Keysight N5445A InfiniiMax III, N2848A InfiniiMax III+, N5439A InfiniiMax III, N2836A InfiniiMax III, N5441A InfiniiMax III User Manual

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Keysight N2800A Series Differential InfiniiMax III Probes

User’s Guide

Page 2

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

N2800-97020

Edition

May 2017 Published in USA Published by: Keysight Technologies, Inc. 1400 Fountaingrove Parkway Santa Rosa, CA 95403 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.

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.

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.

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1 Using InfiniiMax III Series Probes

2 InfiniiMax III Probe Heads

3 Maintaining Probe Heads

InfiniiMax III Probe Amplifiers 6 InfiniiMax III and III+ Probing System Family Diagram 9 Proper Handling Techniques 11 N5477A Sampling Scope Adapter 16 Cautions 17

N5445A InfiniiMax III Differential Browser Probe Head 20 N2848A InfiniiMax III+ QuickTip InfiniiMode Probe Head 25 N5439A InfiniiMax III ZIF Probe Head 29 N2836A InfiniiMax III Solder-in Probe Head 35 N5441A InfiniiMax III Solder-in Probe Head 39 N5444A InfiniiMax III 2.92 mm / 3.5 mm / SMA Probe Head 42 N2835A InfiniiMax III Differential Connectivity Kit and Accessories 44 Strain Relieving the Probe Heads 46

Replacing Axial Resistor Tips 50 Replacing N5441A Probe Head Wires 53

4 Performance Specifications / Characteristics

Specifications and Characteristics 58 InfiniiMax III Probe Heads Dimensions 65

5 Calibration / Deskew Procedure

Procedure 70

6 Performance Verification

Bandwidth Performance Verification 78 DC Input Resistance Performance Verification 96 Performance Test Record 99

7Performance Plots

N2836A 26 GHz Solder-In Head (with N2803A) 103 N2838A/N5439A 25 GHz PCB ZIF Tip/Head (with N2803A) 106 N5440A/N5439A 28 GHz Ceramic ZIF Tip/Head (with N2803A) 109 N5447A/N5439A 28 GHz Ceramic High-Sensitivity ZIF Tip/Head (with N2803A) 112 N5441A 16 GHz Solder-In Head (with N2803A) 115

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N5444A 30 GHz SMA 2.92 mm Head (with N2803A) 118 N5445A 30 GHz Browser Head, 1 mm span (with N2803A) 121 N5445A 30 GHz Browser Head, 2 mm span (with N2803A) 124 N5445A 30 GHz Browser Head, 3 mm span (with N2803A) 127

8SPICE Models

SPICE Models for N5440/1/4/5/7A Probe Heads 130 SPICE Models for N2838A and N2836A Probe Head 136 Simplified InfiniiMax III Schematic 139

4 InfiniiMax III Series Probes

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Keysight InfiniiMax III Series Probes

CAUTION

User’s Guide

1 Using InfiniiMax III Series

Probes

InfiniiMax III Probe Amplifiers 6 InfiniiMax III and III+ Probing System Family Diagram 9 Proper Handling Techniques 11 N5477A Sampling Scope Adapter 16 Cautions 17

This chapter contains documentation on using the InfiniiMax III probing system.

The InfiniiMax III probing system offers you the highest performance available for measuring differential and single-ended signals, with flexible connectivity solutions for today’s high-density ICs and circuit boards. Four different InfiniiMax III probe amplifiers ranging from 16 GHz to 30 GHz are available for matching your probing solution to your performance and budget requirements. A proprietary 200 GHz fT InP (indium phosphide) IC process with backside ground vias and novel thick film technology is utilized to accommodate your highest performance needs.

The family diagram for the InfiniiMax III probing system is shown in “InfiniiMax III and III+

Probing System Family Diagram" on page 9. This system is designed to give you the

maximum flexibility in matching your probe to your setup. The following pages will discuss each of the adapters, probe amplifiers, and probe heads in detail.

Refer to “Proper Handling Techniques" on page 11 before connecting any probe to the oscilloscope.

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1 Using InfiniiMax III Series Probes

InfiniiMax III Probe Amplifiers

There are four InfiniiMax III amplifier models:

• N2800A 16 GHz Probe Amplifier

• N2801A 20 GHz Probe Amplifier

• N2802A 25 GHz Probe Amplifier

• N2803A 30 GHz Probe Amplifier

Each probe amplifier is pre-loaded with its specific measured S-parameters. When used with the Infiniium 90000 X-series, the oscilloscope downloads these parameters and automatically corrects the response of the unique probe system.

Figure 1 InfiniiMax III Probe Amplifier

Menu Button

Press this button to bring up the Probe dialog box in the oscilloscope GUI.

Light Button

Press this button to turn the LED headlights on the browser probe head on/off. Pressing and holding this button will ramp the intensity of the LED headlights. You may want to adjust the brightness to accommodate different lighting or glare conditions.

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Sensitivity Indicator

CAUTION

If you are using the ZIF probe head, the sensitivity indicator tells you which ZIF tip is connected to the probe head. If the N5447A ceramic high sensitivity ZIF tip is connected then the “Hi” sensitivity LED will be illuminated. If the N5440A ceramic ZIF tip is connected then the “Normal” sensitivity LED will be illuminated. This will assist you in ensuring that the correct ZIF tip is selected in the oscilloscope GUI’s probe dialog box.

If you select the wrong pairing of ZIF probe head and ZIF probe tip in the oscilloscope GUI’s probe menu, your waveforms will look incorrect.

DC Calibration Indicator

Indicates if the particular combination of probe amplifier, probe head, and oscilloscope channel input is calibrated. Any time you use a new probe head type, a new probe amplifier, or a different channel on the oscilloscope, the DC Cal indicator turns amber, indicating that a DC calibration is required. After performing a calibration as described in

Chapter 5, “Calibration / Deskew Procedure”, the DC Cal indicator turns green.

Using InfiniiMax III Series Probes 1

Channel Identification Rings

Use the channel-identification rings to match each probe to the color of the oscilloscope’s input channel to which it is connected. This enables you to quickly know which probe is connected to each channel without having to trace cables back to the oscilloscope inputs.

Channel Connection

Refer to “Proper Handling Techniques" on page 11 before connecting any probe to the oscilloscope.

The connector labeled A in Figure 1 on page 6 plugs into one of the oscilloscope channel inputs. If connecting it directly to an Infiniium 90000 X-series oscilloscope, plug it into the channel and then turn the gray clutch/dial around the input (Figure 2 on page 8) until it clicks. To disconnect the probe amplifier, loosen the clutch on the oscilloscope input and disconnect the probe amplifier. If you are using an InfiniiMax III probe amplifier with Keysight’s 86100D sampling oscilloscope, you will need to use the N5477A sampling scope adapter.

The connector labeled B in Figure 1 on page 6 connects to one of the InfiniiMax III probe heads.

InfiniiMax I and II probe heads are not compatible with the InfiniiMax III probe amplifiers and vice versa.

InfiniiMax III Series Probes User’s Guide 7

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1 Using InfiniiMax III Series Probes

NOTE

Figure 2 Clutches on an Infiniium 90000 X-series oscilloscope

The clutches on the Infiniium 90000 X-series do not require a mechanical calibration. They will maintain the same tolerance as the Keysight torque wrench (8 in lbs ±1 in lbs).

Probe Amplifier Bandwidth Upgrades

The InfiniiMax III probe amplifiers are upgradeable. When you order a probe bandwidth upgrade, you receive a new probe with a new model number and new serial number. The bandwidth upgrades are:

• N5446A-001 16 GHz to 20 GHz bandwidth upgrade

• N5446A-002 20 GHz to 25 GHz bandwidth upgrade

• N5446A-003 25 GHz to 30 GHz bandwidth upgrade

• N5446A-004 16 GHz to 25 GHz bandwidth upgrade

• N5446A-005 16 GHz to 30 GHz bandwidth upgrade

• N5446A-006 20 GHz to 30 GHz bandwidth upgrade

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Using InfiniiMax III Series Probes 1

InfiniiMax III and III+ Probing System Family Diagram

The following diagram shows the InfiniiMax III and InfiniiMax III+ probes and probe heads. The diagram is not drawn to scale.

Figure 3 InfiniiMax III / III+ Probing System

InfiniiMax III Series Probes User’s Guide 9

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1 Using InfiniiMax III Series Probes

CAUTION

NOTE

For extreme temperature testing, use the N5450B InfiniiMax extreme temperature extension cable with the N5441A solder-in head. The N5441A can withstand temperatures from –55°C to +150°C for up to 250 test cycles.

None of the N2800/1/2/3A probe amplifiers can withstand the extreme temperatures (–55°C to +150°C) that the N5450B can withstand. When using the N5450B extension cable, do not subject the InfiniiMax III probe amplifier to extreme temperatures.

None of the other probe heads are designed for extreme temperature testing.

The N5449A includes one N2873A probe. The adapter is specifically tuned for the N2873A probe. Similar probes (1 ΜΩ input) can be used. Other probes may not meet the bandwidth specification.

When using the N5450B extension cable, do not subject the InfiniiMax III probe amplifier or probe head (other than the N5441A solder-in probe head) to extreme temperatures.

N2849A QuickTips are also compatible with N2851A QuickTip Probe Heads, which are designed for 1130/1/2/4A InfiniiMax I and 1168/9A InfiniiMax II probes.

Use the N5443A Performance Verification (PV) accessory fixture to properly position the probe for PV testing.

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Proper Handling Techniques

CAUTION

This guide will assist you in properly handling your InfiniiMax III N2800A-series probes to prevent damage and maintain high performance. For more safe-handling information, go to www.keysight.com/find/scope-demo, click on See Keysight's probes in action, and then InfiniiMax III ESD Best Practices demo video listed under the Document Library tab.

Electrostatic discharge (ESD) can quickly and imperceptibly damage or destroy high-performance probes, resulting in costly repairs. Always wear a wrist strap when handling probe components.

Probes are sensitive devices and should be treated with care. Do not bend or kink the probe amplifier cable. 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.

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.

Using InfiniiMax III Series Probes 1

InfiniiMax I and II probe heads cannot be used with InfiniiMax III probe amplifiers and InfiniiMax III probe heads cannot be used with InfiniiMax I and II amplifiers.

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

Always disconnect an N5441A solder-in probe head from the probe amplifier before unsoldering, moving to a new position, and re-soldering the head.

Before Connecting a Probe

InfiniiMax probes and accessories are ESD sensitive devices and should be treated with care. Before using or handling the probe or accessories, 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 Figure 4 on page 12.

InfiniiMax III Series Probes User’s Guide 11

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1 Using InfiniiMax III Series Probes

Figure 4 Static-Safe Work Station

Many scopes including Keysight's 90000X series have a front-panel ground socket. You can plug the wrist strap into the ground socket as seen in the following picture.

Figure 5 Wrist Strap Connected to Oscilloscope Ground Socket

The static-safe work station shown in Figure 4 uses two types of ESD protection:

• Conductive table-mat and wrist-strap combination.

• Conductive floor-mat and heel-strap combination.

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

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WARNING

These techniques for a static-safe work station should not be used when working on

CAUTION

circuitry with a voltage potential greater than 500 volts.

Connecting a Probe to an Oscilloscope Channel

To protect against ESD damage, always use the following steps when connecting your probe to the oscilloscope.

1 If the Device Under Test (DUT) is not grounded to the oscilloscope via the AC mains

ground, connect the DUT ground to the oscilloscope ground. An example of a device having a floating ground would be a battery-powered DUT.

2 Attach the probe head to the DUT.

At this point, the N2800A-series probe amplifier must not be connected to the oscilloscope or the probe head.

Using InfiniiMax III Series Probes 1

Figure 6 Probe Head Attached to DUT

3 Connect the probe amplifier to the oscilloscope while hand tightening the dark gray clutch

ring. The clutch ring limits the applied torque to 8 in-lb (±1 in-lb).

Figure 7 Probe Amplifier Connected to Oscilloscope

4 Connect the probe head to the probe amplifier.

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1 Using InfiniiMax III Series Probes

CAUTION

When connecting a probe head to a probe amplifier, push straight in. 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 the probe head itself.

Figure 8 Probe Head Connected to Probe Amplifier

Disconnecting a Probe from an Oscilloscope Channel

Always disconnect the probe head from the probe amplifier before:

• disconnecting the probe amplifier from the oscilloscope.

• switching the probe amplifier from one oscilloscope channel to another.

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

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Using InfiniiMax III Series Probes 1

CAUTION

Figure 9 Probe Improperly Disconnected from Oscilloscope while Probe Head is Connected

to the Probe Amplifier

Probing the DUT

When making your measurements, you’ll often need to probe different locations on the DUT. You can safely move any of the following three probe heads without having to first break the amplifier-to-head connection:

• N5445A differential browser head

• N5439A ZIF head

• N5444A 2.92 mm/3.5 mm/SMA head

The only exception is when the DUT is not grounded to the oscilloscope via the AC mains ground. In this case, connect the DUT ground to the oscilloscope ground before moving the probe. An example of a device having a floating ground would be a battery-powered DUT.

When probing with an N5441A solder-in probe head, always disconnect the probe head from the amplifier before moving the head to a new probing point. This is because some soldering-iron tips can hold a charge which can damage the probe amplifier.

Always disconnect an N5441A solder-in probe head from the probe amplifier before un-soldering, moving to a new position, and re-soldering the head.

InfiniiMax III Series Probes User’s Guide 15

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1 Using InfiniiMax III Series Probes

N5477A Sampling Scope Adapter

The N5477A Sampling Scope Adapter allows you to connect the InfiniiMax III probing system to the Infiniium 86100D DCA-X sampling oscilloscope or other RF instruments.

Figure 10 N5477A InfiniiMax III Sampling Scope Adapter

Connect the NMD/3.5 mm side of the adapter to one of the channel inputs on the sampling oscilloscope. Then connect the power cord to either the probe power output on the DCA-X 86100D wideband oscilloscope (if the module being used has this receptacle) or to the 1143A power module. Finally, connect the other side of the adapter to the InfiniiMax III probe amplifier.

Previously, the DCA-X wideband oscilloscope was limited to 13 GHz of probing, but with the N5477A sampling oscilloscope adapter, the DCA-X can now probe up to 30 GHz.

The N5477A sampling oscilloscope adapter can also be used to connect the InfiniiMax III probing system to generic 50 Ohm test equipment as long as the 1143A power supply and 5062-1247 NMD male-to-3.5mm female adapter are used. Both of these parts can be ordered through Keysight Technologies.

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Cautions

CAUTION

Using InfiniiMax III Series Probes 1

In addition to the CAUTION notices below, also refer to the CAUTION notices listed in each section of this book.

Electrostatic discharge (ESD) can quickly and imperceptibly damage or destroy high-performance probes, resulting in costly repairs. Always wear a wrist strap when handling probe components.

Whenever you disconnect a probe head from an InfiniiMax amplifier, pull the probe head connectors straight out of the sockets. When connecting a probe head to an amplifier, push straight in also. Never bend the probe head in order to “pop” 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 the probe head itself.

InfiniiMax I and II probe heads cannot be used with InfiniiMax III probe amplifiers and InfiniiMax III probe heads cannot be used with InfiniiMax I and II amplifiers.

Always remove the probe head from the device under test (DUT) before disconnecting the probe amp from the oscilloscope.

InfiniiMax III Series Probes User’s Guide 17

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1 Using InfiniiMax III Series Probes

18 InfiniiMax III Series Probes User’s Guide

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Keysight InfiniiMax III Series Probes

CAUTION

User’s Guide

2 InfiniiMax III Probe Heads

This chapter documents the InfiniiMax III probe heads.

Refer to “Proper Handling Techniques" on page 11 before connecting any probe head to a probe amplifier.

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2 InfiniiMax III Probe Heads

NOTE

N5445A InfiniiMax III Differential Browser Probe Head

The N5445A browser head (30 GHz) is the best choice for the general-purpose trouble shooting of differential signals with spring-loaded tips and variable spacing from 20 mil to 125 mil (or

0.5 mm to 3.1 mm).

The span between the signal tips is easily adjusted with a thumb wheel on the browser (see Figure 11).

For performance plots, refer to Chapter 7, “Performance Plots.

Figure 11 N5445A InfiniiMax III Differential Browser Head

Using the LED Headlights

A pair of LED headlights are integrated into the tip of the browser to illuminate the probing area for better visibility. The headlights are controlled via the Light button on the InfiniiMax III probe amplifier (see Figure 1 on page 6). Pressing this button turns the headlights on / off while pressing the button and holding it down ramps the intensity of the headlights.

Adjusting the Tip Span

Turn the browser’s thumb wheel (see Figure 12) to adjust the tip spacing from 20 to 125 mil (0.5 mm to 3.1 mm). Do not force the adjustment near the end of its range.

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Figure 12 Adjusting the Tip Span

Tip-Span Entry for Probe Calibration

InfiniiMax III Probe Heads 2

When calibrating the probe, you will be prompted to enter the span setting on the oscilloscope’s Probe Calibration dialog box. To determine the tip span, do the following steps:

1 Adjust the browser’s tip span for your measurement.

2 Locate the tip-span gauge on the browser’s protective cap as shown in Figure 13.

3 Determine which of the three possible tip-span settings most closely matches the

browser’s tip span.

Figure 13 Tip Span Gauge on Browser Protective Cap

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2 InfiniiMax III Probe Heads

CAUTION

Mounting the Browser

There are two holes on the back side of the browser. Use these holes to mount the browser to a customer designed holder. Figure 14 below shows the dimensions of these mounting holes.

Figure 14 Dimensions of Mounting Holes

Probe Along the Browser’s Axis

To prevent tip damage, probe along the browser’s axis as shown in Figure 15. Hold the probe vertical and perpendicular to the circuit board.

Figure 15 Proper Probe Handling

To avoid damaging the browser’s tips, do not apply a side load to the browser.

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InfiniiMax III Probe Heads 2

CAUTION

Figure 16 Improper Probe Handling

Do not apply too much force when browsing. The weight of the probe in your hand should be sufficient. The axial travel of the probe is about 15 mils (0.4 mm).

The browser’s protective cap should be kept on the browser at all times except when probing.

Always remove the browser from the device under test (DUT) before disconnecting the probe amp from the oscilloscope.

Replaceable Parts

Figure 17 shows the replaceable parts for th N5445A.

Figure 17 Browser Tips and Ground Blade

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2 InfiniiMax III Probe Heads

Table 1 N5445A Replaceable Parts

Description Qty Part Number

Browser tips 4 N5476A

Ground Blade 1 N4855A

Ground Blade Screws 1 N4856A

N2787A 3D Probe Positioner

Using the N2787A 3D probe positioner with the N5445A browser probe head reduces the chance of breaking the browser tips and ensures that the tips maintain solid contact. Use the following steps to position the probe using the N2787A:

1 Lock the vertical compliance of the probe positioner.

2 Clamp the browser into the positioner, aligning the browser’s slot with the positioner’s

gripping pad.

3 While holding the browser, loosen the main knob and position the probe.

4 Use the browser’s own weight to depress the tips, and tighten the main knob to lock the

probe’s position.

Figure 18 Using the Browser with the N2787A 3D Probe Positioner

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InfiniiMax III Probe Heads 2

NOTE

N2848A InfiniiMax III+ QuickTip InfiniiMode Probe Head

The N2848A QuickTip probe head is used with an N2849A QuickTip and together they provide the following advantages:

• Easy-to-make secure magnetic mechanical connection between probe head and QuickTip as shown in Figure 19. No latch lever is used!

• Extreme temperature environments such as temperature chambers.

Figure 19 Magnet Connections in Probe Head

When used with N2830A-series probe amplifiers, the N2848A is InfiniiMode compatible. InfiniiMode allows you to make differential, common mode, and single ended measurements without having to re-solder the tip leads. InfiniiMode is not available when using with N2800A-series probe amplifiers.

Table 2 N2848A with N2804A Probe Amplifier

Item Characteristic

Bandwidth 16 GHz

Input C (Differential) 340 fF

Input C (Single Ended 200 fF

Rise Time 27.1 ps (10 - 90%)

Fall Time 19.3 ps (20 - 80%)

Permanently solder any number of N2849A QuickTips to your DUT as shown in Figure 20 on page 26. Because the probe head is magnetically connected (instead of mechanically connected) to the QuickTip, you can effortlessly connect and disconnect to each QuickTip. For best performance, position the QuickTip vertically on the DUT. The N2849A QuickTip has two signal leads and two ground leads. The ground leads have minimal effect on your differential measurements. However, if you are making only differential measurements you

InfiniiMax III Series Probes User’s Guide 25

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2 InfiniiMax III Probe Heads

CAUTION

NOTE

can optionally cut off the ground leads or fold them out of the way. Be aware that without the ground leads, the mechanical stability of the QuickTip will be reduced and you will need to stabilize the probe head.

Figure 20 Probing with the N2848A Probe Head and N2849A QuickTip

Do not replace or repair the N2849A QuickTip’s resistor or ground leads. Attempting to do so will damage the ability of the tip to mate with the N2848A probe head.

The N2848A does not include any N2849A QuickTips. The N2849A must be ordered separately.

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N2849A QuickTips are also compatible with N2851A QuickTip InfiniiMode Probe Heads,

CAUTION

NOTE

which are designed for 1130/1/2/4A InfiniiMax I and 1168/9A InfiniiMax II probes.

Connecting a QuickTip to the DUT

Use the following tips when soldering the QuickTips to your DUT:

• Orient the QuickTip vertically as shown in Figure 20 on page 26.

• Solder the four leads to vias or surfaces.

• When soldering to a via, always trim the lead close to the via’s underside.

• If a lead is to be soldered to a surface and not a via, make a stronger solder joint by bending the end of the lead 90°. For signal leads, bend the wire approximately half way between the resistor and the end of the wire. Bend the ground leads at about the same distance.

Always mechanically strain-relieve the QuickTip head before using to protect both your probe accessories and DUT from damage.

Be careful not to damage the tip wires when handling the QuickTips. Wires can be carefully reshaped with tweezers or fingers if necessary.

InfiniiMax III Probe Heads 2

The QuickTips are very fragile. They must be manufactured in this way in order to meet the high-performance, high bandwidth applications they are intended for. Be extremely careful when handling.

Resistor and wire leads on the QuickTip are factory trimmed to the proper length for use. Adding wire length to the tip of the mini-axial lead resistors or to the ground leads will degrade the performance of the probe.

Soldering the ground wires is not required when making differential or single-ended (+ or – leads) measurements.

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2 InfiniiMax III Probe Heads

Cleaning the Magnetic Connections

If the three magnetic connections in the head become dirty, clean the connections using the following steps:

1 Use compressed air or a cloth to remove any loose dirt.

2 Gently rub a small piece of tack putty (supplied with the probe) against the magnetic

connections to clean off any remaining surface grime.

Figure 21 N2848A Head Before and After Cleaning

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InfiniiMax III Probe Heads 2

NOTE

N5439A InfiniiMax III ZIF Probe Head

The N5439A Zero Insertion Force (ZIF) probe head provides 28 GHz bandwidth. The head supports three types of economical replaceable tips which are shown in

Table 3. Solder as many tips onto your DUT 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.

For information on mechanically securing the probes to protect your equipment and designs from damage, refer to “Strain Relieving the Probe

Heads" on page 46.

Table 3 Available ZIF Tips

ZIF Tip Description Variable Tip Spacing Qty

N2838A 25 GHz 450W PC board tip provides robust design with

high bandwidth.

N5440A 28 GHz 450W ceramic

(normal sensitivity) for extremely low probe loading.

N5447A 28 GHz 450W ceramic

high-sensitivity for extremely low probe loading.

The N5439A does not include any ZIF tips. You must order either the N2838A, N5440A, or N5447A in addition to N5439A.

5 mil to 250 mil (0.127 mm to 6.35 mm).

5 mil to 80 mil (0.127 mm to 2 mm).

To install or repair the N2838A resistor leads, refer to “Replacing Axial Resistor

Tips" on page 50.

For performance plots, refer to Chapter 7, “Performance Plots.

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2 InfiniiMax III Probe Heads

CAUTION

Ensuring Maximum N2838A Tip Performance

The specifications and performance plots of the N2838A ZIF tip were measured with a nominal spacing of 40 mil (1 mm). In order to achieve the proper response as shown in the performance plots, keep the mini-axial lead resistors roughly parallel as shown in Figure 22, and use the tip wires on the mini-axial leads to get the desired span.

If you need to position the resistors different than shown in this figure (that is, resistor bodies close together or spread apart), use Keysight’s N2807A and N2808A PrecisionProbe products to perform an AC calibration of the probe, which properly captures the response. Increasing the spacing to 250 mil degrades the performance some, but PrecisionProbe can be used to compensate or qualify the effect.

Figure 22 Proper Position of Resistors

Soldering a ZIF Tip to the DUT

The ZIF tips are very fragile. They must be manufactured in this way in order to meet the high-performance, high bandwidth applications they are intended for. Be extremely careful when handling.

30 InfiniiMax III Series Probes User’s Guide

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InfiniiMax III Probe Heads 2

NOTE

CAUTION

1 Break off a ZIF tip/handle combination from the packaging holder at the point shown in the

figure.

Figure 23 Five ZIF Tips on Packaging

2 Flux and tin the leads on the target DUT.

Figure 24 Preparing the DUT Leads

3 While holding the plastic form, form the ZIF tip wires to match the DUT’s pitch and angle.

4 Flux the ZIF tip wires and DUT leads.

5 Position the ZIF tip with the gold traces facing up as shown in Figure 25 and carefully

re-flow the solder. This orients the tip so that it will properly mate with the probe head.

When soldering the tip to your DUT, use the tip handle to hold the tip. This allows you to position these small tips without damaging them.

Do not dwell on this solder joint.

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2 InfiniiMax III Probe Heads

CAUTION

Figure 25 Soldering the ZIF Tip

6 Pull the ZIF handle from the ZIF tip in the direction shown in Figure 26. ZIF tips can be

carefully handled with your fingertips and reinserted into a plastic handle if necessary.

Figure 26 Removing the Handle from the ZIF Tip

7 You can connect ZIF tips to any of the locations on a DUT that you need to probe. The

probe head can be quickly moved between the tips.

Always mechanically strain-relieve the ZIF head before using to protect both your probe accessories and DUT from damage. Refer to “Strain Relieving the Probe Heads" on page 46.

Be careful not to damage the tip wires when handling the ZIF tips. Wires can be carefully reshaped with tweezers or fingers if necessary.

Connecting the Probe Head to the ZIF Tip

1 Add strain relieve for the ZIF probe head as described in “Strain Relieving the Probe

Heads" on page 46.

2 Form the coaxial cables to bring the probe head near the tip. Press the lever down on the

ZIF probe head (see Figure 27) and slide the probe head onto the tip. Pressing on this lever removes the clamping force of the connector and enables you to insert or remove ZIF tips.

Stop if you encounter any resistance at all when sliding the probe head over the ZIF tip. Check your alignment, make sure the lever is pressed, and try again. Inserting the ZIF tip should require “zero” insertion force.

32 InfiniiMax III Series Probes User’s Guide

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CAUTION

Always use the lever when inserting or removing ZIF tips.

NOTE

Figure 27 Probe Head with Location of the Lever

InfiniiMax III Probe Heads 2

Figure 28 Probe Head Connected to a Soldered ZIF Tip

For more repeatable results, orient the probe connection perpendicular to the device as shown in

Figure 29.

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2 InfiniiMax III Probe Heads

NOTE

Figure 29 Probe Oriented Perpendicular to Device

3 To move the probe head to a different tip, press the lever and remove the probe head from

the ZIF tip. The ZIF tip remains soldered to the DUT. Then, simply connect the ZIF head to another ZIF tip at a different location on the DUT.

You can use tweezers to actuate the lever in tight places.

34 InfiniiMax III Series Probes User’s Guide

Page 35

N2836A InfiniiMax III Solder-in Probe Head

NOTE

The N2836A InfiniiMax III solder-in probe head is an economical semi-permanent connection that provides up to 26 GHz of system bandwidth. The span of the leads can be adjusted from 5 mil - 250 mil (0.127 mm - 6.35 mm).

To use the head’s InfiniiMode capability, use this head with N2830A-series probe amplifiers. InfiniiMode allows you to make differential, common mode, and single ended measurements without having to re-solder the tip leads.

Figure 30 N2836A InfiniiMax III solder-in probe head

InfiniiMax III Probe Heads 2

For information on mechanically securing the probes to protect your equipment and designs from damage, refer to “Strain Relieving the Probe Heads" on page 46.

To install or repair the N2836A resistor leads, refer to “Replacing Axial Resistor

Tips" on page 50.

Figure 31 Probe Head Connection to DUT

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2 InfiniiMax III Probe Heads

CAUTION

Ensuring Maximum Performance

The specifications and performance plots of the N2836A probe head were measured with a nominal spacing of 40 mil (1 mm). In order to achieve the proper response as shown in the performance plots, keep the mini-axial lead resisto rs roughly parallel as shown in Figure 32, and use the tip wires on the mini-axial leads to get the desired span.

Figure 32 N2836A With 1 mm Tip Spacing

If you need to position the mini-axial lead resistors different than shown in this figure (that is, resistor bodies close together or spread way apart), use Keysight’s N2807A and N2808A PrecisionProbe products to perform an AC calibration of the probe. The AC calibration will capture the response properly. Increasing the spacing to 250 mil will degrade the performance some, but Precision Probe can be used to compensate or qualify the effect.

The axial resistors on the N2836A solder-in probe head are fragile. They must be manufactured in this way in order to meet the high-performance, high bandwidth applications they are intended for. Be careful when handling.

Soldering the Probe Head to the DUT

To solder the probe head to your DUT, complete the following steps. The procedure is very similar to that for the ZIF probe tips used with the N5439A probe head. This procedure does not show soldering the ground leads, but the same techniques are used.

1 Apply flux to your target leads as shown in Figure 33.

Figure 33 Applying Flux

2 Tin the leads with a small amount of solder.

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InfiniiMax III Probe Heads 2

CAUTION

Figure 34 Tin the Leads

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

4 Flux the DUT leads and your probe head wires.

Figure 35 Applying Flux to Leads and Wires

5 Position the probe head wires on the DUT leads and quickly re-flow the solder as shown in

Figure 36.

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

Figure 36 Positioning Wires

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2 InfiniiMax III Probe Heads

38 InfiniiMax III Series Probes User’s Guide

Page 39

N5441A InfiniiMax III Solder-in Probe Head

CAUTION

NOTE

The N5441A InfiniiMax III solder-in probe head is an economical semi-permanent connection that provides up to 16 GHz of system bandwidth. The span of the leads can be adjusted from 5 mil - 80 mil (0.127 mm - 2 mm).

The N5441A probe head can be used with the N5450B InfiniiMax extreme temperature extension cable. This is the only InfiniiMax III probe head that can withstand the –55°C to +150°C extreme temperature range (for up to 250 test cycles).

When using the N5450B extension cable, do not subject the InfiniiMax III probe amplifier or probe head (other than the N5441A solder-in probe head) to extreme temperatures.

InfiniiMax III Probe Heads 2

Figure 37 N5441A InfiniiMax III solder-in probe head

The wires on the N5441A are fragile. They must be manufactured in this way in order to meet the high-performance, high bandwidth applications they are intended for. Be careful when handling.

For information on mechanically securing the probes to protect your equipment and designs from damage, refer to “Strain Relieving the Probe Heads" on page 46.

To install or repair the tip wires on the N5441A, refer to “Replacing N5441A Probe

Head Wires" on page 53.

Soldering the Probe Head to the DUT

To solder the probe head to your DUT, complete the following steps. The procedure is very similar to that for the ZIF probe tips used with the N5439A probe head.

1 Position the probe head near the location on the DUT where you want to solder the probe.

2 Add strain relieve for the probe head as described in “Strain Relieving the Probe

Heads" on page 46.

3 Apply flux to your target leads as shown in Figure 38.

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2 InfiniiMax III Probe Heads

CAUTION

Figure 38 Applying Flux

4 Tin the leads with a small amount of solder.

Figure 39 Tin the Leads

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

6 Flux the DUT leads and your probe head wires.

Figure 40 Applying Flux to Leads and Wires

7 Position the probe head wires on the DUT leads and quickly re-flow the solder as shown in

Figure 41.

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

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Figure 41 Positioning Wires

InfiniiMax III Probe Heads 2

InfiniiMax III Series Probes User’s Guide 41

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2 InfiniiMax III Probe Heads

N5444A InfiniiMax III 2.92 mm / 3.5 mm / SMA Probe Head

The N5444A InfiniiMax III 2.92 mm/3.5 mm/SMA probe head provides 30 GHz bandwidth and allows you to connect two 2.92 mm, 3.5 mm, or SMA cables to make a differential measurement on a single oscilloscope channel.

The N5444A provides for a termination to a common DC voltage rather than to ground, which is required for many signal standards. It is implemented such that from DC to approximately 1 kHz, the termination is 55 Ohms to the termination voltage, and above approximately 10 kHz, the termination is 50 Ohms to 0.9 times the termination voltage. The termination voltage range is ±4V with a minimum step of 5 mV and a maximum current of 80 mA. The termination voltage can be controlled internally by the oscilloscope or applied externally using the supplied DC jack.

Figure 42 N5444A InfiniiMax III 2.92mm/3.5mm/SMA Probe Head

N5448B Coaxial Phase Matched Cable Pair

For extending the cable length of the N5444A InfiniiMax III probe head and add flexibility and convenience to the probing setup, you can order N5448B 10 inches (25 cm) long coaxial phase matched cable pair. This cable pair supports 2.92 mm male-to-2.92 mm male connection.

Figure 43 N5448B Coaxial Phase Matched Cable Pair

Before connecting these cables to the N5444A probe head, you must first remove the supplied rigid cables of the N5444A probe head. Figure 44 on page 43 shows the N5448B cables attached to the N5444A probe head.

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Figure 44 N5444A Probe Head With N5448B Cables Attached

CAUTION

InfiniiMax III Probe Heads 2

The maximum bend radius for the N5448B coaxial cable pair 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.

Also, ensure that the plastic caps that are provided with these cables are installed when the cables are not in use.

For details on the N5448B cable, refer to its guide available in the Document Library tab of this product’s page on www.keysight.com.

Probe Offset Calibration with the N5444A

To achieve more accurate probe offset calibration with the N5444A, an SMA shorting adapter (Keysight part number: 1250-3999) is required. This adapter is provided with the N5444A (with unit serial number US50072545 or higher) and should be connected to the N5444A's "—" input connector during the calibration. The latest Infiniium firmware includes instructions on the Probe Calibration dialog box to remind you to install the adapter. If the Infiniium oscilloscope's firmware is older than version 5.50.33, you can still attach the adapter and the resulting calibration will be valid.

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2 InfiniiMax III Probe Heads

N2835A InfiniiMax III Differential Connectivity Kit and Accessories

In addition to the individual probe heads described in the previous topics, the N2835A differential connectivity kit is also available for the InfiniiMax III probes.

This kit provides multiple quantities of the four InfiniiMax III probe heads as shown in Figure 45. You can order this kit either at the same time as InfiniiMax III probe amplifiers or separately later.

Figure 45 Probe Heads Included in the N2835A Differential Connectivity Kit (not to scale)

Table 4 Supplied Accessories (Sheet 1 of 2)

Qty

Description

N2836A InfiniiMax III 26 GHz Differential Solder-In Probe Head

Replacement Axial Resistors Kit 10 N2836-68701

N5439A InfiniiMax III 28 GHz Differential ZIF Solder-in Probe Head

N2838A InfiniiMax III 25 GHz ZIF Tip Kit 2 kits (5 tips in

N2848A InfiniiMax III QuickTip Probe Head 2 N2848A

N2849A InfiniiMax QuickTip Tips Kit 2 kits (4 tips in

N5445A InfiniiMax III Browser Probe Head 1 N5445A

Replacement Tips Tweezer for replacing tips Screw Driver Protective End Cap

Supplied

2 N2836A

2 N5439A

each kit)

4 1 1 1

Part Number

N2838A

N2849A

N5476A N5445-23801 N5445-23802 N5445-44101

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Table 4 Supplied Accessories (Sheet 2 of 2)

InfiniiMax III Probe Heads 2

Description

Qty Supplied

Ground Blades 4 N5445-68700

Part Number

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2 InfiniiMax III Probe Heads

Strain Relieving the Probe Heads

High-performance probes have small physical geometries to ensure the lowest possible loading and best electrical response. Because of their small size, probing accessories are often delicate. It is important to mechanically secure your probes to protect both your equipment and designs from damage. There are several methods that Keysight recommends:

Tack-putty

Keysight recommends the use of tack-putty for securing both probe heads and amplifiers. 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 neat your DUT.

A 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 46 Using tack-putty to strain relieve a probe head and amplifier

You can also use putty with a positioner, such as the Keysight N2787A. The same positioner can also be used to support your probe amplifier as shown in Figure 18 on page 24.

Figure 47 Using putty with the N2787A 3D Probe Positioner

46 InfiniiMax III Series Probes User’s Guide

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Low-temperature Hot Glue

CAUTION

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 48 Using low-temperature hot glue to secure a probe head

InfiniiMax III Probe Heads 2

General Tips on Strain Relief

Keep in mind that different accessories have different cable stiffness. You should choose a strain relief method appropriate for the cable stiffness. For instance, it is best to secure the stiffer N5439A near the SMP connectors and form the cable to the optimal location.

Other strain-relief options like tape or hook-and-loop work fine as well, but keep the following guidelines in mind to protect your probing investment.

Do not kink cables. Do not crush cables. Do not use aggressive adhesives or high temperatures.

Table 5 Replaceable Parts

Part Part Number

Extra wire (for solder-in probe head only) 01169-81301 (7 mil)

Strain Relief Putty N5439-65201

01169-21306 (5 mil)

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2 InfiniiMax III Probe Heads

48 InfiniiMax III Series Probes User’s Guide

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Keysight InfiniiMax III Series Probes

CAUTION

User’s Guide

3 Maintaining Probe Heads

Replacing Axial Resistor Tips 50 Replacing N5441A Probe Head Wires 53

Many probe heads come equipped with replaceable resistor or wire tips which can be replaced or repaired. Using the procedures in this chapter, you can extend the life of the following items:

• N2836A probe heads

• N5441A probe heads

• N2838A ZIF tips

Do not replace or repair the N2849A QuickTip’s resistor or ground leads. Attempting to do so will damage the ability of the tip to mate with the N2848A probe head.

Page 50

3 Maintaining Probe Heads

NOTE

CAUTION

Replacing Axial Resistor Tips

The procedure in this sections shows you how to replace the 130 ohm axial resistors that are located at the tip of the

• N2836A solder-in probe head and

• N2838A ZIF tip.

• These resistors can become worn or damaged with use. Order the replacement axial resistor kit (N2836-68701) which provides 10 resistors.

The pictures in the following procedure show the N2836A solder-in probe head, but the same procedure applies to the N2838A ZIF tip.

Recommended 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).

• Diagonal cutters.

• Magnifier or low power microscope.

•Ruler.

Procedure

1 As shown in Figure 49, clamp the probe head or ZIF tip in a vise. Tweezers can be used to

As the probe heads and tips are easily damaged, only experienced soldering technicians

should attempt this repair.

hold the probe head or ZIF tip away from the vise. When using tweezers, grip the tip either on the sides or top and bottom.

When tightening the vise, use light force to avoid damaging the solder-in probe head.

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Figure 49 Clamping the Part

NOTE

CAUTION

Maintaining Probe Heads 3

2 Grab each resistor lead or wire with tweezers and pull very gently up. Touch the soldering

iron to solder joint just long enough for the resistor to come free of the probe head tip.

Figure 50 Removing the Resistor

Clean the soldering iron tip of any excess solder before using.

The solder joint has very low thermal mass so the joint will quickly melt and release.

To limit burning and damage to the PC board, do not keep the soldering iron in contact with the tip any longer than is necessary.

Excessive dwell time with the iron will permanently damage the flip-chip resistor.

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3 Maintaining Probe Heads

CAUTION

NOTE

3 Use the soldering iron and solder to fill the holes in preparation for mounting the new

resistors (or wires).

Do not leave the iron in contact with the tip any longer than necessary.

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

5 Locate the trim gauge which is supplied with the N2836-68701 replacement axial resistor

kit.

Place a resistor over the lead length gauge shown in Figure 51. Trim the leads to match the drawing. The orientation of the lead is not important.

b Place a resistor over the bend gauge and bend the leads to match the

drawing. This bend fits in the hole in the tip’s PC board.

Figure 51 Trim Guage

6 Holding the resistor lead or wire in one hand and soldering iron in the other, position the

end of the resistor lead (after the 90 degree bend) over the solder filled hole.

Figure 52 Soldering in a new axial resistor

7 Touch the soldering iron to the side of the hole. When the solder in the hole melts, the

resistor lead will fall into the hole.

Remove the soldering iron as soon as the lead falls into the hole.

Because the thermal mass of the joint is very small, extra dwell time with the soldering iron is not needed to ensure a good joint.

8 Using a digital volt meter, measure the resistance from the coax center conductor to the

resistor tip. The DC resistance should measure 450 ohms.

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Replacing N5441A Probe Head Wires

CAUTION

Use the following procedure to install or replace the wire leads on the N5441A solder-in probe head. Depending on your probing application, you can order either 5 mil or 7 mil wire as listed in the following table. For example, use the 5 mil wire for attaching to small vias.

Table 6 Required Wire Type

Wire Diameter Part Number

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

0.005 inch (tin-plated nickel wires) 01169-21306

Table 7 Recommended Equipment

Equipment

Maintaining Probe Heads 3

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)

Procedure

1 Use the vise or clamp to position the tip an inch or so off the work surface for easy access.

If using a vise, grip the 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 tip either on the sides or at the top and bottom.

InfiniiMax III Series Probes User’s Guide 53

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3 Maintaining Probe Heads

CAUTION

Figure 53 Clamping the Probe Head

2 As shown in Figure 54, remove the old wires with tweezers while re-flowing the solder from

the underside of the probe.

Apply heat quickly to avoid damaging your probe.

Figure 54 Removing the Old Wire

3 If necessary, add a small amount of solder to the holes and apply flux.

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Maintaining Probe Heads 3

CAUTION

Figure 55 Adding Solder and Flux

4 Re-flow the solder from the underside and insert a new piece of wire. It is best to shape the

wire into an “L” before attempting to insert.

Do not dwell with the iron in contact with the probe head.

Figure 56 Adding a New Wire

Figure 57 New Wires Properly Attached

5 Trim any wire stubs on the probe head underside.

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3 Maintaining Probe Heads

Figure 58 Trim Wire Stubs

6 Use the included trim gauge to cut the wire lengths. Doing so ensures the best

performance from your probe head.

Figure 59 Trim Gauge Placed on Wires

Figure 60 Removing Excess Wire

7 Check the DC resistance of each probe leg when you have replaced the wires. The correct

resistance should be 450 ohms.

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Keysight InfiniiMax III Series Probes

User’s Guide

4 Performance Specifications /

Characteristics

The InfiniiMax III series probe amplifiers and probe heads are designed to be used within the temperature range of the 90000-X series oscilloscope. The only exception is the N5441A solder-in probe head. The N5441A solder-in probe head temperature range is from –55°C to +150°C for up to 250 test cycles. The N5441A is compatible with the N5450B InfiniiMax extreme temperature extension cable.

Page 58

4 Performance Specifications / Characteristics

Specifications and Characteristics

Table 8 Probe Amplifiers

Probe Amplifier BW tr

N2800A 16 GHz 27.1 ps

N2801A 20 GHz 21.7 ps

N2802A 25 GHz 17.4 ps

N2803A 30 GHz 14.3 ps

58 InfiniiMax III Series Probes User’s Guide

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Performance Specifications / Characteristics 4

Table 9 N2803A Amplifier with N2836A, N5441A, and N2848A Probe Heads (Sheet 1 of 2)

Specifications / Characteristics N2836A

Solder-In

Probe Bandwidth (–3 dB), Probe Only

Rise and Fall Time, Probe Only (Single-Ended)

Rise and Fall Time, Probe Only (Differential Mode)

System Bandwidth (–3 dB) with DSO/DSAX93204A

Rise and fall time with DSO/DSAX93204A

Input Capacitance Cdiff = 108 fF

DC Input Resistance* Rse = 50 kΩ ±2% each

27 GHz (typical) 17.2 GHz (typical) 16 GHz (typical)

21.1 ps (10-90%)

13.8 ps (20-80%)

16.1 ps (10-90%)

11.4 ps (20-80%)

26 GHz 16 GHz

16.5 ps (10-90%)

11.7 ps (20-80%)

Cse = 140 fF

input to ground Rdiff = 100 kΩ ±2% Rcm = 25 kΩ ±2%

N5441A Solder-In)

34.8 ps (10-90%)

26.6 ps (20-80%)

17.2 ps (10-90%)

26.6 ps (20-80%)

27.1 ps (10-90%)

19.2 ps (20-80%)

Cdiff = 77 fF Cse = 105 fF

Rse = 50 kΩ ±2% each input to ground

Rdiff = 100 kΩ ±2% Rcm = 25 kΩ ±2%

N2848A QuickTip Head with N2849A Tip

—

27.1 ps (10-90%)

19.3 ps (20-80%)

Cdiff = 340 fF Cse = 200 fF

Rse = 50 kΩ ±2% each input to ground

Rdiff = 100 kΩ ±2% Rcm = 25 kΩ ±2%

Input Resistance (> 10 kHz) Rse = 500Ω each input to

ground Rdiff = 1 kΩ

Rcm = 250Ω

Input Voltage Range (Differential or Single-Ended)

Input Common Mode Range ±12V DC to 250 Hz

DC attenuation Ratio 6:1 6:1 5:1 or 10:1

Offset Range (for probing a single-ended signal)

Input Referred Noise Spectral Density

Input Referred Noise Example 4 mVrms 4 mVrms

*Denotes warranted characteristic - all others are typical **Harmonic distortion < –38 dB is standard; < –34 dB wider input range with slightly increased distortion

1.6Vpp, ±0.8V (HD2&3< –38 dBc typ.),

2.5Vpp, ±1.25V (HD2&3< –34 dBc typ.) **

±1.25V > 250 Hz

±16V ±16V ±16V

23.9 nV/rt (Hz) 23.9 nV/rt (Hz) 23.9 nV/rt (Hz)

Rse = 500Ω each input to ground

Rdiff = 1 kΩ Rcm = 250Ω

1.6Vpp, ±0.8V (HD2&3< –38 dBc typ.),

2.5Vpp, ±1.25V (HD2&3< –34 dBc typ.) **

±12V DC to 250 Hz ±1.25V > 250 Hz

Rse = 500Ω ground

Rdiff = 1 kΩ Rcm = 250Ω

1.6Vpp, ±0.8V (HD2&3< –38 dBc typ.),

2.5Vpp, ±1.25V (HD2&3< –34 dBc typ.)**

±12V DC to 250 Hz ±1.25V > 250 Hz

each input to

InfiniiMax III Series Probes User’s Guide 59

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4 Performance Specifications / Characteristics

Table 9 N2803A Amplifier with N2836A, N5441A, and N2848A Probe Heads (Sheet 2 of 2)

Specifications / Characteristics N2836A

Solder-In

Maximum Input Voltage 18V peak CAT I 18V peak CAT I 18V peak CAT I

*Denotes warranted characteristic - all others are typical **Harmonic distortion < –38 dB is standard; < –34 dB wider input range with slightly increased distortion

N5441A Solder-In)

N2848A QuickTip Head with N2849A Tip

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Performance Specifications / Characteristics 4

Table 10 N2803A Amplifier with N2838A, N5447A, and N5440A ZIF Tips (Sheet 1 of 2)

Specifications / Characteristics N5439A ZIF Probe Head

N2838A PC Board ZIF Tip

Probe Bandwidth (–3 dB), Probe Only

Rise and Fall Time, Probe Only (Single-Ended)

Rise and Fall Time, Probe Only (Differential Mode)

System Bandwidth (–3 dB) with DSO/DSAX93204A

Rise and fall time with DSO/DSAX93204A

Input Capacitance Cdiff = 95 fF

DC Input Resistance* Rse = 50 kΩ ±2% each

Input Resistance (> 10 kHz) Rse = 500Ω each input to

25 GHz (typical) 28 GHz (typical),

23.1 ps (10-90%)

14.9 ps (20-80%)

17.4 ps (10-90%)

12.3 ps (20-80%)

25 GHz 28 GHz 28 GHz

17.6 ps (10-90%)

12.5 ps (20-80%)

Cse = 130 fF

input to ground Rdiff = 100 kΩ ±2% Rcm = 25 kΩ ±2%

ground Rdiff = 1 kΩ

Rcm = 250Ω

N5440A Ceramic ZIF Tip

26 GHz warranted

20.9 ps (10-90%)

13.8 ps (20-80%)

15.6 ps (10-90%)

11.0 ps (20-80%)

15.5 ps (10-90%)

11.0 ps (20-80%)

Cdiff = 32 fF Cse = 44 fF

Rse = 50 kΩ ±2% each input to ground Rdiff = 100 kΩ ±2%

Rcm = 25 kΩ ±2%

Rse = 500Ω each input to ground

Rdiff = 1 kΩ Rcm = 250Ω

N5447A High Sensitivity Ceramic ZIF Tip

28 GHz (typical)

20.9 ps (10-90%)

13.8 ps (20-80%)

15.5 ps (10-90%)

11.0 ps (20-80%)

15.5 ps (10-90%)

11.0 ps (20-80%)

Cdiff = 32 fF Cse = 44 fF

Rse = 25 kΩ ±2% each input to ground Rdiff = 50 kΩ ±2%

Rcm = 12.5 kΩ ±2%

Rse = 250Ω each input to ground

Rdiff = 500Ω Rcm = 125Ω

Input Voltage Range (Differential or Single-Ended)

Input Common Mode Range ±12V DC to 250 Hz

DC attenuation Ratio 6:1 6:1 3:1

Offset Range (for probing a single-ended signal)

Input Referred Noise Spectral Density

Input Referred Noise Example 4 mVrms 4 mVrms 2 mVrms

*Denotes warranted characteristic - all others are typical **Harmonic distortion < –38 dB is standard; < –34 dB wider input range with slightly increased distortion

InfiniiMax III Series Probes User’s Guide 61

1.6Vpp, ±0.8V (HD2&3< –38 dBc typ.),

2.5Vpp, ±1.25V (HD2&3< –34 dBc typ.) **

±1.25V > 250 Hz

±16V±16V±8V

23.9 nV/rt (Hz) 23.9 nV/rt (Hz) 12.0 nV/rt (Hz)

1.6Vpp, ±0.8V (HD2&3< –38 dBc typ.),

2.5Vpp, ±1.25V (HD2&3< –34 dBc typ.)**

±12V DC to 250 Hz ±1.25V > 250 Hz

0.8Vpp, ±0.4V (HD2&3< –38 dBc typ.),

1.6Vpp ±0.8V (HD2&3< –34 dBc typ.)**

±6V DC to 250 Hz ±0.65V > 250 Hz

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4 Performance Specifications / Characteristics

Table 10 N2803A Amplifier with N2838A, N5447A, and N5440A ZIF Tips (Sheet 2 of 2)

Specifications / Characteristics N5439A ZIF Probe Head

N2838A PC Board ZIF Tip

Maximum Input Voltage 18V peak CAT I 18V peak CAT I 18V peak CAT I

*Denotes warranted characteristic - all others are typical **Harmonic distortion < –38 dB is standard; < –34 dB wider input range with slightly increased distortion

N5440A Ceramic ZIF Tip

N5447A High Sensitivity Ceramic ZIF Tip

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Performance Specifications / Characteristics 4

Table 11 N2803A Amplifier with N5444A and N5445A Probe Heads (Sheet 1 of 2)

Specifications / Characteristics N5444A

SMA, 3.5 mm, 2.92 mm Adapter

Probe Bandwidth (–3 dB), Probe Only

Rise and Fall Time, Probe Only (Single-Ended)

Rise and Fall Time, Probe Only (Differential Mode)

System Bandwidth (–3 dB) with DSO/DSAX93204A

Rise and fall time with DSO/DSAX93204A 15.5 ps (10-90%)

Input Capacitance N/A Cdiff = 35 fF

DC Input Resistance* 55Ω to Vterm Rse = 50 kΩ ±2% each input to gnd

Input Resistance (> 10 kHz) 50Ω to (0.909)(Vterm) Rse = 500Ω each input to ground

30 GHz (typical) 30 GHz (typical),

15.5 ps (10-90%)

11.0 ps (20-80%)

15.5 ps (10-90%)

11.0 ps (20-80%)

30 GHz 30 GHz

11.0 ps (20-80%)

N5445A Browser

28 GHz warranted

16.2 ps (10-90%)

10.9 ps (20-80%)

14.5 ps (10-90%)

10.3 ps (20-80%)

14.3 ps (10-90%)

10.2 ps (20-80%)

Cse = 50 fF

Rdiff = 100 kΩ ±2% Rcm = 25 kΩ ±2%

Rdiff = 1 kΩ Rcm = 250Ω

Input Voltage Range (Differential or Single-Ended)

Input Common Mode Range ±6V DC to 250 Hz

DC attenuation Ratio 6:1 6:1

Offset Range (for probing a single-ended signal)

Input Referred Noise Spectral Density 23.9 nV/rt (Hz) 23.9 nV/rt (Hz)

Input Referred Noise Example 4 mVrms 4 mVrms

Maximum Input Voltage 8V peak without violating maximum

*Denotes warranted characteristic - all others are typical **Harmonic distortion < –38 dB is standard; < –34 dB wider input range with slightly increased distortion

1.6Vpp, ±0.8V (HD2&3< –34 dBc),

2.5Vpp, ±1.25V (HD2&3< –38 dB)**

±1.25V > 250 Hz without violating maximum input power

±6V without violating maximum input power

input power

1.6Vpp, ±0.8V (HD2&3< –34 dBc),

2.5Vpp, ±1.25V (HD2&3< –38 dB)**

±12V DC to 250 Hz ±1.25V > 250 Hz

±16V

18V peak CAT I

InfiniiMax III Series Probes User’s Guide 63

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4 Performance Specifications / Characteristics

max

rms

VinV

term

–()

()

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

Table 11 N2803A Amplifier with N5444A and N5445A Probe Heads (Sheet 2 of 2)

Specifications / Characteristics N5444A

SMA, 3.5 mm, 2.92 mm Adapter

Maximum Input Power 125 mW calculated with the

N5445A Browser

N/A

following equation for each input:

*Denotes warranted characteristic - all others are typical **Harmonic distortion < –38 dB is standard; < –34 dB wider input range with slightly increased distortion

64 InfiniiMax III Series Probes User’s Guide

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InfiniiMax III Probe Heads Dimensions

All dimensions included in this section are in millimeters [inches].

N2836A InfiniiMax III Solder-in Head Dimensions

Performance Specifications / Characteristics 4

N2838A InfiniiMax III PCB ZIF Tip with N5439A ZIF Head Dimensions

InfiniiMax III Series Probes User’s Guide 65

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4 Performance Specifications / Characteristics

N2848A InfiniiMax III QuickTIp Tip with N2849A QuickTip Head Dimensions

N5440A/N5447A InfiniiMax III Ceramic ZIF Tip with N5439A ZIF Head Dimensions

66 InfiniiMax III Series Probes User’s Guide

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Performance Specifications / Characteristics 4

N5441A InfiniiMax III Solder-in Head Dimensions

InfiniiMax III Series Probes User’s Guide 67

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4 Performance Specifications / Characteristics

68 InfiniiMax III Series Probes User’s Guide

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Keysight InfiniiMax III Series Probes

User’s Guide

5 Calibration / Deskew

Procedure

To perform a calibration/deskew for the InfiniiMax III Probing system, you will be using the N5443A Calibration/Deskew Fixture.

This fixture enables you to not only calibrate / deskew your InfiniiMax III probe, but it also ensures you properly position the probe amplifier during the procedure via the plastic holder. You can remove the plastic holder from the fixture by removing the four screws on the bottom side of the holder if you prefer.

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5 Calibration / Deskew Procedure

Procedure

1 To perform a DC calibration / calibrated skew, make sure the 50 ohm terminator (included

with N5443A) is connected to the fixture as shown below.

2 Hold the N5443A upright and connect the fixture to the Cal Out on the oscilloscope. Turn

the nut on the Cal Out counter-clockwise to tighten.

3 While holding the fixture upright with one hand, use an 8 in. lbs. torque wrench to fully

tighten the connector as shown on the next page.

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Calibration / Deskew Procedure 5

CAUTION

4 Connect the probe amplifier to one of the channel inputs on the oscilloscope.

5 Insert the amplifier into the top of the fixture holder. The amplifier can slide up and down in

the holder to adjust the probe head position.

Always wear an ESD wrist strap when working with active probes. Not doing so can result in the probe becoming permanently damaged.

6 Before connecting to the N5443A fixture, form the N5439A probe head ZIF tip wires as

shown below (if using the ZIF tip for the calibration / deskew). If you are using the browser probe head then you do not need to adjust the shape of the tips.

InfiniiMax III Series Probes User’s Guide 71

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5 Calibration / Deskew Procedure

Form the wires as shown below if using the N5441A solder-in probe head.

7 Connect your probe head to the amplifier.

8 Position the probe head wires (if you are using the ZIF or Solder-in probe heads) so they

curl towards the scope as shown below.

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Calibration / Deskew Procedure 5

9 Press the Menu button on the probe amplifier to bring up the Probe Setup dialog box on

the oscilloscope.

10 In the Probe Setup dialog box, click on the Calibrate Probe ... button. This will open the

Probe Calibration dialog box.

11 In the Probe Calibration dialog box, select the probe head you are using in the Head Label

(Type) field, select the Calibrated Atten/Offset radio button, and press the Start Atten/Offset Calibration... button.

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5 Calibration / Deskew Procedure

NOTE

12 A dialog box will then open that tells you how to connect the probe head to the

calibration/deskew fixture.

The fixture has three spring-loaded fingers (shown below) that clamp probe head wires to the fixture if you are using the ZIF probe head or the Solder-in probe head.

13 On the fixture, the center gold trace is signal and the large plates on either side are both

ground as shown below.

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Calibration / Deskew Procedure 5

CAUTION

NOTE

CAUTION

Never solder a probe tip to the thickfilm gold. The gold will immediately dissolve into the solder and disappear.

14 Follow the instructions on the oscilloscope to clamp the wires to either the signal or

ground. When connecting the probe wires to the fixture, press down on the spring-loaded fingers described in Step 12 and insert the probe wires. You can check that the wires are connected correctly by pressing the autoscale button on the front panel and checking that you have a stable step on screen (note that pressing autoscale will close the Probe Calibration dialog box).

People tend to have their own preference for this step in terms of the angle to view and insert the probe wires under the spring-loaded fingers. Try different angles to determine your optimum method.

When connecting the probe head to the fixture, do not press down with much force or you could snap off the fixture from the Cal Out connection. Light contact is all that is needed for the calibration.

15 If you are using the browser probe head, it is recommended that you use the N2787A 3D

Probe Positioner to hold the browser in place (as shown below). The browser uses spring-loaded tips so you do not need much force to get a solid contact. You can check that the tips are connected correctly by pressing the autoscale button on the front panel

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5 Calibration / Deskew Procedure

CAUTION

NOTE

and checking that you have a stable step on screen (note that pressing autoscale will close the Probe Calibration dialog box).

16 With the probe head correctly connected to the fixture, press OK in the dialog box on the

oscilloscope and wait for the calibration to finish. It will report whether the calibration was successful or not.

17 Once the calibration has successfully completed, the DC Cal LED on the probe amplifier

will turn green indicating that the particular combination of probe amplifier, probe head, and oscilloscope channel input has been calibrated.

Any time you use a new probe head type, a new probe amplifier, or a different channel on the oscilloscope, the DC Cal LED will be amber, indicating that a DC calibration is required.

18 Once the DC vertical calibration has successfully completed, select the Calibrated Skew

radio button from the Probe Calibration dialog box on the oscilloscope. Then press the Start Skew Calibration... button and follow the on-screen instructions for the skew calibration.

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Keysight InfiniiMax III Series Probes

CAUTION

User’s Guide

6 Performance Verification

Bandwidth Performance Verification 78 DC Input Resistance Performance Verification 96 Performance Test Record 99

This chapter describes the equipment and procedures needed to verify the performance of InfiniiMax III probes. Due to the very high frequency of the InfiniiMax III probing system, it is important to carefully adhere to the techniques and procedures described in this chapter to accurately measure the performance.

It is also important to note that the performance measured here is of the probe by itself. Keysight high performance real-time scopes (and sampling scopes under certain conditions) will apply probe correction that will further enhance the performance of the probes.

Electrostatic discharge (ESD) can quickly and imperceptibly damage or destroy high performance probes, resulting in costly repairs. Always wear a wrist strap when handling probe components and insure that cables are discharged before being connected.

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6 Performance Verification

Bandwidth Performance Verification

This section documents the bandwidth performance of the N2803A InfiniiMax III Probe Amplifier with the N5439A ZIF probe head and N5440A ceramic ZIF tip or with the N5445A browser probe head.

Keysight recommends a test interval of one year or 2000 hours of operation.

Equipment Needed

• Keysight 2 port E8361A/C Vector Network Analyzer:

• Or equivalent VNA that covers at least a 50 MHz to 34 GHz range. This procedure is

written assuming the E8361A/C PNA. If a different VNA is used, references that are specific to the PNA will need to be modified.

• Needs proper test port cables and/or adaptors to provide male 2.92 mm connectors

at reference planes. If test port cables are 2.4 mm or 1.85 mm cables, then Keysight 11904A and 11904D adaptors can be used to convert to 2.92 mm male connectors.

• Needs to be capable of using a Touchstone file to de-embed at a port.

• Needs to have bias port for port 1 of the VNA (i.e. has internal bias T’s and a BNC

port that allows bias to be applied to port 1)

• Keysight N5443A Performance Verification Fixture.

• Maury Microwave 8775B2 2.92 mm male broadband load, or other 2.92 mm male load with similar or better return loss. A high quality 2.92 mm adaptor to a 2.4 mm or

1.85 mm VNA calibration load with required return loss could be used.

• Keysight N5477A Autoprobe II/3.5 mm Adaptor.

• Keysight 1143A Power supply.

• Keysight 5062-1247 outside thread 3.5 mm (male) to 3.5 mm (female) adaptor.

• Keysight N4692A-00F 2.92 mm (female/female) ECal module. Or, other 2.92 mm calibration kit that can calibrate to the 2.92 mm male connectors at the test ports.

• BNC 50 ohm male terminator or equivalent; not a critical part. For example, Pomona number 3840-50 or 4119-50.

• InfiniiMax III Probe Head. Either the N5439A ZIF probe head with the N5440A ceramic ZIF probe tip or the N5445A browser probe head.

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VNA Setup

CAUTION

•Power level: –6 dBm.

• Sweep: Log Frequency 50 MHz to 34 GHz, 284 points (100 pts/decade).

•IF BW: 1 kHz.

• Test port cables and adaptors (if needed) to provide male 2.92 mm connectors at

• Install the BNC 50 ohm terminator to the bias input for port 1 of the VNA (on the rear

• Clear all traces from display, then select S12 to display.

• Set scale for S12 to 3 dB/div, with reference level to 0 dB and reference position to 5

Procedure

1 Calibrate the PNA to the two male 2.92 mm connectors (connectors can be seen in

Figure 62) using the N4692A-00F ECal module (or equivalent 2.92 mm cal kit).

Performance Verification 6

measurement planes.

panel of E8361 PNA). This provides a DC 50 ohm termination for the probe amp output.

divisions.

As with all precision connector interfaces, make sure to torque all connections using the proper torque wrench!

2 Prepare the N5439A ZIF probe head for connection to the PV fixture as shown in Figure 61.

Install a N5440A ceramic ZIF tip into the N5439A ZIF probe head. Make sure it is fully inserted.

b Bend the tip wires down at their halfway point using fine tweezers.

c Slightly spread the tips wires to better match the spacing needed for the PV

fixture.

Figure 61 N5439A ZIF Probe Head

3 Connect the 1250-1749 adapter and N5443A PV fixture assembly to the calibrated ports of

the PNA as shown in Figure 62. A small bench vise is useful to hold PV fixture steady.

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6 Performance Verification

Figure 62 Setup for measuring “Vin” of probe

4 Connect the N5477A AutoProbe II adaptor to the 1143A power supply and turn on the

power supply.

Make sure the probe offset control button on the 1143A is set to “Zero” so no probe offset is applied.

b The 5062_1247 adapter should be attached to the N5477A and properly

torqued.

5 Connect the probe amp pod end to the N5477A and torque connector.

6 Connect the probe to the N5443A PV fixture:

Probe amp with ZIF probe head is inserted into the PV holder far enough that the tip wires can easily reach the pinchers on the PV fixture.

b Form the coax cables so that the tip wires are close to the pincher points

before trying to connect the tip wires. The connectors between the probe head and the probe amp can be rotated to align the probe tip properly to the pinchers. Since the center trace of the PV fixture is above the ground plane, the probe head should be tipped slightly so the tip wires touch the center trace and ground plane at the same time.

c Depress the actuators on the pinchers and carefully insert one wire under

the center pincher and the other wire under one of the side pinchers. Either polarity of the probe can be tested and will yield the same results (but

80 InfiniiMax III Series Probes User’s Guide

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Performance Verification 6

opposite phase) if the probe is working properly. Figure 63 shows a close up of the tip wires positioned under the pinchers.

d Ideally the probe head should not be angled toward the port 2 side of the PV

fixture, but a slight angle of 5 degrees is acceptable. If angled too much, the measured BW of the probe will be degraded due to coupling from the trace to the probe tip.

Figure 63 Close-up of tip wires positioned under pinchers

7 Install the proper file to de-embed the 1250-1749 adapter and the output side of the

N5443A (i.e. the path from the male 2.92 mm connector to the probe point of the N5443A) from port 1 of the VNA.

Create a Touchstone file for the 1250-1749 and N5443A PV fixture by cutting and pasting the text in “Touchstone File (1250-1749 & N5443A)" on page 88. Name the file Adaptor_1250_1749___OutputSideOfFixture_N5443A.s2p.

b On the VNA, go to menu “Calibration/Fixturing Selections/2 Port

De-embedding” and select Port 1.

c Set S2P file selection to the file saved in step a.

d Check the “Enable De-embedding”.

e Under “Calibration” menu, select “Fixturing ON/off” to turn on

de-embedding.

8 Trigger VNA to perform a single sweep. a. Press “Trigger” under Channel Setup, and then

the green soft-key for “Single”. Display should look like Figure 64. If it looks noticeably different, the probe tip wires may not be making contact under the pinchers.

9 Under “Trace/Math/Memory” select “Data->Memory”. This will save the de-embedded

input voltage trace into the memory.

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6 Performance Verification

Figure 64 De-embedded “Vin” trace

10 Now move the 2.92 mm male test port 1 connector to the 5062_1247 adapter and N5477A

Autoprobe II adapter assembly. Connect the Maury Microwave 8775B2 2.92 mm male broadband load to the 1250_1749 adaptor and N5443A PV fixture assembly. This new setup is shown in Figure 65. Torque all connections.

11 Install the proper file to de-embed the 5062_1247 adapter and N5477A adapter from port

1 of the VNA.

Create a Touchstone file for the 5062-1247 and N5477A by cutting and pasting the text in “Touchstone File (5062-1247 & N5477A)" on page 92. Name the file Adapter_5062_1247___Adapter_N5477A.s2p.

b Go to menu “Calibration/Fixturing Selections/2 Port De-embedding” and

select Port 1.

c Set S2P file selection to the file saved in step a.

d Make sure the “Enable De-embedding” box is still checked.

e Under “Calibration” menu, make sure “Fixturing ON/off” is still checked so

file is being used for de-embedding.

82 InfiniiMax III Series Probes User’s Guide

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12 Trigger VNA to perform a single sweep.

Press “Trigger” under Channel Setup, and then the green soft-key for “Single”.

b Under “Scale” menu, adjust the reference level until the 50 MHz point (left

side of the screen) is at center screen. Reference level should be approximately -15.3 dB, but can vary a few tenths of a dB either way.

c Display should look like Figure 66. If it looks noticeably different, the probe

tip wires may not be making contact under the pinchers.

Performance Verification 6

Figure 65 Setup to measure “Vout” of probe

InfiniiMax III Series Probes User’s Guide 83

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6 Performance Verification

Figure 66 De-embedded “Vout” trace

13 Under menu “Trace/Math/Memory” select “Data/Memory” in the “Data Math” box.

This will divide the current trace (de-embedded vout trace) by the memory

trace (de-embedded vin trace) and therefore show the voltage transfer function of the probe or “vout/vin”.

b Again, adjust the “Reference Level” in the scale menu so the 50MHz point is

at center screen. The display should look like Figure 67.

c Turn on a marker and adjust it to where the trace crosses 3 dB below the

50 MHz point (which is 1 division below center screen since screen is set to 3 dB/div).

d Verify that the BW is ≥ 26 GHz for the N5440A ceramic ZIF tip, N5439A ZIF

probe head, and N2803A 30 GHz probe amp combination.

84 InfiniiMax III Series Probes User’s Guide

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Performance Verification 6

NOTE

Figure 67 De-embedded “Vout/Vin” response of the probe

You only need to perform the Bandwidth Performance Verification test with the ZIF tip as described above. If the probe passes with the ZIF probe head then it will pass with the browser probe head as well. You are not required to test the bandwidth specification with both probe heads. If you have the choice between using the ZIF probe head or the browser, Keysight suggests using the ZIF probe head because measurements are more repeatable with it and it is easier to make a proper connection.

To measure the performance of the N5445A Browser with the N2803A probe amp, the same procedure as described above is used except the browser is held in position with a probe positioner. This setup is shown in Figure 69 and Figure 69 using the Keysight N2787A 3D Probe Positioner.

1 Tilt the browser slightly so the two tips touch the center trace and the ground plane on the

PV fixture at about the same time.

2 Probe the halfway point between the where the pinchers are and where the microstrip

transitions into the rectangular coax line.

3 Set the span of the browser to the minimum possible as should in this picture:

InfiniiMax III Series Probes User’s Guide 85

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6 Performance Verification

Figure 68 Probe Tips on Microstrip

86 InfiniiMax III Series Probes User’s Guide

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Performance Verification 6

Figure 69 N2787A 3D Probe Positioner used to measure the N5445A browser with the

N2803A amp

InfiniiMax III Series Probes User’s Guide 87

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6 Performance Verification

NOTE

Touchstone File (1250-1749 & N5443A)

Cut and paste the following text and save in a text file named Adapter_1250_1749___OutputSideOfFixture_N5443A.s2p. This file is used in Step 7 on page 81.

You’ll also find the following data on the Adobe AIR version of the Probe Resource Center (PRC). Copying this data from the PRC is the simplest most reliable method to get the data. To download the PRC, visit http://www.Keysight.com/find/PRC.

! freq S11 S21 S12 S22 !Port 1=female 3.5mm connector of 1250-1749 adaptor, Port 2=probe point on N5443A fixture # Hz S DB R 50

50000000.000000 -49.528411 110.869328 -0.026318 -4.180881 -0.025870 -4.223772 -67.754661 -176.153454

51165694.067857 -49.988587 91.181375 -0.025517 -4.280433 -0.024720 -4.324675 -68.880923 -164.662475

52358564.988911 -50.522661 71.165730 -0.024697 -4.382306 -0.023543 -4.427929 -70.190588 -152.193533

53579246.361093 -51.148132 50.755093 -0.023858 -4.486555 -0.022339 -4.533591 -71.710672 -138.296498

54828386.553961 -51.883012 29.852775 -0.023000 -4.593234 -0.021107 -4.641716 -73.455393 -122.229302

56106649.053084 -52.745137 8.328609 -0.022122 -4.702400 -0.019846 -4.752362 -75.383422 -102.800368

57414712.812455 -53.751090 -13.985221 -0.021223 -4.814111 -0.018557 -4.865588 -77.285484 -78.453735

58753272.615119 -54.914477 -37.296089 -0.020304 -4.928426 -0.017237 -4.981454 -78.641246 -48.710849

60123039.442212 -56.136285 -60.059373 -0.019410 -5.044783 -0.015920 -5.098670 -78.505514 -17.996645

61524740.850598 -56.339746 -65.253403 -0.018972 -5.157375 -0.014907 -5.204612 -74.600997 0.238726

62959121.359318 -56.549712 -70.614809 -0.018523 -5.272593 -0.013871 -5.313024 -71.786638 16.619539

64426942.845040 -56.765722 -76.151300 -0.018064 -5.390497 -0.012811 -5.423964 -69.665881 32.555062

65928984.946733 -56.987159 -81.870529 -0.017595 -5.511150 -0.011726 -5.537491 -68.056466 48.587163

67466045.479778 -57.213226 -87.779882 -0.017115 -5.634616 -0.010616 -5.653665 -66.866526 65.023732

69038940.859729 -57.442930 -93.886209 -0.016623 -5.760962 -0.009481 -5.772548 -66.050126 82.119449

70648506.535956 -57.624590 -110.396155 -0.016195 -5.894832 -0.009445 -5.897344 -64.822182 90.200098

72295597.435395 -57.551220 -142.499775 -0.015869 -6.038769 -0.011116 -6.029813 -62.891316 82.809542

73981088.416647 -57.272309 -174.184620 -0.015537 -6.186061 -0.012827 -6.165369 -61.314332 74.543748

75705874.734666 -56.913609 155.103108 -0.015196 -6.336786 -0.014577 -6.304085 -59.987656 65.638030

77470872.516269 -56.615036 125.361237 -0.014847 -6.491025 -0.016368 -6.446035 -58.847549 56.200571

79277019.246748 -56.489319 96.190629 -0.014491 -6.648860 -0.018202 -6.591294 -57.851655 46.281987

81125274.267814 -56.086810 77.082571 -0.015125 -6.803245 -0.019025 -6.749358 -57.369635 49.668006

83016619.287160 -55.464039 64.084902 -0.016432 -6.956544 -0.019176 -6.917300 -57.199270 61.953448

84952058.899892 -54.917900 50.564549 -0.017770 -7.113416 -0.019329 -7.089158 -57.075871 74.341353

86932621.122130 -54.439335 36.470021 -0.019138 -7.273947 -0.019487 -7.265023 -57.007441 86.897368

88959357.937037 -54.018288 21.746324 -0.020539 -7.438220 -0.019648 -7.444988 -57.001200 99.698955

91033345.853589 -54.097863 14.550734 -0.021520 -7.608109 -0.020285 -7.619545 -56.504223 102.747003

93155686.478363 -54.688270 15.600999 -0.022057 -7.783797 -0.021424 -7.788273 -55.536632 95.350174

95327507.100664 -55.335875 16.745463 -0.022606 -7.963581 -0.022589 -7.960934 -54.662417 87.625100

97549961.291281 -56.051127 18.007724 -0.023168 -8.147556 -0.023782 -8.137620 -53.867407 79.587653

99824229.515220 -56.847547 19.421327 -0.023744 -8.335819 -0.025002 -8.318424 -53.140655 71.244030

102151519.758706 -57.028409 32.229328 -0.024811 -8.518103 -0.025270 -8.526257 -53.229937 71.824660

104533068.170813 -57.203696 45.767193 -0.025943 -8.703769 -0.025461 -8.740842 -53.390484 73.175172

106970139.720046 -57.452641 59.100435 -0.027102 -8.893763 -0.025657 -8.960430 -53.558351 74.544470

109464028.866236 -57.799354 72.247228 -0.028288 -9.088187 -0.025857 -9.185138 -53.734081 75.931667

112016060.248099 -58.205431 76.407713 -0.028945 -9.298506 -0.026957 -9.388528 -53.893471 72.124731

114627589.386818 -58.637120 78.159701 -0.029466 -9.516820 -0.028326 -9.589435 -54.061522 66.848820

117300003.406038 -59.105065 79.877381 -0.029999 -9.740223 -0.029727 -9.795026 -54.247548 61.492888

120034721.768639 -59.584054 81.490201 -0.030537 -9.968856 -0.031146 -10.005562 -54.448452 56.117498

122833197.030691 -57.847096 78.713336 -0.030505 -10.204469 -0.031384 -10.233007 -54.242926 55.717121

125696915.612984 -56.373050 75.635986 -0.030472 -10.445575 -0.031627 -10.465755 -54.037670 55.307462

128627398.590544 -55.090007 72.338796 -0.030439 -10.692303 -0.031876 -10.703929 -53.832682 54.888298

131626202.500562 -54.306379 66.932129 -0.030205 -10.948451 -0.031570 -10.953764 -53.494817 54.988088

134694920.169152 -53.880297 59.647516 -0.029793 -11.213741 -0.030773 -11.214700 -53.052945 55.558900

137835181.557386 -53.486272 52.104536 -0.029372 -11.485216 -0.029957 -11.481720 -52.622790 56.157336

141048654.627056 -53.508282 45.730461 -0.030159 -11.752986 -0.030107 -11.751715 -52.284361 56.421252

144337046.226616 -54.420700 42.364200 -0.033536 -12.005802 -0.032342 -12.021139 -52.117964 55.931890

147702102.997784 -55.470568 39.211352 -0.036994 -12.264512 -0.034630 -12.296845 -51.951089 55.430858

151145612.303275 -55.576811 37.842963 -0.039670 -12.539287 -0.036049 -12.583748 -51.944456 54.446241

154669403.176167 -53.732676 40.105390 -0.040639 -12.841065 -0.035607 -12.887130 -52.278075 52.497820

158275347.291397 -52.178102 42.969822 -0.041630 -13.149878 -0.035156 -13.197584 -52.635093 50.550437

161965359.959910 -52.004259 45.986266 -0.041770 -13.470541 -0.034641 -13.513759 -52.766109 50.989381

165741401.145982 -53.013032 48.920340 -0.041128 -13.802856 -0.034066 -13.835944 -52.680124 53.568723

169605476.508267 -54.185614 51.938022 -0.040471 -14.142918 -0.033479 -14.165639 -52.594837 56.183902

173559638.465103 -53.353535 46.144495 -0.039591 -14.466058 -0.034106 -14.495652 -52.681223 53.054380

177605987.284668 -52.395549 39.070167 -0.038666 -14.793912 -0.034887 -14.832523 -52.797494 49.218907

181746672.200541 -52.169589 35.688968 -0.038595 -15.133923 -0.035919 -15.178503 -53.030384 48.315967

185983892.553281 -52.903697 37.808367 -0.039749 -15.488188 -0.037303 -15.534312 -53.432713 51.562899

190319898.958608 -53.671016 40.107673 -0.040862 -15.851057 -0.038670 -15.897833 -53.787995 54.424805

194756994.502833 -53.801795 43.465778 -0.041123 -16.226810 -0.039438 -16.262335 -53.156789 52.243875

199297535.966146 -53.943086 46.823120 -0.041390 -16.611323 -0.040225 -16.635334 -52.557852 50.013514

88 InfiniiMax III Series Probes User’s Guide

Page 89

203943935.074433 -53.374619 45.618787 -0.044122 -16.994561 -0.041601 -17.016611 -52.209576 52.395133

208698659.780268 -52.713418 43.564007 -0.047367 -17.384868 -0.043113 -17.406702 -51.910498 55.677837

213564235.573780 -53.477228 35.859633 -0.049667 -17.770211 -0.046242 -17.803783 -51.477695 53.799018

218543246.824077 -55.032566 26.702114 -0.051641 -18.159282 -0.050036 -18.209336 -51.013276 49.886314

223638338.151939 -53.869091 26.218432 -0.052370 -18.572260 -0.051093 -18.629032 -51.239963 47.730420

228852215.834522 -51.902344 30.275653 -0.052588 -19.000945 -0.051017 -19.060434 -51.778596 46.370604

234187649.242808 -51.933827 29.735652 -0.051672 -19.458329 -0.050622 -19.511235 -52.618817 43.686630

239647472.312564 -52.501771 27.821456 -0.050415 -19.931623 -0.050130 -19.975167 -53.656204 40.914797

245234585.049599 -51.831039 34.835393 -0.052075 -20.398897 -0.050775 -20.408282 -54.529939 34.582488

250951955.070115 -51.206936 39.614303 -0.053717 -20.877562 -0.050675 -20.855888 -54.904078 27.538703

256802619.176963 -50.965190 28.605202 -0.054066 -21.375945 -0.046274 -21.351120 -52.552449 17.284825

262789684.972659 -50.758459 28.217659 -0.053702 -21.875920 -0.045857 -21.868062 -51.711832 15.564753

268916332.509994 -50.587835 40.516894 -0.052486 -22.375796 -0.050221 -22.408982 -52.202077 23.079380

275185815.981130 -51.754800 32.581293 -0.054937 -22.906560 -0.050202 -22.929332 -52.401581 27.377763

281601465.446084 -52.426237 23.436322 -0.057360 -23.444084 -0.049220 -23.461590 -52.225369 30.372145

288166688.601492 -50.141722 22.093874 -0.057147 -23.964218 -0.048206 -24.027394 -51.161468 31.686174

294884972.590629 -49.853653 30.887087 -0.057999 -24.535771 -0.050035 -24.592002 -51.268626 22.265828

301759885.855612 -49.776989 38.708272 -0.059389 -25.124388 -0.052090 -25.164841 -51.422057 12.143268

308795080.032796 -48.347696 33.823620 -0.061131 -25.692961 -0.051459 -25.752786 -50.227178 13.737775

315994291.892351 -48.485936 29.549305 -0.059722 -26.288759 -0.054400 -26.334640 -49.610356 17.239374

323361345.323065 -48.665429 24.275657 -0.058597 -26.902100 -0.056825 -26.949053 -49.521928 23.486824

330900153.363414 -48.490653 18.844559 -0.058508 -27.532108 -0.057357 -27.600499 -49.949091 29.735275

338614720.279990 -48.115523 23.731233 -0.057500 -28.187494 -0.055355 -28.226210 -50.295079 15.284824

346509143.694381 -47.416900 25.416394 -0.058853 -28.843482 -0.058986 -28.876449 -49.620245 11.560046

354587616.759638 -47.838026 23.437700 -0.061373 -29.502109 -0.060345 -29.544775 -49.384503 7.983506

362854430.387485 -48.753096 20.588112 -0.064328 -30.185369 -0.060547 -30.226722 -49.304935 5.118950

371313975.527454 -48.438196 19.789363 -0.066839 -30.908078 -0.063211 -30.919712 -48.959273 7.111174

379970745.499151 -47.335734 18.341686 -0.067669 -31.598820 -0.062202 -31.629439 -50.947829 8.447970

388829338.378905 -47.288518 18.480970 -0.069668 -32.364173 -0.063655 -32.378360 -49.035406 3.520875

397894459.442048 -47.186291 13.294545 -0.075098 -33.096733 -0.066338 -33.140263 -47.851278 4.310910

407170923.662146 -46.940356 14.281384 -0.073798 -33.866977 -0.066345 -33.855087 -48.397382 2.145757

416663658.268484 -47.171461 14.761701 -0.075883 -34.639733 -0.070645 -34.639129 -48.716178 1.898130

426377705.363190 -46.365553 7.572152 -0.076247 -35.447314 -0.071046 -35.477949 -48.899175 2.468785

436318224.599360 -46.701580 7.151913 -0.076870 -36.265959 -0.071287 -36.319100 -49.620160 -4.118647

446490495.921630 -47.160978 13.689850 -0.075994 -37.111578 -0.072545 -37.175224 -50.397815 -8.680461

456899922.370640 -47.396507 5.107440 -0.077071 -37.989362 -0.073385 -38.033366 -49.671733 -15.929710

467552032.952879 -46.077313 2.865178 -0.082064 -38.861189 -0.075185 -38.898976 -49.133541 -14.551426

478452485.577434 -45.259095 -4.008123 -0.080006 -39.743034 -0.076419 -39.807567 -49.683609 -21.223063

489607070.061218 -45.485801 0.581757 -0.083491 -40.697038 -0.079818 -40.709941 -50.060529 -34.194193

501021711.204246 -46.603526 -10.039365 -0.083755 -41.665129 -0.077315 -41.682717 -48.792928 -16.944997

512702471.936616 -45.029650 -7.000027 -0.081662 -42.639573 -0.084559 -42.668191 -47.488874 -20.655839

524655556.538861 -44.514984 -6.354720 -0.079332 -43.615551 -0.083707 -43.641378 -48.492928 -32.031639

536887313.937376 -44.290770 -6.568840 -0.082138 -44.648013 -0.083945 -44.653837 -48.957638 -36.719941

549404241.076669 -43.504772 -8.685522 -0.083652 -45.691901 -0.084815 -45.691684 -49.515830 -29.325183

562212986.370243 -43.481121 -10.960529 -0.085501 -46.733135 -0.082668 -46.765101 -49.399910 -23.211836

575320353.231926 -43.193036 -11.045160 -0.084422 -47.837255 -0.085212 -47.869091 -48.549704 -24.186062

588733303.689526 -43.579719 -5.409896 -0.088905 -48.969584 -0.085630 -48.973225 -47.693589 -29.030108

602458962.082744 -43.188600 -6.651222 -0.088581 -50.106860 -0.090320 -50.094811 -47.786787 -31.167939

616504618.847291 -42.930989 -6.216016 -0.089156 -51.257875 -0.092166 -51.276355 -47.608082 -38.990988

630877734.387229 -43.378333 -4.283740 -0.093976 -52.437082 -0.089960 -52.477553 -47.686557 -37.227422

645585943.037598 -42.988551 -8.753781 -0.093823 -53.639519 -0.091066 -53.698415 -46.547666 -40.593444

660637057.119418 -42.596030 -12.785888 -0.103544 -54.904243 -0.095545 -54.940053 -47.106751 -48.137651

676039071.089234 -42.679026 -16.442780 -0.100600 -56.176567 -0.092255 -56.223911 -47.286734 -45.912639

691800165.785404 -43.248582 -16.783776 -0.101186 -57.495739 -0.095262 -57.497232 -48.306455 -50.044404

707928712.773379 -42.415380 -19.285387 -0.103842 -58.815086 -0.098396 -58.854555 -47.089721 -60.118742

724433278.792294 -41.987336 -27.097520 -0.102116 -60.184767 -0.100383 -60.223125 -47.381752 -64.403202

741322630.305226 -42.380172 -26.675550 -0.103107 -61.606922 -0.099178 -61.610960 -47.908203 -66.412340

758605738.155530 -42.072895 -29.384976 -0.104426 -63.042400 -0.101633 -63.063497 -47.780003 -67.506873

776291782.331738 -41.656096 -32.657305 -0.107282 -64.497662 -0.106240 -64.506014 -46.469069 -72.198347

794390156.843548 -41.748908 -30.061058 -0.109317 -66.001852 -0.105904 -66.011789 -47.270100 -73.483172

812910474.711483 -41.239790 -29.316570 -0.111042 -67.520247 -0.104695 -67.553979 -46.437563 -75.346862

831862573.072888 -40.820512 -28.868361 -0.110486 -69.092396 -0.106359 -69.109196 -46.689929 -71.382011

851256518.406959 -40.299703 -33.428087 -0.112605 -70.722280 -0.107949 -70.719090 -44.864237 -79.807143

871102611.881596 -40.581509 -33.326230 -0.117064 -72.357940 -0.111254 -72.364310 -45.374639 -83.129710

891411394.824904 -40.118229 -36.220425 -0.117204 -74.035916 -0.111664 -74.040042 -45.840643 -83.576746

912193654.324260 -39.532418 -35.546012 -0.117644 -75.756995 -0.111502 -75.761397 -45.992895 -89.364030

933460428.955917 -39.179015 -40.983687 -0.117874 -77.510221 -0.113750 -77.547756 -47.068488 -100.546539

955223014.648186 -39.364010 -46.292129 -0.118168 -79.321186 -0.116241 -79.345373 -46.697516 -107.536739

977492970.681309 -39.278675 -46.564818 -0.119686 -81.179525 -0.117531 -81.189173 -47.024828 -111.261956

1000282125.827218 -39.194967 -51.270372 -0.123784 -83.060780 -0.122650 -83.091199 -46.955841 -115.956987

1023602584.632427 -38.638711 -50.107386 -0.127481 -84.951909 -0.124243 -84.986961 -45.812369 -116.830342

1047466733.847416 -38.254716 -50.795831 -0.130664 -86.951714 -0.126013 -86.984689 -46.398595 -124.148154

1071887249.005892 -38.159836 -50.090886 -0.129842 -88.962105 -0.122894 -88.985826 -45.298698 -117.918878

1096877101.157453 -38.225707 -53.761634 -0.132812 -91.046094 -0.128113 -91.085312 -45.697061 -122.970507

1122449563.757208 -37.836836 -52.245928 -0.132701 -93.180867 -0.128419 -93.190744 -45.762256 -131.225754

1148618219.716024 -37.144353 -57.251248 -0.140371 -95.308530 -0.133202 -95.358212 -44.877794 -135.721493

1175396968.615140 -36.980899 -62.823348 -0.137923 -97.548113 -0.134986 -97.590029 -45.036304 -146.770725

1202800034.088982 -36.556652 -64.800739 -0.142085 -99.804380 -0.134988 -99.843209 -44.642492 -151.036760

Performance Verification 6

InfiniiMax III Series Probes User’s Guide 89

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6 Performance Verification

1230841971.380104 -36.368154 -66.008920 -0.139317 -102.172138 -0.135905 -102.176340 -45.350402 -159.255608

1259537675.070255 -36.484368 -70.298488 -0.140443 -104.535698 -0.138102 -104.561407 -45.199506 -167.298406

1288902386.991699 -36.100137 -71.663451 -0.143996 -106.965470 -0.140718 -106.990081 -44.237343 -167.377205

1318951704.322966 -35.647399 -70.676147 -0.143407 -109.444778 -0.141530 -109.473265 -44.479826 -166.526112

1349701587.873357 -35.473004 -76.169267 -0.144837 -111.996785 -0.140095 -112.024550 -44.898263 -168.705245

1381168370.560588 -35.397257 -76.199011 -0.151281 -114.619927 -0.143939 -114.641006 -44.459548 -179.894988

1413368766.086080 -34.861640 -79.603023 -0.149326 -117.283372 -0.147051 -117.307324 -44.548533 166.433716

1446319877.812507 -34.675802 -83.685975 -0.154729 -120.021826 -0.148112 -120.068082 -43.870957 156.340597

1480039207.848310 -34.403859 -87.183840 -0.154624 -122.809345 -0.149335 -122.837405 -43.122876 147.931664

1514544666.344010 -34.182262 -87.576024 -0.156786 -125.682377 -0.148638 -125.705803 -43.408595 145.144573

1549854581.005252 -33.860562 -89.317043 -0.159620 -128.583658 -0.151584 -128.632751 -42.575215 145.798996

1585987706.827638 -33.879884 -90.737689 -0.160755 -131.597325 -0.154725 -131.631979 -43.172777 140.875243

1622963236.058510 -33.429276 -94.739265 -0.163689 -134.669991 -0.157934 -134.692000 -43.227570 129.498215

1660800808.390988 -33.329643 -99.088811 -0.168803 -137.806336 -0.161831 -137.822013 -41.965972 120.296582

1699520521.395668 -33.017248 -104.260619 -0.168570 -141.018492 -0.160178 -141.044358 -40.920686 110.637802

1739142941.195521 -32.875921 -105.450952 -0.171025 -144.279383 -0.166273 -144.317413 -40.643020 104.699352

1779689113.389672 -32.708201 -107.063801 -0.172504 -147.660075 -0.162445 -147.682016 -40.660603 105.009991

1821180574.231843 -32.495401 -108.239493 -0.175914 -151.100173 -0.165749 -151.139895 -40.823790 97.679422

1863639362.069423 -32.536928 -113.587393 -0.175658 -154.611897 -0.171416 -154.640531 -39.630700 90.191237

1907088029.049217 -32.190830 -117.633228 -0.178971 -158.232186 -0.173995 -158.258872 -39.196315 79.035112

1951549653.096104 -31.667674 -122.733655 -0.181069 -161.898184 -0.177993 -161.940825 -38.680786 73.511229

1997047850.170966 -31.681756 -124.558337 -0.184890 -165.657486 -0.180560 -165.712594 -37.957528 67.017074

2043606786.814396 -31.524438 -126.951023 -0.176373 -169.592160 -0.173181 -169.599395 -37.812786 61.527222

2091251192.982845 -31.508596 -130.420301 -0.180521 -173.557368 -0.178375 -173.563860 -37.808832 56.560157

2140006375.184037 -31.352237 -136.421437 -0.182092 -177.562606 -0.175784 -177.610847 -36.745367 46.399887

2189898229.918614 -30.957173 -139.919378 -0.185269 178.278037 -0.182462 178.249234 -35.930516 41.270528

2240953257.435161 -30.915880 -143.280497 -0.187083 174.043814 -0.180237 174.012118 -35.847724 33.647802

2293198575.805914 -31.061429 -144.990888 -0.191682 169.730086 -0.184977 169.668447 -35.634129 29.520399

2346661935.330630 -30.824427 -150.030321 -0.192955 165.294346 -0.189879 165.273329 -35.125695 22.434121

2401371733.276259 -30.711442 -156.357424 -0.197804 160.749968 -0.192822 160.694478 -34.275816 15.555756

2457357028.960266 -30.566130 -160.978173 -0.201637 156.109425 -0.195571 156.089533 -34.044506 8.331749

2514647559.185594 -30.654376 -163.493462 -0.202645 151.350193 -0.195381 151.336136 -33.871825 2.995640

2573273754.035484 -30.868012 -167.269004 -0.201011 146.492195 -0.199719 146.482637 -33.560073 -3.085006

2633266753.036525 -30.504435 -174.012549 -0.208266 141.533091 -0.201261 141.478510 -32.905976 -9.045197

2694658421.698535 -30.565645 -179.635901 -0.213505 136.435012 -0.206057 136.409120 -32.473140 -17.052285

2757481368.440050 -30.888540 178.123883 -0.212627 131.244547 -0.206352 131.171938 -32.817005 -22.286160

2821768961.908402 -31.000935 173.076123 -0.216103 125.922630 -0.207124 125.858070 -32.522002 -29.243728

2887555348.703612 -30.820364 164.663900 -0.216900 120.465559 -0.214475 120.405217 -31.889321 -37.253951

2954875471.515481 -31.194821 157.495083 -0.222818 114.879439 -0.217917 114.825549 -31.703250 -42.176641

3023765087.683534 -31.613614 154.780887 -0.224451 109.162326 -0.218786 109.121034 -31.941295 -48.431775

3094260788.189668 -31.796838 146.311906 -0.226799 103.305582 -0.224308 103.266298 -31.457066 -56.483986

3166400017.093591 -31.937066 139.710902 -0.231513 97.343919 -0.225841 97.298244 -31.292167 -62.802144

3240221091.421377 -32.735810 136.690560 -0.229408 91.225431 -0.226339 91.187290 -31.803209 -68.565004

3315763221.517697 -32.788337 127.148230 -0.234935 84.975796 -0.232753 84.906730 -31.708453 -77.299513

3393066531.872549 -33.014330 119.823287 -0.242433 78.548909 -0.237244 78.516779 -31.108277 -85.015548

3472172082.433529 -34.005375 113.845028 -0.240921 71.997363 -0.237719 71.959359 -31.855179 -90.700221

3553121890.414979 -34.816189 103.990424 -0.244164 65.290197 -0.240996 65.246553 -32.001168 -98.192167

3635958952.615593 -35.105861 94.193941 -0.246572 58.422508 -0.242729 58.387463 -31.806572 -106.082540

3720727268.256326 -36.503975 88.649973 -0.249350 51.414339 -0.246198 51.364288 -32.772003 -112.053147

3807471862.350752 -37.228873 78.216506 -0.256868 44.217344 -0.244479 44.167759 -33.099110 -120.642460

3896238809.620269 -37.544174 66.083577 -0.253101 36.850849 -0.245735 36.806509 -33.192652 -128.417644

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6321668840.866945 -25.835170 -58.476787 -0.330668 -164.240450 -0.327882 -164.265167 -26.752500 -97.664878

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6619870176.858158 -25.364054 -84.427633 -0.338164 171.041972 -0.339505 171.032422 -26.232417 -120.500485

6774205044.761139 -24.948364 -98.914889 -0.341380 158.272547 -0.341366 158.242604 -26.023987 -132.326935

6932138057.463680 -25.182014 -113.673081 -0.344893 145.199786 -0.343842 145.162774 -26.269667 -142.490968

7093753101.686746 -25.596734 -128.228310 -0.346129 131.803051 -0.344261 131.778055 -26.961542 -154.648383

7259136019.876357 -26.041636 -146.702019 -0.345153 118.095800 -0.345595 118.076780 -27.842369 -164.628043

90 InfiniiMax III Series Probes User’s Guide

Page 91

Performance Verification 6

7428374655.799140 -27.017620 -164.842451 -0.348642 104.090333 -0.350091 104.061237 -28.919257 -172.662528

7601558901.200872 -28.551834 174.443449 -0.347845 89.718285 -0.349058 89.706641 -31.030126 -178.119157

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9571749387.614246 -26.714829 -88.237234 -0.410414 -73.575672 -0.405640 -73.594043 -27.471766 127.264105

9794904017.217421 -27.784409 -102.254518 -0.413424 -92.036107 -0.405178 -92.065913 -29.288726 106.168277

10023261247.379461 -29.946849 -113.393625 -0.415196 -110.952968 -0.410031 -111.004263 -32.941982 80.431768

10256942370.912546 -33.467963 -111.933273 -0.416094 -130.366719 -0.415555 -130.393886 -39.546464 35.419669

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10740775674.298862 -31.594934 -55.582996 -0.430726 -170.525020 -0.427623 -170.564105 -31.250912 -133.959009

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11247432023.481905 -24.270939 -69.126451 -0.456322 147.439024 -0.449060 147.371764 -23.920976 172.437459

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11777988011.196802 -20.892091 -104.819406 -0.485741 103.505487 -0.482557 103.398888 -20.621755 123.860148

12052578626.315733 -19.912105 -123.956104 -0.503675 80.788596 -0.495872 80.740772 -19.692077 98.664504

12333571014.457333 -19.497816 -147.212200 -0.508376 57.572177 -0.509731 57.482576 -19.471600 76.401941

12621114425.798326 -19.543071 -170.672396 -0.512781 33.789680 -0.504274 33.733344 -19.628177 53.134740

12915361590.116354 -19.992728 160.959326 -0.511246 9.447349 -0.501680 9.367454 -20.266146 34.221120

13216468797.912968 -20.711590 126.547146 -0.502591 -15.541526 -0.499251 -15.576244 -21.010230 19.709050

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14830635531.310724 -16.058479 -85.299362 -0.618100 -149.484635 -0.618535 -149.541717 -16.084639 -35.440127

15176395208.538778 -15.236915 -119.431135 -0.647631 -177.960047 -0.644491 -178.030288 -15.352338 -57.340933

15530215885.859812 -15.065709 -154.592735 -0.660264 153.014482 -0.658133 153.003053 -15.173200 -80.159018

15892285496.473612 -15.566862 168.702105 -0.644811 123.213682 -0.635579 123.149684 -15.854211 -100.792741

16262796355.032291 -17.185189 128.943209 -0.612713 92.711057 -0.605704 92.642379 -17.351408 -121.539091

16641945259.788942 -19.517598 79.609952 -0.586104 61.195419 -0.579928 61.155659 -19.345649 -133.056375

17029933597.127781 -22.052969 14.417418 -0.567689 28.875945 -0.564626 28.806397 -21.149985 -133.824999

17426967448.531292 -21.630443 -59.992319 -0.583576 -4.158770 -0.574743 -4.255992 -20.911414 -131.946593

17833257700.041199 -19.673154 -120.894595 -0.601843 -37.884863 -0.593646 -37.981253 -19.659181 -138.614133

18249020154.271370 -18.806881 -174.276372 -0.618695 -72.289682 -0.609299 -72.420566 -18.994739 -153.494312

18674475645.032219 -19.178945 134.206183 -0.619021 -107.527664 -0.614326 -107.586015 -19.447309 -168.513987

19109850154.627415 -19.950051 73.371028 -0.618376 -143.565386 -0.611954 -143.651099 -20.065279 179.863710

19555374933.885239 -20.409308 7.727679 -0.619886 179.407608 -0.622828 179.396896 -20.470586 169.575271

20011286624.988346 -19.579681 -58.016432 -0.626351 141.642169 -0.628446 141.549209 -20.272460 158.551078

20477827387.167168 -19.235856 -115.281184 -0.639397 102.910502 -0.637766 102.864098 -20.495114 142.323830

20955245025.323700 -20.044807 -172.267159 -0.636528 63.319590 -0.622112 63.277382 -21.696936 125.790595

21443793121.654022 -21.683487 128.397837 -0.638893 22.760432 -0.630205 22.758924 -22.470371 115.132339

21943731170.339451 -23.474823 60.110496 -0.639381 -18.730062 -0.644866 -18.828618 -22.521536 100.916605

22455324715.377853 -25.165813 -9.497241 -0.659748 -61.201745 -0.649063 -61.248669 -22.485450 79.355738

22978845491.628361 -27.550912 -68.306165 -0.654315 -104.664654 -0.654273 -104.699819 -24.370615 45.962002

23514571569.144375 -38.154103 -108.867665 -0.659796 -149.285435 -0.654825 -149.301469 -32.362011 14.707828

24062787500.871529 -26.705129 3.489938 -0.664487 164.941804 -0.673097 164.975383 -29.551453 127.286232

24623784473.789066 -19.960691 -37.343281 -0.709519 118.324966 -0.711951 118.268423 -20.876395 83.706187

25197860463.574921 -17.075968 -82.581482 -0.762437 70.800631 -0.752851 70.658498 -17.644528 33.508342

25785320392.876629 -16.389933 -129.665074 -0.773976 22.251711 -0.785924 22.378393 -17.091366 -14.641963

26386476293.272152 -17.740325 170.336058 -0.751568 -27.464393 -0.745351 -27.641774 -19.396216 -54.587976

27001647471.006645 -20.441710 86.953452 -0.707798 -78.927817 -0.688728 -78.963080 -22.786124 -65.976014

27631160676.593178 -18.708938 -4.202202 -0.758800 -131.434860 -0.766884 -131.560447 -19.566558 -71.685007

28275350278.367512 -16.258572 -68.478347 -0.826408 175.068642 -0.822329 175.113490 -17.059431 -116.230704

28934558440.089119 -17.148103 -113.353816 -0.822544 120.550907 -0.825989 120.585659 -18.527425 177.493812

29609135302.682766 -19.586442 -134.578145 -0.785243 64.443280 -0.793101 64.316744 -22.070782 76.512077

30299439170.217197 -17.742592 -148.982049 -0.825947 6.809963 -0.812757 6.969945 -18.819692 -28.285789

31005836700.219704 -16.903313 155.292062 -0.824193 -51.457599 -0.858126 -51.738834 -17.800752 -87.794210

31728703098.427670 -18.748424 57.068278 -0.801196 -112.022259 -0.836282 -112.293270 -20.219688 -105.626698

32468422318.080524 -14.659329 -55.335061 -0.919360 -174.054710 -0.905470 -174.339069 -15.122997 -111.544467

33225387263.857967 -11.577429 -135.909942 -1.104865 123.781065 -1.105881 123.849957 -12.199337 -156.048844

34000000000.000000 -13.297830 149.794119 -1.023492 60.693197 -1.035722 60.797201 -13.786461 155.311288

InfiniiMax III Series Probes User’s Guide 91

Page 92

6 Performance Verification

NOTE

Touchstone File (5062-1247 & N5477A)

Cut and paste the following text and save in an text file named Adapter_5062_1247___Adapter_N5477A.s2p. This file is used in Step 11 on page 82.

! freq S11 S21 S12 S22 !Port 1=female side of 5062_1247 adaptor, Port 2=male side of N5477A # Hz S DB R 50

50000000.000000 -41.543761 18.199382 -0.015231 -10.158056 -0.028545 -10.064176 -41.019132 74.184681

51165694.067857 -41.582558 18.207470 -0.015602 -10.384282 -0.028789 -10.293624 -41.089383 73.495272

52358564.988911 -41.622441 18.215746 -0.015982 -10.615782 -0.029040 -10.528422 -41.161865 72.789791

53579246.361093 -41.663443 18.224215 -0.016371 -10.852680 -0.029296 -10.768693 -41.236668 72.067861

54828386.553961 -41.705603 18.232881 -0.016769 -11.095100 -0.029558 -11.014566 -41.313888 71.329101

56106649.053084 -41.748959 18.241750 -0.017177 -11.343172 -0.029827 -11.266171 -41.393626 70.573118

57414712.812455 -41.793551 18.250825 -0.017593 -11.597028 -0.030101 -11.523642 -41.475987 69.799509

58753272.615119 -41.839421 18.260112 -0.018020 -11.856802 -0.030382 -11.787116 -41.561085 69.007865

60123039.442212 -41.886612 18.269615 -0.018457 -12.122633 -0.030670 -12.056732 -41.649039 68.197764

61524740.850598 -41.935170 18.279340 -0.018903 -12.394661 -0.030964 -12.332635 -41.739975 67.368777

62959121.359318 -41.985143 18.289291 -0.019360 -12.673031 -0.031266 -12.614969 -41.834027 66.520463

64426942.845040 -42.036581 18.299475 -0.019828 -12.957891 -0.031574 -12.903886 -41.931338 65.652372

65928984.946733 -42.089534 18.309896 -0.020307 -13.249392 -0.031889 -13.199539 -42.032060 64.764041

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70648506.535956 -42.258052 18.342639 -0.021812 -14.165309 -0.032881 -14.128500 -42.356354 61.972846

72295597.435395 -42.317642 18.354067 -0.022337 -14.484960 -0.033227 -14.452703 -42.472443 60.998732

73981088.416647 -42.379047 18.365760 -0.022874 -14.812063 -0.033581 -14.784464 -42.592867 60.001907

75705874.734666 -42.442337 18.377727 -0.023424 -15.146792 -0.033943 -15.123961 -42.717851 58.981843

77470872.516269 -42.507583 18.389972 -0.023987 -15.489325 -0.034314 -15.471372 -42.847639 57.937997

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93155686.478363 -43.109997 18.498792 -0.028990 -18.533275 -0.037609 -18.558673 -44.095114 48.661763

95327507.100664 -43.196804 18.513859 -0.029683 -18.954760 -0.038066 -18.986161 -44.282882 47.377316

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112016060.248099 -43.230264 15.350329 -0.033426 -22.213520 -0.040040 -22.249242 -44.594230 40.742270

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117300003.406038 -43.162416 13.944943 -0.034416 -23.247775 -0.040477 -23.279719 -44.547622 39.039744

120034721.768639 -43.127508 13.217582 -0.034929 -23.783057 -0.040703 -23.813045 -44.523598 38.158598

122833197.030691 -43.091931 12.473263 -0.035454 -24.330818 -0.040934 -24.358805 -44.499082 37.256908

125696915.612984 -43.055675 11.711592 -0.035990 -24.891349 -0.041170 -24.917289 -44.474067 36.334197

128627398.590544 -43.018729 10.932162 -0.036540 -25.464949 -0.041413 -25.488793 -44.448542 35.389973

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134694920.169152 -42.942730 9.318366 -0.037677 -26.652579 -0.041914 -26.672084 -44.395931 33.434973

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141048654.627056 -42.863852 7.628444 -0.038869 -27.896230 -0.042439 -27.911192 -44.341178 31.387752

144337046.226616 -42.823309 6.753821 -0.039486 -28.539885 -0.042711 -28.552495 -44.312975 30.328208

147702102.997784 -42.782014 5.858807 -0.040117 -29.198546 -0.042989 -29.208750 -44.284210 29.243962

151145612.303275 -42.761443 4.946541 -0.040680 -29.873082 -0.043283 -29.881319 -44.250154 28.088307

154669403.176167 -42.784598 4.020426 -0.041087 -30.564410 -0.043606 -30.571648 -44.205805 26.811021

158275347.291397 -42.808357 3.072719 -0.041503 -31.271854 -0.043936 -31.278072 -44.160655 25.503957

161965359.959910 -42.832738 2.102918 -0.041930 -31.995792 -0.044274 -32.000965 -44.114694 24.166420

165741401.145982 -42.857758 1.110506 -0.042366 -32.736608 -0.044619 -32.740712 -44.067912 22.797700

169605476.508267 -42.883436 0.094958 -0.042812 -33.494695 -0.044973 -33.497705 -44.020299 21.397070

173559638.465103 -42.909791 -0.944266 -0.043269 -34.270456 -0.045335 -34.272347 -43.971845 19.963785

177605987.284668 -42.936844 -2.007719 -0.043736 -35.064303 -0.045706 -35.065048 -43.922539 18.497086

181746672.200541 -42.964615 -3.095965 -0.044215 -35.876657 -0.046085 -35.876231 -43.872372 16.996191

185983892.553281 -42.993126 -4.209583 -0.044704 -36.707951 -0.046473 -36.706325 -43.821333 15.460305

190319898.958608 -43.022399 -5.349163 -0.045205 -37.558626 -0.046870 -37.555772 -43.769413 13.888612

194756994.502833 -43.052457 -6.515311 -0.045718 -38.429133 -0.047276 -38.425023 -43.716602 12.280276

199297535.966146 -43.083324 -7.708646 -0.046242 -39.319934 -0.047692 -39.314540 -43.662891 10.634444

92 InfiniiMax III Series Probes User’s Guide

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203943935.074433 -43.103278 -8.572691 -0.046521 -40.231587 -0.047866 -40.222535 -43.632839 9.181011

208698659.780268 -43.121602 -9.391791 -0.046759 -41.164509 -0.047999 -41.151288 -43.606664 7.735754

213564235.573780 -43.140393 -10.229988 -0.047002 -42.119181 -0.048134 -42.101693 -43.579961 6.256803

218543246.824077 -43.159664 -11.087726 -0.047251 -43.096110 -0.048273 -43.074256 -43.552719 4.743372

223638338.151939 -43.179428 -11.965461 -0.047506 -44.095815 -0.048415 -44.069494 -43.524931 3.194656

228852215.834522 -43.199700 -12.863660 -0.047767 -45.118827 -0.048560 -45.087934 -43.496586 1.609835

234187649.242808 -43.220494 -13.782799 -0.048034 -46.165690 -0.048709 -46.130118 -43.467676 -0.011936

239647472.312564 -43.241824 -14.723367 -0.048307 -47.236959 -0.048861 -47.196599 -43.438192 -1.671516

245234585.049599 -43.263706 -15.685864 -0.048586 -48.333203 -0.049017 -48.287944 -43.408123 -3.369787

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288166688.601492 -43.940602 -23.514255 -0.055563 -56.756161 -0.051379 -56.704061 -43.170452 -13.068000

294884972.590629 -44.061804 -24.747740 -0.056750 -58.074224 -0.051771 -58.021656 -43.133646 -14.520153

301759885.855612 -44.185888 -26.135617 -0.057555 -59.421903 -0.052216 -59.369819 -43.118534 -16.493975

308795080.032796 -44.309538 -27.929515 -0.057159 -60.797690 -0.052799 -60.748967 -43.169916 -19.964677

315994291.892351 -44.437919 -29.765235 -0.056755 -62.205552 -0.053395 -62.160270 -43.222813 -23.516294

323361345.323065 -44.571288 -31.643752 -0.056341 -63.646238 -0.054006 -63.604475 -43.277279 -27.150714

330900153.363414 -44.709920 -33.566066 -0.055917 -65.120511 -0.054631 -65.082350 -43.333371 -30.869866

338614720.279990 -44.854113 -35.533196 -0.055484 -66.629155 -0.055271 -66.594680 -43.391147 -34.675726

346509143.694381 -45.004188 -37.546187 -0.055040 -68.172971 -0.055925 -68.142268 -43.450671 -38.570315

354587616.759638 -45.081293 -39.640674 -0.055604 -69.757085 -0.056555 -69.729596 -43.443565 -41.682121

362854430.387485 -45.099174 -41.810905 -0.056974 -71.381482 -0.057168 -71.356781 -43.383418 -44.186244

371313975.527454 -45.117511 -44.031733 -0.058376 -73.043750 -0.057795 -73.021901 -43.322297 -46.748747

379970745.499151 -45.136315 -46.304337 -0.059811 -74.744773 -0.058437 -74.725842 -43.260193 -49.370992

388829338.378905 -45.155600 -48.629924 -0.061279 -76.485452 -0.059094 -76.469508 -43.197098 -52.054371

397894459.442048 -45.175378 -51.009730 -0.062782 -78.266714 -0.059766 -78.253826 -43.133002 -54.800311

407170923.662146 -45.439394 -54.125157 -0.063410 -80.086549 -0.060112 -80.070659 -43.191536 -58.298819

416663658.268484 -45.795170 -57.517576 -0.063779 -81.947923 -0.060362 -81.927120 -43.289602 -62.085778

426377705.363190 -46.174984 -60.989085 -0.064156 -83.852693 -0.060617 -83.826862 -43.391114 -65.961025

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446490495.921630 -47.018494 -68.176794 -0.064938 -87.796491 -0.061147 -87.760251 -43.605141 -73.984668

456899922.370640 -47.449942 -71.123890 -0.065692 -89.836182 -0.062537 -89.798743 -43.791267 -78.341637

467552032.952879 -47.893175 -73.737398 -0.066647 -91.922680 -0.064540 -91.886196 -44.025196 -82.906526

478452485.577434 -48.371442 -76.411838 -0.067623 -94.057823 -0.066590 -94.022315 -44.271284 -87.577840

489607070.061218 -48.889746 -79.148628 -0.068623 -96.242744 -0.068688 -96.208235 -44.530542 -92.358060

501021711.204246 -49.429340 -82.184197 -0.069634 -98.479232 -0.070689 -98.445619 -44.777030 -97.275465

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630877734.387229 -52.519331 -170.809623 -0.081727 -123.929528 -0.079783 -123.900931 -44.252324 -163.825029

645585943.037598 -52.489382 172.734390 -0.083162 -126.807198 -0.080961 -126.785213 -44.233584 -172.473039

660637057.119418 -51.781446 161.510155 -0.083923 -129.753281 -0.081531 -129.727470 -44.043176 179.347615

676039071.089234 -50.859704 152.408790 -0.084403 -132.768611 -0.081843 -132.734386 -43.782386 171.262207

691800165.785404 -50.007957 143.095237 -0.084894 -135.854241 -0.082163 -135.811404 -43.523383 162.988298

707928712.773379 -48.766921 134.683084 -0.085645 -139.013922 -0.083172 -138.971241 -43.053869 155.444490

724433278.792294 -47.259915 127.258563 -0.086676 -142.249505 -0.084926 -142.216471 -42.390284 148.701623

741322630.305226 -45.948345 119.660947 -0.087732 -145.560522 -0.086720 -145.537361 -41.759953 141.801553

758605738.155530 -44.885494 112.469120 -0.088693 -148.944903 -0.087887 -148.931823 -41.324099 134.506312

776291782.331738 -44.012274 105.711097 -0.089553 -152.404239 -0.088389 -152.401450 -41.064924 126.799230

794390156.843548 -43.201219 98.795518 -0.090434 -155.944224 -0.088903 -155.951967 -40.807479 118.912465

812910474.711483 -42.732197 93.951637 -0.091013 -159.575197 -0.090377 -159.573400 -40.153097 111.436395

831862573.072888 -42.402116 89.987695 -0.091462 -163.294582 -0.092307 -163.273988 -39.371111 104.050402

851256518.406959 -42.045190 85.958163 -0.091960 -167.100407 -0.094131 -167.061891 -38.654851 96.647804

871102611.881596 -41.257433 82.230919 -0.093043 -170.990913 -0.093748 -170.953476 -38.216007 91.370876

891411394.824904 -40.519077 78.416778 -0.094151 -174.972122 -0.093356 -174.935789 -37.788771 85.970922

912193654.324260 -39.947796 74.635399 -0.095791 -179.045015 -0.093454 -179.005308 -37.311342 79.558279

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955223014.648186 -39.042248 66.913443 -0.099604 172.525625 -0.094593 172.573587 -36.334837 65.552112

977492970.681309 -38.632476 62.654221 -0.100376 168.169927 -0.095959 168.202315 -35.923312 60.417459

1000282125.827218 -38.230015 58.285954 -0.101180 163.712604 -0.097355 163.729255 -35.523038 55.150470

1023602584.632427 -37.663767 53.020225 -0.103075 159.145167 -0.098627 159.161967 -35.256252 48.729884

1047466733.847416 -37.120172 47.631732 -0.105015 154.471246 -0.099928 154.488197 -34.991473 42.159608

1071887249.005892 -36.904667 42.777190 -0.105853 149.692284 -0.100278 149.711962 -34.732623 35.894172

1096877101.157453 -36.725795 37.887590 -0.106574 144.802370 -0.100520 144.825144 -34.475950 29.536912

1122449563.757208 -36.466047 34.944479 -0.108067 139.791216 -0.102302 139.813052 -34.231961 23.929102

1148618219.716024 -36.196991 32.226064 -0.109702 134.662203 -0.104345 134.682493 -33.990713 18.318334

1175396968.615140 -35.744396 26.836257 -0.108458 129.416707 -0.104734 129.450221 -33.705583 11.790557

1202800034.088982 -35.313900 21.309312 -0.107557 124.050224 -0.105270 124.093967 -33.451837 5.206736

Performance Verification 6

InfiniiMax III Series Probes User’s Guide 93

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6 Performance Verification

1230841971.380104 -35.060434 16.855880 -0.111443 118.568821 -0.107905 118.585920 -33.475859 -0.272518

1259537675.070255 -34.828362 11.895752 -0.113822 112.954191 -0.109121 112.956285 -33.427845 -6.326649

1288902386.991699 -34.637028 5.991891 -0.112972 107.197490 -0.107321 107.209433 -33.232324 -13.441007

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1381168370.560588 -34.493597 -8.679569 -0.118776 89.117643 -0.113622 89.133122 -33.410081 -33.333905

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1549854581.005252 -34.701874 -37.252563 -0.123607 56.083312 -0.114573 56.121837 -34.665369 -64.847296

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1821180574.231843 -37.484598 -86.868733 -0.131161 2.947295 -0.127626 2.975836 -41.148115 -86.127153

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1907088029.049217 -39.704615 -104.094238 -0.135075 -13.895484 -0.128468 -13.856227 -42.449078 -75.237556

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2140006375.184037 -48.734550 167.249791 -0.140935 -59.471724 -0.136923 -59.481997 -37.011044 -67.311912

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2240953257.435161 -47.248780 102.425235 -0.145189 -79.250248 -0.144564 -79.241460 -35.480901 -81.284556

2293198575.805914 -45.916756 77.146501 -0.148777 -89.476920 -0.144941 -89.462778 -34.813532 -87.500030

2346661935.330630 -43.767921 61.261587 -0.150670 -99.974920 -0.145833 -99.944111 -34.501253 -99.729227

2401371733.276259 -42.463098 53.389823 -0.153049 -110.669793 -0.150102 -110.612547 -34.114911 -108.958317

2457357028.960266 -41.354489 38.467807 -0.155084 -121.637914 -0.151633 -121.612261 -34.137466 -121.379437

2514647559.185594 -40.436504 25.611295 -0.158069 -132.847241 -0.151828 -132.823699 -34.266445 -134.765994

2573273754.035484 -39.766828 18.832417 -0.158548 -144.322623 -0.155348 -144.309069 -34.749185 -149.222090

2633266753.036525 -39.585368 13.007383 -0.161523 -156.077438 -0.156830 -156.037211 -35.273691 -163.661704

2694658421.698535 -39.397286 4.998523 -0.159431 -168.064537 -0.156978 -168.048778 -36.249962 178.210754

2757481368.440050 -39.422884 2.583521 -0.164647 179.606122 -0.161087 179.631849 -37.343959 156.503655

2821768961.908402 -39.133671 -1.474377 -0.165444 167.036538 -0.164382 167.048923 -38.494994 130.057288

2887555348.703612 -38.388380 -4.523180 -0.168657 154.149644 -0.165126 154.164327 -39.096794 99.094444

2954875471.515481 -37.787643 -4.617903 -0.169225 140.976795 -0.165129 141.007201 -38.625927 64.598987

3023765087.683534 -36.875824 -8.969005 -0.171385 127.493385 -0.169053 127.511088 -37.890176 34.994037

3094260788.189668 -36.216647 -13.798505 -0.173015 113.691192 -0.174147 113.698220 -36.793209 7.064576

3166400017.093591 -35.651970 -21.835071 -0.176812 99.584048 -0.173930 99.596883 -35.578155 -16.335957

3240221091.421377 -34.924153 -29.739661 -0.178530 85.137293 -0.174794 85.135728 -34.636476 -39.192361

3315763221.517697 -34.371780 -39.111948 -0.178952 70.348390 -0.180558 70.365435 -34.150715 -59.522549

3393066531.872549 -34.244780 -48.607695 -0.178870 55.208829 -0.179892 55.230806 -33.826686 -80.323358

3472172082.433529 -34.476531 -59.453308 -0.183218 39.713665 -0.183211 39.733623 -34.138716 -99.007436

3553121890.414979 -35.069284 -70.260945 -0.184614 23.861752 -0.180719 23.909153 -34.828587 -117.828641

3635958952.615593 -36.283609 -81.812327 -0.184275 7.644632 -0.180090 7.685282 -36.257912 -139.370587

3720727268.256326 -38.162718 -87.585475 -0.184604 -8.946980 -0.185385 -8.925870 -38.684389 -166.652649

3807471862.350752 -40.807807 -83.624174 -0.186601 -25.932133 -0.187600 -25.905716 -42.455757 159.411784

3896238809.620269 -43.193297 -60.961268 -0.193428 -43.307675 -0.187482 -43.257933 -46.653312 90.599430

3987075258.966864 -41.010692 -45.870784 -0.192793 -61.094137 -0.188944 -61.067789 -44.235095 52.859891

4080029458.516430 -40.640132 -46.745109 -0.195417 -79.294262 -0.192825 -79.239295 -41.447195 24.466944

4175150781.245943 -38.862843 -45.743393 -0.196459 -97.911409 -0.196690 -97.879002 -40.217427 -8.187401

4272489751.208107 -36.901436 -57.021625 -0.197539 -116.965239 -0.195362 -116.930236 -39.646265 -34.990548

4372098070.367394 -35.754995 -70.526291 -0.199881 -136.476532 -0.195821 -136.437388 -39.888195 -54.415059

4474028646.061748 -34.768135 -88.344260 -0.202932 -156.426049 -0.201514 -156.396163 -40.126155 -68.932475

4578335619.104504 -34.589201 -113.863738 -0.205685 -176.847719 -0.202715 -176.810316 -41.227346 -83.843172

4685074392.541502 -34.676254 -139.241331 -0.211360 162.242319 -0.208298 162.288449 -42.127595 -77.657016

4794301661.078618 -35.009711 -167.056395 -0.208190 140.882701 -0.211724 140.909739 -40.683233 -70.276328

4906075441.195374 -35.241565 161.502337 -0.212061 118.955675 -0.212176 119.028308 -37.580008 -76.725099

5020455101.960610 -35.513550 128.004279 -0.216533 96.594504 -0.215281 96.645052 -35.185725 -95.538795

5137501396.566599 -35.393085 94.566784 -0.214484 73.696066 -0.216346 73.726641 -33.437199 -116.996864

5257276494.598325 -34.759185 66.761912 -0.223346 50.235591 -0.218980 50.273219 -32.207469 -144.391698

5379844015.055103 -34.104308 41.999152 -0.225775 26.257286 -0.222288 26.280343 -31.325470 -175.202148

5505269060.142051 -33.821033 20.752159 -0.226444 1.696124 -0.225462 1.744810 -31.006498 153.013134

5633618249.849370 -32.907214 4.908341 -0.228139 -23.446243 -0.227634 -23.400351 -30.489983 118.327948

5764959757.337812 -32.412124 -14.640849 -0.233975 -49.138791 -0.228578 -49.112934 -30.493602 81.228288

5899363345.149107 -31.213151 -32.479317 -0.237805 -75.464072 -0.233467 -75.411570 -30.281297 45.729291

6036900402.260610 -30.599298 -55.519768 -0.240676 -102.379635 -0.235149 -102.335755 -30.177145 12.665458

6177643982.003820 -30.221873 -79.064439 -0.240071 -129.916937 -0.241158 -129.891246 -30.674387 -17.821421

6321668840.866945 -30.158087 -105.894970 -0.242774 -158.110579 -0.240547 -158.085414 -31.502689 -42.731734

6469051478.202085 -30.450458 -134.916128 -0.241951 173.049026 -0.242164 173.068568 -32.526933 -62.970419

6619870176.858158 -31.320042 -167.491708 -0.245335 143.495903 -0.244212 143.553909 -33.370066 -75.705119

6774205044.761139 -32.297218 155.620110 -0.249495 113.283076 -0.249397 113.324001 -32.979023 -87.930712

6932138057.463680 -33.984328 116.489962 -0.257361 82.365393 -0.251266 82.415968 -32.117657 -107.800948

7093753101.686746 -34.938882 77.018794 -0.256225 50.738206 -0.258156 50.771589 -31.608079 -134.719679

7259136019.876357 -36.441402 42.392469 -0.258712 18.366898 -0.257551 18.402423 -31.746710 -170.514601

94 InfiniiMax III Series Probes User’s Guide

Page 95

Performance Verification 6

7428374655.799140 -37.293649 14.340553 -0.263882 -14.759133 -0.258908 -14.695756 -32.761639 143.058679

7601558901.200872 -36.907940 3.855324 -0.267100 -48.660334 -0.266499 -48.613209 -33.766269 86.068082

7778780743.552826 -35.828061 -13.657090 -0.271380 -83.387048 -0.266894 -83.289164 -33.270815 21.805711

7960134314.911269 -33.493068 -37.569054 -0.271134 -118.872118 -0.273741 -118.805162 -31.780351 -32.970164

8145715941.916058 -32.118290 -70.028402 -0.275567 -155.198803 -0.273571 -155.161065 -30.962180 -79.289275

8335624196.954902 -31.894002 -107.235305 -0.277590 167.618358 -0.275756 167.679923 -31.479945 -118.300978

8529959950.520464 -32.709673 -149.757670 -0.279359 129.577007 -0.279958 129.627666 -33.271908 -152.082983

8728826424.788105 -34.055029 170.816461 -0.278450 90.627878 -0.278118 90.672620 -35.491196 -170.796459

8932329248.442736 -36.258756 128.748237 -0.282665 50.786153 -0.283395 50.827135 -35.932918 176.041429

9140576512.783896 -36.732617 92.598448 -0.285237 9.972934 -0.285945 10.039086 -34.847845 146.764188

9353678829.138855 -36.232488 61.014514 -0.289335 -31.720162 -0.289564 -31.670633 -34.307010 92.427431

9571749387.614246 -35.087275 25.123510 -0.293625 -74.424410 -0.293981 -74.329573 -34.448660 29.777906

9794904017.217421 -35.866841 -16.830593 -0.297243 -118.070354 -0.295732 -118.017380 -34.561003 -43.260195

10023261247.379461 -40.371336 -58.565056 -0.299652 -162.808725 -0.298000 -162.714229 -35.356462 -128.009378

10256942370.912546 -47.858119 8.883051 -0.301757 151.432559 -0.301873 151.505185 -34.497053 135.597672

10496071508.435085 -36.622941 4.554259 -0.307021 104.591699 -0.306216 104.665149 -31.849678 54.509330

10740775674.298862 -32.971346 -43.725031 -0.310831 56.700025 -0.310562 56.745140 -31.110504 -17.560468

10991184844.053186 -34.021301 -98.567108 -0.311071 7.658483 -0.313540 7.726542 -33.136970 -86.070846

11247432023.481905 -39.993838 -168.509597 -0.310230 -42.516342 -0.312171 -42.442511 -41.798286 171.688717

11509653319.249928 -50.076241 -3.651648 -0.317472 -93.894268 -0.319884 -93.812161 -36.457406 31.607998

11777988011.196802 -39.760612 -111.165462 -0.320336 -146.478896 -0.319876 -146.401224 -34.479967 -29.533247

12052578626.315733 -34.421795 142.154319 -0.322845 159.728999 -0.321560 159.765128 -39.573202 -22.198166

12333571014.457333 -28.527502 57.480125 -0.331446 104.628713 -0.331240 104.726450 -29.076002 -13.943374

12621114425.798326 -25.458389 -15.363700 -0.345952 48.348568 -0.344764 48.406678 -24.185101 -64.550120

12915361590.116354 -25.537326 -84.720027 -0.350982 -9.171222 -0.350894 -9.126921 -23.914883 -122.687993

13216468797.912968 -29.497841 -161.321749 -0.341054 -68.157091 -0.337756 -68.086689 -28.496513 175.818802

13524595983.427933 -37.523983 86.570049 -0.335982 -128.574086 -0.340256 -128.512309 -48.380436 -166.259847

13839906809.588905 -38.684722 -47.834989 -0.346287 169.594823 -0.339239 169.687215 -32.352399 -154.247275

14162568754.941620 -45.875328 -112.341572 -0.344358 106.400526 -0.343395 106.422508 -31.414879 112.460071

14492753202.606752 -38.541178 -66.509388 -0.351636 41.632441 -0.348299 41.699006 -31.751305 -6.751484

14830635531.310724 -34.024503 -135.325388 -0.356319 -24.549915 -0.359061 -24.467266 -31.213945 -112.794665

15176395208.538778 -34.741710 147.020941 -0.355504 -92.320829 -0.355349 -92.263858 -34.766455 150.931616

15530215885.859812 -35.300395 87.230844 -0.357092 -161.686627 -0.354720 -161.661329 -41.363027 107.616521

15892285496.473612 -30.792606 28.600758 -0.365286 127.262506 -0.357217 127.348334 -30.829188 78.555766

16262796355.032291 -27.166721 -58.757340 -0.374921 54.662998 -0.370241 54.704425 -24.529908 6.247539

16641945259.788942 -26.763536 -160.007113 -0.384264 -19.616642 -0.380796 -19.558669 -25.302166 -67.497161

17029933597.127781 -28.644756 87.146320 -0.372689 -95.667199 -0.369029 -95.638847 -36.512177 -114.107070

17426967448.531292 -47.848604 -54.576713 -0.375307 -173.611851 -0.371314 -173.536994 -32.117741 -37.192426

17833257700.041199 -25.373848 77.107861 -0.381565 106.681389 -0.381826 106.752623 -26.695748 -57.166454

18249020154.271370 -21.671814 -12.233474 -0.399919 25.179522 -0.406146 25.266365 -22.459690 -107.844721

18674475645.032219 -26.742937 -85.593837 -0.395158 -58.204220 -0.395133 -58.095952 -24.909696 162.854364

19109850154.627415 -28.414119 -65.676430 -0.397429 -143.696471 -0.389362 -143.605337 -27.890896 -19.577772

19555374933.885239 -24.586218 -144.108105 -0.414361 128.893776 -0.407288 129.005005 -22.618008 -141.317301

20011286624.988346 -26.045948 105.213101 -0.402389 39.501393 -0.389836 39.614344 -25.938526 122.482384

20477827387.167168 -25.898538 12.536934 -0.388736 -52.130474 -0.375999 -52.034114 -30.307011 51.901194

20955245025.323700 -25.863619 -61.341207 -0.403561 -145.804189 -0.393551 -145.786077 -26.672025 -32.965204

21443793121.654022 -31.243910 -92.221920 -0.402312 118.118322 -0.396327 118.261313 -31.028754 -177.176860

21943731170.339451 -23.158869 -142.365828 -0.443013 19.867220 -0.432500 19.917340 -22.801909 8.354422

22455324715.377853 -20.480757 91.146321 -0.465176 -80.436626 -0.462656 -80.272536 -20.450127 -78.156390

22978845491.628361 -23.350751 -42.524375 -0.439231 176.888332 -0.437659 176.972824 -24.720232 -132.556294

23514571569.144375 -29.096385 25.034429 -0.434284 71.509130 -0.415904 71.569311 -29.744440 -88.823584

24062787500.871529 -20.867025 -106.511416 -0.473044 -36.135123 -0.451251 -36.183006 -20.573606 -144.546395

24623784473.789066 -26.684148 130.707972 -0.463478 -146.321169 -0.428301 -146.096394 -24.004558 127.818009

25197860463.574921 -31.160196 61.734789 -0.446323 100.735661 -0.410981 100.913010 -39.408221 -29.991332

25785320392.876629 -25.533397 -17.272853 -0.440480 -14.729362 -0.438068 -14.647444 -26.709420 161.061882

26386476293.272152 -22.711245 -101.871135 -0.471170 -133.063592 -0.457863 -133.066616 -23.104139 19.695494

27001647471.006645 -27.253283 112.297230 -0.461232 106.068363 -0.457380 106.198584 -26.510214 -77.900230

27631160676.593178 -30.361881 -168.178401 -0.455009 -17.907822 -0.473248 -17.742401 -33.304329 -45.653780

28275350278.367512 -17.914343 -10.269666 -0.535415 -144.847239 -0.495666 -144.767531 -18.500405 -94.926037

28934558440.089119 -25.403265 -145.855952 -0.458652 85.819950 -0.471521 86.027882 -25.033409 132.887622

29609135302.682766 -21.411602 -123.245956 -0.500273 -47.265432 -0.509761 -47.235075 -21.254847 -153.392821

30299439170.217197 -27.014691 72.673095 -0.489298 176.678655 -0.474972 177.031191 -25.338474 101.072054

31005836700.219704 -26.316760 -92.472631 -0.452905 37.601195 -0.500821 37.724078 -24.884493 -3.740226

31728703098.427670 -24.576379 -122.274522 -0.482050 -105.277061 -0.496607 -105.184253 -22.985629 83.341478

32468422318.080524 -18.473439 97.257414 -0.522336 109.131590 -0.552294 109.178004 -17.832689 -62.528240

33225387263.857967 -35.956091 36.668777 -0.453368 -40.549604 -0.433040 -40.351388 -38.607656 -59.673550

34000000000.000000 -18.584633 -83.525655 -0.518071 166.056015 -0.538472 166.289380 -18.908405 -121.618048

InfiniiMax III Series Probes User’s Guide 95

Page 96

6 Performance Verification

DC Input Resistance Performance Verification

Keysight recommends a test interval of one year or 2000 hours of operation.

Table 12 Required Equipment

Typ e Requirement

Performance Verification Fixture Keysight N5443A (no substitute)

BNC(m) to SMA(m) Adapter Pomona 4288 or equivalent

Banana Plug to BNC(f) Pomona 1269 or equivalent

Digital Multimeter Keysight 33401A or equivalent

Critical specification: 2 wire resistance accuracy

Power Supply for Probe DSO/DSA 90000 X-series oscilloscope or 1134A power supply with N5477A

Autoprobe adapter (see the procedure “Bandwidth Performance

Verification" on page 78.)

No substitute

Probe Positioner Keysight N2787A 3D Probe Positioner

Critical specification: stable/accurate positioning

Small Bench Vise —

InfiniiMax III Probe Head Either the N5439A ZIF probe head with the N5440A ceramic ZIF tip, the N5441A

solder-in probe head, or the N5445A browser probe head. (You only need to perform the Performance Verification test on one of these probe heads, not all of them. If it passes for one of them, then it will pass for all of them.)

96 InfiniiMax III Series Probes User’s Guide

Page 97

Performance Verification 6

Measuring Input Resistance for ZIF Probe Heads or Solder-in Probe Heads

1 Connect the BNC to SMA adapter and BNC to Banana Plug adapters as shown in

Figure 70.

2 Position the PV fixture on a table top and clamp it with a small bench vise to steady it.

Ensure that the PV fixture is flush with the table top so that when the banana plugs are probed, it does not rock the PV fixture.

Figure 70 Measuring the differential input resistance of a ZIF or solder-in probe head

3 Connect the probe amplifier to the oscilloscope or power supply so it is powered.

4 Connect the ZIF or solder-in probe head to the probe amp and insert it into the PV fixture

as shown Figure 70.

5 Depress the pincher fingers on the PV fixture so they open and carefully insert the tip wires

under the pinchers. Release the pichers once the tips are inserted.

6 As shown in Figure 70, measure the DC input resistance between the banana plugs. Since

one tip wire is connected to the signal line and the other tip is connected to the PV fixture ground, this is a measurement of the differential input resistance. It should be 100 kOhms +/- 2% (98 to 102 kOhms).

7 To measure the single-ended input resistance, measure the resistance between the signal

plug of the banana adapter and the probe amplifier ground, which can be accessed as shown in Figure 71 (through the vent window of the probe amplifier).

Figure 71 Measuring the single-ended input resistance of a ZIF or solder-in probe head

InfiniiMax III Series Probes User’s Guide 97

Page 98

6 Performance Verification

Measuring Input Resistance for the Browser Probe Head

The following image shows the correct setup for measuring the differential input resistance of the N5445A Browser probe head (Figure 72).

Figure 72 Setup for Measuring Input Resistance for Browser Probe Head

1 Set the browser for a fairly wide span (span does not impact this DC measurement).

2 Plug the probe amplifier into the browser.

3 Clamp the browser with the N2787A probe positioner.

4 Hold the browser with one hand and loosen the arm locking knob on the probe positioner

with the other hand.

5 Carefully position one tip over the signal trace on the PV fixture and the other over the

ground plane. Then let the weight of the browser slightly compress the tips so good contact is made.

6 Now the differential and single-ended input resistance can be measured in the same

manner as for the ZIF and solder-in probe head procedure above.

98 InfiniiMax III Series Probes User’s Guide

Page 99

Performance Test Record

NOTE

The recommended test interval is 1 Year/2000 hours.

Keysight Technologies Keysight InfiniiMax III Series Probe

Model Number: Tested by:

Serial Number: Work Order Number:

Recommended next test date: Date:

Performance Verification 6

Probe Head (only required to test one)

Bandwidth Performance Test

N5439A with N5440A ≥ 26 GHz

N5445A ≥ 28 GHz

DC Input Resistance Performance Test

N5439A with N5440A 98 to 102 kΩ (differential mode)

N5445A 98 to 102 kΩ (differential mode)

N5441A 98 to 102 kΩ (differential mode)

Test Limits Result Pass/Fail

49 to 51 kΩ (single-ended mode)

InfiniiMax III Series Probes User’s Guide 99

Page 100

6 Performance Verification

100 InfiniiMax III Series Probes User’s Guide

Keysight N5445A InfiniiMax III, N2848A InfiniiMax III+, N5439A InfiniiMax III, N2836A InfiniiMax III, N5441A InfiniiMax III User Manual

Contents

InfiniiMax III Probe Amplifiers

Figure 1 InfiniiMax III Probe Amplifier

Menu Button

Light Button

Sensitivity Indicator

DC Calibration Indicator

Channel Identification Rings

Channel Connection

Figure 2 Clutches on an Infiniium 90000 X-series oscilloscope

Probe Amplifier Bandwidth Upgrades

InfiniiMax III and III+ Probing System Family Diagram

Figure 3 InfiniiMax III / III+ Probing System

Proper Handling Techniques

Before Connecting a Probe

Figure 4 Static-Safe Work Station

Figure 5 Wrist Strap Connected to Oscilloscope Ground Socket

Connecting a Probe to an Oscilloscope Channel

Figure 6 Probe Head Attached to DUT

Figure 7 Probe Amplifier Connected to Oscilloscope

Figure 8 Probe Head Connected to Probe Amplifier

Disconnecting a Probe from an Oscilloscope Channel

Probing the DUT

N5477A Sampling Scope Adapter

Figure 10 N5477A InfiniiMax III Sampling Scope Adapter

Cautions

2 InfiniiMax III Probe Heads

N5445A InfiniiMax III Differential Browser Probe Head

Figure 11 N5445A InfiniiMax III Differential Browser Head

Using the LED Headlights

Adjusting the Tip Span

Figure 12 Adjusting the Tip Span

Tip-Span Entry for Probe Calibration

Figure 13 Tip Span Gauge on Browser Protective Cap

Mounting the Browser

Figure 14 Dimensions of Mounting Holes

Probe Along the Browser’s Axis

Figure 15 Proper Probe Handling

Figure 16 Improper Probe Handling

Replaceable Parts

Figure 17 Browser Tips and Ground Blade

N2787A 3D Probe Positioner

Figure 18 Using the Browser with the N2787A 3D Probe Positioner

N2848A InfiniiMax III+ QuickTip InfiniiMode Probe Head

Figure 19 Magnet Connections in Probe Head

Figure 20 Probing with the N2848A Probe Head and N2849A QuickTip

Connecting a QuickTip to the DUT

Cleaning the Magnetic Connections

Figure 21 N2848A Head Before and After Cleaning

N5439A InfiniiMax III ZIF Probe Head

Ensuring Maximum N2838A Tip Performance

Figure 22 Proper Position of Resistors

Soldering a ZIF Tip to the DUT

Figure 23 Five ZIF Tips on Packaging

Figure 24 Preparing the DUT Leads

Figure 25 Soldering the ZIF Tip

Figure 26 Removing the Handle from the ZIF Tip

Connecting the Probe Head to the ZIF Tip

Figure 27 Probe Head with Location of the Lever

Figure 28 Probe Head Connected to a Soldered ZIF Tip

Figure 29 Probe Oriented Perpendicular to Device

N2836A InfiniiMax III Solder-in Probe Head

Figure 30 N2836A InfiniiMax III solder-in probe head

Figure 31 Probe Head Connection to DUT

Ensuring Maximum Performance

Figure 32 N2836A With 1 mm Tip Spacing

Soldering the Probe Head to the DUT

Figure 33 Applying Flux

Figure 34 Tin the Leads

Figure 35 Applying Flux to Leads and Wires

Figure 36 Positioning Wires

N5441A InfiniiMax III Solder-in Probe Head

Figure 37 N5441A InfiniiMax III solder-in probe head

Soldering the Probe Head to the DUT

Figure 38 Applying Flux

Figure 39 Tin the Leads

Figure 40 Applying Flux to Leads and Wires

Figure 41 Positioning Wires

N5444A InfiniiMax III 2.92 mm / 3.5 mm / SMA Probe Head