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TEKTRONIX
INSTRUCTION MANUAL
Tektronix, Inc .
P .Q . Box 500
Beaverton, Oregon 97077 Serial Number
O10-1984-00 First Printing APR 1915
DC 505A
TABLE
OF CONTENTS
SECTION 1 OPERATING INSTRUCTIONS Page
INTRODUCTION 1-1
Installation 1-1
OPERATIONAL CHECK 1-2
Controls and Connectors 1-2
Display Tests 1-2
INPUT CONSIDERATIONS 1-4
Input Sources 1-4
Input Coupling 1-4
Attenuators and Maximum Input Volts 1-4
Sensitivity and Frequency Range 1-4
Slope and Level 1-4
FREQUENCY MEASUREMENTS 1-5
Frequency A 1-5
Triggering 1-5
Measurement Intervals 1-5
Measurement Rate 1-5
RATIO MEASUREMENTS 1-6
Triggering 1-6
Resolution 1-6
PERIOD MEASUREMENTS 1-6
Gating 1-6
Averag ing 1-6
Low Frequencies 1-6
TIME INTERVAL MEASUREMENTS 1-6
General 1-6
Width B Mode 1 -~
Time A--B Mode
Time Interval Averaging 1-8
Single-Shot using HOLD 1-8
EVENT MEASUREMENTS 1-8
Averag ing 1-8
TOTALIZING 1-9
Purpose 1-9
Operation 1-9
FUNCTIONS AVAILABLE AT REAR CONNECTOR 1-10
Customizing the Interface 1-10
Control Lines 1-1~
Signal Lines 1-1~
DC 505A
TABLE OF
CONTENTS (cont)
SECTION 1 OPERATING INSTRUCTIONS (cont) Page
ELECTRICAL CHARACTERISTICS
Performance Conditions 1-11
Table t-6 Channels A & B Input 1-11
Table 1-7 Display Resolution and Accuracy 1-12
Table 1-8 Internal Time Base 1-14
Table 1-9 Display 1-15
Table 1-10 Outputs 1-15
Table 1-11 Environmental 1-16
SECTION 2 THEORY OF OPERATION
INPUT AND TRIGGER 2-1
AC/DC Selection, Attenuators, and Coupling, CH A & (B) 2-1
Input Amplifier, Signal Shaping, Slope Selection and
Output 2-1
Signal Selection 2-1
Time A-B 2-1
AVERAGING AND CONTROL 2-2
Averaging Divider 2-2
Gate and Control Logic Generator 2-2
Phase Lock Loop 2-3
COUNTERS, DISPLAY MULTIPLEXING, TIME BASE AND
PARAMETER SELECTION 2-3
10