Tektronix 475A User manual

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Tektronix, inc.
P.O. Box 500

WARRANTY
All TEKTRONIX instruments are warranted against defective materials and workmanship for
one year. Any questions with respect to the warranty should be taken up with your
TEKTRONIX Field Engineer or representative.
All requests for repairs and replacement parts should be directed to the TEKTRONIX Field
Office or representative in your area. This will assure you the fastest possible service. Please
include
the
instrument
Type
Number
or
Part
Number
and
Serial
Number
with
all
requests
for
parts or service.
Specifications and price change privileges reserved.
Copyright © 1976 by Tektronix, Inc., Beaverton, Oregon. Printed in the United States of
America. All rights reserved. Contents of this publication may not be reproduced in any form
without permission of Tektronix, Inc.
U.S.A. and foreign Tektronix products covered by U.S. and foreign patents and/or patents
pending.
TEKTRONIX is a registered trademark of Tektronix, inc.

TABLE OF CONTENTS
Page
LIST OF ILLUSTRATIONS iv BASIC OSCILLOSCOPE DISPLAYS
OP å NORMAL SWEEP DISPLAY
MAGNIFIED SWEEP DISPLAY
BEFORE
OPERATING
1
DELAYED
SWEEP
DISPLAY
INTRODUCTION 1 MIXED SWEEP DISPLAY
SAFETY INFORMATION 1 Dee ene
OPERATING VOLTAGE 1 SINGLE SWEEP DISPLAY
Line Voltage Selection 2
Regulating Range Selection 2 DM44 DISPLAYS AND MEASUREMENTS
OPTIONS 3
5 RESISTANCE
CONTROLS, CONNECTORS, AND VOLTS
INDICATORS 4 TEMPERATURE
VERTICAL 4 Accuracy Check
DISPLAY 7 TIME AND 1/TIME
DM44 7 :
TRIGGER 8
HORIZONTAL,
CALIBRATOR,
AND
POWER
12
APPLICATIONS
AND
MEASUREMENTS
REAR PANEL 14 PRELIMINARY
LEFT SIDE PANEL 14 Signal Ground
RIGHT SIDE PANEL 14 input Coupling Capacitor Precharging
475A/DM44 Operators
Page
16
16
17
7
18
18
19
20
20
22
24
24
27
28
28
28
28

APPLICATIONS AND MEASUREMENTS (cont)
TABLE OF CONTENTS (cont)
Page
OPERATOR’S ADJUSTMENTS AND CHECKS 29
Trace Rotation
Probe Compensation
Vertical Gain Check
Basic 475A Timing Check
DM44 Timing Check
External Horizontal Gain Check
PEAK-TO-PEAK VOLTAGE
MEASUREMENTS—AC
INSTANTANEOUS VOLTAGE
MEASUREMENTS—DC
ALGEBRAIC ADDITION
COMMON MODE REJECTION
AMPLITUDE COMPARISON
MEASUREMENTS
TIME-DURATION MEASUREMENTS
FREQUENCV MEASUREMENTS
RISETIME MEASUREMENTS
TIME DIFFERENCE BETWEEN TWO
PULSES FROM DIFFERENT SOURCES
TIME COMPARISON MEASUREMENTS
29
29
30
30
30
31
31
32
34
35
36
37
38
39
40
41
475A/DM44 Operators
APPLICATIONS AND MEASUREMENTS (cont)
PHASE DIFFERENCE MEASUREMENTS
HIGH RESOLUTION PHASE DIFFERENCE
MEASUREMENTS
PULSE JITTER MEASUREMENTS
DELAYED OR MIXED SWEEP
MAGNIFICATION
Magnified Sweep Starts After Delay
Triggered Delay Sweep Magnification
Page
42
43
44
45
45
46
BASIC 475A DELAYED OR MIXED SWEEP TIME
MEASUREMENTS
TIME DIFFERENCE BETWEEN REPETITIVE
PULSES (BASIC 475A)
TIME DURATION MEASUREMENTS
(BASIC 475A)
48
48
49
FREQUENCY MEASUREMENTS (BASIC 475A) 50
TIME DIFFERENCE BETWEEN TWO PULSES
FROM DIFFERENT SOURCES (BASIC 475A) 51
RISETIME (BASIC 475;
MIX {BASIC 475A)
52
53

TABLE
OF
CONTENTS
(cont)
DM44
DELAYED
OR
MIXED
SWEEP
TIME
MEASUREMENTS
Page
54
TIME DIFFERENCE BETWEEN REPETITIVE
PULSES (DM44)
56
TIME
DURATION
MEASUREMENTS
(DM44)
57
FREQUENCY
MEASUREMENTS
(DM44)
58
TIME DIFFERENCE BETWEEN TWO PULSES
FROM DIFFERENT SOURCES (DM44)
RISETIME (DM44)
MIX (DM44)
OPERATOR'S SPECIFICATIONS
475A OSCILLOSCOPE
VERTICAL
TRIGGERING
DIFFERENTIAL TIME MEASUREMENT
(BASIC 475A)
DIFFERENTIAL TIME MEASUREMENT
(DM44)
HORIZONTAL
X-Y
CALIBRATOR
58
60
64
62
62
62
63
63
64
64
64.
64
OPERATOR'S SPECIFICATIONS (cont)
Z AXIS INPUT
OUTPUTS
AG POWER SOURCE
ENVIRONMENTAL
DM44 DIGITAL MULTIMETER
RESISTANCE
TIME
1/TIME
TEMPERATURE
DC VOLTAGE
ACCESSORIES
STANDARD ACCESSORIES
OPTIONAL ACCESSORIES
OPTIONS
OPTION 4
OPTION 7
475A/DM44 Operators
Page
65
65
65
65
66
66
66
66
66
66
68
68
68
69
69
69

Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
10,
11.
12.
13.
14,
15.
16.
LIST OF ILLUSTRATIONS
Regulating range selector and line
fuse.
Vertical controls, connectors, and
indicators.
Display and DM44 controls,
connectors, and indicators.
Trigger controls, connectors, and
indicators.
Trigger controls, connectors, and
indicators.
Horizontal, calibrator, and power
controis, connectors, and indicators.
Rear pane! and left side panei controls,
connectors, and indicators.
Resistance.
Volts.
Temperature.
Probe compensation.
Basic 475A timing check.
DMAA timing check.
Peak-to-peak voltage of a waveform.
Instantaneous voltage measurements.
Algebraic addition.
Page
15
21
23
25
29
30
31
32
33
35
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32,
475A/DM44 Operators
Common-mode rejection.
Time duration.
Risetime.
Time difference between two pulses
from different sources.
Phase difference.
High-resolution phase difference.
Pulse jitter.
Delaved sweep magnification.
Time difference between tepetitive
pulses.
Time duration.
Time difference between two pulses
from different sources.
Risetime.
Time difference between repetitive
pulses.
Time duration and frequency
measurements,
Time difference between two pulses
from different sources.
Risetime. i
Page
36
38
39
40
43
43
44
46
49
50
51
53
56
57
59 kol
60 |

LIST OF TABLES
Page
Page
TABLE
1
Regulating
Ranges
2
TABLE
4
Centigrade
to
Fahrenheit
Conversion
26
TABLE
2
Resistance
Ranges
20
TABLE
5
DM44
Delayed
Sweep
Displays
54
TABLE
3
Volts
Ranges
22
475A/DM44
Operators
v

475A Oscilloscope with DM44 Digital Multimeter.
475A/DM44 Operators
2163-02

BEFORE OPERATING
INTRODUCTION
The Tektronix 475A Oscilloscope is a dual-channel
portable instrument. The dual-channel dc-to-250 MHz
vertical system provides calibrated deflection factors from
5 miltivolts to 10 volts/division. The sweep trigger circuits
are capable of stable triggering over the full bandwidth
capabilities of the vertical deflection system. The horizon-
tal deflection system provides calibrated sweep rates from
0.5 second to 0.01 microsecond/division along with
delayed sweep features for accurate relative-time
. measurements. A X10 magnifier extends the calibrated
sweep rate to 1 nanosecond/division. The instrument
operates over a wide variation of line voltages and
frequencies. Maximum power consumption is about 100
watts. z.
The Tektronix DM44 Digital Multimeter measures 0
ohm to 20 megohms, 0 dc volt to 1200 dc volts (+ or —), or
(using the temperature probe) ~55°C to +150°C. The
measurement is displayed on a 3-1/2 digital display while
the oscilloscope operates normally.
The digital multimeter and oscilloscope combine to
provide a digital readout of the time between any two
points on the oscilloscope display. Both time measure-
ment points are displayed on the crt at the same time. The
1/TIME function can provide direct measurement of
frequency.
SAFETY INFORMATION
The instrument is designed to operate from a single-
phase power source with one of the current-carrying
conductors (the Neutral Conductor) at ground (earth)
potential. Operation from power sources where both
current-carrying conductors are live with respect to
ground (such as phase-to-phase on a three-wire system)
is not recommended, since only the Line Conductor has
over-current (fuse} protection within the instrument.
The instrument has a three-wire power cord with a
three-terminal polarized plug for connection to the power
source and safety-earth. The ground (earth) terminal of
the plug is directly connected to the instrument frame. For
electric-shock protection, insert this plug only in a mating
outlet with a safety-earth contact.
@ | 475A/DM44 Operators 1

OPERATING VOLTAGE
CAUTION
ANA IS MO ol MO MM?
This instrument may be damaged if operated with
the line voltage selector switch or the regulating
range selector set for the wrong applied line voltage
or if the wrong line fuse is used.
Line Voltage Selection
This instrument operates from either a 115-volt or a
230-vott nominal line voltage source, 48 to 440 hertz. To
convert from one nominal line voltage range to the other,
move the Line Voltage Selector switch (located on side
panel) to indicate the correct nominal voltage. A 115-to-
230 volt adapter may be required for the line-cord plug. Be
sure to use the correct line fuse for the line voltage
selected (see Table 1).
Regulating Range Selection
Tne Regulating Range Selector assembly (located on
the rear panel} is set for one of the line voltage ranges
shown in Table 1. It also contains the line fuse for overload
protection.
To change the regulating range:
1. Disconnect the instrument from the power source.
2. Loosen the two captive screws that hold the cover
on the selector assembly; then puil to remove the cover.
3, Pull out the range selector switch bar (see Fig. 1).
Select a range from Table 1 which is centered about the
average line voltage. Slide the bar to the desired position
and plug it in. Push the cover on and tighten the screws.
TABLE 1
Regulating Ranges
Regulating Range Ni
115-Volis 230-Volts
Nominal Nominal
Range Selector
Switch Position
lower holes)
CM (Switch bar in
middle holes)
Hi (Switch bar in
upper holes)
Fuse Size
_99 to 121 volts | 198 to 242 volts
104 to 126 volts 207 to 253 volts
216 to 264 volts
0.75 A 3AG
108 to 132 volts
1,5 A JAG
2
475A/DM44
Operators
@