MISC RLC Measurements

The MISC RLC Automated Test can be used, in conjunction with current and voltage monitoring, to measure the impedance of loads and plot the impedance and reactance across the audio spectrum. For the measurement to work, the left channel must be measuring the voltage across the DUT, and the right channel must be measuring the current into the DUT. Both of these measurements occur while during an expo chirp.

For the rest of this discussion, we'll use the QA462, which provide both current and voltage monitoring. The QA462 can drive up to 1.5A of current, and it has a selectable one-of-three push button to allow you to pick 1, 10 or 100 output current sense resistors.