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Chadwick-Helmuth
Measuring Instruments
8500C
Chadwick-Helmuth 8500C User Manual
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7-12
Ch
adwi
ck-
Helm
uth
Com
pany
, I
nc.
Chapter 7
- S
pec
tru
m Analy
sis
89
91
Table of Contents
Default Chapter
3
Table of Contents
3
List of Figures
9
List of Tables
13
Chapter 1. Introduction
15
About this Manual
15
Organization
15
Document Conventions
16
Formats
16
Inserts, Changes, and Revisions
17
Reference Documentation
17
Table 1-1. Reference Documentation
17
Technical Support
18
Fax Service
18
Internet Service
18
Chapter 2. Overview and Basic Theory
19
About the Mo Del8500C
19
Theory of Operation
20
Characteristics of Balancing
20
Figure 2-1. Ideal Rotor with Weight and Supporting Springs
20
Figure 2-2. Shaft Wobble Induced by Mass Imbalance
20
Figure 2-3. Displacement in an Imbalanced Rotor
22
Figure 2-4. Displacement, Velocity, and Acceleration in an Imbalanced Hub
23
Figure 2-5. Strobex Strobe Tracker
24
Blade Sweep
25
Track Imbalances
25
Balance Charts
25
Paper Balance Charts
26
Figure 2-6. Sample Paper Balance Chart
26
Theory of Chart Creation and Correction
27
System Architecture
28
Digital Subsystem
28
Analog Subsystem
30
Chapter 3. Unpacking and Installation
31
Mode L 8 500C/C+ and Installation
31
Signal Selector and Installation
32
Figure 3-1. Model8500C/C+ Balancer/Analyzer
32
Figure 3-2. Model 8520C Signal Selector
33
Chapter 4. Getting Started
36
Figure 4-1. Model 8500C/C+ Balancer/Analyzer
36
Display
37
Keypad
37
Table 4-1. Mode L 8 500C/C+ Function Keys
37
Arrow Keys and Cursor
38
Auto-Repeat
38
Soft Keys
39
HELP Key
40
Figure 4-2. Model 8500C/C+ with Display and Soft Keys
40
SHOW/HIDE Key
41
MORE KEYS Key
41
SETUP Key
41
Figure 4-3. Sample Setup Screen
41
STATUS Key
42
BALANCE Key
42
SPECTRUM Key
42
TRACK Key
42
START Key
42
STOP Key
42
PRINT Key
43
ANNOTATE Key
43
LOAD Key
43
STORE Key
43
Numeric Keys
43
On-Line Help
43
Figure 4-4. Help Screen
43
Exiting the On-Line Help
44
Help Menu
44
Scrolling Help Topics and Text
44
Printer and Disk Drive
44
Printer
44
Disk Drive
44
Figure 4-5. Help Menu Scree
44
Booting up the 8500C/C
46
Starting the 8500C/C
46
Figure 4-6. Power-Up Message Screen
46
Figure 4-7. Start-Up Message Screen
46
Restarting the 8500C/C
47
Chapter 5. Balance Measurement and Solutions
49
Getting Balance Solutions: Introduction
49
Balance Charts
50
Measurements Only Chart
50
Smart Charts
50
Figure 5-1. Balance Start-Up Screen
50
Working with Balance Charts
51
Scanning Charts on Disks
51
Figure 5-2. Balance Chart Menu
51
Loading Charts from Disk
52
Renaming Charts
52
Figure 5-3. Balance Chart Disk Scan
52
Storing Charts to Disk
53
Clearing Chart Memory
53
Figure 5-4. Balance Chart Edit Screen
53
Displaying Chart Information
54
Figure 5-5. Chart Information Screen
54
Parameter Setup
55
Balance Frequency
55
Figure 5-6. Balance Setup Screen
55
Frequency Units
56
Balance Multiplier
56
Balance Type
56
Auto/Manual Stop
56
Angle Units
56
Vibration Units
57
Signal Selector Pickup Input Channel
57
Signal Selector Velocimeter Channels
57
Balance Measurement
57
Initiating Strobex Measurement
57
Figure 5-7. Strobex Activation Screen
58
Figure 5-8. Strobex: no Balance Frequency Signal Error Screen
58
Magnetic Pickup/Photocell Measurement
59
Figure 5-9. Magnetic Pickup/Photocell: no Synchronization Signal Error
59
Figure 5-10. Magnetic Pickup/Photocell Phase Meter Display
59
Solution Presentation
60
Figure 5-11. Solution Screen for Balance
60
Alternate Solutions
61
Exiting the Solution Screen
61
Figure 5-12. Balance Run Start-Up Screen
61
Initiating a Test Move (Chart Correction)
61
Additional Features
62
Balance Histories
62
Initiating a Balance History
62
Displaying Histories
63
Figure 5-13. Balance Run Start-Up Screen, Additional Soft Keys
63
Storing Histories to Disk
64
Figure 5-14. Balance History Measurements Screen
64
Figure 5-15. Balance History Move Line Screen
64
Clearing Histories
65
Chart Corrections
65
Performing Chart Corrections
66
Storing Corrected Charts to Disk
66
Figure 5-16. Correction Solution Screen
66
Clearing Chart Corrections
67
Using Measurements Only
67
Balance Solutions
67
Figure 5-17. Balance Chart Correction Screen
67
Paper Chart Creation
68
Paper Chart Correction
68
Figure 5-18. Measurements Only/Strobex Balance Start-Up Screen
68
Balancing Fixed-Wing Aircraft
69
Figure 5-19. HSGI Start-Up Screen
69
Figure 5-20. HSGI First Run Measurements
69
Figure 5-21. HSGI Move Line Calculation
70
Chapter 6. Blade Track Observation
71
Blade Track: Introduction
71
Figure 6-1. Track Startup Screen
71
Vertical Balancing
72
Visual Track Parameter Setup
72
Number of Blades
73
Track Typ
73
Figure 6-2. Track Setup Screen
73
Performing a Visual Trac
74
Initiating a Visual Track
74
Figure 6-3. Sample Rotor with Four Blades
74
Figure 6-4. Visual Track Screen
75
Figure 6-5. Visual Track, Normal Mode
75
The (NO)SPREAD Soft Key
76
Normal and Surround Mode Observations
76
Figure 6-6. Visual Track, Surround Mode
76
Blade Sweep
77
Tail Rotor Tracking
77
Chapter 7. Spectrum Analysis
79
Spectrum Analysis: Introduction
79
Data Acquisition and Storage
80
Spectral Frequency Plots
80
Aborting Data Acquisition
80
Figure 7-1. Spectral Frequency Plot
80
Figure 7-2. Spectrum Start-Up Screen
80
Storing Spectral Data
81
Spectrum Setup Operations
81
Figure 7-3. Spectrum Setup Screen
81
Using the Spectrum Setup Screen
82
Maximum Frequency
82
Frequency Units
82
Seek Amplitude
82
Vibration Units
82
Repetition Mode
82
Seek Peak Function
82
Signal Selector Velocimeter Channel(S)
83
Using Spectrum Setups
83
Saving Setups
83
Recalling Setups
84
Renaming Setups
84
Figure 7-4. Spectrum Setup Selection Menu
84
Figure 7-5. Spectrum Setup Selection Menu
84
Deleting Setups
85
Loading Setups from Disk
85
Storing Setups to Disk
85
Data Analysis
85
Figure 7-6. Setup Edit Screen
85
Figure 7-7. Spectral Frequency Plot Soft Keys
86
Figure 7-8. List of Spectral Peaks Sorted by Amplitude
86
List Peaks Function
86
SEEK ON/SEEK off Soft Key
86
Select Setup Function
86
Figure 7-10. Spectral Plot with Scaling Mode Soft Keys
87
Figure 7-9. List of Spectral Peaks Sorted by Frequency
87
Scaling Spectral Plots
87
Setting the Balance Frequency
87
SINGLE/MULTIPLE Soft Key
87
Figure 7-11. Spectral Plot with Scaling Bounds
88
Figure 7-12. Scaled Spectral Frequency Plot
88
Figure 7-13. Spectral Frequency Plot with Harmonics Cursors
89
Harmonics Mode
89
Chapter 8. Using Printouts
91
Printouts with the 8500C/C
91
Reading 8500C/C+ Printouts
92
Figure 8-1. Solution Printout (Part1)
92
Figure 8-2. Solution Printout (Part2)
93
Annotating Printouts
95
Printout Annotation Screen
95
Figure 8-3. Sample Printout with Annotation
95
Figure 8-4. Printout Annotation Screen
95
Alpha and Numeric Editing Modes
96
Figure 8-5. Additional Printout Annotation Screen Soft Keys
96
Table 8-1. Special Character Keys
96
Moving the Curso
97
Modifying Annotations
97
Saving Annotations
97
Restoring Annotations
97
Clearing Annotations
97
Editing Annotation Templates
98
Renaming Balance Charts
98
Figure 8-6. Annotation Template Screen
98
Figure 8-7. Balance Chart Edit Screen
98
Chapter 9. Status Screen Operation
101
Status Screen: Introduction
101
Figure 9-1. Status Screen
101
Screen Data Fields and Functions
102
Time and Date
102
Pickup Pulse Rate
102
Firmware Version Number
102
Prints Waiting
102
Paper Status
102
Output Storage Device
102
Memory Free
102
Disk Unit Status
103
Disk Status
103
Screen Functions
103
Review Featur
103
Selecting the Data Type
104
Selecting a New Review Item
104
Storing Review Items to Disk
104
Figure 9-2. Status Review with Balance History
104
Figure 9-3. Status Review with Spectral Frequency Plot
104
Clearing Review Items
105
Analyzing the Selected Item
105
Status Parameter Setup
105
Figure 9-4. Status Setup Screen
105
Setting Pickup Pulse Rate Units
106
Setting the Output Storage Device
106
Setting the Time and Date
106
Chapter 10. Printer and Disk Drive
107
Using the Printe
107
General Operation
107
Paper Roll Replacement
107
Figure 10-1. 8500C/C+ Printer Mechanism
108
Using the Disk Drive
109
Loading Disk Files
109
Figure 10-2. Front and Rear View of a 3.5-In. Floppy Disk
109
Storing Data to Disk or Memory
110
Storing Balance Charts to Disk
111
Figure 10-3. Balance Chart Edit Screen
111
Copying Balance Charts
112
Formatting Disks
112
Figure 10-4. Format Disk Warning Screen
112
Disk Drive Care
113
Chapter 11. Model 8520C Signal Selector
115
Signal Selector: Introduction
115
Signal Selector Operation
116
Figure 11-2. Model 8520 System Block Diagram
117
Channel Selection
118
Figure 11-3. Balance Setup Screen with Model Signal Selector Support
118
Figure 11-4. Balance Setup with Two 8520 Velocimeter Channels
118
Appendix A. Specifications
119
Appendix B. Spectral Data File Format
123
Table B-1. Spectral Data File Format and Contents
123
Appendix C. Balance History Files
125
Table C-1. Balance Data File Format and Contents
125
Appendix D. Quick Reference Guide
127
4
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Chadwick-Helmuth 8500C Specifications
General
Brand
Chadwick-Helmuth
Model
8500C
Category
Measuring Instruments
Language
English
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