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44

3. Sequence Testing

Fig. 3.11 A Typical Printout from the LA102

Table of Contents

Default Chapter2
- Table of Contents2
1 Introduction9
- Viewing Angle9
- Switching-On9
- The Keyboard10
- Reset10
- Memory Clear and Non-Volatile Memory11
- The Configuration Menu12
- Connectors12
- Technical Support14
2 Manual Operation15
- Volume Control15
- Generating Tones15
- Measuring Tones16
- Channel Switching18
- Programmable Presets and Initial Settings18
- Relative Levels − Test Level (TL)18
- Measurement Options19
- Measurement Options20
- Frequency Measurement21
- Phase Measurement21
- Noise Measurement22
- Rumble Measurement23
- Crosstalk Measurement23
- Distortion Measurement24
- Wow and Flutter Measurement25
- Speed Measurement26
- Difference Frequency Distortion Measurement27
- Quantising Distortion (QD) Measurement29
- Frequency Intermodulation (FIM) Measurement29
- Standards30
- 400Hz High Pass Filter30
- Impedance & Impedance Correction (ZC)30
- Dbu, Dbv, Volts and Power Measurement31
- Impedance Correction Modes31
- Printing the Displayed Values33
- Output Waveform33
- Miscellaneous Features34
- LA101 Weighting Curves35
- User Weighting Curves35
3 Sequence Testing37
- Default Sequences38
- Test Segments40
- Running a Sequence41
- Page Results Mode42
- Frequency Response Results43
- Printing Sequence Results43
- Storing Results in Memory45
- Cyclic Identification Character46
- Test Level46
- Input Level47
- Ch Oosing a Sequence47
- Interpreting Sequence Results50
- Single Channel Operation50
- Single Register Operation52
- FSK Failure − Error Codes53
- Sweep Headroom53
- Peak Programme Meter (PPM) Testing55
- Normalisation of Frequency Response56
- Subtracting Reference Curves57
- Tests Which Always Subtract a Reference Curve57
- Oscillator Weightings57
- Automatic Results Storage59
- Printout Heading60
- Printout Date60
- Running Single Segments61
- Using Filters for Sequence Measurements62
- Remote Trigger62
- Breaking into a Repeating Sequence63
- CCITT O.33 Compatibility63
4 User Defined Sequences65
- The Sequence Definition66
- Control Segments67
- The LA101 Sequence Editor68
- Source Identification69
- Copying a Sequence71
- Measurement Levels71
- Test Level Segments (T,V)72
- Frequency Sweep Segments (Opqrsuxorux)73
- Noise Segments (L,M,N,N)73
- Crosstalk Segments (A,B,C,J,C)74
- Distortion Segments (D,E,F,G,I)74
- Wow & Flutter Segment (W)75
- Phase Segments (Y, Z, Z)75
- User Level Segment (K)75
- Maximum Output Level (MOL) Segments (H, H)76
- Difference Frequency Distortion (D)77
- Tone Burst/Tones Segment (!)78
- Repeating Segments and Sequences (<)81
- Multiple Results Compartments81
- Selecting a Tolerance (±)83
- Output Impedance Segment (%)83
- Sequence Level Segment (/)84
- Channel Segment (:)84
- Subroutine Segment (>)85
- Pause Segment (?)85
- Sweep Headroom (^N)85
- Subtract a Reference Curve (\N)86
- Equivalent ! Segments86
- CCITT O.33 Sequences87
- Apply Weighting (=N)88
5 Tolerance Testing89
- Pre-Defined Tolerances in the LA10290
- Applying a Tolerance92
- Pre-Defined Tolerances92
- Tolerance Strings93
- The Tolerance Definition93
- Printout Format95
- The LA102 Tolerance Editor96
- Editing Tolerances on a Remote Computer98
- Example Tolerance98
6 Using Test Tapes and Discs101
- Test Tape Mode101
- Frequency Sweep Mode103
- Frequency Response Results104
- Automatic W&F Measurement on Test Tapes104
7 Applications Advice107
- Tape Machines107
- Loudspeakers108
- Microphones & Low Level Inputs108
- Lines, Links & Networks109
- Mixing Consoles110
- Filters and Equalisers110
- Compact Disc Players111
- Amplifiers111
- Production Testing111
- Meter Testing111
- FM Transmitter Systems112
8 Using Printers113
- Setting up the Printer113
- Printing114
- Printout Format115
- Printers and the Configuration Menu115
- Choosing a Printer117
- Pin Dot Matrix Printers117
- Epson LQ and Other 24 Pin Printers118
- Inkjet Printers118
- Portable Printers119
- Printer Problems119
9 Remote Control121
- Connecting the LA100 to a Computer122
- The RS232 Serial Data Format123
- Entering Remote Mode123
- Command Format125
- Some Examples126
- Hints on Writing Programs127
- Remote Command Summary128
- Errors130
- General Purpose Commands131
- LA101 Output Commands133
- LA101 Preset Commands135
- LA101 Frequency Sweeps & Tone Burst Commands136
- LA101 Weighting Curves137
- LA102 Measurement Commands137
- Running a Sequence141
- Defining a Sequence143
- Reading Sequence Results144
- LA102 Heading and Date150
- Tolerance Testing150
- Memory Operations151
- Using the Smart Sequence Modes152
- User Sweeps153
- Using Sequences155
10 Service Information157
- EPROM Replacement157
- Recalibration158
- Power Supply Voltage159
- System Overview159
- Fault Diagnosis160
- Selftest Failed161
- Power Supply Check161
- Power Supply Check162
- Battery Testing162
- No LA101 Output164
- Level Errors164
- Reed Relay Faults165
- Microprocessor Faults166
- Display Faults167
- Replacing Boards167
- Spares167
- LA101 Loudspeaker168
Appendix A Accessories169
- Items Supplied with the LA100169
- Computer Support Software169
- Conversion Kits (Rack Mount/Separate)169
Appendix B Audio Sockets171
- Rear XLR Connectors171
- Front Jack Sockets172
- BNC Sockets172
Appendix C RS232 Connections173
Appendix D Circuit Diagrams175
Appendix E Error Messages179
Appendix F Frequency Lists183
- IEC Third Octave Frequencies (and Remote Codes)183
- LA101 Frequencies and Remote Codes183
Appendix G LA102 Filter Graphs186
Appendix H FSK Header Format188
Appendix I LA100 Versions188
- LA100 History189
- Upgrading Early Units189
- Software Changes189
- Rack Mounted Unit (LA100R)193
- CCITT O.41 Filter Version (LA100C)193
- Power Supply Monitoring (LA100P)194
- Telecom Australia Version (LA100T)194
- LA101 Audio Oscillator194
Appendix J Specification195
- LA102 Audio Measuring Set196
- Common to both Units198
Index199