LA100 Audio Analyser Manual - Lindos Electronics

1 LA100 Audio AnalyserManualSixth edition, June 2007 2007 Lindos ElectronicsPart number: MN100 This Manual describes LA100 software version Please refer to any accompanyingupdate sheets if your LA100 displays a version number later than this when it is turned onor reset. Users familiar with earlier software should refer to appendix for a list of are continuously developing and enhancing the software within the LA100 and sendmajor new software EPROMs to all users. You should therefore ensure that you completeand return the enclosed registration card directly to Lindos Electronics and advise of anychange of ownership or change of address so that you receive these comments and suggestions regarding the LA100 will be gratefully ELECTRONICST echnical Support (usually 24 hours):Saddlemakers LaneTelephone:+44 (1394) 380307 MeltonWOODBRIDGEFax.

2 +44 (1394) 385156 Suffolk IP12 Viewing The Memory Clear and Non-Volatile The Configuration Technical Manual Volume Generating Measuring Channel Programmable Presets and Initial Relative Levels Test Level (TL) Measurement Frequency Phase Noise Rumble Crosstalk Distortion Wow and Flutter Speed Difference Frequency Distortion Quantising Distortion (QD) Frequency Intermodulation (FIM) 400Hz High Pass Impedance & Impedance Correction (ZC) dBu, dBV, Volts and Power Printing the Displayed Output Miscellaneous LA101 Weighting User Weighting Sequence Running a Page Results Frequency Response Printing Sequence Storing Results in Cyclic Identification Test Input Choosing a Interpreting Sequence Single Channel Single Register FSK Failure Error Sweep Peak Programme Meter (PPM)

3 Normalisation of Frequency Subtracting Reference Tests Which Always Subtract a Reference Oscillator Automatic Results Printout Printout Running Single Using Filters for Sequence Remote Breaking into a Repeating CCITT User Defined The Sequence The LA101 Sequence Source Copying a Measurement Test Level Segments (T,V) Frequency Sweep Segments (OPQRSUX orux) Noise Segments (L,M,N,n) Crosstalk Segments (A,B,C,J,c) Distortion Segments (D,E,F,G,I) Wow & Flutter Segment (W) Phase Segments (Y, Z, z) User Level Segment (K) Maximum Output Level (MOL) Segments (H, h) Difference Frequency Distortion (d) Tone Burst/Tones Segment (!)

4 Repeating Segments and Sequences (<) Multiple Results Selecting a Tolerance ( ) Output Impedance Segment (%) Sequence Level Segment (/) Channel Segment (:) Subroutine Segment (>) Pause Segment (?) Sweep Headroom (^n) Subtract a Reference Curve (\n) Equivalent ! CCITT Apply weighting (=n) Tolerance Applying a Pre-Defined Tolerance The Tolerance Printout Printout The LA102 Tolerance Editing Tolerances on a Remote Example Using Test Tapes and Test Tape Frequency Sweep Frequency Response Automatic W&F Measurement on Test Applications Tape Microphones & Low Level Lines.

5 Links & Mixing Filters and Compact Disc Production Meter FM Transmitter Using Setting Up the Printout Printers and the Configuration Choosing a 9 Pin Dot Matrix Epson LQ and Other 24 Pin Inkjet Portable Printer Remote Connecting the LA100 to a The RS232 Serial Data Entering Remote Command Format1259. 5 Some Hints on Writing General Purpose LA101 Output LA101 Preset LA101 Frequency Sweeps & Tone Burst LA101 Weighting LA102 Measurement Running a Defining a Reading Sequence LA102 Heading and Tolerance Memory Using the Smart Sequence User Using Service EPROM Power Supply System Fault Selftest 5V Power Supply 15V Power Supply Battery No LA101 Level Reed Relay Microprocessor Display Replacing LA101

6 Loudspeaker168 Appendix A Items Supplied with the Computer Support Conversion Kits (Rack Mount/Separate)169 Appendix B Audio Rear XLR Front Jack BNC Sockets172 Appendix C RS232 Connections173 Appendix D Circuit Diagrams175 Appendix E Error Messages179 Appendix F Frequency IEC Third Octave Frequencies (and remote codes) LA101 Frequencies and Remote Codes1826 Appendix G LA102 Filter Graphs185 Appendix H FSK Header Format187 Appendix I LA100 LA100 Upgrading Early Software Rack Mounted Unit (LA100R) CCITT Filter Version (LA100C) Power Supply Monitoring (LA100P) Telecom Australia Version (LA100T)

7 193 Appendix J LA101 Audio LA102 Audio Measuring Common to Both Units197 Index 199 List of Correction of Sequence Tolerances in the Command Octave Frequencies and Remote Frequencies and Remote IntroductionThe first time user should read this chapter, which describes basic features common toboth units, but may then proceed to chapters 2 or 3 for a complete introduction to eithermanual or sequence measurement. Sequence measurement is a very easy way of makinga predefined sequence of measurements, at the press of a few keys, without anyprogramming effort, and without any connection between units other than the signal users should refer to chapter 7 for applications advice on testing specific devices andalso appendix A which lists the items supplied with the LA100 and the optionalaccessories which are available.

8 Other sections of the Manual give further information ondefining sequences, tolerance testing, using printers, remote computer control via theserial (RS232) interface and on servicing the LA100 as there is no separate servicemanual. In all cases the most important information can be found at the start of eachchapter; the sections towards the end of each chapter describe the technical details andmore specialist the LA101 Audio Oscillator and LA102 Audio Measuring Set are twoindependent units, they are generally used together, and for convenience are then referredto as the LA100 Audio Analyser .

9 The LA100R is a rack mount version of the LA100consisting of the LA101 and LA102 bolted together, side by side, to go into a 19" appendix A for conversion kit details. Conversion kits 19" rack Viewing AngleLCD contrast Lighting the display Backlit displayThe full-graphic liquid crystal display in these units combines great flexibility of displaywith very low power consumption. Units with serial numbers below 3430 use non-backlitdisplays, and for good contrast it is essential that light strikes the display from above thenormal and is reflected off towards the eye below the normal.

10 This requires a large angleof tilt, or high mounting on a shelf or in a rack. Later units are fitted with high contrastbacklit displays, and the viewing angle is less critical. Earlier units can be upgraded tothe backlit display. A contrast adjustment is fitted inside the top cover (section )which gives some optimisation for different viewing angles, but the units are supplied setfor best overall Switching-OnSwitching on Mains voltage Power supply Mains power supply Power supply voltageThe units can be powered either from the mains or from their internal rechargeablebatteries.