Text preview for : SW503 .pdf part of Tektronix SW503 Tektronix SW503 .pdf



Back to : SW503 .pdf | Home

TENCT`Rt7IrV 1 ~~

sw~a~
SWEEP
GENERATaR

IIVSTFILICTION MAIti1L1AL
SW 503



TABLE OF CONTENTS
Section 1 DESCRIPTION Page
1 .1 INTRODUCTION 1-1

1 .2 ELECTRICAL CHARACTERISTICS 1-1
1 .3 ENVIRONMENTAL CHARACTERISTICS 1-2

Section 2 OPERATION
2.1 FRONT PANEL CONTROLS AND CONNECTORS 2-1

2.2 OPERATING INSTRUCTIONS AND NOTES 2-4
2.2 .1 General Setup and First-Time Operation 2-4

2.2 .2 Cable Connections 2-5

2.2 .3 Impedance Matching 2-5
2.2 .4 Detecting (Demodulating) 2-5
2.2 .5 Sweep Rate Effects 2-6
2.2 .6 Overloading Effects 2-6

2.2 .7 Low-Level Measurements 2-6

2.2 .8 TV Receiver Interference 2-6
2.2 .9 Use with Digital Counter 2-6
2.2 .10 Operation with X-Y Plotters 2-6

2.3 EXTERNAL CONTROL 2-7
2.3 .1 Frequency Control 2-7
2.3 .2 Amplitude Control 2-7

2 .3 .3 Trigger Control 2-7

WARNING

The remainder of this table of contents refers to servicing instructions which should be performed by
qualified personnel only .


Section 3 CALIBRATION
3.1 INTRODUCTION 3-1
3.2 EQUIPMENT REQUIRED 3-1
3.3 PRELIMINARY STEPS 3-2
3.4 PROCEDURE 3-2

Section 4 CIRCUIT DESCRIPTION
4.1 GENERAL 4-1

4.2 SWEEP RAMP GENERATOR 4-1

4 .2 .1 Basic Operation 4-1

4.2 .2 Ramp Generator 4-2

4.2 .3 Single Sweep 4-2

4.2 .4 Line Rate 4-3

4.2 .5 CW Mode 4-3
4.2 .6 MANuaI Mode 4-3
SW 503




TABLE OF CONTENTS (cont)
Section 4 CIRCUIT DESCRIPTION (cont) Page

4.3 SWEEP DRIVE CIRCUITRY 4-3
4.3 .1 Input Adder 4-3
4.3 .2 Ramp Shading Network 4-3
4.3 .3
4.3 .3 Output Amplifier 4-5
4.4 SWEEP OSCILLATOR MODULE 4-5
4.5 RF OSCILLATOR MODULE 4-5
4.6 HARMONIC MARKER MODULE 4-7
4.7 MARKER AMPLIFIER 4-7
4.8 COUNTER INTERFACE 4-9


Section 5 IMPLEMENTING SPECIAL FEATURES

5.1 CHANGING HORIZONTAL OUTPUT VOLTAGE 5-1
5.2 INTERFACE THROUGH REAR CONNECTOR 5-1
5.2 .1 Introduction 5-1
5.2 .2 Mainframe Modification 5-1
5.2 .3 Vertical Output and Horizontal Output 5-1
5.2 .4 External Frequency Control or Modulation 5-2
5.2 .5 External Amplitude Control or Modulation 5-2
5.2 .6 External Trigger 5-2
5.2 .7 Digital Counter Interface 5-3




Section 6 REPLACEABLE ELECTRICAL PARTS


OPTIONS


Section 7 DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS


Section 8 REPLACEABLE MECHANICAL PARTS


CHANGE INFORMATION
SW 503




LIST OF ILLUSTRATIONS

Page

Figure 1-1 SW 503 RF Sweep Generator Frontis
Figure 2-1 SW 503 Front Panel 2-2
Figure 2-2 Typical operating setup . 2-4
Figure 2-3 Typical resistive pads . 2-5
Figure 2-4 Basic detector schematic diagram . 2-5
Figure 2-5 Errors from sweep rate effects. 2-6
Figure 2-6 Markers selection switch location . 2-6
Figure 2-7 External control of frequency. 2-7
Figure 2-8 External control of amplitude. 2-7
Figure 3-1 SW 503 rear view . 3-2
Figure 3-2 SCOPE HORIZ waveform as seen on test oscilloscope . 3-2
Figure 3-3 SW 503 adjustment locations, left side . 3-3
Figure 3-4 SW 503 adjustment and test points locations, right side . 3-4
Figure 3-5 Normal interconnections for calibration . 3-4
Figure 4-1 SW 503 sweep ramp generator (simplified diagram) . 4-2
Figure 4-2 Ramp shaping network. 4-4
Figure 4-3 RF sweep oscillator module block diagram . 4-5
Figure 4-4 Harmonic comb markers block diagram . 4-6
Figure 4-5 Counter interface signals sequence . 4-8
Figure 5-1 Rear plug-in connector P40 interface wiring . 5-2




LIST OF TABLES

Table 5-1 Digital Counter Interface Lines 5-3
srrESr rron~rnrlr CTII Film ,-ae,r ~

' ., ,~~




1
w1A11 " ltl



sw LIKE
v" 2 3='-



I
1
"1
1
QfTECTfO
1
RS OAT All][ !!F


1
rr;law son IIIPIfT gplp2




~~^' ..T Cl1MTRUl~^- ~ 1
1
1
1
"
1
Flgure 1-1 . 5W 503 RF Sweep Generator.




5W SU3
Section 1-SW 503




' DESCRIPTION
1 .1 INTRODUCTION Frequency Sweep
The SW 503 is a TM 500-Series plug-in that provides a Maximum Width: Selectable ; 400 MHz (+10% - 0%)
swept frequency of 1 MHz to 400 MHz with variable sweep
rate, width, and output level. Crystal-controlled harmonic
oscillators provide comb markers with 1 MHz, 10 MHz, or
Variable : Permits reducing sweep width from maximum
50 MHz separation . When used with a DC 502 Option 7 dca+aose tt3 ag