Tektronix 314 User manual

Toktronix, inc.
P.O. [lox 500
Beaverton, Oregon 97077

314 Service
TABLE OF CONTENTS
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SECTION 1 SPECIFICATION
Electrical Characteristics
Vertical
Horizontal System
Triggering System
Calibrator
External Horizontal lnput
External Blanking
CRT Display System
Storage System
Power Sources
Environmental Characteristics
Physical Characteristics
SECTION 2 OPERATING INFORMATION
Preliminary Information
Safety lnformation
Operating Voltage
Controls and Connectors
Front Panel
Side Panel
Rear Panel
SECTION 3 THEORY OF OPERATION
Block Diagram
Description
Vertical Amplifier
Triggering
Sweep Generator
CRT and Power Supply
Calibrator
Circuit Operation
CH 1 Preamp and Calibrator
General
lnput Coupling
lnput Attenuator
5 Division Calibrator
lnput Stage
Preamp Stage
CH
2 Preamp
General
Preamp Stage
Channel Switch
General
Diode Gates
Switching Multivibrator
Current Limiter
Delay-Line Driver
Vertical Output Amplifier
General
Delay Line
Output Amplifier
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Page
1-1
1-1
1-2
1-3
1-3
1-4
1-4
1-4
1-4
1-5
1-5
1-6

314 Service
TABLE OF CONTENTS (cont)
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SECTION 3 THEORY OF OPERATION (cont) Page
Trigger Source 3-9
Internal 3-9
Source and Coupling 3-9
Trigger Preamp and Sweep Generator 3-10
Trigger Preamplifier 3-10
Sweep Generator 3-10
Normal Triggered Mode 3-13
Auto-Triggered Mode 3-13
Single Sweep Mode 3-13
Sweep Magnification and Positioning 3-14
Ext Horiz 3-14
General 3-14
Input Stage 3-14
Output Stage 3-14
Horizontal Amplifier 3-14
General 3-14
Emitter-Follower Amplifier 3-14
Common-Base Amplifier 3-14
Output Amplifier and Output Inverter Amplifier 3-14
Storage 3-15
General 3-15
Storage Tube 3-15
Flood Guns and Collimation Electrodes 3-17
Target-Control Amplifier 3-17
Erase Generator 3-17
Enhance Generator 3-18
Auto Erase 3-18
Auto-Erase Generator 3-18
Sweep Reset Delay Multivibrator 3-18
Integrate 3-19
Power Supply 3-19
General 3-19
AC Power Input 3-19
Power Source Selector 3-20
Series Regulator 3-20
DC-to-DC Converter 3-20
Regulator Protection 3-20
Auto Turn Off 3-20
Low-Line Indicator 3-20
+6 V and -6 V Regulator 3-20
H V and Unblanking 3-20
General 3-20
High Voltage and CRT 3-20
Blanking and Unblanking 3-22
SECTION 4 MAINTENANCE
Preventive Maintenance 4-1
Cleaning 4-1
Visual Inspection 4-1
Semiconductor Checks 4-1
Recalibration 4-1
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314 Service
TABLE OF CONTENTS (cont)
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SECTION 4 MAINTENANCE (cont) Page
Troubleshooting 4-1
Troubleshooting Chart 4-
1
Troubleshooting Techniques 4-4
Corrective Maintenance 4-5
Obtaining Replacement Parts 4-5
Component Removal and Replacement 4-6
Instrument Cabinet 4-6
Storage-Time/Div Module 4-6
CRT (with power supply section of instrument in
place) 4-6
Power Supply-High Voltage Section 4-7
Interface Circuit Board (Assembly A8) 4-8
Power Supply Circuit Board (Assembly A7) 4-8
H V and Unblank Circuit Board (Assembly A6) 4-9
Storage Circuit Board (Assembly A5) 4-9
Horizontal Circuit Board (Assembly A4) 4-10
Attenuator Circuit Board (Assembly Al) 4-10
Vertical Circuit Board (Assembly A2) 4-11
Trigger Switch Circuit Board (Assembly A3) 4-1
2
Circuit Board Pins 4-1 2
Circuit Board Pin Sockets 4-1 2
Lead-End Pin Connectors 4-13
Recalibration After Repairs 4-13
Instrument Repackaging 4-13
SECTION 5 PERFORMANCE CHECK/CALIBRATION
Performance Check
Introduction
Using the Procedure
lndex
Partial Procedure
Control Settings
Test Equipment Required
Special Calibration Fixtures
Calibration Equipment Alternatives
lndex to Performance Check
Power Supply and Display
Vertical System
Horizontal System
Triggering System
Storage System
Miscellaneous
Calibration Procedure
Calibration Interval
Tektronix Field Services
Using the Procedure
lndex
Calibration Procedure
Partial Procedure
lndex to Adjustment Procedure
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314 Service
TABLE OF CONTENTS (cont)
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SECTION 5 PERFORMANCE CHECK/CALIBRATION (cont) Page
Power Supply and Calibrator 5-18
Display 5-20
Storage 5-22
Vertical System 5-24
Horizontal System 5-28
SECTION 6 ELECTRICAL PARTS LIST
SECTION
7 DIAGRAMS
SECTION
8
MECHANICALPARTSLISTAND ILLUSTRATIONS
CHANGEINFORMATION
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LlST OF ILLUSTRATIONS
Figure No. Page
Sony-Tektronix 314 Storage Oscilloscope
Dimensions
Locations of controls and connectors Front Panel
Locations of controls and connectors Side Panel
Locations of controls and connectors Rear Panel
Basic Block Diagram
CH
1 Preamp Circuit Block Diagram
CH
2 Preamp Circuit Block Diagram
Channel Switching Block Diagram
Signal Path, CH
1
Signal Path, CH 2
Vertical Output Amplifier Block Diagram
Trigger Source Block Diagram
Sweep Generator and External Horizontal Block Diagram
Horizontal Amplifier Block Diagram
Storage Block Diagram
Power Supply Block Diagram
CRT
& H V Block Diagram
Troubleshooting Chart
Location of Power Supply Test Points
Location of Connectors
Location of Screws HoldingPowerSupply Section to Main Chassis
Location of 8-Pin Connector in Power Supply
Location of Hexagonal Spacers on Interface Board
Location of Screws Holding Heat-Sink Bracket
Location of Screws Near Focus and Intensity Controls
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REV. A, AUG. 1975

31 4 Service
LIST OF ILLUSTRATIONS (cont)
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Location of Screws on Power Supply Section 4-9
Location of Screws Holding Storage Circuit Board to Module 4-9
Location of Screws Holding Horizontal Circuit Board to Module
Assembly 4-10
Locationof Interconnectingand GroundLeadsBetweenAttenuator
and Vertical Circuit Boards 4-11
Location of Screws Holding Attenuator Circuit Board to Chassis 4-11
Location of Delay Line Leads 4-11
Location of Screws and Spacers Holding Trigger Circuit Board 4-12
Idealized Display of Risetime 5-8
Calibration Shield in place on 314 5-26
Typical display of correct adjustment of C1 or C11 5-26
Display of correct high-frequency compensation (idealized) 5-27
Typical display of external XI0attenuatorcompensation (idealized) 5-29
Semiconductor Lead Configurations
Circuit Board Locations
Adjustment Locations
Adjustment Locations
Adjustment Locations
Adjustment Locations
Al-Attenuator Board
A2-Vertical Amplifier Circuit Board
A3-Trigger Switch Circuit Board
A4-Horizontal Circuit Board
A5-Storage Circuit Board
A7-Power Supply Circuit Board
A8-Interface Circuit Board
A6-H V and Unblanking Circuit Board
AS-Intensity Limit Circuit Board
LIST OF TABLES
Table No.
1-1 Characteristics
2-1 Power Cord color codes
3-1 Sweep Generator IC Input-Output
4-1 Voltage and Ripple Tolerances
5-1 Test Equipment
5-2 Volts/Div Accuracy
5-3 Time/Div Accuracy (unmagnified)
5-4 Time/Div Accuracy (magnified)
5-5 Trigger Levels
5-6 Volts/Div Compensation
Page
1-1
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REV. B, FEB. 1976

Fig. 1-1. $my-Toktronix 314 Storb$$@ Oscilloscope.
314 Service

Section 1-314 Service
SPECIFICATION
The Sony-Tektronix 314 is a dual-channel, 10
megahertz, portablestorageoscilloscope.Theinstrument
isconstructed to withstand awide rangeof environmental
conditions.
Dc to 10 megahertz vertical bandwidth provides
calibrated deflection factors from 1 millivolt to 10
volts/division.
The horizontal system provides calibratedsweep rates
from 5 seconds to 1 microsecond/division and a XI0
sweep magnifier to increase the fastest sweep rate to 0.1
microsecond/division. Three sweep modes are available:
AUTO, NORM, and SINGLE SWP. The trigger circuit
provides a stable display over the full bandwidth.
External horizontal inputprovidesdeflection factors of
20 millivolts to 2 volts/division for external sweep signal.
The crt is a direct-view, bistablestorage device having
an 8xlodivisioninternalgraticule.Eachgraticuledivision
equals 0.25-inch. An enhance mode increases single-
sweep writing rate.
The internal 1 kilohertz calibrator is connected inter-
nallytothevertical inputsand to afront-panel connector.
The 314 operates from a line voltage of 100, 115, 120,
200, 230, or 240 volts ac, or from a +12- or +24-volt dc
source. The following tables contain a detailed listing of
the 314 characteristics.
TABLE 1-1
Electrical Characteristics
Deflection Factor
Characteristic
Calibrated Range
Accuracy
Uncalibrated Range
(VOLTS/DIV VARIABLE)
VERTICAL
Performance Requirement
Frequency Response
Supplemental Information
Bandwidth
Direct Coupled,
4-div reference
Capacitively Coupled,
4-div reference
Step Response
Risetime, 4-division
Step Input
1 mV to 10 V/Div
Within 3% over the calibrated range
Continuously variable between calibrated
deflection factor settings. Extends
highest deflection factor to at
least 25 V/Div.
13 steps in a 1-2-5 sequence
REV. A. AUG. 1977
1 mV to 10 V/Div with
VARIABLE at CAL
1 mV to 10 V/Div with
VARIABLE at CAL
Without Probe
At least
10 MHz
10 Hz or less
to at least
10 MHz
36 ns or less
With P6149 Probe
At least
10 MHz
1 Hz or less to
at least
10 MHz
1 mV to 10 V/Div

Specification-31 4 Service
TABLE 1-1 (cont)
Capacitively Coupled (AC)
Supplemental Information
- - -
Characteristic
Maximum Input Voltage
Direct Coupled (DC)
lnput R and C
Resistance
-- -- - - - -
Performance Requirement
Without Probe I With P6149 Probe
1 Mn,within 2% 10 Mn,within 2%
300 V, dc plus
peak ac
Capacitance
1 47 pF. within 4 pF 13.5 pF or less 1
500 V, dc plus
peak ac
Signal Delay Permits viewing leading edge of
waveform that initiates trigger
HORIZONTAL SYSTEM
Chopped Repetition Rate
Sweep Time/Div
Calibrated Range
Accuracy
Unmagnified
5 s to 0.5 s/Div
0.2 s to 1ps/Div
Magnified
0.5 s to 50 ms/Div
20 ms to 0.5 ps/Div
0.2 ps and
0.1 pslDiv
TIME/DIV Variable
1-2
Approximately 100 kHz
5 s to 1ps/Div. XI0 magnifier
extends sweep time/div to 0.1 ps
Within 4% over center
8 graticule
divisions. Within 5% over any
2
division interval within center
8 divisions.
Within 3% over center
8 graticule
divisions. Within 4% over any 2
division interval within center
8 divisions.
Within 5% over center
8 graticule
divisions. Within 6% over any 2
division interval within center
8 divisions.
Within 4% over center
8 graticule
divisions. Within 5% over any
2
division interval within center
8 divisions.
Within 5% over center
8 graticule
divisions. Within 6% over any 2
division interval within center
8 divisions, excluding first and
last 2 divisions of magnified sweep.
At least 2.51
21 steps in a 1-2-5 sequence
REV. A, AUG. 1977