HP 4155A, 4156A Quick Start Manual

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Parameter Analyzer

Quick Start Guide

c



Copyright Hewlett-Packard

Company 1993

All Right Reserved.

Reproduction, adaptation, or

translation without prior written

permission is prohibited, except as

allowed under the copyright laws.

HP Part Number

04155-90200

First edition, September 1993

Printed in Japan

Product Warranty

This Hewlett-Packard product is warranted against

defects in material and workmanship for a period of

one year from date of shipment. During the warranty

period, Hewlett-Packard will, at its option, either repair

or replace products which prove to be defective.

Warranty service of this product will be performed at

Buyer's facility at no charge within Hewlett-Packard

service travel areas. Outside Hewlett-Packard service

travel areas, warranty service will be performed at

Buyer's facility only upon Hewlett-Packard's prior

agreement and Buyer shall pay Hewlett-Packard's

round trip travel expenses. In all other cases, products

must be returned to a service facility designated b

y

Hewlett-Packard.

For products returned to Hewlett-Packard for warranty

service, Buyer shall prepay shipping charges to

Hewlett-Packard and Hewlett-Packard shall pay

shipping charges to return the product to Buyer.

However, Buyer shall pay all shipping charges, duties,

and taxes for products returned to Hewlett-Packard

from another country.

Hewlett-Packard warrants that its software and

rmware designated by Hewlett-Packard for use with

an instrument will execute its programming

instructions when properly installed on that instrument.

Hewlett-Packard does not warrant that the operation

of the instrument, or software, or rmware will be

uninterrupted or error free.

Limitation of Warranty

The foregoing warranty shall not apply to defects

resulting from improper or inadequate maintenance by

Buyer, Buyer-supplied software or interfacing,

unauthorized modications or misuse, operation outside

of the environment specications for the products, or

improper site preparation or maintenance.

No other warranty is expressed or implied.

Hewlett-Packard specically disclaims the implied

warranties of merchantability and tness for a

particular purpose.

Exclusive Remedies

The remedies provided herein are the Buyer's sole and

exclusive remedies. Hewlett-Packard shall not be liable

for any direct, indirect, special, incidental, or

consequential damages, whether based on contract,

tort, or any other legal theory.

Assistance

Product maintenance agreements and other customer

assistance agreements are available for

Hewlett-Packard products.

For any assistance, contact your nearest

Hewlett-Packard Sales Oce.

Certication

Hewlett-Packard Company certies that this product

met its published specications at the time of shipment

[from the factory]. Hewlett-Packard further certies

that its calibration measurements are traceable to the

National Institute of Standards and Technology

(

NIST

), to the extent allowed by the Institute's

calibration facility, and to the calibration facilities of

other International Standards Organization members.

Yokogawa-Hewlett-Packard, Ltd.

9-1, Takakura-cho, Hachioji-shi, Tokyo 192 Japan

HP 4155A and HP 4156A

HP 4155A Semiconductor Parameter Analyzer and HP 4156A Precision

Semiconductor Parameter Analyzer are full automatic and high performance

instruments designed to measure, to display graphically, and to analyze the

dc parameters and characteristics of semiconductor devices such as diodes,

transistors, ICs, solar cells, and wafers during the fabrication process. So you

can evaluate device design, process design, fabrication environments, and so

on with the HP 4155A/4156A.

In semiconductor research and development laboratories

4155A/4156A provides precise characteristics evaluation, which is an

important step in the development of new high performance devices

and gives design engineers an easy to use method of device parameter

acquisition|an essential element in computer aided design (CAD).

On the production line, the HP 4155A/4156A provides real-time feedback

on wafer evaluation to improve the semiconductor process and to increase

production yields.

For semiconductor end users, the HP 4155A/4156A is ideal for circuit design

applications and incoming inspection.

, the HP

,

3

HP 4155A/4156A|At a Glance

Secondary softkeys

Primary softkeys

LINE switch

Flexible disk drive

Keyboard interface

Rotary

knob

LINE switch You use the LINE switch to apply electric power

Flexible disk drive You can use 3.5-inch diskette as the mass storage

which is inserted in this exible disk drive.

Keyboard interface You can control the HP 4155A/4156A from keyboard,

which is connected to the keyboard interface, as well

as from the front-panel keys.

Primary softkeys You use primary softkeys to move pages and to change

the secondary softkey menu.

Secondary softkeys You use secondary softkeys to select variable names,

alternatives, and changing items.

Rotary knob You use rotary knob to change the setting value and to

move a marker.

4

.

,

SMU terminals

Intlk interface

SMU terminals

HP 4155A

Intlk interface

SMU terminals Either voltage or current output is forced from the

Intlk interface To prevent you from electric shock, the HP

HP 4156A

SMU terminals, and measurement signal is put to the

SMU terminals.

4155A/4156A has interlock function. The signals for

the interlock function go through the Intlk interface.

5

In This Guide Book

This guide book is a quick start guide for HP 4155A and HP 4156A. It

introduces a basic measurement and its analysis without a lot of explanation

and details.You can perform the following measurement and analysis through

this guide book:



Measuring Vg{pId



Analyzing its graph and nding threshold voltage (Vth).

characteristics of a MOS FET.

You will nd quick instructions for starting measurements with an HP

4155A/4156A.

Key Conventions.

The following key conventions are used in this guide:

4

Front-panel key

5

Text shown like this represents a key physically located

on the HP 4155A/4156A.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

Softkey

Screen Text

Text shown like this represents a softkey.

Text printed in this typeface indicates text displayed on

the HP 4155A/4156A.

Bold

Text shown like this indicates a term dened in the

glossary.

Italic

Text shown like this referees to a related document, or is

used for emphasis.

Finding Further Information.

This guide book is written for beginners of HP 4155A/4156A. See the

following books for further information on the HP 4155A/4156A:

HP 4155A/4156A User's Guide

(HP part number 04155-90000)

provides information on how to use the HP 4155A/4156A.

HP 4155A/4156A Programmer's Guide

(HP part number 04155-90100)

provides information on how to control the HP 4155A/4156A with remote

commands.

HP Instrument BASIC Users Handbook

(HP part number E2083-90000)

provides information on how to use HP Instrument BASIC, which is

programming language built-in the HP 4155A/4156A.

6

Getting Started

Getting Started

This guide introduces how to use HP 4155A Semiconductor Parameter

Analyzer and HP 4156A Precision Semiconductor Parameter Analyzer. Basic

operations of the HP 4155A/4156A are provided.

This guide consists of the following three sections:



Making a measurement

sample device (MOS FET).



Analyzing a result

threshold voltage (Vth) of the MOS FET.



If you have a problem

encounter while using this guide.

Before going to the next page, make sure you have prepared the following:



HP 4155A or HP 4156A



HP 16442A test xture



Test device (n-channel MOS FET, enhancement type)

In this guide, the test device used is a Siliconix SD214DE.

: preparing for measurements and measuring a

: analyzing the results graphically and searching for the

: providing solutions to problems you may

This guide book assumes that you have already installed

your HP 4155A/4156A. If not, refer to \Installation" in the

HP 4155A/4156A User's Task Guide.

2

.

Making a Measurement

In this section, you learn how to execute the measurements with an

HP 4155A/4156A and to display the measurement results graphically.

Id-Vg measurement of a MOS FET is provided as an example.You learn

step-by-step how to perform this measurement.

You measure the device under test (DUT) by using the measurement circuit as

shown in the following diagram. SMU2 and SMU3 sweep the same voltage to

the gate and drain. SMU3 measures the drain current (Id). The source and

substrate are connected to circuit common.

You should get result similar to the following gure

from 0 V to 2 V) is assigned to X axis

p

@

Id

@V g

is assigned to Y2 axis.

p

,

Id

is assigned to Y1 axis, and

. Gate voltageVg(swept

3

Getting Started

Making a Measurement

Step 1. Prepare for the measurement

Before executing measurement, congure HP 4155A/4156A and accessories.

1. Make sure that the HP 4155A/4156A is o.

2. Connect the HP 16442A test xture to HP 4155A/4156A. See next gure.

3. If you use the keyboard, connect it to the HP 4155A/4156A.

When you use the HP 4155A, connect as follows:

HP 4155A cable HP 16442A

Triaxial

Triaxial

Triaxial

Triaxial

1

)

2

)

2

)

2

)

2

)

Intlk

SMU 1 (blue label)

SMU 2 (blue label)

SMU 3 (blue label)

SMU 4 (blue label)

Intlk

SMU 1

SMU 2

SMU 3

SMU 4

1

Interlock/LED cable: HP 16493J

2

Triaxial cable: HP 16493C.You do not need to connect SMU4 for this measurement.

3

Coaxial cable: HP 16493B.You do not need to connect VSUs and VMUs for this measurement.

(

Interlock/LED

(

(

(

(

Triaxial cable

HP 4155A cable HP 16442A

VSU 1

VSU 2

VMU 1

VMU 2

HP 16442A

(

(

(

(

Coaxial

Coaxial

Coaxial

Coaxial

3

)

3

)

3

)

3

)

VSU 1

VSU 2

VMU 1

VMU 2

Coaxial cable

Interlock/LED

cable

HP 4155A

Connecting HP 4155A to HP 16442A Test Fixture

4

When you use the HP 4156A, connect as follows:

Getting Started

Making a Measurement

HP 4156A cable HP 16442A

Intlk

SMU 1

SMU 2

SMU 3

1

Interlock/LED cable: HP 16493J

2

Kelvin triaxial cable: HP part number 04155-61602

3

Coaxial cable: HP 16493B.You do not need to connect VSUs and VMUs for this measurement.

Kelvin triaxial cable

(

Interlock/LED1)

(

Kelvin triaxial2)

(

Kelvin triaxial2)

(

Kelvin triaxial2)

Intlk

SMU 1

SMU 2

SMU 3

HP 4156A cable HP 16442A

VSU 1

VSU 2

VMU 1

VMU 2

(

Coaxial3)

(

Coaxial3)

(

Coaxial3)

(

Coaxial3)

VSU 1

VSU 2

VMU 1

VMU 2

HP 16442A

Coaxial cable

Interlock/LED

cable

HP 4156A

Connecting HP 4156A to HP 16442A Test Fixture

5

Getting Started

Making a Measurement

Step 2. Mount your DUT on the test xture

1. Select a suitable socket module for your DUT.

2. Mount the socket module on the test xture.

Socket module

HP 16442A Test Fixture

3. Mount your DUT on the socket module.

4. Make connections with four connection cables (miniature banana { pin

plug).

You make the following connections:

Source|SMU1

Gate|SMU2

Drain|SMU3

Substrate|SMU1

Both the source and substrate terminals are connected to SMU1.

5. After nishing connections, shut the lid of the test xture.

6

Connection cables

Getting Started

Making a Measurement

DUT

Gate

Drain

Source

Substrate

Wiring for HP 4155A

For this measurement by the HP 4156A, non-Kelvin connections are used. So,

connect only the force terminals as shown in the following gure:

Connection cables

DUT

Gate

Drain

Source

Substrate

Wiring for HP 4156A

7

Getting Started

Making a Measurement

Step 3. Dene the channel assignments

You set the connection information on the CHANNELS: CHANNEL

DEFINITION page.

1. Switch on the HP 4155A/4156A. Self-test starts.

2. After self-test is nished, make sure that CHANNELS: CHANNEL

DEFINITION page appears on the screen of the HP 4155A/4156A. If not,

press

4

5

front-panel key.

Chan

CHANNELS: CHANNEL DEFINITION page

MEASUREMENT MODE

Secondary

softkeys

Primary softkeys

3. Make sure that

not, select

4. Set the connection information in the CHANNELS table as follows:

8

SWEEP

NNNNNNNNNNNNNNNNN

SWEEP

is displayed in the MEASUREMENT MODE eld. If

secondary softkey in the MEASUREMENT MODE eld.

Getting Started

Making a Measurement

Action on Front Panel on Keyboard

To move the pointer, use

4

5,4

5,4

5

,or

(

)

4

*

+

area.

To move the cursor to edit in display area,

use

4

(

5or4

5

of Edit area. use

)

To enter \VS" in VNAME eld, pressV4.5",S4+5n, then

To enter \IS" in INAME eld, pressI4*5?,S4+5n, then

To set \V" in the MODE eld, select

To set \

VAR1'

"inFCTN eld, select

To set \

VAR1

"inFCTN eld, select

To disable a unit, select

FFFFFFFFFF

V

secondary softkey. press

FFFFFFFFFFFFFFFF

VAR1'

FFFFFFFFFFFFF

VAR1

FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF

DISABLE UNIT

secondary softkey. press

secondary softkey. press

5

of MARKER/CURSOR

4

5

. typeVS, then press

Enter

4

5

. typeIS, then press

Enter

use

secondary softkey. press

4

5,4

5,4

6

7

4

Backspace

4

5-4

Shift

4

5-4

Shift

4

5-4

Shift

4

5-4

Shift

8

F1

F4

F2

F7

5

,or

5

5

5

5

5

4

5

9

key.

4

Enter

4

Enter

keys.

keys.

keys.

keys.

.

5

.

5

.

9

Getting Started

Making a Measurement

Step 4. Dene the user functions

You dene the user functions on the CHANNELS: USER FUNCTION

DEFINITION page.

1.

Select

DEFINITION page appears.

2. Enter the user function information in the table as follows:

CHANNELS: USER FUNCTION DEFINITION page

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

USER FCTN

primary softkey. The CHANNELS: USER FUNCTION

You enter the following two user functions:

SQID =pId

DSQID =

Where,Idis drain current andVgis gate voltage.

10

@

@

Vg

SQID =

p

@

Id

@

Vg

Getting Started

Making a Measurement

Action on Front Panel on Keyboard

To move the pointer, use

area.

To move the cursor to edit in display area, use

To enter \

To enter \

eld,

To enter \

SQID

" in NAME eld, pressS4+5n,Q425',I4*5?,D4/5;, then

4

Enter

SQRT(ID)

1

"

in DEFINITION

pressS4+5n,Q425',R435j,T4p5%,

(blue key),

DSQID

" in NAME eld, pressD4/5;,S4+5n,Q425',I4*5?,D4/5;,

then

To enter \

DIFF(SQID,VG)

DEFINITION eld,

2

"

in

pressD4/5;,I4*5?,F475f,F475f,45(blue

key),

I

4*5?,D4/5;,45(blue key),

B

4)5], then

To disable a user function, select

4(5,4)5,4*5

4(5or4)5

5

.

A

4

Enter

A

4(5[,45(blue key),

FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF

DISABLE FUNCTION

,or

4+5

of Edit area. use

FFFFFFF

4(5[,

ID

,B4)5], then

5

.

4

5

.

Enter

of MARKER/CURSOR

4

Enter

S

4+5n,Q425',

X

4,5>,

FFFFFFF

VG

secondary softkey. press

45

5

,

use

465,475,485

4

Backspace

type

SQID

type

SQRT(ID)

4

5

Enter

.

type

DSQID

type

DIFF(SQID,VG)

4

5

Enter

4

Shift

, then press

.

, then press

.

5-4

F7

,or

495

.

5

key.

4

Enter

, then press

4

Enter

, then press

5

key.

5

.

5

.

1

Square root operator (p) is dened by \SQRT" built-in function.

2

Partial dierence (

@

) is dened by \DIFF" built-in function.

@

11

Getting Started

Making a Measurement

Step 5. Set up the measurement parameters

You set the output parameters on the MEASURE: SWEEP SETUP page.

1. Press

MEASURE: SWEEP SETUP page

VAR1 information

2. Set the VAR1 information as follows:

4

5

front-panel key. The MEASURE: SWEEP SETUP page appears.

Meas

VAR1'

information

12

Getting Started

Making a Measurement

Drain voltage sweeps from 0 V to 2 V with 10 mV step. The current

compliance is set to 100 mA.

Action on Front Panel on Keyboard

To move the pointer, use

To set \

To set \

To enter \

To enter \

SINGLE

LINEAR

" in SWEEP MODE eld, select

" in LIN/LOG eld, select

2.000 V

10.00 mV

"inSTOP eld, pressQ425', then

" in STEP eld, pressP415$,U405#,E4m5@, then

3. Set the VAR1' information as follows:

To force the same voltage to the drain and gate

OFFSET

= 0. Because VAR1' is dened as follows:

(

VAR

10output)=RAT IO2(

4(5,4)5,4*5

FFFFFFFFFFFFFFFFFF

SINGLE

FFFFFFFFFFFFFFFFFF

LINEAR

secondary softkey. press

secondary softkey. press

,or

4

Enter

4+5

. use

5

. type2, then press

4

Enter

5

. type

, set

465,475,485

4

Shift

4

Shift

10m

RATIO

VAR1output)+OFFSET

,or

5-4F15

5-4F15

, then press

= 1 and

495

keys.

keys.

4

Enter

4

.

5

Enter

.

5

.

To enter \

To enter \

Action on Front Panel on Keyboard

0.000 V

1.000

" in OFFSET eld, pressU405#, then

"inRATIO eld, pressP415$, then

4

Enter

4

Enter

5

. type0, then press

5

. type1, then press

4

Enter

4

Enter

5

.

5

.

13

Getting Started

Making a Measurement

Step 6. Set up the results display

You set the results display information on the DISPLAY: DISPLAY SETUP page.

1. Press

DISPLAY: DISPLAY SETUP page

DISPLAY MODE

2. Make sure

3. Set the X-, Y1-, and Y2-axes information as follows:

4

appears.

NNNNNNNNNNNNNNNNNNNNNNN

select

5

Display

GRAPHICS

GRAPHIC

front-panel key. The DISPLAY: DISPLAY SETUP page

is displayed in the DISPLAY MODE eld. If not,

secondary softkey in the DISPLAY MODE eld.

14

Action on Front Panel on Keyboard

To enter \VG" in NAME eld, select

To set \

LINEAR

" in SCALE eld, select

FFFFFFFFFF

VG

secondary softkey. press

FFFFFFFFFFFFFFFFFF

LINEAR

secondary softkey. press

Getting Started

Making a Measurement

4

5-4F35

5-4F15

keys.

keys.

Shift

4

Shift

To enter \

To enter \

To enter \

To enter \

To enter \

To enter \

0.00000 V

2.00000 V

SQID

0.00000 A

100.000mA

DSQID

" in MIN eld, pressU405#, then

" in MAX eld, pressQ425', then

" in NAME eld, select

" in MIN eld, pressU405#, then

" in MAX eld, pressP415$,U405#,U405#,E4m5@, then

" in NAME eld, select

softkeys.

4

Enter

softkeys.

FFFFFFFFFFFFFFFFFFFFFFFF

MORE 1/2

5

.

FFFFFFFFFFFFFFFFFFFFFFFF

MORE 1/2

4

Enter

4

Enter

, then

4

Enter

, then

5

. type0, then press

5

. type2, then press

FFFFFFFFFFFFF

SQID

secondary

5

. type0, then press

FFFFFFFFFFFFFFFF

DSQID

secondary

press

4

Shift

type

press

4

Shift

4

Shift

5-4F35

100m

4

Shift

5-4

F4

4

Enter

4

Enter

5-4F75

keys.

4

Enter

, then press

5-4

5

F7

5

keys.

5

5

keys, then

5

4

Enter

keys, then

.

.

.

5

.

15

Getting Started

Making a Measurement

Step 7. Execute the measurement



Press

4

5

front-panel key to execute the measurement.

Single

[Single] key

You should get measurement results similar to the following gure

16

.

Analyzing the Results

In the previous section, you measured the drain current (Id) while performing

a synchronous sweep of the gate voltage (Vg) and drain voltage (Vd). And the

measurement results were drawn graphically on the screen.

In this section, you analyze the measurement results on the graph and search

threshold voltage (Vth) of the DUT.

The basic algorithm to search for the threshold voltage is:

1.
Assign gate voltage (Vg) to X-axis

2.

Search for the maximum value of

where the gradient ofpId

3.
Draw a tangent line to the point where the gradient ofpId

,

Id

to Y1-axis, and

p

@

Id

@V g

curve, which is also the point

curve is maximum.

p

@

@V g

p

Id

curve is

to Y2-axis.

maximum.

4. Read the X-coordinate value where the tangent line crosses the X-axis

This value is threshold value (Vth).

Tangent

Vth

.

17

Getting Started

Analyzing the Results

Find the threshold voltage

1.

Make sure that

select the

MARKER/CURSOR primary softkey

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

MARKER/CURSOR

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

MARKER/CURSOR

primary softkey is highlighted. If not,

primary softkey.

18

Getting Started

Analyzing the Results

2. Select

The

measurement curve.

3. Select

axis is highlighted.

NNNNNNNNNNNNNNNNNNNN

MARKER

NNNNNNNNNNNNNNNNNNNN

MARKER

Marker

NNNNNNNNNNNNNN

AXIS

secondary softkey so thatONappears on the softkey.

softkey is highlighted, and the markers appears on the

MARKER

secondary

softkey

primary softkey so thatY2appears on the softkey. The Y2

AXIS primary softkey

19

Getting Started

Analyzing the Results

4. Select

the maximum point on the Y2 curve. Theomarker (on Y1 curve) also

moves to same X-axis point, which is maximum gradient of Y1 curve.

5. Select

axis is highlighted.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

MARKER MIN/MAX

Marker *

Marker o

NNNNNNNNNNNNNN

AXIS

primary softkey so that Y1 appears on the softkey

secondary softkey until the*marker moves to

MARKER

MIN/MAX

secondary

softkey

. The Y1

Y1 axis

AXIS primary softkey

20

Getting Started

Analyzing the Results

6. Select

LINE primary softkey

7. Select

NNNNNNNNNNNNNN

the plotting area.

NNNNNNNNNNNNNN

LINE

NNNNNNNNNNNNNN

LINE

LINE

softkey is highlighted, and a vertical line appears in the center of

primary softkey. The secondary softkey menu changes.

Secondary

softkeys

secondary softkey so thatONappears on the softkey. The

Line

LINE

secondary

softkey

21

Getting Started

Analyzing the Results

8. Select

o

Threshold voltage (Vth)

Read the X-axis intercept value of the tangent line

voltage (Vth). In the example above, Vth is 935 mV.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

TANGENT MODE

marker of the Y1 curve.

Marker o

secondary softkey. The line becomes tangent to the

A tangent

TANGENT

MODE

secondary

softkey

. This is the threshold

22

If You Have a Problem

This section describes how to solve the following unexpected problems:



If HP 4155A/4156A cannot be powered on



If display page does not appear after applying power



If HP 16442A test xture is not stable

23

Getting Started

If You Have a Problem

If HP 4155A/4156A cannot be powered on



Check that the power cable is rmly connected to HP 4155A/4156A and to

power outlet.



Check that the front-panel LINE switch is on.



Check that the voltage selector switch is set properly.

The voltage selector switch is located in the lower-right corner of the rear

panel. The following table shows the line voltage selector setting.

Line Voltage Position

84-124 Vac left

200-248 Vac right



Check that the fuse is good.

The fuse holders located in the lower-right corner of the rear panel.

1. Turn the HP 4155A/4156A o and disconnect the power cable from the

power outlet.

2. Unscrew the fuse holder on the rear panel.

3. Inspect that the correct fuse is installed, and wire inside the fuse is

broken by using a rester.

Line Fuse Type HP Part Number

110/120 Vac Time-delay type 8A, 250 Vac 2110-0383

220/240 Vac Time-delay type 4A, 250 Vac 2110-0014

4. Replace the fuse, if necessary. Then, screw in the fuse holder.

5. Turn the HP 4155A/4156A on.

24

not

Getting Started

If You Have a Problem

If display page does not appear after applying power



If HP 41501 is installed,

rst

turn on the HP 41501,

then

turn on

HP 4155A/4156A.



If the self-test fails, see \If You Have a Problem" in the

User's Task Guide

.

HP 4155A/4156A

If HP 16442A test xture is not stable



Install stabilizers on the HP 16442A.

For this procedure, see \Installation" in the

Guide

.



If you use the HP 16442A test xture with HP 16440A selector or

HP 4155A/4156A User's Task

HP 16441A R-BOX, attach HP 16442A to HP 16440A or HP 16441A by

using plates and screws.

For this procedure, see \Installation" in the

Guide

.

HP 4155A/4156A User's Task

25

Getting Started

If You Have a Problem

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