Tektronix 214 User manual

O
Tektronix , Inc.
P.O.
Box
500
Beaverton
,
Oregon
97077
070-5055-00
Product Group 40
Tektronix
COMMITTED
TO
EXCELLENCE
WARNING
THE
FOLLOWING
SERVICING
INSTRUCTIONS
ARE
FOR
USE
BY
QUALIFIED
PERSONNEL
ONLY .
TO
AVOID
PERSONAL
INJURY
,
DO
NOT
PERFORM
ANY
SERVICING
OTHER
THAN
THAT
CONTAINED
IN
OPERATING
INSTRUCTIONS
UNLESS
YOU
ARE
QUALIFIED
TO
DO
SO
.
PLEASE
CHECK
FOR
CHANGE
INFORMATION
AT
THE
REAR
OF THIS
MANUAL .
214
OSCILLOSCOPE
SERVICE
SN
B300000 &
ABOVE
INSTRUCTION
MANUAL
B304255
1304259
MAGNETIC
DATA
CALIFORNIO
Serial
Number
First
Printing
SEP
1984
Revised
JUL 1989

Copyright  1973 , 1984 Tektronix , Inc. All rights reserved . Contents of this
publication may not be reproduced in any form without the written
permission
of
Tektronix ,
Inc.
Products of Tektronix , Inc. and its subsidiaries are covered by U.S. and
foreign patents issued and pending .
ERTRONI
TEKTRONIX , TEK , SCOPE - MOBILE , and
of Tektronix , Inc.
Printed in U.S.A. Specification and price change privileges are reserved .
are
registered
trademarks
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
manufacture .
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
:
B000000 Tektronix , Inc. , Beaverton , Oregon , U.S.A.
HK00000
TEKTRONIX , INC . ,
Hong
Kong
G100000 Tektronix Guernsey , Ltd. , Channel Islands
E200000 Tektronix United Kingdom , Ltd. , Marlow
J300000
Sony
/
Tektronix
,
Japan
H700000
Tektronix
Holland
, NV ,
Heerenveen ,
The
Netherlands


LIST OF ILLUSTRATIONS
LIST OF TABLES
OPERATORS SAFETY SUMMARY
SERVICING SAFETY SUMMARY
SECTION 1
SPECIFICATION
SAFETY CONSIDERATIONS .
TABLE OF CONTENTS
PERFORMANCE CONDITIONS
SECTION 2
OPERATING INFORMATION
INTRODUCTION
SAFETY CONSIDERATIONS
LINE FUSE ....
CONTROLS AND CONNECTORS
INTRODUCTION
FRONT PANEL CONTROLS ..
LEFT SIDE PANEL CONTROLS .
RIGHT SIDE PANEL CONTROLS
OPERATING CONSIDERATIONS ..
OPERATING POWER INFORMATION
Internal
Battery
Operation
..
Battery
Charging
AC
Operation
INTENSITY CONTROL
GRATICULE
.
CRT CARE ..
SIGNAL CONNECTIONS
GROUNDING ...
INPUT
COUPLING ..
OPERATOR'S ADJUSTMENTS
INTRODUCTION ...
EQUIPMENT REQUIRED
VERT GAIN
CHECK
STEP ATTENUATOR BALANCE
HORIZONTAL GAIN CHECK
HORIZONTAL TIMING CHECK
FOCUS .....
AUTO PRESET
Page
iv
1-1
1-1
2-1
2-1
2-1
2-2
2-2
2-2
2-3
2-3
2-5
2-5
2-5
2-5
2-5
2-6
2-6
2-6
2-6
2-7
2-7
2-8
2-8
2-8
2-8
2-8
2-9
2-9
2-9
2-9
214
Service ( SN
B300000 &
ABOVE )
SECTION 3
THEORY OF OPERATION
INTRODUCTION
GENERAL DESCRIPTION
DETAILED CIRCUIT DESCRIPTIONS
Vertical
amplifiers .
Chop
Oscillator .
Vert Mode Switch ..
Vertical and
Horizontal
Output
Amplifiers
Trigger
Generator
Auto
Preset .....
Sweep
Generator
Single Sweep .
Storage
..
Power
Supply
Overvoltage
Protection
CRT Circuit ...
SECTION 4 CALIBRATION
INTRODUCTION
PURPOSE ..
STRUCTURE .
TEST EQUIPMENT
LIMITS AND TOLERANCES .
STEP TITLES ....
PREPERATION FOR CALIBRATION
POWER SUPPLY AND CRT DISPLAY
VERTICAL DEFLECTION SYSTEM ..
TRIGGER SYSTEM .....
HORIZONTAL DEFLECTION SYSTEM
SECTION 5
MAINTENANCE
INTRODUCTION ...
STATIC - SENSITIVE COMPONENTS .
PREVENTIVE MAINTENANCE ...
INTRODUCTION
GENERAL CARE
INSPECTION AND CLEANING .
Exterior ..
Interior
..
LUBRICATION
SEMICONDUCTOR CHECKS .
PERIODIC READJUSTMENT .
Page
3-1
3-1
3-3
3-3
3-3
3-3
3-4
3-5
3-5
3-5
3-5
3-5
3-7
3-10
3-10
4-1
4-1
4-1
4-1
4-1
4-1
4-2
4-5
4-9
4-13
4-15
5-1
5-1
5-2
5-2
5-2
5-2
5-2
5-3
5-4
5-4
5-4

214
Service
(
SN
B300000
&
ABOVE
)
SECTION 5
MAINTENANCE (
cont
)
ii
TABLE OF CONTENTS ( cont )
TROUBLESHOOTING
INTRODUCTION
TROUBLESHOOTING AIDS ..
TROUBLESHOOTING
EQUIPMENT
TROUBLESHOOTING
TECHNIQUES
CORRECTIVE MAINTENANCE
INTRODUCTION ...
MAINTENANCE
PRECAUTIONS
OBTAINING REPLACEMENT
PARTS
...
MAINTENANCE
AIDS
.
INTERCONNECTIONS
TRANSISTORS
AND
INTEGRATED
CIRCUITS .....
SOLDERING TECHNIQUES ..
DISASSEMBLY INSTRUCTIONS .
REPACKAGING
FOR
SHIPMENT
SELECTABLE
COMPONENTS ..
Page
5-5
5-5
5-5
5-6
5-6
5-10
5-10
5-10
5-10
5-10
5-11
5-12
5-12
5-13
5-15
5-15
SECTION 6
OPTIONS
INTRODUCTION
OPTION 01 ..
OPTION 02 .
SECTION 7
SECTION
8
SECTION
9
REPLACEABLE
ELECTRICAL
PARTS
DIAGRAMS
Page
REPLACEABLE
MECHANICAL
PARTS
CHANGE
INFORMATION
6-1
6-1
6-1
O

Figure
2-1
2-2
3-5
3-6
3-7
The
214
Oscilloscope ..
Front panel controls ..
Right side panel controls .
3-1
Vertical input amplifiers detailed block diagram ..
3-2
Vertical and Horizontal output amplifiers detailed block diagram
3-3
Trigger / Sweep
Generator detailed
block diagram
3-4 Identification of portion of the Sweep Start Holdoff waveform at Pin 5
of
the
Single
Sweep
Board .
Storage circuit detailed block diagram .
Power Supply
circuit block
diagram
CRT
Circuit detailed
block diagram
Table
LIST OF ILLUSTRATIONS
5-1
Location of circuit boards
5-2
Multi - connector holder orientation
5-3
Location
of
screws
for
disassembly
5-4 Proper method for wrapping probes
5-5 Selecting power supply capacitors for 48 to 52 Hz sinewave operation
5-6
Selecting
power supply
capacitors for 58
to 62 Hz
sinewave operation
1-1
Specifications
2-1
Test
Equipment .
Test
Equipment
Required
.
Power Supply Limits
214 Service ( SN B300000 & ABOVE )
LIST OF TABLES
4-1
4-2
4-3
Deflection Accuracy Limits
4-4
Settings
for
Bandwidth Checks
5-1
Relative Susceptiblity to Stataic - Discharge Damage
5-2
External Inspection Check List ..
5-3
Internal Inspection Check List .
5-4
Maintenance Aids ...
5-5
Power Supply
Capacitors
Page
vi
2-2
2-3
3-2
3-4
3-6
3-7
3-8
3-9
3-10
5-5
5-6
5-13
5-14
5-16
5-16
Page
1-2
2-8
4-2
4-5
4-10
4-12
5-1
5-2
5-3
5-11
5-15
iii

214 Service ( SN B300000 & ABOVE )
OPERATORS
SAFETY
SUMMARY
The
general
safety information
in this
part of
the
summary is
for both
operating
and
servicing
personnel .
Specific
warnings
and
cautions will be
found throughouat
the
manual
where they
apply
, but
may not
appear
in this
summary
.
CAUTION
statements
identify
conditions or
practiaces
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
indicates
a
personal
injury
hazard not
immediately
accessible as
one
reads the
marking
, or a
hazard to
property
including
the
equipment
itself
.
DANGER
indicates
a
personal
injury
hazard
immediately
accessible
as one
reads the
marking .
4
Terms
In
This Manual
DANGER
-
High
voltage .
iv
This
symbol
indicates
where
applicable
cautionary or
other
information
is to be
found
.
Symbols
In This
Manual
Symbols As
Marked on
Equipment
ATTENTION
- refer
to manual
.
Protective
ground
(
earth
)
terminal .
Use the Proper Fuse
To
avoid fire
hazard , use
only the
fuse of
correct
type
,
voltage
rating and
current
rating as
specified
in the
parts
list for
your
product .
Refer
fuse
replacement
to
qualified
service
personnel
.
Do Not Operate in Explosive Atmospheres
To
avoid
explosion
, do
not
operate
this
product in
an
explosive
atmosphere
unless it
has
been
specifically
certified
for
such
operation .
Do
Not Operate
Without
Covers
To
avoid
personal
injury
, do not
operate
this
product
without
covers
installed .
O

214 Service ( SN B300000 & ABOVE )
SERVICING SAFETY SUMMARY
FOR
QUALIFIED
SERVICE
PERSONNEL
ONLY
Refer also to the preceding Operators Safety Summary .
Do Not Service Alone
Do
not
perform internal
service or
adjustment of this
product unless
another
person capable
of rendering first
aid
and
resuscitation is
present
.
Use Care When Servicing With Power Applied
Dangerous
voltages
exist at
several
points in this
product . To
avoid
personal injury
, do not
touch exposed
connections or components while power is applied .
Disconnect power before removing protective cover , soldering , or replacing components .

214 Service ( SN B300000 & ABOVE )
vi
CH 1
( X )
STEP
ATTEN
INPUT
COUPLING
AC KNO
* C
INPUT
COUPLING
AC
GND
OC
STEP
ATTEN
CH
2 BAL
m
Tektronix
POSITION
POS
POSITION
POS
READY
VAR V /
DAY
VAR
SINGLE
SWP
RESET
STORE
ERASE
VAR V / DIV
VOLTS
/
DIV
214
STORAGE
OSCILLOSCOPE
CH1
(
EXT
HORZI
POWER
(
BATTERY
CH2
TRICSSO
VERT
MODE
AUTO
PRESET LEVEL / SLOPE
2018
C # 2
TRIG
Wents
PIECET
INT
INTENSITY
OFF
TRIG
SOURCE
FOCUS
MONIZ
MAS
COCH EXT
VAR
POS
]
]
EXT
TRIG
Tektronix 214 Dual - Trace Storage Oscilloscope .
COMMON
5054-01

O
SPECIFICATION
INTRODUCTION
The
TEKTRONIX 214
Storage
Oscilloscope is a
portable
500 - kHz instrument that combines
mall
size
and
light
weight with the ability to make precision waveform
measurements . It
is
designed for general - purpose
applications where display storage is desired , along with
conventional (
NONSTORE )
operation .
The dual - channel
DC - to - 500 kHz
vertical
system
provides vertical deflection factors from 1 mV ( at a reduced
bandwidth ) to 50
V per division
at the tip of either
of the
integral high - impedance probes . Single trace operation is
achieved by selecting either CH 1 or CH 2 with the VERT
MODE switch and dual trace operation is achieved by
selecting BOTH from the VERT MODE switch . Single
Sweep operation is provided to display infrequently
recurring events . The trigger circuit provides stable
triggering over the full range of vertical frequency response .
Section 1-214 Service ( SN B300000 & ABOVE )
The horizontal deflection system provides calibrated
sweep rates from 500 mS to 5 S per division . Uncalibrated
sweep rates , via a variable sweep magnifier , are available to
at least 5 times the indicated sweep rate for a maximum of
at least 1 S per division . Stored Automatic Enhance occurs
( in Single Sweep mode ) at sweep rates of 0.1 ms per
division and faster .
X - Y operation is provided with Ch 1 supplying the
horizontal deflection of the applied ( X ) signal , with a range
from less than 1 mV to 50 V per division ( at a reduced
bandwidth of 50 kHz ) . Ch 2 suplies the vertical deflection of
the
applied
(
Y ) signal .
The 214 is operated either from AC line voltage or from
internal
rechargeable
batteries . The
internal batteries
are
recharged from the AC power line by the integral battery
charger ( with the instrument OFF ) .
PERFORMANCE CONDITIONS
This instrument will meet the following electrical
characteristics ( Table 1-1 ) after complete calibration . These
characteristics apply over an ambient temperature range of
-15  C to + 55  C ( + 5  F to + 131  F ) when operating from
the internal batteries , and  C to + 40  C ( + 32  F to
+ 104  F ) when operating from an AC line source , except as
otherwise indicated . Warm - up time for given accuracies is at
least 5 minutes .
1-1

Specification
214
Service
( SN
B300000 &
ABOVE
)
Characteristics
Deflection Factor
Range
Accuracy
Variable
Range
Frequency
Response
AC
Coupled
Lower
Bandwidth
Input
Resistance
Input
Capacitance
1
mV / DIV to
50 mV / DIV
100
mV /
DIV to 50
V / DIV
Maximum
Input
Voltage
50
V / DIV
to 0.1
V / DIV
50
mV / DIV
to 1 mV / DIV
Chopped
Mode
Alternate Mode
Input
Impedance
Matching
1-2
Table 1-1
SPECIFICATIONS
VERTICAL
DEFLECTION
SYSTEM
Performance Requirements
1 mV / DIV to 50 V / DIV in a 1-2-5 sequence of 15 steps .
Within 
5 % with
VAR
VOLTS / DIV
control
in CAL
position and
gain
correctly
set
at 5
mV /
div
.
Continuously
variable
between
calibrated
maximum
deflection
factor
to at
least 125 V / div
.
Six
-
division , 5
-
kHz reference
signal ,
with
VAR VOLTS
/
DIV control
in
calibrated
detent .
VOLTS
/
DIV
Setting
1 mV / DIV
2
mV /
DIV
5
mV /
DIV
10
mV
/
DIV
to
50
V /
DIVb
Approximately
2
Hz.a
1
 +
5
% .a
Approximately
160 pF.a
Approximately
140
pF.a
600 V (
DC +
peak AC
) .a
600 V
peak
- to -
peak
AC ( 5
MHz or
less
) .a
aperformance
Requirement
not
checked in
manual
.
bperformance
Requirement
not
checked in
manual above 10 mV
/ DIV .
settings .
Extends
Frequency
Response
DC to
100kHz
DC
to
200kHz
DC to
400kHz
DC
to
500kHz
600 V
( DC +
peak
AC ) .a
600 V
peak -
to -
peak
AC (
not over
2
kHz or a
risetime
100 nS
) .a
To
within 10 %
.
From
500
mS / DIV to
2 mS / DIV
of time
rate at
approximately
50
kHz.a
From
1
mS
/
DIV
to
5 S
/
DIV
of
time
rate.a

Trigger
Sensitivity
Internal
COMP
CH
2
External
Preset Trigger Level
Characteristics
Display
Jitter
External
Trigger
Input
Resistance
Input
Capacitance
Maximum
Usable
Input
Voltage
Sweep
Rate
Calibrated
Range
Accuracy
Linearity
Variable
Magnifier
Table
1-1 (
cont )
aperformance Requirement not checked in manual .
Performance
Requirements
TRIGGERING
SYSTEM
Specification
214 Service ( SN B300000 & ABOVE )
0.2
division from
DC to 500 kHz
.
0.2
division from
2 Hz to 500
kHz .
At least 1 V from DC to 500 kHz .
Triggered at
preset level on
positive
slope
of
triggering signal .
Sensitivity
same
as
stated
above
0.5 S
or
less at
500
kHz.a
HORIZONTAL DEFLECTION SYSTEM
Approximately
1
MS.a
Approximately
30
pF.a
8 V ( DC +
peak AC ) .
16
V peak - to
- peak AC
( 500 kHz
or less ) .a
500 mS / div to 5 S / div in a 1-2-5 sequence of 16 steps
Within 5 % with VAR HORIZ MAG control in CAL position measured
over the center 8 divisions ( disregard 1st 0.5 S of sweep length ) .
Within
5 % over
any 2
divisions within
the center
8
divisions
( disregard 1st 10 % of total sweep length ) .
Continuously variable between calibrated settings . Extends
maximum sweep
rate to at least
1 S / div .
1-3

Specification
214
Service ( SN
B300000
&
ABOVE
)
CH 1 Horizontal Input
Calibrated Deflection Factor
Variable
Accuracy
X - Y
Phasing
Maximum Input
Voltage
Graticule
Characteristics
Type
Area
Phosphor
Stored
Writing
Speed
Input
Common
to
214
Case
Exterior
Input
Common
to
AC
Line
1-4
aperformance
Requirement
not
checked in
manual .
Table
1-1 (
cont )
HORIZONTAL
DEFLECTION
SYSTEM ( cont
)
Performance Requirements
1
mV / div
to 50 V
/ div .
At
least 5 times
magnification (
using
VAR HORIZ
MAG
) .
Within 10
% (
with
VAR HORIZ
MAG
in
CAL
) .
Less
than
3 
to 5
kHz.a
Same as for CH 1 ( vertical ) .a
DISPLAY
Internal
Black line
, non
-
illuminated.a
6
divisions
vertical
by 10
divisions
horizontal.a
Each
division
equals
0.203
inch
.
P31
standard .
80
div /
ms.a
500
div / mS in
Automatic
Enhance ( internal
adjustment ) .a
ISOLATION
Maximum
floating
potential between
input
common
and
214
case
exterior
is
not to
exceed
500 V
RMS
sinusoidal or
700
V
(
DC +
peak
AC ) .
(
When
battery
operated
with
AC power
plug
secured
in
the
insulated cover . ) a
Maximum
floating
voltage
plus
AC line
voltage
is
not to
exceed
250 V
RMS
sinusoidal ,
or 1.4
times the
AC line
voltage
plus ( DC
+
peak
AC
)
not
to
exceed
350
V.a

Line
Voltage
Range
Stored Mode
Line
Frequency
Characteristics
Maximum
Power
Comsumption
Batteries
Charge
Time
From
AC Line
Power ( Battery ) Indicator
Battery
Excessive
Discharge
Protection
Typical
Operating
Time
Nonstore Mode
Store Mode
Typical Charge Capacity
aperformance Requirement not checked in manual .
Charge
Temperature
 C ( + 32  F )
+ 20  C to + 30  C ( + 68  F to + 86  F )
+ 40  C ( + 104  F )
Table
1-1
(
cont
)
AC
OPERATION
110 V to 126 V AC . Batteries can not be charged during AC
operation .
58
to 62
Hz .
Instrument
can
be
operated
between
104 V
and 110
V with
a
resulting
slow
discharge of
internal
batteries.a
Performance
Requirements
Specification
214
Service ( SN
B300000 &
ABOVE )
3
watts
or less
at 126 V
, 60
Hz.a
INTERNAL
BATTERIES
10
rechargeable A
size ,
nickel -
cadmium cells.a
8 hours for full charge ( instrument off during charge cycle ) .a
When extinguished indicates approximately 5 minutes of scope
operating life
left in
the
batteries
.
Instrument operation automatically interrupted when battery charge
drops
to
10 V ,

0.5
V.
At
maximum
trace instensity
after full charge
cycle at
+ 20  C to
+
30  C
.
3.5
to 5 hours
.
Longest operating
time
provided at lower
trace
intensity.a
2.5 to 3.5 hours . Longest operating time provided at lower trace
intensity.a
In
reference
to charge
/ discharge
at + 20  C to +
30  C ( + 68  F to
+
86 
F ) .
See
chart
below.a
Typical
Charge
Capacity
-15
 C
( + 5 
F )
40 %
65 %
40 %
Operating
Temperature
+ 20  C to + 30  C
( + 68  F to + 86  F )
60
%
100 %
65 %
+ 55 
C ( +
131
 F
)
50
%
85
%
55
%
1-5

Specification
214
Service
( SN
B300000
&
ABOVE
)
Temperature
Operating
from
Batteries .
Operating
from
AC
Line
Non -
Operating
Altitude
Operating
Non -
Operating
Humidity
Operating and Non - operating
Shock
Characteristics
Operating and Non - operating
Weight ( without accessories )
Dimensions ( measured at maximum points )
Height
Width
Depth
1-6
Table
1-1 (
cont
)
ENVIRONMENTAL
-15  C to + 55  C ( + 5  F to + 131  F )
Performance
Requirements
 C to + 40  C ( + 32  F to + 104  F )
-40  C to + 60  C ( -40  F to + 140  F )
To 25,000 ft . Maximum operating temperature decreased by 1  C per
1,000 ft above 15,000 ft .
To
50,000 ft .
5
cycles (
120
hours ) to 95 %
relative
humidity in
reference
to MIL -
E
16400F .
Tested with 2 shocks at 150 g , one - half sine , 1 mS duration each
direction
along
major
axes
.
PHYSICAL
3.5
lb (
1.6
kg
) .
3.0 in (
7.6 cm
) .
5.25 in (
13.2
cm ) .
9.5
in
(
24.1
cm ) .

OPERATING
INFORMATION
INTRODUCTION
This section of the manual provides information on
instrument
power
requirements , and
the
functions
of
the
controls and connectors . Operating considerations ,
intended to
familiarize the
operator with
basic
measurement
techniques
, and
operator's
checks
and
adjustments
for the
214 are included . For additional operating information , refer
to the 214 Operators Manual .
SAFETY
CONSIDERATIONS
Section
2-214
Service ( SN
B300000 & ABOVE
)
Refer to the
Safety
Summary
at the
front
of
this
manual
for
safety
considerations
pertaining
to the use
of the
instrument . Before connecting the oscilloscope to a power
source ,
read
entirely both
this
section and
the
Safety
Summaries .
WARNING
When
battery
operated , store
the AC plug
in the
insulated
compartment
in the
rear of
the
instrument .
The
RFI
circuitry
connected
between the
instrument
common
and the
AC
power
plug
can
cause
small
amounts
of
current
from
an
elevated
reference
to be
present on
the AC
power plug
, imposing
a
possible
shock
hazard .
LINE FUSE
The
Line Fuse
for this
instrument is
located
inside
the
cabinet . For fuse replacement , refer to the " Disassembly
Instructions "
in the
Maintenance
section to
remove the
cabinet and refer
to the "
Replaceable
Electrical Parts
" list
for
choosing
the
correct replacement
fuse .
2-1

Operating
Information
214 Service ( SN B300000 & ABOVE )
Controls and
connectors
necessary for operation
of the
214 are located on the front and right side panels of the
instrument
. The
power on off
switch is
located on
the
lower
left
side of
the
instrument .
Vertical
controls are
color -
coded
with
the tip
of the
corresponding
probe . To
make full use of
the
capabilities
of this
instrument
, the
operator
should be
familiar with
the
function and use
of each
control and
connector .
8
2-2
CONTROLS
AND
CONNECTORS
INTRODUCTION
BAD
2 3
999999999
4
5
FRONT
PANEL
CONTROLS
1
)
READY
LED
- Indicates
sweep has
been reset and
a
single
display will
be
presented
upon receipt
of an
adequate
trigger
signal .
COMMON and
probe
ground
straps are
electrically
connected
.
Therefore
, an
elevated
reference
applied
to
any
ground is
present
on
the
others -
as
indicated
by
the
yellow
warning
bands
under
the probe
retractable
hook tips
, and the
ground
strap
protective
coverings .
6
Figure
2-1
.
Front
panel
controls .
WARNING
1
1 )
L
5054-02
2 ) SINGLE SWP - When pushed , the sweep operates in
the
Single
Sweep
mode .
After
a
sweep is
displayed
,
further
sweeps cannot
be
presented
until
the
RESET
button
is
pressed
and
released .
Automatic
Enhance
occures
in SINGLE
SWP storage
at
sweep
rates
of
0.1
ms / div
and
above .

3 ) RESET -
When
pressed and in the
Single Sweep
mode , a single display will be presented after correct
triggering . Must be pressed again before another
sweep can
be
displayed .
When
VERT MODE
switch is
set to BOTH , only one channel will be displayed for
each RESET actuation .
4 )
STORE
-
When
pushed
, the
CRT
operates in the
Storage mode . With the button out , the CRT operates
in the conventional , NONSTORE , mode . Automatic
Enhance provides faster storage capabilities when in
SINGLE SWP at sweep rates of 0.1 ms / div and faster .
5 ) ERASE - Momentary contact switch that , when
pushed and released , erases a stored display from the
CRT .
6 ) POWER ( BATTERY ) -Red LED to indicate when the
instrument is on .
When light
extinguishes ,
battery
charge is low and about five minutes of operating life
remains
.
7 ) VOLTS / DIV -
Selects
vertical
deflection
factor
( vertical VAR must be in the CAL position for
indicated
deflection ) .
LEFT SIDE PANEL CONTROLS
8 Power ON - OFF - Turns the instrument on or off
regardless of whether the internal battery source or
an external AC source is being used . Does not
interrupt
charging
current to the
internal
batteries
when the instrument is connected to AC line voltage .
9
HIDD
10
12
14
15
11
) (
13
RIGHT SIDE
PANEL
CONTROLS
AND
CONNECTORS
9 ) INPUT COUPLING - Selects method used to couple
the channel input signal to the vertical amplifier
system .
Operating
Information
214 Service ( SN B300000 & ABOVE )
AC Input signal is capacitively coupled to the
vertical amplifier . The dc component of input signal
is blocked . Low - frequency limit ( -3 db point ) is
approximately
2
Hz .
GND - Vertical amplifier input circuit is grounded
(
does not
ground
the
input signal
) .
Allows
precharging the
input
coupling capacitor
.
10 ) STEP ATTEN BAL - Screwdriver adjustment to
balance the vertical system for minimum trace shift
when
changing
deflection
factors .
16 18
DC - All frequency components of the input signal
are coupled to the vertical amplifier system .
( 11 ) Vertical POS - Controls the vertical position of the
appropriate
trace
.
17 19
( 12 ) VAR VOLTS / DIV - Provides a continuously variable
uncalibrated deflection factor between the calibrated
settings of
the
VOLTS / DIV
switch .
Figure 2-2 . Right side panel controls .
20
23
24
22
21
5054-03
2-3

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3C'"D H

OPERATING
POWER
INFORMATION
OPERATING CONSIDERATIONS
CAUTION
Due to the capacitive line input circuit , sudden voltage
changes
may
cause damaging input current
transients
.
Avoid
operating this
instrument from
square - wave inverter supplies , or other sources that
produce large voltage transients .
INTERNAL
BATTERY
OPERATION
The 214 is designed primarily for operation from the
internal
rechargeable
batteries . The
operating time
provided
from the
internal
batteries
depends
upon
trace
intensity
,
STORE
or
NONSTORE
mode , and
battery charge and
discharge temperature . Typical operating time from fully
charged batteries at maximum trace intensity in the
NONSTORE
mode of
operation ,
when
charged and
operated at + 20  C to + 30  C ( + 68  F to + 86  F ) , is four
hours
.
When
operated
in
the
STORE
mode
,
typical
operating time is three hours . Longest operating time
occurs
at
lower trace
intensity
.
The POWER ( BATTERY ) LED provides an indication of
the operating power of the 214. When the light extinguishes ,
battery charge is low and about five minutes of instrument
operating power remains . The 214 has an automatic battery
protection circuit to prevent excessive discharge and the
resulting battery damage if the battery charge level drops
below approximately 10 volts .
BATTERY CHARGING
REV APR 1985
The charging characteristics of the nickel - cadmium
( NiCd ) cells used in the 214 vary with the temperature at
which they are charged . Batteries charged at about + 20  C
to + 30  C (
+ 68  F to +
86  F )
deliver
more
energy
than
Operating
Information
214 Service ( SN B300000 & ABOVE )
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 eight hours for the batteries to reach full charge . For
longest operating life of the batteries , increase the charge
time to at least 16 hours once a month . This procedure
balances the charge on all the cells in the battery and
reduces the possibility of any individual cell becoming
reverse
charged .
The
nickel
-
cadmium
cells
will
self -
discharge
when
the
instrument is non - operational for extended periods of time .
The rate at
which
this
self -
discharge
occurs is
dependent on
the
ambient
temperature and
humidity
. If the
214 is to be
stored for
extended
periods
,
particularly at
either
high
ambient termperature or high humidity , it is recommended
that
the
batteries be
run
through a
full
charge
cycle
(
eight
hours ) about every two weeks .
AC OPERATION
If the
internal
batteries
of
the 214
become
discharged to
the minimum operating level , continued operation can be
obtained by
connecting the
instrument to an
AC
power
source . Due to the circuitry connected with the internal
battery charger , the AC power line voltage must be at least
104 volts (
110 volts
in
STORE
mode
)
for
operation in this
manner . Operation below 110 volts in the STORE mode will
result in a slow discharge of the internal batteries . The
internal
batteries
cannot
be
recharged
while
the
instrument
is
being
operated from
the AC line .
2-5

Operating
Information
214
Service
( SN
B300000 &
ABOVE )
INTENSITY
CONTROL
The
INTENSITY
control
determines the
brightness of
the
display
presented
on
the
CRT .
Since
the
brightness
of
the
CRT
display
affects
the
amount of
current
drained
from
the
batteries ,
the
INTENSITY
control
should
be
set to
the
minimum
usable
level .
This will
allow
maximum
operating
time
from the
internal
batteries
.
The
setting
of
the
INTENSITY
control
will
affect
the
focus
of
the display
in
the
STORAGE
mode of
operation
. Turn
the
INTENSITY
off
before
selecting
the
STORE
mode ,
then
slowly
increase
the
intensity
level for
the desired
display
brightness .
Careful
adjustment of
the Focus
adjustment at
the
desired
brightness
will
give
the
maximum
storage
writing
rate
.
NOTE
A
high
intensity
level
in
the
STORE
mode
will
cause
the
display to
spread
and
may
flood
the
CRT
screen
.
Slight
re -
adjustment of
the FOCUS
may be
necessary
when
changing
the
intensity
level
in
NONSTORE
operation
.
To
protect
the
CRT
phosphor
,
do not
turn
the
INTENSITY
higher
than
necessary
to
provide a
satisfactory
display
.
Also ,
be
careful
that
the
INTENSITY
control
is
not
set
too
high
when
changing
from
a fast
to a
slow
sweep
rate , or
when
changing
to
the X -
Y
mode of
operation
.
2-6
GRATICULE
The
graticule
of
the 214
is
internally
marked
on
the
faceplate
of
the
CRT
to
provide
accurate ,
parallax -
free
measurements .
The
graticule
is
marked
with
six
vertical
and
ten
horizontal
divisions
.
Each
major
division
is
divided into
five
minor
divisions at
the center
vertical
and
horizontal
lines .
The
vertical
gain
and
the
horizontal
timing
are
calibrated
to
the
graticule
so
that
accurate
measurements
can
be
made
directly
from
the
CRT display
.
CRT
CARE
The
following
precautions
will
prolong
the
useful
Storage
life of
the CRT
screen
in
the
214 :
1.
Use
the
minimum
beam
intensity
required
to
produce
a
clear ,
well -
defined
display
. A
too
-
high
beam
intensity
may
permanently
damage
the
CRT
screen ,
particularly if a
bright
spot
is
allowed
to
remain
stationary
on
the
display
area
.
2.
Avoid
the
repeated
use
of
the
same
area of the
screen
.
If
a
particular
display is
being
stored
repeatedly ,
change
the
vertical
position
occasionally
to
use other
portions of
the
display
area
.
3.
Do
not
leave a
Stored
display
on
the
screen
when it
is
no
longer
needed
.
4.
Operate
the
instrument
in
the
NONSTORE
mode
unless
Storage
is
required
.
SIGNAL
CONNECTIONS
Two
high -
impedance
signal
probes
are
internally
connected
to
the 214.
These
probes
provide
a 1
M
input
impedance
and a
shielded
input
cable
to
prevent
pickup
of
electrostatic
interference
.
The
vertical
deflection
factors
can
be
read
directly
from
the
appropriate
VOLTS /
DIV
switch
(
VAR
in
CAL
detent
) .
Signals
can
be
connected
to the
EXT
TRIG
banana
jack
with
short
unshielded
leads
under
most
conditions .
Be sure
to
establish
a
common
ground
between
the
214
and
the
equipment
under
test .
Attempt
to
position
the
unshielded
leads
away
from
any
source
of
interference
ot
avoid
errors
in
triggering
. If
interference is
excessive
with
unshielded
leads
,
use a
coaxial
cable
with
a
suitable
adapter
.
REV
APR 1985
C