This Master Oscillator is designed to provide all of the signals required for an advanced system. Starting from a low noise, vibration insensitive Crystal oscillator, all of the subsequent signal outputs are derived. The unit is designed to offer very low spurious signal output and excellent signal stability over the operating conditions. An advanced Built-in test function provides indication, through the VME bus, of the signal output presence for each output. Also provided is the ability to disable each output from the command bus. The device is fully tested and guaranteed over the operating conditions.