x
P7600 Series
TriMode™ Probes
ZZZ
User Manual
*P071302602*
071-3026-02
xx
P7600 Series
TriMode™ Probes
ZZZ
User Manual
www.tek.com
071-3026-02
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.
EZ-Probe is a registered trademark of Cascade Microtech, Inc.
TriMode is a trademark 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
General safety summary .. . ................................................................................................................ iii
Environmental Considerations .............................................................................................................. v
Preface...................................................................................................................................... vi
Probe Models ......................................................................................................................... vi
Documentation........................................................................................................................ vi
Key Features ............................................................................................................................... 1
Operating Considerations .................................................................................................................. 2
Installation .................................................................................................................................. 3
Overview .............................................................................................................................. 3
Connect TriMode Adapters to the Probe Body. ...................................................................................... 4
Connect to the Host Instrument . . . ................................................................................................... 6
Control Box Controls and Indicators.................................................................................................. 8
Functional Check and Calibration......................................................................................................... 11
Functional Check .................................................................................................................... 11
TriMode Probe DC Calibration.......................................................................................................15
Basic Operation............................................................................................................................ 20
Probe Setup Screen ................................................................................................................. 25
Selecting theProbe Tip .............................................................................................................. 33
Improving Measurement Accuracy .................................................................................................. 34
Table of Contents
P7600 Series TriMode Probes User Manual i
Table of Contents
Accessories and Options.................................................................................................................. 49
Maintenance ............................................................................................................................... 61
Index
Connecting to a Circuit Board . . ..................................................................................................... 39
Standard Accessories . .............................................................................................................. 49
Optional Accessories ................................................................................................................ 53
Options............................................................................................................................... 60
Host Instrument Firmware ........................................................................................................... 61
Error Conditions...................................................................................................................... 62
User-Replaceable Parts ............................................................................................................. 64
Handling the Probe .................................................................................................................. 68
Cleaning the Probe .................................................................................................................. 69
Returning the Probe for Servicing...................................................................................................70
ii P7600 Series TriMode Probes User Manual
General safety summary
Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it.
To avoid potential hazards, use this product only as specified.
Only qualified personnel should pe rform service procedures.
To avoid fire or personal injury
Connect and disconnect properly. Connect th e probe output to the measurement instrument before connecting the probe to the
circuit under test. C onnect the probe reference lead to the circuit under test before connecting the probe input. Disconnect the probe
input and th e probe reference lead from the circuit under test before d isconnecting the probe from the measurement instrument.
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.
Do not operate with suspected failures. If you suspect that there is damage to this product, have it inspected by qualified
service personnel.
Avoid exposed circuitry. Do not touch exposed connections and components when power is present.
Do not operate in wet/d amp conditions.
General safety summary
Do not operate in an explosive atmosphere.
Keep product surfaces clean and dry.
P7600 Series TriMode Probes User Manual iii
General safety summary
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.
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.
The following symbol(s) may appear on the product:
iv P7600 Series TriMode Pro bes User Manual
Environmental Considerations
This section provides information about the environmental impact of the product.
Product End-of-Life Handling
Observe the following guidelines when recycling an instrument or component:
Equipment Recycling. Production of this eq uipment required the extraction and use of natural resources. The equipment may
contain substances that could be harmful to the environm ent or human health if improperly handled at the product’s end of life. In
order to avoid release of such substances into the environment and to reduce the use of natural resources, we encourage you to
recycle this product in an appropriate system that will ensure that most of the materials are reused or recycled 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 options, che ck the Tektronix Web site (www.tek.com/productrecycling).
Environmental Considerations
P7600 Series TriMode Probes User Manual v
Preface
Preface
This manual describes the installation and operation of the P7600 Series TriMode Probes. Basic p robe operations and
concepts are presented in this manual. All documents listed below are located on the Tektronix Web site for these documents
(www.tektronix.com/manuals).
Probe Models
The probe models covered in the P7600 Series TriMode Probes documentation are listed below.
P7625 25 GHz
P7633 33 GHz
Documentation
To read about Use these documen ts
Installation and operation (overviews) Read this quick start user manual for general information about how to use
In-depth operation
Specifications Use the technical reference manual.
Reordering accessories
your probe.
Use the technical reference manual along with the user manual.
Use the Accessories and Options section in this manual.
vi P7600 Series TriMode Probes User Manual
Key Features
The P7600 Series TriMode Probes allow you to take differential, single-ended, and common mode measurements with one probe
connection. Key features includ e:
Revolutionary TriMode operation
TekConnect interface
>33 GHz Bandwidth (typical, P7633)
14 ps Rise time 10-90% (typical, P7633)
Key Features
<1.1 mV
adapters
Automatic tip adapter type identification
DSP-corrected response provided for
improved measurement fidelity
P7600 Series TriMode Probes User Manual 1
System noise with P76CA-xxx
RMS
Operating Considerations
Operating Considerations
Table 1: P7600 Series TriMode Probes
Characteristic Description P76CA-xxx adapters P76TA adapter
Input voltage Dynamic range
Input voltage ran ge
(DC + peak AC, input referenced
to ground)
Maximum no ndestructive voltage ±5 V ±8 V
Temperature
Humidity
Altitude
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.
Operating
Nonoperating
Operating
Nonoperating
Operating
Nonoperating
1.2 V
2.0 V
(single-ended)
p-p
(differential)
p-p
6.0 V
10.0 V
(single-ended)
p-p
(differential)
p-p
+4.0 V, –4.0 V +5.0 V, –5.0 V
0 to +40 °C (+32 °F to +104 °F)
-20°Cto+60°C(-4°Fto+140°F)
Up to +40 °C (+104 °F) 20%-80% RH
+30 °C to +46 °C (+86 °F to +115 °F) 0-90% RH
3000 meters (9842 feet)
12000 meters (39,370 feet)
2 P7600 Series TriMode Probes User Manual
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 a P76xxx adapter to the probe. This step should be done before you connect the probe to the oscilloscope.
2. Connect the probe to the oscilloscope.
3. The probe performs a self test, and then one Input Mod e LED remains lit.
4. The oscilloscope discovers the probe (if this is the first time they are connected), and downloads S-parameter data from the
probe. The oscilloscope then computes the filters. A message displays until the process is complete.
5. The P robe Setup screen displays (if this is a first-time connection).
6. Perform a functional check on th e probe.
7. Use the Probe Setup screen to set the probe parameters as described in the Basic Operation section.
Installation
P7600 Series TriMode Probes User Manual 3
Installation
Connect TriMode Adapters to the Probe Body
TriMode adapters are required to complete the connection between the probe and your circuit, and are briefly de scribed below. The
adapters connect the P7600 Series probes to your circuit through 2.92 mm or SMP cables, or through P7500 Series solder tips,
such as the P75PST Performance Solder Tip. The adapter inputs are polarized, with the A input marked in red and the B input
marked in black. The adapters should be connected to the probe before the probe is connected to the instrument.
1. P76CA-292
Use this adapter with high quality,
skew-matched cables that have male
2.92 mm connectors at the probe end. The
other end of the cables can be customized with
connectors that mate to your circuit.
2. P76CA-292C
This adapter includes a pair of skew-matched,
6 inch cables with male 2.92 mm connectors.
3. P76CA-SMP
This adapter includes a pair of skew-matched,
6 inch cables with female SMP connectors.
4. P76TA
Use this adapter with P7500 Series probe
solder tips. (See page 39, Connecting to a
Circuit Board.)
4 P7600 Series TriMode Probes User Manual
Connect th e Adapters
All of the adapters mate to the P7600 Series
probe head through a keyed, multi-pin
connector that transfers the adapter information
to the oscilloscope for automatic identification.
Connect them as follows:
1. Orient the adapter to the probe body with
the A and B inputs on top, as shown.
2. Insert the adapter into the probe head.
3. Attach the adapter to the probe head with
the hex tool included with the probe. Use
the long end of the tool as shown, a nd only
use enough force to ensure a secure fit.
CAUTION. As you tighten the adapter screw,
be careful not to damage the input cables on
adapters with integral cables.
CAUTION. Do not overtighten the adapter
screw. You can damage the connectors if you
apply too much torque to the screw.
Installation
P7600 Series TriMode Probes User Manual 5
Installation
Connect to the Host Instrument
NOTE. Your TekConnect instrument may
require a firmware upgrade to support full
functionality of the P7600 Series probes.
Before you connect the probe, check the
version requirements. (See page 61, Host
Instrument Firmware.)
1. Slide the probe into the TekConnect
receptacle. The probe clicks into place
when fully engaged.
2. 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 pull the
probe away from the instrument.
6 P7600 Series TriMode Probes User Manual
Probe Power-On
After the initial connection to the oscilloscope
is made:
1. The probe briefly lights all LEDs during a
self-test, and then the A – B Input Mode
LED remains lit.
2. The probe transfers data 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 done when the host instrument
discovers a new probe. 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 functional check and calibration.
(See page 11, Functional Check.)
Installation
P7600 Series TriMode Probes User Manual 7
Installation
Control Box Controls and Indicators
Input Mode Button and LEDs
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)
NOTE. You can also change the Input Mode
in the oscilloscope Probe Setup screen. (See
Figure 4 on page 25.)
8 P7600 Series TriMode Probes User Manual
Installation
Overload LED
The Overload LED glows amber under the
following conditions when using the P76CA-xxx
adapters:
• the input voltage on either the A or B input
exceeds ±4.5 V
• the termination voltage driver current on
the A or B input exceeds 50 mA
(See page 23, Termination Voltage.)
The Overload LED clears when the input sign al
is removed.
NOTE. The Overload LED may flash briefly
when you ad just the termination voltage levels;
this is normal.
CAUTION. Do not exceed the input voltage limits of the probe and adapters. The probe or oscilloscope circuits may be damaged if
the limits are exceeded. Make sure that you understa nd and work within the limits of the probe and adapters.
P7600 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 HDMI signal (one
half-lane) on the A and B inputs. The resultant
differential waveform and common-mode
voltage are shown.
10 P7600 Series TriMode Probes User Manual
Functional Check and Calibration
After you connect the probe to the oscilloscope, perform a functional check using the procedu re below.
Functional Check
This procedure checks the four TriMode settings on th e probe, using the FAST EDGE connection on the front pane l of the
oscilloscope. The A-B (differential mode) is set up and verified first, and then the remaining input modes are checked and
compared to the differential m ode measurement.
Table 2: Required Equipment
Item description Performance requiremen t Recommended example
Oscilloscope TekConnect Interface Tektronix DPO73304DX or DPO72504DX
Probe adapter
Coaxi
al cable
Adapter
Probe calibration
fixture
P76CA-xxx or P76TA probe
adapter
SMA, 5
0 Ω, male-to-male
SMP-to-SMA Fairview Microwave part number SM8810
Interconnect between P76TA
adapter and oscilloscope
Functional Check and Calibration
P76CA-292C (connects directly to oscilloscope FAST EDGE connector)
P76CA-292 (requires a coaxial cable)
P76CA-SMP (requires an SMP-to-SMA adapter)
P76TA (requires a coaxial cable and the calibration fixture listed below)
Tektronix part number 174-1120-xx
Tektronix part number 067-1821-xx
P7600 Series TriMode Probes User Manual 11
Functional Check and Calibration
Test Setup
1. Connect the probe to any channel (1–4) of
the oscilloscope.
2. Set the oscilloscope to display the channel.
3. Connect one of the probe inputs to the
FAST EDGE output of the oscilloscope,
using the P76CA-292C adapter.
You can also make the connection with one
of the other P76xxx adapters, but you must
use additional equipment. Refer to the
Required Equipment table. (See Table 2
on page 11.)
4. Leave the other probe input open.
5. Set the termination and offset voltages to
0 volts in the Probe Setup screen. (From
the oscilloscope menu, select Vertical and
then select Probe Cal.)
12 P7600 Series TriMode Probes User Manual
Test Procedure
6. Set the probe Input Mode to A–B.
7. Adjust the oscilloscope to trigger on and
display a stable waveform (or press the
Autoset button).
NOTE. If you do not see a waveform, check
the connection at the probe body. (See page 4,
Connect TriMode Adapters to the Probe Body.)
8. When you see a stable square wave,
check the amplitude. (Use the horizontal
cursors.) Signal output levels for some
oscilloscope models are listed below.
DPO73304DX: 440 mV p-p
DPO72504DX: 440 mV p-p
Functional Check and Calibration
P7600 Series TriMode Probes User Manual 13
Functional Check and Calibration
9. Cycle the Input Mode button through the
remaining selections and compare the
displayed waveforms to the waveform that
you measured in step 8.
A – B (the waveform from step 8)
A – GND (same amplitude and polarity
as measured in step 8)
B – GND (the B input is grounded; no
signal is measured)
(A+B)/2 – G ND (half-amplitude, but the
same polarity a s measured in step 8)
10. Repeat steps 3 through 9 for the other
probe input. Note that with the FAST
EDGE signal now applied to the B input
and with the A input open, the polarity of
the A–B waveform is inverted.
14 P7600 Series TriMode Probes User Manual
TriMode Probe DC Calibration
After you perform a functional check of the probe, 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. Individual 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 3 : Required Equipment for Probe Calibration
Item description Performance requirement Recommended example
Oscilloscope TekConnect Interface Tektronix DPO73304DX, DPO72504DX
Test fixture Probe DC calibration fixture
Adapter (any one of the adapters listed
can be used)
Coaxial cable BNC, 50Ω, male-to-male
1
Nine-digit part numbers (xxx-xxxx-xx) are Tektronix part numbers.
2
Standard accessory included with probe. (See page 17.)
Interconnect between probe head and
probe calibration fixture
Functional Check and Calibration
1
067-3259-xx
2
P76CA-292C
P76CA-292 and two SMA cables
P76CA-SMP
P76TA
012-0208-xx
2
P7600 Series TriMode Probes User Manual 15
Functional Check and Calibration
Check the Instru ment Calibration
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, calibrate the probe. (See page 18,
Calibrate the Probe.)
16 P7600 Series TriMode Probes User Manual
Functional Check and Calibration
DC Calibration Fixture
The DC calibration fixture is shipped with
the probe and is used to automatically check
and adjust the probe gain and offset to the
connected oscilloscope channel.
1. The fixtu re is powered and automated
by a TekConnect control box adapter
that connects to the oscilloscope Aux In
connector.
2. Output connectors on the fixture board
accommodate the coaxial adapte rs and
solder tips that are used with the probe.
3. The Probe Cal signal from the front panel
of the oscilloscope connects through a
cable to the BNC connector on the fixture.
A BNC ca ble is included with the probe.
Fixture Notes. The control box should be connected to the fixture before it is connected to the oscilloscope. Although any input
channel can be used, using th e Aux In channel allows channels 1–4 to be used for the calibrated probe(s).
WARNING. To avoid damaging the fixture, only apply power to the fixturewhenitisonaflat, nonconductive surface. The bottom
of the fixture board contains exposed circuitry.
P7600 Series TriMode Probes User Manual 17
Functional Check and Calibration
Calibrate the Probe
You must calibrate the probe once on each
oscilloscope channel that you intend to use.
The probe calibration data is then stored for
future use on those channels.
1. Connect the probe to any channel (1–4) of
the oscilloscope.
2. Set the oscilloscope to display the channel.
3. Connect the probe A and B inputs to the A
and B inputs on the TriMode DC Calibration
board, using the connectors that mate to
the adapter/tip you are using.
4. Connect a BNC cable from the DC Probe
Cal output connector on the oscilloscope
to the BNC connector on the TriMode DC
Calibration board.
5. Connect the cable from the TekConnect
control box adapter to the connector on the
calibration board.
6. Connect the control box to the Aux
In channel on the o scilloscope. Allow
the fixture and probe to warm up for
20 minutes.
18 P7600 Series TriMode Probes User Manual
7. In the m enu bar, select Vertical and then
select Probe Cal.
The Probe Setup dialog box appears.
8. Select the Channel tab for the channel that
the probe is plugged into.
9. Select Compensate Probe.
The probe calibration routine runs,
optimizing the prob e to the oscilloscope for
each input mode setting.
NOTE. A switching relay on the fixture emits a
noise when the calibration runs; this is normal.
10. When the calibration routine completes,
Compensated appea rs in the Probe
Status box.
NOTE. IftheProbeCalroutinefails,check
the connections at the probe body and on the
calibration board.
Functional Check and Calibration
P7600 Series TriMode Probes User Manual 19
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 and Termination Voltage controls. (The A
and B input voltages shown represent the probe when used with the coaxial adapters; the P76TA adapter allows for ±5 V input
levels at the P7500 probe tip.) The probe has two symmetrical signal inputs, the A input and the B input, which you can display
independently o r in combination by selecting the appropriate probe input mode. The prob e also has independent Offset Voltage and
Termination Voltage controls for the probe A and B input signals.
Figure 1: Simplified input model
20 P7600 Series TriMode Probes User Manual
Basic Operation
Using the Offset and Termination 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 may also be dependent on the input mode selected. (See Figure 2 on page 22.) T he p robe 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.
Use the Termination Voltage to minimize t he 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 had been inserted. Unlike a DC block,
however, the signal DC voltage is still present at the probe input and may also require you to adjust the Offset Voltage to move the
signal into the probe input dynamic range. There are also some signal measurement applications that benefit from the availability of
an adjustable termination voltage and avoid the need for a pair of bias tees.
To set the offset and termination voltages on the probe, you can use the controls in the Probe Setup screen. (See Figure 4 on
page 25.) To display the Probe Setup screen, select Probe Cal from the oscilloscope Vertical menu.
P7600 Series TriMode Probes User Manual 21
Basic Operation
Offset Voltage. The Offset Voltage adjusts the probe input dynamic range within the larger probe input operating range, as
shown in the diagrams below. 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 independently for each of the four input modes.
Figure 2: Input dynamic range
22 P7600 Series TriMode Probes User Manual
Basic Operation
Termination Voltage. The termination voltage adjusts the effective probe DC loading of the 50 ohm input termination. The
probe A and B Termination Voltages are s et and stored independently for each of the four input modes. When P76CA-xxx
coaxial adapters are used, the termination voltage can be adjusted over a limited operating range before reaching an overload
condition. A graph of the operating limits of the termination voltage with respect to the input voltage is shown for the P76CA-xxx
coaxial adapters. (See Figure 3 on page 24.)
The P76TA adapter with P7500 probe tips will not reach an overload condition with normal operating voltages, due to the
attenuation of the input signal. It is possible, however, to damage the probe tip by exceeding the maximum allowable voltage
difference between the input voltage, Vin, and the termination voltage, Vterm. Th e maximum allowable voltage difference is defined
asVin–Vterm≤ 5 volts. The probe Overload LED will not light if this limit is exceeded.
CAUTION. To prevent damage to the P7500 Series solder tips, do not exceed a 5 volt difference betwe en the input voltage, Vin,
and the termination voltage, Vterm.
WARNING. To avoid a burn injury, do not handle the P7500 Series solder tips if th e 5 volt limit has been exceeded. Allow
time for the resistors to cool before handling the solder tips.
P7600 Series TriMode Probes User Manual 23
Basic Operation
Figure 3: Termination voltage operating range for P76CA-xxx coaxial adapters
24 P7600 Series TriMode Probes User Manual
Probe Setup Screen
Use the Probe Setup screen to adjust the probe input settings for the measurem ent you are taking. (See Figure 4.) To display the
Probe Setup screen, select Probe Cal from the oscilloscope Vertical menu. The Probe Setup screen has two sections to configure
the inputs; one to select the input mode and adjust the offset voltages, and the other to set the termination voltages. The Input
Mode pull-down selection and status box applies to both the Offset Voltage and to the Termination Voltage control sections.
The following pages describe the controls and status fields in the Probe Setup screen.
Figure 4: Probe Setup screen
Basic Operation
P7600 Series TriMode Probes User Manual 25
Basic Operation
Selecting the TriMode Input Mode
The Input Mode button on the probe toggles the internal probe input selector switches between the four input mode selections.
The input mode can also be selected from the drop-down menu in the Probe Se tup 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 traditional 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 bo th inputs, within the CMRR performance capability of the probe.
A-GND Mode. The A-GND mode is used for making probe A inp ut single-ended measurements with P76CA-xxx co axial
adapters, which connect the ground through the coaxial connector and the cable shield. When the P76TA adapter is used, TriMode
probe tips such as the P75PST solder tip can be soldered directly to the circuit under test. The P75PST probe tip includes a solder
connection for the local circuit ground. In the A-GND Mode the internal probe input switch is configured to measure the A input
relative to this local circuit ground refere nce. The A input signal measurement in 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.
B-GND Mode. The B-GND mode is used for making probe B input single-ended measurements with the P76CA-xxx coaxial
adapters, which connect the ground through the coaxial connector and the cable shield. When the P76TA adapter is used, TriMode
probe tips such as the P75PST solder tip can be soldered directly to the circuit under test. The P75PST probe tip includes a solder
connection for the local circuit ground. In the B-GND Mode the internal probe input switch is configured to measure the B input
relative to this local circuit ground refere nce. The B input signal measurement in B-GND Mode is designed for minimal coupling
from any signal 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 m aking common mode measurements on a differential signal and represents a new
probe feature that previously could 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.
26 P7600 Series TriMode Probes User Manual
Basic Operation
Selecting the Offset Voltage
You can set both the offset and termination voltages to levels that are unique for each input mode. For reference, the TriMode Input
Mode field displays the a ctive input mode in the Offset area of the Probe Setup screen. The input mode can be selected from the
drop-down menu next to the input field, or from the Input Mode button on the probe control box.
Offset voltages may be automatically generated by the probe and can be set automatically by measuring the offset level of the
signals present on the A and B inputs. Pressing either of the two Set buttons in the Offset section of the Probe Setup screen. You
canalsoenterspecific offset values manually using the Offset fields input boxes.
There are four manual Offset Voltage value entry fields which also display the current Offset Voltage settings. 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 offset settings
Differential = (A – B)
Common = (A + B)/2
Adjusting the Differential or Common settings affects the A and B offset settings
A = Common + (Differential/2)
B = Common – (Differential/2)
P7600 Series TriMode Probes User Manual 27
Basic Operation
Offset Voltage Set Buttons
The probe A and B signal inputs are se nsed, monitored, and averaged by probe internal circuitry and the sensed values are
used by the automatic Offset Voltage Set control buttons.
Offsets A, B Individually. ClickthisSet
button to set the A Offset to the average value
of the A signal and the B Offset to the average
value of the B signal.
Offsets A, B to mean. Click this Set button
to set the A and B Offset fields to the mean
value between the average A and B signal
levels.
Offset. Click on the separate Offset fields
to enter a specific value for that mode. For
example, you may want to offset the A input by
an amount that differs from the predetermined
values that the Set buttons provide.
The oscilloscope vertical channel offset control
adjusts the currently selected Offset field.
Set button examples. With a 50% duty cycle signal that varies from 0 to 1 volt on input A, and another 50% duty cycle signal
that varies from 1 to 3 volts on input B, clicking the Offsets A, B Individually button will display the A signal 0.5 volt above and
28 P7600 Series TriMode Probes User Manual
Basic Operation
below the average signal level. The B signal will appear 1 volt above and below the average signal level. The A signal is offset by
+0.5 volt and the B signal is offset by +2 volts.
Using the signal example from above, with a signal that varies from 0 to 1 volt on input A, and another from 1 to 3 volts on input B,
clicking the Offsets A, B to Mean button will offset both signals by 1.25 volts (0.5 V + 2 V/2).
P7600 Series TriMode Probes User Manual 29
Basic Operation
Selecting the Termination Voltage
The probe A and B Termination Voltages are set and stored independently for each of the four input modes. A drop-down menu
selection control for the Inpu t Mode is available in the Offset selection area of the Probe Setup screen. The Input Mode selection
control box also displays t he selected Input Mode to which the display of stored Termination Voltages is associated. Termination
voltages may be automatically generated by the probe and can be selected using the two Set buttons in the Termination Voltage
section of the Probe Setup screen. You can also enter specific values for the A and B inputs directly in the Termination Voltage fields.
Termination Voltage Set Buttons
TermV A, B individually. Click the Set
button to set the A Termination Voltage to
the average value of the A signal and the B
TerminationVoltagetotheaveragevalueof
the B signal.
TermV A, B to mean. Click the Set button
to set the A and B Termination Voltage fields to
the mean value between the average A and B
signal levels.
Termination Voltage. Click on the separate
A or B Termination Voltage fields to enter a
specific value for that input.
30 P7600 Series TriMode Probes User Manual
Basic Operation
Probe Adapter and Tip Information
When the probe is first connected to the oscilloscope channel, the oscilloscope queries the probe for status information, including the
probe type and serial number, and the model number of the adapter that is connected to the probe head. However, solder tips that
are attached to the P76TA adapter must be identified manually. (See page 33, Selecting the Probe Tip.) The oscilloscope retains
the probe solder tip inf ormation for that channel only; if you move the probe to another channel, you must select the solder tip again.
The Probe Tip field and buttons described below are located beneath the Termination Voltage section of the Probe Setup screen.
Probe Tip identifier field. The Probe
Tip field indicates the model number of the
attached adapter, and automatically updates
if the adapter is changed while the probe is
connected to the oscilloscope.
When the P76TA solder tip adapter is first
connected, the P robe Tip field displays “Other”,
regardless of which (or if a) P7500 Series
solder tip is connected to the adapter. You
must select the tip that you are using from the
Probe Tip Selection screen.
P7600 Series TriMode Probes User Manual 31
Basic Operation
Select button. Click on this button to display
the Probe Tip Selection screen. (See page 33,
Selecting the Probe Tip.) Next, click on the tip
that you have connected to the P76TA adapter,
and then click OK.
Controls. Clickonthisbuttontodisplaythe
Probe Controls screen. (See Figure 5.) This
screen displays a subset of the selections that
are available in the Probe Setup screen, and
the shorter display height allows more room for
the waveform display area.
Figure 5: Probe Controls screen
32 P7600 Series TriMode Probes User Manual
Selecting the Probe Tip
Use the Pro be Tip Selection screen shown below to identify and select the solder tip that you are using with the P76TA adapter. To
display the Probe Tip Selection screen, click the Select button in the Probe Setup screen. (See page 25, Probe Setup Screen.) The
P76TA adapter accepts the P7500 Series TriMode solder tips shown in the screen below.
Click on the radio button next to the solder tip
that you are using, and then click OK.
After you click OK, the oscilloscope applies
appropriate DSP (Digital Signal Processing)
signal correction to the measurements that you
take with that probe/probe tip combination on
that channel.
You must match the tip selection on-screen
to the tip that you are using, because the
oscilloscope uses a unique DSP filter for each
solder tip. Inaccurate measurements will result
if the wrong tip is selected.
If you change the solder tip or move the probe
to another channel, you must update the Probe
Tip Selection screen.
Basic Operation
P7600 Series TriMode Probes User Manual 33
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.
Temperature Compensation
The P7600 Series probes employ temperature compensation to optimize measurement accuracy. Whenever a probe setting is
changed, such as Input Mode, Offset Voltage, or vertical scale factor, a temperature compensation update occurs. Continuous
temperature compensation is not done to avoid introducing noise into the probe amplifiers.
When the probe is first powered on from a cold start condition, you must allow the probe an d 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 P7600 Series probes contain S-parameter characterization data for the probe, which is downloaded to the attached
oscilloscope when the probe is first connected. This probe-specific data is used along with nominal probe adapter data to generate
DSP correction filters that are used for improved high frequency measurement accuracy. After the probe adapter is attached to the
probe, the adapter transfers identification data which is used as part of the generated filter process.
34 P7600 Series TriMode Probes User Manual
Basic Operation
The Effect of DUT Source Impedance on Measurement Accurac y
The input impedance of the combined P76TA adapter and P7500 Series solder tip differs from that of the P76CA-xxx coaxial
adapters. When the P76TA adapter is used, this impedance difference affects the probe amplifier gain and must be accounted for
by including the DUT (Device Under Test) source impedance whe n c alculating circuit loading effects. For most measurement
applications, this difference is au tomatically compen sated for by the oscilloscope gain circuitry, and is not a concern to the user.
The following pages briefly describe the two measurement configurations to help you understand these differences when probing
50 ohm transmission line systems.
Coaxial Adapter Measurement Configuration
In the coaxial adapter measurement configuration, each signal of the differential signal pair from the DUT is transmitted to a
matched termination at the probe input. (See Figure 6 on page 36.) The signal gain is calibrated to the probe tip, which results
in measuring one half of the source AC component shown in the figure, due to the matched termination. If there is a DC bias
component of the signal source, it is also attenuated by half due to the matched termination, but you can use the termination
voltage control to null out the DC loading effect of the probe.
P7600 Series TriMode Probes User Manual 35
Basic Operation
Figure 6: Coaxial adapter measurement configuration
Solder Tip Adapter Measurement Configuration
In many of the high-frequency signaling standards that the P7600 Series probes are designed for, a 50 ohm termination at the
transmitter is in parallel with another 50 ohm termination at the end of the transmission line path, effectively making a 25 ohm signal
source impedance. (See Figure 7 on page 37.) In this application, the solder tip adapter measurement configuration is designed to
pick off the transmitted signal at a location in the signal transmission path. However, the P7500 Series solder tip connection loads
the signal and reduces the signal amplitude by about 10%. To correct for this loading loss, the gain of the probe is increased by
about 10% when the P76TA adapter is sensed on the prob e head.
36 P7600 Series TriMode Probes User Manual
Basic Operation
Figure 7: Solder tip adapter measurement configuration and equivalent model
P7600 Series TriMode Probes User Manual 37
Basic Operation
For systems with source impedances not equal to 25 ohms, it may be necessary to adjust the oscilloscope EXT ATTEN scale factor
and the offset voltage to optimize the measurement accuracy. You may also need to adjust the probe termination voltage control to
null out the DC loading effect of the probe. More detail, including input circuit topologies and scale factor calculations, can be foun d
in the P7600 Series TriMode Probes Technical Reference.
CAUTION. To prevent damaging the P7500 Series solder tips, do not exce ed the maximum allowable voltage difference between
the input voltage, Vin, a nd the terminat ion voltage, Vterm. The maximum allowable voltage difference is defined as Vin – V term
≤ 5volts.
38 P7600 Series TriMode Probes User Manual
ConnectingtoaCircuitBoard
TriMode adapters are necessary to complete the connection between the P7600 Series probes and your circuit. The adapters are
available as optional accessories and provide several connection options. You can use coaxial adap ters with SMP or 2.92 mm
connectors, or the P76TA a dapter, which allows you to use P7500 Series solder tips such as the P75PST Performance Solder Tip.
All of the adapters and tips provide the signal and ground connections necessary to take full TriMode measure m ents with one
setup. All of the ad apters secure to the probe head with a 2 mm hex screw. (See page 5, Connect the Adapters.)
Coaxial Adapters
Three coaxial adapters are available for the probe and are described on the following pages. All of the adapters mate to the
P7600 Series probe head through a multi-pin connector that transfers the adapter information to the oscilloscope for automatic
identification. The connector also provides a 50 ohm signal path for each of the probe inputs. The A an d B inputs on the adapters
carry the circuit ground connections through the outer shield on the coaxial cables and connectors.
Precautions when connecting to the circuit. To achieve the best performance and service life of the probe and adapters,
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.
Use two wrenches to tighten t he coaxial connectors; one to prevent the cable from twisting, and another to tighten the cable
connector to the adapter or circuit connection.
When you tighten cable connectors that are close to each other (as on the P76CA-292 adapter), be careful not to strike
adjacent connectors with the wrench.
Basic Operation
To preserve the adapter cables and maintain the highest s ign al fidelity, never kink the wires or put undue stress on them.
Support the adapter/probe h ead by taping it to your circuit or providing a means to prevent strain on the circuit connection.
P7600 Series TriMode Probes User Manual 39
Basic Operation
P76CA-292
Use this adapter with high quality,
skew-matched cables that have male
2.92 mm connectors at the probe end. The
other end of the cables can be customized with
connectors that mate to your circuit.
P76CA-292C
This adapter includes a pair of skew-matched,
6 in (15.2 cm) cables with male 2.92 mm
connectors. Use this adapter to connect to
2.92 mm or SMA connectors in your system.
P76CA-SMP
This adapter includes a pair of skew-matched,
6 in (15.2 cm) cables with female SMP
connectors.
40 P7600 Series TriMode Probes User Manual
P76TA Adapter
1. Align the red cable band to the red A input
and then push the cable into the probe
adapter until you feel a click.
2. The connector is fully seated when it is
flush with the edge of the adapter.
CAUTION. The P76TA adapter has
replaceable contacts inside the probe tip
connector that may stick to the probe tip
when it is disconnected. (See page 64, Bullet
Contacts.)
To prevent damage to the adapter, before
you connect probe tips to the adapter, always
check that the contacts are located in the
adapter only.
Basic Operation
P7600 Series TriMode Probes User Manual 41
Basic Operation
3. To remove the tip, pull the cable tab
CAUTION. Pull only on the cable tab when
removing the tip. You may damage the tip or
adapter if you pull on the cables.
Soldering instructions for the tips are
described later in this section. (See page 45,
Connect the P75PST or P75TLRST Solder
Tip.)
straight out from th e probe adapter.
42 P7600 Series TriMode Probes User Manual
P75PST TriMode Performance
Solder Tip
P75TLRST TriMode Long Reach
Solder Tip
The Performance and Long Reach solder tips
enable you to make full signal characterizations
from a multi-point soldered connection . The
P75PST tip provides up to 30 GHz bandwidth
performance. The P75TLRST tip provides up
to 20 GHz bandwidth.
The soldered connection passes the two
complementary signals (the A signal and the
B signal), and a ground reference from your
circuit to the TriMode probe.
The internal electronic switching control of the
TriMode probe allows any one of the four probe
Input Modes to be selected at a time.
Basic Operation
P7600 Series TriMode Probes User Manual 43
Basic Operation
The dimensions of the solder tip connections
are provided here for reference. You can
design the tip footprint into your circuit board
layout for easier test connections.
To connect the probe tip to your circuit, use thin
wire with a diameter of 0.20mm (8mil) or less.
You can order a kit of the appropriate wire from
Tektronix using the 017-0103-00 part number.
(See page 53, Optional Accessories.)
The solder ramps that are supplied with the
P76TA adapter are recommended as an aid to
keep the probe tip wire connections as short as
possible (<0.032 in./0.8 mm).
You will also need tweezers, a low-wattage
soldering iron, and a pair of sharp wire cutters.
44 P7600 Series TriMode Probes User Manual
Connect the P75PST or P75TLRST
Solder Tip
1. Identify a location where the tip can be
placed, soldered, and secured to your
circuit.
NOTE. You can work with long wires (~1 inch),
but keep the finished wire lengths of the signal
and ground connections a s short as possible.
2. Lay the wires against a circuit board pad,
trace, or other conductive feature. (If vias
or through-holes are very close, you can
thread the wires through them.)
3. Solder the wires to your circuit.
NOTE. For best results, use a flux pen to clean
your connections before soldering.
Basic Operation
P7600 Series TriMode Probes User Manual 45
Basic Operation
4. Align the bottom of the tip to the notch in the
5. Thread the wires through the tip.
6. Press the tip to the circuit board and quickly
7. Clip off the excess wire from all of the
8. Attach the solder tip to the probe adapter.
ramp as shown, and then secure the tip to
therampwithglueortape.(Solderramps
are included with the P76TA a dapter or a
kit of 25 can be ordered separately.) The
notch in the ram p helps you to position the
tip as close as possible (<0.032 in./0.8 mm)
to the circuit connections. Very short leads
are required for ≥25 GHz measurements.
solder the wires to the tip. Keep all finished
wire lengths as short as possible.
solder joints.
(Note the polarity) Push the end of the tip
into the probe adapter until it seats in the
probe adapter.
46 P7600 Series TriMode Probes User Manual
Secure the Tip
9. Push the end of the tip into the probe
adapter until it seats in the probe adapter.
10. For a secure mechanical connection, use
tape or hot glue to secure the tip to your
circuit. (See page 47, Secure the Tip.)
11. Secure the probe to the circuit board with
tape or hook-and-loop strips.
Basic Operation
P7600 Series TriMode Probes User Manual 47
Basic Operation
Notes on Using the Tips.
Use the following precautions when you solder the tips:
CAUTION. To prevent damage to the circuit board or circuit board connections due to accidental movement of the probe and
soldered leads, we recommend that you secure the tip to the circuit board using an adhesive or tape. You can also use ot her
materials such as Kapton tape or hot glue.
To avoid damage to the tip or the circuit under test, avoid applying excessive heat from the soldering iron. Use a low wattage,
temperature-controlled soldering iron and appropriately sized soldering iron tip.
Use a low-wattage, temperature-controlled soldering iron and a small mass soldering iron tip. The soldering iron temperature
should be set as low as possible, while still providing a reliable s older joint.
Use SAC305 solder to attach the tip wires to the circuit under test.
When the differential at tachmen t wires need bending, they should be bent symmetrically to maintain equal spacing between
them. Use care when you solder a tip to a circuit under test to avoid inadvertently desoldering the attachment wires.
For optimum performance and signal integrity, use the solder tip ramps to help you to keep the lead length between the DUT
(Device Under Test) and the tip as short as possible, and the lead lengths the same length.
48 P7600 Series TriMode Probes 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 P7600 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
024-3610-xx Pouch, nylon carrying case with inserts. This carrying case
has several com partments to hold the probe and accessories.
006-3415-xx Antistatic wrist strap. When you use the probe, always w ork
at an antistatic work station and wear the antistatic w rist strap.
P7600 Series TriMode Probes User Manual 49
Accessories and Options
Standard accessory
Reorder part number
and quantity Description
—
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.
071-3026-xx User manual. The user manual provides instructions
for operating the P7600 Series TriMode Probes. Other
documentation including basic probe and measurement
literature, and the probe manuals (the user m anual and
a probe-specific technical reference) can be found on
www.Tektronix.com.
50 P7600 Series TriMode Probes User Manual
Standard accessory
Reorder part number
and quantity Description
067-3259-xx
DC probe calibration fixture. Use this fixture to perform a
functional check and a DC calibration with the host instrument.
Accessories and Options
012-0208-xx
50 Ω BNC-M to BNC-M cable assem bly, 10 in.
To perform a probe calibration, use this cable to connect the
DC Calibration fixture to the DC Probe Cal output connector
on the host instrument.
276-1152-xx
ESD protective cap. The probe is shipped with a protective
cap on the probe b ody connectors. The cap prevents dirt,
moisture, an d electrostatic discharge from damaging the probe
and connectors. K eep the protective cap on the probe when it
is not in use.
Two extra ESD protective caps are included with the probe.
P7600 Series TriMode Probes User Manual 51
Accessories and Options
Standard accessory
Reorder part number
and quantity Description
129-2781-xx Hex wrench. Use this 2 mm hex wrench to secure the TriMode
adapters to the probe body.
016-0633-xx
(Package of five colored
pairs)
Color band kit. This kit includes two sets of five colored pairs.
When you are using more than one probe, the bands enable
you to visually match the probes to the channels that they are
connected to.
To use the marker bands, attach one band to the indent on
the molded strain relief on the probe cable. Use the matching
color band on the other end of the probe, at the control box.
52 P7600 Series TriMode Probes User Manual
Optional Accessories
Optional accessory Part number Description
174-5771-xx
P76CA-292 P76CA-292 Adapter.
P76CA-292C P76CA-292C Adapter.
Phase-matched Dual SMA Cables (38 in.)
Extend the reach of the P76CA adapters with this high
bandwidth, low skew cable pair.
Use this adapter with high quality, skew-matched cables that
have male 2.92 mm connectors at the probe end. The other
end of the cables can have custom connections to your circuit.
This adapter includes a pair of skew-matched, 6 in (15.2 cm)
cables with male 2.92 mm connectors.
Accessories and Options
P7600 Series TriMode Probes User Manual 53
Accessories and Options
Optional accessory Part number Description
P76CA-SMP P76CA-SMP Adapter.
This adapter includes a pair of skew-matched, 6 in (15.2 cm)
cables with female SMP connectors.
P76TA P76TA Ad apter.
Use this adapter with the P7500 Series probe solder tips
shown below.
P75PST P7500 TriMode Performance Solder Tip.
This tip provides a soldered, multi-point connection that
supports full TriMode measure ment capabilities at up to
30 GHz bandwidth.
54 P7600 Series TriMode Probes User Manual
Optional accessory Part number Description
P75TLRST P7500 TriMode Long Reach Solder Tip.
This tip provides a soldered, multi-point connection that
supports full TriMode measurement capabilities up to 20 GHz
bandwidth.
Accessories and Options
020-2936-xx
TriMode Resistor Solder Tip.
This tip provides solder connection points at 100 Ω resistors
that extend about 0.2 in (5 mm) from the solder tip board. The
resistors can withstand more solder cycles than the P75PST
and P75TLRST solder tips, and can be replaced if th ey break.
A kit of replacement resistors is available; see below.
P7600 Series TriMode Probes User Manual 55
Accessories and Options
Optional accessory Part number Description
020-2944-xx
TriMode Extended Resisto r Solde r Tip.
This tip provides solder connection points at 100 Ω resistors
that extend about 0.6 in (15 mm) from the solder tip board . The
resistors can withstand more solder cycles than the P75PST
and P75TLRST solder tips, and can be replaced if they break.
A kit of replacement resistors is available; see below.
006-8237-xx
(Strip of 10)
020-3118-xx
(package of 25)
Adhesive tip tape. Use th e double-sided adhesive tip tape to
secure the solder tip assembly to your circuit board.
Solder tip ramp k it.
These ramps help you to position the solder tips on your
circuit. Glue or tape a ramp to the bottom of the solder tip so
that the tip connections are as close as possible to your circuit
connections (<0.032 in./0.8 mm for ≥25 GHz measurements).
The ramps work with all of the TriMode solder tips.
56 P7600 Series TriMode Probes User Manual
Optional accessory Part number Description
017-0103-xx Wire replacement kit. Use this kit to add wire leads on the
solder tips.
Accessories and Options
020-2937-xx
Replacement resistor kit for TriMode resistor solder tips.
This kit includes:
100 Ω leaded resistors, quantity 50
75 Ω surface-mount, 0402 resistors, quantity 50
Nonconductive tubing, quantity 50
020-3105-xx
(Package of 4)
Replacement SMPM bullet contacts (P7600 Series probe
head). To maintain t he best signal integrity, replace the bullets
in the probe head after 200 insertion cycles.
P7600 Series TriMode Probes User Manual 57
Accessories and Options
Optional accessory Part number Description
003-1934-xx
SMPM bullet removal tool (P7600 Series head). This tool
allows you to safely remove and install the bullet contacts from
the probe head.
013-0359-xx
(Package of 4)
Replacement G3PO bullet contacts (P76TA adapter). To
maintain the best signal integrity, replace the bullets in the
probe adapter after 200 insertion cycles.
58 P7600 Series TriMode Probes User Manual
Optional accessory Part number Description
003-1896-xx
G3PO bullet removal tool (P76TA adapter). This tool allows
you to safely rem ove and install the bullet contacts in the
adapter.
Accessories and Options
067-2431-xx
Deskew fixture. Use this fixture to time-align the probe to
other probes connected to your measurement system. The
fixture is powered by a USB port on the oscilloscope. A USB
A–B cable and an SMA cable are included with the fixture.
P7600 Series TriMode Probes User Manual 59
Accessories and Options
Options
Option C3. Calibration Service 3 years
Option C5. Calibration Service 5 years
Option D3. Calibration Data Report, 3 years (with Option C3)
Option D5. Calibration Data Report, 5 years (with Option C5)
Option G3. Gold Plan 3 years
Option G5. Gold Plan 5 years
Option R3. Repair Service 3 years
Option R5. Repair Service 5 years
-R3DW. Repair service coverage: 3 years (includes product warranty period), 3 year period starts at time of purchase.
-R5DW. Repair service coverage: 5 years (includes product warranty period), 5 year period starts at time of purchase.
60 P7600 Series TriMode Probes User Manual
Maintenance
This section contains maintenance and support inform ation for your probe.
Host Instrument Firmware
Some instruments may require a firmware upgrade to support full functionality of the P7600 Series probes. Instruments with
lower versions of firmware may not display all probe controls and indicators on screen, and in some cases may require you to
power-cycle the instrument to restore normal instrument operation.
The following table lists the re quired versions of instrument firmware for some of the instruments that currently support the
P7600 Series probes.
Instrument Firmware Version
MSO/DPO73304DX oscilloscope
MSO/DPO72504DX oscilloscope
DPO/DSA73304D oscilloscope
DPO/DSA72504D oscilloscope
To check the firmware version on your instrument, from the menu bar, click Help/About TekScope. If you need to upgrade your
instrument firmware, go to www.tektronix.com/software to download the latest firmware.
Maintenance
V 6.8 or higher
V 6.8 or higher
V 6.8 or higher
V 6.8 or higher
P7600 Series TriMode Probes User Manual 61
Maintenance
Error Conditions
LED Indicators
If one of the Input Mode LEDs does not remain lit 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, the probe must be returned to Tektronix for repair.
Signal Display
If the probe is connected to an active signal source and you do not see the signal displayed on the oscilloscope:
Check the probe adapter connection at the probe body. (See page 4, Connect TriMode Adapters to the Probe Body.)
Check the probe tip or probe cable connection on your circuit. (See page 39, Connecting to a Circuit Board.)
Perform a functional check using the FAST EDGE output of the oscilloscope. (See page 11, Functional Check.)
Check that the bullet contacts are present and intact in the probe body (and in the P76TA adapter, if using). (See page 66,
Inspecting the Bullets and Connectors.)
62 P7600 Series TriMode Probes User Manual
Measurement Errors
If you suspect that your measurement may not be accurate, and you are using the P76TA adapter:
Check that the solder tip signal and ground connections are correct and intact.
Check that the solder tip that you are using on the adapter is what is selected in the P robe Tip Selection screen. (See
page 33, Selecting the Probe Tip.)
Maintenance
P7600 Series TriMode Probes User Manual 63
Maintenance
User-Replaceable Parts
This section describes the components that are replacea ble in the P7600 Series probe head and the P76TA adapter.
Bullet Contacts
The input sockets in the P7600 Series probe
head and in the P76TA adapter are protected
by replaceable bullet contacts.
The bullet contacts protect the input sockets
by absorbing the wear from repeated
connect/disconnect cycles of the accessory
adapters and solder tips.
Two sizes are used; the bullet contacts in
the probe head are larger than those for
the adapter, but all of the inspection and
replacement procedures are identical.
A larger tool is used to replace the bu llet
contacts in the probe head. The bullet tools
and bullet conta cts are optional accessories for
the probe.
CAUTION. To prevent wear to the probe head and adapter, use only the correct bullet tool to remove and install the bullets.
64 P7600 Series TriMode Probes User Manual
Removing the Bullets
Follow these steps to remove the bullets by
using the removal tool:
1. Squeeze the tool plunger to extend the
holder tangs.
2. Insert the tool into the probe head or
adapter so that the holder tangs surround
one of the bullets.
3. Release the plunger to secure the holder
tangs on the bullet.
4. Gently pull the tool outward to remove the
bullet.
5. Repeat for the other bu llet.
NOTE. Discard the used bullets to prevent
accidental reuse.
Maintenance
P7600 Series TriMode Probes User Manual 65
Maintenance
Inspecting the Bullets and
Connectors
Use a microscope to closely examine the
bullets and connectors. Use the illustrations
to determine if the contacts appear worn or
broken, and always replace them in pairs.
1. Good
2. Chipped or bent ground contacts (outer
3. Chipped or bent signal contacts (inner
4. Inner contacts misaligned to outer
conductor)
conductor)
conductor
66 P7600 Series TriMode Probes User Manual
Installing the Bullets
1. Squeeze the tool plunger to extend the
holder tangs.
2. Insert a new bullet into the tool so that the
holder tangs surround the bullet.
3. Release the plunger to secure the holder
tangs on the bullet.
4. Insert the tool into the probe head or
adapter and seat the bullet in the recess.
5. Squeeze the tool plunger to release the
bullet.
6. Gently pull the tool out of the probe adapter.
7. Repeat for the other bu llet.
8. Connect an d remove the probe ad apter
on the probe head, or a solder tip on the
P76TA probe adapter, depending on which
bullets you replaced.
9. Verify that the bullets remain in the recess
in which you installed them.
Maintenance
P7600 Series TriMode Probes User Manual 67
Maintenance
Handling the Probe
The P7600 Series probes are precision high-frequency devices; 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 control 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 damage 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 co m ponen ts 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 adverse weather conditions
Kinkorfoldtheprobecabletighterthana2inchradius
Solder the tips with excessive heat or duration
68 P7600 Series TriMode Probes User Manual
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 a gents; they may damage the p robe. 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 then rinse with a cloth or swab dampen ed 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.
Maintenance
P7600 Series TriMode Probes User Manual 69
Maintenance
Returning the Probe for Servicing
If your probe requires servicing, you m ust 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 probe into a n 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.
70 P7600 Series TriMode Probes User Manual
Index
Index
A
Accessories
optional, 53
standard, 49
B
Bullet contacts, 64
inspecting, 66
installing, 67
removing, 65
Buttons
offset voltage, 28
termination voltage, 30
C
Calibration
checking the instrument
status, 16
probe, 15
running on the instrument, 19
TriMode, 15
Cleaning the probe, 69
Coaxial adapters, 39
Connecting
adapters to the probe body, 4
Connecting to a circuit board, 39
Connecting to circuit with
coaxial adapters, 39
solder tips, 42
Controls and indicators
Input Mode button and LEDs, 8
TriMode, 10
D
Documentation, vi
DSP correction, 34
E
Error conditions
signal display, 62
TriMode LEDs, 62
F
Firmware, 61
Functional check, 11
H
Handling the probe, 68
Host instrument firmware, 61
I
Input Mode, 8
Input Mode selection, 26
Input tips, 43, 4 4
Installation
connecting adapters, 4
M
Maintenance, 61
Measurement accuracy
effect of source impedance, 35
improving, 34
with coaxial adapters, 35
with solder tip adapter, 36
O
Offset selection, 27
Offset voltage set buttons, 28
P7600 Series TriMode Probes User Manual 71
Index
Operating considerations, 2
Optional accessories, 53
Options, 60
Overload LED, 9
P
P76CA-292 Adapter, 39
P76CA-292C Adapter, 39
P76CA-SMP Adapter, 39
P76TA Adapter, 41
Probe
calibrating, 18
cleaning, 69
handling, 68
Probe controls
Input Mode button and LEDs, 8,
10
TriMode measure ments, 10
Probe Controls screen, 32
Probe Setup screen, 25
input mode selection, 26
offset selection, 27
offset voltage set buttons, 28
probe adapter and tip
information, 31
termination v oltage set
buttons, 30
Probe tip selection, 33
R
Related documentation, vi
Replaceable parts
bullet contacts, 64
Returning the probe, 70
S
Safety Summary, iii
Solder tip
connecting, 45
resistors, 57
Standard accessories, 49
T
Temperature compensation, 34
Termination voltage selection, 30
Termination voltage set buttons, 30
TriMode Solder Tip
Extended Resistor, 56
Resistor, 55
72 P7600 Series TriMode Probes User Manual
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