IN CONNECTOR

AC POWER CORD

EXT PREAMP

OUTPUT

INPUT

CONTROL CABLE

CIRCULATOR

Figure 2-2. ME7840A Rear Cable Connections

ME7840A OMM 2-3

INSTALLATION - HARDWARE INSTALLATION

Step 3. Install the four RF cables between the rear of the MS462XC

and the Test Set. Torque the cables to 8 inch-pounds (SMA Connectors) or 12 inch-pounds (Type N connectors). Table 2-1 lists the applicable connectors by designation or function.

Table 2-1. RF Cable Connection

VNMS - FRONT

PORT 1 “TO PORT 1” PORT 2 “TO PORT 2” PORT 3 “TO PORT 3”

TEST SET - FRONT

TEST PORT 1 DUT INPUT TEST PORT 2 DUT OUTPUT

VNMS - REAR

PORT a1 PORT a1 PORT a2 PORT a2 PORT b1 PORT b1 PORT b2 PORT b2

MS4782D TEST SET - REAR

C1 Circulator 1 or C2 C2 Circulator 2 or C1

(See Figure 1-2 for a block diagram)

Connects To:

Connects To

TEST SET - FRONT

DEVICE UNDER TEST

MS4782X -REAR

CIRCULATOR

C3 Circulator 3 or Open

Step 4. Install the control cable between the External I/O connector

on the rear panel of the MS462XC and the Control In connec tor on the rear panel of the Test Set.

Step 5. Connect the GPIB cable from IEEE-488.2 connector on the

rear panel of the MS462XC to the PC/System Controller. (Note: This cable is not supplied with the ME7840A PATS.)

Step 6. Connect an AC power cord to each of the three-prong connec

tors on the rear panel of the Test Set and the MS462XC.

Step 7. (Optional, for drain current PAE measurements) Connect the

current probe cable BNC connector to the Ext. Analog In con nector on the rear of the MS462XC as shown in Figure 2-4 (page 2-5).

2-4 ME 7840A OMM

INSTALLATION INSTALLATION - HARDWARE

Figure 2-4. Current Probe Connection

EXTERNAL ANALOG

IN CONNECTOR

CURRENT SENSOR

CABLE PASSAGE

CURRENT PROBE

HEAD

ME7840A OMM 2-5

INSTALLATION - HARDWARE INSTALLATION

Figure 2-5. Software Installation Window

2-6 ME 7840A OMM

INSTALLATION INSTALLATION - SOFTWARE

2-5 INSTALLATION -

SOFTWARE

Installation Run the appropriate Setup.exe files to install Power Tools then the

What else is on the CD?

ME7840A software is delivered on a CD. The ANRITSU Power Tools li brary Version 4.0 or higher, which is required to be installed on the target system (the PC which is receiving the installation of ME7840A software). Power Tools Version 4.0 is also included in the ME7840A Software CD.

ME7840A software (Figure 2-5). During installation, the system may in dicate that some files being installed already exist. In general it is best to accept copying newer versions of files and reject copying older versions. If in doubt, cancel the installation, backup the files in question, and try again. The Readme.txt file lists the files and versions copied to the target system during installation of ME7840A Software.

The system may also copy some files during ME7840A installation andthen ask you to reboot. If this happens, reboot your Windows PC and run the ME7840A Setup.exe program again after rebooting.

The CD includes a Readme.txt file in the root directory and two folders. The readme file contains specific instructions for installing the software and a listing of the features in the version being installed. The folders are as follows:

q Power Tools Version 4.0 Installation files

PATS Installation Files

Uninstalling the software

To uninstall ME7840A software or Power Tools go to the Windows Control Panel and click on “Add/Remove Programs.” Select the programs you would like to remove and follow instructions.

ME7840A OMM 2-7

SERVICE CENTERS INSTALLATION

2-6 SERVICE CENTERS ANRITSU Service Centers are listed in Table 2-2.

Table 2-2. ANRITSU Service Centers

UNITED STATES

ANRITSU COMPANY 685 Jarvis Drive Morgan Hill, CA 95037-2809 Telephone: (408) 776-8300 1-800-ANRITSU FAX: 408-776-1744

ANRITSU COMPANY 10 New Maple Ave., Unit 305 Pine Brook, NJ 07058 Telephone: (201) 227-8999, 1-800-ANRITSU FAX: 201-575-0092

ANRITSU COMPANY 1155E. Collins Blvd Richardson, TX 75081 Telephone: 1-800-ANRITSU FAX: 972-671-1877

AUSTRALIA

ANRITSU PTY. LTD. Unit 3, 170 Foster Road Mt Waverley, VIC 3149 Australia Telephone: 03-9558-8177 FAX: 03-9558-8255

BRAZIL

ANRITSU ELECTRONICA LTDA. Praia de Botafogo, 440, Sala 2401 CEP22250-040, Rio de Janeiro, RJ, Brasil Telephone: 021-527-6922 FAX: 021-53-71-456

CANADA

ANRITSU INSTRUMENTS LTD. 215 Stafford Road, Unit 102 Nepean, Ontario K2H 9C1 Telephone: (613) 828-4090 FAX: (613) 828-5400

CHINA

ANRITSU BEIJING SERVICE CENTER Beijing Fortune Building 1515, 5 Dong San Huan Bei Lu Chaoyang qu, Beijing 100004, China Telephone: 011861065909231 FAX: 011861065909235

FRANCE

ANRITSU S.A 9 Avenue du Quebec Zone de Courtaboeuf 91951 Les Ulis Cedex Telephone: 016-09-21-550 FAX: 016-44-61-065

GERMANY

ANRITSU GmbH Grafenberger Allee 54-56 D-40237 Dusseldorf, Germany Telephone: 0211-968550 FAX: 0211-9685555

INDIA

MEERA AGENCIES (P) LTD. A-23 Hauz Khas New Delhi 110016 Telephone: 011-685-3959 FAX: 011-685-2275

ISRAEL

TECH-CENT, LTD. 4 Raul ValenbergSt Tel-Aviv 69719 Telephone: (03) 64-78-563 FAX: (03) 64-78-334

ITALY

ANRITSU Sp.A Roma Office Via E. Vittorini, 129 00144 Roma EUR Telephone: (06) 50-99-711 FAX: (06) 50-22-4252

KOREA

ANRITSU CORPORATIONLTD. 14F, Hyunjuk Bldg 832-41 Yeoksam-Dong Kangnam-Ku Seoul South Korea 150 010 Telephone: 02-553-6603 FAX: 02-553-6604, 02-553-6605

JAPAN

ANRITSU CUSTOMER SERVICE LTD. 1800 Onna Atsugi-shi Kanagawa-Prf. 243 Japan Telephone: 0462-96-6688 FAX: 0462-25-8379

SINGAPORE

ANRITSU (SINGAPORE) PTE LTD. 6 New Industrial Road #06-01/02 Hoe Huat Industrial Bldg Singapore 536199 Telephone: 282-2400 FAX: 282-2533

SOUTH AFRICA

ETECSA 12 Surrey Square Office Park 330 Surrey Avenue Ferndale, Randburt, 2194 South Africa Telephone: 011-27-11-787-7200 FAX: 011-27-11-787-0446

SWEDEN

ANRITSU AB Botivid Center Fittja Backe 1-3 S145 84 Stockholmn Telephone: (08) 534-707-00 FAX: (08) 534-707-30

TAIWAN

ANRITSU CO., LTD. 6F, No. 96, Section 3 Chien Kuo N. Road Taipei, Taiwan, R.O.C. Telephone: (02) 515-6050 FAX: (02) 509-5519

UNITED KINGDOM

ANRITSU LTD. 200 Capability Green Luton, Bedfordshire LU1 3LU, England Telephone: 015-82-4332003 FAX: 015-82-731303

2-8 ME 7840A OMM

Chapter 3 Operations, General

3-1 INTRODUCTION The basic operation of the Model ME7840A Power Amplifier Test Station

(without external preamplifiers) is described in this and the following two chapters: Calibration Operations and Measurement Operations. “Calibra tion Operations” describes the software measurement calibration func tion and “Measurement Operations” describes the software measurement function. This chapter describes the setup and general operation of the software. (See Chapter 7 for operation with external preamplifiers.)

3-2 PREPARING THE

SYSTEM

CAUTION

The AUT RF power output maximum level should be no more than the level shown in the tabulation at right. Otherwise, damage to equipment will occur.

Refer to Figure 3-1 to identify the equipment named in the recommended power-up sequence for the ME7840A.

Step 1. Connect the output of the AUT to Test Port 2 of the MS4782X. Step 2. Connect the input of the AUT to Test Port 1 of the MS4782X. Step 3. Ensure that the power rating of the cables is suitable for the

test, and that the connections are tightened.

Step 4. Turn on the MS462XC then the MS4782X Test Set. Step 5. Set the output of the MS462XC so that the AUT output power

does not exceed the maximum Test Port 2 input level. See be low.

Test Set Model

MS4782A Not Applicable 50 watts MS4782D None (port C1 directly

MS4782D 1000-50 or 1000-52 (20

External Circulator

Used

connected to port C2)

dB isolation)

Test Port 2 Max Power

100 watts

50 watts

MS4782D 1000-53 (22 dB isolation) 79 watts MS4782D Two circulators providing

greater than 23 dB isolation

100 watts

ME7840A OMM 3-1

PREPARING THE SYSTEM OPERATIONS, GENERAL

Step 6. When ready for measurements, cautiously apply DC power to

the AUT.

Step 7. Check that the normally factory-installed RF coaxial “jumper”

cable is installed on the rear panel of the Test Set:

MS4782X: Between Ext Preamp Input and Output

connectors. MS4782D: Between connectors C1 and C2, unless a

circulator is installed.

Step 8. If drain current and/or PAE measurements are desired, the

optional current probe (ANRITSU part number 2000-1067 or

-1085) can be used. Ensure the probe (Figure 3-1) has a fresh battery, and set the zero offset using the MS4623C as follows:

Using Domain softkey, set to Transmission & Reflec tion; using the Display soft key, set for Single Channel; using the Graph Type softkey, set for Real; using the Scale softkey and Data Entry keys, set for 1 mU/Division. Use the Avg key and associated softkeys to set Aver- aging for 10 and IF Bandwidth for 300 Hz. Use the Config key, DATA POINTS and associated softkeys to set for 101 Max Data Points.

Use the Measure softkey and select Ext. Analog In.

c. Turn on the current probe and set it for the desired

range.

d. Adjust the “Zero Adjustment” thumbwheel until the

reading is minimum (typically 0 ±100mU).

e. On the current probe:

Orient the probe such that the “Current Direction”

arrow points away from the power supply.

Place the jaws only over the DC wire (not both wires)..

Unused Connections The EXT. SOURCE and AUX. OUT connectors must be terminated with

50W terminations when not in use.

3-2 ME 7840A OMM

OPERATIONS, GENERAL PREPARING THE SYSTEM

Customer Supplied Power Meter for flat test port power calibration

+/-

CLR

ON/ OFF

Channel

Sensor

Trigger

GPIB

System

Cal/ Zero

GPIB

Customer Supplied

System Controller (PC) with GPIB

MS462X3C DRA Scorpion

Port 3

Port 1

Port 2

To: Ext. Analog In connector

MS4782A or D

CALIBRATOR

Port 3

50 Ohm Terminations

Port 1

Test Port 1

Port 2

Test Port 2

Sensor

Test Set

Customer Supplied

Input

Output

Power Supply for AUT

Amplifier Under Test (AUT)

Optional

Current Probe

Connect when directed by procedure for power calibrations

Figure 3-1. PATS Power On Sequence

ME7840A OMM 3-3

USING PATS SOFTWARE OPERATIONS, GENERAL

3-3 USING PATS

SOFTWARE

PATS software requires a computer with GPIB capability running Win dows 95 or better (98/NT/2000). The software is started by selecting the “Start” button, then “Programs,” “Pats V1.1,” then “Pats” (Figure 3-2).

Select “Pats” to start the software

Select “Readme” to read the description and any late-breaking information

Select “Start” then “Programs” then “Pats V1.1”

Figure 3-2. Starting the PATS Software

Software Organization

The PATS software has two main and three collateral functions. The two main functions, calibration and measurement, are described in Chapters 3 and 4, respectively. The collateral functions, accessed from the PATS program’s top menu, are described in paragraph 3-6.

about the software.

3-4 ME 7840A OMM

OPERATIONS, GENERAL COLLATERAL FUNCTIONS

3-4 COLLATERAL

FUNCTIONS

File The file menu (below) provides for saving files from the PC to the

The PATS software collateral functions are found on the top menu bar un der “Files,” “Tools,” and “Help.” (below)

Top Menu Bar

Same as File, Save Files from PC

Same as File, Recall Files to PC

MS462XC, recalling files from the MS462XC to the PC, and for exiting the system.

Click on File to display a drop-down list (above) that provides the three options described below. PATS Save and Recall functions have the exact same behaviors as the Save/Recall button on the Scorpion. However, in

stead of saving to the Scorpion hard disk or recalling from the hard disk, the PATS software allows users to Save to the PC’s hard disk and Recall from the PC’s hard disk.

ME7840A OMM 3-5

COLLATERAL FUNCTIONS OPERATIONS, GENERAL

Save Cal Files to PC. Displays a dialog box (similar to that shown

for Recall Cal Files from PC, below) showing the cal files stored in the default folder (Temp). This function is useful for saving the front panel setup and calibration data to a file on the PC. The user has the option of overwriting an existing file by selecting an exist ing file from the file listing or creating a new file by typing in a file name. The user must type in a “.cal” extension or the program will report an error. The calibration procedure automatically saves cal files to the PC. The file names of these files is specified in the cali bration specification file (*.txt file).

Recall Cal Files from PC: Displays a dialog box similar to that

shown below with the listing of file name. This function transfers a .cal file from the PC to the Scorpion over the GPIB bus (and names the file a.cal on the Scorpion’s hard disk) and then recalls the front panel setup and cal data from a.cal.

Exit: Exits the PATS software.

Help The “Help” function is not available in the current software. It will be

available in future software versions.

3-6 ME 7840A OMM

OPERATIONS, GENERAL COLLATERAL FUNCTIONS

Tools The “Tools” menu (below) displays a drop-down list that provides three

collateral options described below. The “Run Calibration Files” option is described in Chapter 4.

a. Check Communications to VNA: Runs a test to check

that the VNA communicates with the PC. Run this option first to ensure that the PATS setup is correct and functioning properly. If so, a dialog box appears like that shown below.

ME7840A OMM 3-7

COLLATERAL FUNCTIONS OPERATIONS, GENERAL

b. Calibration File Options: Provides options for finding

and recalling calibration files (below). These files are used to establish test setup for the measurements de scribed in Chapter 5. If no file is selected in an area (S Parameter, Power Sweep, IMD, etc., the associated mea surement will assume the PATS default setting. Clicking on “Find and Recall” button will display the list of files as was shown for “File”, Step 1a, above. Clicking on a filename will cause it to display in the associated win dow in this screen.

c. Limits: Provides for setting limts for S-Parameter mea-

surements.

3-8 ME 7840A OMM

Chapter 4 Operations, Calibration

4-1 INTRODUCTION Measurements always include a degree of uncertainty due to imperfec

tions in the measurement system. The measured value is always a combi nation of the actual value plus the systematic measurement errors. Cali bration, as it applies to network analysis, characterizes the systematic measurement errors and subtracts them from the measured value to ob tain the actual value. Each of the ME7840A measurements requires a cal ibration to account for measurement uncertainties. This chapter de scribes the measurement calibration operations of the Model ME7840A Power Amplifier Test System software.

4-2 OPERATION,

GENERAL

Refer to Chapter 3 for general operation and setup of the ME7840A.

4-3 PROGRAM FILES The PATS software sets up the MS462XC DRA Scorpion according to in-

structions in the “Calibration Specification” files, which are accessed from the “Tools,” “Run Calibration Procedure” function that is described later in this chapter. These are user-editable text files that establish the conditions during calibration and measurement. How to edit these files is described in Appendix A.

The calibration data and Scorpion switch settings that result from follow ing a “Run Calibration Procedure” specification file are saved as a *.cal file. These *.cal files are accessed using the “Tools,” “Calibration File Op tion” function that was described in paragraph 3-6, page 3-8. When one of these files is recalled using the “Calibration File Option,” the Scorpion is ready to acquire correct (calibrated) measurements.

Examples of instrument settings / conditions that reside in the Calibra tion Specification files include:

Sweep start and stop frequencies

Number of data points

Source 1 and 2 power levels

Scorpion IF bandwidth

Averaging

Scorpion display settings

Some of these parameters can also be specified / modified by the User In put window before each actual measurement so long as such modification is consistent with the calibration to be applied.

ME7840A POM 4-1

TEST EQUIPMENT OPERATIONS, CALIBRATION

Alternatively, Scorpion front panel settings may be set manually and ap plied during the automated measurements under PATS software as fol lows:

On the Measurement Window click the Pause button

On the Scorpion front panel press the “Clr / Local” button to take

manual control of the Scorpion. Use Scorpion front panel controls to set the desired settings and/or

to perform a new calibration. (Note: Unless a new calibration is per formed, the manual settings must be consistent with the calibration to be applied).

Use the “Save Cal File to PC.” (Refer to Appendix A for detailed in

formation on how to use the “Calibration Specification Files.”

4-4 TEST EQUIPMENT A power meter, power sensor, and Type N calibration component kit is re

quired for power level and S-parameters calibrations. See Table 1-2, page 1-12.

4-2 ME 7840A POM

OPERATIONS, CALIBRATION GENERAL

4-5 GENERAL Calibration operations are described in this and the following paragraphs

Step 1. Click on “Start,” “Programs,” “Pats V1.1,” then “Pats” (Figure

3-2, page 3-4) to start the software.

The PATS flash screen (below) briefly appears, then the main screen.

The main screen (below) provides access to all software options.

Step 2. Click on “Tools” then “Check Communications to VNA” to en

ME7840A OMM 4-3

POWER LEVEL OPERATIONS, CALIBRATION

sure that the equipment is properly connected to the bus. If so, the following screen will be displayed:

Step 3. Click on “Run Calibration Procedure” to display a list of cali

bration specification files (below). (Refer to paragraph 4-3 for a description of these files.) Running the files is described in succeeding numbered paragraphs.

4-6 POWER LEVEL The A_Power Level.txt specification file provides prompts for a power

level calibration. Proceed as follows:

Step 1. Zero-set the power sensor for accurate measurement in fol

lowing steps.

Step 2. Select “Tools” then “Run Calibration Procedure.”

4-4 ME 7840A OMM

OPERATIONS, CALIBRATION POWER LEVEL

Step 3. Double-click on “A_Power Level.txt.” . The program starts

with a linear power calibration (below).

Step 4. Before hitting the “Next” button, connect the power meter to

at the point where power enters the device-under-test (AUT), which becomes the power reference plane as shown in the prompt.

The use of cables and/or adapters does not effect the final measurement result, if they are in place for the calibration pro cess. The vector error corrections established during the cali bration process eliminates cable and/or adapter effects as long as the ports used are stable and exhibit good repeatability, which is the case if good quality components are used.

Many calibration kits include adapters that are designed to have equal phase length. These parts are called phase equal adapters (PEA). ANRITSU designs in-series adapters (e.g., SMA Connector M-M, M-F, F-F) to be phase insertable when technically possible.

ME7840A OMM 4-5

POWER LEVEL OPERATIONS, CALIBRATION

NOTE

The linear power calibration takes up-to-5 minutes to complete. It calibrates the output power at the refer ence plane for both internal sources (power out of Port 1 then Port 3) according to the target power across the frequency range set in the calibration speci fication file. When the test completes, the “Next” but ton will become available.

Step 5. Press “Next” to calibrate flat power response (below).

NOTE

The flat power calibration also takes less than 1 min ute to complete. It calibrates the output power at the reference plane for both internal sources (power out of Port 1 then Port 3) according to the target power across the frequency range set in the calibration speci fication file. When the test completes, the “Next” but ton will become available.

4-6 ME 7840A OMM

OPERATIONS, CALIBRATION POWER LEVEL

Step 6. Before pressing “Next” disconnect the power sensor and con

nect a throughline between Test Ports 1 and 2 on the MS4782X Test Set, as shown below.

Step 7. Press “Next” to perform a receiver calibration. When this cali

bration finishes, the program returns to the main screen.

ME7840A OMM 4-7

HOT S22 OPERATIONS, CALIBRATION

4-7 HOT S22 The “B_HotS22.txt” file provides prompts for setting up a Hot S

cation file. Hot S port (Port 2) while stimulus is applied to its input port. The prompts cause the Scorpion to be placed into a state where it is ready to make cali brated measurements on the user’s AUT. At the completion of the pro gram, the state information is saved to a *.cal file. To run this program, proceed as follows.

Step 1. Select “Tools” then “Run Calibration Procedure.” Step 2. Double-click on “C_Hot S22.txt” to begin the Hot S

setup. Follow the prompt and connect open, short, and load to Port 2 as directed.

is a return loss measurement of an amplifier’s output

specifi

cal file

4-8 ME 7840A OMM

OPERATIONS, CALIBRATION HOT S22

Step 3. Press “Next” for the next prompt (below). The 3653 or 3753LF

Calibration Kits contain a disk with calibration data. The data has to be installed from the MS462C front panel. To do so, place the floppy disk from the kit into the MS462XC disk drive. Press the Cal key then COMPONENTS UTILITIES/IN STALL KIT INFO FROM FLOPPY DISK. softkeys.

Step 4. Press “OK” for the next step (below). Connect the Open to

Port 2.

Step 5. Press “OK” for the next step (below). Connect the Short to

Port 2.

ME7840A OMM 4-9

HOT S22 OPERATIONS, CALIBRATION

Step 6. Press “OK” for the next step (below). Connect the Load to Port

Step 7. Press “OK” to complete the Hot S

calibration.

4-10 ME 7840A OMM

OPERATIONS, CALIBRATION S-PARAMETERS CAL

4-8 S-PARAMETERS

CAL

The “C_S-Parameters Cal.txt” file to provides prompts for setting up S-parameters specification file. The prompts cause the Scorpion to be placed into a state where it is ready to make calibrated measurements on the user’s AUT. At the completion of the program, the state information is saved to a *.cal file. To run this program, proceed as follows.

Step 1. Select “Tools” then “Run Calibration Procedure.” Step 2. Double-click on “D_S Parameters.txt” to begin the file

setup.Follow the prompt and connect open, short, and load to Ports 1 and 2 as directed.

ME7840A OMM 4-11

S-PARAMETERS CAL OPERATIONS, CALIBRATION

Step 3. Press “Next” for the next step (below). The 3653 or 3753LF

Step 4. Press “OK” for the next step (below). Connect the Broadband

Load on Test Ports 1 and 2 on the ME7840A Test Set.

Step 5. Press “OK” for the next step (below). Connect the Open to

Test Port1 and the Short to Test Port 2.

4-12 ME 7840A OMM

OPERATIONS, CALIBRATION S-PARAMETERS CAL

Step 6. Press “OK” for the next step (below). Connect the Short to

Test Port 1 and the Open to Test Port 2.

Step 7. Press “OK” for the next step (below). Connect the Throughline

between Test Ports 1 and 2.

ME7840A OMM 4-13

S-PARAMETERS CAL OPERATIONS, CALIBRATION

Step 8. Press “OK” to complete the S Parameters calibration (below).

4-14 ME 7840A OMM

OPERATIONS, CALIBRATION CAL FILE SETUP

4-9 CAL FILE SETUP The “D_Cal File Setup.txt” file provides prompts for setting up One-tone

power sweep, IMD, Two-Tone Power Sweep, and Harmonic specification file. The prompts cause the Scorpion to be placed into a state where it is ready to make calibrated measurements on the user’s AUT. At the com pletion of the program, the state information is saved to a *.cal file. To run this program, proceed as follows.

Step 1. Select “Tools” then “Run Calibration Procedure.” Step 2. Double-click on “B_Cal Files Setup.txt.” to begin with the file

setup for a Transmission Frequency Response (S One-Tone Power Sweep. Connect a throughline when di rected in a following step.

cal) for

ME7840A OMM 4-15

CAL FILE SETUP OPERATIONS, CALIBRATION

Step 3. Press “Next” for the next prompt (below). The 3653 or 3753LF

STALL KIT INFO FROM FLOPPY DISK. softkeys. Press OK when ready to proceed.

Step 4. Connect the Throughline between Test Ports 1 and 2 on the

MS4782X Test Set.

4-16 ME 7840A OMM

OPERATIONS, CALIBRATION CAL FILE SETUP

Step 5. Press “OK” to continue to the IMD cal file setup prompt (be

low). Follow the prompt and connect a throughline between Test Ports 1 and 2 on the MS4782X Test Set.

ME7840A OMM 4-17

CAL FILE SETUP OPERATIONS, CALIBRATION

Step 6. Press “Next” to begin the Power Sweep cal file setup (below).

4-18 ME 7840A OMM

OPERATIONS, CALIBRATION CAL FILE SETUP

Step 7. Press “Next” to perform Harmonic Cal File Setup calibration

(below).

Step 8. Press “Next” to end the calibration and return to the main

screen.

ME7840A OMM 4-19/4-20

Chapter 5 Operations, Measurement

5-1 INTRODUCTION This chapter describes the five measurements available with the

ME7840A software: S-Parameters, Power Sweep, IMD (intermodulation distortion), Harmonics, and Hot S

5-2 OPERATION,

GENERAL

5-3 MEASUREMENT

CALIBRATION

Refer to Chapter 3 for general operation and setup of the ME7840A.

Measurements always include a degree of uncertainty due to imperfec tions in the measurement system. The measured value is always a combination of the actual value plus the systematic measurement errors. Calibration, as it applies to network analysis, characterizes the systematic measurement errors and subtracts them from the measured value to obtain the actual value. Each of the ME7840A measurements requires a calibration to account for measurement uncertainties. Refer to Chapter 4 for measurement calibration procedures.

5-4 GENERAL Measurements can be approached from two directions: calibration(s) com-

pleted, calibration(s) not completed.

Calibration(s) Completed

Proceed as follows:

Step 1. Click on “Tools,” and open “Check Communications to VNA.” Step 2. Verify the communications are correct. Step 3. Click on “Tools,” and open “Calibration File Options.” Step 4. Click on “Find and Recall” and recall a *.cal file for each mod

ule. Filenames are listed below and shown in graphic below last listing.

S Parameters: “S_Parameters_1.cal”

Power Sweep (2T): “PowSweep_1.cal”

Power Sweep (1T): “PSweep1T_1.cal”

C3, IMD: “Imd_1.cal”

C4, Harmonics: “Harmonics_1.cal”

ME7840A OMM 5-1

GENERAL OPERATIONS, MEASUREMENT

C5, Hot S

Step 5. Select appropriate file “Open” (below).

¾ “Hots22_1.cal”

Calibration(s) Not Completed

Sometimes users may wish to run a measurement using default settings, that is, without spending the time required to calibrate. The procedure below gives instructions.

Step 1. Click on “Tools,” and open “Check Communications to VNA.” Step 2. Verify the communications are correct. Step 3. Click on “Tools,” and open “Calibration File Options.” Step 4. Clear the text for all modules then select “Return.” Step 5. Press any measurement button on main menu and measure

ment will be run using “PATS software” default values: Cali bration Off on MS462XC and MS462XC Default parameters in place. The default values are shown below.

5-2 ME 7840A OMM

OPERATIONS, MEASUREMENT GENERAL

D1, S-Parameters and Hot S

Points = 201

Start Frequency = 800 MHz

Stop Frequency = 2400 MHz

Input Power=0dB

D2, Power Sweep (2 tone power sweep)

Main Tone = 950 MHz

Offset = 971 kHz

Start Power = -15 dBm

Stop Power=0dBm

Data Points = 21

D3, IMD

Main Tone = 900 MHz

ü Offset Frequency = 977 kHz ü Input Power=0dBm ü IMD Order = 9

n D4, Harmonics

ü Start Frequency = 100 MHz ü Stop Frequency = 3000 MHz ü Main Tone = 800 MHz ü Input Power=0dBm

ME7840A OMM 5-3

S-PARAMETERS OPERATIONS, MEASUREMENT

5-5 S-PARAMETER TESTS:

21,S11,S22,S12

, ALL

This test measures the scattering parameters (S-parameters). The test module comprises six tests: S11,S12,S21,S22, and ALL. (The K Factors test is described in paragraph 5-6.) In each case, the measurement screens are the similar. This procedure will present a test screen for the “S

” measurement and will describe certain differences at the end of the

procedure.

Procedure.

Prepare the ME7840A as shown in Chapter 3. Enter the appropriate test values in the displayed

User Input screen. The input fields are described below: The inputs required for this test are de

scribed below.

S-Parameter: Drop down options. Set to S21for

this procedure. Other selections include S S

, ALL, and K Factor (paragraph 5-6).

Data Points: Drop down options - number of data

11,S12

points in frequency sweep.

Frequency 1 (MHz): Lower frequency or start fre-

quency.

Frequency 2 (MHz): Upper frequency or stop fre-

quency.

Input Power (dBm):Input power level, in dBm.

IF Bandwidth (Hz):Intermediate frequency band-

width for test, in Hertz.

Test Set Setting: Byte value for setting test set

attenuation and source switch (below).

Internal Source Value External Source Value

0dB 8 0dB 0 10 dB 9 10 dB 1 20 dB 10 20 dB 2 30 dB 11 30 dB 3 40 dB 12 40 dB 4 50 dB 13 50 dB 5 60 dB 14 60 dB 6 70 dB 15 70 dB 7

5-4 ME 7840A OMM

OPERATIONS, MEASUREMENT S-PARAMETERS

Select Start Test: Observe that the test screen

(Figure 5-1) appears.

Figure 5-1. S-Parameters Test Screen for S

Button Panel Options:

Print: Prints a copy of the screen graphic to a printer.

Write Data: Two data files are written to the C:\Program Files\Pats\Datafiles folder; the file name will have a time stamp. One datafile has a “.csv” file extension and the other has a “.s2p” file extension. For example: “S17-16-19-29.csv (and s2p)” was created on the 17th day of the month at 4:19 PM and 49 seconds. CSV and S2P files are comma sepa

rated text and can be opened in the Windows Microsoft Excel spreadsheet.

Upper Limit/Lower Limit: Limit values as set using Tools menus (Chapter 4).

Return: Returns to the main PATS screen.

ME7840A OMM 5-5

S-PARAMETERS OPERATIONS, MEASUREMENT

Change Params: Returns to User Input

screen. Autoscale Checkbox: Turns autoscale on or

off. Autoscale automatically scales the mea surement results.

Reset/Zoom: Disabled for this test.

Max/Min: Type in maximum and minimum

display value. Use Rescale after changing val ues.

Rescale: Rescales the measurement results.

Markers Screen Options for S

M1: Turnsmarker on or off (checked or un

11,S21,S12,S22

checked). If on: Slider moves marker between data points, and window below displays marker frequency and amplitude values amplitude value at the marker.

M2: Same as above.

M3: Same as above.

M4: Same as above.

Markers Screen Options for ALL (left):

Marker Slider: Moves marker between data points.

Frequency Display: Displays marker fre quency.

S11: S11input return loss.

S21: S21gain.

S12: S12output isolation.

S22: S22output return loss.

(left):

5-6 ME 7840A OMM

OPERATIONS, MEASUREMENT S-PARAMETER TEST: K FACTOR

5-6 S-PARAMETER

TEST: K FACTOR

This test describes the K Factors measurement. This measurement is described in Chapter 1, paragraph 1-10.

Procedure.

Prepare the ME7840A as shown in Chapter 3. Enter the appropriate test values in the displayed

User Input screen. The input fields are described below: The inputs required for this test are de

scribed below.

S-Parameter: Drop down options. K Factor for

this measurement.

Data Points: Drop down options - number of data

points in frequency sweep.

Frequency 1 (MHz): Lower frequency or start fre-

quency.

Frequency 2 (MHz): Upper frequency or stop fre-

quency.

Input Power (dBm):Input power level, in dBm.

IF Bandwidth (Hz):Intermediate frequency band-

width for test, in Hertz.

Test Set Setting: Byte value for setting test set

attenuation and source switch (below).

Internal Source Value External Source Value

0dB 8 0dB 0 10 dB 9 10 dB 1 20 dB 10 20 dB 2 30 dB 11 30 dB 3 40 dB 12 40 dB 4 50 dB 13 50 dB 5 60 dB 14 60 dB 6 70 dB 15 70 dB 7

ME7840A OMM 5-7

S-PARAMETER TEST: K FACTOR OPERATIONS, MEASUREMENT

Select Start Test: Observe that the test screen

(Figure 5-1) appears.

Figure 5-2. S-Parameters Test Screen for S

Button Panel Options:

Print: Prints a copy of the screen graphic to a printer.

rated text and can be opened in the Windows Microsoft Excel spreadsheet.

Upper Limit/Lower Limit: Limit values as set using Tools menus (Chapter 4).

Return: Returns to the main PATS screen.

5-8 ME 7840A OMM

OPERATIONS, MEASUREMENT S-PARAMETER TEST: K FACTOR

Change Params: Returns to User Input

screen. Autoscale Checkbox: Turns autoscale on or

off. Autoscale automatically scales the mea surement results.

Reset/Zoom: Disabled for this test.

Max/Min: Type in maximum and minimum

display value. Use Rescale after changing val ues.

Rescale: Rescales the measurement results.

Markers Screen Options for K Factor (left):

Marker Slider: Moves marker between data

points. Frequency Display: Displays marker fre

quency. KF: Displays the K factor value. K factor is a

stability factor of interest for amplifier designers.

ME7840A OMM 5-9

S-PARAMETERS OPERATIONS, MEASUREMENT

5-7 POWER SWEEP, TWO

TONE

Single Frequency Power Sweep

This measurement module has three variations of possible Measurement Types: Power Sweep (single frequency), Multi Frequency Power Sweep, Gain and IMD.

Procedure.

Prepare the ME7840A as shown in Chapter 3. Enter the appropriate test values in the displayed

User Input screen. The input fields are described below:

Measurement Type: Drop down options showing

Power Sweep (single frequency), Multi Freq Power Sweep (uses 3 frequencies), Gain & IMD. Set to “Power Sweep ” for this test.

Main Tone (MHz): CW Frequency setting for

source 1.

Offset (kHz): Offset frequency for Source 2

(Source 2 will be set to Main Tone + Offset).

Start Power (dBm): Power will be swept starting

at the start power (input RF power to AUT). Both sources are simultaneously set to each power setting. The stop power is also entered in the “to” window.

Data Points: Number of data points in power

sweep.

Increment Power (dBm): Value to increment

power for each data point (calculated and dis

played only).

Source Attn (dB):Value of Source attenuation, be

tween 0 and -70 (calculated and displayed only).

Drain Current Checkbox: When checked the

drain current is measured and power added effi

ciency is calculated and displayed.

PStop Level (dB):Provides the ability to set the

PStop value based on the level of gain compres

sion. Drop down options include compression levels of 1 dB through 10 dB in 1 dB increments, and OFF. If OFF is selected, then the P Stop equals the value entered in the “to” window above. If the se lected compression occurs, PStop for all subse quent power sweeps is reset to one increment be fore the P

value where this compression level is

reached.

5-10 ME 7840A OMM

OPERATIONS, MEASUREMENT POWER SWEEP, TWO TONE

Test Set Setting: Byte value for setting test set

attenuation and source switch (below).

Internal Source Value External Source Value

0dB 8 0dB 0 10 dB 9 10 dB 1 20 dB 10 20 dB 2 30 dB 11 30 dB 3 40 dB 12 40 dB 4 50 dB 13 50 dB 5 60 dB 14 60 dB 6 70 dB 15 70 dB 7

ME7840A OMM 5-11

POWER SWEEP, TWO TONE OPERATIONS, MEASUREMENT

Select Start Test and observe that the test screen (Figure 5-3) appears.

Figure 5-3. Single Frequency Power Sweep Test

Button Panel Options:

Print: Prints a copy of the screen graphic to a printer.

Write Data: Excel data is written to C:\Pro

gram Files\Pats\Datafiles - the file name will have a time stamp. For example: “S17-16-19-29.csv” was created on the 17th day of the month at 4:19 PM and 49 seconds. CSV files are comma separated text and can be opened iin Windows Excel.

Pause/Go: Stops data transfer from VNA to PC and places MS4623C in “Local” mode.

Return: Returns to the main PATS screen.

Change Params: Returns to User Input screen.

5-12 ME 7840A OMM

OPERATIONS, MEASUREMENT POWER SWEEP, TWO TONE

Autoscale Checkbox: Turns autoscale on or

off. Autoscale automatically scales the mea surement results.

Reset/Zoom: Disabled for this test.

Max/Min: Type in maximum and minimum

display value. Use Rescale after changing val ues.

Rescale: Rescales the measurement results.

Pause/Go: Pause stops data transfer from

VNA to PC and places MS462XC in “Local” mode. Go starts data transfer to MS462XC in “Remote” mode.

Markers Screen Options (left):

Markers slider: Moves marker between data

points. Power In Reading: Indicates the input power

value. Pout F1: Power output at frequency 1.

Pout F2: Power output at frequency 2.

q IM3U: Intermodulation product 3 upper side-

band

IM3L:Intermodulation product 3 lower sideband

IM5U:Intermodulation product 5 upper sideband

IM5L:Intermodulation product 5 lower side band

IM7U:Intermodulation product 7 upper side band

IM7L:Intermodulation product 7 lower side band

PAE: Power-added efficiency percentage.

Drain: Drain current value.

NOTE

PAE and Drain may be on or off according to check box in parameter screen.

ME7840A OMM 5-13

POWER SWEEP, TWO TONE OPERATIONS, MEASUREMENT

Multiple Frequency Power Sweep

Procedure.

Measurement Type: Drop down options. Set to

“Multi Freq Power Sweep ” for this test.

Main Tone (MHz): CW Frequency setting for

source 1. The user may set a lower tone and upper tone. The software will sweep three frequencies (the two input plus one between) and the RF input power to produce the display data.

Offset (kHz): Offset frequency for Source 2

(Source 2 will be set to Main Tone + Offset).

Start Power (dBm): Power will be swept starting

at the start power (input RF power to AUT). Both sources are simultaneously set to each power set ting. The stop power is also entered in the “to” win dow.

Data Points: Number of data points in power

sweep.

Increment Power (dBm): Value to increment

power for each data point (calculated and displayed only).

Source Attn (dB):Value of Source attenuation, be-

tween 0 and -70 (calculated and displayed only).

Drain Current Checkbox: When checked the

drain current is measured and power added efficiency is calculated and displayed.

PStop Level (dB):Provides the ability to set the

PStop value based on the level of gain compres sion. Drop down options include compression levels of 1 dB through 10 dB in 1 dB increments, and OFF. If OFF is selected, then the P Stop equals the value entered in the “to” window above. If the se lected compression occurs, PStop for all subse quent power sweeps is reset to one increment be fore the P

value where this compression level is

reached.

5-14 ME 7840A OMM

OPERATIONS, MEASUREMENT POWER SWEEP, TWO TONE

Test Set Setting: Byte value for setting test set

attenuation and source switch (below).

Internal Source Value External Source Value

0dB 8 0dB 0 10 dB 9 10 dB 1 20 dB 10 20 dB 2 30 dB 11 30 dB 3 40 dB 12 40 dB 4 50 dB 13 50 dB 5 60 dB 14 60 dB 6 70 dB 15 70 dB 7

ME7840A OMM 5-15

POWER SWEEP, TWO TONE OPERATIONS, MEASUREMENT

Select Start Test. Observe that the test screen (Fig ure 5-4) appears.

Figure 5-4. Multiple Frequency Power Sweep Test

Button Panel Options:

Print: Prints a copy of the screen graphic to a printer.

Write Data: Excel data is written to C:\Pro gram Files\Pats\Datafiles - the file name will have a time stamp. For example: “S17-16-19-29.csv” was created on the 17th day of the month at 4:19 PM and 49 seconds. CSV files are comma separated text and can be opened iin Windows Excel.

5-16 ME 7840A OMM

OPERATIONS, MEASUREMENT POWER SWEEP, TWO TONE

Pause/Go: Stops data transfer from VNA to

PC and places MS4623C in “Local” mode. Return: Returns to the main PATS screen.

Change Params: Returns to User Input

screen. Y1, Y2: Provides for rescaling the left or right

axis. Rescale: Rescales the measurement results.

Max/Min: Type in maximum and minimum

display value. Use Rescale after changing val ues.

Markers Screen Options (left):

Markers slider: Moves marker between data

points. Pout F1: Power output at frequency 1.

Pout F2: Power output at frequency 2.

IM3U: Intermodulation product 3 upper side-

band IM3L:Intermodulation product 3 lower side-

band

IM5U:Intermodulation product 5 upper sideband

IM5L:Intermodulation product 5 lower sideband

IM7U:Intermodulation product 7 upper side band

IM7L:Intermodulation product 7 lower side band

PAE: Power-added efficiency percentage.

Drain: Drain current value.

ME7840A OMM 5-17

POWER SWEEP, TWO TONE OPERATIONS, MEASUREMENT

Gain and IMD Power Sweep

Procedure:

Measurement Type: Drop down options. Set to

“Gain and IMD ” for this test.

Main Tone (MHz): CW Frequency setting for

source 1.

Offset (kHz): Offset frequency for Source 2

(Source 2 will be set to Main Tone + Offset)

Start Power (dBm): Power will be swept starting

at the start power (input RF power to AUT). Both sources are simultaneously set to each power set

ting. The stop power is also entered in the “to” win dow.

Data Points: Number of data points in power

sweep.

Increment Power (dBm): Value to increment

power for each data point (calculated and displayed only).

n Source Attn (dB):Value of Source attenuation, be-

tween 0 and -70 (calculated and displayed only).

Drain Current Checkbox: When checked the

drain current is measured and power added efficiency is calculated and displayed.

PStop Level (dB):Provides the ability to set the

PStop value based on the level of gain compres

value where this compression level is

reached.

5-18 ME 7840A OMM

OPERATIONS, MEASUREMENT POWER SWEEP, TWO TONE

Test Set Setting: Byte value for setting test set

attenuation and source switch (below).

Internal Source Value External Source Value

0dB 8 0dB 0 10 dB 9 10 dB 1 20 dB 10 20 dB 2 30 dB 11 30 dB 3 40 dB 12 40 dB 4 50 dB 13 50 dB 5 60 dB 14 60 dB 6 70 dB 15 70 dB 7

ME7840A OMM 5-19

POWER SWEEP, TWO TONE OPERATIONS, MEASUREMENT

Select Start Test. Observe that the test screen (Fig ure 5-5) appears.

Figure 5-5. Power Sweep Gain and IMD Test Screen, with Markers Selected

Button Panel Options:

Print: Prints a copy of the screen graphic to a printer.

Write Data: Excel data is written to C:\Pro

Pause/Go: Stops data transfer from VNA to PC and places MS4623C in “Local” mode.

5-20 ME 7840A OMM

OPERATIONS, MEASUREMENT POWER SWEEP, TWO TONE

Return: Returns to the main PATS screen.

Change Params: Returns to User Input

screen. Y1, Y2: Provides for rescaling the left or right

axis. Rescale: Rescales the measurement results.

Max/Min: Type in maximum and minimum

display value. Use Rescale after changing val ues.

Markers Screen Options (left):

Markers slider: Moves marker between data

points. Gain dB: Gain (or S21) is measured at each

CW tone as the power is swept The measure ment is made in IMD mode. The Gain is actu ally measured by calculating the difference between Power In (in dBm) and Power Out (in dBm). Calibration applied is Linear Power Cal and Receiver Cal. (Could also be called Gain and compression measurement). The displayed Power In level is the power of each input tone.

Gain dB: See above.

IM3U: Intermodulation product 3 upper sideband

IM3L:Intermodulation product 3 lower sideband

IM5U:Intermodulation product 5 upper side band

IM5L:Intermodulation product 5 lower side band

IM7U:Intermodulation product 7 upper side band

IM7L:Intermodulation product 7 lower side band

PAE: Power-added efficiency percentage.

Drain: Drain current value.

ME7840A OMM 5-21

POWER SWEEP, ONE TONE OPERATIONS, MEASUREMENT

5-8 POWER SWEEP, ONE

TONE

Single Frequency Power Sweep

This measurement module has three variations of possible Measurement Types: Power Sweep (single frequency), Multi Frequency Power Sweep, Gain and IMD.

Procedure.

Prepare the ME7840A as shown in Chapter 3. Enter the appropriate test values in the displayed

User Input screen. The input fields are described below:

Measurement Type: Drop down options set to

“Gain and Phase ” for this test.

Main Tone (MHz): CW Frequency setting for

source 1.

Start Power (dBm): Power will be swept starting

at the start power (input RF power to AUT). Both sources are simultaneously set to each power setting. The stop power is also entered in the “to” window.

Data Points: Number of data points in power

sweep.

Increment Power (dBm): Value to increment

power for each data point (calculated and displayed only).

Source Attn (dB):Value of Source attenuation, be

tween 0 and -70 (calculated and displayed only).

Drain Current Checkbox: When checked the

drain current is measured and power added effi

ciency is calculated and displayed.

PStop Level (dB):Provides the ability to set the

PStop value based on the level of gain compres

value where this compression level is

reached.

5-22 ME 7840A OMM

OPERATIONS, MEASUREMENT POWER SWEEP, ONE TONE

Test Set Setting: Byte value for setting test set

attenuation and source switch (below).

Internal Source Value External Source Value

0dB 8 0dB 0 10 dB 9 10 dB 1 20 dB 10 20 dB 2 30 dB 11 30 dB 3 40 dB 12 40 dB 4 50 dB 13 50 dB 5 60 dB 14 60 dB 6 70 dB 15 70 dB 7

ME7840A OMM 5-23

POWER SWEEP, ONE TONE OPERATIONS, MEASUREMENT

Select Start Test and observe that the test screen (Figure 5-3) appears.

Figure 5-6. Single Frequency Power Sweep Test

Button Panel Options:

Print: Prints a copy of the screen graphic to a printer.

Write Data: Excel data is written to C:\Pro

Pause/Go: Stops data transfer from VNA to PC and places MS4623C in “Local” mode.

Return: Returns to the main PATS screen.

Change Params: Returns to User Input screen.

5-24 ME 7840A OMM

OPERATIONS, MEASUREMENT POWER SWEEP, ONE TONE

Autoscale Checkbox: Turns autoscale on or

off. Autoscale automatically scales the mea surement results.

Max/Min: Type in maximum and minimum

display value. Use Rescale after changing val ues.

Rescale: Rescales the measurement results.

Markers Screen Options (left):

Markers slider: Moves marker between data

points. Gain: Gain is in dB and is the Gain, measured

at the CW frequency for each power level in the power sweep. (Could also be called Gaini com pression measurement.) The displayed power in the power of 1 input tone.

Phase: Phase is an AM/PM measurement/dis-

play - the phase at the initial power level of the power sweep is used as a normalized level (zero). As the power is swept, the Phase displayed is the difference from the normalized value.

ME7840A OMM 5-25

IMD OPERATIONS, MEASUREMENT

5-9 IMD This test measures inter-modulation distortion.

Procedure

Prepare the ME7840A as shown in Chapter 3. Enter the appropriate test values in the displayed

User Input screen. The input fields are described below:

Measurement Type: Already set to “IM” for IMD

– input disabled.

Main Tone (MHz): CW Frequency setting for

source 1.

Offset (kHz): Offset frequency for Source 2

(Source 2 will be set to Main Tone + Offset).

Input Power (dBm): Input RF power to AUT.

IMD Order:NEED

Test Set Setting: Byte value for setting test set

attenuation and source switch:

Internal Source Value External Source Value

0dB 8 0dB 0 10 dB 9 10 dB 1 20 dB 10 20 dB 2 30 dB 11 30 dB 3 40 dB 12 40 dB 4 50 dB 13 50 dB 5 60 dB 14 60 dB 6 70 dB 15 70 dB 7

5-26 ME 7840A OMM

OPERATIONS, MEASUREMENT IMD

Select Start Test. Observe that the test screen (Fig ure 5-7) appears.

Figure 5-7. Intermodulation Distortion Test Screen

Button Panel Options:

Print: Prints a copy of the screen graphic to a printer.

Write Data: Excel data is written to C:\Pro

Pause/Go: Stops data transfer from VNA to PC and places MS4623C in “Local” mode.

ME7840A OMM 5-27

IMD OPERATIONS, MEASUREMENT

Return: Returns to the main PATS screen.

Change Params: Returns to the User In

put screen. Rescale: Rescales the measurement results.

Max/Min: Type in maximum and minimum

display value. Use Rescale after changing val ues.

Autoscale Checkbox: Turns autoscale on or

off. Autoscale automatically scales the mea surement results.

Markers Screen Options (left):

M1-M2 Checkbox: Turns M1-M2 feature on or

off. M1-M2 Readout: Displays the value of M1 mi

nus M2. M1 Slider: Moves M1 between displayed har-

monics. A blue + symbol appears on the top of the selected harmonic.

M2-M1Checkbox: TurnsM2-M1 feature on or

off.

M2-M1 Readout: Displays the value of M2 minus M1.

M2-M1 Slider: Moves M2 between displayed harmonics. A blue + symbol appears on the top of the selected harmonic.

5-28 ME 7840A OMM

OPERATIONS, MEASUREMENT HARMONICS

5-10 HARMONICS The harmonics test measures and displays the harmonics in the device

under test.

Procedure

Prepare the ME7840A as shown in Chapter 3. Enter the appropriate test values in the displayed

User Input screen. The input fields are described below:

Measurement Type: Already set to “HA” for Har

monics – input disabled.

Start Frequency (MHz): Lower frequency to be

displayed. Typically set to a value less than or equal to the main tone.

Stop Frequency (MHz): Upper Frequency to be

displayed. Set to a value less than the system’s maximum frequency (for example, for MS4623C set to a max of 5000 MHz).

Main Tone (MHz): CW Frequency setting for

source 1.

Input Power: Input RF power to AUT.

Test Set Setting: Byte value for setting test set

attenuation and source switch:

Internal Source Value External Source Value

0dB 8 0dB 0 10 dB 9 10 dB 1 20 dB 10 20 dB 2 30 dB 11 30 dB 3

40 dB 12 40 dB 4 50 dB 13 50 dB 5 60 dB 14 60 dB 6 70 dB 15 70 dB 7

ME7840A OMM 5-29

HARMONICS OPERATIONS, MEASUREMENT

Select Start Test and observe that the test screen (Figure 5-8) appears.

Figure 5-8. Initial Harmonics Test Screen

Button Panel Options:

Print: Prints a copy of the screen graphic to a printer.

Write Data: Excel data is written to C:\Pro

Pause/Go: Stops data transfer from VNA to PC and places MS4623C in “Local” mode.

Return: Returns to the main PATS screen.

5-30 ME 7840A OMM

OPERATIONS, MEASUREMENT HARMONICS

Change Params: Returns to User Input

screen. Autoscale Checkbox: Turns autoscale on or

off. Autoscale automatically scales the mea surement results.

Max/Min: Type in maximum and minimum

display value. Use Rescale after changing val ues.

Rescale: Rescales the measurement results.

Markers Screen Options (left):

M1-M2 Checkbox: Turns M1-M2 feature on or

off. M1-M2 Readout: Displays the value of M1 mi

nus M2. M1 Slider: Moves M1 between displayed har

monics. A blue + symbol appears on the top of the selected harmonic.

M2-M1Checkbox: TurnsM2-M1 feature on or

off. M2-M1 Readout: Displays the value of M2 mi-

nus M1.

M2-M1 Slider: Moves M2 between displayed harmonics. A blue + symbol appears on the top of the selected harmonic.

ME7840A OMM 5-31

HOT S22 OPERATIONS, MEASUREMENT

5-11 HOT S22 The output match of a power amplifier under excited conditions is critical

information that has a strong bearing on efficiency, output power, stabil ity, and often the economic viability of the design. One way of dealing with this information—primarily in power devices operating well away from compression or in somewhat matched amplifiers— is a quasi-linear measurement of S Such a measurement is termed hot S

while the amplifier is operating under normal drive.

, and it can provide (1) some infor

mation on the degree of mismatch in the system, (2) potential operational stability, and (3) the effects of the amplifier’s performance on subsequent stages or an antenna. In the PATS, the Hot S

measurement uses one

source (Source 2) to provide stimulus to the amplifier-under-test (AUT) input port while the other source (Source 1) provides a pilot tone injected to the output of the AUT for measuring S

at the AUT output port.

Procedure

Prepare the ME7840A as shown in Chapter 3. Enter the appropriate test values in the displayed

User Input screen. The input fields are described below:

n S Parameter: Already set to “Hot S

” for test –

input disabled.

Data Points: Drop down options - number of data

points in frequency sweep.

Frequency 1 (MHz): Lower frequency to be dis-

played. Typically set to a value less than or equal to the main tone. Can be reset using slider control.

Frequency 2 (MHz): Upper Frequency to be dis

played. Set to a value less than the system’s maxi mum frequency (for example, for MS4623C set to a max of 5000 MHz). Can be reset using slider con trol.

Src 1 Power (dBm):Source 1 power level, in dBm.

IF Bandwidth (Hz):Intermediate frequency

value, in Hertz.

5-32 ME 7840A OMM

OPERATIONS, MEASUREMENT HOT S22

Test Set Setting: Byte value for setting test set

attenuation and source switch:

Internal Source Value External Source Value

0dB 8 0dB 0 10 dB 9 10 dB 1 20 dB 10 20 dB 2 30 dB 11 30 dB 3 40 dB 12 40 dB 4 50 dB 13 50 dB 5 60 dB 14 60 dB 6

The PATS Hot S

measurement provides the following additional fea-

tures:

Ability to vary the AUT input excitation power level (Source 2 of

Scorpion, at Port 1) while observing the Hot S

response. Pressing

“U” on the PC keyboard increases the input excitation power level (U for up). Pressing “D” decreases it. The actual input excitation power in dBm is displayed on the PC screen.

Ability to turn the amplifier input excitation source (Source 2 of Scorpion, at Port 1) ON and OFF while observing the Hot S

. Shift

S turns Source 2 OFF. S turns it ON. This basically provides a comparison of “Cold” S

Ability to capture the Hot S22plot at a given excitation level (his

with Hot S22.

tory plot on the PC screen) for comparison with other levels. Press “C” captures (creates history plot). Press “Shift + C” removes it.

Ability to show Hot S22Smith Chart on the Scorpion Screen while Log Magnitude is displayed on the PC screen. The Scorpion display can be selected by Scorpion front panel controls during the mea

surement.

The level of the tone injected to the output of the AUT (Source 1 of Scorpion, at Port 2) can be set by the user via the “Specification File”.

ME7840A OMM 5-33

HOT S22 OPERATIONS, MEASUREMENT

Select Start Test and observe that the test screen (Figure 5-9) appears.

Figure 5-9. Hot S22Test Screen

Button Panel Options:

Print: Prints a copy of the screen graphic to a printer.

Write Data: Excel data is written to C:\Pro

Pause/Go: Stops data transfer from VNA to PC and places MS4623C in “Local” mode.

Upper Limit/Lower Limit: Limit values as set using Tools menus (Chapter 4).

Return: Returns to the main PATS screen.

5-34 ME 7840A OMM

OPERATIONS, MEASUREMENT HOT S22

Change Params: Returns to User Input

screen. Autoscale Checkbox: Turns autoscale on or

off. Autoscale automatically scales the mea surement results.

Reset/Zoom: Disabled for this test.

Max/Min: Type in maximum and minimum

display value. Use Rescale after changing val ues.

Rescale: Rescales the measurement results.

Markers Screen Options (left):

M1: Turnsmarker on or off (checked or un

checked). If on: Slider moves marker between data points, and window below displays marker frequency and amplitude values amplitude value at the marker.

M2: Same as above.

M3: Same as above.

M4: Same as above.

ME7840A OMM 5-35/5-36

Chapter 6 Performance Verification Procedure

6-1 INTRODUCTION The following are the specific tests that should be used to verify the per

formance of the Power Amplifier Test System (PATS)

Source Output Level Accuracy Test

Return Loss Measurement Confidence Test

System Dynamic Range Test

Receiver Magnitude Display Linearity Test

6-2 CONVENTIONS In the tests in this chapter, instructions will direct use front panel hard

keys and softkeys. The hard keys and softkeys will appear in a different typeface. For example:

Step 1. Press the Utility key and select:

DIAGNOSTICS TROUBLESHOOTING MORE VERIFY ALC CALIBRATON

The Utility key is a front panel hard key and DIAGNOSTICS, TROUBLE SHOOTING, MORE, and VERIFY ALS CALIBRATION are all softkeys.

6-3 TEST

EQUIPMENT

The following equipment is required to performthe verification proce dures.

ANRITSU Model ML243XA Power Meter

ANRITSU Model MA247XA Power Sensor

ANRITSU Model 3653 or 3753LF N connector Calibration Kit

ANRITSU Model SC5237 6 dB Offset Termination

ANRITSU Model SC5270 20 dB Offset Termination

ANRITSU Model 11N50B Power Divider

ANRITSU Model 3670NN50-2 Cable

ANRITSU Model 34NN50A Adapter

ANRITSU 2100-2 GPIB cable

ME7840A OMM 6-1

SOURCE OUTPUT ACCURACY PERFORMANCE VERIFICATION

6-4 SOURCE OUTPUT

ACCURACY

Setup:

This test verifies the source output accuracy of the MS462XC. The test procedure uses the Power ALC Verification built-in function of the MS462XC Basic Measurement software.

Step 1. Connect a GPIB cable between the power meter GPIB connec

tor and the MS462XC dedicated GPIB connector, as shown in Figure 6-1.

Step 2. Turn on the MS462XC VNMS and allow it to warm-up at

least one hour.

00000001

WARNING

NOOPERATORSERVICE-

ABLEPARTSINSIDE.

REFERSERVICINGTO QUALIFIEDPERSONNEL.

N274

PARALLELPRINTER

RS232

IEEE488.2

GPIB

Dedicated

GPIB

Madein UK

GPIB/ IEEE 488

WARNING

NOOPERATORSERVICE-

ABLEPARTSINSIDE.

CALIBRATOR

SerialPort

Ethernet

CAUTION

85-250VAC

DONOT OPERATE

47-440Hz

WITHUNGROUNDED

40VAMAX

POWERCORD.

OUTPUT1 OUTPUT2 INPUT1

DIGITAL

SEEMANUAL FOR VOLTAGERANGES ON BNC CONNECTORS

VGA

Ext Analog Output

INPUT2

12-24VDC

ANALOG

(1.3A)

SCSI-2

CAUTION

FORCONTINUED FIRE

PROTECTIONREPLACE

ONLYWITHSPECIFIED

TYPEAND RATEDFUSE.

CAUTION

DONOT OPERATE WITHPOWERCORD

UNGROUNDED

ExtI/O

47-440Hz 85-264VAC

REPLACEFUSE ONLYWITH

SAMETYPE ANDRATING

LPTLine Printer

Ext

Trigger

Port2

Port1

Noise

Noise +28V

Port2

Bias

BiasFuse

Ext

Port1

BiasFuse

Ext10 MHz

ExtAnalog

Source

Figure 6-1. ML2430A Series Power Meter GPIB connection to the MS462XX Vector Network Measurement System

Test Procedure

Step 1. Disconnect cables between MS462XC Port 1 and Port 1of

MS4782 Test Set and between Port 3 of MS462XC and Port 3 of MS4782 Test Set.

Step 2. Press Utility key and select:

DIAGNOSTICS TROUBLESHOOTING MORE VERIFY ALC CALIBRATON

Step 3. Calibrate and zero the power sensor.

6-2 ME 7840A OMM

PERFORMANCE VERIFICATION RETURN LOSS CONFIDENCE TEST

Step 4. Connect power sensor to MS462XC Port 1 and select START

VERIFICATION softkey.

NOTE

The worst case test result will be displayed on the screen when the instru ment fails this test only. Thefailedtestresultisalso recorded in theService Log.

Step 5. Verify that Source 1 passes this test. Step 6. Press the SELECT SOURCE soft key to select 2

Step 7. Connect power sensor to MS462XC Port 3 and select START

VERIFICATION soft key.

CAUTION

The TROUBLESHOOTING function must be properly exited to restore normal

Step 8. Verify that Source 2 passes this test. Step 9. Select the menu soft key as follows to exit the TROUBLE-

SHOOTING mode:

RETURN RETURN FINISHED, RECOVER FROM TROUBLESHOOTINGT

Step 10. Reconnect cables between MS462XC Port 1 and Port 1of

MS4782 Test Set and between Port 3 of MS462XC and Port 3 of MS4782 Test Set.

6-5 RETURN LOSS

CONFIDENCE TEST

Setup Turn on the MS462XC VNMS and MS4782X Test Set and allow them to

This test verifies the accuracy of return loss measurements.

warm up for 30 minutes.

Step 1. Press Default key then 0 key. Step 2. Press Seq key and .select:

TTL I/O. PARALLEL OUT SETUP SET PARALLEL OUT PORT (0-255)

Step 3. Change the value from 0 to 8. Step 4. Select:

ME7840A OMM 6-3

RETURN LOSS CONFIDENCE TEST PERFORMANCE VERIFICATION

RETURN RETURN

Step 5. Press Display key and select:

DISPLAY MODE SINGLE CHANNEL RETURN

Step 6. Press Ch 4 key and then Display key. Step 7. Select:

GRAPH TYPE LOG MAGNITUDE

Step 8. Press Ch 1 key and select LOG MAGNITUDE.

Test Procedure: Insert the Calibration Component Coefficients disk into the MS462XC

floppy disk drive. Step 1. Press Cal key and select:

COMPONENT UTILTIES INSTALL KIT INFO FROM FLOPPY DISK RETURN

Step 2. Follow the prompts and select:

PERFORM CAL: 2 PORT CAL METHOD: STANDARD LINE TYPE: COAXIAL SELECT CALIBRATION TYPE: REFLECTION ONLY–

PORT 1 ONLY FREQUENCY RANGE OF CALIBRATION: 800 MHz TO

2400 MHz SELECT CALIBRATION DATAPOINTS: NORMAL DATA POINTS: 401 POINTS PORT 1 CONNECTOR TYPE: N (F) LOAD TYPE: BROADBAND LOAD

Step 3. Select START CAL soft key to begin calibration. Step 4. Install calibration device per instruction on the display. Select

the appropriate soft key to measure the calibration device.

Step 5. When the “CALIBRATION SEQUENCE COMPLETED” mes

sage is displayed, press the Enter key to continue.

6-4 ME 7840A OMM

Anritsu ME7840A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

Chapter 1 General Information

Chapter 2 Installation

Chapter 3 Operations, General

Chapter 4 Operations, Calibration

Chapter 5 Operations, Measurement

Chapter 6 Performance Verification Procedure