Tektronix P7708, P7716, P7720, P7713 User Manual

x

P7700 Series
TriMode™ Probes

ZZZ

User Manual

*P071342102*

071-3421-02

xx

P7700 Series
TriMode™ Probes

ZZZ

User Manual

www.tek.com

071-3421-02

Copyright © Tektronix. All rights reserved. Licens ed software products are owned by Tektronix or its subsidiaries or suppliers, and are protected by
national copyright laws and international treaty provisions.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all previously
published material. Specifications and price ch ange privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

TriMode and TekFlex are both trademarks of Tektronix, Inc.

Contacting Tektronix

Tektronix, Inc.
14150 SW Karl Braun Drive
P.O . B ox 5 0 0
Beaverton, OR 97077
USA

For product information, sales, service, and technical support:

In North America, call 1-800-833-9200.
Worldwide, visit www.tek.com to find contacts in your area.

Warranty

Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If
any such product proves d efective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts
and labor, or will provide a replacement in exchange for the defective product. Parts, modules and replacement products used by Tektronix for
warranty work may be new or reconditioned to like new performance. All replaced parts, modules and products become the property of Tektronix.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period and make
suitable arrangements for the performance of service. Customer shall be responsible for packag ing and shipping the defective product to the service
center designated by Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a
location within the country in which the Tektronix service center is l o cated. Customer shall be responsible for paying all shipping charges, duties,
taxes, and any other charges for products returned t o any other locations.

This warranty shall not apply to any defect, failure or da m age caused b y improper use or improper or inadequate maintenance and care. Tektronix
shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by personnel other than Tektronix
representatives to install, repair or service the product; b) to repair damage resulting from improper use or connection to incompatible equipment; c) to
repair any damage or malfunction caused by the use of non-Tektronix supplies; or d) to s ervice a product that has been modified or integrated with
other products when the effect of such modification or integration increases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR
IMPLIED. TEK TRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. TEKTRONIX' RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY
PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
[W2 – 15AUG04]

Table of Contents

Importantsafety information................................................................................................................ iii

General safety summary. . ............................................................................................................ iii

Terms in this manual .. . ............................................................................................................... iv

Symbols and terms on the product.................................................................................................... v

Compliance information .................................................................................................................... vi

Environmental considerations ........................................................................................................ vi

Preface..................................................................................................................................... vii

Probe models ........................................................................................................................ vii

Documentation....................................................................................................................... vii

Key features ................................................................................................................................ 1

Operating considerations................................................................................................................... 2

Installation .................................................................................................................................. 4

Overview .............................................................................................................................. 4

Connect to the host instrument ....................................................................................................... 5

Connect P7700 accessories to the TekFlex connector . ............................................................................. 7

Probe comp box controls and indicators ............................................................................................. 8

Table of Contents

Functional check andcalibration.......................................................................................................... 11

Functional check..................................................................................................................... 11

TriMode probe DC calibration .......................................................................................................18

P7700 Series TriMode Probes User Manual i

Table of Contents

Basic operation ............................................................................................................................ 24

Probe handling best practices............................................................................................................. 64

S-parameter information................................................................................................................... 66

Accessories and options .................................................................................................................. 67

Maintenance ............................................................................................................................... 74

Index

Probe setup screen .................................................................................................................. 28

Improving measurement accuracy .................................................................................................. 36

Connecting to a circuit board . . . ..................................................................................................... 45

Standard accessories. . .............................................................................................................. 67

Optional accessories................................................................................................................. 70

Host instrument firmware............................................................................................................ 74

Browser tip replacement............................................................................................................. 75

Error conditions ...................................................................................................................... 76

Handling the probe................................................................................................................... 79

Cleaning the probe................................................................................................................... 80

Returning theprobe for servicing.................................................................................................... 81

ii P7700 Series TriMode Probes User Manual

Important safety information

This manual contains information and warnings that must be followed by the user for safe operation and to keep the product
in a safe condition.

General safety summary

Use the product only a s specified . Review the following safety precautions to avoid injury and prevent damage to this product or
any products connected to it. Carefully read all instructions. Retain these instructions for future reference.

This product is not intended for detection of hazardous voltages.

Observe all terminal ratings. To avoid fire or shock hazard, observe all ratings and markings on the product. Consult the

product manual for further ratings information before making connections to the product.

Do not ap ply a potential to any terminal, including the c ommon terminal, that exceeds the maximum rating of that terminal.

Do not operate without covers. Do not operate this product with covers or panels removed, or with the case open. Hazardous

voltage exposure is possible.

Avoid exposed circuitry. Do not touch exposed connections and components when power is present.

Do not operate in wet/damp conditions. Be a wa re that condensation may occur if a unit is moved from a cold to a warm

environment.

Important safety information

Do not operate in an explosive atmosphere.

Keep product surfaces clean and dry.

P7700 Series TriMode Probes User Manual iii

Remove the input signals before you clean the product.

Important safety information

Probes and test leads

Remove all probes, test leads and accessories that are not in use.

Inspect the probe and accessories. Before each use, inspect probe and accessories for damage (cuts, tears, or defects in the

probe body, accessories, or cable jacket). Do not use if damaged.

Useonspecified replacement parts.

Termsinthismanual

These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in damage to t his product or other property.

iv P7700 Series TriMode Pro bes User Manual

Symbols and terms on the product

These terms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you read the marking.

WARNING indicates an injury hazard not immediately accessible as you read the marking.

CAUTION indicates a hazard to property including the product.

When this symbol is marked on the product, be sure to consult the manual to find out the nature of the potential
hazards and any actions which have to be taken to avoid them. (This sym bol may also be used to refer the
user to ratings in the manual.)

The following symbol(s) may appear on the product:

Important safety information

P7700 Series TriMode Probes User Manual v

Compliance information

Compliance information

This section lists the environmental standards with which the instrument complies.

Environmental considerations

This section provides information about the environmental impact of the prod uct.

Product end-of-life handling

Observe the following guidelines when recycling an instrument or compo nent:

Equipment recycling. Production of this equipment required the extraction and use of natural resources. The equ ipment may

contain substances that cou ld be harmful to the environment or human health if improperly handled at the pro duct’s end of life. To
avoid release of such substances into the environment and to reduce the use of natural resources, we en courage you to recycle this
product in an appropriate system that will ensure that most of the materials are reused or re cycled appropriately.

This symbol indicates that this product complies with the applicable European Union requirements according to
Directives 2012/19/EU and 2006/66/EC on waste electrical and electronic equipment (WEEE) and batteries. For
information about recycling op tions, check the Tektronix Web site (www.tek.com/productrecycling).

vi P7700 Series TriMode Probes User Manual

Preface

This manual describes the installation and operation of the P7700 Se ries TriMode Probes. Basic probe operations and concepts
are presented in this manual. All documents listed below are accessible from the Tektronix Web site (www.tek.com/manuals).

Probe models

These P7700 Series TriMode Probe family includes these models:

P7708 8 GHz

P7713 13 GHz

P7716 16 GHz

P7720 20 GHz

Documentation

To read about Use these documents

Installation and Operation (overviews) Read this manual for information about how to set up and use your probe.

In-Depth Operation Use the technical reference manual and this manual.

Specifications Use the technical reference manual.

Reordering accessories

Preface

Use the Accessories and Options section or refer to the insert in your
accessory kit when reordering accessories.

P7700 Series TriMode Probes User Manual vii

Preface

viii P7700 Series TriMode Probes User Manual

Key features

The P7700 Series TriMode Probes allow you to take differential, single-ended, and common mode measurements with one probe
connection. Key features includ e:

Low loading for low power circuits

Thin solder-in tips that can fitintotight

spaces on a device under test

Flexible solder-in tips and main probe cable

Lightweight probe cable and head

TekFlex™ connector technology that
makes the probe easy to connect to
accessories

Optional 2.92 mm adapter for connecting
to 50 Ω RF test points

Browser accessory with adjustable tips and
headlight

Full AC calibration of the probe and
accessory tips with unique S-parameters

Key features

Solder-in tips operate at extended
temperature range

P7700 Series TriMode Probes User Manual 1

Operating considerations

Operating considerations

Table 1: P7700 Series TriMode probes

Characteristic Description Specification

Input Voltage Dynamic range

Operating voltage
window

Offset voltage range

Maximum non­destructive input
voltage

Temperature

Non-operating

TekFlex solder-in
tips

2.5 Vpp (single­ended)

5.0 Vpp (differential
input)

±5.25 V ±10.0 V ±4.0 V

-4 V to +4 V -10 V to +10 V -4 V to +4 V

-15 V to +15 V (tip attached or detached)

Probe compensation box: 0 °C to 45 °C (32 °F to 113 °F)Operating

Probe cable, solder tips, and P77292MM adapter: -35 °C to 85 °C (-31 °F to
185 °F); Minimum Airflow required 46°C to 85°C (114.8 °F to 185 °F)

Probe compensation box: -20 °C to 60 °Cg (-4 °F to 140 °F)

Probe cable, solder tips, and P77292MM adapter: -35 °C to 85 °C (-31 °F to
185 °F)

P77BRWSR P77C292MM adapter

6.0 Vpp (single­ended)

12.0 Vpp (differential
input)

1.2 Vpp (single­ended)

2.0 Vpp (differential
input)

-5Vto+5V

2 P7700 Series TriMode Probes User Manual

Operating considerations

Characteristic Description Specification

TekFlex solder-in

P77BRWSR P77C292MM adapter

tips

Humidity

Operating Probe Compensation Box, C able, Tips, and SMA adapter: 20% to 80%

Relative Humidity (%RH) at up to 45°C non-condensing

Non-operating

Probe Compensation Box, Cable, Tips, and P772 92MM adapter: 10% to 90%
(Relative Humidity), non-condensing

Altitude Non-operating

Probe Compensation Box, Cable, Tips, and SMA adapter: 12,000 meters
(39,370 feet)

Pollution Degree 2, Indoor use only

CAUTION. To avoid ESD damage to the probe, always use an antistatic wrist strap (provided with your probe), and work at

a static-approved workstation when you handle the probe.

P7700 Series TriMode Probes User Manual 3

Installation

Installation

Before you connect the probe to your instrument, read the Overview below to understand the sequence of events necessary to
properly install the probe and adapters.

CAUTION. To avoid ESD damage to the probe, always use an antistatic wrist strap (provided with your probe), and work at

a static-approved workstation when you handle the probe.

Overview

1. Connect the probe to the host instrument.

If it is the first time the probe has been connected to the oscilloscope, the oscilloscope will download the S-parameters stored in
the probe. Once the oscilloscope has stored the S-paramete rs for the probe, it doesn’t matter which channel the probe is
plugged into. The stored S-parameters will be available for any channel the probe is moved to.

2. Connect the probe t ip to the TekFlex connector on the probe.

When a tip is inserted into the probe for the first time, the oscilloscope will download the S-parameter data stored in the tip.

3. The p

4. Open the Calibration menu (found in the Vertical menu).

5. Perform the DC probe calibration procedure using the DC probe cal fixture that ships standard with each probe. (See page 18,

6. Use the Probe Setup screen to set the probe parameters as described in the Basic Operation section.

4 P7700 Series TriMode Probes User Manual

robe performs a self test, and then one Input Mode LED remains on.

TriMode probe DC calibration.)

Connect to the host instrument

NOTE. Your TekConnect instrument may

require a firmware upgrade to support full
functionality of the P7700 Series probes.
Before you connect the probe, check the
version requirements. (See page 74, Host
instrument firmware.)

1. Slide the probe into the TekConnect
receptacle. The probe clicks into place
when fully engaged.

2. Optional. Turn the thumbscrew clockwise
(finger-tight only) to secure the probe to
the instrument.

Disconnect

3. To disconnect, turn the thumbscrew

counter-clockwise.

4. Press the latch release button and pu ll the
probe away from the instrument.

Installation

P7700 Series TriMode Probes User Manual 5

Installation

Probe and probe tip power-on

After the con nection to the oscilloscope is
made:

1. The probe briefly turns on all LEDs during
a self-test, and then the A – B Input Mode
LED remains on. If a probe tip is attached,
an LED on the tip also turns on when
properly attached to the probe.

2. The probe transfe rs data from the probe
and tip to the host instrument, and a
message displays on the instrument as the
transfer occurs.

The data transfer takes a few minutes,
and is only don e when the host instrument
discovers a new probe or new probe
tip. The data transfer only occurs on
instruments that are fully compatible with
the probe.

3. After the data transfer is done, the probe is ready for a fun c tional check and calibration. (See page 11, Functional check.)

NOTE. If the probe’s warning light remains on, the power-on self-test likely failed.

(See page 76, Error conditions.)

6 P7700 Series TriMode Probes User Manual

Connect P7700 accessories to the TekFlex connector

All of the P7700 accessories mate with the new TekFlex (zero insertion force) connector. This connector provides an easy
connection with one handed operation for attaching to the P7700 series accessories. T he following procedures show the steps for
connecting probe tips to the TekFlex conne ctor; the procedures for connecting to other accessories are similar.

Connect the tip to the probe TekFlex connector as follows:

1. Pinch the TekFlex connector to open the

jaws.

2. Orient the tip with the probe head (notch to

the left) and slide the tip connector into the
TekFlex connector.

A green LED will light up when the tip is
inserted. The LED is the first indication that
the tip is powered and is inserted. You also
need to confirm that the connector p in s
on the TekFlex connector fit through the
alignment holes on the tip.

3. Once the tip is fully inserted, release the

pinch and the TekFlex connector closes.
When closed and properly seated, the top
of connector will be flush with the probe tip
housing.

Installation

P7700 Series TriMode Probes User Manual 7

Installation

Probe comp box controls and indicators

Input mode buttons and LEDs

The P7700 Series solder-in tips support TriMode operation. TriMode enables you to switch the probe between four different
measurement types without changing the probe’s connection:

NOTE. You can also change the Input Mode in the oscillosco pe Probe Setup screen.

Press the Input Mode button to select one of
the four TriMode measurements. The modes
cycle in the following sequence:

A – B (for differential signal measurement)

A – GND (for A inp ut single-ended
measurement)

B – GND (for B inp ut single-ended
measurement)

(A+B)/2–GND(forcommonmode
measurement)

8 P7700 Series TriMode Probes User Manual

Installation

Warning LED

The Warning LED glows amber under the
following conditions:

Probe power-on self test failure

Probe tip over-temperature detected

The input voltage on either the A or B input
exceeds the allowable limit

The Warning LED clears when the condition
causing the warning is removed. A notifier
message of a probe warning condition can also
be seen on the oscilloscope.

CAUTION. Do not exceed the input voltage limits of the probe and probe tips. The probe or oscilloscope circuits may be damaged

if the limits are exceeded. Make sure that you understand and work within the limits of the pro be and probe tips.

P7700 Series TriMode Probes User Manual 9

Installation

TriMode probing

TheTriModefeatureallowsyoutoview
two single-ended s ignals and the resultant
differential waveform and common-mode
voltage without moving the probe connection.
Press the Input Mode button to cycle through
the waveform views.

This example shows a typical signal on the
A and B inputs. The resultant differential
waveform and common-mode voltage are
shown.

10 P7700 Series TriMode Pro bes User Manual

Functional check and calibration

After you connect the probe to the oscilloscope, you can perform a functional check using either the optional deskew fixture
designed for the probe or the optional P77C292MM Adapter.

CAUTION. To avoid ESD damage to the probe, always use an antistatic wrist strap (provided with your probe), and work at

a static-approved workstation when you handle the probe.

Functional check

This procedure checks the four TriMode settings on the probe, using the FAST EDGE signal from the front panel of the oscilloscope.
It verifies the signal path o f both the probe A and B input signals and their combination in the four TriMode settings. The P7700
Series Probe deskew fixture is used to connect the FAST EDGE signal to the probe tip input. (See Table 2.) Alternately, the P7700
Series probe with the optional coaxial input adapter can connect directly to the FAST EDGE signal. (See Table 3 on page 12.)

Table 2: Required equ ipment, functional check with probe tip

Item Description Performance Requirement Recommended Example

Oscilloscope TekConnect Interface Tektronix MSO/DPO70000C/70000DX

Probe tip

Test board

Solder tip or Browser tip P77STFLXA

Probe deskew fixture P 77DESKEW

Functional check and calibration

1

2

P7700 Series TriMode Probes User Manual 11

Functional check and calibration

Table 2: Required equipment, functional check with probe tip (cont.)

Item Description Performance Requirement Recommended Example

USB cable assembly USB 2.0, A male to Micro B male, 1 m 174-6919-xx (included with

Coaxial cable SMA, 50Ω, male-to-male

1

Nine-digit part numbers (xxx-xxxx-xx) are Tektronix part numbers

2

Optional accessory

Table 3: Required equipment, functional check with SMA adapter

Item Description Performance Requirement Recommended Example

Oscilloscope TekConnect Interface Tektronix MSO/DPO70000C/70000DX

SMA adapter Coaxial input SMA adapter P77C292MM

1

Optional accessory

1

P77DESKEW)

174-1120-xx

1

12 P7700 Series TriMode Pro bes User Manual

Functional check and calibration

Test setup with the P77DESKEW
Fixture

1. Connect the probe to any channel (1-4)

of the oscilloscope (connection to CH4 is
shown). Set the oscilloscope to display the
connected channel.

2. Connect the USB cable assembly supplied

with the P77DESKEW fixture between the
USB connector on the fixture board and a
USB connector on the host oscilloscope.
Several white LEDs under the fixture Port1
and Port2 probe tip clamps will light up
when the fixtu re is attached to USB power.

3. Connect an SMA cable from the FAST

EDGE output connector on the oscilloscope
to the A input of the Probe Deskew Fixture.

4. Connect a P7700 Series probe tip to either the Port1 or Port2 on the P77DESKEW fixture. If a TekFlex solder-in tip is used

to make this connection, its tip input should be inserted into the plastic clamp of the deskew fixture port. This is done by
compressing the spring-loaded clamp, inserting the probe tip input into the clamp, and then releasing the clamp so that it
locks the connection.

P7700 Series TriMode Probes User Manual 13

Functional check and calibration

An additional set of green LEDs will light up under the probe tip clamp when the solder-down probe tip is properly inserted
into the clamp.

Finally, connect the TekFlex connector at the end of the probe main cable to the probe tip inserted into the deskew fixture port.
An LED on the probe tip will also light up when the tip is properly inserted into the TekFlex connector of the probe.

5. If a P77BRWSR tip is used instead of a solder-down tip to make connection to the Deskew Fixture, th e TekFlex connector of the
probe should first be connected to the P77BRWSR tip. The P77BRWSR tip inputs must t hen be pressed into place against the
A and B signal traces on the P77DESKEW fixture board edge, located between the Port1 and Port2 clamps. Either of the two
sets of A and B signal trace connection patterns located on the P77DESKEW fixture board edge may be used.

14 P7700 Series TriMode Pro bes User Manual

Functional check and calibration

Test setup with the P77C292MM
adapter

1. Connect the probe to any channel (1-4)

of the oscilloscope (connection to CH4 is
shown). Set the oscilloscope to display the
connected channel. Connect the probe to
the P77C292MM adapter.

2. Connect the A cable from the P77C292MM

adapter to the FAST E DGE output
connector on the oscilloscope. Leave the
B cable disconnected for now.

Test procedure

1. Set the prob e Input Mode to A-B.

2. Adjust the oscilloscope to display a stable waveform (or press the Autoset button). The FAST EDGE signal is a 1 KHz square

wave. The amplitude of the FAST EDGE signal is attenuated b y 2X, compared to a single path termination, due to the
power splitter built into the P77DESKEW fixture.

P7700 Series TriMode Probes User Manual 15

Functional check and calibration

3. When you see a stable square waveform, check the amplitude (use the horizontal cursors). The atten uated amplitude displayed
for a DPO70000 oscilloscope FAST EDGE signal routed throu gh the Deskew Fixture should be about 100 mVpp.

4. Cycle the Input Mode button through the
remaining selections and compare the
displayed waveforms to the waveform
measured in the setup steps.

A-B

A-GND (same amplitude and polarity as
preivously measured)

B-GND (the B input is grounded; no signal
is measured)

(A+B)/2- GND (half-amp litude, but the
same polarity as previously measured)

16 P7700 Series TriMode Pro bes User Manual

5. Change the FAST EDGE cable connection

from the Deskew Fixture A input to the B
input. If using the P77CSMAMM adapter,
disconnect the A SMA cable from the
FAST EDGE output and connect the SMA
B cable. Repeat the displayed waveform
checks. The measurements should be
different as follows:

A-B (the polarity of the signal will be
inverted due to the B signal inversion,
although the p-p amplitude should be the
same)

A-GND (the A input is grounded; no signal
is measured)

B-GND (same amplitude but non-inverted
polarity compared to the A-B mode)

(A+B)/2- GND (half-amp litude, but the
same polarity as measured in the B-GND
mode)

Functional check and calibration

P7700 Series TriMode Probes User Manual 17

Functional check and calibration

TriMode probe DC calibration

To maximize the amplitude accuracy of measurements made with a P7700 series probe, you should run a probe calibration routine
on each channel that you use. The probe calibration operation minimizes measurement errors by optimizing the DC gain and offset
of the probe. I ndividual calibration constants are stored for all TriMode settings, on each probe, on each channel.

CAUTION. To avoid ESD damage to the probe, always use an antistatic wrist strap (provided with your probe), and work at

a static-approved workstation when you handle the probe.

Table 4: Required equipment, DC calibration

Item Description Performance Requirement Recommended Example

Oscilloscope TekConnect Interface Tektronix MSO/DPO70000C/70000DX

Probe tip or

SMA adapter

Test fixture Probe DC calibration fixture

Coaxial cable BNC, 50Ω, male-to-male

1

Nine-digit part numbers (xxx-xxxx-xx) are Tektronix part numbers

2

P77STCABL, P77BRWSR, and P77C292MM are optional accessories

3

Standard accessory included with probe

Solder tip or Browser tip

Coaxial input SMA adapter

P77STFLXA

P77C292MM

067-4889-xx

012-0208-xx

1

2

2

3

3

18 P7700 Series TriMode Pro bes User Manual

Check the instrument c alibratio n
status

The Calibration Status of the instrument Signal
Path Compensation test must be Pass for the
probe calibration routine to run.

1. From the Utilities menu, select Instrument

Calibration.

2. In the Calibration box, check that the

Status field is Pass.

3. If the status is not pass, disconnect

all probes and signal sources from the
oscilloscope, and run the Signal Path
Compensation routine.

When the Signal Path compensation test status
is Pass, continue calibrating the probe. (See
page 20, Calibrate the probe.)

Functional check and calibration

P7700 Series TriMode Probes User Manual 19

Functional check and calibration

Calibrate the probe

1. Connect a BNC cable from the DC Probe Cal output connector on the oscilloscope to the BNC connector on the TriMode

DC Calibration board.

2. Connect the cable from the TekConnect adapter to the connector on the calibration board.

3. Connect the other end of the TekConnect adapter cable to the Aux In channel on the oscilloscope.

4. Connect the probe to any channel (1–4) of the oscilloscope. Allow the probe to warm up for 20 minutes.

5. Set the oscilloscope to display the channel.

6. Depending on your setups, do one of the following:

20 P7700 Series TriMode Pro bes User Manual

Attach a P7700 Series probe tip to the
TekFlex connector of the probe. For a
solder-in probe tip open the fixture’s tip
clamp, insert the input end of the tip, then
release the clamp. For a P77BRWSR
browser tip, the browser’s pins should
be pressed into the array of vias on the
calibration fixture.

NOTE. A set of green LEDs w ill light up under

the probe tip clamp when the solder-down
probe tip is properly inserted into the clamp.

Functional check and calibration

P7700 Series TriMode Probes User Manual 21

Functional check and calibration

Attach a P77C292MM Adapter to the
TekFlex connector of the probe. Connect
the A and B cables from the adapter to
the A and B connectors on the calibration
fixture.

22 P7700 Series TriMode Pro bes User Manual

Functional check and calibration

7. In the oscilloscope menu bar, select

Vertical and then select Probe Cal.

The Probe Setup dialog box appears.

The probe calibration routine runs, optimizing
the probe to the oscilloscope for both probe
attenuation settings.

8. Select the Compensate Probe button.

The probe calibration routine runs, optimizing
the probe to the oscilloscope for each input
mode setting.

NOTE. A switching relay on the fixture emits

a clicking sound when the calibration runs; this
is normal.

9. When the calibration routine completes, Compensated appears in the Probe Status bo x.

NOTE. If the Probe Cal routine fails, check the connection of the tip to the probe body and the tip to the calibration board.

P7700 Series TriMode Probes User Manual 23

Basic operation

Basic operation

This section includes information about t he probe input limits, using the probe controls, and procedures for connecting the probe
to your circuit.

Asimplified input model of the probe is shown below to illustrate the probe offset voltage controls. The probe has two symmetrical
signal inputs, the A input and the B input, which you can display independently or in combination by selecting the appropriate probe
input mode. The probe also has independent offset voltage cont rols for the probe A and B input signals.

Figure 1: Simplified probe inpu t model

24 P7700 Series TriMode Pro bes User Manual

Basic operation

Offset voltage. The offset voltage adjusts the probe input dynamic range within the larger probe input operating range, as shown

in the following figure. The probe input dynamic range is the region where an input signal is within the linear operating region of the
probe. The probe A and B offset voltages are set and stored as common settings for all fo ur input modes.

P7700 Series TriMode Probes User Manual 25

Basic operation

Figure 2: Input dynamic range for solder-in tips and browser

26 P7700 Series TriMode Pro bes User Manual

Basic operation

Using the offset voltages

The offset voltage nulls out the DC bias component of an input signal, allowing the (generally smaller) AC component of the signal
to be displayed. The size of the probe input dynamic range depends on the probe tip that you are using, as shown in the diagrams,
and can also depend on the input mode selected. The probe input dynamic range limits are shown on the oscilloscope display with
a momentary annunciating, arrow-tipped line, when the vertical scale setting is large enough.

To set the offset voltages on the probe, you can use the controls in the P robe Setup screen. (See page 28, Probe setup screen .)

To display the Probe Setup screen, select Probe Cal from the oscilloscope Vertical menu. You can also use the offset knobs on the
oscilloscope to set the offset volta ge of the probe.

P7700 Series TriMode Probes User Manual 27

Basic operation

Probe setup screen

Use the Probe Setup screen to adjust the probe input settings for the measurement you are taking. To display the Probe Setup
screen, select Probe Cal from the oscilloscope Vertical menu. The Probe Setup screen can be used to select the TriMode Input
Mode setting and is also used to adjust the offset voltage controls for the probe tip A and B inputs.

The following pages describe the controls and status fields in the Probe Setup screen.

Figure 3: Probe setup screen

28 P7700 Series TriMode Pro bes User Manual

Basic operation

Selecting the TriMode input mode

The Input Mode button on the probe toggles the internal pro be input selector switches among the four input mode selections.
The input mode can also be selected from the drop-down menu in the Probe Setup screen. This TriMode feature allows full
characterization of a differential signal from a single connection.

A-B mode. The A-B Mode is used for

making differential signal measurements and
represents the tra ditional differential probe
functionality. Since the A-B Mode measures the
difference between the A and B input signals,
it eliminates any common mode voltage, such
as a DC bias common to both inputs, within the
CMRR performance capability of the probe.

A-GND mode. The A-GND mode is used

for making single-ended measurements with
the probe A input. The probe ground input
connects the probe tip and main cable shield.
The A-GND Mode is designed for minimal
coupling from any signal present on the B input
within the A input isolation performance of the
probe.

P7700 Series TriMode Probes User Manual 29

Basic operation

B-GND mode. The B-GND mode is used for making single-ended measurements with the p robe B input. The probe ground input

connects the probe tip and main cable shield. The B-GND Mode is designed for minimal coupling from any s ignal present on the A
input within the B input isolation performance of the probe.

(A+B)/2 mode. The (A+B)/2 Mode is used for making common mode measurements on a differential signal and represents a

capability that previously co uld only be made using oscilloscope math on multiple channels. For a differential signal, the common
mode measurement indicates t he DC bias level and also shows the degree of asymmetry between the A an d B inputs. Since the
(A+B)/2 Mode measures the average between the A and B input signals, it eliminates any complementary differential signal voltage,
within the D MRR performance capability of the probe. This measurement also requires a ground connection to the probe.

30 P7700 Series TriMode Pro bes User Manual

Basic operation

Selecting the offset voltage

You can set both the A and B offset voltages to levels that are common for all input modes.

Offset voltages may be a utomatically gene rated by the probe and can be set automatically using the Auto Offset button and two
mode selection buttons in the Offset section of the Probe Setup screen. You can also enter s pecific offset values directly in the
Offset fields.

There are four manual offset voltage value entry fields which also display the current offset voltage settings. An offset voltage
entry field is activated for adjustment by clicking in the setting window. A single click activates both the setting window and the
general purpose knobs on the oscilloscope front panel. A second click in the setting window when activated also brings up a
keypad entry window. Although all four offset voltage value entry fields are active, only two of the control pairs are independent.
The manual controls interact with each other as follows:

Adjusting the A or B settings affects the Differential and Common settings

Differential = (A – B)

Common = (A + B)/2

Adjusting the Differential or Common settings affects the A and B settings

A = Common + (Differential/2)

B = Common – (Differential/2)

The oscilloscope vertical channel offset control also adjusts the selected Input mode offset voltage field.

P7700 Series TriMode Probes User Manual 31

Basic operation

Auto Offset voltage set buttons

The probe A and B signal inputs are sensed, monitored, and averaged by probe internal circuitry and the sensed values are used
by the automatic offset voltage control buttons.

Auto in Common. Click this selection to

select the common value Auto Offset mode.
When this mode is selected and the Auto Offset
button is pushed, the A and B offset fields are
both set to the mean value between the A and
B signal levels.

Auto Individually. Click this selection to

select the individual value Auto Offset mode.
When this mode is selected and the Auto Offset
button is pushed, Offset A offset is set to the
average value of the A signal and Offset Bis set
to the average value of the B signal.

Auto Offset. Push this button to initiate a m omentary Auto Offset cycle. The Offset A and Offset B values are automatically

set based on the selected Auto Offset mode and the A and B signal input voltages.

Tracking. When this box is selected, the probe continually measures the common mode voltage currently present on the inputs

of the probe. Using the measured common mode values the A, B, and CM offsets will be set automatically. When Tracking is
enabled, the A, B, and CM offsets cannot be changed manua lly.

32 P7700 Series TriMode Pro bes User Manual

Basic operation

The tracking function works best when measuring a differential sign al. When making single-ended measurements in Differential
Input mode with a browser tip, set the offset voltage control manually so that the tracking mode will be shut off. If single-ended
measurements are made with tracking mode active, the Offset A voltage will likely not be optimum and will be affected by the duty
cycle of the A input signal. The Offset A voltage should be set man ually to the center of the A signal voltage swing.

Termination voltage

For the P77C292MM adapter, the termination voltage adjusts the effective probe DC loading of th e 50 Ω input termination. Use the
termination voltage to minimize the DC loading of the probe input signals. By setting the termination voltage equal to the DC bias
voltage of the input signal, the probe DC loading is nulled out, as if a DC block was inserted. However, unlike a DC block, the
signal DC voltage is still present at the probe input and might require you to adjust the Offset voltage to move the signal into the
probe input dynamic range. There are some signal measurement applications that benefit from the availability of an adjustable
termination voltage and avoid the need for a pair of bias tees.

The probe A and B termination voltages are set
and stored independently for each of the four
input modes. When using the P77C292 MM
adapter, the termination voltage can be
adjusted over a limited operating range before
reaching an overload condition.

P7700 Series TriMode Probes User Manual 33

Basic operation

A graph of the operating limits of the termination
voltage with respect to the input voltage is
shown for the P77C292MM adapter. The hi and
lo lines represent the hysteresis sections and
the limits are the points where the Overload
light turns on.

34 P7700 Series TriMode Pro bes User Manual

Basic operation

Probe tip information

NOTE. Probe tip ID is fully automatic. Manual selection is not requ ired.

When the probe is first connected to the oscilloscope channel, the oscilloscope queries the probe for status information, including
the probe type, serial number, and the mo del number of the tip that is connected to the probe. The first time a probe o r probe tip is
connected to a host oscilloscope, the probe and probe tip serial numbers are logged and the s tored S-parameters are downloaded.
If the probe or probe tip are moved to another channel on the same oscilloscope, th e logged information is automatically processed
without repeating the download process.

The Probe Controls described below are accessed using the Probe Controls selection from the oscilloscope Vertical menu.

Controls. Click on the Control button to display the Probe Controls screen. This screen displays a subset of the selections that

are available in the Probe Setup screen. The resulting shorter display height allows more room for the waveform display area.

P7700 Series TriMode Probes User Manual 35

Basic operation

Improving measurement accuracy

This section c overs some of the features and characteristics of the probe that can affect the accura cy of your measurements, and
some steps that you can take to improve the performance of the probe.

P7700 Series probe architecture

The P7700 Series probe measurement setup, as shown in the simplified drawing below, requires a host TekConnect oscilloscope, a
P7700 Series probe, and a P7700 Series active probe tip. An active probe tip includes a dual input buffer capable of driving the 50
ohm signal path of the probe TekFlex connector and probe main cable. The dual input buffer is designed for good matching of the A
and B probe tip inputs to support differential measurements.

Figure 4: Simplified P7700 Series probe architecture diagram

36 P7700 Series TriMode Pro bes User Manual

Basic operation

The probe tip dual input buffer also provides high DC resistance input attenuators, which are carefully designed to minimize high
frequency loading on the input signals. The attenuation factor of the buffer input attenuators depends on the probe tip type. Using a
different attenuation factor allows you to trade-off dynamic range for noise performance.

The P7700 Series probe comp box contains the main probe amp lifier, as shown above. This main probe amplifier has a differential
input termination network that receives the buffered A and B input signals from the active probe tip. The main probe amplifier
in a P7700 Series probe has a TriMode input configuration for switching between differential, single-ended, and common-mode
measurements. The probe main amplifier has a wide gain range with variable gain control for calibrated gain performance and to
optimize noise performance. The probe main amplifier is also capable of driving the 50 ohm signal path of the probe TekConnect
interface with the host oscilloscope.

Solder-in tip connection wire length

There are four via locations for soldering wire connections between the probe tip and the measurement DUT.

The via connections includ e the probe tip A and B inputs for a differential signal and two ground connections for best performance
and flexibility in connecting to a close DUT ground. In general, the probe tip soldered wire connection length should be kept
as short as possible. In addition, the probe tip A and B input wires should be matched in length for best Differential mode
measurement performance.

The Differential input mode does not require a ground reference wire connection , since the differential measurement process
provides its own virtual ground. The single-ended input modes, w hich include A-GND mode, B-GND mode, and Com mon mode, all
require at least one ground wire connection. However, if there is room for another connection and a circuit ground near the probe
tip, hooking up a ground connection is recommended. This might help avoid a situation where a large potential on the ground plane
of the DUT cau se s the test signal to drift outside of the linear range of the input amplifier of the probe. Ideally, it is a good idea to
hook up the differential inputs and the ground to avoid clipping of the signal in the probe amplifier.

P7700 Series TriMode Probes User Manual 37

Basic operation

The measurement performance of the single-ended input modes is affected by the length of the ground wire connection, with
high frequency performance degradation increasing with increased ground wire length. The P7700 Series solder-in probe tip
performance is specified using a test fixture built with a probe tip having a signal wire length of 10 mils (.25 mm) and a ground wire
length of 66 mils (1.7 mm).

Please see the Specifications Technical Reference manual available for down load at the Tektronix web site for more detailed
specifications on wire length a s it affects tip performance.

Using offset voltage to extend P7700 series solder-in tip input voltage range

The single-ended linear dynamic ra nge of the TekFlex solder-in tip inputs is specified to be 2.5 V

, which is a range from -1.25 V

p-p

to +1.25 V with zero volt offset. The dynamic range of P7700 Series buffers is limited by the input attenuation factor, which is
2X for the solder-in probe tips as shown in the simplified drawing. (See Figure 5.) A 2X attenuation factor was selected for the
probe tips as a compromise between dynamic range and noise, since a higher attenuation factor would have increased probe
noise. Although the dynamic range of the probe tip buffer cannot be extended, it is possible to extend the range over which the tip
dynamic range window c a n be moved by adjusting the probe offset voltage. The offset voltage rang e of the TekFlex solder-in tips
is -4 V to +4 V, which is adjusted using the Probe Setup screen of the oscilloscope or the offset knobs on the oscilloscope front
panel. Using the offset voltage controls, it is possible to make measuremen ts within any 2.5 V

window between -5.25 V and

p-p

+5.25 V. For example, by setting the offset voltage to +3.0 V, it is possible to measure an HDMI signal, which has a signal swing
between about +2.8 V and +3.3 V.

38 P7700 Series TriMode Pro bes User Manual

Basic operation

Figure 5: Simplified drawing of input attenuation factor of the P7700 Series buffers

The offset voltage affects the probe tip buffer ’s measured signal through a resistive summer configuration that forms the buffer’s
input attenuator network. The high value resistors used in the buffer’s input attenuator result in an interaction between the input
signal and the offset voltage DC level.

P7700 Series TriMode Probes User Manual 39

Basic operation

Calibrated offset voltage performance requires that both the input signal and the offset voltage generator in the probe have
a source resistance that is very small compared to the 25 kΩ attenuator resistors. The source resistance of the offset voltage
generator in the probe is less than an ohm. Typically, when the probe and tip are connected to a DUT, the DUT signals have a
source resistance, RS, much less than 25 kΩ.

If a TekFlex solder-in tip is attached to a probe but not soldered to anything, the inputs will be open which effectively ma kes the
source resistance look much larger than the 25 k Ω attenuator resistors. As a result, the offset voltage control is no longer calibrated
and will have 2X their calibrated effect on the measured probe output. This effect can be helpful in troubleshooting connection
issues with the tips. If a probe tip has been soldered to a DUT and adjusting the offset voltage causes the offset to move 2X the
adjustment, it could indicate a broken solder joint that has left the probe tip input open.

Making single-ended measurements using the P77BRWSR differential probe tip

Making single-ended measurements with a TriMode probe tip, such as a TekFlex solder-in tip, is quite straightforward, because a
TriMode tip provides solder connections for a DUT ground reference for both the A and B probe inputs. Although the differential
input mode of the P7700 Series probe is normally used to make a differential signal measurement, single-ended measurements
can be made using Differential Input mode when the probe input connections and offset voltage controls are configured properly,
This single-ended configuration process is particularly important to understand when using the P77BRWSR tip, since this
variable-spacing Browser tip operates only in Differential Input mode. Differential Input mode provides a measurement of the
difference (A – B) between the A and B input signals. If the probe tip B input is connected to a DUT ground, the resulting Differential
Input mode measurement (A – 0 V) results in a display of the single-end ed A input signal response.

40 P7700 Series TriMode Pro bes User Manual

Basic operation

When making differential signal measurements, the P77BRWSR Offset Voltage control is normally set to the Common-mode (CM)
Tracking mode. With CM tracking mode active, the A and B input signals are monitored and the Offset A and Offset B settings
are both adjusted to match the DC common-mode voltage of the A and B input signals [(A + B)/2]. When making single-ended
measurements in Differential Input mode with a browser tip, the offset voltage control should be set manually, so tracking mode
should be shut off. The Offset A voltage should be set manually to the center of the A signal voltage swing. For a +5 V CMOS
logic signal; for example, the Offset A voltage should be set to +2.5 V. The A signal input voltage should then range from +5 V to
0 V, which is within the 6 V

dynamic range of the Browser tip as long as the offset voltage is set near the center of its expected

p-p

voltage swing. The Offset B voltage should also be set manually to 0 V. This Offset B voltage setting is not only at the center of the
dynamic range for a grounded B input signal, it also causes t he differential offset voltage to equal the Offset A voltage. This is true
because the differential offset voltage equals the difference between the Offset A voltage setting and the Offset B voltage setting.
The differential offset voltage is used by the oscilloscope as the displa yed offset voltage in Differential Input mode.

With the P77BRWSR tip configured for a single-ended measurement in Differential Input mode, the displayed signal voltage
should match the A input signal response and the displayed offset voltage should match the Offset A setting. Since the host
oscilloscope uses both the displayed signal voltage and displayed offset voltage in calculating its set of available oscilloscope
automated measurements, it is important that both the Differential Input mode signal voltage and offset voltage are configured
properly as shown in the following figure. (See Figure 6.)

P7700 Series TriMode Probes User Manual 41

Basic operation

Figure 6: Proper configuration of the Differen tial Input mode signal and offset voltage

42 P7700 Series TriMode Pro bes User Manual

Basic operation

The configuration process described in this section will maximize the available dynamic range of the P77BRWSR tip when
making single-ended measurements.

Temperature compensation

The P7700 Series probes employ temperature compensation to optimize measurement accuracy. Whenever a probe setting is
changed, such as Input Mode, Offset Voltage, or ve rtical scale factor, a temperature compensation update occurs. Continuous
temperature compensation is not done to avoid introducing noise into the probe amplifiers.

To maximize measurement accuracy when the probe is first powered on from a cold start condition, you must allow the probe
and oscilloscope a 20 minute warm-up period. After the warm-up period, you should adjust or toggle a probe setting, such as the
vertical scale factor, to trigger the temperature compensation update. Otherwise, a cold temperature compensation value may be
used, which would result in a small gain error.

DSP correction

The P7700 Series probes contain S-parameter characterization data for the probe, which is downloaded to the attached
oscilloscope when the probe is first connected. P7700 Series probe tips also contain S-parameter characterization data for
the tip, which is also downloaded to the attached oscilloscope when the probe t ip is attached to the probe. This probe and tip
characterization data is used to generate DSP correction filters that improves high freq uency measuremen t accuracy.

P7700 Series TriMode Probes User Manual 43

Basic operation

Solder tip measurement configuration

In many of the high-frequency signaling standards that the P7700 Series probes are designed for, a 50 Ω termination at the
transmitter is in parallel with another 50 Ω termination at the end of the transmission line path, effectively making a 25 Ω signal
source impedance. In this application, the solder tip adapter measurement con figuration is designed to pick off the transmitted
signal at a location in the signal transmission path.

The input impedance for a solder tip, Z probe, varies with frequency. For a P77STxxxx tip the DC input resistance is about 50 kΩ
and decreases with frequency above about 10 MHz to about 100 Ω a bove 10 GHz.

Figure 7: Solder tip measurement configuration

44 P7700 Series TriMode Pro bes User Manual

Connecting to a circuit board

TriMode tips are necessary to complete the connection between the P7700 Series probes and your circuit. The tips are available
as both standard and optional accessories and provide several connection options.

P77BRWSR browser and accessories (Pen
wand and hands free Tri-Pod)

The browser connects to the circuit using
two tips with very fine point tips. These tips
have built-in compliance (0.02”, 0.5 mm) and
adjustable spacing (.008-.210” (0.2-5.3 m m)).
Thebrowsercanbeheldinplacewitha
hand or can be used with the hands free
Tri-Pod accessory or a probe positioner such
as the Tektronix PPM203B. (See page 40,

Making single-ended measurements using the
P77BRWSR differential probe tip.)

Basic operation

P7700 Series TriMode Probes User Manual 45

Basic operation

The browser is a differential only probe
accessory, but can be used to measure ground
referenced, single-ended circuits as well.
When measuring a ground referenced signal,
connect the A side (positive) input to the signal
to be measured and the B side (negative) to
the ground connection.

NOTE. The pins on the browser are small and delicate, so use caution when pressing them to make a conn ection.

If a probe tip breaks, it can be easily replaced. (See page 75, Browser tip replacement.)

46 P7700 Series TriMode Pro bes User Manual

Flex circuit based solder tips

The flex circuit based solder tips are connected
to the circuit using thin (38 AWG) wire
connected to the vias on the tip. The step s
to follow when soldering the tip to the circuit
are shown in the soldering procedure section
below.

The flex circuit based solder tips support
TriMode operation. To use TriMode, a minimum
of three connections are needed, the A and B
side inputs and one of the ground connections.

Basic operation

P7700 Series TriMode Probes User Manual 47

Basic operation

The flex circuit based solder tips are made
with flex circuit material and can be ben t and
shaped to fit around or into spaces where it is
difficult to reach a test point.

The minimum bend radius for the flex tips is

1.0 in (25.4 mm). There is no impact on the

performance of the tip when it is bent into a
curved shape that confo rms to bend radius
limits.

Typical life for tips are 30 - 50 bending cycles
before replacement is needed.

48 P7700 Series TriMode Pro bes User Manual

P77STCABL Solder-in Tip

The P77STCABL solder-in tips have similar
input via connections for thin (38 AWG) wire.
The steps to follow when soldering this tip to
the circuit are identical to the flex circuit based
solder tips and are shown in the soldering
procedure section below. These tips are longer
than the flex circuit based solder tips and are
more flexible.

These tips support TriMode operation. To use
TriMode, a minimum of three connections are
needed, the A and B side inputs and one of the
ground connections.

NOTE. There is no exposed metal surface on the P77STCABL tip except for th e TriMode inputs and the TekFlex contacts.

Basic operation

P7700 Series TriMode Probes User Manual 49

Basic operation

P77C292MM, 2.92 mm Adapter

Use this adapter to connect a P7700 series
probe to a DUT with 50 Ω test point connectors.
The adapter supports testing of serial standards
such as HDMI, MIPI M-PHY, and Display Port;
cables and retainer are included.

After connecting the adapter to the flex cable,
use the retainer to provide a secure connection
to the flex cable to minimize movement or to
attach the adapter to the hand’s free tripod.

An accessory kit is available with linkage
adapters for stacking the adapters.

50 P7700 Series TriMode Pro bes User Manual

Tip soldering

CAUTION. This procedure uses equipment at high temperature. Avoid touching hot surfaces.

Recommended equipment.

Lead-free solder

4 mil diam eter (38AWG) wire (a spool of 38 AWG wire is included as a standard accessory with each P7700 Series probe)

MetCal Soldering S tation + UFTC-7CN04 (Conical UltraFine Soldering Cartridge, max tip temp 775 °F (412 °C)) or equivalent

Solder-Wick Rosin SD Size #1 (80-1-10) or equivalent

Tweezers and sharp wire cutters

Basic operation

P7700 Series TriMode Probes User Manual 51

Basic operation

Tip soldering procedure. Keep the wires short as possible for best signal fidelity. Soldering wires first to the test points and

then attaching the P7700 Solder tips is the best way to keep wire lengths short.

1. Solder wires to the test points. Cut wires
with different lengths. This will make it
easier to thread the wires onto the solder
tips.

52 P7700 Series TriMode Pro bes User Manual

2. Thread tip onto wires. The two middle vias

are the A(+) and B(-) inputs of the tip.

You m a y find it useful to use the double-sided
foam tape that was shipped with your probe to
holdtheprobetipinplace.

NOTE. The double-sided foam tape is only

good for one use. For maximum strain relief,
always use a fresh piece of tape each time you
attach a tip.

Basic operation

P7700 Series TriMode Probes User Manual 53

Basic operation

3. With the tip in position, quickly solder the
wires to the vias. If the soldering iron is
left too long on the tip, it may cause the
0201 input resistors to reflow and move.

54 P7700 Series TriMode Pro bes User Manual

4. Trim wires flush with the board on the

probe tip.

Basic operation

P7700 Series TriMode Probes User Manual 55

Basic operation

5. Attach the ground wire for TriMode input to
the P7700 probe. First add solder to the
test point and the nearest ground via on
the solder tip.

56 P7700 Series TriMode Pro bes User Manual

6. Second, solder a short piece of wire

between the ground via on the tip and
the ground test point. This configuration
optimizes the p erformance of the probe for
differential measurements. Longer wires
on the ground path will have an impact on
Single-Ended Mode and Common Mode
performance. If there is a ground test point
conveniently placed, it would be best to
use the same solder technique shown on
the A and B inputs of the tip to ensure
the shortest ground path. Once the tip is
fully soldered in place, it is recommended
to firmly secure the tip to the board using
additional foam tape or hot melt glue.

Basic operation

P7700 Series TriMode Probes User Manual 57

Basic operation

Tip unsoldering procedure.

1. Use small solder-wick to remove the solder

and wire from the tip ground via. Size
#1 Solder-Wick is recommended due to
the small size of the tip and vias. Do not
place the solder wick over the 0201 input
resistors and these parts might accidentally
be unsoldered from the board.

58 P7700 Series TriMode Pro bes User Manual

2. Use the solder-wick to remove excess

solder from the input vias. Again, be
careful not to place the solder-wick too
close to the input resistors.

Basic operation

P7700 Series TriMode Probes User Manual 59

Basic operation

3. If the solder cannot be fully removed from

If you used double-sided foam tape for strain
relief rocking and moving the tip from side to
side will loosen the tape's adhesion to the tip.
Do not try to pull the tip dire ct ly off of the tape.
Pulling the tip up without first breaking the
tape's adhesion can damage the tip.

the input via while attached to the test
points, it is possible rock the tip side to
side while reflowing the solder in the vias.
Since the wires are cut flush to the board,
the tip can be slowly removed from the
wires using this method. Once the tip has
been removed from the board, use the
solderwick to clean out the vias so the tip
can be reused.

60 P7700 Series TriMode Pro bes User Manual

Precautions when connecting to the circuit

To achieve the best performance and service life of the probe and tips, observe the best practices below when you make
connections:

Wear the antistatic wrist strap that is supplied with the probe and work at an a ntistatic-approved workstation.

The fl ex circuit based solder tips are built with flexible circuit board material and are susceptible to mechanical overstress and
harsh handling particularly at the ends of the probe tip where the components are mounted. Always support the probe tips by
taping or gluing the m to your circuit or by providing a means to prevent strain on the tips and circuit connections.

The flex circuit based solder tips contain active circuitry. The majority of the tips, including the cover on the buffer amplifier,
are non-conductive surfaces. Ho weve r, the back end of the tips includes some small surface m ount devices and pads on
the top that present a small risk of shorting with the DUT circuitry. This was necessary to minimize the size and weight of
the probe tips. If you need to use the flex circuit based solder tips where their topside components might contact the DUT,
take care to avoid shorting the exposed circuitry of the tips to the DUT circuitry. Covering these are as with non-conductive
tape is one m ethod to avoid shorting.

The P77STCABL tip is designed to be more flexible than the flex circuit based solder tips; care should be taken to avoid
bending the connecting ca bles at too sharp an angle, since overstress can cause damage or reduce signal performance.

To preserve the cables and maintain the highest signal fidelity, never kink the wires or put undue stress on them. Support the
probe head by taping it t o your circuit or providing a means to prevent strain on the circuit connection.

Basic operation

P7700 Series TriMode Probes User Manual 61

Basic operation

Care of P77STFLXA tips

CAUTION. The top of the tips contain a ctive components and can cause shorting if th e tips are mounted top-down and the

discrete components on the back end of the tips come into contact with an active circuit. Ensure that metal components do not
touch anything else.

If the tips are mounted with the top up or if the TekFlex connector is attached, it is unlikely that the components on the board will
contact the active circuit. The covers on the buffer amplifie r of the tips are non-conductive. There are no co nductive surfaces
on the bottom of the tips except for the TriMode inputs and the TekFlex co ntacts.

62 P7700 Series TriMode Pro bes User Manual

Tip dimensions

The dimensions of the solder tip connections
are provided here for reference. You can also
design the tip footprint into your circuit board
layout for easier test connections.

Basic operation

P7700 Series TriMode Probes User Manual 63

Probe handling best practices

Probe handling best practices

Tektronix TriMode probes are quality measurement tools and should be treated with care to avoid damage or performance
degradation due to mishandling. Take the following precautions when handling the probe cables:

Never over-bend the probe main or tip cables, which can put a permanent kink into the cable. When storing the probe do no t
coil it too tightly. It is best to use the protective foam carrying case which is designed to not exceed the minimum bend radius
for the cable of 2.5 inches. The minimum bend radius for the flex cable is 0.25 inches (6.35 mm).

To maximize probe life, limit the amount of cable twist relative to the probe comp box to ±180 degrees. Always uncoil a probe
cable gently before applying the twisting forces needed to orient the probe head for connection to the probe tip.

64 P7700 Series TriMode Pro bes User Manual

Probe handling best practices

Do not excessively pull or twist the probe cables when positioning the probe for measurements.

Never crush the cable, as will occur when you run over the probe with a chair wheel or drop something heavy on the ca ble.

P7700 Series TriMode Probes User Manual 65

S-parameter information

S-parameter information

The S-parameter files for the Tektronix P77 20 probe are unique to each serial numbered probe and accessory tip. The files
are stored on the oscilloscope in a file structure that corresponds to the p robe, tip, and serial numbers. The root path for the
folders containing the S-parameter is
the instrument model, such as D PO73304). Starting in this folder, look through the folders for the probe, tip model numbers, and
serial numbers. At the lowest level, there are

The S-parameter file names correspond to the
various settings of the TriMode feature and the
gain setting of the probe. For example, if the
file name is x_1X_A_0_25X.3Sp, the TriMode
setting is: single-ended A mode, Gain setting =

0.25 (4x attenuation).

Choose a .s3p file that matches the TriMode
setting that you are using, single-ended (A
or B), differential (D), o r common mode (C).
The gain setting does not matter for the PSD
model. No te that for browser tips, only D mode
is supported.

CAUTION. Changing or deleting the

S-parameter files can cause the probes not
operate properly. To avoid problems, do not
change or delete the S-parameter files.

C:\ProgramData\Tektronix\TekScope\Instrumment (where Instrument is

.s3p files unique to the probe and tip.

66 P7700 Series TriMode Pro bes User Manual

Accessories and options

You can reorder the following replacement parts and accessories. Note that in some cases, the reorder quantities may differ
from those that ship with the probe.

Standard accessories

The following a ccessories are shipped with the P7700 Series probes. If no quantity is listed, only one of that item is shipped.

Standard accessory

Accessories and options

Reorder part number
and quantity Description

202-0545-xx Wood box carry ing case with inserts. This carrying case

has several com partments to hold the probe and accessories.

P77STFLXA Active tips (3 solder tips)

020-3167-xx Adhesive tape

016-1948-xx

121-1003-xx Magnetic bar

129-1867-xx (.450” ID)
and

129-1857-xx (.270” ID)

017-0103-xx

071-7386-xx

Color bands

Metal cable bands

Wire kit (38 AWG, 4 mil)

Accessory re-order and info card

P7700 Series TriMode Probes User Manual 67

Accessories and options

Standard accessory

Reorder part number
and quantity Description

006-3415-xx Antistatic wrist strap. When you use the probe, always work

at an antistatic work station and wear the antistatic wrist strap.

–

Calibration certificate. Acertificate of traceable calibration
is provided with every probe.

–

Data calibration report. The Data Calibration Report lists
the manufacturing test results of your probe at t he time of
shipment and is included with every probe.

68 P7700 Series TriMode Pro bes User Manual

Standard accessory

Reorder part number
and quantity Description

071–3421–xx

User manual. The manual provides instructions for using the
P7700 Series TriMode Probes. Other documents, such as th e
technical reference and other probe literature are located on
the Tektronix web site (www.tek.com/manuals).

Accessories and options

067-4889-xx

DC probe calibration fixture. Use this fixture to perform a
DC compensation with the host instrument.

P7700 Series TriMode Probes User Manual 69

Accessories and options

Optional accessories

Optional accessory Part and description

P77STCABL, Solder-in active tip

This tip provides a soldered, multi-point connection that
supports full TriMode measurement capabilities at full probe
bandwidth.

Flex circuit based solder tips

These tips use flex circuit material and provide soldered,
multi-point connections. They s upports full TriMode
measurement capabilities and full p robe bandwidth .

P77DESKEW, Deskew fixture

Use this fixture to deskew up to 2 probes at once or to perform
a probe f unctional check. A USB power cable is provided.

70 P7700 Series TriMode Pro bes User Manual

Optional accessory Part and description

P77BRWSR, Browser accessory includes th ese items:

Browser wand. Extends the length of the browser for a
more comfortable grip. (Part number 020 -3160-xx.)

Browser hands-free tripod. Holds the browser o n a test
point without the need to use your hands. (Part number
020-3161-xx.)

Browser replacement tips. Use to repair any browser
tips that are broken with use. (Part number 020-3162-xx.)

Adapter attachm e nt. Attaches the b rowser to the
hands-free tri-pod or other holders.

Ground lead. Attaches the browser to a circuit ground
if necessary.

ThebrowseraccessoriescanbestoredintheTekFlex
accessories box that comes stand ard with every
P7700 series probe.

Accessories and options

P7700 Series TriMode Probes User Manual 71

Accessories and options

Optional accessory Part and description

407-6019-xx, Probe adapter

Use this accessory to attach the browser to the PPM203B.
probe arm/positioner

P77C292MM, 2.92 mm adapter

Use this adapter to connect a P7700 series p robe to a DUT
with 50 Ω test point connectors.

72 P7700 Series TriMode Pro bes User Manual

Optional accessory Part and description

020-3179-xx, Linkage adapter kit

Use the adapters for stacking two or more P77C292MM

2.92 mm adapters.

Use two gray adapters to stack two P77C292MM ad apters;
use two black adapters to stack three o r four P77C292MM
adapters.

Insert the linkage adapters into the P77C292MM adapters as
shown (gray linkage adapters shown).

Accessories and options

P7700 Series TriMode Probes User Manual 73

Maintenance

Maintenance

This section contains maintenance and support information for your probe.

Host instrument firmware

Some oscilloscopes might require a firmware upgrade to support full functionality of the P7700 Series probes. Instruments with
lower versions of firmware might not display all probe controls and indicators on screen, and in some cases require you to
power-cycle the instrument to restore normal instrument operation.

The following table lists the required versions of instrument firmware for some of the oscilloscopes that currently support the
P7700 Series probes.

Instrument Firmware version

MSO/DSA/DPO70000C Series oscilloscope

DSA/DPO70000D Series oscilloscope

MSO/DPO70000DX Series oscilloscope

DSO70000SX Series oscilloscopes

To check the firmware version on Windows-based instruments, from the menu bar, click Help/About TekScope. If you need to
upgrade your instrument firmware, go to www.tek.com/downloads to download the latest firmware.

V 10.7.1 or higher

V 10.7.1 or higher

V 10.7.1 or higher

V 10.7.1 or higher

74 P7700 Series TriMode Pro bes User Manual

Browser tip replacement

NOTE. Note: It may be helpful to have a magnifying device or glasses when performing this operation.

Although the P77BRWSR’s tips are design to withstand up to 4 lbs (1.8 kg.), they can break during use. If one of the tips on your
browser breaks, it is easy to replace the tip with a new one an d be ready to make measurements again in a few seconds. To
replace the tip, you will need a pair of tweezers. Using the tweezers, grip the shaft of the tip and pull downward to remove it.
Dispose of the broken tip.

Once the old tip has been removed, retrieve a new, replacement tip from its storage vial in the accessory kit. Grip the replacement
tip with the tweezers, gently push the tip into the socket on the bro wser’s front end.

Maintenance

P7700 Series TriMode Probes User Manual 75

Maintenance

Error conditions

LED indicators

If one of the Input Mode LEDs does not remain on after you connect the probe, an internal probe diagnostic fault exists. Disconnect
and reconnect the probe to restart the power-on diagnostic sequence. If the symptoms continue, connect the probe to anothe r
oscilloscope channel or oscilloscope. If the symptoms remain, return the probe to Tektronix for repair.

There is an amber-colored WARNING indicator LED located on the top plate of the probe comp box. This LED turns on when any of
the following conditions exist and remains on until the problem condition is cleared:

Probe power-on self-test failure (clear by disconnecting and reconnecting the probe)

Probe tip over-temperature detected (may require forced air to be applied to cool the tip)

Probe input over-voltage detected (reduce input over-voltage to clear)

76 P7700 Series TriMode Pro bes User Manual

Signal display

If the probe is conne cted to an active signal source and you do not see the signal displayed on the oscilloscope:

Perform an Autoset operation on the host oscilloscope. This will automatically adjust the oscilloscope settings to try to
display a useable waveform.

Check the probe tip connection at the probe TekFlex connector. The LED on to p of the accessory tip should be on if the
tip is connected properly.

Check that the input signal is within the allowable input voltage range. The Auto Offset control in the Probe Setup menu can be
used to set the offset of the probe voltages to maximize the probe tip input dynamic range.

Perform a functional check procedure. (See page 11, Functional check.) This procedure will check that the probe is operating
properly.

Maintenance

P7700 Series TriMode Probes User Manual 77

Maintenance

Measurement errors

If you suspect that your measurement may not be accurate, and you are using a solder in connection, check that the solder
tip signal and ground connections are correct and intact.

Checking the signal measurement in some of the other TriMode Input modes may provide some clue if there is a measurement
problem. For example, operating the probe in DIFF mode does not require a ground connection. Switching the input mode
between DIFF and SE might point out a grounding problem

If the signal being measured is a differential s ignal, temporarily swtich the TriMode input on the probe to A only and B only and
verify that each component of the differential signal looks correct. Switch the probe’s input to the common mode setting and
see if there is a large and unexpected common mode signal present on the probe input.

Remove the tip from the DUT and perform a DC Probe CAL operation on the probe. Passing this DC CAL check will verify
that the probe DC performance is operating within allowable limits and will optimize the probe DC gain and offset. (See
page 18, TriMode probe DC calibration.)

Perform a Functional Check operation on the probe. This should verify that a fast rise time signal can be measured by the
probe with a comparable probe tip attached. (See page 11, Fun c tional check.)

78 P7700 Series TriMode Pro bes User Manual

Handling the probe

This probe is a precision high-frequency device; exercise care when you use and store the probe. The probe and cable are
susceptible to damage caused by careless use. Always handle the probe at the comp box and probe body to avoid undue physical
strain to the probe cable, such as kinking, excessive bending, or pulling. Visible dents in the cable will increase signal aberrations.

CAUTION. To prevent da mage to the probe, always use an antistatic wrist strap connected to a static-controlled workstation when

you handle the probe. The probe input contains electronic components that can be damaged by contact with high voltages,
including static discharge.

Observe the following precautions when using the probe. Do not do any of the following:

Drop the probe or subject it to physical shock

Subject the probe to a dverse weather conditions

Kink or fold the probe main cable tighter than a 2.5 inch radius; minimum bend radius for the solder tips is 0.25 inch (6.35 mm)

Solder the tips with excessive heat or duration

Injure yourself with the sharp tips

(See page 64, Probe handling best practices.)

Maintenance

P7700 Series TriMode Probes User Manual 79

Maintenance

Cleaning the probe

CAUTION. To prevent damage to the probe, do not expose it to sprays, liquids, or solvents. Avoid getting moisture inside

the probe during exterior cleaning.

Do not use chemical cleaning agents; they may damage the probe. Avoid using chemicals that contain benzine , benzene,
toluene, xylene, acetone, or similar solvents.

Clean the exterior surfaces of the probe with a dry, lint-free cloth or a soft-bristle brush. If dirt remains, use a soft cloth or swab
dampened with a 75% isopropyl alcohol solution and rinse with deionized water. A swab is useful to clean narrow spaces on the
probe; use only enough solution to dampen the swab or cloth. Do not use abrasive compounds on any part of the probe.

80 P7700 Series TriMode Pro bes User Manual

Returning the probe for servicing

If your probe requires servicing, you must return it to Tektronix. If the original packaging is unfit for use or not available, use
the following packaging guidelines:

Preparation for Shipment

1. Use a corrugated cardboard shipping

carton having inside dimensions at
least one inch greater than the probe
dimensions. The box should have a carton
test strength of at least 200 pounds.

2. Put the p robe into an antistatic bag or wrap

it to protect it from dampness.

3. Place the probe into the box and stabilize it

with light packing material.

4. Seal the carton with shipping tape.

5. Refer to Contacting Tektronix at the

beginning of this manual for the shipping
address.

Maintenance

P7700 Series TriMode Probes User Manual 81

Maintenance

82 P7700 Series TriMode Pro bes User Manual

Index

Index

A

accessories

optional, 70
standard, 67

Auto Offset, 32

B

browser tip dynamic range, 41

C

calibration

probe, 18
probe DC, 20

TriMode, 18
cleaning the probe, 80
compensation

temperature, 43
connecting

tips to the probe TekFlex

connector, 7
connecting to a circuit board, 45
connecting to circuit with

coaxial adapters, 45

controls and indicators

TriMode, 10

D

dimensions

solder tips, 63
documentation, vii, 69
DSP correction, 43
dynamic range

browser tip, 41

E

error conditions

LED indicators, 76

measurement errors, 78

signal display, 77

F

firmware, 74
flex circuit description, 47

functional check, 11

with deskew fixture, 13

with P77C292MM adapter, 15

H

handling the probe, 64, 79
host instrument firmware, 74

I

improving measurement accuracy, 36
Input Mode selection, 29
input network, 38
input voltage range

extend using offset voltage, 38

installation

connecting accessories, 7
overview, 4

L

LED indicators, 6, 9, 76

M

measurement accuracy

P7700 Series TriMode Probes User Manual 83

Index

improving, 36

measurement configuration

solder tip, 44
measurement errors, 78
models, vii

O

offset selection, 31
offset voltage, 25
offset voltage buttons, 32
operating considerations, 2
optional accessories, 70

P

P77BRWSR description, 45
P77C292MM adapter, 50

termination voltage, 33
P77STCABL, 49
probe

calibrating, 20

cleaning, 80

handling, 64, 79
probe architecture, 36

probe connection precautions, 61
Probe Controls screen, 35
probe models, vii
Probe Setup screen, 28

input mode selection, 29
offset selection, 31
offset voltage set buttons, 32
probe tip information, 35

probe tip information, 35

R

replacing tips, 75
returning the probe, 81

S

S-parameter files

storage file structure, 66
signal display errors, 77
single-ended measurements

using browser differential probe

tip, 40
solder tip dimensions, 63
solder tips

caring for, 62

solder-in tips

P77STCABL, 49

standard accessories, 67

T

TekFlex

connecting accessories, 7
temperature compensation, 43
termination voltage, 33
tip replaement, 75
tip soldering, 51
tri-pod accessory, 45
TriMode

calibration, 18

probing, 10
TriMode d ifferential probe tip

making single-ended

measurements, 40

W

wire length

solder-in tip connection, 37

84 P7700 Series TriMode Pro bes User Manual