The Tektronix VX4790A is a VXIbus-compliant arbitrary waveform generator module that creates custom waveforms with up to 262,144 voltage samples at sample rates reaching 25 MHz. It operates from an internal or external clock source and includes pre-stored sine, square, sawtooth, and triangular waveforms for standard function generator applications. The module’s standout capability is real-time frequency and amplitude adjustment of stored waveforms without retransmitting data to the system controller.
Technical Specifications
Waveform Generation
• Waveform memory: Up to 262,144 voltage samples
• Sample rate: Up to 25 MHz
• Clock source: Internal or external
• Frequency range: 0.75 Hz to 25 MHz
• Pre-stored waveforms: Sine, square, sawtooth, triangular
• Programmable breakpoints: Supported for non-consecutive voltage samples
• Waveform repetition: Continuous or 1–255 cycles
Output Characteristics
• Output impedance: 50 ohm load capable
• Voltage ranges: ±10.22 V (5 mV resolution), ±5.11 V (2.5 mV resolution), ±0.1 V (50 µV resolution)
• Amplitude resolution: 12 bits
• Programmable attenuator: Percentage of full-scale output control
Filtering
• Low-pass filters: 5 MHz, 500 kHz, 50 kHz (selectable under program control)
– Key Features
On-board waveform memory eliminates the need for continuous data streaming from the controller. Three selectable output voltage ranges provide flexibility across low-signal and high-voltage applications. Programmable low-pass filtering addresses bandwidth requirements and noise reduction in real time.
– Compatibility & Integration
The VX4790A installs in a VXIbus mainframe and operates through GPIB controllers with NI-488.2M software support. System commands manage all waveform generation and output parameters.
