The PM5139 function generator introduces a new concept of menu-driven operation to waveform generation and frequency synthesis. Microprocessor control enables simple and rapid operation and allows you to set parameters by stepping through the menu offered. One single control rotary knob allows you to make precise settings of all numeric values. The large backlit LCD clearly displays the selected signal and gives a readout of vital parameters, such as frequency, waveform, amplitude, and modulation. Any invalid parameter selections are ignored and an error message shows the incorrect settings that have been made. The PM5139 frequency range covers IT/2 decades, from 0.1 mHz to 20 MHz. Ten waveforms are selectable, including standard functions, such as sine, triangle, square, as well as positive and negative sawtooth, different pulses, and haversine. Seven modulation modes are available: • Amplitude modulation (AM) • Frequency modulation (FM) • Phase Shift Keying (PSK) • GATE • Linear SWEEP • Logarithmic SWEEP • BURST The 10-key section on the right of the front panel permits a versatile activation and control of such functions as single or continuous sweep or burst, sweep hold, and switching from internal to external modulation or trigger source; further asymmetrical waveforms with variable duty cycle, key for instant return to symmetrical waveform, store and recall keys for up to nine complete instrument settings, a DIAL LOCK key to disable the rotary control, and a key for switching the signal output impedance. AC or DC amplitudes can be precisely set using the numeric setting rotary knob. DC offset is set independently of the AC output amplitude. The output signals phase noise and residual FM are very low, ensuring a clean and stable signal. The instrument is optionally available under type number PM5139/02 with a built-in GPIB (IEEE bus) interface and under number PM5139/03 with built-in RS-232 interface. All instrument functions can be remotely activated from a PC or test system controller. It is also possible to upload settings and status data from the instrument for storage in the controller and later recall at any time. The facility IEEE bus makes PM5139 an integral part of an automated test system. The PM5139 with interface also offers a user-definable ’’arbitrary” waveform ARB: the desired waveform may be programmed on the PC, and than downloaded to the generator via interface. Twenty-four arbitrary waveforms can be stored separately. A test program is built in to provide customer support and to facilitate servicing. The PM5139 is very much suited for applications in research and development, production monitoring, quality assurance, and for service purposes.