Keysight MX0023A InfiniiMax RC User manual

Keysight MX0023A InfiniiMax RC
Probe Amplifier and Probe Heads
User’s Guide

Notices
© Keysight Technologies, 2020
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Manual Part Number
MX0023-97000
Edition
First Edition, February 2020
Published by:
Keysight Technologies, Inc.
1900 Garden of the Gods Road
Colorado Springs, CO 80907 USA
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Safety Notices
CAUTION
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 con-
ditions are fully understood and
met.
WARNING
A WARNING notice denotes a haz-
ard. It calls attention to an operat-
ing procedure, practice, or the like
that, if not correctly performed or
adhered to, could result in personal
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indicated conditions are fully
understood and met.

3
Contents
1 MX0023A Probe Amplifier - Overview
Introduction 8
MX0023A Key Features 10
Compatibility with Keysight Oscilloscopes 11
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
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

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

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

6 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide
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 Returning a Probe/Probe Head for Repair/Service
Contacting Keysight Technologies for Technical Assistance 150
15 Replacement Parts
MX0100A Probe Head 151
MX0106A Probe Head 151
N2839A Browser Head 152
Other Replacement Parts 152
Index

7
Keysight InfiniiMax RC Probe Amplifier and Probe Heads
User’s Guide
1MX0023A Probe Amplifier -
Overview
Introduction 8
MX0023A Key Features 10
Compatibility with Keysight Oscilloscopes 11

8 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide
1MX0023A Probe Amplifier - Overview
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.
Figure 1 MX0023A Probe Amplifier
Table 1 MX0023A Probe Amplifier Components
Probe Amplifier Component Description/Usage
Output Connector
(with AutoProbe II Connection to
Oscilloscope)
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.
Menu Button Press this button to bring up the Infiniium GUI’s Probe
Configuration dialog box on the oscilloscope. Use this dialog box
to configure probe settings (see page 125 ).
Output Connector
(with AutoProbe II
Connection to
Oscilloscope)
Probe Head Connector
Menu Button
Polarity
Markings
Channel Identification Rings
Ground Connection

MX0023A Probe Amplifier - Overview 1
InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 9
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).
Table 1 MX0023A Probe Amplifier Components
Probe Amplifier Component Description/Usage

10 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide
1MX0023A Probe Amplifier - Overview
MX0023A Key Features
Yielding Accurate
Measurements
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.
“RC" Input
Impedance
Architecture
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.
Two Input
Attenuation
Ranges
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
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.
High Bandwidth
Probing
Requirements
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.
Applicable
System
Bandwidth
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.

MX0023A Probe Amplifier - Overview 1
InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 11
Compatibility with 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.
Compatible Oscilloscope Adapter Required
Required Infiniium
Software Version
Infiniium Oscilloscopes with AutoProbe II Interface
UXR-Series (13-33GHz models) none 10.25 or higher
90000 Q, V, X, Z-Series none 6.55 or higher
Infiniium Oscilloscopes with AutoProbe III Interface
UXR-Series (40GHz 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
NOTE
The MX0023A probe amplifier is NOT compatible with Infiniium 9000
Series, InfiniiVision, or any previous generation Keysight oscilloscopes.

12 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide
1MX0023A Probe Amplifier - Overview

13
Keysight InfiniiMax RC Probe Amplifier and Probe Heads
User’s Guide
2Available Probe Heads and
Accessories - Overview
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
This chapter provides an overview of various probe heads and accessories that are
compatible for use with the MX0023A probe amplifier.

14 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide
2Available Probe Heads and Accessories - Overview
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:
The following figure displays these supported probe heads and accessories for
MX0023A.
Probe Head Where to Find Detailed Information
New InfiniiMax RC Probe Heads
(supporting higher bandwidths up to
25 GHz)
Detailed information on each of these probe heads is
available as separate chapters in this guide.
Existing InfiniiMax I and II Probe Heads
(supporting bandwidths up to 12 GHz)
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.
NOTE
InfiniiMax III and III+ probe heads are NOT compatible for use with the
MX0023A probe amplifier.

Available Probe Heads and Accessories - Overview 2
InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 15
Figure 2 MX0023A Probe Family Diagram

16 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide
2Available 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
Cdiff b
(pF)
Cse c
(pF)
1. MX0100A InfiniiMax Micro Probe Head (refer to page 49 for details)
•Light, flexible, and smallest solder-in head
•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
25 GHz 0.17 pF 0.26 pF
2. MX0106A Differential Solder-in Probe Head (refer to page 67 for details)
•The most reliable semi-permanent signal
access for high fidelity measurement
•Hands-free access to fine-pitch
components in high-density electronics
•Recommended for MIPI D-Phy 2.0 and
C-Phy 2.0
23 GHz 0.17 pF 0.29 pF
3. N2839A InfiniiMax II Browser Probe Head (refer to page 81 for details)
•Hand-held browsing for general purpose
troubleshooting of a circuit board
•Adjustable probe tips for different circuit
geometries
21 GHz 0.20 pF 0.34 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
•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
20 GHz N/A N/A

Available Probe Heads and Accessories - Overview 2
InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 17
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
•Recommended for DDR4, DDR5, LPDDR4,
MIPI D-Phy 2.0 and C-Phy 2.0
With N5426A ZIF Tip
18 GHz 0.33 pF 0.53 pF
N2884A Fine Wire ZIF Tip
18 GHz 0.35 pF N/A
6. N5381B Differential Solder-in Probe Head (refer to 1168/9B-Series Probes user’s guide)
•Solder-in hands free connection
•Recommended for DDR4, DDR5, LPDDR4,
MIPI D-Phy 2.0
12 GHz 0.21 pF 0.35 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
•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.
12 GHz N/A N/A
Table 2 Supported Probe Heads (Sheet 2 of 3)
Probe Head (listed in the order of BW) Recommended Usage Bandwidtha
Cdiff b
(pF)
Cse c
(pF)

18 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide
2Available Probe Heads and Accessories - Overview
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
•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
With 7mm N5451A ZIF Tip
~9.9 GHz
(0º tip span)
~4.4 GHz
(60º tip span)
0.6 pF 0.58 pF
With 11mm N5451A ZIF Tip
~5 GHz
(0º tip span)
~3.3 GHz
(60º tip span)
0.68 pF 0.68 pF
9. E2677B Differential Solder-in Probe Head (refer to 1168/9B-Series Probes user’s guide)
•Hands-free solder-in connection 12 GHz 0.27 pF 0.44 pF
10. E2678B Differential Socketed Probe Head (refer to 1168/9B-Series Probes user’s guide)
•Measuring signal via a plug-on socket
connection
•Removable connection using solder-in
resistor pins for hard to reach targets
12 GHz 0.34 pF 0.56 pF
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
6 GHz 0.32 pF 0.57 pF
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
Table 2 Supported Probe Heads (Sheet 3 of 3)
Probe Head (listed in the order of BW) Recommended Usage Bandwidtha
Cdiff b
(pF)
Cse c
(pF)

Available Probe Heads and Accessories - Overview 2
InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide 19
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 5oC to 40oC and cannot be
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.
Refer to the topic “Extreme Temperature Probing" on page 139 to know more.
Table 3 N5450B Kit Contents
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.
Figure 3 Attenuators Between a Probe Amplifier and a Probe Head
Item Qty Supplied Description
Phase-matched RF
Cables
2 To ensure a high-quality measurement, the N5450B
cable set have been phase-matched at the factory.
Coupling Tag 1 A coupling tag is included with the cables to ensure
that the cables stay as a matched pair.
Attenuator

20 InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide
2Available Probe Heads and Accessories - Overview
Table 4 N2880A Kit Contents
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.
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).
Item Qty Supplied Description
6 dB Attenuators 2 These attenuators come as matched pairs and should only be
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).
12 dB Attenuators 2
20 dB Attenuators 2
DC Blocking Capacitor