ESI QuataFire 610 User Manual

LIMP Program for Loudspeaker Impedance Measurement User Manual Version 1.7.0. Ivo Mateljan Electroacoustics Laboratory

LIMP User Manual 10 Figure 4.3 Status bar shows the peak level (ref. full scale) of left and right line inputs Generator typeAveraging typeS

LIMP User Manual 11 1) In the Edit box user optionally enters the text that will be appended at the bottom of the graph. 2) Check box 'Add fi

LIMP User Manual 12 4.1 LIMP Menus Here is a brief explanation of LIMP menus: File New - initializes a new file content Open..

LIMP User Manual 13 Audio devices - sets current input and output devices Generator - sets generator parameters Mea

LIMP User Manual 14 4.2 Soundcard Setup Activate the menu Setup->AudioDevices. You will get the 'Soundcard Setup' dialog box shown in F

LIMP User Manual 15 5) In ‘Audio device setup’ dialog click the button ‘Control panel’ to open the Windows ‘Master Volume’ dialog box, which is show

LIMP User Manual 16 Figure 4.8 Typical setup of a soundcard output mixer in Windows XP Note: Most professional audio soundcards have their own pro

LIMP User Manual 17 Figure 4.9 Vista Sound Control panel Figure 4.10 Playback channel properties – Output levels

LIMP User Manual 18 Figure 4.11 Setting the native bit resolution and sampling rate in Vista Note: There are a lot of drivers that do not work stab

LIMP User Manual 19 In Limp, the latency is not problem, as it is encountered in software, but it is not recommended to use buffer with size larger th

LIMP User Manual 2 Content 1 WHAT IS LIMP? ...

LIMP User Manual 20 Recommendation:  For most reliable results use sine generator, but don't push loudspeaker into large displacement (the l

LIMP User Manual 21 Transient time (ms) - enters transient time to allow the system to get to the steady state (before starting the integration). In

LIMP User Manual 22 Figure 4.16 Impedance measurements with averaging a) Procedure in Stepped sine mode Measurement procedures for stepped sine

LIMP User Manual 23 View All – enables the view of all DFTspectrum components that are used in impedance estimation. View Phase – enables a phase pl

LIMP User Manual 24 The second way to change graph colors is a "user mode". User sets an arbitrary color for every graph element using the &

LIMP User Manual 25 Finally, in section Calibrate we enter the Number of averages (recommended value is 1, as we measure high level signals) and pres

LIMP User Manual 26 Textual files have extension .txt or .zma. They contain lines of text with three numeric literals: frequency (in Hz), magnitude (

LIMP User Manual 27 5 Loudspeaker parameters This chapter gives some definitions and measurement procedures for the estimation of loudspeaker parame

LIMP User Manual 28 Using these analogous circuit elements, Thiele and Small [6, 7] introduced dynamical loudspeaker parameters. They are defined i

LIMP User Manual 29 5.2 Estimation of Thiele-Small parameters It is easy to estimate Thiele-Small parameters if we have measured data for the loudspe

LIMP User Manual 3 1 What is LIMP? The LIMP is a program for the measurement of the loudspeaker impedance and estimation of loudspeaker physical and

LIMP User Manual 30 121212012rrrfffQsMS Now we can define a step-by-step procedure for the measurement of Q factors: 1. Measure a voice coil r

LIMP User Manual 31 5.3.2 Closed Box Method In this method we first measure the impedance curve and estimate Thiele-Small parameters fS, QMS and QES,

LIMP User Manual 32 Figure 5.2 Dialog box for the estimation of loudspeaker Q-factors 5.4.1 Added Mass Method To estimate all physical and dynami

LIMP User Manual 33 Then we activate the menu Analyze->Loudspeaker parameters – Added mass method to get the 'Loudspeaker Parameters' di

LIMP User Manual 34 Figure 5.5 Impedance curve (the one with higher resonance frequency is obtained by mounting the loudspeaker in a closed box) T

LIMP User Manual 35 6 RLC measurement The LIMP can be used to measure value of resistors, capacitors and inductors, simply by calculating resistive,

LIMP User Manual 36 6.1 Importance of calibration When measuring impedance and capacitance it is very important to calibrate the system before the me

LIMP User Manual 37 Not all LIMP users will have this problem. As explained before, the problem exists when probe for impedance voltage V2 has highe

LIMP User Manual 4 2 Impedance measurement theory 2.1 Basic circuit for impedance measurement The measurement of the loudspeaker impedance is based o

LIMP User Manual 5 This pink multisine has Ak =√2A2k and its spectral magnitudes roll-off 3dB/oct (after some cut-off frequency). In the LIMP, a vari

LIMP User Manual 6 2.4 Measurement in a noisy environment The main source of the measurement noise is a loudspeaker that acts as a microphone for the

LIMP User Manual 7 2.4.1 Lowering measurement noise in stepped sine mode In stepped sine mode LIMP uses "heterodyned" principle to filter a

LIMP User Manual 8 3. Hardware Setup The simplest measurement configuration is shown in Fig. 3.1. The soundcard phone-out (or loudspeaker out) is u

LIMP User Manual 9 4 Working with LIMP When you start the LIMP you get the program window shown in Fig. 4.1. There are: menu bar, toolbar and a dial