User and Programming Manual – Rev P California Instruments5.6. Oscillator Control BoardThe Oscillator control board has the Microcontroller and all the control logic to generate aprogrammable sine wave reference of the correct amplitude and frequency. It includes allthe control logic to respond to user commands from the front panel or the remote controlinterface. It also updates the displays to show the programmed settings and currentmeasurements. Refer to Figure 5-2 for a block diagram.When the output is programmed above 5.0 volts, the multicolor LEDs, DS10 and DS9, onthe oscillator board will illuminate.. Current Current DACCurr. Sense/FaultSense FrequencyGenerationMicro Voltage DACFront ControllerPanelControlDisplay Sine WaveGeneration OSCReferenceDC NVRAMSupply RS232/IEEEOptionFigure 5-2: Oscillator and controlsRP Series October 2005 21