TNP #41 - Stanford Research SR620 Universal Time Interval Counter Teardown, Repair & Experiments

In this episode Shahriar repairs an SRS SR620 frequency interval counter where the magic smoke has escaped! The instrument does not power on and the teardown reveals a burnt resistor. The circuit examination shows a voltage regular for the 5V output which has a short circuit the the chassis. A simple repair and resistor replacement brings the unit back to life. The performance of the internal OCXO is measured against a Rubidium oscillator and the unit is frequency calibrated. The XY output mode of the unit as well as its ability to measure propagation delays are also shown. Please consider supporting The Signal Path: Other links: