Their extensive signal simulation capabilities include trigger generator, arbitrary waveforms, pulse/pulse train generator, function generator, tone generator, amplitude modulation source, and sweep generator.
The 280 Series Waveform Generators use variable clock sampling and Direct Digital Synthesis techniques technology to create a robust programmable function and arbitrary waveform capability. The 281, 282 and 284 are 40 MS/s arbitrary wave form generators with one, two, and four channels, respectively. Each channel can be operated fully independently, or multiple channels can be linked using complex or simple relationships.
Waveform Manager Plus Software provides all the features needed for creation, management, and manipulation of arbitrary waveforms in a single Windows based program.
Standard waveforms
The output frequency range is 0.1 mHz to 16 MHz for sine and square and up to 100 kHz for triangle, ramps and sine(x)/x. Rise time for pulse is < 25 ns with a period range of 100 ns to 100 s. Output amplitude range can be adjusted from 2.5 mV to 10 V pk-pk into 50 Ohms.
Versatile pulse generator capabilities
Each channel can generate complex pulse trains and regular pulses. A pattern of up to 10 pulses can be defined quickly with each pulse having its own amplitude, delay, and width. The entire pulse train pattern can be replayed at a user defined rate of repetition. Where variable rise time pulses are needed, the full arbitrary function can be utilized.
The 280 series are very sophisticated 12 bit arbitrary generators capable of reproducing almost any waveform. True variable clock architecture is used with clock speeds between 0.1Hz and 40 MHz. This architecture eliminates clock jitter attributed to DDS arbitrary generators and allows waveform linking, sequencing, and looping. Waveforms may be defined with a maximum of 4096 vertical points and from 4 to 65,536 horizontal points. Arbitrary waveforms can be replayed at a specified waveform sample rate, frequency, or period. Up to 100 user defined waveforms can be stored within the instrument’s 256K of nonvolatile memory.
Linked sequence operation
Up to sixteen arbitrary waveforms may be linked in a sequence. Each waveform can have a loop count of up to 32,768 and the whole sequence can be repeated or run continuously over a million times. For multi channel models, waveforms on different channels can be looped and daisy chained. By summing the channel outputs, up to 64 segments can be used to create highly complex waveforms.
Multi channel phase locking
Any number of channels can be phase locked with offsets defined to a resolution of 0.1 degree (or 360 degrees/waveform points for arbitrary waveforms). For applications requiring more than four channels, multiple generators can be phase locked. The 280 series also has the facility for phase locking to another generator.
Multi channel Summing
Waveform Summing sums the waveform from any channel into the next channel. Alternatively any number of different channels can be summed with an external signal. This allows complex modulations to be created such as noise superimposition.
Inter channel triggering and modulation
Because any channel can be triggered by the previous or next channel, waveforms on different channels can be ‘daisy chained’ and looped. By summing the channel outputs, up to 64 segments can be used (32 segments for 282). A channel can be used to SCM modulate another channel or AM modulate.
Wide frequency sweep range
All waveforms can be swept over their entire frequency range at a rate variable between 30 milliseconds and 15 minutes. Sweep can be logarithmic or linear, continuous or single. Single sweeps can be triggered from the trigger input, front panel, or digital interfaces. Multiple channels can be swept simultaneously.
Amplitude modulation
Suppressed Carrier Modulation and Amplitude Modulation are available for all waveforms. Any channel can be used to modulate another channel. Alternatively all channels can be modulated simultaneously using the modulation input.
Built in trigger generator
All waveforms are available as a triggered burst whereby each trigger edge will produce one burst of the carrier. Start and stop phase is fully variable. Both Gated and Triggered modes can be operated from an adjacent channel, the internal trigger generator, a key press or remote command, or an external source. The trigger generator signal is available as a separate output if needed.
Tone switching
The 280 series can provide triggered switching between up to 16 frequencies of arbitrary or standard waveforms. Tone switching modes can be triggered, FSK, or gated using any trigger source. By combining two channels together it is possible to generate precise DTMF test signals.
Windows based waveform editing
Each generator comes complete with sophisticated Windows based software for the management, editing, and creation of waveforms. The software can be used to create arbitrary waveforms using equations, drawing tools, or both together. Real world waveforms imported from DSOs or other sources can be combined and modified with other waveforms using editing functions. A library of standard waveforms is included which can be used as elements when modifying or creating waveforms. A powerful Equation Editor provides an array of mathematical functions including geometric and logarithmic operands. Waveform editing and creation and can make use of drawing tools in combination with insertion, manipulation, and equations. Multiple waveforms can be further combined using mathematical operators to create new waveforms.
Import from DSOs and other instruments
The Windows software incorporates direct support for uploading waveforms from Tektronix digital oscilloscopes. A driver for LabWindows CVI from National Instruments is available which enables imports from other equipment to be achieved within the LabWindows environment.
Fully programmable via RS-232 or GPIB
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