AutoMeasure - software download

Pulse Response Examiner software
current version: 1.1

Requires LabVIEW Run-Time Engine 8.5 running on Windows Vista, XP, or 2000. To download, click one of the links below. Then unzip the file to an empty folder, and run 'setup.exe' to install.

pulse_resp_1_1.zip (5 MB) if you already have the LabVIEW Run-Time Engine.

pulse_resp_1_1_lvrt.zip (53 MB) includes the LabVIEW Run-Time Engine installer.

I wrote this little program as an experiment with a fast inverse Laplace transform, and it's turned out to be a handy tool. Use it to examine the pulse shape that results from a simple RLC circuit. R (resistance), L (inductance), and C (capacitance) sliders are provided for instant feedback of the Vout waveform shape. The circuit analyzed is typical of signal transmission through cables and connections into a high impedance analog input. Another application is where the signal current path is physically separated from the return current path, and the effect of loop inductance must be analyzed. The program is also useful in troubleshooting digital triggering problems, in which dominating inductance can cause spurious triggers due to ringing, and dominating capacitance can cause missed triggers due to reduced pulse height or spurious triggers due to slow rise.

If you know the return current path of a signal, you can often calculate the inductance. Try this web-based inductance calculator. If the intervening material is air or a dielectric insulator, you can use μ_r = 1.

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