This Synthesized Programmable Arbitrary Waveform Generator uses a combination of direct digital synthesis and phase lock loop techniques to provide high performance and extensive facilities in a compact instrument. It can generate a wide variety of waveforms between 0-1 mHz and 16MHz with high resolution and accuracy Arbitrary waveforms may be defined with 12 bit vertical resolution and from 4 to 65536 horizontal points. In addition a number of standard waveforms are available including sine, square, triangle, ramp and pulse. Arbitrary waveforms may be replayed at a user specified waveform frequency or period, or the sample rate may be defined in terms of period or frequency. Extensive waveform editing features between defined start and end points are incorporated, including waveform insert, point edit, line draw, amplitude adjust and invert. More comprehensive features are available using WaveForm DSP arbitrary waveform creation software supplied. Wave Form DSP is a powerful Windows-based design tool that enables the user to create waveforms from mathematical expressions, from combinations of other waveforms, freehand, or using a combination of all three techniques. Waveforms created in this way are downloaded via the RS232 or GPIB interfaces. Up to 50 waveforms may be stored with the length and name specified by the user. Waveforms may be strung together to form a sequence of up to four steps. Each waveform may have a user defined repeat count from 1 to 32768. All waveforms can be swept over their full frequency range at a rate variable between 30 milliseconds and 15 minutes. Sweep can be linear or logarithmic, single or continuous. Single sweeps can be triggered from the front panel, the trigger input, or the digital interfaces. A sweep marker is provided. Amplitude Modulation is available for all waveforms and is controlled from an external generator via the Ext VCA input. All waveforms are available as a Triggered Burst whereby each active edge of the trigger signal will produce one burst of the carrier. The number of cycles in the burst can be set between 1 and 1048575. The Gated mode turns the output signal On when the gating signal is true and Off when it is false. Both Triggered and Gated modes can be operated from the internal Trigger Generator (0.005Hz to 50kHz), from an external source (dc to 1 MHz) or by a key press or remote command. The signals from the REF IN/OUT socket and the SYNC OUT socket can be used to phase lock two or more generators. This can be used to generate multi-phase waveforms or locked waveforms of different frequencies. The generator parameters are clearly displayed on a backlit LCD with 4 rows of 20 characters. Softkeys and sub menus are used to guide the user through even the most complex functions. AH parameters can be entered directly from the numeric keypad. Alternatively most parameters can be incremented or decremented using the rotary control. This system combines quick and easy numeric data entry with quasi-analogue adjustment when required. The generator has, as standard, both RS-232 and GPIB interfaces which can be used for remote control of all of the instrument functions or for the down-loading of arbitrary waveforms; the GPIB interface conforms to IEEE-488.2. Standard Waveforms Sine, square, triangle, DC, positive ramp, negative ramp, sin(x)/x, pulse, pulse train, cosine, haversine and havercosine. Sine, Cosine, Haversine, Havercosine Range: 0.1mHz to 16 MHz Resolution: 0.1mHz or 7 digits Accuracy: 10 ppm for 1 year Temperature Stability: Typically <1 ppm/ºC. Output Level: 2.5mV to 10Vp−p into 50Ω Harmonic Distortion: <0.1% THD to 100kHz; <–65dBc to 20kHz <–50dBc to 1MHz, <−35dBc to 10MHz <−30dBc to 16MHz Non−harmonic Spurii: <–65dBc to 1MHz, <–65dBc + 6dB/octave 1MHz to 16MHz Square Range: 1mHz to 16MHz Resolution: 1mHz (4 digits) Accuracy: ± 1 digit of setting Output Level: 2.5mV to 10Vp−p into 50Ω Rise and Fall Times: <25ns Triangle Range: 0.1mHz to 100kHz Resolution: 0.1mHz or 7 digits Accuracy: 10 ppm for 1 year Output Level: 2.5mV to 10Vp−p into 50Ω Linearity Error: <0.1% to 30 kHz Ramps and Sin(x)/x Range: 0.1mHz to 100kHz Resolution: 0.1mHz (7 digits) Accuracy: 10 ppm for 1 year Output Level: 2.5mV to 10Vp−p into 50Ω Linearity Error: <0.1% to 30 kHz Pulse and Pulse Train Output Level: 2.5mV to 10Vp−p into 50Ω Rise and Fall Times: <25ns Period: Range: 100ns to 100s Resolution: 4-digit Accuracy: ±1 digit of setting Delay: Range: −99.99s to +99.99s Resolution: 0.002% of period or 25ns, whichever is greater Width: Range: 25ns to 99.99s Resolution: 0.002% of period or 25ns, whichever is greater Note that the pulse width and absolute value of the delay may not exceed the pulse period at any time. Pulse trains of up to 10 pulses may be specified, each pulse having independently defined width, delay and level. The baseline voltage is separately defined and the sequence repetition rate is set by the pulse train period. Arbitrary Up to 100 user defined waveforms may be stored in the 256K point non−volatile RAM. Waveforms can be defined by front panel editing controls or by downloading of waveform data via RS232 or GPIB. Waveform Memory Size: 64k points per channel. Maximum waveform size is 64k points, minimum waveform size is 4 points Vertical Resolution: 12 bits Sample Clock Range: 100mHz to 40MHz Resolution: 4 digits Accuracy: ± 1 digit of setting Sequence Up to 16 waveforms may be linked. Each waveform can have a loop count of up to 32,768. A sequence of waveforms can be looped up to 1,048,575 times or run continuously. Output Filter Selectable between 16MHz Elliptic, 10MHz Elliptic, 10MHz Bessel or none.