Tektronix T202 User manual

TE K
OPERATORS
MANUAL 070-6419-00 Product Group 40
T202
PORTABLE
OSCILLOSCOPE
Tektronix®
CCMMITTEl TO EXCELLENCE

TEKOPERATORS
MANUAL 070-6419-00
Product Group 40
T202
PORTABLE
OSCILLOSCOPE
Please Check for
CHANGE INFORMATION
at the Rear of This Manual
First Printing JUL 1987
"R!ktronoo
COMMITTED TO EXCEU£NCE

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Copyright © 1987 Tektronix , Inc . All rights re-
served. 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 pend-
ing patents.
TEKTRONIX, TEK , SCOPE-MOBILE and ~
are registered trademarks of Tektronix, Inc.
Pri nted 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 manu-
facture. The last five digits of the serial number
are assigned sequentially and are unique to each
instr ument. Those manufactured in the United
States have six unique di gits . The country of
manufacture is Identified as follows:
8000000
100000
200000
300000
700000
Tektronix, Inc ., Beaverton ,
Oregon, U.S. A.
Tektronix Guernsey , Ltd .,
Channel Islands
Tektron ix United Kingdom, Ltd .,
London
Sony/Tektronix , Japan
Tektronix Holland, NV ,
Heerenveen , The Netherlands
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TABLE OF CONTENTS
Page
LIST OF ILLUSTRATIONS ................ Ill
OPERATORS SAFETY SUMMARY .. .. ... . IV
Section 1 GENERAL INFORMATION
Introduction ............. . ...... 1-1
Preparation For Use .. . ... . ...... 1-2
Safety .. . .. . . ............... 1-2
Ac/De Adapter .............. 1- 3
Battery Pack .. ... .. ... . ..... 1- 3
Plastic Cover ............... 1- 11
Power-Up Checks . .. ... . .... 1-12
Repackaging ........ ... .... 1-12
Section 2 CONTROLS, CONNECTORS , AND
INDICATORS
Input and Display .. . .... . ... . 2- 1
Channel 1 and Channel 2
Vertical and Horizontal Keys ... 2-3
Trigger Keys ................ 2-4
Source and Change - Over
Keys ...... . ... . ............ 2- 6
Mode Keys .................. 2-7
Positioning, Cursors , and
Tracking Keys .... . ... . ...... 2-8
Save Reference and Signal
Processing Keys . . ... .. .. ... . 2-8
Display and Sound Keys .. .. ... 2-9
Arithmetic , Numeric Entry
and Di mension Keys ......... 2-10
Special-Purpose Keys ....... 2- 12
Data Readout . . ............ 2-13
DVM/ COUNTER Readout .... 2-16
Section 3 OPERATING CONSIDERATIONS
Grounding ...... . ... .. .. . .... 3- 1
Signal Connections . .. .. ... ... 3-1
Audible Tone .......... . ..... 3- 2

TABLE OF CONTENTS (cont)
Page
Section 4 OPERATING INSTRUCTIONS
Using the Keyboard . .. . .. . .. . 4- 1
Turn ing the Input Channels
On/ Off . .. .. . . . . . . .. . .. . . ... 4-1
Auto Setup ....... . ..... . .... 4- 1
Display . .... . ........ . ...... 4-2
Vertical . . .. . ..... . ... . .. . .. . 4- 3
Ti me Base ...... . ........... 4- 5
Delta Time Measurements . ... 4- 6
Tr i gger ........ . .... . ... . ... 4- 7
Cursors Measurements . .. . .. 4- 1O
Channel 1 and Channel 2
Data Readout . .. ... .. ...... 4- 13
Signal Process ing .......... . 4- 14
Saving Front Panel Setups . .. 4- 16
Save References . .. . ........ 4- 17
X-Y Mode . . .. .. .. . ..... . .. 4-20
Digi tal Voltmeter and
Counter . . .. . . .. . . .. . .. . .. . 4- 20
Sect i on 5 PERFORMANCE CONDITIONS
T2 02 Electr i cal
Characteristics . . ............ 5- 1
Battery Pack Electr ical
Characteristics . . ..... . .. . ... 5-5
Environmental
Characteristics ............ .. 5- 7
Physical Characteristics .. . ... . 5-8
Section 6 OPTIONS AND ACCESSORIES
Introduct ion ... . ........... . . 6-1
Option A 1-A5 Internat ional
Ac /De Adapter .......... . ... 6- 1
Standard Accessories .. . .. . .. 6- 2
Optional Accessories .... . .. .. 6- 2
II
Figure
1- 1
1- 2
1- 3
1- 4
2- 1
2- 2
2- 3
2-4
2- 5
2- 6
2- 7
2- 8
2- 9
2- 10
2- 11
LIST OF ILLUSTRATIONS
Page
The T202 Oscilloscope ........... . VI
Instrument power receptacle
and power cord ....... . ... .. .... 1-3
Battery pack controls ,
connectors, and Indicator ....•... 1-4
Retaining screw and cover ........ 1-6
Battery compartment ........... . 1- 7
Connectors , controls , and
display .. . .. . ...... .. ........... 2 -2
Vert ical and horizontal
keys ... . . .. .. .. ............. . .. 2- 3
Trigger keys . . .. ................ 2-4
Source and change - over ke ys .... 2- 6
Mode , positioning, cursors , and
tracking keys ..... . .. .. ... . ..... 2-7
Save reference and signal
processing keys . ...... .. ........ 2-8
Display and sound keys . . ... . ... 2-1 0
Arithmetic , numeric entry .
and dimension keys ............. 2-11
Spec ial- purpose keys ........... 2-12
Channel data readouts ... .. ..... 2-14
DVM/ COUNTER ........... . .. . 2- 17
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OPERATORS SAFETY SUMMARY
The sa fe ty information in th is s ummary is tor oper-
ating pe rs onnel . Warnings and cautions will also
be fo und throughout the manual where they ap-
pl y.
Measurement Specifications
M ax imum saf e operating potential betwe en probe
c ommon plus input circuit to earth ground shall not
ex ceed 42 vo lts de + peak ac.
Measuring terminal input common references are
c onnected to each other internally . To avoid
measureme nt errors , do not connect voltages of
di fferent potentials between input terminals com-
mons .
For floating measurements above 42 volts peak ,
TEKTRONIX model A6902B is recommended for
s afe measurement operat ions.
Terms in this Manual
CAUTION statements identify conditions or prac-
ti ces that could result in damage to the equipment
or other property.
WARNING statements identify conditions or
practices that could result in personal injury or loss
of life.
Terms as Marked on Equipment
CAUTION i ndicates a personal injury hazard not
immediately accessible as one reads the mark-
ings, or a hazard to property , including the equip-
ment itself.
DANGER in dicates a persona l injury ha za rd im-
mediately accessible as one reads the marking .
IV
Symbols in this Manual
This symbol ind ica tes where applicable
cautionary or other information is to
be found . For maximum input voltage
see the T202 Electrical Characteristics
in Section 5.
Symbols as Marked on Equipment
ATTENTION - Refer to Manual.
Po we r Source
Use only the Ac Power Adapter specified for prod-
uct in put voltage rating . For battery operation ,
refer to " Battery Pack " in Section 1.
Do Not Operate in Explosive Atmospheres
Do Not Remove Covers or Panels
Do not remove the product covers or panels. Do
not operate the product without the covers and
panels properly installed.
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The T202 Oscilloscope
VI
6419-01
GENERAL INFORMATION
Introduction
The TEKTRONIX T202 Oscilloscope is a rugged,
lightweight digital storage instrument. The instru-
ment performs voltage , time , and frequency
measurements on acquired waveforms . The T202
is a microprocessor controlled instrument and may
be powered either from Its battery pack or, using
the supplied adapter , from an ac power source.
Waveforms and measurement results are dis-
played on a Liquid-Crystal Display (LCD) with a
128 x 128 point display matrix.
The dual-channel vertical system has a 5-MHz
bandwidth with calibrated deflection factors from
O. 01 volt per division to 20 volts per division. The
horizontal system has separate timing circuits for
each vertical channel and two time bases with
horizontal deflection factors from 1 hour per divi-
sion to 50 nanoseconds per division. Second per
division time base provides the timing speed for
the signal acquisition and delta time base expands
a selected portion of the second per division time
base to full display width .
Acquisition triggering setups can be automatically
made by the instrument or they may be user se-
lected for each of the two vertical input channels.
A selectable trigger point permits the user to set
the pretrigger and post-trigger portions of the ac-
quired waveform.
Specified points on an acquired waveform for mak-
ing voltage, time, frequency, or phase measure-
ments are user selectable with vertical or horizon-
tal measurement cursors. Cursor measurement
results are displayed at the top and bottom of the
display. Automatic digital voltmeter and counter
measurement of the RMS voltage , mean voltage,
peak-to-peak voltage , zero-to-peak voltage , pe-
riod, and frequency of a selected vertical channel
signal is also available. Digital voltmeter and
counter measurement results are displayed in a
table format.
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Acquired waveforms may be saved in any of nine
nonvolatile memories. The stored waveforms may
then be recalled at a later time to compare against
the waveforms being acquired . Time base and
trigger keyboard settings may also be saved in the
nonvolatile memory for later recall. Recalling a
frequently used setup speeds up the measurement
by reducing the number of keyboard entries
needed .
Signal processing of both input channels and save
reference information is available. Input Channels
or reference in any combination can be added,
subtracted , multiplied, or divided.
The following items are standard accessories
shipped with the instrument .
2 Probe packages
1 AC/DC Adapter
Operators Manual
Battery Pack/Carrying Case
For information about standard accessories and a
list of the optional accessories , refer to " Options
and Accessories" (Section 6) in this manual. For
additional information on accessories and ordering
assistance , contact your Tektronix representative
or local Tektronix Field Office.
Preparation for Use
Safety
This section tells how to prepare for and to pro-
ceed with the initial start-up of the instrument.
Refer to the Operators Safety Summary at the
front of this manual for power source and other
safety considerations. Before connecting the in-
strument to a power source , read both this sec-
tion and the Safety Summary.
1-2
Ac/De Adapter
Instruments are shipped with a detachable ac/dc
adapter that plugs into an ac power-source outlet.
The adapter converts the alternating-current
source voltage to low-direct-current voltage for
the operation of the instrument. The ac/dc
adapter plugs into the instrument ' s power cord
receptacle as shown in Figure 1-1 .
POWER
CORD
6419-02
Figure 1-1. Instrument power recep-
tacle and power cord.
Instruments are shipped with the ac/dc adapter as
ordered by the customer. Information about the
available ac/dc adapter is found in " Options and
Accessories" (Section 6 of this manual) .
Battery Pack
NOTE
Batteries are not included with the bat-
tery pack.
The battery pack in the carrying case permits a
choice of battery operation of the T202 when a
source of ac power is not available. The battery
pack uses four D-size batteries , either alkaline or
rechargeable nickel-cadmium.
- General Information
1-3

WARNING I
The battery charger is for use with
ni ckel-cadmium batteries only. Other
types may ex plode or release hazard-
ous materials if recharged .
Controls and Indicator
See Fig ure 1 -2 for the location of the controls ,
connectors , and indicator .
1-4
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Figure 1-2 . Battery pack controls ,
connectors , and indicator .
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Power Switch- Turns the battery pack on
and off. Press in for on; press again for off .
High / Low Charge Switch-Selects charg-
ing rate for nickel-cadmium batteries . Press
in for high charging rate ; press out for low
charging rate . This switch is accessible
when the battery cover is removed .
De Power Cord-Plugs into the instrument
power receptacle when battery operation is
requ ir ed.
De Receptacle-Provides the connection
po in t for the ac / dc adapter when nickel-
cadmium batteries need to be recharged.
Power Indicator-Indicates either that bat-
tery output voltage is available or that charge
current is flowing when nickel- cadmium bat -
teries are being recharged .
I WARNING I
To avoid electric shock , disconnect
m easur ing terminals before attempting
to remove batteries .
Battery Installation
To install the batteries in the battery compart-
ment , perform the following steps :
1. Remove all contents from inside the carrying
case .
2. Remove the retaining screw from the battery -
pack cover ( see Figure 1- 3) .
- General Information
1-5

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3. Lift the battery pack cover and pull it out of
the slots In the si de wall of the carry i ng case
(see Figure 1-3) .
4. Re move any dead batteries from t he bat t ery
co mpar t men t .
SLOTS
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I SCREW
I/ COVER
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Figure 1-3 .
cover .
6419-04
Retain i ng screw and
Obse rve t he correct polar it y when in-
sert in g b atteries in the bat tery co m-
p art ment , Putting one or mor e of th e
b atte ries in bac k wards may cause th e
i nt ernal f use to open .
1-6
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5. Place the batteries in the battery compart-
ment , Observe the polarity indications as
shown on the bottom of the battery compart-
ment ( see Figure 1- 4) ,
6. Replace the battery - pack cover and accesso -
ries.
POSITIVE
TERMINAL NEGATIVE
TERMINAL
Fi gure 1-4. Battery compartment.
- General Information
6 419-05
1-7

NOTE
When operating the instrument from the
battery pack , always set the battery pack
power switch to on (button in) before
turning on the T202. Failure to do so
may result in keyboard lockup and a loss
of stored data. The keyboard lockup will
not damage the instrument or the bat-
tery pack . A lockup condition is cor-
rected by turning all the power switches
to off and using the turn-on seque nce .
Stored data that is lost cannot be recov-
ered.
Turning the Instrument On
1. Set both instrument Input Coupling (OFF , DC ,
GND, and AC) switches to OFF positions and
the battery-pack-power switch to off (button
out).
2. Plug the de-power cord from the battery pack
into the instrument de-power receptacle.
3. Set the battery-pack - power switch to on
( button in) .
4. Slide one or both instrument Input Coupling
switches to a coupling position (DC , GND , or
AC position).
Turning the Instrument Off
When turning the instrument off , set both Input
Coupling switches to OFF position before turning
the battery pack off . If the battery pack is mistak-
enly turned off first, reset all the power switches
to off and use the turn on sequence given in
" Turning the Instrument On • before attempting to
turn the instrument on again.
Battery Operation
In battery operating mode , the Power indicator
displays a steady light when there is sufficient bat-
tery voltage to operate the instrument. A blinking
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Power indicator shows that the output voltage of
the batteries has dropped below 4.75 volts. At the
time the Power indicator starts to blink, there is
sufficient battery capacity remaining to operate
the instrument for about 30 minutes with both
channels being displayed at temperatures between
20°c to 30°c (68°F to 86 °F) .
Operating Time
How long the instrument may be operated from
the battery pack depends on the battery condition
and the instrument's operating mode . There is as
much as two-to-one difference in power require-
ment depending on operating mode. The longest
battery pack operating time is obtained when only
one channel is displayed in normal mode. With
both channels displayed , the power consumption is
increased by about 35% . Worst case occurs when
both channels are displayed and the vertical inputs
are overdriven (several volts being applied to the
input with the Volts per Division switches set at
0. 01 V).
Battery life is prolonged by turning the instrument
off when not in use.
Rechargeable Batteries
WARNING
I
The
battery charger is for use with
nickel-cadmium batteries only. Other
types may explode or release hazard-
ous materials if recharged.
Before recharging the nickel- cadmium batteries ,
the high/low charge switch needs to be set to
match the ampere-hour rating of the batteries .
- General Information
1-9