Tektronix 211 User manual

TEKTRONIX@
211
. OSCILLOSCOPE
OPERATORS MANUAL

Copyright
© 1971 by
Tektronix, Inc.,
Beaverton, Oregon. Printed in the Unit ed States of
America. All rights reserved. Contents of this
public at ion may n ot be r eproduced in any form
without permission of the copy right owner.
U.S.A. and foreign Tektronix product s covered by
U.S. and foreign pat e nt s and/or pat ents pending.
Tektronix, In c. P.O . Box 500 Beaverton, Oregon 97005
070 - 116 3-00 971

TABLE OF CONTENTS
Introduction
General
Operating Voltage
Internal Battery Operation
AC Operation
Battery Charging
Operating Temperature
Controls And Connectors
General
Operator's Adjustments
General
®
Vertical Gain
Step Attenuator Balance
Horizontal Gain
Horizontal Timing
Focus
Auto Preset
211-0perators Ma nu al
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CONTENTS (cont)
General Operating Information
Intensity Control
Graticule
Deflection Factor
Signal Connections
Ground Considerations
Input Coupling
Trigger Source
Trigger Coupling
Trigger Slope
Trigger Level
Horizontal Sweep Rate
External Horizontal Operation
Applications
General
ii
Peak-To-Peak Voltage Measurements-AC
DC Voltage Measurements
Time-Duration Measurements
Determining Frequency
Risetime Measurements
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211
OSCILLOSCOPE
INTRODUCTION
General
The 211 Oscilloscope is a single-channel, 500 kilohertz
portable instrument using only solid state and integrated
circuit components (except CRT) . The small size of the 211
makes it an extremely portable oscilloscope for on-location
maintenance in many fields of application. The instrument
is mechanically constructed to withstand the shock,
vibration, and other extreme conditions associated with
portability. The DC to 500 kilohertz vertical system pro-
vides vertical deflection factors from one millivolt (at
reduced bandwidth) to 50 volts / division at the tip of the
integral high-impedance probe. The trigger circuits provide
stable triggering over the full bandwidth capabili tie s of the
vertical system.
The horizontal deflection system provides calibrated
sweep rates from 200 milliseconds to five microseconds/
division. A continuously variable sweep magnifier provides
uncalibrated sweep rates to at least five times the indicated
sweep rate, for a maximum sweep rate of at lea st one
microsecond/division. In addition, external horizontal
amplifier operation provides horizontal deflect ion factors
of one and 10 volts/ division. The resultant CRT display
produced by the vertical and horizontal deflection systems
® 211-0perators Manual 1

is presented on a 6 x 10 division graticule (each division
equals 0.203 inch).
The 211 can be operated either from AC line voltage or
from internal rechargeable batteries. Maximum total power
consumption is two watts. The internal batteries can be
recharged from the AC power line by the integral battery
charger (instrument off).
OPERATING VOLTAGE
Internal Battery Operation
The 211 is designed primarily for operation from the
internal rechargeable batteries. The operating time provided
from the internal batteries depends on trace intensity,
charge temperature, and discharge temperature. Typical
operating time from fully charged bat terie s at maximum
trace intensity when charged and operated at +20° C to
+30°C (+68°F to +86°F) is 4.5 hours. Extended operating
time is provided at lower trace intensity.
The BATTERY meter provides an indication of relative
charge level. When the meter indicates in the FULL range,
the internal batteries are charged to a sufficient level to
operate the instrument. However, if the BATTERY meter is
out of the FU LL region, not more than 15 minutes of
instrument operation remains. The 211 incorporates an
automatic battery protection circuit to prevent deep dis-
2 211-0perators Manual ®

charge and the resulting battery damage if the instrument is
operated after the battery charge level falls to about 10
volts.
AC Operation
All power li ne voltages must be sinuso id al. If the in ternal
batter ies of the 2 11 become discharged to the minimum
operating level, continued operation can be obtained by
connecting the instrument to an AC power source with the
attached power cord. Due to the circuitry connected wi th
the internal battery charger, the AC power line voltage
must be at least 110 volts for operation in th is manner . ..
Also, when operated with fully-charged batteries from an
AC line below about 110 volts and at maximum true
intensity, the internal batteries slowly discharge; approxi-
mately 36 hours of continuous operation can be obtained
with fully charged batteries at maximum intensity and
104-volt line. The internal batteries cannot be recharged
while the instrument is operated from the AC line.
If the 21 1 is to be operated on a power line other than
115 VAC 60 Hz, two considerations arise. The electrical
value of capacitors (C204, C210, C212, and C215) in the
instrument's power input circuitry must be changed. Refer
to the Maintenance Section of the Maintenance Manual for
the appropr i ate values of capacitance to be used .
® 211-0perators Manual 3

Also, when operating the 211 on other power sources, in
all likelihood it will be necessary to adapt the power plug of
the instrument's attached power cord to the power outlet
receptacle of the power line being used. Tho se instruments
ordered specifically for use outside of the United States will
have included as an additional standard accessory a power
cord with a female connector on one end that mates with
the plug on the 211 's power cord, and no plug or connector
on the other end. The user can instalI the appropriate plug
on the open end of this additional cord, and then use this
cord to connect the 211 to the various power outlet
receptacles.
Battery Charging
The charging characteristics of the nickel-cadmium
(N iCd) cells used in th is instrument vary with the
temperature at which they are charged. Batteries charged at
about +20 °C to +30°C (+68°F to +86°F) will deliver more
energy than when the same batteries are charged at a higher
or lower temperature.
To charge the batteries, connect the instrument to an
AC line and set the POWER switch to the OFF position.
Allow at least 16 hours for the batteries to reach full
charge. For longest operating life of the batteries, increase
the charge time of the instrument to at least 24 hours about
once a month . Thi s procedure balances the charge on all
cells in the battery, and reduces the possibility of any
individual cell becoming reverse charged .
4 211-0perators Manual ®

When the instrument is stored and not used for extended
periods of time, the nickel - cadmium batteries may self-
discharge. The rate at which this self-discharge occurs is
dependent upon the storage temperature and humid i ty . If
th is instrument is to be stored for extended periods of time,
particularly at either high ambient temperature or high
humidity, it is recommended that the batteries be run
through a full charge cycle (16 hour s) a bout every two
weeks, or that the ins trument be left connected to the AC
line.
Operating Temperature
The 211 can be operated where the ambient air
temperature is between -15 °C and +55 °C (+5°F and
+131° F) . The batteries should be charged onl y in ambient
temperatures between 0°C and + 40 °C (+32°F and +104° F) .
CONTROLS AND CONNECTORS
General
The controls and connectors for operation of the 211
are located on the right side of the in s trument . To make
full use of the capabilities of this instrument, the operator
should be familiar with the function and use of each of
these controls and connectors. A brief description of each
control and connector is given here. Some of the more
important instrument specifications are included here also.
® 211-0perators Manual 5

1. VOL TS/DIV-selects vertical deflection factor (variable con-
trol must be in CAL position for indicated deflection). Calibrated
position accuracy within 5%. Vertical system bandwidth: 1 mV/
div, 100 kHz; 2 mV/div, 200 kHz; 5 mV/div, 400 kHz; 10 mV/
div to 50 V/div, 500 kHz.
6 211-0perators Manual ®