Agilent Technologies 54701A Manual

User and Service Guide

Publication number 54701-97003

September 2002

For Safety and Regulatory information see the pages behind the index.

Agilent Technologies 54701A

2.5-GHz Active robe

Agilent Technologies 54701A 2.5-GHz Active

robe

The Agilent Technologies 54701A 2.5-GHz Active Probe is a probe solution for

high-frequency applications.This probe is designed to be powered from a

connector at the front of the oscilloscope or with the 1143A Probe Offset

Control and Power Module. It can be used with any measuring instrument

with a 50-Ω input. Following are the main features. See Chapter 3 for full

specifications and characteristics.

• A bandwidth of 2.5 GHz

• Input resistance of 100 kΩ

• Input capacitance of approximately 0.6 pF

• Dynamic range of ±5 V peak ac and ±50 Vdc

• Variable dc offset of ±50 V

• Excellent immunity to ESD and over-voltages

Accessories Supplied

The following accessories are supplied. See “Using probe accessories” in

chapter 1 for a complete list.

• Type N(f) to BNC(m) adapter

• “Walking-stick” ground

• Box of small accessories

• Carrying case

• User and Service Guide

Accessories Available

The following accessories can be ordered.

• Type N(m) to probe tip adapter and 50-Ω termination 11880A

• BNC(m) to probe tip adapter 10218A

• Type N(f) to APC 3.5(f) bulkhead adapter 5081-7722 (For use with the

54120 family. Order with the probe as Option 001.)

Options Available

The following options are available.

• Option 001 Type N(f) to APC 3.5(f) bulkhead adapter (To use the probe

with 54120 family)

• Option 0B1 Additional User and Service Guide

Service Strategy

Except for the probe tip there are no field replacable parts in the Active

Probe. Depending on the warranty status of your probe if it fails it will be

replaced or exchanged. See chapter 3 “Service ” for further information and

how to return your probe to Agilent Technologies for service.

Option 001

In This Book

This book provides use and service documentation for the 54701A 2.5-GHz

Active Probe. It is divided into three chapters.

Chapter 1 shows you how to set up and operate the probe using the power

connector on the oscilloscope or the separately available 1143A Probe Offset

Control and Power Module.

Chapter 2 gives you information about some important aspects of probing and

how to get the best results with your probe.

Chapter 3 provides service information. Included is how to test the probes

performance how and when to make the one adjustment and how to

determine if your probe needs repair.

Contents

In This Book 4

1 Operating the Probe

To inspect the probe 9

To connect the probe 12

Connecting the probe to the 54120 family oscilloscopes 13

Using the probe with oscilloscope power 14

Using the probe with the 1143A power module 15

Using probe accessories 16

Additional Accessories 20

2 Probing Considerations

Capacitive Loading Effects 25

Ground Inductance Effects 27

Probe Bandwidth 31

Conclusion 32

Contents

3Service

Specifications 35

Characteristics 36

General Characteristics 37

Recommended Test Equipment 38

Service Strategy 39

To clean the instrument 40

To return the probe to for service 40

To test input resistance 42

To test dc gain accuracy 43

To test bandwidth 45

To adjust offset zero 49

Failure Symptoms 51

To prepare the probe for exchange 53

Replaceable Parts 54

Theory of Operation 56

Operating the robe

Chapter 1: Operating the Probe

Figure 1

54710A Active Probe

11880A Type-N(m) to

Probe Adapter

(not supplied order

separately)

5081-7722A Type-N(m)

to APC 3.5(f) Adapter

(supplied as Option 001

or order separately)

Walking-stick Ground

(supplied)

N(f) to BNC(m) Adapter

(supplied)

Included with the probe is a

box of small accessories. See

Page 16 for a complete list of

accessories.

Chapter 1: Operating the Probe

Introduction

This chapter shows you how to connect and operate the 54701A Active Probe.

The following information is covered in this chapter:

• Inspection

• Probe operating range

• Connecting the probe

• Operating the probe with oscilloscope power

• Operating the probe with a power module

• Using accessories

To inspect the probe

❏Inspect the shipping container for damage.

Keep a damaged shipping container or cushioning material until the

contents of the shipment have been checked for completeness and the

instrument has been checked mechanically and electrically.

❏Check the accessories.

Accessories supplied with the instrument are listed in "Accessories

Supplied" in table 1 page 16 in this manual.

• If the contents are incomplete or damaged notify your Agilent

Technologies sales office.

❏Inspect the instrument.

• If there is mechanical damage or defect or if the instrument does not

operate properly or pass calibration tests notify your Agilent

Technologies sales office.

• If the shipping container is damaged or the cushioning materials show

signs of stress notify the carrier as well as your Agilent Technologies

sales office. Keep the shipping materials for the carrier's inspection.

The Agilent office will arrange for repair or replacement at Agilent

Technologies’ option without waiting for claim settlement.

Chapter 1: Operating the Probe

Probe Operating Range

robe Operating Range

Figure 2 shows the maximum input voltage for the active probe as a function

of frequency. This is the maximum input voltage that can be applied without

risking damage to the probe.

Figure 2

Maximum Input Voltage vs Frequency

Figure 3 shows the operating range of the probe. For the most accurate

measurements and safety for the probe signals should be within the indicated

operating region.

Figure 3

Probe Operating Range

Area of Optimum

Operating

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