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TABLE
OF
CONTENTS
The
494A/494AP
service
Manuat
is
divided
into two
volumes.
VOLUME
1
Page
PREFACE
........................
i
TABLE
OF
CONTENTS
..............
..........
iii
LIST
OF ILLUSTRATTONS
...........
........
x
LIST
OF TABLES
.............
xiii
SERVICING
SAFETY
SUMMARY
.........
xv
Section
1
GENERAL
INFoRMATION
product
Description
...........
1_1
Conformance
to
Industry
Standards
............
1_1
Product
Service
.................
1_1
Instrum€nt
Construction
....
1-z
Installation
and
Preparation
for
Use
...........
,l_2
Changing
power
Input
Range
....,.....,.....
1_2
Replacing
Fuses
.........
Selected
Components
.......1-2
Assembly
and
Circuit
Numbering
..............
1_2
Firmware
Version
and
Error
Message
Readout
....
1-g
Options
..........
1-g
Accessories
..,....................
1-3
Section2
SPEC|F|CAT|ON
ELECTRICAL
................
.....2-1
Verification
of
Tolerance
Values
.....,.
Z-1
Frequency
Related
Characteristics
...
2-1
Amplitude
Related
Characteristics
....
2_6
Input
Signat
Characteristics
..............
2-1
1
Output
Signal
Characteristics
...........
2-1g
General
Characteristics
....................
2-1
s
'
Power
Requirements
........,.........,.....
2-1 5
ENV|RONMENTAL..........
...
2_16
PHYSTCAL
.....2-.t7
Section
3
INSTALLATION
o
o
o
t
o
o
o
o
o
o
o
a
I
o
I
a
a
o
I
o
o
o
o
o
o
o
o
o
t
o
a
o
I
o
o
t
o
I
a
o
o
a
o
o
UNPACKING
AND
tNtilAL
TNSPECTTON
.......,
3-1
coNNECTtNG
POWER
.....
3_2
Power
Source
and
Power
Requirements
........................
g_2
STORAGE
AND
REPACKAGING
......,....
3.2
Storage
.....
g_2
Repackaging
for
Shipment
................
g-3
494A/494AP
Service
Vot.
1
Page
Section
4 PERFORMANCE
CHECK
Introduction
..,.4-1
Incoming
Inspection
Test
......................
4_1
Option Instrument
Checks
..............,......
4_1
Verification
of Tolerance
Values
............
4_1
History Information
............
4-1
Equipment
Required
..........
4-1
PRELIMINARY
PREPARATTON
.............
4-4
Initial Power-Up
............
.....44
Calibrate
Position,
Center
Frequency,
Reference
Level,
and Dynamic
Range
..........
4-s
PERFORMANCE
CHECK
pRocEDURE
................
.....
4_6
1.
Check't0
MHz Reference
Oscillator
Accuracy
...........
4_6
2.
Check
Counter Accuracy
..................
4-6
3. Check
Counter Sensitivity
................
4-6
4.
Check
CentEr Frequency
Accuracy
.,......4-T
5. Check
Center
Frequency
Stability
...........
4-9
6. Check
Residual
FM
..........................
4-9
7.
Check
Frequency
Span/Div
Accuracy
............
4-10
8. Check
MarkerAccuracy
...................
4-12
9. Check
Sweep
Time
Accuracy
........4-19
10.
Check
Pulse
Stretcher
....................
4-19
11.
Check
Resolution Bandwidth
and
Shape Factor
..........-...4-14
12.
Check
Calibrator
Output
.................. 4-15
13.
Check
Noise
Sidebands
..................
4-15
14.
Check
Frequency Response
............
4-16
15.
Check
Disptay Dynamic
Range and
Accuracy .............................
4-1
g
16.
Check Preselector
Ultimate Rejection
.........-...4-20
17.
Check
RF Attenuator
Accuracy
....... 4-20
18.
Check lF
Gain
Accuracy
..................
4-25
'l
9. Gheck
Gain
Variation
Between
Resolution
Bandwidths
......4-26
20.
Check
Sensitivity
......... 4-26
21. Check
Residual
Spurious Response
...........4-27
22. Cheek
lntermodulation
Distortion
........4-2A
23.
Check
Harmonic Distortion
........,..... 4-29
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