Agilent Technologies 1159A Manuale utente

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User’s Guide

Publication number 01159-92001

August 2002

For Safety, Regulatory, and publis ing information, see t e pages at t e back of t is book.

©Copyrig t Agilent Tec nologies 2002

All Rig ts Reserved.

1159A 1GHz Active Differential Probe

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Contents

Inspect t e Probe 3

1159A Active Differential Probes Introduction 4

Probe Accessories Supplied 5

Attac ing External Attenuators to t e Probe 7

Specifications and C aracteristics 8

To Connect t e Probe to t e Circuit under Test 12

Recommended Probe Configurations 14

Safety Considerations 17

Service Strategy 18

Calibration Testing Procedures 19

Adjustment of 10:1 and 20:1 Attenuators 32

Calibration Test Record 36

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1159A 1GHz Active Differential Probe

Inspect the Probe

❏Inspect the shippin container for dama e.

Keep a damaged s ipping container or cus ioning material until t e contents of

t e s ipment ave been c ecked for completeness and t e probe as been

c ecked mec anically and electrically.

❏Check the accessories.

Any accessories t at were supplied wit t e probe are listed in “Probe

Accessories Supplied” on page 5.

• If t e contents are incomplete or damaged notify your Agilent Sales Office.

❏Inspect the instrument.

• If t ere is mec anical damage or defect, or if t e probe does not operate

properly or pass calibration, notify your Agilent Sales Office.

• If t e s ipping container is damaged, or t e cus ioning materials s ow signs

of stress, notify t e carrier as well as your Agilent Sales Office. Keep t e

s ipping materials for t e carrier’s inspection. T e Agilent office will arrange

for repair or replacement at Agilent’s option wit out waiting for claim

settlement.

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1159A 1GHz Active Differential Probe

1159A Active Differential Probes Introduction

T e 1159A is a wide-band differential active probe. T e probe features low noise,

low input capacitance, ig common mode rejection, and Field Effect Transistor

(FET) buffered inputs in t e probe ead. User-selectable offset gives t e probe

flexibility to measure a large range of signal types. Plug-on attenuators and AC

coupling accessories furt er extend t e application range. Included interconnect

accessories allow connection to surface mount and t roug - ole components

wit minimal signal degradation. T e input receptacles in t e probe ead are

compatible wit standard 0.025" (0.635 mm) square pins, w ic provide a

convenient low-cost met od of creating device c aracterization test fixtures.

T e 1159A is ideal for acquiring ig speed differential signals suc as t ose

found in disk drive read c annels, differential LAN, video, and so on. T e ig

impedance c aracteristics of bot inputs allow you to use t e probe as a FET

probe to make single-ended measurements in digital systems wit out

introducing a ground loop as a conventional FET probe would.

Differential Amplifiers and CMRR

T e 1159A Differential Probe is a ig input impedance amplifier. A

c aracteristic of differential amplifiers is t e ability to reject signals t at are

common to t e two inputs. T e common mode rejection ratio (CMRR) is t e

measurement of t is ability. It is expressed as t e ratio between t e amplitudes

of t e common mode and differential signals t at produce equal outputs. If t e

differential gain is known, t ese measurements can be referred to t e probe

input. CMRR is usually expressed in dB:

T e ability to reject common mode signals depends on t e balance designed into

t e probe amplifier. As t e frequency of t e common mode signal increases, it

becomes arder to balance t e amplifier parasitic parameters. T is leads to

degradation of t e CMRR.

T e CMRR of t e 1159A Differential probe is specified from t e probe tip. T is

met od of specifying t e probe CMMR eliminates t e effects of source

impedance, provided t e connections from t e probe tip to t e signal source are

symmetrical.

CMRR in dB 20 V common mode input Gain×

V common mode output

-------------------------------------------------------------------------





log=

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1159A 1GHz Active Differential Probe

Probe Accessories Supplied

T e following diagram and table s ow t e accessories supplied wit t e 1159A

Differential Probe.

Probe Accessories

Item Description Qty. Part Number

1 AC coupler 1 01154-82101

2 10:1 Attenuator 1 01159-82104

3 20:1 Attenuator 1 01159-82105

4 Header 1 N/A

5OffsetPin 4 N/A

6 0.5 Grabber 2 N/A

7 0.8 Grabber 3 N/A

8 Ground Wire 1 N/A

9 SMT Lead 4 N/A

10 Wire Lead 1 N/A

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1159A 1GHz Active Differential Probe

Probe Accessories Supplied

To Order Replaceable Parts

To order a replaceable part, in t e United States and Canada call our toll-free

otline at 1-877-447-7278, or call your local Agilent Tec nologies Sales Office.

Replaceable Parts

Using the Accessories

T e 1159A Differential Probe and accessories provide a variety of ways to

connect to circuitry under test. Any met od used to connect t e probe signal

inputs to t e circuit under test degrades t e performance of t e probing solution.

Take t e following precautions to optimize common mode rejection.

• Maintain tip connection lead len th as short as possible and the same

len th.

• Follow the same path for wires used to connect the inputs of the probe

to the circuit under test.

• Probes do not have infinite input impedance and do load the circuit

under test. If the impedance of the test points is not identical, unequal

loadin will occur. This de rades common mode rejection.

• The round lead len th is not usually critical with a differential probe.

• Carefully consider the round potential relative to the oscilloscope

round potential. The potential difference must be within the common

mode ran e of the probe.

• The DC potential between the AC couplin adapter and the oscilloscope

ground must not exceed 42 Vpk.

• Do not cascade the external attenuators.

• Cascade the external AC couplin adapter in the followin order: probe,

attenuator, and AC coupling adapter.

Item Description Qty. Part Number

1 AC coupler 1 01154-82101

2 10:1 Attenuator

(includes an adjustment tool) 1 01159-82104

3 20:1 Attenuator

(includes an adjustment tool) 1 01159-82105

Connection Kit 1 01154-60004

4 Header 1 N/A

5OffsetPin 4N/A

6 0.5 Grabber 2 N/A

7 0.8 Grabber 3 N/A

8 Ground Wire 1 N/A

9 SMT Lead 4 N/A

10 Wire Lead 1 N/A

Trimmer Tool

(0.635 mm square head) 1 5063-2196

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1159A 1GHz Active Differential Probe

Attaching External Attenuators to the Probe

Other Probe Accessories

T e Agilent Wedge was designed to interface directly wit t e differential probe.

T ese devices simplify connections to surface mount integrated circuits and ave

output pins compatible wit t e probe tip and attenuator sockets.

Attachin External Attenuators to the Probe

T e external attenuators plug directly on to t e probe tip. T ey are calibrated

at t e factory to provide t e optimum common mode rejection and s ould not

be swapped between probes.

The 1159A probe’s best performance is achieved when the probe attenuation is set

to /10 in the Infiniium’s Probes Setup dialog box.

1159A Attenuator

Div-By-10 1 GHz

Div-By-20 1 GHz

1159A AC Coupler

Always Install Last

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1159A 1GHz Active Differential Probe

Specifications and Characteristics

Specifications

Range

Input Configuration Ground Connector

True Differential (+ and inputs), with shield

Input Coupling DC AC coupling obtained by installing an AC coupling

adapter

Gain Accuracy at 1 kHz 2%

Maximum Input Voltage

Either input from ground

< ±42 V

CMRR at 70 Hz: 80dB

at 1 MHz: 40dB

at 100 MHz: 25dB

at 500 MHz: 19dB

at 1 GHz: 13dB

Mode No attenuator ÷10 attenuator ÷20 attenuator

Differential < ±400 mV < ±4 V < ± 8V

Common < ±16 V < ±42 V < ±42 V

Offset (Common) < ±1.6 V < ±16 V < ±32 V

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1159A 1GHz Active Differential Probe

Specifications and Characteristics

T e following c aracteristics are valid for t e 1159A probe after t e probe as

reac ed operating temperature, w ic is 20 minutes wit power applied in a

environment wit stable ambient temperature. T e probe must be operating

wit in t e environmental conditions listed in t e “Environmental Specifications”

section on page 11, and must ave been calibrated wit in t e past 12 mont s in

a ambient temperature of 23 5 C.

Characteristics

Probe Bandwidth (-3 dB) DC to 1 GHz

Offset Range 1.6 V

Rise Time (Probe only)

1:1 Attenuation

Internal switched attenuation only

<350 ps

Input Resistance

(each side to ground)

1 M

Input Capacitance (between inputs)

1:1 Attenuation

No external attenuators

<0.85 pF

Input Capacitance (each side to ground)

1:1 Attenuation

No external attenuators

<1.5 pF

±°

Ω

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