Keysight N5425B User Guide

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Keysight MX0023A InfiniiMax RC Probe Amplifier and Probe Heads

User’s Guide

Notices

CAUTION

WARNING

No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Keysight Technologies, Inc. as governed by United States and international copyright laws.

Manual Part Number

MX0023-97000

Edition

Third Edition, April 2022

Published by: Keysight Technologies, Inc.

1900 Garden of the Gods Road Colorado Springs, CO 80907 USA

Warranty

The material contained in this document is provided “as is,” and is subject to being changed, without notice, in future editions. Further, to the maximum extent permitted by applicable law, Keysight disclaims all warranties, either express or implied, with regard to this manual and any information contained herein, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Keysight shall not be liable for errors or for incidental or consequential damages in connection with the furnishing, use, or performance of this document or of any information contained herein. Should Keysight and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms, the warranty terms in the separate agreement shall control.

Technology Licenses

The hardware and/or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license.

U.S. Government Rights

The Software is "commercial computer software," as defined by Federal Acquisition Regulation ("FAR") 2.101. Pursuant to FAR

12.212 and 27.405-3 and Department of Defense FAR Supplement ("DFARS")

227.7202, the U.S. government acquires commercial computer software under the same terms by which the software is customarily provided to the public. Accordingly, Keysight provides the Software to U.S. government customers under its standard commercial license, which is embodied in its End User License Agreement (EULA), a copy of which can be found at

http://www.keysight.com/find/sweula. The

license set forth in the EULA represents the exclusive authority by which the U.S. government may use, modify, distribute, or disclose the Software. The EULA and the license set forth therein, does not require or permit, among other things, that Keysight: (1) Furnish technical information related to commercial computer software or commercial computer software documentation that is not customarily provided to the public; or (2) Relinquish to, or otherwise provide, the government rights in excess of these rights customarily provided to the public to use, modify, reproduce, release, perform, display, or disclose commercial computer software or commercial computer software documentation. No additional government requirements beyond those set forth in the EULA shall apply, except to the extent that those terms, rights, or licenses are explicitly required from all providers of commercial computer software pursuant to the FAR and the DFARS and are set forth specifically in writing elsewhere in the EULA. Keysight shall be under no obligation to update, revise or otherwise modify the Software. With respect to any technical data as defined by FAR 2.101, pursuant to FAR

12.211 and 27.404.2 and DFARS 227.7102, the U.S. government acquires no greater than Limited Rights as defined in FAR 27.401 or DFAR 227.7103-5 (c), as applicable in any

technical data. 52.227-14 (June 1987) or DFAR 252.227-7015 (b)(2) (November

1995), as applicable in any technical data.

Safety Notices

A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in damage to the product or loss of important data. Do not proceed beyond a CAU- TION notice until the indicated conditions are fully understood and met.

A WARNING notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in personal injury or death. Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met.

1 MX0023A Probe Amplifier - Overview

2 Available Probe Heads and Accessories - Overview

Introduction 8 MX0023A Key Features 10 Compatibility with Keysight Oscilloscopes 11

Introduction to Supported Probe Heads 14 When to Use Which Probe Head 16 Other Recommended Accessories and Kits 19

N5450B Extreme Temperature Cable Extension Kit 19 N2880A InfiniiMax In-Line Attenuator Kit 19 N2881A InfiniiMax DC Blocking Capacitors 20 MX0102A Soldering Toolkit 20 N2852A AutoProbe II to AutoProbe III Adapter 23 MX0104A Performance Verification and Deskew Fixture Kit 23 N5448B (25cm) / N2823A (1m) Coaxial Phase Matched Cable Pair 24 N2812B (1m) High Performance Input Cable 24 E2669B Differential Connectivity Kit 25

3 Safety and Regulatory Information

Safety Checks and Warnings 28 Instrument Markings and Symbols 30

4 Proper Handling of Probe Amplifier and Probe Heads

Avoiding Damage and Costly Repairs 32

Using a static-safe workstation 32

Probe Amplifier and Probe Heads Handling Precautions 34

Precautions for the Probe Amplifier 34 Precautions for the Probe Cable 34

Precautions while Connecting and Disconnecting Probe Heads 35

Safely Connecting/Disconnecting the Probe Amplifier and Oscilloscope 35 Safely Connecting/Disconnecting the Probe Amplifier and Probe Head 35 Moving the Probing Setup to Different Probing Locations 35

Strain Relieving Techniques for Probe Heads 37

Tack-putty 38 Low-temperature hot glue 38

Velcro Pads 39

Tips for Soldering Probe Heads 40 Cleaning 41

5 Characteristics and Specifications

MX0023A Probe Amplifier Warranted Specifications 44 MX0023A Probe Amplifier Characteristics 45 InfiniiMax RC Probe Heads Characteristics 47 Environmental and General Characteristics 48

6 MX0100A InfiniiMax Micro Probe Head

Overview 50

MX0100A Probe Head Kit Components 51 MX0100A Dimensions 51 MX0100A Input Impedance 53

Setting up and Using the MX0100A Probe Head 56

Trimming the Lead Wires of MX0100A Probe Head 56 Soldering an MX0100A Probe Head to DUT 57

Maintaining the MX0100A Probe Head 60

MX0100A Probe Head Handling Precautions 60 Replacing the MX0100A Probe Tip Lead Wires 63

Extreme Temperature Testing with the MX0100A Probe Head 66

7 MX0106A InfiniiMax Differential Solder-in Probe Head

Overview 68

MX0106A Probe Head Supplied Accessories 68 MX0106A Dimensions 68 MX0106A Input Impedance 70

Setting up and Using the MX0106A Probe Head 73

Adjusting the Spacing between MX0106A Wires 73 Installing / Replacing the MX0106A Probe Head Wire Leads 73 Connecting the MX0106A Probe Head to DUT 77 Soldering the MX0106A Probe Head to DUT 78

Extreme Temperature Testing with the MX0106A Probe Head 79

8 N2839A InfiniiMax II Browser Probe Head

Overview 82

N2839A Browser Probe Head Components 82 N2839A Supplied Accessories 82 N2839A Dimensions 84 N2839A Input Impedance 84

Using the N2839A Browser Probe Head 88

4 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Adjusting Spacing Between the Browser Tips 88 Hands-Free Probing 88

Maintaining the N2839A Probe Head 90

N2839A Probe Head Handling Precautions 90 Location of Serial Number 90 Replacing the Browser’s Tips 91

9 MX0105A InfiniiMax Differential SMA Probe Head

Overview 94

MX0105A Probe Head Components 94 MX0105A Dimensions 96 MX0105A SPICE Subcircuit Data 97 MX0105A Input Return Loss (S11) 98

10 N5425B InfiniiMax Differential ZIF Probe Head

Overview 100

Supported ZIF Tips 100 N5425B Probe Head and ZIF Tips Dimensions 102

N5425B Input Impedance 104

SPICE Model of N5425B Probe Head with N5426A ZIF Tip Attached 105 SPICE Deck of N5425B Probe Head with N5426A ZIF Tip Attached 106 SPICE Model of the N5426A ZIF Tip 108 SPICE Deck of N5426A ZIF Tip 109

Using the N5425B Probe Head with N5426A ZIF Tips 111 Using the N5425B Probe Head with N2884A Fine Wire ZIF Tip 116 Maintaining the N5425B Probe Head 123

Fine Wire ZIF Tips Handling Precautions 123

11 Configuring Infiniium Software for Probe Amplifier and Probe Heads

Selecting Components Used in the Probing Setup 126 Configuring Offset Behavior 129 Calibrating your InfiniiMax RC Probe 131

Calibration Overview 131 Performing DC Gain / Offset and Skew Calibration 132

12 Making Measurements

Probing Single-ended Signals using a Differential Probe Head 138 Extreme Temperature Probing 139

InfiniiMax RC Probe Heads Supporting Extreme Temperature Testing 139 Probe Heads Discoloration 139 Cautions Associated with Extreme Temperature Testing 140

Probing Ungrounded Devices 141

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 5

Blocking out the DC Component of the Input Signal 142

13 InfiniiMax RC Probe Amplifier and Probe Heads System Responses

Typical Corrected System Frequency Response 144 Typical Step Response of Corrected System 145 Typical CMRR 146

14 Performance Verification

Before you Start 150

Recommended Test Interval 150

To Test Bandwidth 151

Required Test Equipment 151 Procedure 152

To Test Input Resistance 157

Required Test Equipment 157 Procedure 157

Performance Test Record 161

15 Returning a Probe/Probe Head for Repair/Service

Contacting Keysight Technologies for Technical Assistance 164

16 Replacement Parts

Index

MX0100A Probe Head 165 MX0106A Probe Head 165 N2839A Browser Head 166 Other Replacement Parts 166

6 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Keysight InfiniiMax RC Probe Amplifier and Probe Heads

User’s Guide

1 MX0023A Probe Amplifier -

Overview

Introduction 8 MX0023A Key Features 10 Compatibility with Keysight Oscilloscopes 11

1 MX0023A Probe Amplifier - Overview

Output Connector (with AutoProbe II Connection to Oscilloscope)

Probe Head Connector

Menu Button

Polarity Markings

Channel Identification Rings

Ground Connection

Introduction

The MX0023A InfiniiMax RC probe amplifier provides high bandwidth of up to 25 GHz and an RC input impedance profile for extremely low mid-band loading, which is necessary to address modern high-speed probing requirements.

This probe amplifier supports a wide variety of flexible connectivity solutions, covering today's emerging signaling standards such as DDR5/LPDDR5 and other high-speed signal debug and validation test needs.

With an extensive range of supported probe heads and accessories, this probe amplifier caters to most of the probing situations including harder to probe small geometry target devices and extreme environment testing.

8 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Figure 1 MX0023A Probe Amplifier

Table 1 MX0023A Probe Amplifier Components

Probe Amplifier Component Description/Usage

Output Connector

(with AutoProbe II Connection to Oscilloscope)

Menu Button Press this button to bring up the Infiniium GUI’s Probe

The probe amplifier uses the Keysight AutoProbe II (3.5 mm) interface that allows it to connect directly to a compatible Keysight oscilloscope (see page 11 ). The oscilloscope’s AutoProbe interface provides the probe power, probe offset, and auto configuration of probe type and attenuation setting on connection.

Configuration dialog box on the oscilloscope. Use this dialog box to configure probe settings (see page 125 ).

MX0023A Probe Amplifier - Overview 1

Table 1 MX0023A Probe Amplifier Components

Probe Amplifier Component Description/Usage

Channel Identification Rings When multiple probes are connected to the oscilloscope, use the

channel identification rings to associate the channel inputs with each probe. Place one colored ring near the probe’s output connector and place an identical color ring near the probe head connector.

Polarity Markings Polarity markings to indicate the positive (+) and negative (-)

inputs of the probe amplifier.

Probe Head Connector Use this connector to connect your probe amplifier to one of the

supported probe heads (see page 14).

Ground Connection Allows you to connect the DUT ground to the probe amplifier

ground using a ground lead wire. This is needed if the DUT is not grounded to the oscilloscope via the AC mains ground (see page 141).

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 9

1 MX0023A Probe Amplifier - Overview

MX0023A Key Features

Yielding Accurate

Measurements

“RC" Input

Impedance

Architecture

Two Input

Attenuation

Ranges

The MX0023A probe amplifier has built-in probe specific s-parameter correction filter to ensure a flat frequency response. This unique s-parameter of the probe amplifier is used with the s-parameters of various supported probe heads to further flatten the magnitude and phase response of the probe for high accuracy measurements. Each probe head has different s-parameters stored in the oscilloscope’s firmware. On selecting the probe head in the oscilloscope’s software, the appropriate s- parameters for the probe head are used in conjunction with the probe amplifier’s s-parameters to compute the overall probe correction for your measurement case.

The probe amplifier’s RC architecture makes it suitable for probing buses that transition to a “high Z” state or for probing signals with high impedance.

The probe amplifier supports the following two flexible input dynamic ranges.

• 600mVpp @1:1

•2.5Vpp @4:1

The input range is automatically configured depending on the vertical scale of the oscilloscope.

AC Calibration

Mode

High Bandwidth

Probing

Requirements

Applicable

System

Bandwidth

10 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

The probe amplifier supports the Vout/Vin calibration to accurately show the voltage at the tip of the probe (Vout/Vin) as loaded by the probe. VIn represents a new signal with the probe’s effect included (the voltage at the probe’s tip), and Vout represents the signal as passed through the probe.

The probe amplifier efficiently fulfills the probing bandwidth requirements between 6-25 GHz. For instance, it is best suited for serial links operating up to 12 Gbps that require the probe bandwidth up to 25 GHz.

For any combination of a probe head with the MX0023A probe amplifier, the applicable system bandwidth is the lesser of the supported bandwidths of the probe head or the probe amplifier. The MX0023A supports 25 GHz bandwidth. Therefore, if, for example, you use it with the MX0106A probe head, which supports a 23 GHz bandwidth, then this combination would produce a system with a 23 GHz bandwidth.

Compatibility with Keysight Oscilloscopes

NOTE

Compatible Oscilloscope Adapter Required

Infiniium Oscilloscopes with AutoProbe II Interface

UXR-Series (13-33 GHz models) none 10.25 or higher

90000 Q, V, X, Z-Series none 6.55 or higher

Infiniium Oscilloscopes with AutoProbe III Interface

MX0023A Probe Amplifier - Overview 1

Required Infiniium Software Version

UXR-Series (40 GHz or higher models)

N2852A AutoProbe II to AutoProbe III Adapter

(Visit

http://www.keysight.com/find /N2852A to know more about this

adapter.)

10.25 or higher

The MX0023A probe amplifier is NOT compatible with Infiniium 9000 Series, InfiniiVision, or any previous generation Keysight oscilloscopes.

Is your oscilloscope software up-to-date?

Keysight periodically releases software updates to support your probe, fix known defects, and incorporate product enhancements. To download the latest firmware, go to www.Keysight.com and search for your oscilloscope’s model number. Click the “Drivers, Firmware & Software” tab under the Technical Support link.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 11

1 MX0023A Probe Amplifier - Overview

12 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Keysight InfiniiMax RC Probe Amplifier and Probe Heads

User’s Guide

2 Available Probe Heads and

Accessories - Overview

Introduction to Supported Probe Heads 14 When to Use Which Probe Head 16 Other Recommended Accessories and Kits 19

This chapter provides an overview of various probe heads and accessories that are compatible for use with the MX0023A probe amplifier.

2 Available Probe Heads and Accessories - Overview

NOTE

Introduction to Supported Probe Heads

A probe amplifier connects to a DUT via a probe head. When using the MX0023A probe amplifier, you can choose from a wide variety of probe heads and accessories to support your specific probing and DUT connectivity requirements.

The probe heads supported for MX0023A are primarily categorized as follows:

Probe Head Where to Find Detailed Information

New InfiniiMax RC Probe Heads

(supporting higher bandwidths up to 25 GHz)

Existing InfiniiMax I and II Probe Heads (supporting bandwidths up to 12 GHz)

Detailed information on each of these probe heads is available as separate chapters in this guide.

Most of the existing InfiniiMax I and II probe heads are compatible for use with the MX0023A probe amplifier (see

Figure 2 on page 15).

Detailed information on each of these probe heads is available in the Keysight 1168/9B-Series Differential and Single-Ended Probes user’s guide. This guide is available for download from the Document Library tab on www.keysight.com/find/1169B.

InfiniiMax III and III+ probe heads are NOT compatible for use with the MX0023A probe amplifier.

The following figure displays these supported probe heads and accessories for MX0023A.

14 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Available Probe Heads and Accessories - Overview 2

Figure 2 MX0023A Probe Family Diagram

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 15

2 Available Probe Heads and Accessories - Overview

When to Use Which Probe Head

The following table provides a high-level comparison of the supported probe heads to help you assess when to use which probe head with MX0023A.

These probe heads are listed in the order of their maximum supported bandwidth when used with the MX0023A probe amplifier.

Table 2 Supported Probe Heads (Sheet 1 of 3)

Probe Head (listed in the order of BW) Recommended Usage Bandwidtha

1. MX0100A InfiniiMax Micro Probe Head (refer to page 49 for details)

• Light, flexible, and smallest solder-in head

25 GHz 0.17 pF 0.26 pF

• Best suited for providing uncompromised

access to small geometry, high-density fine-pitch targets

• Recommended for high-speed signaling

standards DDR4, DDR5, LPDDR4, LPDDR5, MIPI D-Phy 2.0/3.0, C-Phy, and M-Phy

2. MX0106A Differential Solder-in Probe Head (refer to page 67 for details)

• The most reliable semi-permanent signal

access for high fidelity measurement

23 GHz 0.17 pF 0.29 pF

• Hands-free access to fine-pitch

components in high-density electronics

• Recommended for MIPI D-Phy 2.0 and

C-Phy 2.0

3. N2839A InfiniiMax II Browser Probe Head (refer to page 81 for details)

• Hand-held browsing for general purpose

troubleshooting of a circuit board

21 GHz 0.20 pF 0.34 pF

• Adjustable probe tips for different circuit

geometries

Cdiff (pF)

Cse (pF)

4. MX0105A Differential SMA Probe Head (refer to page 93 for details)

• Suitable for differential cabled

measurement using only one channel of the oscilloscope

20 GHz N/A N/A

• Offset matched SMA cables adapt to

variable spacing

• Ideal for signaling standards such as HDMI

and MIPI Mphy that require termination to a common DC voltage (± 4 V) rather than a ground

16 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Table 2 Supported Probe Heads (Sheet 2 of 3)

Available Probe Heads and Accessories - Overview 2

Probe Head (listed in the order of BW) Recommended Usage Bandwidtha

5. N5425B Differential ZIF Probe Head (refer to page 99 for details)

• Ideal for probing multiple signals in tight

spaces such as DDR memory

• ZIFs can be installed at multiple locations

on your DUT

• Ideal for hard to reach, small fine pitch

targets

• ZIF feature allows connection without

compressing the delicate wires which cannot support this compression

With N5426A ZIF Tip

18 GHz 0.33 pF 0.53 pF

N2884A Fine Wire ZIF Tip

18 GHz 0.35 pF N/A

• Recommended for DDR4, DDR5, LPDDR4,

MIPI D-Phy 2.0 and C-Phy 2.0

6. N5381B Differential Solder-in Probe Head (refer to 1168/9B-Series Probes user’s guide)

• Solder-in hands free connection

12 GHz 0.21 pF 0.35 pF

• Recommended for DDR4, DDR5, LPDDR4,

MIPI D-Phy 2.0

Cdiff (pF)

Cse (pF)

7. N5380B Differential SMA Probe Head (refer to 1168/9B-Series Probes user’s guide)

• Suitable for differential cabled

measurement using only one channel of the oscilloscope

12 GHz N/A N/A

• Offset matched SMA cables adapt to

variable spacing

• Ideal for signaling standards such as HDMI

and MIPI Mphy that require termination to a common DC voltage (± 4 V) rather than a ground

Note: The plastic housing on the N5380B needs to be removed to mate with the MX0023A amplifier. Refer to the 1168/9B-Series Probes user's guide for details of this removal procedure.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 17

2 Available Probe Heads and Accessories - Overview

Table 2 Supported Probe Heads (Sheet 3 of 3)

Probe Head (listed in the order of BW) Recommended Usage Bandwidtha

8. N5425B ZIF Probe Head with Long Wire ZIF Tips (refer to 1168/9B-Series Probes user’s guide)

• The long-wired ZIF tips connection is ideal

for variable pitch targets, including larger pitches

• Ideal for probing multiple signals in tight

spaces such as DDR memory

• ZIFs can be installed at multiple locations

on your DUT

With 7mm N5451A ZIF Tip

~9.9 GHz (0º tip span) ~4.4 GHz (60º tip span)

With 11mm N5451A ZIF Tip

• ZIF feature allows connection without

compressing the delicate wires which cannot support this compression

• Recommended for DDR4, DDR5, LPDDR4,

MIPI D-Phy 2.0 and C-Phy 2.0

9. E2677B Differential Solder-in Probe Head (refer to 1168/9B-Series Probes user’s guide)

~5 GHz (0º tip span) ~3.3 GHz (60º tip span)

• Hands-free solder-in connection 12 GHz 0.27 pF 0.44 pF

Cdiff (pF)

0.6 pF 0.58 pF

0.68 pF 0.68 pF

Cse (pF)

10. E2678B Differential Socketed Probe Head (refer to 1168/9B-Series Probes user’s guide)

• Measuring signal via a plug-on socket

connection

12 GHz 0.34 pF 0.56 pF

• Removable connection using solder-in

resistor pins for hard to reach targets

11. E2675B Differential Browser Probe Head (refer to 1168/9B-Series Probes user’s guide)

• Hand-held browsing for general purpose

troubleshooting of a circuit board

a The bandwidth listed in this table is the maximum bandwidth supported by each probe head. For any combination of a probe head with a probe

amplifier, the applicable bandwidth is the lesser of the supported bandwidths of the probe head or the probe amplifier. For example, using the MX0023A, which supports a 25 GHz bandwidth, with a MX0106A, which supports a 23 GHz bandwidth, would produce a system with a 23 GHz bandwidth.

b Capacitance seen by differential signals

c Capacitance seen by single-ended signals

6 GHz 0.32 pF 0.57 pF

18 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Available Probe Heads and Accessories - Overview 2

Attenuator

Other Recommended Accessories and Kits

In addition to the probe heads listed in the previous section, there are a number of kits and accessories available for use with the MX0023A probe amplifier.

This section provides an overview to these recommended accessories and kits. You can either order these at the time of ordering the probe amplifier or separately later.

N5450B Extreme Temperature Cable Extension Kit

The N5450B extreme temperature cable extension kit allows you to use the MX0023A probe amplifier to probe a device in an environment chamber. The MX0023A probe amplifier has an operating temperature range from 5 subjected to extreme temperatures. But a few probe heads can be operated over a much larger range of temperatures. The N5450B extension cables allow you to physically separate the amplifier from the probe head so that the probe head can be operated inside a temperature chamber while the probe amplifier remains outside the chamber.

C to 40o C and cannot be

Refer to the topic “Extreme Temperature Probing" on page 139 to know more.

Table 3 N5450B Kit Contents

Item Qty Supplied Description

Phase-matched RF

Cables

Coupling Tag 1 A coupling tag is included with the cables to ensure

2 To ensure a high-quality measurement, the N5450B

N2880A InfiniiMax In-Line Attenuator Kit

The N2880A In-Line Attenuators allow you to increase the maximum input range and offset range of the MX0023A probe amplifier so that you can measure signals larger than the probe’s maximum input range and offset range.

cable set have been phase-matched at the factory.

that the cables stay as a matched pair.

Figure 3 Attenuators Between a Probe Amplifier and a Probe Head

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 19

2 Available Probe Heads and Accessories - Overview

DC Blocking Capacitor

Table 4 N2880A Kit Contents

Item Qty Supplied Description

6 dB Attenuators 2 These attenuators come as matched pairs and should only be

12 dB Attenuators 2

20 dB Attenuators 2

N2881A InfiniiMax DC Blocking Capacitors

The N2881A InfiniiMax DC Blocking Capacitors block out the DC component of the input signal (up to 30 Vdc). You can place these between the MX0023A probe amplifier and probe head as shown in the picture below.

used with each other. Each attenuator has a serial number. The pair of matching attenuators in each set will have the same four digit numeric prefix and will differ by the last letter (one attenuator in the matched pair will be labeled A and the other will be labeled B).

Figure 4 Placement of DC Blocking Capacitor Between a Probe Amplifier and a Probe Head

You can also use these DC blocking capacitors with the N2880A In-Line Attenuators. The order of the two products in the probing system (that is, which one is closer to the probe amplifier) does not matter.

Refer to the topic “Blocking out the DC Component of the Input Signal" on page 142 to know more.

MX0102A Soldering Toolkit

The MX0102A soldering toolkit provides tools that can make soldering tasks easier. For instance, you can use the tools available in this kit while soldering the lead wires of the MX0100A Micro probe head to a DUT (see page 57 for details).

20 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Available Probe Heads and Accessories - Overview 2

Straight

Tweezers

Cutting

Tweezer s

Double-sided Foam Tape

Low Temperature

Solder Wire

Regular Solder Wire

Probe Tip Wire

Kapton Tape

Figure 5 MX0102A soldering toolkit contents

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 21

2 Available Probe Heads and Accessories - Overview

Table 5 Accessories supplied in the soldering toolkit

Description

Straight Tweezers

(Anti-magnetic straight pointed tip 120mm) For general purpose manipulation / movement of com-

ponents such as probe tip wires and probe head.

Cutting Tweezers

(Narrow oblique head 115mm) To cut a probe tip wire to a desired length.

Kapton Tape (36 yards roll)

To provide strain-relief to the neck portion of the probe head by taping it to a flat surface (such as a DUT circuit board).

Double-sided Foam Tape

To provide strain-relief to either the neck portion of the probe head or the plastic housings by taping it to a flat surface such as a tabletop or a DUT circuit board.

Regular Solder Wire

Lead free, .009" diameter, 2 feet long To attach the probe tip wires to a DUT using standard

lead-free soldering temperatures (330 °C to 350 °C). (NOTE: This alloy melts at 217

C.)

Qty Supplied

Part Number

1 8710-2837

1 8710-2838

1 0460-3121

10 0460-3122

1 MX0102-21302

Low Temperature Solder Wire

1 MX0102-21303 Lead free, .010" diameter, 2 feet long To attach the probe tip wires to a DUT using a low tem-

perature setting on your soldering iron. (NOTE: This alloy melts at 138

Probe Tip Wire

C.)

1 MX0102-21301 .004" diameter, 2 feet long To add ground wires to your probe tip if InfiniiMode mea-

surements (differential, single ended, and common mode signals with a single probe tip) are desired. Clip as short as possible using the cutting tweezers included in the kit.

a You can reorder these items using the part numbers included in the table above.

22 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Available Probe Heads and Accessories - Overview 2

CAUTION

N2852A AutoProbe II to AutoProbe III Adapter

This adapter allows you to connect the MX0023A probe amplifier that has the AutoProbe II interface to the Keysight UXR-Series (40 GHz or higher) Infiniium oscilloscope that has the AutoProbe III interface.

To know more about the N2852A adapter, visit

http://www.keysight.com/find/N2852A and then

download the adapter’s user’s guide available in the Document Library tab.

Care should be taken while handling the N2852A adapter's RF cable. Avoid bending this cable backwards or kinking the cable to ensure measurements accuracy.

MX0104A Performance Verification and Deskew Fixture Kit

The MX0104A PV/Deskew fixture helps you to calibrate / deskew or verify the performance of your MX0023A probe amplifier.

Table 6 MX0104A Kit Contents

Item Qty Supplied

50Ω SMA Terminator 1

Deskew Fixture 1

The MX0104A fixture is used with the following two components to promote the proper positioning of the probe during the deskew/PV procedure.

Table 7 MX0104A Optional Components

Option Usage

N2787A 3D

Probe

Positioner

For more sophisticated probe head positioning Highly recommended for MX0023A probe amplifier.

Also, highly recommended when using probe heads such as the browser probe head to hold the browser in place.

Option 001:

Performance

Verification

Stand

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 23

For convenient, handy, and low-cost probe head positioning

Recommended for use with InfiniiMax III/III+ probe amplifiers and heads only

2 Available Probe Heads and Accessories - Overview

CAUTION

• To know how to use this fixture for deskew/calibration of your probe, refer to

the chapter “Performing DC Gain / Offset and Skew Calibration" on page 132.

• To know how to use this fixture for performance verification of your probe, refer

to the chapter “Performance Verification" on page 149.

N5448B (25cm) / N2823A (1m) Coaxial Phase Matched Cable Pair

The N5448B (25cm) / N2823A (1m) phase matched cable pair allows you to extend the cable length of the MX0105A SMA probe head and add flexibility and convenience to the probing setup. You can easily replace the supplied rigid cables of the SMA probe head with these cables. These cables support 2.92 mm male-to-2.92 mm male connection. Skew error between two cables are matched to within 5 psec, and the cable supports up to 40 GHz. For detailed specifications of these cables, refer to the user’s guide available in the

Document Library tab of www.keysight.com/find/N5448B.

Figure 6 N2823A and N5448B Coaxial Phased Matched Cable Pairs

The maximum bend radius for these coaxial cable pairs is 30 mm. Bending these cables at too tight a radius or twisting the cables can cause damage, reduce performance, and impact the precision of these cables.

N2812B (1m) High Performance Input Cable

The N2812B input cable provides excellent flexibility, high quality measurements, and a warranted bandwidth of 32 GHz. You can use this cable with the Infiniium V, 90000-X/Q, UXR <=33 GHz series oscilloscopes.

24 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

E2669B Differential Connectivity Kit

The E2669B differential connectivity kit provides multiple quantities of the:

• following three InfiniiMax I probe heads supported for use with the MX0023A

probe amplifier.

• accessories needed for these three probe heads.

Available Probe Heads and Accessories - Overview 2

Figure 7 E2669B Differential Connectivity Kit (not to scale)

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 25

2 Available Probe Heads and Accessories - Overview

NOTE

Table 8 E2669B Kit Contents

Probe Heads Included in the Kit

E2678B Differential Socketed Head 2

E2677B Differential Solder-In Head 4

E2675B Differential Browser 1

Qty Supplied

Qty

Other Accessories Included in the Kit

160W damped wire accessory 12

82W resistor for full bandwidth 96

Socket for 25 mil (25/1000 inch) square pins, female on both ends

25 mil female socket w/20 mil round male pin on other end

Heat shrink socket accessory 8

Header adapter, 91W 4

82W resistor template 1

91W resistor for full bandwidth 80

150W resistor for medium bandwidth 40

91W resistor template 1

150W resistor template 1

Resistive tip (blue), 91W 20

Ergonomic handle 1

Supplied

E2678B E2677B E2675B

✓

Used With

✓

Part Number

(Not orderable)

01130-21303

01130-81506

01131-85201

01131-85202

01130-41101

01130-63201

01131-94309

1NC3-1091

1NC3-1150

01131-94311

01131-94308

✓

01131-62107

01131-43201

Resistor performance. The S2 resistors were changed from 100W to 91W for slightly better performance. Either value produces a response that is well within specifications. If you have some of the older 100W resistors, ensure that you use either two 100W or two 91W resistors. Do not mix them.

26 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Keysight InfiniiMax RC Probe Amplifier and Probe Heads

User’s Guide

3 Safety and Regulatory

Information

Safety Checks and Warnings 28 Instrument Markings and Symbols 30

3 Safety and Regulatory Information

WARNING

Safety Checks and Warnings

This manual provides information and warnings essential for operating this probe and probe heads in a safe manner and for maintaining these in safe operating condition. To ensure safe operation and to obtain maximum performance from the probe, carefully read and observe the following warnings, cautions, and notes.

These product have been designed and tested in accordance with accepted industry standards, and have been supplied in a safe condition. The documentation contains information and warnings that must be followed by the user to ensure safe operation and to maintain these products in a safe condition.

Note the external markings on the products that are described in this document.

To avoid personal injury and to prevent fire or damage to these products or products connected to these, review and comply with the following safety precautions.

Use Only Grounded Instruments. Do not connect the probe’s ground lead to a potential other than earth ground. Always make sure the probe and oscilloscope are grounded properly. Before making connections to the input leads of this probe, ensure that the probe’s output connector is attached to the channel input of the oscilloscope and the oscilloscope is properly grounded.

Connect and Disconnect Properly. See page 35 for the sequence in which connection/disconnection needs to be done.

Observe Probe Voltage Ratings. Do not apply any electrical potential to the probe input which exceeds the maximum rating of the probe. See page 45 for maximum input voltage ratings. These probe assemblies are NOT intended for measurements on mains circuits (CAT II, CAT III, and CAT IV).

Indoor Use Only. Do not operate in wet/damp environments. Keep product surfaces dry and clean.

Never leave the probe connected to a conductor while it is not connected to an oscilloscope or voltage measuring instrument.

Periodically inspect the probe and probe wires to check for any damage. Do Not Operate With Visible or Suspected Failures. If you suspect there is damage, have it inspected by a Keysight authorized service personnel.

28 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Safety and Regulatory Information 3

WARNING

CAUTION

WARNING

Do not operate the probe or oscilloscope in the presence of flammable gasses or fumes. Operation of any electrical instrument in such an environment constitutes a definite safety hazard.

If the probe/probe heads are used in a manner not specified by the manufacturer, the protection provided by these may be impaired.

Do not install substitute parts or perform any unauthorized modification to the probe amplifier / probe head. Do not attempt internal service or adjustment. Service should be carried out by a Keysight Technologies authorized service personnel. For any service needs, contact Keysight Technologies. See page 163 to know more.

The probe cable is a sensitive part of the probe and, therefore, you should be careful not to damage it through excessive bending or pulling. Avoid any mechanical shocks to this product in order to guarantee accurate performance and protection.

Concerning the Oscilloscope or Voltage Measuring Instrument to Which the Probe is Connected

Whenever it is likely that the ground protection is impaired, you must make the instrument inoperative and secure it against any unintended operation.

If you energize the instrument by an auto transformer (for voltage reduction or mains isolation), the ground pin of the input connector terminal must be connected to the earth terminal of the power source.

Before turning on the instrument, you must connect the protective earth terminal of the instrument to the protective conductor of the (mains) power cord. The mains plug shall only be inserted in a socket outlet provided with a protective earth contact. You must not negate the protective action by using an extension cord (power cable) without a protective conductor (grounding). Grounding one conductor of a two-conductor outlet is not sufficient protection.

Capacitors inside the instrument may retain a charge even if the instrument is disconnected from its source of supply.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 29

3 Safety and Regulatory Information

Instrument Markings and Symbols

Symbol Description

This symbol indicates the Environmental Protection Use Period (EPUP) for the product’s toxic substances for the China RoHS requirements.

Notice for the European Community: This product complies with the WEEE Directive (2002/96/EC) marking requirements. The affixed label indicates that you must not discard this electrical/electronic product in domestic household waste.

Product Category: With reference to the requirement types in the WEEE Directive Annex I, this product is classed as a “Monitoring and Control Instrumentation” product. Do not dispose in domestic household waste.

To return unwanted products, contact your local Keysight office.

This symbol indicates that it is necessary for you to follow the instructions in the user’s guide to protect against damage to the product or personal injury.

Contains parts or assemblies susceptible to damage by electrostatic discharge (ESD). Use electrostatic discharge protective handling procedures. See page 32 to know more.

Earth (ground) TERMINAL. Refer to the instructions accompanying this symbol in this guide.

30 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Keysight InfiniiMax RC Probe Amplifier and Probe Heads

User’s Guide

4 Proper Handling of Probe

Amplifier and Probe Heads

Avoiding Damage and Costly Repairs 32 Using a static-safe workstation 32 Probe Amplifier and Probe Heads Handling Precautions 34 Precautions while Connecting and Disconnecting Probe Heads 35 Strain Relieving Techniques for Probe Heads 37 Tips for Soldering Probe Heads 40 Cleaning 41

This chapter provides cautions, warnings, and tips to properly handle your probe/ probe heads to prevent damage and maintain accurate and high performance.

4 Proper Handling of Probe Amplifier and Probe Heads

Types of ESD protection used

- Conductive table-mat and wrist-strap combination

- Conductive floor-mat and heel-strap combination

Avoiding Damage and Costly Repairs

Using a static-safe workstation

InfiniiMax RC probes and accessories are ESD sensitive devices. Before using or handling any of these, always wear a grounded ESD wrist strap and ensure that cables and probe heads are discharged before being connected. All work, including connecting probe amplifiers to the oscilloscope, should be performed at a static-safe work station as shown in the following figure.

Figure 8 Static-Safe Workstation

Both types of ESD protection illustrated in the above figure, when used together, provide a significant level of ESD protection. When used alone, only the table-mat and wrist-strap combination provides adequate ESD protection. To ensure user safety, the static-safe accessories must provide at least 1 MW of isolation from ground. Purchase acceptable ESD accessories from your local supplier.

You can plug the ESD wrist strap into the front-panel ground socket of the oscilloscope as seen in the following picture.

32 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Proper Handling of Probe Amplifier and Probe Heads 4

WARNING

Figure 9 Wrist Strap Connected to Oscilloscope’s Ground Socket

These techniques for a static-safe workstation should not be used when working on circuitry with a voltage potential greater than 500 volts.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 33

4 Proper Handling of Probe Amplifier and Probe Heads

CAUTION

Probe Amplifier and Probe Heads Handling Precautions

Precautions for the Probe Amplifier

The probe amplifier has been designed to withstand a moderate amount of physical and electrical stress. Store the probe and its probe heads in a shock-resistant case such as the foam-lined shipping case which came with the probe.

Do not apply excessive force to the probe end and prevent it from receiving mechanical shock. This damage is considered to be abuse and will void the warranty when verified by Keysight Technologies service professionals.

Do not drop heavy objects on the probe, drop the probe from large heights, spill liquids on the probe, etc. Any of these examples can significantly degrade the performance of the probe.

Precautions for the Probe Cable

Do not twist, tightly bend, or kink the probe amplifier cable to avoid degrading the probe’s performance.

When storing the probe, it is best to coil the cable in a large radius and avoid a net twist in the cable during the process. This can be done in a similar manner to how garden hoses or extension cords are typically coiled.

34 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Proper Handling of Probe Amplifier and Probe Heads 4

CAUTION

Precautions while Connecting and Disconnecting Probe Heads

Safely Connecting/Disconnecting the Probe Amplifier and Oscilloscope

Always perform the connection in the following sequence:

1 Ground the DUT to the oscilloscope via the AC mains ground or to the

oscilloscope ground or to the probe amplifier ground.

2 Connect the probe head to the DUT.

3 Connect the probe amplifier to the grounded oscilloscope.

4 Connect the probe head to the probe amplifier.

Never allow the probe head to be connected to the probe amplifier, if the probe amplifier is not connected to an oscilloscope channel.

Always perform the disconnection in the following sequence:

1 Disconnect the probe head from the probe amplifier.

2 Disconnect the probe amplifier from the oscilloscope.

3 Disconnect / unsolder the probe head from the DUT.

This sequence is also applicable when moving the probe amplifier from one oscilloscope channel to another.

Safely Connecting/Disconnecting the Probe Amplifier and Probe Head

When connecting a probe head to a probe amplifier, push the probe head connectors straight in the amplifier’s sockets. When disconnecting a probe head from an amplifier, pull the probe head connectors straight out of the sockets.

Never bend the probe head in order to pry it loose from the amplifier. Also, do not wiggle the probe head up and down or twist it to remove the connectors from the sockets. This can damage the pins in the amplifier or probe head.

Moving the Probing Setup to Different Probing Locations

When making measurements, you may often need to probe different locations on the DUT.

• For the MX0105A SMA head or the N2839A browser probe head, you can safely move the probe head from one location to another without having to first break the amplifier-to-head connection.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 35

4 Proper Handling of Probe Amplifier and Probe Heads

• For a solder-in or a ZIF tip probe head, always disconnect the probe head from the amplifier before unsoldering, moving to a new position, and resoldering the probe head. This is because some soldering-iron tips can hold a charge which can damage the probe amplifier.

36 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Proper Handling of Probe Amplifier and Probe Heads 4

CAUTION

Correct securing methods

Incorrect securing method with

glue on the probe head tip

Strain Relieving Techniques for Probe Heads

High-performance probes have small physical geometries to ensure the lowest possible loading and the best electrical response. Because of their small size, probe heads are often delicate. It is important to mechanically secure your probe heads to protect both your equipment and designs from damage.

The following are some of the strain relief methods that you can use for your probe amplifier/probe head. Different probe heads can have different cable stiffness. Choose a strain relief method appropriate for the cable stiffness.

• Tack Putty (recommended)

• Low-temperature hot glue (recommended)

• Non-conductive double-sided tape

• Hook-and-loop

Do not use aggressive adhesives, super glues, or high temperatures. Do not get the low temperature hot glue on the probe head tip as this can damage the precision components of your probing system (only use the low temperature hot glue on the probe head cables).

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 37

Figure 10 Correct and incorrect strain relief techniques

4 Proper Handling of Probe Amplifier and Probe Heads

CAUTION

Tack-putty

Wrap a small amount of tack-putty around your probe head cables, taking care to not pinch them. The mass can then be secured to a rigid body near your DUT. Similar techniques can be used to secure probe amplifiers where you apply some tack-putty to the underside of the probe amplifier body and attach it to a rigid body near your DUT.

Figure 11 Probe Secured Using Tack Putty

You can also use putty with a positioner such as the N2787A as shown below.

Figure 12 Using Putty With the N2787A 3D Probe Positioner

Low-temperature hot glue

You can also use low-temperature hot glue to secure cables.

Only use low-temperature hot glue. To remove the hot glue, warm it with a heat gun set on low. Only heat the hot glue enough to remove it.

Figure 13 Probe Secured Using Low-Temperature Hot Glue

38 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Velcro Pads

Proper Handling of Probe Amplifier and Probe Heads 4

The provided Velcro pads can be used to secure your probe amplifier casing to the board. Attach Velcro dots to the probe amplifier as well as the circuit board as shown in the figure below.

Figure 14 Using Velcro Dots

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 39

4 Proper Handling of Probe Amplifier and Probe Heads

Tips for Soldering Probe Heads

Given below are a few soldering tips that apply to all probe heads that require soldering to DUT. The specific details related to the soldering procedure for each probe head are included in the chapter dedicated to that probe head in this guide.

• Use a temperature-controlled soldering iron station, if possible.

• Set the temperature of the soldering iron’s tip to between 370° C and 420° C (for non RoHS standards).

• Use the smallest tip possible.

• Use an optical aid of some sort (microscope preferred).

• Employ minimal dwell times on the solder joint (< 2 seconds).

• Solder only the tip of the wire onto your DUT. The solder should not get close to the existing solder ball on the tip.

• Apply enough flux to probe head leads and wires when soldering the tips into a DUT.

Cleaning

Proper Handling of Probe Amplifier and Probe Heads 4

If the probe amplifier or probe head requires cleaning:

1 Disconnect the probe head from the probe amplifier.

2 Disconnect the probe amplifier from the oscilloscope.

3 Disconnect the probe head from any circuit under test.

4 Gently clean the probe amplifier /probe head with a soft cloth dampened with a

mild soap and water solution.

5 Wipe with clean water and then dry thoroughly with a clean cloth.

6 Make sure that the probe amplifier / probe head is completely dry before

reconnecting it to an oscilloscope or circuit under test.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 41

4 Proper Handling of Probe Amplifier and Probe Heads

42 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Keysight InfiniiMax RC Probe Amplifier and Probe Heads

NOTE

User’s Guide

5 Characteristics and

Specifications

MX0023A Probe Amplifier Warranted Specifications 44 MX0023A Probe Amplifier Characteristics 45 InfiniiMax RC Probe Heads Characteristics 47 Environmental and General Characteristics 48

The tables in this chapter list the specifications and characteristics for the MX0023A probe amplifier and its supported probe heads.

All entries included in this chapter are characteristics unless otherwise noted. These are the typical performance values of the MX0023A probe amplifier with different probe heads. Bandwidth (for the probe) and DC Input Resistance (R the only warranted specifications for the MX0023A probe amplifier.

and R

diff

) are

5 Characteristics and Specifications

MX0023A Probe Amplifier Warranted Specifications

Table 9 Warranted Specifications

Probe Amplifier Probe Head Specification

MX0023A 25 GHz Probe Amplifier

MX0100A Micro Probe Head

Bandwidth 25 GHz (with 60 mil leads)

DC Input Resistance

= 50 kW ±2%

diff

= 25 kW ±2%

44 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0023A Probe Amplifier Characteristics

The characteristics listed in the following table are mainly determined by the probe amplifier.

Characteristic MX0023A Probe Amplifier

Characteristics and Specifications 5

With 25kW Probe Heads

(MX0100A, MX0106A, N2839A,

With MX0105A SMA Probe

Head

MX0105A, N5425B, N5381B)

DC Input Resistance R

= 25 kW ± 2% each input to

50 W to V

term

ground R

= 50 kW ± 2%

diff

Maximum Input Power NA 100 mW or 2.28V

(Vin-Vcm_term) into 50W

Input Voltage Range (Differential or Single Ended)

0.6 Vpp, ±0.3 V at 1:1 attenuation

2.5 Vpp, ± 1.25 V at 4:1 attenuation

0.38 Vpp, ± 0.19 V at 1:1.57 attenuation

1.54 Vpp, ± 0.77 V at 2.57:1 attenuation

Input Common Mode Range ± 8 V

to 100 Hz

± 0.5 V > 100 Hz at 1:1 attenuation, ±4 V

± (4.3 V – Vcm_term x 0.29) (DC to 100 Hz), ± 0.19 V at 1:1.57 attenuation, ± 0.77 Vat 2.57:1 attenuation (> 100 Hz)

Maximum Signal Slew Rate 25 V/ns when probing a

single-ended signal 40 V/ns when probing a differential

signal

16 V/ns when probing a single-ended signal

26 V/ns when probing a differential signal

rms

DC Attenuation Ratio 1:1 or 4:1 Automatically selected

based on volts/division setting

1:1.56 or 2.57:1 Automatically selected based on volts/division setting

Offset Range (for probing a

±16 V

single-ended signal)

Offset Accuracy < 3%

Zero offset error referred to

< 2 mV x DC attenuation < 2 mV

input

Input referred noise, in spectral density

Input referred noise, in mVrms

25.0 nV/√(Hz) @1:1

39.7 nV/√(Hz) @4:1

3.95 mVrms @1:1 & 25 GHz

6.28 mVrms @4:1 & 25 GHz

16 nV/rt(Hz) @1:1.56

25.5 nVrt(Hz) @2.57:1

2.26 mVrms @1:1.56 & 20 GHz

3.61 mVrms @ 2.57:1 & 20 GHz

Propagation delay

~6.1 nsec

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 45

5 Characteristics and Specifications

Characteristic MX0023A Probe Amplifier

With 25kW Probe Heads

(MX0100A, MX0106A, N2839A,

With MX0105A SMA Probe

Head

MX0105A, N5425B, N5381B)

Maximum Non-destructive

30 V

mains isolated

peak

See maximum input power

Input Voltage

a Delay can be skewed relative to other signals.

b Mains isolated is for measurements performed on circuits not directly connected to a mains supply.

46 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

InfiniiMax RC Probe Heads Characteristics

NOTE

The characteristics listed in Table 10 are mainly determined by the InfiniiMax RC probe heads available for the MX0023A probe amplifier.

Table 10 Characteristics for InfiniiMax RC Probe Heads Using MX0023A Probe Amplifier

Characteristics and Specifications 5

Input Capacitance

Probe Head Cdiff Cse

MX0100A Micro probe

head (with 60 mil leads)

MX0100A Micro probe

head (with 135 mil leads)

MX0106A Differential

Solder-in Probe Head

N2839A InfiniiMax II Browser Probe Head

MX0105A Differential

SMA Probe Head

N5425B Differential ZIF

Probe Head

(With N5426A ZIF Tip)

170 fF 260 fF 25 GHz 17.4 pS 12.3 pS

170 fF 260 fF 12 GHz 36.3 pS 25.7 pS

170 fF 290 fF 23 GHz 18.9 pS 13.4 pS

205 fF 340 fF 21 GHz 20.7 pS 14.7 pS

330 fF 530 fF 18 GHz 24.1 pS 17.1 pS

For information on the characteristics and specifications for the following InfiniiMax I and II probe heads that are compatible for use with the MX0023A probe amplifier, refer to the Keysight 1168/9B-Series Differential and Single-Ended Probes user’s guide. Visit

www.keysight.com/find/1169B to download this guide.

- N5381B Differential Solder-in Probe Head

- N5380B Differential SMA Probe Head

- N5425B ZIF Probe Head with N5451A Long Wire ZIF Tips

- E2677B Differential Solder-in Probe Head

- E2678B Differential Socketed Probe Head

- E2675B Differential Browser Probe Head

Bandwidth

(–3 dB)

NA 20 GHz 21.8 pS 15.4 pS

10 – 90%

Tra nsit io n Ti me

20 – 80%

Transition Time

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 47

5 Characteristics and Specifications

Environmental and General Characteristics

Table 11 Environmental and General Characteristics of MX0023A amplifier and InfiniiMax RC

Probe Heads

Environmental Condition Operating Non-Operating

Temperature +5 °C to +40 °C –40 °C to +70 °C

Humidity Up to 95% relative humidity

(non-condensing) at +40 °C

Altitude Up to 4,600 meters Up to 15,300 meters

Dimensions Refer to the Dimensions section in the chapter dedicated to each

probe head in this guide.

Weight 211 g (probe only)

790 g (probe with case and contents)

1.34 kg (probe with packaging)

Pollution Degree Pollution Degree 2

Normally only non-conductive pollution occurs. Occasionally, however, a temporary conductivity caused by condensation must be expected.

Up to 90% relative humidity at +65 °C

48 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Keysight InfiniiMax RC Probe Amplifier and Probe Heads

User’s Guide

6 MX0100A InfiniiMax Micro

Probe Head

Overview 50 MX0100A Probe Head Kit Components 51 MX0100A Dimensions 51 MX0100A Input Impedance 53 Setting up and Using the MX0100A Probe Head 56 Trimming the Lead Wires of MX0100A Probe Head 56 Soldering an MX0100A Probe Head to DUT 57 Maintaining the MX0100A Probe Head 60 MX0100A Probe Head Handling Precautions 60 Replacing the MX0100A Probe Tip Lead Wires 63

Extreme Temperature Testing with the MX0100A Probe Head 66

6 MX0100A InfiniiMax Micro Probe Head

MX0100A Probe

Head

MX0103A Bullet

Adapter

InfiniiMax RC

Probe Amplifier

Overview

The MX0100A is a solder-in head designed to access small geometry target devices. The probe head is made out of flex printed circuit, making it light, flexible, small yet highly usable. It provides up to 25 GHz of full probe amplifier bandwidth when used with the MX0023A and excellent probe loading characteristic (170 fF). You can replace and trim the probe head’s gold plated nickel tip lead.

The probe head offers wide operating temperature range of -55 °C to +150 °C (per JEDEC JESD22-A104 revision E spec), making it ideal for environmental chamber testing with the probe head soldered to the DUT inside the chamber.

This probe head connects easily to the InfiniiMax RC probe amplifier using the bullet adapter shipped with the probe head.

Figure 15 MX0100A probe head connected to InfiniiMax RC probe amplifier

For connection to a DUT, it has pre-wired probe tip leads that allow solder-in connection to very small, fine pitch targets.

Figure 16 MX0100A probe head connected to DUT and InfiniiMax probe amplifier

See page 43 for characteristics and specifications of MX0100A probe head and MX0023A probe amplifier.

50 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

NOTE

When probing differential signals, the + and – connection of the MX0100A probe head can be determined when the probe head is plugged into the probe amplifier. The + and - indicators on the probe amplifier represent the + and - inputs on MX0100A probe head. When probing single-ended signals, ensure that the - input of the probe amplifier is connected to the ground of the DUT.

MX0100A Probe Head Kit Components

Table 12 MX0100A Probe Head Kit Components

Component Option 001 Option 002 Option 003 Part Number

MX0100A InfiniiMax Micro Probe Head 6

Quantity *

Micro Probe Heads (with pre-wired probe tips)

Probe Tip Wire (.004" diameter)

(To make ground connections)

Bullet Adapter 1 5 10 MX0103A

Trim Gauge Template (see Figure 20) 1 5 10 MX0100-94302

* Quantity varies based on the purchased option.

MX0100A Dimensions

All dimensions in Figure 17 are in mm [inches].

5 25 50 MX0100A

1 wire spool 5 wire

spools

10 wire spools

MX0102-21301

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 51

6 MX0100A InfiniiMax Micro Probe Head

Figure 17 MX0100A Probe Head Dimensions

52 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0100A Input Impedance

NOTE

Input impedance is a function of the probe head only. The probe amplifier bandwidth (25 GHz) does not have any effect on the input impedance of the probe head.

This section provides:

• the SPICE model for MX0100A. This SPICE model is only for input impedance which allows modeling of the probe loading effects. Probe transfer function is generally flat to the specified bandwidth.

• an input impedance plot for MX0100A to show the matching of the measured data to the modeled data. Matching is generally very good up to the specified bandwidth of the probe head.

Refer to the chapter “InfiniiMax RC Probe Amplifier and Probe

Heads System Responses" on page 143 to get a typical corrected

frequency response and CMRR for the MX0100A probe head and MX0023A probe amplifier combination.

MX0100A InfiniiMax Micro Probe Head 6

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 53

6 MX0100A InfiniiMax Micro Probe Head

MX0100A SPICE Model

The following SPICE model can be used to predict the probe loading effects of the InfiniiMax RC probe and MX0100A probe head combination.

Figure 18 SPICE Model for the input impedance of the MX0100A Micro Probe Head

54 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0100A InfiniiMax Micro Probe Head 6

SPICE Deck and Measured/Modeled Data Matching

.subckt MX0100A 1 2 RTipP 1 3 11.58 RTipM 2 4 11.58 C1 3 5 48.86f L1 5 6 24.79n R1 6 4 1.589k Rp1 7 3 88.3 Lp1 8 7 .845n Cp1 11 8 .223p Rm1 4 9 88.3 Lm1 9 10 .845n Cm1 10 11 .223p Rp2 11 3 25k Rp3 4 11 25k RG0 11 12 130.8 L2 12 0 964.6p L3 11 0 30u .END

Figure 19 Input Impedances (Zin Modeled and Zin Measured) for the MX0100A Probe Head

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 55

6 MX0100A InfiniiMax Micro Probe Head

NOTE

Setting up and Using the MX0100A Probe Head

Trimming the Lead Wires of MX0100A Probe Head

Before soldering, trim the probe head’s lead wires matching your DUT’s geometry. You can choose from the following lead wire lengths:

• 135 mil (3.4 mm) - The probe head is shipped with this factory-trimmed standard length. Use this lead wire length to accommodate variable-pitch targets. With this length, you get the maximum convenience in terms of longer reach with 12 GHz bandwidth but at the expense of more variation in response and higher probe loading.

• 60 mil (1.5 mm) - If your DUT’s geometry allows you to use shorter lead wire length, trim the wires to this length to get the maximum performance and 25 GHz bandwidth. Use this lead wire length to accommodate small fine-pitch targets. The available bandwidth is the full bandwidth of the probe amplifier being used.

You need to specify your choice of lead wire length (3.4 mm or 1.5 mm) in the Probe Configuration dialog box of the Infiniium software GUI (see

page 126). This allows the software to load the appropriate s parameter file

applicable to that wire length. The s parameter file adjusts the frequency response to enhance the measurements accuracy.

To properly trim the probe head’s lead wires

1 Use the Keysight supplied trim gauge template that is included as part of the

MX0100A probe head kit.

Figure 20 MX0100A Trim Gauge Template (MX0100-94302)

2 Using tweezers, place the lead wire over the outline of the lead wires as shown

on the trim gauge template. The trim gauge template displays two lengths:

3.4 mm and 1.5 mm. Choose the correct length as per your DUT.

3 Using the cutting tweezers, trim the lead wires even with the trim lines.

56 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

NOTE

You can spread the probe head’s lead wires within the range of 0mm to 7mm

NOTE

span without causing any significant variation in its available bandwidth.

Soldering an MX0100A Probe Head to DUT

The tools included in the MX0102A soldering toolkit can be of great use while soldering the MX0100A probe head to DUT (see page 20). You may purchase this toolkit separately.

To solder the probe tip lead wires to DUT

1 Trim the length of the MX0100A probe head lead wires to match your DUT’s

geometry (see page 56). You may use the cutting tweezers (Keysight part number 8710-2838) included in the Soldering toolkit.

MX0100A InfiniiMax Micro Probe Head 6

2 Apply flux to both DUT and MX0100A probe tip lead wires. Always use plenty of

flux, even if your solder already contains flux. This cleans the solder joint and allows for easier flowing solder and quicker dwell times.

3 Add solder to existing test points on DUT, if necessary. Heat momentarily and

do not dwell any longer than necessary!

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 57

6 MX0100A InfiniiMax Micro Probe Head

NOTE

Connect the MX0100A probe head’s lead wires to DUT by positioning these

wires on DUT and then reflowing joint while heating momentarily. .

Keep the temperature as low as possible while still reflowing the solder at the joint of concern. The following are some of the useful tips to maintain low temperature during soldering.

- A temperature-controlled soldering iron is the best way to do this. Set it for no more than 350

C if using standard lead-free solders and 150oC for

tin-bismuth solder.

- Do not rest a soldering iron on a probe joint for more than a few seconds.

5 Provide strain-relief to the probe head by taping its mid portion to a flat surface

such as a tabletop using the double-sided foam tape (such as Keysight part number 0460-3122 included in the MX0102A Soldering Toolkit). You can also use putty, Velcro or low temperature hot glue instead.

6 Connect the soldered MX0100A probe head to the InfiniMax probe amplifier

using the supplied MX0103A bullet adapter.

58 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0100A InfiniiMax Micro Probe Head 6

NOTE

Provide strain-relief to the probe head and probe amplifier plastic housings by

using a double-sided foam tape (Keysight part number 0460-3122 included in the MX0102A Soldering Toolkit)..

To view a demo on how to solder the lead wires to the DUT, visit

https://prc.keysight.com/ and access the demo under the Videos

section.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 59

6 MX0100A InfiniiMax Micro Probe Head

Maintaining the MX0100A Probe Head

MX0100A Probe Head Handling Precautions

One of the advantages of the MX0100A probe head is its reusability feature. This section describes some of the cautions and tips on how to properly handle the MX0100A probe head to prevent damage and maintain high performance and reusability of the probe head.

To prevent damage and ensure reusability of the MX0100A probe head

• After you have connected the MX0100A probe head electrically to a DUT via solder, it is best to secure it mechanically as well. Always provide strain relief to the probe head setup using putty, velcro, low temperature hot glue, or double-sided foam tape to prevent any unnecessary strain to the probe head and to protect delicate connections.

• Strain relief is recommended at the probe head and amplifier housings as well as at the probe head cable.

Figure 21 Example of a properly strain-relieved MX0100A probe head setup

• While moving a soldered MX0100A probe head, always ensure that you do not twist, pull, tightly bend, or apply force near the probe head’s cable housing.

Figure 22 Example of correct movement of MX0100A probe head

60 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0100A InfiniiMax Micro Probe Head 6

Figure 23 Example of incorrect movement of MX0100A probe head

• Use a microscope setup while performing soldering/de-soldering tasks. A microscope with the following features is recommended.

• Binocular eyepieces

• Adjustable magnification (at least 20x)

• Good working distance from the sample (at least 4 inches)

• Adjustable arm

• Integrated ring light around the objective lens

• Ensure that there is less thermal stress on the probe head as well as DUT by:

• Using a high quality temperature controlled soldering iron with the tip

temperature set as low as possible (just high enough to melt the alloy).

• Using a low temperature solder alloy such as SAC (Tin / Silver / Copper)

with 220

C melting point), or tin-bismuth solder with 138 oC melting point.

• Do not apply heat on the probe tip leads for a time period longer than two seconds.

• Use a small solder iron tip (<1mm is recommended).

• No clean (non-conductive) and less acidic flux is recommended.

• While disconnecting the probe head from the MX0103A bullet adapter:

• either gently pull the bullet adapter from the probe head by hand

• or engage a flat screwdriver on the notch provided on the bullet adapter and

gently disconnect the probe head from bullet adapter.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 61

6 MX0100A InfiniiMax Micro Probe Head

To check the MX0100A probe head for any damage

You can use a Digital Multimeter to check the resistance measurement of your MX0100A probe head. If the resistance measurement between the probe head’s tip and the center conductor of the SMP connector is ~25.2 kohm, then the probe head is usable.

Figure 24 Resistance measurement for an undamaged MX0100A probe head

For a damaged probe head, the resistance measurement between the MX0100A probe head tip wire and the center conductor of the SMP connector of the MX0100A is displayed as Infinite.

Figure 25 Resistance measurement for a damaged MX0100A probe head

62 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Replacing the MX0100A Probe Tip Lead Wires

CAUTION

The MX0100A probe head comes equipped with replaceable resistor tips. If these resistor tips break, you can replace the tips without having to replace the entire probe head or having to send it back for repair. This section shows you how to install or repair the leads wires on the MX0100A probe head. Depending on your probing application, you can order either 9 mil or 10 mil solder wire as listed in the following table. These wires are also included in the Keysight MX0102A Soldering Toolki t (see page 20 for details).

Table 13 Required Wire Types

Wire Type Wire Diameter Part Number

MX0100A InfiniiMax Micro Probe Head 6

Regular Solder Wire (lead free) Requires standard lead-free soldering temperatures (330 °C to 350 °C).

(NOTE: This alloy melts at 217

Low Temperature Solder Wire (lead free) Requires a low temperature setting on your soldering iron.

(NOTE: This alloy melts at 138

1 Secure the tip of the MX0100A probe head on a raised off position from the

C.)

.009" diameter MX0102-21302

.010" diameter MX0102-21303

table. You may use a double-sided foam tape (Keysight part number 0460-3122 included in the MX0102A Soldering Toolkit). Keep the lead wires solder joints off the raised base to facilitate soldering. Cover the entire probe head tip with Kapton tape while ensuring that the lead wires solder joints are fully exposed for soldering.

2 Remove the damaged lead wire from the via by grabbing it with tweezers and

pulling up very gently. Touch the soldering iron to the solder joint just long enough for the lead wire to come free of the probe head tip.

To avoid burning and damage to the probe head, do not keep the soldering iron in contact with the tip any longer than necessary. The solder joint quickly melts and releases the wire.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 63

6 MX0100A InfiniiMax Micro Probe Head

Position the end of the new lead wire (Keysight part number MX0102-21302 or

MX0102-21303 included in the MX0102A Soldering Toolkit) over the via hole. Touch the soldering iron to the side of the hole. As the solder in the hole melts down, the lead wire will fall into the hole. Remove soldering iron as soon as the lead wire falls into the hole.

4 Apply flux on the solder joint and then apply a small amount of solder to the tip

of the soldering iron. Touch the solder tip (with the solder on it) to the solder joint. Do not dwell on the joint with the solder iron any longer than needed. The solder should flow off the soldering iron tip into the joint. If it does not flow, then sufficient flux may not have been used.

64 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0100A InfiniiMax Micro Probe Head 6

Cut the extra wire off using a cutting tweezer (Keysight part number 8710-2838

included in the MX0102A Soldering Toolkit).

6 Remove the Kapton tape.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 65

6 MX0100A InfiniiMax Micro Probe Head

CAUTION

Extreme Temperature Testing with the MX0100A Probe Head

The MX0100A probe head can withstand temperatures from –55°C to +150°C thereby making it suitable for extreme temperature environments such as temperature chambers. For extreme temperature testing, use the MX0100A probe head with the N5450B InfiniiMax extreme temperature extension cable.

InfiniiMax probe amplifiers cannot withstand extreme temperatures (–55°C to +150°C) that the MX0100A probe head can withstand. Be cautious not to subject these probe amplifiers to extreme temperatures. Using the N5450B extension cable with the MX0100A probe head physically separates the amplifier from the probe head and therefore eliminates the chances of the amplifier’s exposure to extreme temperatures.

To know more about how to use MX0100A in extreme temperatures and the associated cautions, refer to “Extreme Temperature Probing" on page 139.

66 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Keysight InfiniiMax RC Probe Amplifier and Probe Heads

User’s Guide

7 MX0106A InfiniiMax

Differential Solder-in Probe Head

Overview 68 MX0106A Probe Head Supplied Accessories 68 MX0106A Dimensions 68 MX0106A Input Impedance 70 Setting up and Using the MX0106A Probe Head 73 Adjusting the Spacing between MX0106A Wires 73 Installing / Replacing the MX0106A Probe Head Wire Leads 73 Connecting the MX0106A Probe Head to DUT 77 Soldering the MX0106A Probe Head to DUT 78 Extreme Temperature Testing with the MX0106A Probe Head 79

7 MX0106A InfiniiMax Differential Solder-in Probe Head

Overview

The MX0106A probe head allows a soldered connection into a system for a reliable hands-free probing. This probe head configuration provides 23 GHz bandwidth and a low capacitive loading for measuring both single-ended and differential signals.

For connection to a DUT, this probe head uses strong 7 mil (or optional 4 mil) diameter nickel wires that allow solder-in connection to very small, fine pitch targets. The solder-in head allows for wide operating temperature of -55 °C to +150 °C.

See page 43 for characteristics and specifications of MX0106A probe head and MX0023A probe amplifier.

MX0106A Probe Head Supplied Accessories

Table 14 Supplied Accessories

Accessory Quantity Part Number

0.007 inch tin-plated nickel wire kit

(Includes wire and trim gauge)

0.004 inch tin-plated nickel wire 1 MX0102-21301

MX0106A Dimensions

All dimensions in the figure below are in mm [inches].

1 01169-81301

68 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0106A InfiniiMax Differential Solder-in Probe Head 7

Figure 26 MX0106A Probe Head Dimensions

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 69

7 MX0106A InfiniiMax Differential Solder-in Probe Head

NOTE

MX0106A Input Impedance

Input impedance is a function of the probe head only. The probe amplifier bandwidth (25 GHz) does not have any effect on the input impedance of the probe head.

This section provides:

• the SPICE model for MX0106A. This SPICE model is only for input impedance which allows modeling of the probe loading effects. Probe transfer function is generally flat to the specified bandwidth.

• an input impedance plot for MX0106A to show the matching of the measured data to the modeled data. Matching is generally very good up to the specified bandwidth of the probe head.

Refer to the chapter “InfiniiMax RC Probe Amplifier and Probe

Heads System Responses" on page 143 to get a typical corrected

frequency response and CMRR for the MX0023A probe amplifier and probe head combination.

70 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0106A InfiniiMax Differential Solder-in Probe Head 7

MX0106A SPICE Model

The following SPICE model can be used to predict the probe loading effects of the InfiniiMax RC probe and MX0106A probe head combination.

Figure 27 SPICE Model for the input impedance of the MX0106A Probe Head

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 71

7 MX0106A InfiniiMax Differential Solder-in Probe Head

SPICE Deck and Measured/Modeled Data Matching

.subckt MX0106A 1 2 RTipP 1 3 42.1877 RTipM 2 4 42.1877 C1 3 5 11.5513f L1 5 6 4.97914n R1 6 4 10.392k Rp1 7 3 93.7363 Lp1 8 7 .304785n Cp1 11 8 298.107f Rm1 4 9 93.7363 Lm1 9 10 .304785n Cm1 10 11 298.107f Rp2 11 3 25k Rp3 4 11 25k RG0 11 12 96.1286 L2 12 0 300.174p L3 11 0 30u .END

Figure 28 Input Impedances (Zin Modeled and Zin Measured) for the MX0106A Probe Head

72 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0106A InfiniiMax Differential Solder-in Probe Head 7

CAUTION

NOTE

Setting up and Using the MX0106A Probe Head

Adjusting the Spacing between MX0106A Wires

Figure 29 shows how to adjust the spacing of the probe head’s wires without

stressing the solder joint.

Use tweezers to grab and stabilize the lead near the pc board edge. Then, without moving the tweezers, position the wires as needed. Stabilizing the wire near the solder joint reduces stress at the solder joint. The wires will then last much longer with multiple adjustments.

Figure 29 Adjusting Spacing Without Stressing Solder Joint

The span of leads can be adjusted from 8 to 130 mils (0.2 mm - 3.3 mm).

Installing / Replacing the MX0106A Probe Head Wire Leads

The lead wires of the MX0106A probe head are replaceable.

The following two types of wires are available for installation/replacement on the MX0106A probe head tip.

Table 15 Required Wire Type

Part

Wire Diameter

0.007 inch (tin-plated nickel wires) 01169-81301

0.004 inch (tin-plated nickel wires) MX0102-21301

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 73

Number

7 MX0106A InfiniiMax Differential Solder-in Probe Head

CAUTION

Table 16 Recommended Equipment

Equipment

Vise or clamp for holding tip

Metcal STTC-022 (600 °C) or STTC-122 (700 °C) tip soldering iron or equivalent. The 600 °C tip will help limit burning of the FR4 tip PC board.

0.381 mm (0.015 in) diameter RMA flux standard tin/lead solder wire

Fine stainless steel tweezers

Rosin flux pencil, RMA type (Kester #186 or equivalent)

Flush cutting wire cutters

Magnifier or low power microscope

Keysight supplied trim gauge (01169-23801)

Use the following procedure to install or replace the wire leads of the MX0106A probe head.

1 Use the vise or tweezers clamp to position the tip an inch or so off the work

surface for easy access.

If using a vise, grip the probe head tip on the sides with light force. When tightening the vise, use light force to avoid damaging the solder-in probe head.

If using a tweezers clamp, grip the probe head tip either on the sides or at the top and bottom.

Figure 30 Clamping the MX0106A Probe Head

74 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0106A InfiniiMax Differential Solder-in Probe Head 7

CAUTION

NOTE

CAUTION

If you need to replace an existing or a damaged wire lead, grab it with tweezers

and pull it gently up. Touch the soldering iron to the solder joint just long enough for the wire to come free of the probe head tip. The solder joint has very low thermal mass, so the joint quickly melts and releases the wire.

When replacing the wire leads of MX0106A, be cautious not to keep the soldering iron in contact with the probe head tip any longer than needed to avoid reflowing the components during the procedure.

Applying heat from the underside of the probe can help in preventing the soldering joint to be undone from the components closer to the wire leads.

Make sure the soldering iron tip is free of excess solder.

3 If needed, fill the mounting hole with solder in preparation for the new wire.

4 Use the flux pencil to coat the solder joint area with flux.

5 Cut two wires to a length of about 12.7 mm (0.5 inches).

6 Using tweezers, put a 90° bend at the end of the wire. Leave enough wire at the

bend such that it will protrude through the board when the wire is installed.

7 Holding the wire in one hand and the soldering iron in the other hand, position

the end of the wire lead over the solder filled hole. Touch the soldering iron to the side of the hole. When the solder in the hole melts, the wire lead will fall into the hole. Remove soldering iron as soon as the lead falls into the hole.

The thermal mass of the joint is very low, so taking extra time with the soldering iron in an attempt to ensure a good joint is not needed.

8 Cut the wires that protrude on the bottom side of the probe head board even

with the solder pad.

9 Place the wires through the hole in the supplied trim gauge with the probe head

perpendicular to the trim gauge.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 75

7 MX0106A InfiniiMax Differential Solder-in Probe Head

Trim Gauge

Figure 31 Trim Gauge on Probe Head

10 Cut the wires even with the trim gauge on the side opposite to the probe head.

Figure 32 Cutting Wires Flush with Gauge

Each wire lead needs to be trimmed to 0.89 mm to fit the hole in the pc board as shown in the following figure.

76 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0106A InfiniiMax Differential Solder-in Probe Head 7

NOTE

Figure 33 Wire Lead Trim Dimensions

Connecting the MX0106A Probe Head to DUT

The + and – connection for the MX0106A probe head can be determined when the probe head is plugged into the probe amplifier. The polarity markings on the probe amplifier represent the + and - inputs on the MX0106A probe head. Therefore, it does not matter which way the MX0106A tip is soldered.

When probing single-ended signals:

• ensure that the - input of the probe amplifier is connected to the ground of the DUT.

• orient the MX0106A probe head vertically. Laying the probe head flat causes coupling to the probe head tip that can degrade the probe performance.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 77

7 MX0106A InfiniiMax Differential Solder-in Probe Head

CAUTION

Soldering the MX0106A Probe Head to DUT

Always mechanically strain-relieve the probe head to protect your probing equipment and DUT from damage. Refer to “Strain

Relieving Techniques for Probe Heads" on page 37.

1 Apply flux to your target leads. The flux ensures a good and strong solder joint

without having to use an excessive amount of solder.

2 Tin the leads with a small amount of solder.

3 Use tweezers to form the probe head wires to fit your DUT’s geometry.

4 Apply flux to the DUT leads and your probe head wires.

5 Position the probe head wires on the DUT leads and quickly re-flow the solder.

Do not leave the soldering iron in contact with the probe head for more than a few seconds at a time.

For additional tips, refer to the topic “Tips for Soldering Probe Heads" on page 40.

78 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0106A InfiniiMax Differential Solder-in Probe Head 7

CAUTION

Extreme Temperature Testing with the MX0106A Probe Head

The MX0106A probe head can withstand temperatures from –55°C to +150°C thereby making it suitable for extreme temperature environments such as temperature chambers. For extreme temperature testing, use the MX0106A probe head with the N5450B InfiniiMax extreme temperature extension cable (see

page 19).

InfiniiMax probe amplifiers cannot withstand extreme temperatures (–55°C to +150°C) that the MX0106A probe head can withstand. Be cautious not to subject these probe amplifiers to extreme temperatures. Using the N5450B extension cable with the MX0106A probe head physically separates the amplifier from the probe head and therefore eliminates the chances of the amplifier’s exposure to extreme temperatures.

To know more about how to use MX0106A in extreme temperatures and the associated cautions, refer to “Extreme Temperature Probing" on page 139.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 79

7 MX0106A InfiniiMax Differential Solder-in Probe Head

80 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Keysight InfiniiMax RC Probe Amplifier and Probe Heads

User’s Guide

8 N2839A InfiniiMax II Browser

Probe Head

Overview 82 N2839A Browser Probe Head Components 82 N2839A Supplied Accessories 82 N2839A Dimensions 84 N2839A Input Impedance 84 Using the N2839A Browser Probe Head 88 Adjusting Spacing Between the Browser Tips 88 Hands-Free Probing 88 N2839A Probe Head Handling Precautions 90 Location of Serial Number 90 Replacing the Browser’s Tips 91

8 N2839A InfiniiMax II Browser Probe Head

Probe Tip

Probe Tip Arm

Tip Span Adjustment

Wheel

Overview

The N2839A differential browser is the best choice for signals browsing and general purpose troubleshooting of a circuit board. This probe head supports a bandwidth of 21 GHz when used with the MX0023A InfiniiMax RC probe amplifier. The probe head’s high bandwidth performance, adjustable tips, and ergonomic design makes it ideal for hand held measuring of differential and single-ended signals.

See page 43 for characteristics and specifications of N2839A probe head and MX0023A probe amplifier.

N2839A Browser Probe Head Components

Figure 34 N2839A Browser Probe Head Components

N2839A Supplied Accessories

Accessory Quantity Description

Straight probe tips (0.003 in. diameter, 0.113 in. long)

82 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

20 Straight tips are rigid but provide more robust

contact.

N2839A InfiniiMax II Browser Probe Head 8

NOTE

Accessory Quantity Description

Spring-loaded tips (0.0115 in. diameter, 0.126 in. long)

Tweezers 1 ESD safe tweezers to replace tips.

Protective end cap 1 Keep the protective end cap on the browser when

20 Spring-loaded tips are less susceptible to

vibration or movement than straight tips and provide more stable spring-loaded contact. Spring-loaded tips work best when these are either partially or fully compressed and are protected against over compression damage.

Refer to the topic “Replacing the Browser’s

Tips" on page 91 to know more.

the browser is not in use.

To purchase additional tips, order the N2837A kit that contains 20 spring-loaded tips and 20 straight tips.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 83

8 N2839A InfiniiMax II Browser Probe Head

NOTE

N2839A Dimensions

N2839A Input Impedance

Input impedance is a function of the probe head only. The probe amplifier bandwidth (25 GHz) does not have any effect on the input impedance of the probe head.

This section provides:

• the SPICE model for N2839A. This SPICE model is only for input impedance which allows modeling of the probe loading effects. Probe transfer function is generally flat to the specified bandwidth.

• an input impedance plot for N2839A to show the matching of the measured data to the modeled data. Matching is generally very good up to the specified bandwidth of the probe head.

84 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

N2839A InfiniiMax II Browser Probe Head 8

NOTE

Refer to the chapter “InfiniiMax RC Probe Amplifier and Probe

Heads System Responses" on page 143 to get a typical corrected

frequency response and CMRR for the InfiniiMax RC probe amplifier and probe head combination.

N2839A SPICE Model

The following SPICE model can be used to predict the probe loading effects of the N2839A probe head.

The S-parameters and spice models for the N2839A probe head remain the same for the spring-loaded tips and straight tips supplied with the browser.

Figure 35 SPICE Model for the input impedance of the N2839A Browser Probe Head

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 85

8 N2839A InfiniiMax II Browser Probe Head

SPICE Deck and Measured/Modeled Data Matching

* Input impedance SPICE subckt for probe head listed. .subckt N2839A 1 2 r1 1 3 41.09 r2 2 4 41.09 c10 3 17 95.34f c11 4 17 95.34f c1 17 5 100f c7 4 9 100f l1 5 6 8.126n l10 9 10 8.126n r3 6 3 139.7 r16 10 17 139.7 csrc1 3 7 35.6f l2 7 8 4.03n r4 8 4 1553.6 c4 17 11 93.1f c6 4 15 93.1f l6 11 12 .164n l9 15 16 .164n r6 12 3 71.92 r15 16 17 71.92 c5 3 13 17.68f l13 13 14 8.6n r5 14 4 273.2 r19 3 17 25k r10 4 17 25k r11 17 18 40.54 l7 18 0 .205n l8 17 0 47.23u ends

86 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

N2839A InfiniiMax II Browser Probe Head 8

Figure 36 Input Impedances (Zin Modeled and Zin Measured) for the N2839A Probe Head

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 87

8 N2839A InfiniiMax II Browser Probe Head

NOTE

Using the N2839A Browser Probe Head

Adjusting Spacing Between the Browser Tips

The spacing between the N2839A’s tips can be adjusted from 0 mm to 3 mm using the adjustment wheel shown in Figure 37.

Figure 37 Adjusting the Tip Spacing

The tip span setting does not impact the probe head’s frequency response.

Hands-Free Probing

For hands-free stability, you can:

• either mount the N2839A browser on an N2784/5A or N2787A probe positioner as displayed in the following figure.

88 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

N2839A InfiniiMax II Browser Probe Head 8

CAUTION

• or construct a custom holder using the mounting dimensions shown in the following figure. Use a M2 x 4 mm thread screw to attach the probe head.

Figure 38 Location and Dimensions of Mounting Hole

Do not allow the mounting screw to penetrate more than 4 mm into the browser’s mounting hole. Torque the mounting screw to 0.09 Nm (0.8 lb-in.).

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 89

8 N2839A InfiniiMax II Browser Probe Head

WARNING

CAUTION

Maintaining the N2839A Probe Head

N2839A Probe Head Handling Precautions

This section describes some of the cautions, warnings, and tips on how to properly handle and use the N2839A probe head to prevent damage/injury and maintain high performance and reusability of the probe head.

As the probe head tips are sharp, handle the N2839A with care to avoid injury.

When a tip is damaged, do not continue probing. Failure to replace the tip can result in permanent damage with the tip lodged into the tip arm’s socket. Refer to the topic “Replacing

the Browser’s Tips" on page 91.

Probing tips

When probing, observe the following tips:

• Compress the probe tips against the measurement point by applying gentle pressure along the probe’s axis.

• When possible, hold the browser vertical and perpendicular to the circuit board.

Location of Serial Number

When sending the probe head for repair or service, you need the serial number of the probe head.

When the N2839A browser is not in use, always snap the protective end cap onto the browser to protect the delicate browser tips. The physics of designing tips for high frequency, accurate measurements requires that the tip dimensions remain small.

When probing, do not apply a side load to the browser, which might result in damaged tips.

The N2839A’s serial number is located inside the browser’s head-to-amplifier connection as shown in the following figure.

90 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Figure 39 Location of Serial Number Label

Replacing the Browser’s Tips

Use the following procedure to install or replace the tips on the N2839A probe head. Replacement tips are supplied with the browser. For additional tips, you can order the N2837A replacement tip kit.

N2839A InfiniiMax II Browser Probe Head 8

Figure 40 Example of damaged tips

1 Adjust the browser’s tip span adjustment wheel so that the tip span is set to its

maximum range.

2 To remove an existing tip, use your fingers or the supplied ESD-safe tweezers.

Gently pull the tip straight out of the browser. Do not twist or turn the tip.

3 Pick up a new tip using the supplied tweezers. Identify the correct end to insert

into the probe tip arm as shown in Figure 41. The end of the tip that has the wider diameter is inserted into the tip arm.

4 Using the tweezers, align the new tip with the browser’s tip socket and gently

insert the tip while avoiding any twisting motion.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 91

8 N2839A InfiniiMax II Browser Probe Head

CAUTION

The probe tip arm can be damaged if too much force is applied when inserting the tip. The tip is held in the tip arm by friction and not by a snap or detent connection.

Figure 41 Inserting a Tip

5 Hold the probe vertically and gently press the tip on a hard surface, such as the

tweezers, to properly seat the tip.

92 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Keysight InfiniiMax RC Probe Amplifier and Probe Heads

User’s Guide

9 MX0105A InfiniiMax

Differential SMA Probe Head

Overview 94 MX0105A Probe Head Components 94 MX0105A Dimensions 96 MX0105A SPICE Subcircuit Data 97 MX0105A Input Return Loss (S11) 98

9 MX0105A InfiniiMax Differential SMA Probe Head

SMA Connectors

Semi-rigid SMA Cables

SMA Shorting

Adapter

Overview

The MX0105A SMA probe head allows an easy and a high bandwidth (20 GHz) connection using SMA cables.

Unlike coaxial cables that require two oscilloscope channels to measure a differential signal, this probe head requires a single oscilloscope channel to measure a differential signal. This allows you to acquire four signals simultaneously on an oscilloscope using these probe heads. This can be specially useful in situations such as viewing two lanes simultaneously with each lane having a differential pair.

The probe head’s cable loss is compensated.

The termination network on the probe head can accommodate different standards or needs including supplying a common DC voltage to the termination point.

See page 43 for characteristics and specifications of MX0105A probe head and MX0023A probe amplifier.

MX0105A Probe Head Components

Figure 42 MX0105A probe head connected to DUT and MX0023A probe amplifier

Table 17 MX0105A Probe Head Components

Component Description / Usage

SMA Connectors The two SMA connectors labeled in the picture above are for input signal

connection. The input resistance is 50 effects.

Ω on both these inputs to avoid probe loading

Semi-rigid SMA Cables These cables are formed in an offset configuration allowing you to use

these in variable spacing between connection points. These cables can be spread out to a maximum of 91.7 mm.

94 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0105A InfiniiMax Differential SMA Probe Head 9

Table 17 MX0105A Probe Head Components

Component Description / Usage

SMA Shorting Adapter The SMA shorting adapter connects one side of resistances on both

SMA inputs to ground. For signaling standards such as HDMI and MIPI MPhy that require the resistances to be referenced to a common DC voltage rather than a ground, you can remove this shorting adapter and apply a common dc termination voltage (± 4 V) using the supplied cable and a DC power supply. You can also control the termination voltage internally through the oscilloscope.

Extending the MX0105A Probe Head’s Cable Length

You can extend the cable length of the MX0105A SMA probe head and add flexibility and convenience to the probing setup by using the N5448B (25cm) / N2823A (1m) phase matched cable pair. You can easily replace the supplied semi-rigid SMA cables of the MX0105A probe head with these cables. These cables support 2.92 mm male-to-2.92 mm male connection. For detailed specifications of these cables, refer to the user’s guide available in the Document Library tab of www.keysight.com/find/N5448B.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 95

9 MX0105A InfiniiMax Differential SMA Probe Head

MX0105A Dimensions

Figure 43 MX0105A Dimensions (All dimensions are in mm[inches])

96 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

MX0105A SPICE Subcircuit Data

NOTE

The MX0105A SMA probe head is modeled by 20 short transmission lines of varying impedance. This accurately models the temporal nature of this probe head.

* Input SPICE subckt model for MX0105A .subckt MX0105A 1 t1 1 0 2 0 z0=51.9793 td=15ps t2 2 0 3 0 z0=50.5258 td=15ps t3 3 0 4 0 z0=51.7447 td=15ps t4 4 0 5 0 z0=49.5073 td=15ps t5 5 0 6 0 z0=44.7855 td=15ps t6 6 0 7 0 z0=46.0311 td=15ps t7 7 0 8 0 z0=48.87493 td=15ps t8 8 0 9 0 z0=49.2082 td=15ps t9 9 0 10 0 z0=51.4949 td=15ps t10 10 0 11 0 z0=43.2229 td=15ps t11 11 0 12 0 z0=57.0652 td=15ps t12 12 0 13 0 z0=43.3563 td=15ps t13 13 0 14 0 z0=49.3239 td=15ps t14 14 0 15 0 z0=51.3944 td=15ps t15 15 0 16 0 z0=44.1758 td=15ps t16 16 0 17 0 z0=54.6484 td=15ps t17 17 0 18 0 z0=53.9111 td=15ps t18 18 0 19 0 z0=50.7807 td=15ps t19 19 0 20 0 z0=49.9954 td=15ps t20 20 0 21 0 z0=49.5464 td=15ps r1 21 0 50 .end

MX0105A InfiniiMax Differential SMA Probe Head 9

Refer to the chapter “InfiniiMax RC Probe Amplifier and Probe

Heads System Responses" on page 143 to get a typical corrected

frequency response and CMRR for the MX0023A probe amplifier and MX0105A probe head combination.

InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 97

9 MX0105A InfiniiMax Differential SMA Probe Head

NOTE

MX0105A Input Return Loss (S11)

Input return loss is a function of the probe head only. The probe amplifier being used does not affect the return loss for the probe head. The graph displayed below therefore does not include the probe amplifier being used.

Figure 44 MX0105A Input Return Loss (S11)

98 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Keysight InfiniiMax RC Probe Amplifier and Probe Heads

User’s Guide

10 N5425B InfiniiMax Differential

ZIF Probe Head

Overview 100 Supported ZIF Tips 100 N5425B Probe Head and ZIF Tips Dimensions 102 N5425B Input Impedance 104 Using the N5425B Probe Head with N5426A ZIF Tips 111 Step 1 - Remove N5426A ZIF Tip from Packaging 111 Step 2 - Attach the N5426A ZIF Tip to the N5425B Probe Head 111 Step 3 - Solder the N5426A ZIF Tip to the DUT 112 Using the N5425B Probe Head with N2884A Fine Wire ZIF Tip 116 Step 1 - Calibrate the Probe 116 Step 2 - Place the N5425B ZIF Probe Head into the Positioner Arm 116 Step 3 - Install the Positioner Arm Into the Micropositioner 117 Step 4.- Secure the Micropositioner 117 Step 5 - Attach the Probe Head to Probe Amplifier 118 Step 6 - Remove a Fine Wire ZIF tip From the Case 118 Step 7 - Attach the ZIF Probe Head to the Fine Wire ZIF tip 118 Step 8. Attach the Fine Wire ZIF tip Onto the Board 119 Maintaining the N5425B Probe Head 123 Fine Wire ZIF Tips Handling Precautions 123

10 N5425B InfiniiMax Differential ZIF Probe Head

Overview

The N5425B Zero Insertion Force (ZIF) probe head is the best choice for probing multiple test points in a tight space. The three different types of ZIF tips available for use with this probe head accommodate very small fine pitch targets as well as variable pitch targets, including larger pitches.

When using this probe head, you can solder ZIF tips onto your DUT at multiple test points as needed. Because of the ZIF tip’s extremely low loading, the tips can remain on the DUT as you easily move the probe head from one probing site to the next.

Figure 45 N5425B Probe Head Attached to a ZIF Tip Soldered to DUT

See page 43 for characteristics and specifications of N5425B probe head and MX0023A probe amplifier.

Based on the type of ZIF tip used with this probe head, the bandwidth that the probe head supports with the MX0023A probe amplifier varies. Table 18 lists the bandwidth available for the ZIF tip/N5425B probe head/MX0023A probe amplifier combination.

Supported ZIF Tips

The N5425B probe head does not come with any ZIF probe tips. You need to separately order the supported ZIF tips matching your specific probing requirements.

100 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide

Keysight N5425B User Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Introduction

MX0023A Key Features

Compatibility with Keysight Oscilloscopes

Introduction to Supported Probe Heads

When to Use Which Probe Head

Other Recommended Accessories and Kits

N5450B Extreme Temperature Cable Extension Kit

N2880A InfiniiMax In-Line Attenuator Kit

N2881A InfiniiMax DC Blocking Capacitors

MX0102A Soldering Toolkit

N2852A AutoProbe II to AutoProbe III Adapter

MX0104A Performance Verification and Deskew Fixture Kit

N5448B (25cm) / N2823A (1m) Coaxial Phase Matched Cable Pair

N2812B (1m) High Performance Input Cable

E2669B Differential Connectivity Kit

Safety Checks and Warnings

Instrument Markings and Symbols

Avoiding Damage and Costly Repairs

Using a static-safe workstation

Probe Amplifier and Probe Heads Handling Precautions

Precautions for the Probe Amplifier

Precautions for the Probe Cable

Precautions while Connecting and Disconnecting Probe Heads

Safely Connecting/Disconnecting the Probe Amplifier and Oscilloscope

Safely Connecting/Disconnecting the Probe Amplifier and Probe Head

Moving the Probing Setup to Different Probing Locations

Strain Relieving Techniques for Probe Heads

Tack-putty

Low-temperature hot glue

Velcro Pads

Tips for Soldering Probe Heads

Cleaning

MX0023A Probe Amplifier Warranted Specifications

MX0023A Probe Amplifier Characteristics

InfiniiMax RC Probe Heads Characteristics

Environmental and General Characteristics

Overview

MX0100A Probe Head Kit Components

MX0100A Dimensions

MX0100A Input Impedance

Setting up and Using the MX0100A Probe Head

Trimming the Lead Wires of MX0100A Probe Head

Soldering an MX0100A Probe Head to DUT

Maintaining the MX0100A Probe Head

MX0100A Probe Head Handling Precautions

Replacing the MX0100A Probe Tip Lead Wires

Extreme Temperature Testing with the MX0100A Probe Head

Overview

MX0106A Probe Head Supplied Accessories

MX0106A Dimensions

MX0106A Input Impedance

Setting up and Using the MX0106A Probe Head

Adjusting the Spacing between MX0106A Wires

Installing / Replacing the MX0106A Probe Head Wire Leads

Connecting the MX0106A Probe Head to DUT

Soldering the MX0106A Probe Head to DUT

Extreme Temperature Testing with the MX0106A Probe Head

Overview

N2839A Browser Probe Head Components

N2839A Supplied Accessories

N2839A Dimensions

N2839A Input Impedance

Using the N2839A Browser Probe Head

Adjusting Spacing Between the Browser Tips

Hands-Free Probing

Maintaining the N2839A Probe Head

N2839A Probe Head Handling Precautions

Location of Serial Number

Replacing the Browser’s Tips

Overview

MX0105A Probe Head Components

MX0105A Dimensions

MX0105A SPICE Subcircuit Data

MX0105A Input Return Loss (S11)

Overview