Keysight E2655C User Guide

Keysight E2655C Probe
Deskew and Performance
Verification Kit

User Guide

Notices

CAUTION

WARNING

© Keysight Technologies 2003, 2004, 2013,
2016

No part of this manual may be reproduced in
any form or by any means (includ ing elec­tronic storage and retrieval or translation
into a foreign language) without prior agree­ment and written consent from Keysight
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and international copyright laws.

Manual Part Number

E2655-92004

Edition

Fifth Edition, August 2016

Available in electronic format only

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

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THE MATERIAL CONTAINED IN THIS DOCU­MENT IS PROVIDED "AS IS," AND IS SUB­JECT TO BEING CHANGED, WITHOUT
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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 d amage to the prod uct
or loss of important data. Do not pro­ceed beyond a CAUTION 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.

2 E2655C Probe Deskew and Performance Verification Kit User’s Guide

E2655C Probe Deskew and Performance Verification Kit User’s Guide 3

4 E2655C Probe Deskew and Performance Verification Kit User’s Guide

Introduction

Calibration for the Solder-in and Socketed Probe Heads 7
Calibration for Hand-held Browser Probe Heads 14

Calibrating the InfiniiMax probes (1168B, 1169B, 1130B, 1131B, 1132B, 1134B)
and the InfiniiMode differential probes (N2750A, N2751A, N2752A) is done using
the E2655C Probe Deskew and Performance Verification Kit. The kit contains the
following parts:

• SMA (male) to SMA (male) adapter

• SMA (male) to BNC (female) adapter

• BNC (male) to SMA (male) adapter

• 50 Ω SMA Terminator

• De-skew Fixture

Figure 1 E2655C Probe Deskew and Performance Verification Kit

This document contains procedures showing vertical and skew calibration for the
InfiniiMax (1160B series and 1130B series probes) solder-in differential probe head
and the differential browser probe head. However, the procedures also apply to all
of the different InfiniiMax probe configurations.

For use with the probe calibration and verifications, we highly recommend using
the N2787A 3D probe positioner.

6 E2655C Probe Deskew and Performance Verification Kit User’s Guide

Calibration for the Solder-in and Socketed Probe Heads

NOTE

NOTE

Calibration of the solder-in and socketed probe heads consists of a vertical
calibration and a skew calibration. The vertical calibration should be performed
before the skew calibration. Both calibrations should be performed for best probe
measurement performance.

Before calibrating the probe, verify that the Infiniium oscilloscope has been calibrated recently
and that the calibration
oscilloscope before calibrating the probe. This information is found in the Infiniium Calibration
dialog box.

Connecting the Probe for Calibration

The calibration procedure requires the following parts.

• BNC (male) to SMA (male) adapter

•Deskew fixture

• 50 Ω SMA terminator

For the following procedure, refer to Figure 2.

1 Connect BNC (male) to SMA (male) adapter to the deskew fixture on the

connector closest to the pincher.

2 Connect the 50 Ω SMA terminator to the connector farthest from the pincher.
3 Connect the BNC side of the deskew fixture to the Aux Out BNC of the Infiniium

oscilloscope.

4 Connect the probe to an oscilloscope channel.

Δ temperature is within ±5 °C. If this is not the case, calibrate the

5 To minimize the wear and tear on the probe head, the probe head should be

placed on a support to relieve the strain on the probe head cables.

6 Push down on the back side of the pincher. Insert the probe head resistor lead

underneath the center of the pincher and over the center conductor of the
deskew fixture. The negative probe head resistor lead or ground lead must be
underneath the pincher and over one of the outside copper conductors
(ground) of the deskew fixture. Make sure that the probe head is approximately
perpendicular to the deskew fixture.

For the socketed probe head, insert two properly trimmed 82 Ω resistors into the sockets.

7 Release the pincher.

E2655C Probe Deskew and Performance Verification Kit User’s Guide 7

NOTE

nfiniiMax Probe

To ensure contact, pull up on the back side of the pincher to ensure good contact between
resistor leads and the deskew fixture.

Figure 2 Connecting the Probe for Calibration

8 E2655C Probe Deskew and Performance Verification Kit User’s Guide

Verifying the Connection

1 On the Infiniium oscilloscope, press the [Auto Scale] key on the front panel.
2 Set the volts per division to 100 mV/div.
3 Set the horizontal scale to 1.00 ns/div.
4 Set the horizontal position to approximately 3ns. You should see a waveform

similar to that in Figure 3.

Figure 3 Good Connection

If you see a waveform similar to that of Figure 4 then you have a bad connection
and should check all of your probe connections.

E2655C Probe Deskew and Performance Verification Kit User’s Guide 9

Figure 4 Bad Connection

Running the Probe Calibration and Deskew

1 On the Infiniium oscilloscope in the Setup menu, select the channel connected

to the probe.

2 In the Channel Setup dialog box, select the Probe Config... button.
3 Select the Probe head model from the drop-down menu.
4 In the Probe Configuration dialog box, select the Calibrate Probe... button.
5 In the Probe Calibration dialog box, select the Start Atten/Offset Calibration...

button and follow the on-screen instructions for the vertical calibration
procedure.

6 Once the vertical calibration has successfully completed, select the Start Skew

Calibration... button and follow the on-screen instructions for the skew

calibration.

At the end of each calibration the oscilloscope will inform you if the calibration
was or was not successful.

10 E2655C Probe Deskew and Performance Verification Kit User’s Guide

Verifying the Probe Calibration

NOTE

If you have just successfully calibrated the probe, it is not necessary to perform
this verification. However, if want to verify the probe was properly calibrated, the
following procedure will help you verify the calibration.

The calibration procedure requires the following parts.

• BNC (male) to SMA (male) adapter

• SMA (male) to BNC (female) adapter

• BNC (male) to BNC (male) 12 inch cable such as the Keysight 8120-1838 (not
included in this kit)

• Keysight 54855-61620 calibration cable (Infiniium oscilloscopes with
bandwidths of 6 GHz and greater only)

• Keysight 54855-67604 precision 3.5 mm adapters (Infiniium oscilloscopes with
bandwidths of 6 GHz and greater only)

•Deskew fixture

For the following procedure, refer to Figure 5.

1 Connect BNC (male) to SMA (male) adapter to the deskew fixture on the

connector closest to the pincher.

2 Connect the SMA (male) to BNC (female) to the connector farthest from the

pincher.

3 Connect the BNC (male) to BNC (male) cable to the BNC connector on the

deskew fixture to one of the unused oscilloscope channels. For Infiniium
oscilloscopes with bandwidths of 6 GHz and greater, use the 54855-61620
calibration cable and the two 54855-67604 precision 3.5 mm adapters.

4 Connect the BNC side of the deskew fixture to the Aux Out BNC of the Infiniium

oscilloscope.

5 Connect the probe to an oscilloscope channel.
6 To minimize the wear and tear on the probe head, the probe head should be

placed on a support to relieve the strain on the probe head cables.

We recommend the Keysight N2787A 3D probe positioner for this.

7 Push down on the back side of the pincher. Insert the probe head resistor lead

underneath the center of the pincher and over the center conductor of the
deskew fixture. The negative probe head resistor lead or ground lead must be
underneath the pincher and over one of the outside copper conductors
(ground) of the deskew fixture. Make sure that the probe head is approximately
perpendicular to the deskew fixture.

For the socketed probe head, insert two properly trimmed 82 Ω resistors into the sockets.

E2655C Probe Deskew and Performance Verification Kit User’s Guide 11

NOTE

BNC to SMA Connector

BNC Cable

Pincher

Deskew Fixture

SMA to BNC Connector

InfiniiMax Probe

8 Release the pincher.

To ensure contact, pull up on the back side of the pincher to ensure good contact between
resistor leads and the deskew fixture.

Figure 5 Connection setup for verifying the probe calibration

12 E2655C Probe Deskew and Performance Verification Kit User’s Guide

9 On the oscilloscope, press the [Auto Scale] key on the front panel.

10 Select Setup menu and choose the channel connected to the BNC cable from

the pull-down menu.

11 Select the Probes... button.
12 Select the Configure Probe System button.
13 Select User Defined Probe from the pull-down menu.
14 Select the Calibrate Probe... button.
15 Once the skew calibration is completed, close all dialog boxes.
16 Select the Start Skew Calibration... button and follow the on-screen

instructions.

17 Set the vertical scale for the displayed channels to 100 mV/div.
18 Set the horizontal range to 1.00 ns/div.
19 Set the horizontal position to approximately 3ns.
20 Change the vertical position knobs of both channels until the waveforms

overlap each other.

21 Select the Setup menu choose Acquisition... from the pull-down menu.
22 In the Acquisition Setup dialog box enable averaging. When you close the

dialog box, you should see waveforms similar to that in Figure 6.

Figure 6 Overlapping Waveforms

E2655C Probe Deskew and Performance Verification Kit User’s Guide 13

Calibration for Hand-held Browser Probe Heads

NOTE

Calibration of the hand-held browser probe heads consists of a vertical calibration
and a skew calibration. The vertical calibration should be performed before the
skew calibration. Both calibrations should be performed for best probe
measurement performance.

Before calibrating the probe, verify that the Infiniium oscilloscope has been calibrated recently
and that the calibration
oscilloscope before calibrating the probe. This information is found in the Infiniium Calibration
dialog box.

Calibration Setup

The calibration procedure requires the following parts.

• BNC (male) to SMA (male) adapter

•Deskew fixture

• 50 Ω SMA terminator

For the following procedure, refer to Figure 7.

1 Connect BNC (male) to SMA (male) adapter to the deskew fixture on the

connector closest to the pincher.

2 Connect the 50 Ω SMA terminator to the connector farthest from the pincher.
3 Connect the BNC side of the deskew fixture to the Aux Out of the Infiniium

oscilloscope.

4 Connect the probe to an oscilloscope channel.

Δ temperature is within ±5 °C. If this is not the case, calibrate the

5 Place the positive resistor tip of the browser on the center conductor of the

deskew fixture between the green line and front end of the pincher. The
negative resistor tip or ground pin of the browser must be on either of the two
outside conductors (ground) of the deskew fixture.

6 On the Infiniium oscilloscope in the Setup menu, select the channel connected

to the probe.

7 In the Channel Setup dialog box select the Probe Config... button.
8 In the Probe Configuration dialog box select the Calibrate Probe... button.
9 Select the Start Atten/Offset Calibration... button and follow the on-screen

instructions for the vertical calibration procedure.

10 Once the vertical calibration has successfully completed, select the Calibrated

Skew... button.

11 Select the Start Skew Calibration... button and follow the on-screen

instructions for the skew calibration.

14 E2655C Probe Deskew and Performance Verification Kit User’s Guide

BNC to SMA Connector
(not visible)

InfiniiMax Probe

Pincher

Deskew Fixture

50 W SMA Terminator

Figure 7 Calibration setup

E2655C Probe Deskew and Performance Verification Kit User’s Guide 15

16 E2655C Probe Deskew and Performance Verification Kit User’s Guide

E2655C Probe Deskew and Performance Verification Kit User’s Guide 17

This information is subject to
change without notice.
© Keysight Technologies 2003-2004, 2013, 2016
Edition 5 August 2016

*E2655-92004*

www.keysight.com