xx
TDP3500 and TDP4000
3.5 GHz and 4 GHz Differential Probes
ZZZ
Technical Reference
www.tek.com
071-2297-02
Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are
protected by na
tional copyright laws and international treaty provisions.
Tektronix pro
previously published material. Specifications and price c hange privileges reserved.
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
ducts are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all
Contacting Tektronix
Tektronix, Inc.
14150 SW Karl Braun Drive
P.O. Box 500
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 defective 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 packaging 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 located. Customer shall
be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate m aintenance 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 service 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. TEKTRONIX 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 E XCLU S IVE 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
Important safety information .......................................................................................................... iii
General safe
Service safety summary ......................................................................................................... iv
Terms in this manual .. ... ... . ... . .. . .. . .. . .. . . . .. . .. . .. . .. . . . .. . .. . .. . .. . . . .. . .. . .. . .. . .. .. . .. . .. . .. . .. . . . .. . .. . .. . .. . . . .. . .. . .. . v
Symbols and
Preface................................................................................................................................. vi
Specifications .......................................................................................................................... 1
Warranted
Typical characteristics............................................................................................................ 2
Nominal characteristics ..........................................................................................................5
Probe tip a
Performance verification.............................................................................................................. 10
Required equipment .. . . . . . . .. . .. . .. . .. . .. .. . .. . .. . .. . .. . .. . .. .. . .. . .. . .. . .. . . . .. . .. . .. . .. . .. .. . .. . .. . .. . .. . .. . .. .. . .. . .. . .. . .. . 10
Special a
Preparation . . . . .. . .. . .. . . . .. . .. . .. . .. .. . .. . .. . .. . . . .. . .. . .. . . . .. . .. . .. . .. .. . .. . .. . .. . . . .. . .. . .. . . . .. . .. . .. . .. .. . .. . .. . .. . . . .. . ... 13
DC Attenuation Accuracy . .. . .. . .. . . . .. . .. . .. . . . .. . .. . .. . . . .. . .. . . . . . . .. . .. . .. .. . .. . .. . .. .. . .. . .. . . . .. . .. . .. .. . .. . .. . .. .. . .. . .. . 14
Differe
Rise Time........................................................................................................................17
Maintenance.......................................................................................................................... 22
Inspec
Replacementparts.............................................................................................................. 22
Preparation for shipment. . .. . .. . .. . . . .. . .. . .. . .. . . . .. . .. . .. . .. . .. .. . .. . .. . .. . . . .. . .. . .. . .. . . . .. . .. . .. . .. . .. .. . .. . .. . .. . . . .. . .. . . 2 2
ty summary......................................................................................................... iii
terms on the product. .. . .. . .. . .. . .. . .. . .. . . . .. . .. . .. . .. . .. . . . . . . .. . .. . .. . .. . .. .. . .. . .. . .. . .. . .. . .. .. . .. . .. . .. . .. . . v
characteristics........................................................................................................ 1
dapter specifications ................................................................................................. 6
dapters . .. . .. . . . . . . .. . .. . .. .. . .. . .. . .. .. . .. . .. . . . . . . .. . .. . .. .. . .. . .. . .. . . . .. . .. . .. . . . .. . .. . .. . . . .. . .. . .. . .. .. . .. . .. . . . . 11
ntial Signal Range . . . . .. . .. . .. . .. . . . . . . .. . .. . .. . .. . . . .. . .. . .. . .. . .. . . . .. . .. . .. . .. . . . . . . .. . .. . .. . .. .. . .. . .. . .. . .. . .. . . . .. . 16
tion and cleaning. .. . .. . . . .. . .. . .. . .. . . . . . . .. . .. . .. . .. . .. .. . .. . .. . .. . .. . .. . . . .. . .. . .. . .. . . . . . . .. . .. . .. . .. . .. .. . .. . .. . .. . .. 22
Table of Content
s
TDP3500 and TDP4000 Technical Reference i
Table of Content
s
ii TDP3500 and TDP4000 Technical Reference
Important safet
y information
Important saf
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.
To safely perform service on this product, additional information is provided at the end of this section. (See page iv,
Service safety summary.)
ety information
General safety summary
Use the product only as 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 shall be used in accordance with local and national codes.
For correct and safe operation of the product, it is essential that you follow generall
to the safety precautions specified in this manual.
The product is designed to be used by trained personnel only.
Only qualified personnel who are aware of the hazards involved should remove the cover for repair, maintenance, or
adjustment.
Before use, alway
This product is not intended for detection of hazardous voltages.
s check the product with a known source to be sure it is operating correctly.
y accepted safety procedures in addition
Use personal protective equipment to prevent shock and arc blast injury where hazardous live conductors are exposed.
While using this product, you may need to access other parts of a larger system. Read the safety sections of the other
component manuals for warnings and cautions related to operating the system.
When incorporating this equipment into a system, the safety of that system is the responsibility of the assembler of the system.
To avoid fire or personal injury
ngs.
Observe all terminal rati
the product manual for further ratings information before making connections to the product. Do not exceed the Measurement
Category (CAT) rating and voltage or current rating of the lowest rated individual component of a product, probe, or accessory
if applicable. Use cautio
Do not apply a potential to any terminal, including the common terminal, that exceeds the maximum rating of that terminal.
The measuring terminals on this product are not rated for connection to mains or Category II, III, or IV circuits.
n when using 1:1 test leads because the probe tip voltage is directly transmitted to the product.
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 with suspected failures. If you suspect that there is damage to this product, have it inspected by
qualified service personnel.
Disable the product if it is damaged. Do not use the product if it is damaged or operates incorrectly. If in doubt about safety of
the product, turn it off and disconnect the power cord. Clearly mark the product to prevent its further operation.
To avoid fire or shock hazard, observe all ratings and markings on the product. Consult
TDP3500 and TDP4000 Technical Reference iii
Important safet
Before use, inspect voltage probes, test leads, and accessories for mechanical damage and replace when damaged. Do not
use probes or te
y information
st leads if they are damaged, if there is exposed metal, or if a wear indicator shows.
Examine the ex
Use only speci
terior of the product before you use it. Look for cracks or missing pieces.
fied replacement parts.
Do not operate in wet/damp conditions. Be aware that condensation may occur if a unit is moved from a cold to a
warm environment.
Do not operate in an explosive atmosphere.
Keep produc
t surfaces clean and dry.
Probes and test leads
Remove all probes, test leads and accessories that are not in use.
Use only correct Measurement Category (CAT), voltage, temperature, altitude, and amperage rated probes, test leads, and
adapters (if applicable) for any measurement.
Inspect
defects in the probe body, accessories, or cable jacket). Do not use if damaged.
the probe and accessories.
Servicesafetysummary
The Service safety summary section contains additional information required to safely perform service on the product. Only
qualified personnel should perform service procedures. Read this Service safety summary and the General safety summary
before performing any service procedures.
Remove the input signals before you clean the product.
Before each use, inspect probe and accessories for damage (cuts, tears, or
To avoid electric shock. Do not touch exposed connections.
Do not service alone. Do not perform internal service or adjustments of this product unless another person capable of
rendering first a id and resuscitation is present.
iv TDP3500 and TDP4000 Technical Reference
Terms in this manual
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 this product or other property.
Symbols and terms on the product
These terms may appear on the product:
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) m ay appear on the product:
Important safet
y information
TDP3500 and TDP4000 Technical Reference v
Preface
Preface
This is the Technical Reference Manual for the TDP3500 and TDP4000 differential probes. This manual provides
specifications and performance verification procedures for the probe.
vi TDP3500 and TDP4000 Technical Reference
Specifications
Specification
s
The specifications in Tables 1 through 4 apply to a TDP3500 and TDP4000 differential probes installed on a Tektronix
oscilloscope. The probe must have a warm-up period of at least 20 minutes and be in an environment that does not exceed
the limits described. (See Table 2.) The probe calibration and Autozero routines should be run on the host instrument before
verifying the warranted probe specifications. Specifications for the TDP3500 and TDP4000 differential probes fall into three
categories: warranted, typical, and nominal characteristics.
Warranted characteristics
Warranted characteristics describe guaranteed performance within tolerance limits or certain type-tested requirements.
(See Table 2
Performance verification procedures are contained in the TDP3500 and TDP4000 Technical Reference, which is Tektronix
part number 071-2297-XX.
Table 1: Warranted electrical characteristics
Specification TDP3500 TDP4000
Common-mode signal range (DC
coupled)
Maximum nondestructive input voltage
between signal and common of the same
channel
.) Warranted characteristics that have Performance Verification checks are marked with the
Differential signal range (DC coupled)
±2.0 V
(DC + peak AC)
+5Vto–4V
±15 V
(DC + peak AC)
(DC + peak AC)
±2.0 V
(DC + peak AC)
+5 V to –4 V
±15 V
(DC + peak AC)
symbol.
(DC + peak AC)
DC attenuation accuracy
Rise time, probe only
±2% of input ±2% of input
≤140 ps
(10–90%, + 20 °C to + 30 °C)
Temperature
Humidity
Operating: 0 to +40 °C (32 °F to +104 °F)
Nonoperating: –40 to +71 °C (–40 °F to +159 °F)
1
Operating: 5% - 90% RH, tested at + 30 to +40 °C (+86 °F to +104 °F)
Nonoperating: 5% - 90% RH, tested at +30 to +60 °C (+86 °F to +140 °F)
1
arning that follows.
See w
WARNING. To avoid a burn hazard at high ambient temperatures, do not touch the probe with bare hands at nonoperating
temperatures above +50 °C.
TDP3500 and TDP4000 Technical Reference 1
Specifications
Typical characteristics
Typical characteristics describe typical but not guaranteed performance.
Table 2: Typical electrical characteristics
Specification TDP3500 TDP4000
Bandwidth (probe only) DC to ≥3.5 GHz DC to ≥4GHz
Rise time, probe only
(10–90%, + 20 °C to + 30 °C)
Differential input resistance, DC coupled 100 kΩ 100 kΩ
Common mode input resistance 50 kΩ 50 kΩ
Differential input capacitance
Common-mode input capacitance
Offset accuracy
Differential offset range
Common mode rejection ratio (See Figure 4 on page 4.)
System noise
Referred to probe input
Input impedance
Propagation delay
<0.3 pF at 10 MHz <0.3 pF at 10 MHz
<0.45 pF per side at 100 MHz <0.45 pF per side at 100 MHz
±10 mV ±10 mV
±1 V ±1 V
<35 nV√Hz @ 100 MHz <35 nV√Hz @ 100 MHz
(See Figure 5 on page 4.)
5.4 ns ±2 ns from probe tip to output 5.4 ns ±2 ns from probe tip to output
≤115 ps
Figure 1: TDP3500 typical bandwidth
2 TDP3500 and TDP4000 Technical Reference
Figure 2: TDP4000 typical bandwidth
Specifications
Figure 3: TDP3500 Typical rise time
TDP3500 and TDP4000 Technical Reference 3
Specifications
Figure 4: TDP3500 and TDP4000 Typical Common-Mode Rejection Ratio
Figure 5: TDP3500 and TDP4000 Typical input impedance versus frequency
4 TDP3500 and TDP4000 Technical Reference
Table 3: Typical mechanical characteristics
Specifications
Dimensions, input connection
Dimensions, c
Dimensions,
Dimensions,
Unit weight (probe only) 144.5 g ( 5.1 oz)
Figure 6
ontrol box
probe head
output cable
: Probe dimensions
0.63 mm (0.025 i
(0.100 in) centers
117mm×41mm×29mm(4.6in×1.6in×1.15in)
86 mm × 11 mm × 8.9 mm (3.4 in × 0.45 in × 0.35 in)
1.22 m (48 in)
n) square pin sockets on 2.54 mm
Nominal characteristics
l characteristics describe guaranteed traits, but the traits do not have tolerance limits.
Nomina
Table 4: Nominal electrical characteristics
configuration
Input
ut coupling
Outp
Voltage range
Termi n a tion
rential (two inputs, + and - ), with case ground
Diffe
upling
DC co
V
+/–2
minate output into 50 Ω
Ter
TDP3500 and TDP4000 Technical Reference 5
Specifications
Probe tip adapter specifications
This section describes the characteristics of the adapters that are included in your accessory kit. The adapters are listed
in order of performance, beginning with the fastest. You will get the best probe performance by connecting the probe
directly to square pins on your circuit. However, as test points are not always as convenient, these adapters make taking
measurements easier while maintaining the best signal fidelity.
NOTE. All adapter specifications are typical unless otherwise indicated.
Variable Spacing Adapter
Tektronix part number: 016-1885-xx
Bandwidth: <3.5 GHz (TDP3500), <4 GHz (TDP4000),
10/90 Rise time: <120 ps (TDP 3500), <110 ps (TDP4000)
This adapter has adjustable pins that can span from 0.020 to 0.180 inch apart.
6 TDP3500 and TDP4000 Technical Reference
Specifications
Square Pin Adapter
Tektronix part number: 016-1884-xx
Bandwidth: <3.5 GHz
10/90 Rise time: <120 ps
Use this adapter to provide easy access to square-pin test points that you frequently check, or to other probe accessories.
TDP3500 and TDP4000 Technical Reference 7
Specifications
Solder-in Adapter Kit
Tektronix part number: 020-2505-xx Solder-In Adapter Kit
(Includes two adapters, Tektronix part number 016-1926-xx, and a Resistor/Wire Kit, Tektronix part number 020-2506-xx)
You can reorder the kit. The Resistor/Wire Kit includes ten each r esistors (10 Ω and 20 Ω bonded to 0.020 in wire), and
ten lengths of 0.020 in solder wire. The kit also includes ten each resistors (10 Ω and 20 Ω bonded to 0.008 in wire), and
ten lengths of 0.008 in solder wire.
Bandwidth: <4.3 GHz (Solder wire), <3.8 GHz (10 Ω resistor), <3.7 GHz (20 Ω resistor)
10/90 Rise time: <124 ps (Solder wire), <131 ps (10 Ω resistor), <140 ps (20 Ω resistor)
Use this adapter on test points that you frequently check that do not have square pins or other convenient connections.
Solder the wire or resistor leads that come with the kit to your test points.
CAUTION. To prevent short circuits, solder and dress the adapter leads carefully, and make sure that the leads do not touch
other conductors when the adapter is not connected to the probe.
To prevent damaging this adapter, do not connect it to 0.025” square pins. Instead, use the square-pin adapter included
in the probe accessory kit.
8 TDP3500 and TDP4000 Technical Reference
Specifications
Y-Lead Adapter
Tektronix part number: 196-3434-xx
Usable Bandwidth: <100 MHz
Calculated rise time: 1.4 ns
Use this adapter for DC and low-frequency measurements. The socket ends plug onto square pins, component leads, and
the MicroCKT Test Tip adapters included with the probe.
MicroCKT Test Tips
nix part number: 206-0569-xx
Tektr o
Bandwidth: <100 MHz
Usable
ated rise time: 3.5 ns
Calcul
e MicroCKT Test Tips with the Y-lead adapters. Due to the length of these adapters, they are recommended only for
Use th
DC and low-frequency measurements.
TDP3500 and TDP4000 Technical Reference 9
Performance ver
ification
Performance v
Use the following procedures to verify the warranted specifications of the TDP3500 and TDP4000 Differential Probe. Before
beginning these procedures, photocopy the test record and use it to record the performance test results. (See Table 6 on
page 21.) The recommended calibration interval is one year.
These procedures test the following specifications:
DC attenuation accuracy
Differential signal range
Rise time
erification
Required equipment
Table 5 lis
connectors may vary depending on the specific equipment you use.
Table 5: T
Descript
Digitizing oscilloscope withTekVPI
interfac
Sampling oscilloscope Tektronix TDS8000 series oscilloscope
Sampling module
Sampling module
TekVPI caIibration fixture Optional probe accessory
Probe calibration fixture Optional probe accessory
BNC-to-probe tip adapter Optional probe accessory
BNC Male-to-SMA Female adapter
Calibrated DC voltage source Adjustable from 0 V to ≥10 V. Outputs
DMM (2 required) DC Accuracy ≥ 0.5% on range to
NC cables (2)
B
MA cables (2)
S
Banana-to-banana patch cords (2)
Dual-male-banana-to-female BNC
adapter
Precision inline BNC terminator 50 Ω ±0.1%
Y-lead adapter
MicroCKT test tips (2) Standard accessory included w/probe
ts the equipment required to perform the performance verification procedures. The types and quantities of
est equipment
ion
e
Minimum r
Fully com
TDR out
rise time
As pe
must be isolated from earth ground.
asure 10 V, averaging mode.
me
0 Ω,42inch
5
0 Ω,28inch
5
1red
1black
As per description Tektronix part number 103-0090-xx
Standard accessory included w/probe
equirements
patible with TekVPI interface
put; 250 mV step, <100 ps
r description
Example p
Tektroni
(w/V3.02 or higher firmware)
Tekt r o
Tekt r o
Tekt r
Tekt r
Tekt
Tekt
Kei
Fluke 187
Tektronix part number 012-0057-xx
Tektronix part number 012-0649-xx
Tektronix part number 012-0031-xx
Tektronix part number 012-0039-xx
Tektronix part number 011-0129-xx
Tektronix part number 196-3434-xx
Tektronix part number 206-0569-xx
roduct
x DPO7000 series oscilloscope
nix 80E0x
nix 80E04
onix part number 067-1701-xx
onix part number 067-0419-xx
ronix part number 067-1734-xx
ronix part number 015-0572-xx
thley 2400
10 TDP3500 and TDP4000 Technical Reference
Special adapters
Some of the adapters used in these procedures are available only from Tektronix. These adapters are described on
the following pages.
TekVPI Calibration Fixture
Performance ver
ification
The TekVPI c
under test. (See Figure 7.) An SMA connector on the rear of the fixture provides access to the probe output signal
for performance verification measurements.
1. SMA connector for probe output measurements
2. TekVP I socket for probe under test
3. BNC connection used for some tests
alibration fixture, Tektronix part number 067-1701-xx, connects between the host instrument and the probe
Figure 7: TekVPI calibration fixture
TDP3500 and TDP4000 Technical Reference 11
Performance ver
Probe Calibration Fixture
The Probe calibration fixture, Tektronix part number 067-0419-xx, provides a means to check the rise time specification of the
probe. (See Figure 8.) A probe positioner can be helpful to keep the probe in contact with the fixture.
1. SMA connectors for input/output signals and terminations
2. Common Mode (CM) test points
3. Differential Mode (DM) test points
ification
Figure 8: Probe calibration fixture connections
12 TDP3500 and TDP4000 Technical Reference
Preparation
Prepare the equipment as follows:
1. Turn on the TekVPI oscilloscope.
2. Connect the TekVPI Calibration Fixture to the o scilloscope.
3. Connect the SMA M-to-BNC F adapter to the SMA output of the TekVPI Calibration Fixture.
4. Connect the precision termination to the BNC end of the SMA M-to-BNC F adapter.
5. Connect one end of the BNC cable to the precision termination.
6. Connect the other end of the BNC cable to the BNC-to-dual banana adapter.
7. Connect the BNC-to-dual banana adapter to the DMM input.
8. Connect the probe to the TekVPI Calibration Fixture.
9. Connect the Square Pin adapter and Y-lead adapter to the probe. Observe proper polarity: red to (+), black to (–).
10. Connect the MicroCKT test tips to the Y-lead adapter.
11. Set the vertical offset to 0 V. (Check that the offset is set to zero before performing each test unless instructed otherwise.)
Performance ver
ification
re 9: Preliminary test setup
Figu
12. Turn on the remaining test equipment listed in the table.
13. Allow the probe and test equipment to warm up for 20 minutes at an ambient temperature of 20 °C to 30 °C.
14. Photocopy the test record and use it to r ecord the test results. (See Table 6 on page 21.)
Perform the veri fication procedures in order.
TDP3500 and TDP4000 Technical Reference 13
Performance ver
ification
DC Attenuation Accuracy
This test checks the probe gain by m easuring known voltages with a multimeter. The probe is then used to measure the
same voltages, and then a comparison calculation is made.
Preparation
1. Set the vert
2. Connect the
3. Connect a se
Figure 10: Setup for differential-mode tests
ical offset to 0 V.
MicroCKT test tips to the DC source. Observe proper polarity: red to (+), black to (–).
cond DMM to the DC source.
14 TDP3500 and TDP4000 Technical Reference
Verification
4. Set the input voltage on the DC source to approximately 1.4 V. Record the actual voltage as Vin1.
Performance ver
ification
5. Record the output voltage as V
1.
out
6. Reverse the polarity of the input voltage on the DC source. (Swap the MicroCKT test tips or the Y-lead adapter.)
Record the actual voltage as V
7. Record the output voltage as V
2.
in
2.
out
8. Calculate the attenuation using the values from the measurements as follows:
Attenuation = (V
1-Vin2) ÷ (V
in
out
1-V
2)
out
Example:
= [1.4 V – (–1.4 V)] ÷ [0.28 V – (–0.28 V)]
= 2.8 V ÷ 0.56 V
=5.0
9. Verify that the attenuation is in the range of 4.9 to 5.1. Record the results in the test record.
Leave the probe connected for the next test.
TDP3500 and TDP4000 Technical Reference 15
Performance ver
ification
Differential Signal Range
This procedure verifies the differential signal range of the probe. This procedure uses the setup from the previous test.
Verification
1. Set the vertical offset to 0 V.
2. Set the input voltage on the DC source to 0 V, and verify that it is 0 V with the multimeter. (See Figure 11.)
3. Measure the probe output voltage as V
. You will use this offset voltage to get more accurate results in the calculations
offset
below.
Figure 11: Differential signal range test
4. Set the input voltage on the DC source to 2 V ±100 mV, and record the actual voltage as V
.
in
5. Measure and record the output voltage as V
6. Calculate attenuation as |V
in
÷(V
out–Voffset
.
out
)|.
7. Verify that the attenuation is in the range of 4.75 to 5.25. Record the results in the test record.
8. Reverse the polarity of the input voltage for the following measurements. (Swap the MicroCKT test tips or the Y-lead
adapter.)
9. Measure and record the output voltage as V
.
out
10. Calculate attenuation using the formula in step 6.
11. Verify that the attenuation is in the range of 4.75 to 5.25. Record the results in the test record.
Disconnect the probe from the test setup and connect it to any oscilloscope channel to keep the probe at operating
temperature.
16 TDP3500 and TDP4000 Technical Reference
Rise Time
This procedure verifies that the probe meets the warranted rise time specification. Two rise times are measured; the
test system alone, and then the test system with the probe included. The probe rise time is calculated using the two
measurements.
This test uses the TDR function of the 80E04 sampling head as a fast rise time signal source. A second 80E0X sampling head
is used to take the measurements. Although the following procedure assigns the TDR and measurement functions to specific
oscilloscope channels, any channels can be used. However, the TDR function is only available on 80E04 sampling heads.
CAUTION. To prevent damage, use care when working with SMA connectors: s upport equipment to avoid mechanical strain
on the connectors, and when tightening connections, use a torque wrench to 7.5 in-lbs.
Test System Rise Time
1. Connect the 80E04 sampling head to Channel 1 of the sampling oscilloscope. (See Figure 12.)
2. Connect the 80E0X sampling head to Channel 8 of the sampling oscilloscope.
3. Connect SMA cables to Channels 1 and 8 on the sampling heads.
4. Connect the SMA cable from Channel 1 to an SMA-to-BNC adapter, and then to the BNC connector on the TekVPI
adapter.
Performance ver
ification
5. Connect the SMA c
6. Turn on Channel 8
Figure 12: Test system rise time setup
able from Channel 8 to the SMA connector on the TekVPI adapter.
and set the vertical scale to 50 mV/div.
TDP3500 and TDP4000 Technical Reference 17
Performance ver
7. Set the Channel 1 sampling head to TDR mode: press the SETUP DIALOGS button and select the TDR tab. (See
Figure 13 on pag
ification
e 18.)
8. Set the Channe
9. Set the Preset
l1(C1) Polarity to positive (rising).
of Channel 1 on. TDR Preset sets Internal Clock in the Trigger menu, turns on the TDR Step in the
TDR Setups menu, turns on the channel and selects the acquisition Units in the TDR Setups menu, and sets the
horizontal scale, position, and reference. The sampling module will turn on a red light next to the SELECT channel
button, indi
cating that TDR is activated for that channel.
Figure 13: TDR parameter setup
10. Turn off the display for Channel 1 so that only Channel 8 is shown on screen.
11. Adjust the oscilloscope horizontal and vertical position controls to display a signal similar to that shown. (See Figure 12.)
12. Set the oscilloscope horizontal scale to 50 ps/div and center the waveform.
13. Use the oscilloscope measurement capability to display rise time. Increase the stability of the pulse edge measurement
by using averaging, if available. Rise time is determined from the 10% and 90% amplitude points on the waveform.
Record the rise time as t
.
s
18 TDP3500 and TDP4000 Technical Reference
Performance ver
Test System and Probe Rise Time
14. Disconnect the SMA cable and BNC adapter from the Channel-1 side of the TekVPI Calibration fixture. (See Figure 14.)
15. Connect the SMA cable from Channel 1 of the sampling oscilloscope to the S MA connector on the Probe Calibration
Fixture. Leave the 50 Ω termination on the other SMA connector.
16. Plug the probe into the TekVPI Calibration fixture.
17. Probe the DM pins on the Probe Calibration Fixture. A probe positioner may be helpful. ( See Figure 8 on page 12.)
18. Set the TekVPI oscilloscope offset to 0.0 V.
ification
Figure 14: Probe rise time setup
. The following measurements are taken with the sampling oscilloscope. The TekVPI oscilloscope only provides
NOTE
power and offset to the probe.
TDP3500 and TDP4000 Technical Reference 19
Performance ver
19. On the sampling oscilloscope, expand the horizontal scale to locate the step edge: set the vertical scale to 10 mV/div,
and adjust hori
turn on averaging.
20. Adjust the position controls on the sampling oscilloscope to display the entire leading edge waveform.
21. Use the measurement capability of the sampling oscilloscope to display rise time. Increase the stability of the pulse
edge measurement by using averaging, if available. Rise time is determined from the 10% and 90% amplitude points on
the waveform
ification
zontal range to 200 ps/div while maintaining the edge view. For a more stable measurement display,
. Record the rise time as t
s+p
.
22. Using the tes
t system rise time (t
) that you measured in step 13, and the test system and probe rise time (t
s
measured in step 21, calculate the probe-only rise time using the formula shown.
Example:
This completes the performance verification.
) that you
s+p
20 TDP3500 and TDP4000 Technical Reference
Table 6: Test Record
Performance ver
ification
Probe Model/Se
Temperature: _____________ RH % : _____________
Date of Calibration: _____________Technician: _____________
Performance test Minimum Measured/Calculated Maximum
DC attenuation accuracy
Differentia
standard polarity
with connections reversed
Rise time
TDP3500 at 3.5 GHz
rial Number: _____________ Certificate Number: _____________
4.9 _____________ 5.1
lsignalrange
4.75
4.75
≤140 ps _____________ N/A
__________
_____________
___
5.25
5.25
TDP3500 and TDP4000 Technical Reference 21
Maintenance
Maintenance
This section contains maintenance information for the TDP3500 and TDP4000 Differential Probes.
Inspection and cleaning
Protect the probe from adverse weather conditions. The probe is not waterproof.
CAUTION. To
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. A swab is useful for cleaning narrow spaces on the probe. Do
not use abr
CAUTION. To prevent damage to the probe, avoid getting moisture inside the probe during exterior cleaning, and use only
enough solution to dampen the swab or cloth. Use a 75% isopropyl alcohol solution as a cleanser, and rinse with deionized
water.
prevent damage to the probe, do not expose it to sprays, liquids, or solvents. Do not use chemical cleaning
asive compounds on any part of the probe.
Replacement parts
Due to the sophisticated design of these differential probes, there are no user replaceable parts within the probes. Refer to
the Quick Start User Manual for a list of replaceable accessories for your probe.
If your probe does not meet the specifications tested in the Performance Verification, you can send the probe to Tektronix for
repair. Follow the procedure below to prevent damage to the probe during shipping.
Preparation for shipment
e original packaging is unfit for use or not available, use the following packaging guidelines:
If th
1. Use a
2. Put the probe into an antistatic bag or wrap to protect it from dampness.
3. Place the probe into the box and stabilize it with light packing material.
4. Seal the carton w ith shipping tape.
5. Refer to Contacting Tektronix on the copyright page for the shipping address.
22 TDP3500 and TDP4000 Technical Reference
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.
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