The WILTRON Model 610C Sweep Generator is a precision, compact instrument used to provide high-accuracy. swept-frequency measurements from 100kHz to 18.5GHz. This solid-state unit features a very flat output, built-in leveling, low harmonics, and a versatile frequency marker system. An extensive series of RF Plug-Ins makes possible this wide frequency coverage. A variety of factory installed options extends the versatility of this instrument to suit the individual needs of the customer. As shipped, the Model 610C Sweep Generator is housed in its own sturdy cabinet for bench top use. A tilt stand is provided to raise the front panel for better Slide Rule Dial viewing. Rack mounting ears are available at no extra charge upon request. With these installed and the rubber feet removed, the unit will then occupy 7 inches in a standard 19-inch rack console. The Main Frame of the Model 610C is used to generate an accurate, stable, voltage ramp which drives the oscillator control circuits in the RF Plug-In being used. Power supplies and leveling control circuitry are also housed in this unit. Refer to Section III for a functional description of each circuit and how they relate to one another. A versatile system of variable frequency markers is incorporated into this instrument. With the RF PIP marker selected, the RF output from the RF Plug-In will be reduced momentarily to provide the marker. When set to VIDEO, a negative video pulse at the preset marker frequency is generated. With the INTENSITY marker selected, the sweep is delayed momentarily causing an intensification of the oscilloscope trace. The frequency at which the selected marker appears is determined by the VAR FREQ MKR control setting.