This blog post describes how to use the MFLI Lock-in Amplifier with an external reference frequency. The reference frequency comes from a signal generator Model 6221 from Keithley which is used to apply higher voltage pulses or sinusoidal signals on the sample. In some situations the MFLI can be used...
This blog post describes how a setup can be protected from overvoltage that occurs when switching off a coil. Fast changing currents induce transient voltages in an inductive load which can be expressed by the formula: V = - L (dI/dt) L is the inductance in Henry and dI/dt is...
This blog post shows how to output sinusoidal signals on the AUX Output of the MFLI Lock-in Amplifier with the MF-MD Multi-Demodulator option. Keep in mind that AUX outputs are not designed to output sinusoidal signals as the Signal Output.
This blog post describes a method to detect material defects. Eddy current measurements are used for non-destructive material testing (NDT). An alternating magnetic field is penetrating a sample. The material defect is detected by a phase shift. Experimental Setup
