Tektronix 1401 User manual

INSTRUCTION
MANUAL
1401
Serial
Number
02018
SPECTRUM
ANALYZER
MODULE
Tektronix , Inc. ● P. O. Box 500 Beaverton , Oregon 97005 Phone [phone]
Phone [phone] Cables : Tektronix
070-1071-00
1070

arou
WARRANTY
All
Tektronix
instruments are
warranted
against
defective
materials and
workmanship
for
one year .
Tektronix
transformers
,
manufactured in our
plant
,
are
warranted for the
life of the
instrument .
Any
questions
with
respect to the
warranty ,
mentioned
above
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 procedure will assure
you the fastest possible service . Please include the
instrument Type ( or Part Number ) and Serial or
Model
Number
with all
requests
for
parts or
service .
Specifications and price
change
privileges reserved .
Copyright
©
1970 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 the
copyright
owner
.
U.S.A. and foreign Tektronix products covered
by U.S. and
foreign
patents
and /
or
patents
pending
.
43

TABLE
OF
CONTENTS
SECTION 1
SPECIFICATIONS
Introduction
Electrical Characteristics
Power
Requirements
SECTION 2
SECTION
3
Environmental Characteristics
Physical
Characteristics
OPERATING
INSTRUCTIONS
Accessories
for the 1401
Installation
Power Source and Application
Battery
Care
Function of Controls and Connectors
First Time Operation
General
Operating Information
Signal
Application
Resolution and Frequency Span
Using
the
Video
Filter
Selecting
Sweep
Rates
Triggering
the
Sweep
Externally
or
Using an
External
Sweep
Source
Sweeping the
Companion
Oscilloscope
422/1401
Compatibility
453/1401 and 454/1401 Compatibility
Alternate Procedure for Most Oscilloscopes
CIRCUIT DESCRIPTION
Introduction and Block Diagram Description
Detailed Circuit Description
RF
Section
IF Circuit
Logarithmic
Amplifier
,
Linear
Amplifier
and Video
Circuits
Sweep
Generator
Frequency
Span and
Center
Frequency
Marker
Generator
Sweep
Shaper
Power
Pack
Page
1-1
1-1
1-2
1-2
1-3
2-1
2-1
2-1
2-3
2-5
2-8
2-10
2-10
2-10
2-11
2-11
2-11
2-12
2-13
2-13
2-13
3-1
3-3
3-3
3-4
3-5
3-5
3-5
3-7
3-8
3-9
3-12
1401
i

1401
ii
SECTION 4
SECTION 5
SECTION
6
TABLE OF CONTENTS ( cont )
MAINTENANCE
Access
to the
Interior
Preventive
Maintenance
Procedure
Troubleshooting
Corrective
Maintenance
Procedures
Obtaining
Parts
Soldering
Power
Pack Servicing
Replacing
Circuits
Boards
or
Assemblies
Replacing
Square Pins
for
Multi - pin
Connectors
Cam Switch Repair or Replacement
RF Module and Sub - assemblies
Physical Location of Components
PERFORMANCE
CHECK
Introduction , History Information , and Equipment Require
ments for
the
Performance
Check
Short Form Procedure
General Information
Procedure
Preliminary
Battery Charge Level Indicator Operation
Center Frequency Range and Accuracy
Frequency
Span
Resolution
Bandwidth
Incidental FM
Video
Filter Operation
Dynamic Range
of Display
Functions
RF Attenuator dB Selector Check
Video Output Level
Sensitivity
Display
Flatness
Spurious Response
Intermodulation Distortion
Sweep Rate Range and Sweep Output Amplitude
External
Trigger
Operation
External
Sweep
Voltage
In
Operation
CALIBRATION ADJUSTMENT PROCEDURE
Introduction ,
History
Information
and
Equipment
Required
Short Form Procedure
Preliminary Procedure
Set Battery Charge Current
Check
/
Adjust Power
Regulation
Voltages
Detailed Alignment Procedure of RF and IF Circuits
General Alignment of RF and IF Sections
Frequency Span and Center Frequency Accuracy Adjustments
Adjustment
of Linearity
Gain
Page
4-1
4-1
4-2
4-7
4-7
4-7
4-7
4-9
4-10
4-11
4-11
4-11
5-1
5-1
5-3
5-4
5-4
5-5
5-6
5-7
5-7
5-8
5-8
5-9
5-9
5-9
5-10
5-10
5-10
5-10
5-11
5-12
6-1
6-1
6-1
6-2
6-3
6-3
6-6
6-7
6-11

SECTION
7
TABLE
OF
CONTENTS (
cont
)
SECTION
9
ELECTRICAL
PARTS
LIST
Abbreviations
and
Symbols
Parts
Ordering
Information
Index of
Electrical
Parts
List
Electrical
Parts
List
SECTION 8
DIAGRAMS ,
CIRCUIT
BOARDS ,
MECHANICAL
AND
REPACKAGING
PARTS
ILLUSTRATIONS
Symbols
and
Reference
Designators
1401
Waveform
and
Voltage
Information
MECHANICAL
PARTS
LIST
Mechanical
Parts
List
Information
Index of
Mechanical
Parts
Mechanical
Parts List
Accessories
Abbreviations and
symbols used in
this
manual are
based on or
taken directly from
IEEE
Standard 260 "
Standard
Symbols for
Units
" , MIL -
STD - 12B
and
other standards of
the
electronics
industry
.
Change
information , if any , is
located at the rear
of this
manual
.
1401
iii

1401
Com
10
OFF
POWER
20
BATTERY
CHARGE
LEVEL
OF
GAIR
RF
ATTEN
dB
30
40
ON
50
60
VERTICAL
DISPLAY
LOG
LIN
1.500
250
INPUT
500
-30
dBm
MAX
1401
SPECTRUM
ANALYZER
MODULE
1401
TEKTRONIX
SPECTRUM
ANALYZER
MODULE
CENTER
FREQ
MHz
SEARCH
MARKER
FINE
012
/
VIDEO
FILTER
FREE
RUN
OFF
TRIG
IN
RESOLUTION
kHz
EXT
IN
MODE
SWEEP
Fig
. 1-1
. 1401
Spectrum
Analyzer
Module .
1000
100
TEKTRONIX ,
INC .
BEAVERTON
,
OREGON ,
U.S.A.
SLOW
RATE
FREQ
SPAN
MHz /
DIV
VAR
(
CAL IN
)
FAST
0.01.02.05
SEARCH
1
12

SECTION 1
SPECIFICATION
Change information , if any , affecting this section will be found at the rear of the manual .
Introduction
The 1401
Spectrum Analyzer
Module
is
a
compact port
able instrument designed to operate with a Tektronix Type
323 portable oscilloscope so that the two instruments com
prise a portable spectrum analyzer system that can be used
for on - site spectrum surveillance , RFI testing , etc.
The 1401 has a swept front - end which provides a fre
quency span from 1 MHz to 500 MHz . A linear or logarith
mic display is provided . Dynamic range of the logarithmic
display
is at
least 60
dB .
The 1401
will
operate from any one
of three
power
sources ;
internal rechargeable
batteries ,
external ( +6 V
to
16 V ) DC , and AC line . Power consumption is about 4.5
watts DC , and up to 14 watts when powered from an AC
source .
WARNING
When the 1401 is used as a portable instrument , a
common
ground
return to the
signal
source
must be
provided . This insures that measurements are reliable ,
and eliminates any possibility of the instrument case
becoming
elevated to the
potential of the
signal
source
.
The instrument power pack is provided with a three
terminal polarized power receptacle and a three wire line
cord for applying AC to the power pack . The third wire is
directly
connected to the power
pack chassis ,
which is con
nected by
interconnecting
wires to the
1401
chassis . This
grounds the instrument when operating from an AC source
to
protect
operating personnel as
recommended by
national
and international safety codes .
Performance Conditions
The
performance
limits in
this
section are valid with
the
following
conditions
:
Power the instrument from the battery or an external
DC
source
. The
instrument
must have
been
calibrated with
in
an
ambient
temperature
of 20
° C to 30
° C (
Section 5
provides a
description of the
procedure for
checking the
1401 ) . The
instrument must be
operated within an
ambient
temperature of -15 ° C to + 55 ° C , and must be allowed to
warm up for at least 20 minutes after switching the POWER
to ON
position .
ELECTRICAL CHARACTERISTICS
Characteristic
Center
Frequency
Accuracy
FINE Control
Range
Sensitivity
Resolution
Band
width
3
kHz
100 kHz
1000
kHz
Frequency
Span
Calibrated MHz /
Div
Range
with
10
division
display
Accuracy
Linearity
Frequency
Stability
Performance Requirement
1 MHz to 500 MHz , continuously
variable .
+
or
Within
( 5 MHz
+ 5 % of the 1-500
dial
readout ) ,
FINE control at
.
-
1
MHz ,
within
10 %
At
least 100
dBm
-
1401
At
least -90
dBm
At
least -80 dBm
Hz to 500
MHz
10 kHz / Div to 50 MHz / Div in 1 , 2 ,
5
sequence .
Within
10 % of
FREQ
SPAN
MHz
/ Div
selection , with
VARiable
control in CAL position .
Within 10
% with 10
division
dis
play
.
Within 50
kHz , at
+ 20 ° C to
+ 30 ° C
,
over
any 5 minute
interval ,
after
20
minute warmup . Temperature co
efficient less
than 0.5
MHz / ° C
.
1-1

Specification -
1401
ELECTRICAL CHARACTERISTICS ( cont )
Characteristic
Intermodulation
Distortion
Maximum
Input
Power
RF
ATTEN
at
dB
RF
ATTEN at
60 dB
Display
Flatness
Resolution Band
width
Incidental
FM
IF GAIN Control
Range
Dynamic
Range
LOG
Display
VIDEO OUTPUT
External
Trigger
Level
Duration
Frequency
External
Sweep
Level
Performance
Requirement
1-2
Down at least 50 dB .
-30 dBm ( Linear operating limit )
+30 dBm ( Power rating of atten
uator )
Within 3 dB maximum amplitude
variation over the entire frequency
range
.
1000
kHz , 100
kHz , 3 kHz
, within
10 % .
Sweep
Range (
FREE 1
sweep / s
or less to
at least
100
RUN
Mode ) sweeps /
second .
No
more
than 20
kHz at 1
MHz
center
frequency
, to
10
kHz or
less
at 500 MHz
center
frequency .
30
dB
or more
At
least 60 dB
1.2 V for full screen deflection .
+1 V
to
+10 V
peak
At least 100
ns
1
MHz
or
less
to 5 V
with V
corresponding to
Hz frequency and +5 V corres
ponding to 500
MHz .
Maximum
Sweep
100
sweeps
/ second
Rate
Maximum
Input
10
V
Voltage
ELECTRICAL
CHARACTERISTICS
( cont )
Characteristic
RF ATTENuator
Accuracy
Sweep Output
(
FREE RUN
or
EXT TRIG
Mode )
Characteristic
Line
Voltage
Range
Frequency
POWER SOURCE REQUIREMENTS
Power
Consumption
External DC Volt
age
Range
Power
Consump
tion
Battery
Pack
Charge
Time
Operating
Time
( + 20 ° C to + 25 °
charge
temperature
,
+ 20 ° C to + 30 ° C
operating
tem
perature ) .
Characteristic
Performance Requirement
Temperature
to 60
dB in
10 dB
steps
Within (
0.5 dB + 1
% of dB read
ing )
Without
Batteries
5 V ± 0.25 V
Performance
Requirement
90 V to 136 V AC
or
180 V to 272 V AC
48 Hz to 440 Hz
14 watts maximum at 115 V AC
+6 V to
+16 V. Surge
current
requirement is 1
ampere .
4.5 watts maximum
Six
, C size
NiCd
cells
ENVIRONMENTAL
CHARACTERISTICS
16
hours
for
full
charge
At
least
3.5
hours
Performance
Requirement
Non - operating
With Batteries
-40
° C to + 60
° C
-
55 ° C to + 75
° C

ENVIRONMENTAL CHARACTERISTICS ( cont )
Characteristic
Operating
Charging
Altitude
Non -
operating
Operating
Vibration
Operating
Height
Width w / handle
Depth w / panel cover
Depth
w /
handle
Performance
Requirement
-15 ° C to + 55 ° C
° C to + 40 ° C
To 50,000 feet
To 30,000 feet ; maximum ambient
temperature
rating
must be
de
creased 1 ° C per 1000 feet , from
15,000
to 30,000
feet .
15 minutes along each of the 3
major axes , 0.025 inch peak
to - peak displacement ( 4 g's at 55
c / s ) 10 to 55 to 10 c / s in 1 - minute
cycles .
Net
approximate
weight
w /
o
accessories
Domestic shipping weight
Export - packed weight
in .
3-1 /
2
8-1
/ 2
10-5 / 8
13
1401
lb.
≈7 1/2
13
21
Humidity
cm
.
ENVIRONMENTAL CHARACTERISTICS ( cont )
Characteristic
Non -
operating
and
Operating
Electromagnetic
Finish
8.9
21.6
27.0
33.0
kg .
≈3.4
5.9
9.5
in .
3-1 / 2
8-1
/ 2
10-5 /
8
13
lb.
≈7
13
≈21
323
Performance
Requirement
5
cycles ( 120
hours ) to 95 %
relative
humidity
reference
to
MIL
- E
16400F ( Par . 4.5.9 through
4.5.9.5.1 , Class 4 ) .
Meets
radiated interference
require
ments
of MIL
-
1-6181D
and
MIL
-
1-1690C over the range
150
kHz
to one
GHz . (
Instrument
must
be
battery operated . )
PHYSICAL
Specification
-
1401
Front -
panel has an
anodized
finish
;
cabinet
is
made of
vinyl - clad
aluminum .
cm .
8.9
21.6
27.0
33.0
kg .
3.2
5.9
9.5
in .
1401/323
7
9-3 / 8
10-5 / 8
14-5 / 8
lb.
≈14 1/2
~ 22
≈30
cm .
17.8
23.8
27.0
37.2
kg .
≈6.6
≈10.0
13.6
1-3

NOTES
1
1
1