Tektronix 214 User manual

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.
Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077
070-1483-00
214
STORAGE
OSCILLOSCOPE
SERVICE
INSTRUCTION MANUAL
Serial Number
First Printing AUG 1973
Revised APR 1981

http://manoman.sghill.com
Q ©
“ip x < a t -
. ; o 1 i
. Printed in U.S.A. Specification and price change
privileges are reserved.

SECTION 1
SECTION 2
TABLE OF CONTENTS
INTRODUCTION
General Information
Specifications
Vertical Deflection System
Triggering
Horizontal Deflection System
Display
Isolation
AC Operation
Internal Battery Operation
Environmental
Physical
FUNCTIONS OF CONTROLS AND CONNECTORS
Front Panel Controls
Side Panel Controls
SECTION 3 MAINTENANCE
REV APR 1981
Introduction
Preventive Maintenance
General
Cleaning
Lubrication
Visual Inspection
CRT Care
Recalibration Information
Disassembly Instructions
Troubleshooting
Introduction
Troubleshooting Aids
Troubleshooting Equipment
Corrective Maintenance
Obtaining Replacement Parts
Component Replacement
Recalibration After Repair
Instrument Repackaging
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214 Service

214 Service
TABLE OF CONTENTS (cont)
SECTION 4 CALIBRATION
General
Test Equipment Required
Special Calibration Fixtures
Preliminary Procedure
Preliminary Control Settings
Power Supply and Display
Check Power Supply DC Levels
Adjust CRT Grid Bias
Adjust FOCUS
Adjust Trace Rotation
Adjust Storage Operating Level
Adjust Wall Band Level
Adjust Enhance Level
Adjust Hum Balance
Vertical System
Adjust Vertical DC Centering
Adjust Channel 1 Step Attenuator Balance
Adjust Channel 2 Step Attenuator Balance
Adjust Vertical Gain
Adjust Storage Vertical Gain
Check Channel 2 Variable Volts/Division Range
Check Channel 2 Volts/Division Accuracy
Check Input Coupling Switches
Check CH 1 Volts/Division Accuracy and
Variable Volts/Division Range
Check Channel 1 Volts/Div Compensation
Check Channel 2 Volts/Div Compensation
Check Vertical Amplifier Bandwidth
Trigger Circuit
Adjust AUTO PRESET Level
Check Trigger Circuit Operation
Check Single Sweep Operation
Horizontal System
Adjust Horizontal Centering
Adjust Horizontal Gain
Adjust Sweep Calibration
Check Variable Horizontal Magnifier Range
Check SEC/DIV Accuracy
REV. APR 1974
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@1

REV. C, OCT. 1975
TABLE OF CONTENTS (cont)
SECTIONS TROUBLESHOOTING AIDS
Diagram Information
Component Color Coding
Troubleshooting Equipment
SECTION6 CIRCUIT DESCRIPTION
Block Diagram Description
Circuit Operation
Vertical Input Amplifiers
Vertical and Horizontal Output Amplifiers
Trigger Generator
Sweep Generator
Single Sweep
Storage
Power Supply
CRT Circuit
SECTION 7 DELETED
(INFORMATION NOW INCORPORATED IN SECTION 3)
SECTION 8 ELECTRICAL PARTS LIST
OPTION INFORMATION
SECTION9 DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS
SECTION 10 MECHANICAL PARTS LIST
CHANGE INFORMATION
Page
5-1
5-1
5-1
6-1
6-1
6-3
6-3
6-3
6-3
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6-4
6-7
6-9
214 Service

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Tektronix 214 Storage Oscilloscope.
214 Service

Section 1—214 Service
INTRODUCTION
GENERAL INFORMATION
The Tektronix 214 Storage Oscilloscope is a solid-state
portable instrument that combines small size and light
weight with the ability to make precision waveform
measurements. It is designed for general-purpose applica-
tions where display storage is desired, along with conven-
tional (NONSTORE) operation. The instrument is
mechanically constructed to withstand the shock, vibration,
and other extremes associated with portability.
The dual-channel DC-to-500 kilohertz vertical system
provides vertical deflection factors from one millivolt (at a
reduced bandwidth) to 50 volts/division at the tip of either
of the integral high-impedance probes. The 214 will either
automatically chop or alternate, depending upon the sweep
rate. Single-trace operation is achieved by turning off either
channel with its position control. Single Sweep operation is
provided to display infrequently recurring events. The
trigger circuit provides stable triggering over the full range
of vertical frequency response.
The horizontal deflection system provides calibrated
sweep rates from 500 milliseconds to five microseconds/
division. Uncalibrated sweep rates, via a variable sweep
magnifier, are available to at least five times the indicated
sweep rate for a maximum of at least one microsecond/
division. Stored Automatic Enhance occurs (in the Single
Sweep mode) at sweep rates of 0.1 millisecond/division and
faster.
X-Y operation is provided with Channel 1 supplying the
horizontal deflection of the applied (X) signal, with a range
from less than one millivolt to 50 volts/division (at a
reduced bandwidth of 50 kilohertz). Channel 2 supplies the
vertical deflection of the applied (Y) signal.
The cathode-ray tube (CRT) is a direct-view bistable
Storage tube having a 6 X 10 division graticule (each
division equals 0.203 inch).
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).
®
This instrument will meet the following electrical charac-
teristics after complete instrument calibration. These char-
acteristics apply over an ambient temperature range of
—15°C to +55°C (+5°F to +131°F) when operating from
the internal batteries, and 0°C to +40°C (+32°F to +104°F)
when operating from an AC line source, except as otherwise
indicated. Warmup time for given accuracies is five minutes.
SPECIFICATIONS
Vertical Deflection System
DEFLECTION FACTOR:
Calibrated Range: One millivolt to 50 volts/division. 15
steps in a 1-2-5 sequence.
Accuracy: Within 5% with VAR VOLTS/DIV control in
CAL position and gain correctly set at five millivolts/
division.
Uncalibrated (variable) Range: Continuously variable
between calibrated settings. Extends maximum deflection
factor to at least 125 volts/division.
BANDWIDTH (using six-division reference):
10 mV/DIV to 50 V/DIV: DC to at least 500 kilohertz.
5 mV/DIV: DC to at least 400 kilohertz.
2 mV/DIV: DC to at least 200 kilohertz.
1 mV/DIV: DC to at least 100 kilohertz.
Lower Bandwidth Limit, AC (capacitively) Coupled:
About two hertz at all deflection factors.
INPUT RESISTANCE: One megohm, within 5%.
INPUT CAPACITANCE:
1 mV/DIV to 50 mV/DIV: Approximately 160 pico-
farads.
100 mV/DIV to 50 V/DIV: Approximately 140 pico-
farads.
1-1

Introduction—214 Service
MAXIMUM USABLE INPUT VOLTAGE:
50 V/DIV to 0.1 V/DIV: 600 volts (DC + peak AC). 600
volts peak-to-peak AC (five megahertz or less).
50 mV/DIV to 1 mV/DIV: 600 volts (DC + peak AC).
AC not over two kilohertz or risetime not less than 100
nanoseconds.
CHOPPED MODE: From 500 ms/DIV to 2 ms/DIV of time
rate at approximately 40 kilohertz.
ALTERNATE MODE: From 1 ms/DIV to 5 us/DIV of time
rate,
INPUT IMPEDANCE MATCHING: Matched to within
10%.
GAIN ACCURACY BETWEEN CHANNELS: Within 5%
with both VAR VOLTS/DIV controls in CAL position and
gain correctly set at 5 mV/DIV.
Triggering
TRIGGER SENSITIVITY:
Internal:
COMP: 0.2 division from DC to 500 kilohertz.
CH 2: 0.2 division from 2 hertz to 500 kilohertz.
External: At least one volt from DC to 500 kilohertz.
PRESET TRIGGER LEVEL: Triggered at preset level on
positive slope of triggering signal. Sensitivity same as stated
above.
DISPLAY JITTER: 0.5 microsecond or less at 500 kilo-
hertz.
EXTERNAL TRIGGER:
Input Resistance: Approximately one megohm.
Input Capacitance: Approximately 30 picofarads.
Maximum Usable Input Voltage: Eight volts (DC + peak
AC). 16 volts peak-to-peak AC (one megahertz or less).
1-2
Horizontal Deflection System
SWEEP RATE:
Calibrated Range: 500 milliseconds to five micro-
seconds/division. 16 steps in 1-2-5 sequence.
Accuracy (over center eight divisions): Within 5% with
VAR HORIZ MAG control in CAL position and timing
correctly set at 1 ms/DIV (disregard first 0.5 microsecond
of sweep length).
Linearity (any two division portion within center eight
divisions): Within 5% (disregard first 10% of total sweep
length).
Variable Magnifier; Continuously variable between cali-
brated settings. Extends maximum sweep rate to at least
one microsecond/division.
CH 1 HORIZONTAL INPUT:
Calibrated Deflection Factor: One millivolt to 50 volts/
division.
Variable: At least five times magnification (using VAR
HORIZ MAG).
Accuracy: Within 10% (with VAR HORIZ MAG in
CAL).
X-Y Phasing: Less than 3° to five kilohertz.
Maximum Input Voltage: Same as for CH 1 (vertical).
Display
GRATICULE:
Type: Internal Black line, non-illuminated.
Area: Six divisions vertical by 10 divisions horizontal.
Each division equals 0.203 inch.
Stored Writing Speed
At least 80 divisions/millisecond. At least 500 divisions/
millisecond in Automatic Enhance (internal adjustment).
Isolation
INPUT COMMON TO 214 CASE EXTERIOR: (When
battery operated with AC power plug secured in the
insulated cover.) Maximum floating potential between
input common and 214 case exterior is not to exceed 500
volts RMS sinusoidal or 700 volts (DC + peak AC).
INPUT COMMON TO AC LINE: Maximum floating voltage
plus AC line voltage is not to exceed 250 Volts RMS
REV. B, AUG. 1974

sinusoidal, or 1.4 times the AC line voltage plus (DC + peak
AC) is not to exceed 350 volts
CAUTION
Due to the capacitive line input circuit, sudden volt-
age changes may cause damaging input current
transients. Avoid operating this instrument from
square-wave inverter supplies, or other sources that
produce large voltage transients.
AC Operation
LINE VOLTAGE RANGE:
Stored Mode: 110 to 126 volts AC. Batteries can not be
charged during AC operation. Instrument can be operated
between 104 and 110 volts with resulting slow discharge of
internal batteries.
Nonstore Mode: 104 to 126 volts AC. Instrument can be
operated without resulting discharge of internal batteries.
LINE FREQUENCY: 58 to 62 hertz.
NOTE
Refer
to
Option
and
Maintenance
information
for
other
Line
Voltages
and
Frequencies.
MAXIMUM POWER CONSUMPTION: Three watts or less
at 126 volts, 60 hertz.
Introduction—214 Service
Internal Battery Operation
BATTERIES: 10 rechargeable A size, nickel-cadmium cells.
CHARGE TIME (from AC line): 8 hours for full charge
(instrument off during charge cycle).
POWER (BATTERY) INDICATOR: When extinguished
indicates approximately five minutes of scope operating life
left in the batteries.
BATTERY EXCESSIVE DISCHARGE PROTECTION: In-
strument operation automatically interrupted when battery
charge drops to 10 volts, +0.5 volt.
TYPICAL OPERATING TIME (at maximum trace intensity
after full charge cycle at +20°C to +30°C):
NONSTORE Mode: 3.5 to five hours. Longest operating
time provided at lower trace intensity.
STORE Mode: 2.5 to 3.5 hours. Longest operating time
provided at lower trace intensity.
TYPICAL CHARGE CAPACITY (in reference to charge/
discharge at +20°C to +30°C or +68°F to +86°F) See
Table 1-1.
TABLE 1-1
Operating Temperature
+20°C to +30°C
Charge Temperature —15°C (+5°F) (+68°F to +86°F) +55°C (+131°F)
O°C (+32°F) 40% 60% 50%
+20°C to +30°C (+68°F to +86°F) 65% 100% 85%
+40°C (+104°F) 40% 65% 55%
REV.C, APR. 1976
1-3

Introduction—214 Service
Environmental
Temperature:
Operating from Batteries, —15°C to +55°C (+5°F to
+131°F)
Operating from AC Line, 0°C to +40°C (+32°F to
+104°F)
Non-Operating, —40°C to +60°C (—40°F to +140°F)
Altitude:
Operating, to 25,000 feet (maximum operating tem-
perature decreased by 1°C per 1,000 feet above 15,000
feet).
Non-Operating, to 50,000 feet.
Humidity (operating and non-operating): five cycles
(120 hours) to 95% relative humidity in reference to
MIL-E-16400F.
Shock (operating and non-operating): Tested with two
shocks at 150g, one-half sine, two millisecond duration
each direction along major axes.
Physical
WEIGHT (without accessories): 3.5 pounds (1.6 kilograms)
DIMENSIONS (measured at maximum points):
Height; 3.0 inches (7.6 centimeters)
Width: 5.25 inches (13.2 centimeters)
Depth: 9.5 inches (24.1 centimeters)