ZZZ
xx
TCA-1MEG
High Impedance Buffer Amplifier
Instruction Manual
*P071101002*
071-1010-02
xx
ZZZ
TCA-1MEG
High Impedance Buffer A
mplifier
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.tektronix.com
071-1010-02
Copyright © Tektronix. All rights re
owned by Tektronix or its subsidiaries or suppliers, and are protected by national
copyright laws and international t reaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending.
Information in this publication supersedes that in all previously published
material. Specifications and p
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
served. Licensed software products are
rice change privileges reserved.
Contacting Tektronix
Tektronix, Inc.
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical su pport:
In North America, call 1-800-83 3-920 0.
Worldwide, visit www.tektronix.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 d efective 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 AN D ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHAN
RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE
SOLE AN
BREACH OF THIS WARRANTY. TEKTRONIX AN D ITS VENDORS WILL NOT BE
LIABL
DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADV
[W2 – 15AUG04]
N LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED.
TABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’
D EXCLUSIVE 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 free 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
General Safety Summary ............... ................................ iv
Service Safety Summary................................................ vi
Environmental Considerations ...... .................................. vii
Preface................................................... ................. ix
Getting Started..................... ....................................... 1
Product Description ........................................ ......... 1
Accessories ......................... ................................. 3
Input Voltage Derating ..................................... ......... 3
Probe Calibration for High Accuracy............ .................. 4
Functionality Not Supported ................................. ...... 4
Installation ........... ................................................ 5
Connecting the TCA-1MEG to the Host Instrument ............. 6
Connecting a Probe to the TCA-1MEG ............... ............ 7
Attaching and Grounding a TCA-1MEG System................. 8
Functional Overview................................................ 9
Cleaning............................................................ 10
Functional Checks.................................................. .... 11
Prerequisites ..................... .................................. 11
Required Equipment ........................... ................... 12
Run the SPC (Signal Path Compensation) on the Host
Instrument ................................. ................... 14
Calibrate the TCA-1MEG to the Host Instrument.............. 14
Calibrate the P6139A Passive Voltage Probe t o the TCA-1MEG
and Host Instrument.............. ............................ 16
LF Probe Compensation .. ........................................ 18
Check Vertical Input Coupling .......... ......................... 20
Check Bandwidth Limit ....................... ................... 24
Specifications ............................ ............................... 29
Performance Verification.............................................. . 37
TCA-1MEG System Bandwidth ............................. .... 38
Replaceable Parts. . ... . ... . .. . . ... . ... .. ... . ... . .. . . ... . ... .. ... . ... . .. . 43
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual i
Table of Contents
List of Figures
Figure 1: TCA-1MEG High Impedance Buffer Amplifier............ 1
Figure 2: Connecting and dis
Figure 3: Calibration data message .. ................................... 7
Figure 4: TekConnect and TEKPROBE Interface features . .. ... .. ... 9
Figure 5: Simplified block
Figure 6: Probe Compensation Output of the TDS66 04 . . .. . . .. . .. . 13
Figure 7: Setup with the P6139A attached to the TCA-1MEG . . . .. 18
Figure 8: Probe compen
Figure 9: Test equipm ent hookup for the Vertical Input Coupling and
Bandwidth Limit checks.............................. ............ 20
Figure 10: Typical
Figure 11: Typical waveform at AC Coupling ....................... 22
Figure 12: Typical waveform at DC Coupling....................... 23
Figure 13: Typic
Figure 14: Typical waveform at 100 MHz bandwidth .............. 26
Figure 15: Typical waveform at 20 MHz bandwidth................ 27
Figure 16: Ty
Figure 17: Voltage Derating versus Frequency .......... ............ 32
Figure 18: TCA-1MEG dimensions . ................................. 33
Figure 19: T
Figure 20: TCA-1MEG replaceable parts .. . ... . ... . . . ... . ... . ... . . . . 44
pical Input Impedance and Phase versus Frequency . 31
CA-1MEG System Bandwidth equipment hookup. . . . 38
connecting the TCA-1MEG............ 6
diagram.. ................................. 10
sation waveforms ........................... 19
waveform at GND................................ 21
al waveform at Full (500 MHz) bandwidth .. . ... . 25
ii TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
List of Tables
Table 1: Compatible devices that require high impedance input . . ... 2
Table 2: Required equipment
Table 3: Warranted electrical specifications.......................... 29
Table 4: Typical electrical characteristics ........................ .... 30
Table 5: Physical charact
Table 6: Environmental characteristics ............................... 33
Tab le 7: Cert ifications and compliances.............................. 34
Table 8: Equipment req
Table 9: TCA-1MEG test record...................................... 41
Table 10: TCA-1MEG replaceable parts .. . . . ... . ... . .. ... . ... . . . ... . 44
Table of Contents
................................... ....... 12
eristics ...................... ................ 33
uired for performance verification ......... 37
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual iii
General Safety Summary
General Safety Summary
Review the following safety precautions to avoid injury and prevent
damage to this product or any products connected to it.
To avoid potential hazards, use this product only as specified.
Only qualified personnel should perform service procedures.
To Avoid Fire or Personal Injury
Connect and Disconnect Properly. Connect the probe output to th e
measurement instrument before connecting the p robe to the circuit
under test. Connect th
before connecting the probe inp ut. Disconnect the probe input and the
probe reference lead from the circuit under test before disconnecting
the probe from the me
Ground the Produ ct. This product is indirectly grounded through the
grounding conduc
shock, the grou nding conductor must be connected to earth ground.
Before making connections to the input or output terminals of the
product, ensur
e that the product is pro perly grounded.
e probe reference lead to the circuit und er test
asurement instrument.
tor of the mainframe power cord. To avoid electric
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all
ratings and ma
further ratings information before making connections to the product.
Connect the p
Do Not Operate Without Covers. Do not operate this product with covers
or panels r
Do Not Operate With Suspected Failures. If you suspect that there is
damage to
Avoid Exposed Circuitry. Do not touch exposed connections and
compone
iv TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
rkings on the product. Consult the product manual for
robe reference lead to earth ground only.
emoved.
this product, have it inspected by qu alified service personnel.
nts when power is present.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
General Safety Summary
Provide Prope r Ventilation.
Refer to the manual’s installation instructions
for details on installing the product so it has proper ventilation.
Terms in this Manual
These terms may a ppear 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 tha t cou ld
result in damage t o this p roduct or other property.
Symbols and Terms on the Product
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you
read the marking.
WARNING indicates an injury hazard not immediately accessible
as you read the marking.
CAUTION indicates a hazard to property including the product.
The following symbol(s) may appear on the product:
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual v
Service Safety Summary
Service Safety Summary
Only qualified personnel should perform service procedures. Read
this Service Safety Summary and the General Safety Summary before
performing any service procedures.
Do Not Service Alone. Do not p
of this product unless another person capable of rendering first aid and
resuscitation is present.
Disconnect Power. To avoid electric shock, switch off the instrument
power, then disconnect the power cord from the mains power.
Use Care When Servici
may exist in this product. Disconnect power, remove battery (if
applicable), and disconnect test leads before removing protective panels,
soldering, or rep
To avoid electric shock, do not touch exposed connections.
ng With Power On.
lacing components.
erform internal service o r adjustments
Dangerous voltages or currents
vi TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Environmental Considerations
This section provides informa
the product.
tion about the environmen tal impact of
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 natural resources. The equipment may contain
substances that could be harmful to the environment or human health
if improperly handled at the product’s end of life. In order to avoid
release of such substances into the environm ent and to reduce the use
of natural resources, we encourage you to recycle this product in an
appropriate system that will ensure that most of the materials are reused
or recycled appropriately.
This symbol indicates that this product complies with the
applicable European Union requirements according to
Directives 2002/96/EC and 2006/66/EC on waste electrical and
electronic equipment (WEEE) and batteries. For information
about recycling options, check the Support/Service section of
the Tektronix Web site (www.tektronix.com).
Restriction of Hazardous Substances
This product has been classified as Monitoring and Control equipment,
and is outside the scope of the 2002/95/EC RoHS Directive.
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual vii
Environmental Considerations
viii 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 an d what conventions it uses. Before using this manual or the
TCA-1MEG amplifier, read the G
Safety Summary sections at the beginning of this m anual 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 p rop erly 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 download from the Tektronix Web site.
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.
Manual Conventions
The following conventions are used in this manual:
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual ix
Preface
Safety
Symbols and terms related to safety appear in the Service Safety
Summary found at the beginning of this m anual.
x TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
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) — A C , D C, 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 A m plifier 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 typ e Model Description
Passive voltage
probes
High voltage probes P6015A 20 kV, 1000X, 75 MHz, passive
Micro-volt
differential p
Current probes
Others
1
ine-digit part numbers (xxx-xxxx-xx) are Tektronix part numbers.
N
robe
P6101B 15 MHz, 1X, passive
P6139A 500 MHz, 10X, passive
P5100 2.5 kV, 100X, 250 MHz, passive
P5205
P5210
ADA400A
P6021
P6022
1.3 kV, 100 MHz, active differential
4.4 kV, 50 MHz, active differential
100X / 10X / 1X / 0.1X preamplifier
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
2 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Accessories
The TCA-1MEG amplifier package has a set of standard accessories.
Standard Accessories for the TCA-1MEG
P6139A 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 S eries Product Software (Tektronix part number
063-3541-XX), also available on the Tektronix Web site
TDS7000 S eries Product Software (Tektronix part number
063-3461-XX), also available on the Tektronix Web site
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 Web site. The Tektronix Web site provides
up-to-date firmware and software upgrades.
Getting Started
Input Voltage Derating
The TCA-1MEG is designed to be used in a high voltage environm ent.
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 29,
Specifications.)
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 3
Getting Started
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 ( 41 °F)
from the temperature of the previous calib ration
When you install the TCA-1MEG on a host instrument channel
where it has not been calibrated p reviously
Refer to Functional Checks for the probe calibration procedure. (See
page 11, Functional Checks.)
Probes or adapters with the following characteristics will not calibrate
using the internal calibration signal of the TekConnect host instrument:
Probes or adapters without TEKPROBE readout capabilities
Probes with attenuation levels greater than 20X, due to the low
signal level at the output of the internal calibration generator
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 your applications,
use a Tektronix TekConnect 50 Ω adapter (TCA-BNC, TCA-SMA, or
TCA-N) in place of the TCA-1MEG. When the host instrument 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 T CA-1MEG is not compatible for use with
nonTektronix probes, cables, and adapters that have readout o r power
connection pins.
4 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
CAUTION. To avoid damage to your equipment, do not use the TCA-1MEG
with nonTektronix probes, cables, and adapters that ha ve readout or power
connection pins.
Installation
The TCA-1MEG connects directly to the TekConnect interface on the
TekConnect host instrume
Firmware Requirements
Getting Started
nt.
To ensure compatibili
TCA-1MEG, your host instrument (for example, TDS6 000 , 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 instrument.
Firmware upgrade instructions are available on the CD ROMs included
with the TCA-1MEG. The upgrades are also available on the Tektronix
Web site at www.tektronix.com. Select the Software & Drivers link
on the home page of the Web site. The Tektronix Web site provides
up-to-date software and firmware upgrades.
ty of your TekConnect host instrument with the
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 5
Getting Started
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 from the host instrument, grasp the unit,
depress the latch button, and pull it o ut of the TekConnect receptacle.
Figure 2: Conn
NOTE. If you connect the TCA-1MEG to a channel where it has already
been probe calibrated, a message may appear on the display screen. (See
Figure 3 on page 7.) Follow the instructions on the message.
6 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
ecting and disconnecting the TCA-1MEG
Getting Started
Figure 3: Calibration da
ta message
Connecting a Probe to the TCA-1MEG
WARNING. To av oid fire or personal injury, connect the TCA-1MEG
amplifier to the host instrument, then connect the p robe 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 you connect a probe or other device, ensure that the device is
compatible with t he TCA-1M E G. Refer to Functionality Not Supported.
(See page 1, 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.
ecting the TCA-1MEG from the host instrument, disconnect
er input device, and the probe ground, from the
-test, an d then disconnect the probe or other input device from
amplifier.
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 7
Getting Started
Before connecting a probe or other device to the TCA-1MEG, always
refer to the list of compatible devices. (See Table 1 on page 2.)
Attaching and Grounding a TCA-1MEG System
Always use these procedures for safely connecting and disconnecting
the TCA-1MEG and prob e to the circuit under test.
WARNING. To a v o id fire or personal injury, connect the TCA-1MEG and
probe output to the measurement instrument before connecting the probe or
other input de vice 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, connect the ground lead of the pro be to the
ground of the circ
Be careful that no part of the ground lead or probe grounding ring
contacts voltag
BNC center conductor, all accessible m etal (including the ground clip)
is connected to the BNC outer shell and is considered earth ground.
uit under test before taking any measurements.
e in the circuit und er test. Except for the probe tip and
8 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Functional Overview
The 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 hos t 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.
Getting Started
Figure 4: TekConnect and TEKPROBE Interface features
When the TCA-1MEG is connected to the host instrument, the
input of the host instrument is set to 1 MΩ.IftheTCA-1MEG
was previou
coupling and bandwidth limit are set to the settings previously used.
If the TCA-1MEG has never been connected to the host instrument
channel, t
TCA-1MEG settings (DC coupling and Full bandwidth).
When a pro
reads its attenuation factor and displays readouts adjusted for the
attenuation factor of the pro be. The host instru ment controls offset if
the con
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 9
sly connected to the host instrument channel, the input
he input coupling and bandwidth limit are set to the default
be is connected to the TCA-1MEG, the host instrument
nected probe requires it.
Getting Started
Operating Characteristics
Although the TCA-1MEG amplifier 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
Follow these gui
General Care. Do not u se chemical cleaning agents. Avoid using
chemicals that contain acetone, benzene, toluene, xylene, or similar
solvents because they may dam age 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 cleanin g in narrow
spaces around the TekConnect release button and connectors. Do not
use abrasive compounds on an y part of the instrument.
CAUTION. To avoid permanent damage to the TCA-1MEG while cleaning,
use only en ough solution to dampen the cloth or swab. The TCA-1MEG is
not waterproof.
10 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
delines for cleaning the TCA-1MEG amplifier.
Functional Checks
The purpose of these procedure
High Impedance Buffer Amplifier functions properly w ith the host
instrument.
The following functions are checked:
Probe LF 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 ma nual and online help for detailed operating information.
Prerequisites
The conditions listed below must be met in the following order b efore
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.)
sistoconfirm that the T CA- 1M E G
3. The TCA-1MEG calib ration procedure must be performed. Refer
to Calibrate the TCA-1MEG to the Host Instrument. (Seepage14.)
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 11
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, nonterminated
Recommended
example
CSA7000
Tektronix part number
103-0226-XX
Tektronix part number
012-0117-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 instructio ns are available on the included CD ROM, or visit ou r
website at www.tek.com and select the So ftwa re and Drivers link. The
Tektronix Web site provides up-to-date firmware and software upgrades.
TCA-1MEG Readings on the Host Instrument
The TCA-1MEG readings on the host instrument display screen may
vary from instrument to instrument.
The output am plitu de and frequency shown for the TCA-1MEG is
dependent on the probe compensation output of the TekConnect host
instrument. The output amplitude, frequency, an d voltage offset of
the host instrument is shown next to the Probe Com pensation output
connector. (See Figure 6.)
12 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Functional Checks
Figure 6: Probe Compensa
NOTE. Unless specifically directed, do not terminate the probe
compensation output o f 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 p rocedures use some of the commands available on a
TDS6604 Oscilloscope. These commands are similar to th e 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 wh ile
testing:
1. On the display screen, choose
Buttons display.
2. On the front panel, activate
Touch Screen.
3. On the Vertical menu, select
Vertical Setup. A tabbed pa nel
of Vertical options displays
across the bottom of the
screen.
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 13
Functional Checks
Run the SPC (Signal Path Compensation) on the Host
Instrument
You must run the SPC on the host instrument before you calibrate the
TCA-1MEG to your host instrument. Do the following:
1. Warm up the instrument for 20 minutes.
2. From the Utilities menu, select I nstr ument Calibration.
3. In the Calibration 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 bu tton.
5. When the Status field is Pass, proceed to the Calibrate the
TCA-1MEG to the Host I nstrument procedure.
Calibrate the TCA-1M EG to the Host Instr um ent
You must perform a calibration of the TCA-1MEG to your ho st
instrument before you perform the functional ch ecks. 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-1ME G and/or probe to the
host instrument (allow a 20 minute w arm-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 procedure only calibrates the TCA-1ME G to the TekConnect host
instrument. If you intend to use a probe with the TCA-1MEG, you must
also perform the Calibrate the P6139A Passive Voltage Probe to th e
TCA-1MEG and Host Instrument procedure. (See page 16.)
14 TCA-1MEG High Impedance 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 that the T CA-1MEG is connected to.
3. Choose Calibrate Probe. This operation may take several minutes.
Do not remove the TCA-1MEG or cable during this operation.
4. When probe calibration is co mp lete, the Prob e Status field should
read Pass.Ifthefield reads Fail, contact your Tektronix Service
representative.
NOTE. For Volts/division settings≥10 mV/division, the typical Displayed
System Input Offset is ±0.2 divisions or less, when used within ±5 °C of
the calibrated temperature.
5. Close the probe calibration p anel.
The TCA-1MEG is now calibrated to the host instrument for the
specified channel only. If yo u move the TCA-1MEG to ano ther
channel or to another host instrument, you must repeat this
procedure.
6. Proceed to the functional checks.
If you attach a probe to the TCA-1M E G, you mu st perform th e
Calibrate the P6139A Passive Voltage Probe to the TCA-1MEG and
Host Instrument procedure that follows.
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 15
Functional Checks
Calibrate the P6139A Passive Voltage Probe to the
TCA-1MEG and Host Instrument
A P6139A probe and an instrument calibration connection ( or suitable
equivalent) are required for this procedure.
NOTE. Variations in the characteristics of the TCA-1MEG a nd/or probe
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 amplitude differences between the leading and trailing edges,
perform the LF Probe Compensation procedure to optimize low-frequency
compensation. (See page 18.)
Tes t Equipment H
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 nonter
probe to the probe calibration signal on the front panel of the host
instrument.
4. Check for proper LF compensation: If a 1 kHz calibrated square
wave displayed at 1 ms/division shows significant amplitude
differenc
LF Probe Compensation procedure to optimize low-frequency
compensation. (See page 18.)
ookup.
minated probe tip-to-BNC adapter, connect the
es between the leading and trailing edges, perform the
16 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Functional Checks
Test Procedure.
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 that the TCA-1MEG and/or probe are
connected to.
3. Choose Calibrate Probe. This operation may take several minutes.
Do not remove the TCA-1MEG or probe during this operation.
4. When probe calibration is co mp lete, the Prob e Status field should
read Pass.Ifthefield reads Fail, contact your Tektronix Service
representative.
NOTE. For Volts/division settings≥10 mV/division, the typical Displayed
System Input Offset is ±0.2 divisions or less, when used within ±5 °C of
the calibrated temperature.
5. Close the probe calibration p anel.
The TCA-1MEG and probe are now calibrated to the host instrument
for the specified channel only. If you m ove the TCA-1MEG and probe
to another channel or to another host instrument, you must repeat the
TCA-1MEG and probe calibration procedures.
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 17
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 adap ter, connect the pro be to the
probe calibration signal on the front panel of the oscilloscope.
NOTE. After connecting the TCA-1MEG to the host instrument, allow them
to warm up for at least twenty minutes before performing the functional
checks.
Figure 7: Setup with the P6139A attached to the TCA-1MEG
4. Press AUTOSET or otherwise adjust your host instrument to
display a meaningful waveform.
18 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Functional Checks
5. On the Vertical menu, select Vertical Setup, and then choose the tab
of the channel that the TCA-1M EG is connected to.
a. Set coupling to DC. Set trigger level to 50%.
b. Set bandwidth to Full.
c. Set vertical scale to 100 mV/division.
d. Setoffsetto1.6.
e. Adjust vertical positio n 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 Ho rizontal/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 the 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 A m plifier Instruction Manual 19
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 th e front panel of the host instrument, press the button
corresponding to the channel that the TCA-1MEG is connected to.
2. Push the AUTOSET button to display a waveform on the screen.
3. If autoset
manually change vertical V/division to 500 mV.
4. Using the
two divisions above center screen.
5. On the Ve
of the channel that the TCA-1MEG is connected to.
6. Set cou
The resulting waveform should appear as shown. (See Figure 10
on pa
20 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
does not set the host instrument to 500 mV/division,
Vertical Position control knob, position the waveform to
rtical menu, select Vertical Setup, and then choose the tab
pling to GND.
ge 21.)
Figure 10: Typical waveform at GND
Functional Checks
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 21
Functional Checks
7. Set Coupling to AC, and set trigger level to 50%. The resulting
waveform should appear as shown. (See Figure 11.)
Figure 11: Typi
22 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
cal waveform at AC Coupling
Functional Checks
8. Set Coupling to DC, and set trigger level t o 50%. The resulting
waveform should appear as shown. (See Figure 12.)
Figure 12: Typ
ical waveform at D C Coupling
9. Leave the Coup
ling set to DC.
10. Close the panel.
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 23
Functional Checks
Check Bandwidth Limit
Verify bandwidth limits at full, 100 MHz, and 20 MHz.
Test Equipment Hookup. Use the same hardware configuration as t he
Vertical Input Coupling chec
Test Procedure. Do the following :
1. On the front panel of the host instrument, select the channel that
the TCA-1MEG is connected to.
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 that the TCA-1MEG is connected to.
a. Set coupling to AC.
b. Set bandwidt h to Full (500 MH z) .
5. Set to trigger at 50%.
6. Set the horizontal position of the leading edge to the left of center
screen.
k. (See Figure 9 on page 20.)
NOTE. When full bandwidth is set, overshoot and ringing on the signal is
normal and does not indicate p roblems with the TCA-1MEG.
The resulting waveform should appear as shown. (See Figure 13.)
24 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Figure 13: Typical waveform at Full (500 MHz) bandwidth
Functional Checks
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 25
Functional Checks
7. Set bandwidth to 100 MHz.
NOTE. When 100 MHz bandwidth is set, the signal risetime increases and
overshoot and ringing decreases.
The resulting waveform should appear as shown. (See Figure 14.)
Figure 14: Typical waveform at 100 MHz bandwidth
26 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Functional Checks
8. Set bandwidth to 20 MHz.
NOTE. When the 20 MHz bandwidth limit is set, signal risetime is ne ar
15 ns.
The resulting waveform should appear as shown. (See Figure 15.)
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 A m plifier Instruction Manual 27
Functional Checks
28 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Specifications
These specifications apply to t
Amplifier when used with Tektronix TekConnect host instruments.
Specifications for the TCA-1M
typical, and nominal characteristics. Perfo rm ance Verification
procedures are provided in the Performance Verification section for
warranted specifications m
Specifications
CAUTION. To prevent damage to the TCA-1MEG, do not apply voltages
that are beyond the input voltage rating specified for the TCA-1MEG. (See
Table 3.)
Table 3: Warranted electrical specifications
Characteristic
Bandwidth
(TCA-1MEG onl
100 mV/divis
termination
Attenuation
Input Capa citance
Input Resistance, DC
Coupled
P6139A Probe tip Bandwidth
with TCA-1MEG, at
100 mV/division
y), at -3dB,
ion with 50 Ω
he TCA-1MEG High Impedance Buffer
EG fall into three categories: warranted,
arkedwiththe
Description
≥500 MHz when used with a Tektronix host
instrument that has ≥1.5 GHz bandwidth.
100 MHz bandwidth limit ±25%
20 MHz bandwidth limit ±25 %
Maximum sensitivity to 10 V/division
in 1-2-5 sequence on a Tektronix host
instrument
10 pF ±2 pF
1MΩ ±1% at DC
1MΩ ±10% at |V
≥500 MHz with TCA-1MEG connect ed to
a Tektronix 50 Ω host instrument that ha s
≥1.5 GHz bandwidth.
symbol.
|>50V
in
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 29
Specifications
Table 3: Warranted electrical specifications (cont.)
Input Voltage Rating1(with
150 V, CAT 1
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 electrical characteristics
Characteristic
Linear dynamic range
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%
y
Linearit
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 P6139A 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 of calibrated tem perature for
V/division settings ≥10 mV/division
Propagation D elay ≤2ns
30 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Specifications
Figure 16: Typica
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 31
l Input Impedance and Phase versus Frequency
Specifications
Figure 17: Voltage
Derating versus F requency
32 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Figure 18: TCA-1MEG dimensions
Specifications
Table 5: Physical ch
Characteristic
Unit weight (TCA-1MEG) 5.5 oz (155 g) net
aracteristics
Description
Table 6: Environmental characteristics
Characteristic
Operating Temperature + 32 ° F to + 122 ° F
Humidity
Altitude
Description
(0 °C to + 50 °C)
≤80% relative humidity through the
entire operating range
Operating: 9,842 ft (3,000 m)
Nonoperating: 50,000 ft (15,240 m)
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 33
Specifications
Table 7: C ertifications and compliances
Category Standards or description
EC Declaration of
Conformity - Low
Voltage
U.S. Nationally
Recognized Testing
Laboratory Listing
Canadian
Certificatio
Additional
Compliance
Installation
(Overvoltage)
Category
Descriptions
Compliance was demonstrated to the following
specification as listed in the Official Journal of the
European Communities:
Low Voltage Directive 73/23/EEC, amended by
93/68/EEC
EN 61010-1/A2:1995 Safety requirements fo r
electrical equipment for measurement, control, a nd
laboratory use.
UL3111-1 Standard for electrical measuring and test
equipment.
CAN/CSA C22.2
n
electrical e
laboratory
ISA S 82.02.01:1999 Safety standard for electrical
and electronic test, measuring, contro lling, and
related equipment.
IEC61010-1/A2:1995 Safety requirements for
electrical equipment for measurement, control, a nd
laboratory use.
Terminals on this product may have different
installation (overvoltage) category designations. The
installation ca tegories are:
CAT III Distribution-level mains (usually permanently
connected). Equipment at this level is typically in a
fixed industrial location.
CAT II Local-level mains (wall sockets). Equipment
at this level includes appliances, portable tools,
and similar products. Equipment is usually
cord-connected.
CAT I Secondary (signal level) or battery o pera ted
circuits of electronic equipment.
No. 1010.1 Safety requirements for
quipment for measurement, control, and
use.
34 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Specifications
Tab le 7 : Certifications and com pliances (cont.)
Category Standards or description
Pollution Degree
Descriptions
Equipment Type Test and measuring
Safety Class Class 1 (as defined in IEC 61010-1, Annex H) -
Pollution Degree
A measure of the contaminates that could occur
in the environment around and within a product.
Typically the internal environment 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 onl
occurs. Prod ucts
encapsulated, h
clean rooms.
Pollution Degree 2
Normally only dry, nonconductive po llution
occurs. Occasionally a temporary conductivity
that is caused by condensation must be
expected. This location is a typical office/home
environment. Temporary condensation occurs
only when the product is out 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 dire ct
sunshine, rain, or direct wind.
lution Degree 4
Pol
llution that generates persistent conductivity
Po
rough conductive dust, rain, or snow. Typical
th
utdoor locations.
o
grounded product
Pollution Degree 2 (as defined in IEC 61010-1).
Note: Rated for indoor use only.
y dry, nonconductive pollution
in this category are generally
ermetically sealed, or located in
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 35
Specifications
36 TCA-1MEG High Impedance 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 section. (See Table 3 on page 29.)
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 11.)
Verify this specificatio n:
TCA-1MEG System Bandwidth
Before beginning this
procedure, photocopy the test record and use it to
record the performance test results. (See Table 9 on page 41.)
The equipment listed
, or a suitable substitute, is required for testing
the TCA-1MEG.
Table 8: 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.
Leveled sine wave
generator
50 Ω feedthrough
termination
1
Wavetek 9500 Oscilloscope Calibrator with two 9510 Output Modules.
50 kHz to 500 MHz
±3% amplitude
accuracy
BNC connect ors
Examples
TDS6000, TDS7000,
or CSA7000
TekConnect
instruments
Tektronix part number
012-0057-XX
Wavetek 9500
Tektronix part number
011-0049-XX
1
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 37
Performance Verification
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 have the firm ware upgrade V2 .1.0 or higher.
Upgrade instructions are available on the included CD ROM, or visit
our Web site at www.tek.com and select the Software and Drivers link.
NOTE. The test procedure references commands available on a TDS6604
Oscilloscope. These commands are similar to commands that other
TekConnect host instruments use. If needed, refer to the user manual and
online help supplied with your instrument.
TCA-1MEG System Bandwidth
This test verifies the
Test Equipment Hookup. Connect the TCA-1MEG to a channel of the
host instrument. Use a 50 Ω coaxial cable and 50 Ω BNC feedthrough
termination to connect the outpu t of the leveled sine wave generator to
the input of the TCA-1MEG . (See Figure 19.)
Figure 1
9: TCA-1MEG System Bandwidth equipment hookup
system bandwidth.
38 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Performance Verification
System Bandwid th Test Procedure. Use these instructions for testing the
TCA-1MEG system bandwidth.
1. Set the signal generator to a reference frequency of 50 kHz, setting
the initial output level to display a waveform.
2. Push AUTOSET to display a waveform on the host instrument
screen.
3. On the Horiz/Acq menu, select Ho rizontal/Acquisition Setup, and
then select the Acquisition tab.
a. Set acquisition to Average.
b. Adjust the number of averages to 16.
c. Close 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
couplingtoDC.
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 instru ment:
a. Full
b. 100 MHz
c. 20 MHz
9. On the Vertical Setup panel, set the vertical bandwidth that you are
testing (refer to s tep 8, above).
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 39
Performance Verification
10. Set the horizontal scale to 10 μs/division.
11. On the leveled sine wav e generator, do th e 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 the 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 10 0 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 measurement of the oscilloscope meets
the specification listed on the TCA-1MEG Test Recor d - Syst em
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.
40 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Performance Verification
Use this test record to record the test results of the TCA-1MEG System
Bandwidth tests.
Table 9: TCA-1MEG test record
Instrument serial number: Certificate nu m ber:
Temperature: RH %:
Date of calibration: Technician:
Input a mplitude (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
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 41
Performance Verification
42 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Replaceable Parts
This section contains a list of replaceable parts for the TCA-1MEG
High Impedance Buffer Amplifier. Use this li st to identify and order
replacement parts.
Parts Ordering Information
Replacement parts are available from or through your local Tektronix,
Inc. 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 important 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 change in the part number.
Using the Replaceable Parts List
The tabular information in the Replaceable Parts L ist 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 R eplaceable 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 Cataloging Handbook H6-1 can be used
where possible.
TCA-1MEG High Impedance Buffer A m plifier Instruction Manual 43
Replaceable Parts
Abbreviations
Abbreviations conform to American National Standards Institute
(ANSI) standard Y1.1
Figure 20: TCA-1MEG replaceable parts
Table 10: TCA-1MEG replaceable parts
Fig. &
index
no.
20–1
20–2 P6139A
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 P6139A
P6139A 10X PASSIVE PROBE; STANDARD
ACCESSORIES
MANUAL,TECH:INSTRUCTION,TCA-1MEG
SOFTWARE PKG; PRODUCT SOFTWARE, CD,
V2.1.0; TDS6000 SERIES
FTWARE PKG; PRODUCT SOFTWARE, CD,
SO
2.1.0; TDS7000 SERIES
V
Optional Accessories
063-3376-XX
TDS7000 SERIES APPLICATIONS SOFTWARE
PKG, PRODUCT CD
44 TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
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