Tektronix 2245A User manual

OPERATORS
MANUAL
070-6558-01
Product Group 46
2245A
PORTABLE
OSCILLOSCOPE
OPERATORS
Please Check for
CHANGE INFORMATION
at the Rear of This Manual
First Printing JAN 1989
Revised JUN 1989
COMMITTED TO EXCELLENCE

Copyright © 1987,1889 Tektronix, inc. Ail rights reserved. Contents of this
publication may not be reproduced in any form without the written permis¬
sion of Tektronix, Inc.
Products of Tektronix, Inc. and Its subsidiaries are covered by U.S. and
foreign patents and/or pending patents.
TEKTRONIX, TEK, SCOPE-MOBILE and
of Tektronix, Inc.
Printed in U.S.A. Specification and price change privileges are reserved.
INSTRUMENT SERIAL NUMBERS
Each instrument has a serial number on a panel Insert, tag, or stamped on
the chassis, The first number or letter designates the country of manufac¬
ture. The last five digits of the serial number are assigned sequentially and
are unique to each Instrument. Those manufactured in the United States
have six unique digits. The country of manufacture is identified as follows:
BOOOOOO Tektronix, inc., Beaverton, Oregon, U.S.A.
G100000 Tektronix Guernsey, Ltd., Channel Islands
E2000C0 Tektronix United Kingdom, Ltd., Marlow
J300000 Sony/Tektronix, Japan
H700000 Tektronix Holland, NV, Heerenveen, The Netherlands
HKOOOOO Tektronix, inc. Hong Kong
are registered trademarks

Power Source
This product is intended to operate from a power source that does not ap¬
ply more than 250 V rms between the supply conductors or between either
supply conductor and ground. A protective ground connection, by way of
the grounding conductor in the power cord. Is essential for safe operation,
Grounding the Product
This product is grounded through the grounding conductor of the power
cord. To avoid electrical shock, plug the power cord into a properly wired
receptacle before making any connections to the product input or output
terminals. A protective ground connection, by way of the grounding con¬
ductor in the power cord, is essential for safe operation.
Danger Arising From Loss of Ground
Upon ioss of the protective-ground connection, ail accessible conductive
parts, including knobs and controls that may appear to be insulating, can
render an electric shock.
Use the Proper Power Cord
Use only the power cord and connector specified for your product.
The power cord must be in good condition.
Read Section 1 for power-cord and connector information.
Use the Proper Fuse
To avoid fire hazard, use only a fuse of the correct type, voltage rating and
current rating as specified on the back of your product and in Table 6-1.
Do Not Operate in an Explosive Atmosphere
To avoid explosion, do not operate this product in an explosive atmosphere.
2245A Operators
ix

Do Not Remove Covers or Panels
To avoid personal injury, do not remove the product covers or panels. Do
not operate the product without the covers and panels properly installed.
x
2245A Operators

SECTION
NTRODUCTION
2245A Operators

Introduction
Description
The 2245A is a 100 MHz, four-channel, dual-sweep, portable oscilloscope
for general-purpose use (Figure 1-1). A microprocessor-based operating
system controls most of the functions in the instrument, including a voltage
and time cursor measurement system and a single-button automatic
front-panel setup feature. A menu-driven service mode provides for con¬
figuring of single-sweep readout displays, internal calibration, and servicing
diagnostics.
Figure 1-1. The 2245A Oscilloscope.
2245A Operators
1-1

Introduction
The vertical deflection system has four input channels. Two channels have
11 basic deflection factors from 2 mV to 5 V per division, and two channels
have two basic deflection factors of 0.1 V and 0.5 V per division. Basic
deflection factors can be extended with attenuator probes. VOLTS/DIV
readouts are switched to display the correct vertical scale factors when
properly coded probes are connected to the vertical input connectors.
The horizontal deflection system provides single, dual, or delayed sweeps
from 0.5 s to 20 ns per division {delayed sweep, 5 ms to 20 ns per division).
The trigger system provides stable triggering over the fui! bandwidth of the
vertical deflection system.
Alphanumeric crt readouts of the vertical and horizontal scale factors are
displayed at the bottom of the screen. On-screen vertical and horizontal
cursors provide accurate voltage, time, and frequency measurements;
measurement values are displayed at the top of the crt.
The measurement system provides direct readout of delta voltage, delta
time, and frequency from positionable cursors. Delay-time and delta-delay
measurements for time and frequency are available in ALT and B Horizontal
Modes.
By pressing a single button (AUTO SETUP), the front-panel controls can
be set up to produce a usable waveform display based on the voltage and
time characteristics of the input signals.
1-2
2245A Operators

Introduction
Standard Accessories
The following items are standard accessories shipped with the 2245A
instrument:
2 Probes, 10X, 1.5 meter, with accessories
1 Power cord
1 Power cord clamp
1 Operators manual
1 Reference guide
1 Crt filter, blue plastic (installed)
1 Fuse, 2A, 250 V. slow-blow
1 Accessory pouch, Ziploc
See Section 8 “Options and Accessories" for part numbers and further
information about standard accessories and a list of the recommended
optional accessories. For more information on accessories and ordering
assistance, contact your Tektronix representative or local Tektronix Fieid
Office.
2245A Operators
1-3

Introduction
PREPARATION FOR USE
Refer to the Operators Safety Summary at the front of this manual for
power source, grounding, and other safety information about the use of the
instrument. Before connecting the 2245A to a power source, read this
section and the Safety Summary.
Line Fuse
5 CAUTION |
t<vwwwv“
This instrument can be damaged if the
installed.
Verify the proper value of the power-input
procedure.
1. Press in the fuse-holder cap and release
clockwise rotation.
2. Pull the cap (with the attached fuse inside) out of the fuse holder.
3. Verify proper fuse value.
4. Install the proper fuse and reinstall the fuse-holder cap.
Line Voltage and Power Cord
The 2245A operates on line voltages from 90 to 250 V with line frequencies
ranging from 48 to 440 Hz. No line voltage selecting is necessary. Instru¬
ments are shipped with the power cord that was requested on the order.
The power cord must match the power-source outlet; if it does not, con¬
tact your Tektronix representative or local Tektronix Field Office. See
Figure 1-2 for optional power cords available.
The detachable three-wire power cord has a three-contact plug for con¬
nection to the power source and the protective ground. The power cord is
held to the rear panel by a clamp. The protective ground contact on the
plug connects (through the power cord protective-ground conductor) to
the accessible metal parts of the instrument.
wrong line fuse is
fuse with the following
it with a slight counter-
1-4
2245A Operators