ZZZ
xx
TCA-1MEG
High Impedance Buffer Amplifier
Instruction Manual
*P071101004*
071-1010-04
xx
ZZZ
TCA-1MEG
High Impedance Buf
fer Amplifier
Instruction Manual
Warning
The servicing instructions are for use by
qualified personnel only. To avoid personal
injury, do not perform any servicing unless
you are qualified to do so. Refer to all safety
summaries prior to performing service.
www.tek.com
071-1010-04
Copyright © Tektronix. All rights re
owned by Tektronix or its subsidiaries or suppliers, and are protected by natio nal
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 p reviously p ublished
material. Specifications and p
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
served. Licensed software products are
rice change privileges reserved.
Contacting Tektronix
Tektronix, In c.
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 1-800-83 3-9200.
Worldwide, visit www.tek.com to find contacts in your area.
Warra nty
Tektronix warrants that this produ
workmanship for a period of one (1) year from the date of shipment. If any such product
proves defective during this w
the defective product without charge for parts and labor, or will provide a replacement
in exchange for the defective
Tektronix for warranty work may be new or reconditioned to like new performance. All
replaced parts, modules and
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 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 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 I
TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHAN
RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE
SOLE AN
BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE
LIABL
DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VEN DOR HAS
ADV
[W2 – 15AUG04]
N LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED.
TABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX'
D EXCLUSIV E REMEDY PROVIDED TO THE CUSTOMER FOR
E FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
ANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
ct will be fre e from defects in materials and
arranty period, Tektronix, at its option, either will repair
product. Parts, modules and replacement products used by
products become the property of Tektronix.
Table of Contents
Important safety information ............................................ v
General safety summary ............................................ v
Service safety summary................................. ......... viii
Terms in this manual ................................. .............. ix
Symbols and terms on the product.............................. .. ix
Compliance information ........................................... ...... x
Safety compliance.............................. ..................... x
Environmental considerations.......................... ......... xiii
Preface........................... ........................................ xv
Getting started ............ ................................................ 1
Product description......................................... ......... 1
Accessories .................................. ........................ 3
Input voltage derating............................................... 4
Probe calibration for high accuracy. . .. .. . .. .. .. . .. .. .. . .. .. . .. .. .. 4
Functionality not supported ............. ........................... 5
Installation ................. .......................................... 6
Connecting the TCA-1MEG to the host instrument.............. 7
Connecting a probe to the TCA-1MEG ........................... 8
Attaching and grounding a TCA-1MEG system.................. 9
Functional overview ............ .................................. 10
Cleaning............................................................ 11
Functional checks .................... .................................. 13
Prerequisites ............................................. .......... 13
Required equipment.................................. ............. 14
Run the SPC (Signal Path Compensation) on the host
instrument..................................................... 16
Calibrate the TCA-1MEG to the host instrument............... 16
Calibrate the P6139B Passive Voltage Probe to the TCA-1MEG
and host instrument ....................... ................... 18
LF probe compensation.................................... ....... 20
Check vertical input coupling .................................... 22
Check bandwidth limit............................................ 26
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual i
Table of Contents
Specifications ...................................... ..................... 31
Performance verification............................. .................. 35
TCA-1MEG system bandwidth .......... ........................ 37
Replaceable parts ... . .. .. . .. .. .. . .. .. . .. .. . .. .. . .. .. .. . .. .. . .. .. .. . .. .. . 41
ii TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
List of Figures
Figure 1: TCA-1MEG High Impedance Buffer Amplifier............ 1
Figure 2: Connecting a nd disconnecting the TCA-1MEG . . .. .. .. . .. . 7
Figure 3: Calibration data message .......... ........................... 8
Figure 4: TekConnect and TEKPROBE Interface features .. . .. . .. . 10
Figure 5: Simplified block diagram................................... 11
Figure 6: Probe Comp ensation output of the TDS6604 .. . .. .. .. . .. . 15
Figure 7: Setup with the P6139B attached to the TCA-1MEG. . .. . 20
Figure 8: Probe compensation waveforms .......................... . 21
Figure 9 : Test equipment hookup for the Vertical Input C ou pling and
Bandwidth Limit checks....................... ................... 22
Figure 10: Typical waveform at GND....... ......................... 23
Figure 11: Typical waveform at AC Coupling....................... 24
Figure 12: Typical waveform at DC Coupling....................... 25
Figure 13: Typical waveform at Full (500 MHz) bandwidth .. . .. .. 27
Figure 14: Typical waveform at 100 MHz bandwidth ............. . 28
Figure 15: Typical waveform at 20 MHz bandwidth................ 29
Figure 16: Typical Input Impedance and Phase versus Frequency . 33
Figure 17: Voltage Derating versus Frequency ...................... 33
Figure 18: TCA-1MEG dimensions ............... ................... 34
Figure 19: TCA-1MEG system bandwidth equipment hookup . .. . 37
Figure 20: TCA-1MEG replaceable parts . . .. .. .. . .. .. . .. .. .. . .. .. . .. 42
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual iii
Table of Contents
List of Tables
Table 1: Compatible devices that require high impedance input .. . .. 2
Table 2: Required equipment
Table 3: Warranted electrical specifications.......................... 31
Table 4: Typical electrical characteristics .... ........................ 32
Table 5: Physical charact
Table 6: Environmental characteristics.... ........................... 34
Table 7: Equipment required for performance verification ......... 35
Tab le 8: TC A -1MEG test
Table 9: TCA-1MEG replaceable parts.. . .. .. .. . .. .. .. .. . .. .. .. . .. .. . 42
.................................... ...... 14
eristics ....................... ............... 34
record...................................... 40
iv TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Important safety information
This manu al contains informat
by the user for safe operation and to keep the product in a s afe condition.
To safely perform service on t
is provided at the end of this section. (See page viii, Service safety
summary.)
General safety summary
Use the product only as specified. Review the following safety
precautions to avoid i
products connected to it. Carefully read all instructions. Retain these
instructions for future reference.
Comply with local and national safety codes.
For correct and saf
follow generally accepted safety procedures in addition to the safety
precautions specified in this manual.
The product is designed to be used b y trained personnel only.
Only qualified
remove the cover for repair, maintenance, or adjustment.
Before use, a
is operating correctly.
lways check the product with a known source to be sure it
njury and prevent damage to this product or any
e operation of the product, it is essential that you
personnel who are aware of the hazards involved should
ion an d warnings that must be followed
his product, additional information
This produc
Use personal protective equipment to prevent shock and arc blast injury
where haz
While using this product, you may need to access other parts of a larger
system.
warnings and cautions related to operating the system.
When in
system is the responsibility of the assembler of the system.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual v
t is not intended for detection of hazardous voltages.
ardous live condu ctors are exposed.
Read the safety sections of the other component manuals for
corporating this equipment into a system, the safety of that
Important safety information
To a void fire or personal injury
Ground the product. This p rod uct is indirectly grounded through the
grounding conductor of the mainframe power cord. To avoid electric
shock, the grounding conductor must be connected to earth ground.
Before making connections to the input or output terminals of the
product, make sure that the product is properly grounded.
Do no t disable the power cord groundin g connection.
Connect and disconnect properly. Do not connect or disconnect probes
or test leads while they are connected to a voltage source.
Use only insulated voltage probes, test leads, and adapters supplied with
the product, or indicated by Tektronix to be suitable for the product.
Observe all terminal ratings. To avoid fire or shock hazard, observe all
ratings and markin gs on the product. Consult 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. Use caution when using 1:1 test leads because the
probe tip voltage is directly transmitted to the product.
Do not apply a potential to any terminal, including the common
terminal, that exceeds the maxim um rating of that terminal.
Do not float the common terminal above the rated voltage for that
terminal.
The measuring terminals on this product are not rated for connectio n
to mains Category III or IV circuits, or to mains Category II circuits
greater than 100 V.
When connected to circuits other than mains, the maximum transient
overvoltage rating is 400 V peak.
Do not operate without covers. Do not operate t his 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.
vi TCA-1MEG High Im ped a nce Buffer Amplifier Instruction Manual
Important safety information
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.
Before use, inspect voltage probes, test leads, and accessories for
mechanical damage and replace when damaged. Do not use probes or
test leads if they are damaged, if there is exposed metal, or if a wear
indicator shows.
Examine the exterior of the product before you use it. Look for cracks
or missing pieces.
Do not operate in wet/damp conditions. Be aware that condensation may
occurifaunitismovedfromacold to a warm environment.
Do not operate in an explosive atmosphere.
Keep product su rfaces clean and dry.
you clean the product.
Remove the input sig nals before
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual vii
Important safety information
Service safety summary
The Service safety summ ary section contains additional information
required to safely perform service on the produ ct. Only qualified
personnel should perform service procedures. Read this Service safety
summary and the General safety summary b efore performing any
service procedures.
To avoid electric shock. Do
Do not service al one. Do not perform internal service or adjustments of
this product u nless another person capable of rendering first aid and
resuscitation is present.
Use care when servicing with power on. Dangerous voltages or currents
may exist in this pro
applicable), and disconnect test leads before removing protective panels,
soldering, or replacing components.
Verify safety after repair. Always recheck ground continuity and mains
dielectric strength after performing a repair.
not touch exposed connections.
duct. Disconnect pow er, remove battery (if
viii TCA-1MEG High Impedance Buffer Amp lifier Instruction Manual
Terms in this manual
These t erm s 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 term s 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.
Important safety information
When this symbol is marked on the product, be sure to consult
the manual to find out the n ature of the potential hazards and
any actions which have to be taken to avoid them. (This symbol
may also be used to refer the user to ratings in the manual.)
The following symbol(s) may appear on the product:
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual ix
Compliance information
Compliance information
This section lists the safety and environmental standards with which
the instrument complies.
Safety compliance
This sectio n lists the safety stan dards with which the product com plies
and other safety co mpliance information.
EU declaration of conformity – low voltage
Compliance was demonstrated to the following specification as listed
in the Official Journal of the European Union:
Low Voltage Directive 2006/95/EC.
EN 61010-1. Safety Requirements for Electrical Equipment for
Measurement, Control, and Laboratory Use – Part 1: General
Requirements.
EN 61010-2-030. Safety Requirements for Electrical Equipment
for Measurement, Control, and Laboratory Use – Part 2-030:
Particular requirements for testing and measuring circuits.
nationally recognized testing laboratory listing
U.S.
UL 61010-1. Safety Requirements for Electrical Equipment for
Measurement, Control, and Laboratory Use – Part 1: General
Requirements.
UL 61 010 -2 -03 0. Safety Requirements for Electrical Equipment
for Measurement, Control, and Laboratory Use – Part 2-030:
Particular requirements for testing and measuring circuits.
Canadian certification
CAN/CSA-C22.2 No. 61010-1. Safety Requirements for Electrical
Equipment for Measurem ent, Control, and Laboratory Use – Part 1:
General Requirements.
CAN/CSA-C22.2 No. 61010-2-030. Safety Requirements for
Electrical Equipment for Measurement, Control, and Laboratory
x TCA-1MEG High Impedance Buffer A mplifier Instruction Manual
Compliance information
Use – Part 2-030: Particular requirements for testing and measuring
circuits.
Additional compliances
IEC 61010-1. Safety Requirements for Electrical Equipment for
Measurement, Control, and Laboratory Use – Part 1: General
Requirements.
IEC 61010 -2-03 0. Safety Requirements for Electrical Equipment
for Measurement, Control, and Laboratory Use – Part 2-030:
Particular requirements fo r testing and measuring circuits.
Equipment type
Test and measuring equipment.
Safety class
Class 1 – grounded product.
Pollution degree descriptions
A measure of the contam inants that could occur in the environment
around and within a p roduct. Typically the internal env ironment inside
a product is considered to be the same as the external. Products should
be used only in the environment for which they are rated.
Pollution degree 1. No pollution or only dry, nonconductive
pollution occurs. Products in this category are generally
encapsulated, hermetically sealed, or located in clean rooms.
Pollution degree 2. Normally only dry, nonconductive pollution
occurs. Occasionally a temporary conductivity that is caused
by condensation must be e xpected. This location is a typical
office/home environment. Temporary condensation occurs only
when the product is o ut of service.
Pollution degree 3. Conductive pollution, or dry, nonconductive
pollution that becomes conductive due to condensation. These
are sheltered locations where neither temperature nor humidity
is controlled. The area is protected from direct sunshine, rain, or
direct wind.
Pollution d eg ree 4. Pollution that generates p e rsistent conductivity
through conductive dust, rain, or snow. Typical outdoor locations.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual xi
Compliance information
Pollution degree rating
Pollution degree 2 (as defined in IEC 61010-1). Rated for indoor, dry
location use only.
IP rating
IP20 (as defined in IEC 60529).
Measurement and overvoltage category descriptions
Measurement terminals on this product may be rated for measuring
mains voltages from one o r more of the following categories ( see
specific ratings marked on the product and in the manual).
Category II. Circuits directly connected to the building wiring at
utilization points (socket outlets and simi lar points).
Category III. In the building wir ing and distribution system.
Category IV. At the source of the electrical supply to the building.
NOTE. Only mains power supply circuits have an overvoltage category
rating. Only measurement circuits have a measurement category rating.
Other circuits within the product do not have either rating.
Mains overvoltage category rating
Overvoltage
xii TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
category II (as defined in I EC 61010-1).
Environmental c onsiderations
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 equipment required the
extraction and use of nat
substances that could be harmful to the environment or human health
if im pro perly handled at the product’s end of life. To avoid release of
such sub s tances into th
resources, w e 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, check the Tektronix
website (www.tek.com/productrecycling).
ural resources. The equipment may contain
e env ironm ent and to reduce the use of natural
Compliance information
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual xiii
Compliance information
xiv TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Preface
This is the Instruction manual
Buffer Amplifier. Read this preface to learn how this manual is
structured and what conventions it uses. Before using this manual or the
TCA-1MEG amplifier, read the G
safety summary sections at the beginning of this manual for safety and
other important background information.
Manual structure
This manual is divided into sections, which are made of related topics:
Getting started includes a product description, list of accessories,
and instructions for installation.
Functional checks includes procedures for verifying that the
TCA-1MEG functions properly with a host instrument.
Specifications includes warranted electrical specifications, typical
electrical characteristics, and graphs for typical input impedance,
and typical band
Performance verification includes a procedure for verifying
warranted ele
NOTE. Servic
Applicatio
instrument
ns CD ROM (Tektronix part number 063-3376-XX) for your host
, and is also available for do wnload from the Tektronix website.
for the TCA-1MEG High Impedance
eneral safety summary and Service
width.
ctrical specifications.
e software for this instrument is included on the TDS
Be sure to read the introductory text for each procedure, which provide
important information needed to use the TCA-1MEG High Impedance
Buffer Amplifier correctly, safely, and efficiently.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual xv
Preface
Manual conventions
The fo llo win g conventions are used in this manual:
Safety
Symbols and terms related to safety appear in the Service safety
summary found a t the beginnin
gofthismanual.
xvi TCA-1MEG High Impedance Buffer Amplifier Instruction M anual
Getting started
Product description
The TCA-1MEG is a High Impedance Buffer Amplifier system that
broadens the functionality of a TekConnect host instrument. Features
include:
Input impedance — 1 MΩ,10pF
Bandwidth — 500 MHz
Bandwidth limit (selectable) — Full (500 MHz), 100 MHz, and
20 MHz
Input coupling (selectable) — AC, DC, and GND
Input Connection — 1 MΩ TEKPROBE BNC
The TCA-1MEG amplifier, or other Tektronix TekConnect probes and
adapters, enable you to easily configure each channel of your host
instrument for the input characteristics you require.
To achieve a 1 MΩ system when you need it, use this amplifier to
connect a Tektronix 1 MΩ TEKPROBE BNC probe or other standard
1MΩ BNC accessory to your 50 Ω TekConnect host instrument.
To regain your high-speed, 50 Ω signal path, simply replace the
TCA-1MEG with a high performance TekConnect probe or adapter.
Figure 1: TCA-1MEG High Impedance Buffer Amplifier
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 1
Getting started
The table below lists Tektronix high-voltage passive probes,
high-voltage active probes, current probes, and other measurement
analysis tools that require high impedance input. Use these devices with
the TCA-1MEG to extend the use of your TekConnect host instrument.
Table 1: Compatible devices that require high impedance input
Device type Model Description
Passive voltage
probes
High voltage probes P6015A 20 kV, 1000X, 75 MHz, passive
Micro-volt
differential p
Current probes
Others
1
N
P6101B 15 MHz, 1X, passive
P6139B 500 MHz, 1 0X, passive
P5100A 2.5 kV, 100X, 500 MHz, passive
P5205A
P5210A
ADA400A
1.3 kV, 200 MHz, active differential
4.4 kV, 100 MHz, active differential
100X / 10X / 1X / 0.1X preamplifier
robe
P6021A
P6022
AC, 15 A
AC, 6 A
,60MHz
p-p
, 120 MHz
p-p
AM503S AC/DC current amplifier
measurement system
012-0057-01
0049-02
011-
012-0482-00
50 Ω BNC-to-BNC coaxial cable
50 Ω feed through termination
50 Ω BNC-to-BNC coaxial cable,
male to male
ine-digit part numbers (xxx-xxxx-xx) are Tektronix part numbers.
2 TCA-1MEG High Impedance Buffer A mplifier Instruction Manual
Accessories
The TCA-1MEG amplifier package has a set of standard accessories.
Standard accessories for the TCA-1MEG
P6139B 10X Passive Probe with standard accessories and
instructions
Certificate of Traceable Calibration
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
(Tektronix part number 071-1010-XX)
TDS6000 Series Product Software (Tektronix p art number
063-3541-XX), also available on the Tektronix website
TDS7000 Series Product Software (Tektronix p art number
063-3461-XX), also available on the Tektronix website
Optional accessories for the TCA-1MEG
Service software for the TCA-1MEG is included on the
TDS Applications Software CD for your host instrument. The CD is
also available as an optional accessory for the TCA-1MEG (Tektronix
part number 063-3376-XX). The software is also available for download
from the Tektronix website. The Tektronix website provides up-to-date
firmware and software upgrades.
Getting started
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 3
Getting started
Input voltage derating
The TCA-1MEG is designed to be used in a high voltage environment.
However, voltage input rating decreases as the frequency of the applied
signal increases. Refer to Specifications for input voltage rating and
voltage versus frequency derating information. (See page 31.)
Probe calibration for high accuracy
To ensure high accuracy, you should run a probe calibration routine
on the TCA-1MEG:
When the ambient temperature changes by more than 5 °C (9 °F)
from the temperature of the previous calibration
When you install the TCA-1MEG on a host instrument channel
where it has not been calibrated previously
Refer to Functional checks for the probe calibration p rocedure. (See
page 13.)
Probes or adapters with the following characteristics will not calibrate
using the internal calibration signal of the TekConnect host instrument:
Probes or adapters without TEKPRO BE readout capabilities
Probes with attenuation levels greater than 20X, due to the low
signal level at the output of the internal calibration generator
4 TCA-1MEG High Impedance Buffer A mplifier Instruction Manual
Functionality not supported
50 Ω termination at BNC input
The TCA-1MEG amplifier does not provide a 50 Ω termination at its
BNC input. If you require 50 Ω termination for y our applications,
use a Tektronix TekConnect 50 Ω adapter (TCA-BNC, TCA-SMA, or
TCA-N) in place of the TCA-1MEG. When the host instrum ent detects
an incompatible device connected to the TCA-1MEG, it displays a
message that an incompatible combination of accessories has been
installed. The host instrument, however, will not detect all incompatible
devices.
Readout and power connection pins
The BNC connector of the TCA-1MEG is not compatible for use with
nonTektronix probes, cables, and adapters that have readout or power
connection pins.
CAUTION. To avoid damage to your equipment, do not use the TCA-1MEG
with nonTektronix probes, cables, and adapters that have readout or power
connection pins.
Getting started
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 5
Getting started
Installation
The TCA -1MEG connects directly to the TekConnect interface on the
TekConnect host instrument.
Firmware requirements
To ensure compatibility of your TekConnect host instrument with the
TCA-1MEG, your host instrument (for example, TDS6000, TDS7000,
or CSA7000 Series) must have the firmware upgrade V2.1.0 or higher.
CAUTION. To avoid instrument malfunctions, do not overwrite V2.1.0 or
higher firmware with an earlier version of firmware. Doing so would
require reinstallation of up-to-date firmware on the host instrumen t.
Firmware upg rade ins
with the TCA-1MEG. The upgrades a re also available on the Tektronix
website at www.tek.com. Select the Software & Drivers link on the
home page of the we
software and firmware upgrades.
tructions are available on the CD ROMs included
bsite. The Tektronix website provides up-to-date
6 TCA-1MEG High Impedance Buffer A mplifier Instruction Manual
Connecting the TCA-1MEG to the host instrument
The TekConnect Interface features a spring-loaded latch that provides
audible and tactile confirmation that a reliable connection has been
made to the TekConnect host instrument. Slide the TCA-1MEG into the
TekConnect receptacle on the host instrument. The unit snaps into the
host instrument when fully engaged. (See Figure 2.)
To release the TCA-1MEG fro m the host instrument, grasp the unit,
depress the latch button, and pull it out of the TekConnect receptacle.
Getting started
Figure 2: Conn
NOTE. If you connect the TCA-1MEG to a channel wh ere it has already
been probe c alibrated, a message may appear on the display screen. (See
Figure 3 on page 8.) Follow the instructions on the message.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 7
ecting and disconnecting the TCA-1MEG
Getting started
Figure 3: Calibration da
ta message
Connecting a probe to the TCA-1MEG
WARNING. To a v oi d fire or personal injury, connect the TCA-1MEG
amplifier to the host instrument, then connect the probe or other input
device to the TCA-1MEG. Connect the probe or other input device to the
device-under-test.
Before disconn
the probe or oth
device-under
the TCA-1MEG
Before yo u connect a probe or other device, ensure that the device is
compatible with t he TCA-1MEG. (See page 1, Getting started.) (See
page 5, Functionality not supported.)
ecting the TCA-1MEG from the host instrument, disconnect
er input device, and the probe ground, from the
-test, and then disconnect the probe or other input device from
amplifier.
8 TCA-1MEG High Impedance Buffer A mplifier Instruction Manual
Getting started
Follow the instructions in your probe manual for connecting your probe
or other device to a TEKPROBE BNC connector.
NOTE. The maximum V/division setting with a 1X probe, or with no probe,
is 10 V/division. The Volts/division of the host instrument may change when
you connect probes with different attenuation factors.
Before connecting a probe or
refer to the list of compatible devices. (See Table 1 on page 2.)
other device to the TCA-1MEG, alw ays
Attaching and grounding a TCA-1MEG system
Always use these procedures for safely connecting a nd disconnecting
the TCA -1 MEG and probe to the circuit under test.
WARNING. To avoid fire or personal injury, connect the TCA-1MEG and
probe output to the measurement instrument before connecting the probe or
other input device to the circuit under test. Disconnect the probe input and
probe ground from the circuit under test before disconnecting the probe or
the TCA-1MEG from the measurement instrument.
After connecting the TCA-1MEG to the host instrument and connecting
a probe to TCA-1MEG, co nnect the ground lead of the probe to the
ground of the circuit under test before taking any measurements.
Be careful that no part of the ground lead or probe grou nding ring
contacts voltage in the circuit under test. Except for the probe tip and
BNC center conductor, all accessible metal (including the ground clip)
is connected to the BNC outer shell and is considered earth ground.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 9
Getting started
Functional overview
TekConnect-to-TEKPROBE Interface
The TCA-1MEG is powered through the Tektronix TekConnect
Interface. The TekConnect Interface provides a communication path
through contact pins on the host instrument. Power, signal, offset,
and probe characteristic data transfer through the interface to the host
instrument. (See Figure 4.) Also, refer to your oscilloscope or probe
documentation for more detailed specifications.
Figure 4: TekConnect and TEKPROBE Interface features
When the TCA-1MEG is connected to the host instrument, the
input of the ho
was previously connected to the host instrument channel, the input
coupling and bandwidth limit are set to the settings previousl y used.
If the TCA-1M
channel, the i nput coup ling and bandw idt h limit are set to the default
TCA-1MEG settings (DC coupling and Full bandwidth).
When a probe is connected to the TCA-1MEG, the host instrument
reads its attenuation factor and displays readouts adjusted for the
attenuat
the connected probe requires it.
10 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
st instrument is set to 1 MΩ. If the TCA-1MEG
EG has never been connected to the host instrument
ion factor of the probe. The host instrument controls offset if
Operating characteristics
Although the TCA-1MEG am plifi er has no replaceable parts, this
functional overview is intended to help you isolate failures to either the
probe or the host instrument. Refer to the simplified block diagram
of the amplifier. (SeeFigure5.)
Figure 5: Simplified block diagram
Cleaning
Getting started
Follow these gui
General care. Do not use chemical cleaning agents. Avoid using
chemicals that contain acetone, benzene, toluene, xylene, or similar
solvents because they may damage the plastic.
Clean the exterior surfaces with a dry, lint-free cloth or a soft-bristle
brush. If dirt remains, use a cloth or swab dampened with a 75%
isopropyl alcohol solution. A swab is useful for cleaning in narrow
spaces around the TekConnect release button and connectors. Do not
use a brasive compounds on any part o f the instrument.
CAUTION. To avoid permanent damage to the TCA-1MEG while cleaning,
use only enough solution to dampen the cloth or swab. The TCA-1MEG is
not waterproof.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 11
delines for cleaning the TCA-1MEG amplifier.
Getting started
12 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
Functional checks
The purpose of these procedures is to confirm th at the TCA-1M E G
High Impedance Buffer Amplifier functions properly with the host
instrument.
The following functions are checked:
Probe L F compensation
Vertical input coupling
Bandwidth limit
NOTE. To perform these procedures, you should be familiar with the basic
operation, control, and setup of the TekConnect host instrument. Refer to the
host instrument manual and online help for detailed operating information.
Prerequisites
The conditio ns listed below must be met in the following order before
you perform the functional checks:
1. The host instrument, TCA-1MEG, and probe must have been
operating for a warm-up period of at least 20 minutes.
2. The host instrument SPC (Signal Path Compensation) must be run
at an ambient temperature between +20 °C and +30 °C. (Disconnect
the TCA-1MEG
and probe when you run the SPC.)
3. The TCA-1MEG calibration procedure must b e performed. (See
page 16, Cali
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 13
brate the TCA-1MEG to the host instrument.)
Functional checks
Required equipment
Table 2: Required equipment
Performance
Description
Oscilloscope TekConnect interface TDS6000, TDS7000,
Cable 50 Ω coaxial,
Probe tip adapter
1
See Required oscilloscope firmware version below.
requirement
male-to-male
BNC, unterminated
Recommended
example
CSA7000
Tektronix part number
103-0226-XX
Tektronix part number
013-0367-XX
1
Required oscilloscope firmware version
To ensure compatibility of your TekConnect host instrument with the
TCA-1MEG, your host instrument (for example, TDS6000, TDS7000,
or CSA7000 Series) must have firmware version V2.1.0 or higher.
Upgrade instructions are a vailable on the included CD ROM, or visit our
website at www.tek.com and select the Software and Drivers link. The
Tektronix website provides up-to-date firm ware and software upgrades.
TCA-1MEG readings on the host instrument
The T CA -1MEG readings on the host instrument display screen may
vary from instrument to instrument.
The output amplitude and frequency shown for the TCA-1MEG is
dependent on th e probe compensation output of the TekConnect host
instrument. The output amplitude, frequency, and voltage offset of
the h ost instrument is shown next to the Probe Compensation output
connector. (See Figure 6.)
14 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
Functional checks
Figure 6: Probe Compensa
NOTE. Unless specifically directed, do not terminate the probe
compensation output of the host instrument or the TCA-1MEG input with a
50 Ω feedthrough terminator.
tion output of the TDS6604
Reference commands on the host instrument
The following test procedures use so me of the commands available on a
TDS6604 Oscilloscope. These commands are similar to the commands
that other TekConnect host instruments use. Refer to the host instrument
user manual and online help for more information.
To set up your host instrument to
enable quick- setting changes while
testing:
1. On the display screen, choose
Buttons display.
2. On the front panel, activate
Touch Scre en.
3. On the Vertical menu, select
Vertical Setup. A tabbed panel
of Vertical options displays
across the bottom of the
screen.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 15
Functional checks
Run the SPC (Signal Path Compensation) on the host
instrument
You m ust run the SPC on the host instrument before you calibrate the
TCA-1MEG to yo ur host instrument. Do the following:
1. Warm up the instrument for 2 0 minutes.
2. From th e Utilities menu, select Instrument Calibr ation.
3. In the Calibratio n box, check that the Status field is Pass.Ifitis
not, disconnect all probes and signal sources from the instrument.
4. In the Calibration box, click the Calibrate button.
5. When the Status field is Pass, proceed to the Calibrate the
TCA-1MEG to the H ost Instrum ent procedure.
Calibrate the TCA-1MEG to the host instrument
You must perform a calibration of the TCA-1MEG to your host
instrument befo re you perform the functional checks. A BNC-to-BNC
50 Ω coaxial cable (or suitable equivalent) is required for this procedure.
Perform the TCA-1MEG calibration routine:
The first time that you connect the TCA-1MEG and/or probe to the
host in strument (allow a 20 minute warm-up period).
If you move the TCA-1MEG and/or probe to a new channel or
host instrument.
If the host instrument, TCA-1MEG or probe have had an SPC,
repair, or calibration.
This procedur e only calibrates the TCA-1M E G to the TekConnect host
instrument. If you in tend to use a probe with the TCA -1 MEG, you must
also perform the Calibrate the P6139B Passive Voltage Probe to the
TCA-1MEG and host instrument procedure. (See page 18.)
16 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
Functional checks
Test equipment hookup.
1. Connect the TCA-1MEG to the channel that you intend to use on
your host instrument.
2. Connect a BNC-to-BNC 50 Ω coaxial cable to the BNC input of the
TCA-1MEG. Do not terminate the cable with a 50 Ω terminator.
3. Connect the other end of the BNC-to-BNC 50 Ω coaxial cable to
the PROBE COMPENSATION connector of the host instrument.
Test procedure.
1. On the Vertical menu, select Probe Cal. A probe calibration panel
appears along the right side of the screen.
2. Select the signal channel to which the TCA-1MEG is connected.
3. Choose Calibrate Probe. This operation may take several m inu tes.
Do not remove the TCA-1MEG or cable during this operation.
4. When p ro be calibration is complete, the Probe Status field should
read Pass.Ifthefield reads Fail, contact your Tektronix Service
representative.
NOTE. For Volts/division settings≥10 mV/division, the typical Displa yed
System Input Offset is ±0.2 divisions or less, when used within ±5 °C
(±9 °F) of the calibrated te mperature.
5. Close the pro
The TCA-1MEG is now calibrated to the host instrument for the
specified c
channel or to another host instrument, you must repeat this
procedure.
6. Proceed to the functional checks.
If you at
Calibrate the P61 39B Passive Voltage Probe to the TCA-1MEG and
host instrument procedure. (See page 18.)
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 17
tach a probe to the TCA-1MEG, you must perform the
be calibration p anel.
hannel only. If you move the TCA-1 MEG to another
Functional checks
Calibrate the P6139B Passive Voltage Probe to the
TCA-1MEG and host instrument
A P61 39B probe and an in strument calibration connecti on (or suitable
equivalent)
are r equired for this procedure.
NOTE. Va r i
require yo
is co nnec
differe
TCA-1M
If a 1 kHz calibrated square wave displayed at 1 ms/division shows
significant amplitude differences between the leading and trailing edges,
perform the LF Probe Com pensation procedure to optimize low-frequency
compensation. (See page 20.)
Test equipment hookup.
1. Connect the TCA-1MEG to a channel on your host instrument.
2. Connect the probe to the TEKPROBE input of the TCA-1MEG.
3. Using a nonterminated probe tip-to-BNC adapter, connect the
4. Check for proper LF compensation: If a 1 kHz calibrated square
Test procedure.
ations in the characteristics of the TCA-1MEG and/or probe
u to adjust the low-frequency compensation of the p robe that
ted to the TCA-1MEG. Consider this whenever you connect a
nt probe to a TCA-1MEG, or when you move a probe from one
EG to ano ther.
probe to the probe calibration signal on the front panel of the host
instrument.
wave displayed at 1 ms/division shows significant amplitude
differences between the leading and trailing edges, perform the
LF probe compensation procedure to optimize low-frequency
compensation. (See page 20.)
Do the following after a warm up period of at least 20 minutes:
1. On the Vertical menu, select Probe Cal. A probe calibration panel
appears along the right side of the screen.
2. Select the signal channel to which the TCA-1MEG and/or probe
are connected.
3. Choose Calibrate Probe. This operation may take several minutes.
Do not remove the TCA-1MEG or probe during this operation.
18 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
Functional checks
4. When p ro be calibration is complete, the Probe Status field should
read Pass.Ifthefield reads Fail, contact your Tektronix Service
representative.
NOTE. For Volts/division settings≥10 mV/division, the typical Displa yed
System Input Offset is ±0.2 divisions or less, when used within ±5 °C
(±9 °F) of the calibrated te mperature.
5. Close the probe calibration panel.
The TCA-1MEG and probe ar
e now calibrated to the host instrument
for the specified channel only. If you move the TCA-1MEG and probe
to ano ther channel or to another h ost instrument, you must repeat the
TCA-1MEG and probe cal
ibration procedures.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 19
Functional checks
LF probe compensation
Variations in the TCA-1MEG input characteristics may require you to
adjust the low-frequency compensation of the probe that is connected to
the TCA-1MEG. Consider this whenever you connect a different probe
to a TCA-1MEG, or when you move a probe from one TCA-1MEG
to another.
If a 1 kHz calibrated square wave displayed at 1 ms/division shows
significant differences between the leading and trailing edges, perform
these steps to optimize low-frequency compensation:
1. Connect the TCA-1MEG to any channel on the host instrument.
2. Connect the probe to the TEKPROBE input of the TCA-1MEG.
3. Using a nonterminated probe tip adapter, connect the pro be to the
probe calibration signal on the front panel of the oscilloscope.
NOTE. After co nnecting the TCA-1MEG to the host instrument, allow them
to warm u p for at least 20 minutes before performing the functional checks.
Figure 7: Setup with the P6139B attached to the TCA-1MEG
4. Press AUTOSET or otherwise adjust your host instrument to
display a meaningful waveform.
20 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
Functional checks
5. On the Vertical menu, select Vertical Setup, and then choose the tab
of the channel to which the TCA-1MEG is connected.
a. Set coupling to DC. Set t rigger level to 50%.
b. Set bandwidth to Full .
c. Set vertical scale to 100 mV/division.
d. Setoffsetto1.6.
e. Adjust vertical position of the waveform to display on center
screen.
f. Close the panel.
6. Set horizontal scale to 1.0 ms.
7. On the Horiz/Acq menu, select Horizontal/Acquisition Setup, and
then choose the Acquisition tab.
a. Set acquisition mode to High Resolution.
b. Close the panel.
8. Adjust the trimmer in the probe (accessible through the
compensation box) until you see a square wave with a perfectly flat
top on the display. (See Figure 8.)
CAUTION. To avoid damaging the trimmer, use th e adjustment tool supplied
with your probe. Adjustment tools from some probe models may not be
compatible with your probe.
Figure 8: Probe compensation waveforms
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 21
Functional checks
Check vertical input coupling
Verify the AC, DC, and GND coupling of the TCA-1MEG.
Test equipment hookup.
Figure 9: Test equipment hookup for the Vertical Input Coupling and
Bandwidth Limit checks
Test procedure.
1. On the front panel of the host instrument, press the button
corresponding to the channel to which the TCA-1MEG is
connected.
2. Push the AUTOSET button to d isplay a waveform on the screen.
3. If autoset does not set the host instrument to 500 mV/division,
manually change vertical V/d ivision to 500 mV.
4. Using the Vertical Position control knob, position the waveform to
two divisions above center screen.
5. On the Vertical menu, select Vertical Setup, and then choose the tab
of the channel to which the TCA-1MEG is connected.
22 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
Functional checks
6. Set coupling to GND . The resulting waveform should appear as
shown. (See Figure 10.)
Figure 10: Typi
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 23
cal waveform at GND
Functional checks
7. Set Coupling to AC, and set trigg e r level to 50%. The resulting
waveform should appear as shown. (See Figure 11.)
Figure 11: Typi
24 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
cal waveform at AC Coupling
Functional checks
8. Set Coupling to DC, and set trigger level to 50%. The resulting
waveform should appear as shown. (See Figure 12.)
Figure 12: Typ
ical waveform at DC Coupling
9. Leave the Coup
ling set to DC.
10. Close the panel.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 25
Functional checks
Check bandwidth limit
Verify bandwidth limits at full, 100 MHz, and 20 MHz.
Test equipment hookup. Use the same hardware configuration as th e
Vertical input coupling chec
Test procedure. Do the following:
1. On the front panel of the host instrument, select the channel to
which the TCA-1MEG is connected.
2. Set the vertical scale to 200 mV/division.
3. Set the horizontal scale to 40 ns/division.
4. On the Vertical menu, select Vertical Setup, and then choose the tab
of the channel to which the TCA-1MEG is connected.
a. Set coupling to AC.
b. Set bandwidth to Full (500 MHz).
5. Set to trigger at 50%.
k. (See Figure 9 on p age 22.)
26 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
Functional checks
6. Set the horizontal position of the leading edge to the left of center
screen. The resu lting w a veform should appear as shown. (See
Figure 13.)
NOTE. When full bandwidth is set, overshoot and ringing on the signal is
normal and does not indicate problems with the TCA-1MEG.
Figure 13: Typical waveform at Full (500 MHz) bandwidth
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 27
Functional checks
7. Set bandwidth to 100 MHz. The resulting waveform should appear
as shown. (See Figure 14.)
NOTE. When 100 MHz bandwidth is set, the signal risetime increases and
overshoot and ringing decreases.
Figure 14: Typical waveform at 100 MHz bandwidth
28 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
Functional checks
8. Set bandwidth to 20 MHz. The resulting waveform should a p pear
as shown. (See Figure 15.)
NOTE. When the 20 MHz bandwidth limit is set, signal risetime is near
15 ns.
Figure 15: Typical waveform at 20 MHz bandwidth
9. After completing the bandwidth limit checks, do the following:
a. Set bandwidth to Full.
b. Set coupling to DC.
c. Press AUTOSET.
d. Close the panel.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 29
Functional checks
30 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
Specifications
These specifications apply to t
he TCA-1MEG High Impedance Buffer
Amplifier when used with Tektronix TekConnect host instruments.
Specifications for the TCA-1M
EG fall into three catego ries: warranted,
typical, and nominal characteristics. Performance Verification
procedures are provided in the Performance verification section for
warranted specifications m
CAUTION. To prevent dam
that are beyond the inpu
Table 3.)
t voltage rating specified for the TCA-1MEG. (See
arkedwiththe
age to the TCA-1MEG, do not apply voltages
symbol.
Table 3: Warranted electrical specifications
Characteristic
Bandwidth
(TCA-1MEG only), at -3dB,
100 mV/division with 50 Ω
termination
Attenuation
Input Capacitance
Input Resistance,
DC Coupled
P6139B Probe tip Bandwidth
with TCA-1MEG, at
100 mV/division
Description
≥500 MHz when used with a Tektronix host
instrument that has ≥1.5 GHz ban dwidth.
100 MHz bandwidth limit ±25%
20 MHz bandwidth limit ±25%
Maximum sensitivity to 10 V/division
in 1-2-5 s equence on a Tektronix host
instrument
10 pF ±2 pF
1MΩ ±1% at DC
1MΩ ±10% at |V
0 MHz with TCA-1MEG connected to
≥50
ktronix 50 Ω host instrument that has
aTe
.5 GHz bandwidth.
≥1
|>50V
in
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 31
Specifications
Table 3: Warranted electrical specifications (cont.)
Input Voltage Rating1(with
TCA-1MEG or a 1X probe)
1
RMS voltage limited to ≤150 V for arbitrary wave shapes including DC. For pulse widths
less than 50 μs, 400 Vpk, <30% Duty Factor. RMS = Root Mean Square = rms = the
square root of the average of the sum of the squares of the instantaneous voltage in one
cycle =
Table 4: Typical elec
trical characteristics
Characteristic
Linear dynamic range
150 V
100 V, CAT II
Description
The lesser of ±5 divisions or the dynamic
range of the TekConnect host instrument
Bandwidth
(TCA-1MEG only)
≥500 MHz when used with a TekConnect
host instrument that has ≥1.5 GHz
bandwidth
100 MHz ±25%
20 MHz ±25%
Linearity
Full-bandwidth small-signal
rise time (TCA-1MEG only)
AC Coupling
(LF 3 dB cutoff frequency)
±0.2%
800 ps calculated from 0.40 / measured
bandwidth
≤10 Hz with TCA-1MEG
≤1 Hz with P6139B probe attached
DC Offset Drift 600 µV/°C or less at output of TCA-1MEG
Displayed system input
offset
±0.2 divisions or less, when used within
±5 °C (±9 °F) of calibrated temperature for
V/division settings ≥10 mV/division
Propagation delay ≤2ns
32 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
Specifications
Figure 16: Typical Input Impedance and Phase versus Frequency
Figure 17: Voltage Derating versus Frequency
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 33
Specifications
Figure 18: TCA-1MEG dimensions
Table 5: Physical characteristics
Characteristic
Unit weight (TCA-1MEG) 5.5 oz (155 g) net
Description
Table 6: Environmental characteristics
Characteristic
g Temperature
Operatin
Humidity
Altitude
Description
+32°Fto+
(0 °C to +
≤80% relative humidity through the
entire operating range
Operating: 9,842 ft (3,000 m)
Nonoperating: 50,000 ft (15,240 m)
122 ° F
50 °C)
34 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
Performance verification
Use the following procedure to
verify that the TCA-1MEG High
Impedance Buffer Amplifier meets the warranted specifications marked
with a
in the Specifications sectio n. (See Table 3 on page 31.)
Perform a probe calibration (a TCA-1MEG calibration) procedure
before performing this test. Refer to Functional checks for the probe
calibration procedure. (S
ee page 13.)
Verify this specification:
TCA-1MEG System Bandwidth
Before beginning this
procedure, photocopy the test record and use it to
record the performance test results. (See Table 8 on page 40.)
The equipment listed
, or a suitable substitute, is required for testing
the TCA-1MEG.
Table 7: Equipment required for performance verification
Description Minimum
requirements
Oscilloscope TCA-1MEG in a
Tektronix TekConnect
Oscilloscope with a
bandwidth ≥1.5 GHz
50 Ω coaxial cable Connects BNC input
of the TCA-IMEG
to the PROBE
COMPENSATION
connection on the
front panel of the host
instrument.
Examples
TDS6000, TDS700 0,
or CSA7000
TekConnect
instruments
Tektronix part number
012-0057-XX
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 35
Performance verification
Table 7: Equipment required for performance verification (cont.)
Leveled sine wave
generator
50 kHz to 500 MHz
±3% amplitude
Wavetek 9500
1
accuracy
50 Ω feedthrough
BNC connectors
termination
1
Wavetek 9500 Oscilloscope Calibrator with two 9510 Output Modules.
Tektronix part number
011-0049-XX
Required software
To ensure compatibility of your TekConnect host instrument with the
TCA-1MEG, your host instrument (for example, TDS6000, TDS7000,
or CSA7000 Series) must hav e the firmware upgrade V2.1.0 or higher.
Upgrade instructions are available on the included CD ROM, or visit
the Tektronix website (www.tek.com) and select the Software and
Drivers link.
NOTE. The test procedure references commands available on a TDS 6604
Oscilloscope. These commands are similar to commands that other
TekConnect host instruments use. If ne eded, refer to the user manual and
online help supplied with your instrument.
36 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
TCA-1MEG system bandwidth
This test verifies t he system bandw id th.
Test equipment hookup. Connect the TCA-1MEG to a channel of the
host instrument. Use a 50 Ω coa
termination to connect the output of the leveled sine wave gener ator to
the in put of the TCA-1MEG. (See Figure 19.)
Figure 19: TCA-1MEG system bandwidth equipment hookup
Performance verification
xial cable and 50 Ω BNC feedthrough
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 37
Performance verification
System bandwidth test procedure. Use t hese instructions for testing the
TCA-1MEG system bandwidth.
1. Set the signal g enerator to a reference frequency of 50 kHz, setting
the initial output level to display a waveform.
2. Push AUTOSET to d isplay a waveform on the host instrument
screen.
3. On the Horiz/Acq menu, select Horizontal/Acquisition Setup, and
then select the A cquisition tab.
a. Set acquisition to Average.
b. Adjust the number of averages to 16.
c. C lose the panel.
4. Use the Trigger area of the front panel to:
a. Set trigger source to the channel where the TCA-1MEG is
connected.
b. Set trigger coupling to DC.
c. Set trigger slope to Positive.
d. Set trigger mode to Auto.
5. On the Measure menu, select Measurement Setup, select
Amplitude, and then select Peak to Peak.
6. On the Vertical menu, select Vertical Setup, choose the tab for the
channel where the TCA-1MEG is connected, and then set vertical
coupling to DC.
7. Use the vertical scale knob to set the channel to 100 mV/division.
8. Perform steps 9 through 13 for each of these vertical bandwidth
settings of the host instrument:
a. Full
b. 100 MHz
c. 20 MHz
38 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
Performance verification
9. On the Vertical Setup panel, set the vertical bandw idth that you are
testing (refer to step 8).
10. Set the horizontal scale to 10 μs/division.
11. On the leveled sine wave generator, do the following:
a. Set the output frequency to 50 kHz.
b. Adjust the output amplitude until the peak-to-peak
measurement displaying on the oscilloscope screen is between
599 mV and 601 mV.
12. On the leveled sine wave generator, set t he output frequency
according to the bandwidth limit you are testing:
a. For bandwidth limit set to Full, set the sine wave generator
to 500 MHz. Set the horizontal scale of the oscilloscope to
5 ns/division. Record the measured value.
b. For bandwidth limit set to 100 MHz, set the sine wave generator
to 75 MHz. Set the horizontal scale of the oscilloscope to
10 ns/division. Record the measured value. Set the sine wave
generator to 125 MHz. Record the measured value.
c. For bandwidth limit set to 20 MHz, set the sine wave generator
to 15 MHz. Set the horizontal scale of the oscilloscope to
20 ns/division. Record the measured value. Set the sine wave
generator to 25 MHz. Record the measured value.
13. Verify that the peak-to-peak m easurement of the oscilloscope meets
the s pecification listed on the TCA-1MEG Test Record - System
bandwidth verification.
NOTE. If the results of these tests do not meet the specifications listed on
the TCA-1MEG test record, contact your Tektronix Service representative.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 39
Performance verification
Use this test record to record the test results of the TCA-1MEG System
Bandwidth tests.
Table 8: TCA-1MEG test record
Instrument serial number: Certificate number:
Temperature: RH %:
Date of calibration: Technician:
Input amplitude (600 mV):
System bandwidth verification
Input voltage
Full (500 MHz)
Specification
≥425 mV
1
p-p
Measured as
100 MHz limit
min. 75 MHz
max. 125 MHz ≤425 mV
≥425 mV
p-p
p-p
20 MHz limit
min. 15 MHz
max. 25 MHz ≤425 mV
1
The 425 mV specification limit is based on a 600 mV input level. -3 dB voltage level =
input voltage x 70.7%, calculated as 425 mV = 600 mV x 0.707
≥425 mV
p-p
p-p
40 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
Replaceable parts
This section contains a list of replaceable parts for the TCA-1MEG
High Impedance Buffer Amplifier. Use this list to identify and order
replacement parts.
Parts ordering i nformation
Replacement parts are available from or through your local Tektronix
service center or representative.
Changes to Tektronix instruments are sometimes made to accommodate
improved components as they become available and to give you the
benefitofthelatestcircuitimprovements. Therefore, when ordering
parts, it is imp ortant to include the following information in your order:
Part number
Instrument type or model number
Instrument serial number
Instrument modification number, if applicable
If a part you order has been replaced with a different or improved part,
your local Tektronix service center or representative will contact you
concerning any c h ange in the part number.
Using the replaceable parts list
The tabular information in the Replaceable Parts List is arranged for
quick retrieval. Understanding the structure and features of the list will
help you find the information you need for ordering replacement parts.
Item names
In the Replaceable Parts List, an Item Name is separated from the
description by a colon (:). Because of space limitations, an Item
Name may sometimes appear as incomplete. For further Item Name
identification, U.S. Federal Catalo gin g Handbo ok H6-1 can be used
where possible.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual 41
Replaceable parts
Abbreviations
Abbreviations conform to American National Standards Institute
(ANSI) standard Y1.1
Figure 20: TCA-1MEG replaceable parts
Table 9: TCA-1MEG replaceable parts
Fig. &
index no.
20–1
20–2 P6139B
20–3 071-1010-XX
20–4 063-3541-XX
20–5 063-3461-XX
Tektronix part
number Name & description
TCA-1MEG TCA-1MEG AMPLIFIER, HIGH IMPEDANCE BUFFER,
1 MEGOHM / 10 PF, TEKPROBE BNC-TO-TEKCONNECT, with
P6139B
P6139B 10X PASSIVE PROBE; STANDARD ACCESSORIES
MANUAL,TECH:INSTRUCTION,TCA-1MEG
SOFTWARE PKG; PRODUCT SOFTWARE, CD, V2.1.0;
TDS6000 SERIES
SOFTWARE PKG; PRODUCT SOFTWARE, CD, V2.1.0;
TDS7000 SERIES
Optional Accessories
—
063-3376-XX
TDS7000 SERIES APPLICATIONS SOFTWARE PKG, PRODUCT
CD
42 TCA-1MEG High Im pedance Buffer Amplifier Instruction Manual
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