Instruction Manual
TCA
-1MEG
High Impedance Buffer Amplifier
071-1010-01
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
Copyright © Tektronix, Inc. All rights reserved. Licensed software products
are owned by Tektronix or its subsidiaries or suppliers, and are protected by
national copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and
pending. Information in this publication supercedes that in all previously
published material. Specifications and price change privileges reserved.
TEKTRONIX and TEK are registered tradem arks of Tektronix, Inc.
Contacting Tektronix
Tektronix, Inc.
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
H In North America, call 1-800-833-9200.
H Worldwide, visit www.tektronix.com to find contacts in your area.
Warranty 2
Tektronix warrants that this product will be free from defects in materials and
workmanship for a period of one (1) year from the date of shipment. If any such product
proves defective during this warranty period, Tektronix, at its option, either will repair the
defective product without charge for parts and labor, or will provide a replacement in
exchange for the defective product. Parts, modules and replacement products used by
Tektronix for warranty work may be new or reconditioned to like new performance. All
replaced parts, modules and products become the property of Tektronix.
In order to obtain service under this warranty, Customer must notify Tektronix of the
defect before the expiration of the warranty period and make suitable arrangements for the
performance of service. Customer shall be responsible for packaging and shipping the
defective product to the service center designated by Tektronix, with shipping charges
prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to
a location within the country in which the Tektronix service center is located. Customer
shall be responsible for paying all shipping charges, duties, taxes, and any other charges for
products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or
improper or inadequate 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 IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED.
TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE
PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE
CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS
VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX
OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES.
Table of Contents
General Safety Summary v..............................
Service Safety Summary vii..............................
Environmental Considerations ix.........................
Preface xi............................................
Manual Structure xi....................................
Manual Conventions xii.................................
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 6........
Connecting a Probe to the TCA-1MEG 8..................
Attaching and Grounding a TCA-1MEG System 9...........
Functional Overview 10.................................
Cleaning 12...........................................
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 P6139A Passive Volt age Probe to the
TCA-1MEG and Host Instrument 18....................
LF Probe Compensation 20..............................
Check Vertical Input Coupling 23.........................
Check Bandwidth Limit 27..............................
Specifications 31......................................
Performance Verification 41............................
TCA-1MEG System Bandwidth 42........................
Replaceable Parts 47...................................
Parts Ordering Information 47............................
Using the Replaceable Parts List 48........................
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
i
Table of Contents
List of Figures
Figure 1: TCA-1MEG High Impedance Buffer Amplifier 1....
Figure 2: Connecting and disconnecting the TCA-1MEG 7....
Figure 3: Calibration data message 7......................
Figure 4: TekConnect and TEKPROBE Interface features 10....
Figure 5: Simplified block diagram 11.....................
Figure 6: Probe Compensation Output of the TDS6604 15......
Figure 7: Setup with the P6139A attached to the TCA-1MEG 21
Figure 8: Probe compensation waveforms 22................
Figure 9: Test equipment hookup for the Vertical
Input Coupling and Bandwidth Limit checks 23...........
Figure 10: Typical waveform at GND 24....................
Figure 11: Typical waveform at AC Coupling 25.............
Figure 12: Typical waveform at DC Coupling 26.............
Figure 13: Typical waveform at Full (500 MHz) bandwidth 28..
Figure 14: Typical waveform at 100 MHz bandwidth 29.......
Figure 15: Typical waveform at 20 MHz bandwidth 30........
Figure 16: Typical Input Impedance and Phase
versus Frequency 33.................................
Figure 17: Voltage Derating versus Frequency 34.............
Figure 18: TCA-1MEG dimensions 35.....................
Figure 19: TCA-1MEG System Bandwidth equipment hookup 42
Figure 20: TCA-1MEG replaceable parts 50.................
Figure 21: TCA-1MEG optional accessories 52..............
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 14..........................
Table 3: Warranted electrical specifications 31..............
Table 4: Typical electrical characteristics 32................
Table 5: Physical characteristics 35.......................
Table 6: Environmental characteristics 35..................
Table 7: Certifications and compliances 36.................
Table 8: Equipment required for performance verification 41...
Table of Contents
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
iii
Table of Contents
iv
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
General Safety Summary
Review the following safety precautions to avoid injury and prevent
damage to this product or any products connected to it. To avoid
potential hazards, use this product only as specified.
Only qualified personnel should perform service procedures.
To Avoid Fire or Personal Injury
Connect and Disconnect Properly. 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 disconnecting the TCA-1MEG from the host instrument,
disconnect the probe or other input device, and the probe ground,
from the device-under-test, and then disconnect the probe or other
input device from the TCA-1MEG amplifier.
Ground the Product. This product is indirectly grounded through the
grounding conductor of the host instrument 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, ensure that the product is properly grounded.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all
ratings and markings on the product. Consult the product manual for
further ratings information before making connections to the product.
The common terminal is at ground potential. Do not connect the
common terminal to elevated voltages.
Connect the ground lead of the probe to earth ground only.
Do Not Operate With Suspected Failures. If you suspect there is damage
to this product, have it inspected by qualified service personnel.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
v
General Safety Summary
Provide Proper Ventilation. Refer to the manual’s installation
instructions for details on installing the product so it has proper
ventilation.
Safety Terms and Symbols
Terms in This Manual. These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that
could result in injury or loss of life.
CAUTION. Caution statements identify c onditions or practices that
could result in damage to this product or other property.
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.
Symbols on the Product. These symbols may appear on the product:
CAUTION
Refer to Manual
vi
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
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 perform internal service or adjustments
of this product or host instrument unless another person capable of
rendering first aid and resuscitation is present.
Disconnect Power. To avoid electric shock, switch off the host
instrument power, then disconnect the host instrument power cord
from the mains power.
Use Care When Servicing with Power On. Dangerous voltages or currents
may exist in this product and host instrument. Disconnect power,
remove battery (if applicable), and disconnect test leads before
removing protective panels, soldering, or replacing components.
To avoid electric shock, do not touch exposed connections.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
vii
Service Safety Summary
viii
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Environmental Considerations
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 environment and to reduce the use
of natural resources, we encourage you to recycle this product in an
appropriate system that will ensure that most of the materials are
reused or recycled appropriately.
The symbol shown to the left indicates that this
product complies with the European Union’s
requirements according to Directive 2002/96/EC
on waste electrical and electronic equipment
(WEEE). 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. This product is known to contain lead, cadmium, mercury,
and hexavalent chromium.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
ix
Environmental Considerations
x
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Preface
This is the Instruction manual for the TCA-1MEG High Impedance
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 Gene ral Safety Summary and
Service 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:
H Getting Started includes a product description, list of accessories,
and instructions for installation.
H Functional Checks includes procedures for verifying that the
TCA-1MEG functions properly with a host instrument.
H Specifications includes warranted electrical specifications, typical
electrical characteristics, and graphs for typical input impedance,
and typical bandwidth.
H Performance Verification includes a procedure for verifying
warranted electrical specifications.
NOTE. Service software for this instrument is included on the
TDS Applications CD ROM (Tektronix part number 063--3376--XX)
for your host instrument, and is also available for download from the
Tektronix Web site.
Be sure to read the introductory text for each procedure. These
introductions 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
xi
Preface
Manual Conventions
The following conventions are used in this manual:
Safety
Symbols and terms related to safety appear in the Service Saf ety
Summary found at the beginning of this manual.
xii
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:
H Input impedance — 1 MΩ,10pF
H Bandwidth — 500 MHz
H Bandwidth limit (selectable) — Full (500 MHz), 100 MHz,
and20MHz
H Input coupling (selectable) — AC, DC, and GND
H Input Connection—1MΩ 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
Table 1 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 P6101B 15 MHz, 1X, passive
High voltage probes P6015A 20 kV, 1000X, 75 MHz,
P6139A 500 MHz, 10X, passive
passive
P5100 2.5 kV, 100X, 250 MHz,
passive
P5205 1.3 kV, 100 MHz, active
differential
P5210 4.4 kV, 50 MHz, active
differential
Micro-volt differential probe ADA400A 100X / 10X / 1X / 0.1X
preamplifier
Current probes P6021 AC, 15 A
P6022 AC, 6 A
,60MHz
p-- p
, 120 MHz
p-- p
AM503S AC/DC current amplifier
measurement system
Others Tektronix
part number
50 Ω BNC-to-BNC coaxial
cable
012--0057--01
Tektronix
part number
50 Ω feed through termination
011--0049--02
Tektronix
part number
50 Ω BNC-to-BNC coaxial
cable, male to male
012--0482--00
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
H P6139A 10X Passive Probe with standard accessories and
Instructions
H Certificate of Traceable Calibration
H TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
(Tektronix part number 071-1010-XX)
H TDS6000 Series Product Software (Tektronix part number
063-3541-XX), also available on the Tektronix Web site
H TDS7000 Series 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 CDfor 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 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 Table 3 on page 31 of the
Specifications section for input voltage rating, and Figure 17 on
page 34 for voltage versus frequency derating information.
Probe Calibration for High Accuracy
To ensure high accuracy, a probe calibration routine is recommended
for the TCA-1MEG:
H When the ambient temperature changes by more than 5
°F) from the temperature of the previous calibration
(41
H When you install the TCA-1MEG on a host instrument channel
where it has not been calibrated previously
Refertopage16oftheFunctional Checks section for the probe
calibration procedure.
Probes or adapters with the following characteristics will not
calibrate using the internal calibration signal of the TekConnect host
instrument:
H Probes or adapters without TEKPROBE readout capabilities
H Probes with attenuation levels greater than 20X, due to the low
signal level at the output of the internal calibration generator
°C
4
TCA-1MEG High Impedance Buffer Amplifier 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 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 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
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
website provides up-to-date software and firmware upgrades.
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 on page 7.
To release the TCA-1MEG from the host instrument, grasp the unit,
depress the latch button, and pull it out of the TekConnect receptacle.
6
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Getting Started
Latch button
Figure 2: Connecting and disconnecting the TCA-1MEG
NOTE. If you connect the TCA-1MEG to a channel where it has
already been probe calibrated, a message similar to the one shown in
Figure 3, below, may appear on the display screen. Follow the
instructions on the message.
Figure 3: Calibration data message
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
7
Getting Started
Connecting a Probe to the TCA-1MEG
Before you connect a probe or other device, ensure that the device is
compatible with the TCA-1MEG. Refer to Functionality Not
Supported on page 5 of the Getting Started section.
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 other device to the TCA-1MEG, always
refer to the list of compatible devices in Table 1 on page 2.
8
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Attaching and Grounding a TCA-1MEG System
Always use these procedures for safely connecting and disconnecting the TCA-1MEG 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, connect 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 grounding 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.
Getting Started
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
9
Getting Started
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 host instrument. Power, signal, offset,
and probe characteristic data transfer through the interface to the host
instrument. Refer to Figure 4, below, for TekConnect and
TEKPROBE interface features. Also, refer to your oscilloscope or
probe documentation for more detailed specifications.
TekConnect interface TEKPROBE interface (1 MEG)
Latch button
Latch
TekConnect
interface
contacts
Signal
Ground
1
2
3
4
DATA
CLOCK
+5 V
+15 V
GND
SIGNAL
--15 V
-- 5 V
OFFSET 1 V
7
6
5
10
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. If the TCA-1MEG was
previously connected to the host instrument channel, the input
coupling and bandwidth limit are set to the settings previously used.
If the TCA-1MEG has never been connected to the host instrument
channel, the input coupling and bandwidth 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
attenuation factor of the probe. The host instrument controls offset if
the connected probe requires it.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
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 Figure 5 for a simplified
block diagram of the amplifier.
GND
AC
DC
50 Ω
TekConnect
interface
TEKPROBE
interface
Attenuator
network
Bandwidth select
TEKPROBE power and communication
Figure 5: Simplified block diagram
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
11
Getting Started
Cleaning
Follow these guidelines for cleaning the TCA-1MEG amplifier.
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 abrasive compounds on any part of 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.
12
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Functional Checks
The purpose of these procedures is to confirm that the TCA-1MEG
High Impedance Buffer Amplifier functions properly with the host
instrument.
The following functions are checked:
H Probe LF Compensation
H Verti cal Input Coupli ng
H 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 conditions 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 be performed. Refer
to Calibrate the TCA-1MEG to the Host Instrument on page 16 of
this section.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
13
Functional Checks
Required Equipment
The required equipment is listed in Table 2.
Table 2: Required equipment
Description Performance requirement Recommended example
Oscilloscope TekConnect interface TDS6000, TDS7000,
Cable 50 Ω coaxial, male-to-male Tektronix part number
Probe tip adapter BNC, nonterminated Tektronix part number
1
See Required Oscilloscope Firmware Version below
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 available on the included CD ROM,
or visit our website at www.tek.com and select the Software and
Drivers link. The Tektronix Web site provides up-to-date firmware
and software upgrades.
CSA7000
103-0226-XX
012-0117-XX
1
14
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 amplitude and frequency shown for the TCA-1MEG is
dependent on the probe compensation output of the TekConnect host
instrument. The output amplitude, frequency, and voltage offset of
the host instrument is shown next to the Probe Compensation output
connector (see Figure 6 on page 15).
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
PROBE COMPENSATION
Functional Checks
1.0V
0.8V 1khz
INTO 50Ω
ADJUST PROBE
AT 1 m s
Figure 6: Probe Compensation Output of the TDS6604
NOTE. Unless specifically directed, do not terminate the probe
compensation output of the host instrument or the TCA-1MEG input
witha50Ω feedthrough terminator.
Reference Commands on the Host Instrument
The following test procedures use some 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 quicksetting changes while testing:
2.0V
1.6V
INTO 1M
1khz
Ω
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 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 cali brate the
TCA-1MEG to your host instrument. Do the following:
1. Warm up the instrument for 20 minutes.
2. From the Utilities menu, select Instrument 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 button.
5. When the Status field is Pass,proceedtotheCalibrate the
TCA-1MEG to the Host Instrument procedure.
Calibrate the TCA-1MEG to the Host Instrument
You must perform a calibration of the TCA-1MEG to your host
instrument before you perform the functional checks. A BNC-toBNC 50 Ω coaxial cable (or suitable equivalent) is required for this
procedure.
16
Perform the TCA-1MEG calibration routine:
H The first time that you connect the TCA-1MEG and/or probe to
the host instrument (allow a 20 minute warm-up period).
H If you move the TCA-1MEG and/or probe to a new channel or
host instrument.
H If the host instrument, TCA-1MEG or probe have had an SPC,
repair, or calibration.
This procedure only calibrates the TCA-1MEG 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 the TCA-1MEG and Host Instrument procedure (see
page 18).
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 c onnector 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 TCA-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 complete, the Probe Status field should
read Pass. If the field 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 panel.
The TCA-1MEG is now calibrated to the host instrument for the
specified channel only. If you move the TCA-1MEG to another
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-1MEG, you must perform the
Calibrate the P6139A Passive Voltage Probe to the TCA-1MEG and
Host Instrument procedure that follows.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
17
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 and/or
probe require you to adjust the low-frequency compensati on 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 (see page 20)
to optimize low-frequency compensation.
Test Equipment Hookup.
1. Connect the TCA-1MEG to a channel on your host instrument.
18
2. Connect the probe to the TEKPROBE input of the TCA-1MEG.
3. Using a nonterminated probe tip-to-BNC adapter, connect the
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
differences between the leading and trailing edges, perform the
LF Probe Compensation procedure to optimize low-frequency
compensation. (Use Figure 8 on page 22 as a guideline for proper
LF compensation.)
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 complete, the Probe Status field should
read Pass. If the field 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 panel.
The TCA-1MEG and probe are now calibrated to the host instrument
for the specified channel only. If you move 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 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 probe 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.
20
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Functional Checks
TDS6000 Series Oscilloscope
Probe compensation output
Probe tip adapter
(non terminated)
P6139A probe tip
TCA--1MEG
P6139A
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.
5. 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 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 position of the waveform to display on
center screen.
f. Close the panel.
6. Set horizontal scale to 1.0 ms.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
21
Functional Checks
7. On the Horiz/Acq menu, select Horizontal/Acquisition Setup, and
then choose the Acquisition tab.
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. Refer to Figure 8, be low.
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.
a. Set acquisition mode to High Resolution.
b. Close the panel.
22
Undercompensated Overcompensated
Properly compensated
Figure 8: Probe compensation waveforms
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Check Vertical Input Coupling
Verify t he AC, DC, and GND coupling of the T CA-1MEG.
Test Equipment Hookup. Refer to the hookup shown in Figure 9.
TDS6000 TekConnect oscilloscope
TCA--1MEG
BNC cable from TCA-1MEG input to PROBE
COMPENSATION output. Do not use a 50 Ω
terminator.
Figure 9: Test equipment hookup for the Vertical Input Coupling and
Bandwidth Limit checks
Functional Checks
Test Procedure. Do the following:
1. On the front panel of the host instrument, press the button
corresponding to the channel the TCA-1MEG is connected to.
2. Push the AUTOSET button to display a waveform on the screen.
3. If autoset does not set the host instrument to 500 mV/division,
manually change vertical V/division to 500 mV.
4. Using the Vertical Position control knob, position the waveform
to two divisons above center screen.
5. On the Vertical menu, select Vertical Setup, and then choose the
tab of the channel that the TCA-1MEG is connected to.
6. Set coupling to GND.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
23
Functional Checks
The resulting waveform should appear as shown in Figure 10,
below.
Figure 10: Typical waveform at GND
7. Set Coupling to AC, and set trigger level to 50%.
The resulting waveform should appear as shown in Figure 11 on
page 25.
24
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Functional Checks
Figure 11: Typical waveform at AC Coupling
8. Set Coupling to DC, and set trigger level to 50%.
The resulting waveform should appear as shown in Figure 12 on
page 26.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
25
Functional Checks
Figure 12: Typical waveform at DC Coupling
9. Leave the Coupling set to DC.
10. Close the panel.
26
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Check Bandwidth Limit
Verify bandwidth limits at full, 100 MHz, and 20 MHz.
Test Equipment Hookup. Use the same hardware configuration as the
Verti cal Input Coupli ng check. Refer to Figure 9 on page 23.
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. SetcouplingtoAC.
b. Set bandwidth to Full (500 MHz).
5. Set to trigger at 50%.
Functional Checks
6. Set the horizontal position of the leading edge to the left of center
screen.
NOTE. When full bandwidth is set, overshoot and ringing on the
signal is normal and does not indicate problems with the
TCA-1MEG.
The resulting waveform should appear as shown in Figure 13 on
page 28.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
27
Functional Checks
Figure 13: Typical waveform at Full (500 MHz) bandwidth
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 in Figure 14 on
page 29.
28
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Functional Checks
Figure 14: Typical waveform at 100 MHz bandwidth
8. Set bandwidth to 20 MHz.
NOTE. When the 20 MHz bandwidth limit is set, signal risetime is
near 15 ns.
The resulting waveform should appear as shown in Figure 15 on
page 30.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
29
Functional Checks
Figure 15: Typical waveform at 20 MHz bandwidth
9. After completing the bandwidth limit checks, do the following:
a. Set bandwidth to Full.
b. SetcouplingtoDC.
c. Press AUTOSET.
d. Close the panel.
30
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Specifications
These specifications apply to the TCA-1MEG High Impedance
Buffer Amplifier when used with Tektronix TekConnect host
instruments.
Specifications for the TCA-1MEG fall into three categories:
warranted, typical, and nominal characteristics. Performance
Verification procedures are provided in the Performance Verification
section for specifications marked with the n symbol in Table 3.
Specifications
CAUTION. To prevent damage to the TCA-1MEG, do not apply
voltages that are beyond the input voltage rating for the TCA-1MEG
specified in Table 3.
Table 3: Warranted electrical specifications
Characteristic Description
nBandwidth (TCA-1MEG only), at --3dB,
100 mV/division with 50 Ω termination
Attenuation Maximum sensitivity to 10 V/division in
Input Capacitance 10 pF ±2pF
Input Resistance, DC Coupled
P6139A Probe tip Bandwidth with
TCA-1MEG, at 100 mV/division
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
≥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%
1--2--5 sequence on a Tektronix host
instrument
1MΩ ±1% at DC
1MΩ ±10% at ⎢Vin⎢>50V
≥500 MHz with TCA-1MEG connected to a
Tektronix 50 Ω host instrument that has
≥1.5 GHz bandwidth.
31
Specifications
Table 3: Warranted electrical specifications (Cont.)
Characteristic Description
Input Voltage Rating1(with TCA-1MEG or a
1X probe)
1
RMS voltage limited to ≤150 V for arbitrary waveshapes including DC. For
150 V, CAT 1
pulse widths less than 50 s, 400 Vpk, <30% DF. RMS = Root Mean Square
= rms = the square root of the average of the sum of the squares of the
instantaneous voltage in one cycle =
Ꭹ
ᒑ
(fxi)2ፒn
Table 4: Typical electrical characteristics
Characteristic Description
Linear dynamic range The lesser of ±5 divisions or the dynamic
range of the TekConnect host instrument.
Bandwidth (TCA-1MEG only)
Linearity
Full bandwidth small signal risetime
(TCA-1MEG only)
≥500 MHz when used with a TekConnect
host instrument that has ≥1.5 GHz bandwidth
100 MHz ±25%
20 MHz ±25%
ᐔ0.2%
800 ps calculated from 0.40 / measured
bandwidth
AC Coupling (LF 3 dB cutoff frequency) ≤10 Hz with TCA-1MEG
≤1 Hz with P6139A probe attached
DC Offset Drift
Displayed system input offset ±0.2 divisions or less, when used within
Propagation Delay ≤2ns
32
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
600 V/°C or less at output of TCA-1MEG
±5 °C of calibrated temperature for
V/division settings ≥10 mV/division
Specifications
Ω
1M
Magnitude
Input Impedance and Phase versus Frequency
Ω
100 K
Ω
10 K
Ω
1K
Phase
Magnitude (ohms)
Ω
100
Ω
10
1Hz
10 Hz
1KHz
100 Hz
10 KHz
1MHz
100 KHz
10 MHz
Frequency
Figure 16: Typical Input Impedance and Phase versus Frequency
0 °
-- 10. 0 °
-- 20. 0 °
-- 30. 0 °
-- 40. 0 °
-- 50. 0 °
-- 60. 0 °
-- 70. 0 °
-- 80. 0 °
-- 90. 0 °
-- 100. 0 °
1GHz
100 MHz
Phase (degrees)
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
33
Specifications
1000
100
RMS
10
Voltage Derating versus Frequency
VAC
1
0.1
1KHz
100 Hz
10 KHz
100 KHz
Frequency
1MHz
10 MHz
Figure 17: Voltage Derating versus Frequency
1GHz
100 MHz
34
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
31.5 mm
[1.240 in]
108.08 mm
72.9 mm
[2.870 in]
[4.255 in]
Figure 18: TCA-1MEG dimensions
Specifications
28.58 mm
[1.125 in]
46.1 mm
[1.815 in]
43.43 mm
[1.710 in]
Table 5: Physical characteristics
Characteristic Description
Unit weight (TCA-1MEG) 5.5 oz (155 g) net
Table 6: Environmental characteristics
Characteristic Description
Operating Temperature
+32_F to + 122 _ F(0°Cto+50°C)
Humidity ≤80% relative humidity through the entire operating
range
Altitude Operating: 9,842 ft (3,000 m)
Nonoperating: 50,000 ft (15,240 m)
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
35
Specifications
y
Table 7: Certifications and compliances
Category Standards or description
EMC Compliance Meets the intent of Directive 89/336/EEC for Electromagnetic
Compatibility when it is used with the product(s) stated in the
specifications table. Refer to the EMC specification published
for the stated products. May not meet the intent of the directive
if used with other products.
FCC Compliance Emissions comply with FCC Code of Federal Regulations 47,
Part 15, Subpart B, Class A Limits.
EC Declaration of
Conformity -- Low
Voltage
U.S. Nationally
Recognized Testing
Laboratory Listing
Canadian Certification CAN/CSA C22.2 No. 1010.1
Additional Compliance ISA S82.02.01:1999
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 for electrical equipment for
measurement, control, and laboratory use.
UL3111-1
Standard for electrical measuring and test equipment.
Safety requirements for electrical equipment for
measurement, control, and laboratory use.
Safety standard for electrical and electronic test,
measuring, controlling, and related equipment.
IEC61010-1/A2:1995
Safety requirements for electrical equipment for
measurement, control, and laboratory use.
36
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Table 7: Certifications and compliances (cont.)
Category Standards or description
Specifications
Installation (Overvoltage)
Category Descriptions
Terminals on this product may have different installation
(overvoltage) category designations. The installation categories
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 operated circuits of
electronic equipment.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
37
Specifications
Table 7: Certifications and compliances (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) -- grounded
Pollution Degree Pollution Degree 2 (as defined in IEC 61010-1). Note: Rated for
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 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 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 direct sunshine,
rain, or direct wind.
Pollution Degree 4
Pollution that generates persistent conductivity through
conductive dust, rain, or snow. Typical outdoor locations.
product
indoor use only.
38
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
WARNING
The following servicing instructions are for use only by
qualified personnel. To avoid injury, do not perform any
servicing other than that stated in the operating instructions
unless you are qualified to do so. Refer to all safety
summaries before performing any service.
Performance Verification
Use the following procedure to verify that the TCA-1MEG High
Impedance Buffer Amplifier meets the warranted specification
marked with a n in Table 3 of the Specifications section.
Perform a probe calibration (a TCA-1MEG calibrati on) procedure
before performing this test. Refer to page 16 of the Functional
Checks section for the probe calibration procedure.
Verify this specification:
H TCA-1MEG System Bandwidth
Before beginning this procedure, photocopy the test record on
page 45, and use it to record the performance test results.
The equipment in Table 8, or a suitable substitute, is required for
testing the TCA-1MEG.
Table 8: Equipment required for performance verification
Minimum
Description
Oscilloscope TCA-1MEG in a Tektronix
requirements Examples
TekConnect Oscilloscope
with a bandwidth ≥1.5GHz
TDS6000, TDS7000, or
CSA7000 TekConnect
instruments
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
50 KHz to 500 MHz ± 3%
amplitude accuracy
BNC connectors Tektronix part number
Tektronix part number
012-0057-XX
Wavetek 9500
011-0049-XX
Modules.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
1
41
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 firmware 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, ref er to the
user manual and online help supplied with your instrument.
TCA-1MEG System Bandwidth
This test verifies the system bandwidth.
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 output of the leveled sine wave
generator to the input of the TCA-1MEG. Refer to Figure 19, below.
42
Leveled sine-wave
generator
Output
50 Ω coaxial cable
TDS6000 Series Oscilloscope
TCA--1MEG
50 Ω
terminator
Figure 19: TCA-1MEG System Bandwidth equipment hookup
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
Performance Verification
System Bandwidth 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 Horizontal/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 instrument:
a. Full
b. 100 MHz
c. 20 MHz
9. On the Vertical Setup panel, set the vertical bandwidth that you
are testing (refer to step 8, above).
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
43
Performance Verification
10. Set the horizontal scale to 10 s/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 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 100 MHz,
S Set the sine wave generator to 75 MHz. Set the
horizontal scale of the oscilloscope to 10 ns/division.
Record the measured value.
S Set the sine wave generator to 125 MHz. Record the
measured value.
44
c. For bandwidth limit set to 20 MHz,
S Set the sine wave generator to 15 MHz. Set the
horizontal scale of the oscilloscope to 20 ns/division.
Record the measured value.
S 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 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
Performance Verification
Use this test record to record the test results of the TCA-1MEG
System Bandwidth tests.
TCA-1MEG Test Record
Instrument Serial Number: Certificate Number:
Temperature: RH %:
Date of Calibration: Technician:
Input Amplitude (600 mV):
System bandwidth verification
Input voltage Specification
1
Measured as
Full
(500 MHz)
≥ 425 mV
p-- p
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
1
The 425 mV specification limit is based on a 600 mV input level.
≥ 425 mV
≤ 425 mV
p-- p
p-- p
- 3 dB voltage level = input voltage x 70.7% ,
calculated as 425 mV = 600 mV x 0.707
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
45
Performance Verification
46
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 list 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 benefit of the latest circuit improvements. Therefore, when
ordering parts, it is important to include the following information in
your order:
H Part number
H Instrument type or model number
H Instrument serial number
H 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.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
47
Replaceable Parts
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 Cataloging Handbook H6-1 can be used
where possible.
Indentation System
This parts list is indented to show the relationship between items.
The following example is of the indentation system used in the
Description column:
12345 Name&Description
Assembly and/or Component
Attaching parts for Assembly and/or Component
Detail Part of Assembly and/or Component
Attaching parts for Detail Part
Parts of Detail Part
Attaching parts for Parts of Detail Part
(END ATTACHING PARTS)
(END ATTACHING PARTS)
(END ATTACHING PARTS)
48
Attaching parts always appear at the same indentation as the item it
mounts, while the detail parts are indented to the right. Indented
items are part of, and included with, the next higher indentation.
Attaching parts must be purchased separately, unless otherwise
specified.
Abbreviations
Abbreviations conform to American National Standards Institute
(ANSI) standard Y1.1
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
BEAVERTON, OR 97077-- 0001
Replaceable Parts
PO BOX 500
Mfr.
code Manufacturer Address City, state, zip code
Manufacturers cross index
80009 TEKTRONIX INC 14150 SW KARL BRAUN DR
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
49
Replaceable Parts
4
3
Mfr. part no.
Mfr.
code
80009 TCA-1MEG
5
1MEGOHM / 10PF, TEKPROBE BNC-TO-TEKCONNECT,
with P6139A
12345 name & description
1
Qty
Serial no.
Effective Dscont
STANDARD ACCESSORIES
2
TCA--1MEG
part no.
Tektronix
Figure 20: TCA-1MEG replaceable parts
TCA-1MEG 1 TCA-1MEG AMPLIFIER, HIGH IMPEDANCE BUFFER,
-- 2 P6139A 1 P6139A !0X PASSIVE PROBE; STANDARD ACCESSORIES 80009 P6139A
Fig. &
index no.
20-- 1
-- 3 071-1010-XX 1 MANUAL,TECH:INSTRUCTION,TCA-1MEG 80009 071-1010-XX
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual50
Mfr.
Mfr. part no.
code12345 name & description
80009 063-3541-XX
80009 063-3461-XX
Replaceable Parts
TDS6000 SERIES
TDS7000 SERIES
Qty
Serial no.
Effective Dscont
part no.
Tektronix
063-3541-XX 1 SOFTWARE PKG; PRODUCT SOFTWARE, CD, V2.1.0;
-- 5 063-3461-XX 1 SOFTWARE PKG; PRODUCT SOFTWARE, CD, V2.1.0;
-- 4
Fig. &
index no.
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual
51
Replaceable Parts
Mfr. part no.
Mfr.
code
80009 063-3376-XX
OPTIONAL ACCESSORIES
12345 name & description
Qty
Serial no.
Effective Dscont
part no.
1
Figure 21: TCA-1MEG optional accessories
Tektronix
Fig. &
index no.
PRODUCT CD
21-- 1 063-3376-XX 1 TDS7000 SERIES APPLICATIONS SOFTWARE PKG,
TCA-1MEG High Impedance Buffer Amplifier Instruction Manual52
Loading...