VME ARBITRARY WAVEFORM
GENERATOR
The module is ideal for
- Simulation of sensor signals from complex rotating machines.
- Generation of pure and distorted polyphase AC waveforms, with all waveshape parameters (frequency, amplitude, phase, distortion components) smoothly variable in real time.
- Generation of complex pulse trains with realtime control of relative pulse positions and amplitudes.
- Shake table, servo, or actuator drive.
The V375 builds on the success of its predecessor, the Model V370, by extending the output bandwidth to 300 kHz and adding four inputs for user waveforms to sum into the channel outputs. A new burst mode allows software or external input to trigger generation of one or more waveform cycles.
- Four independent direct digital synthesizer (DDS) frequency sources allow smooth variation of waveform scan rates without requiring table reloads.
- Four versatile, memory-table-driven waveform generators scan up to 65,536 discrete points per waveform at up to 15 MHz point step rate.
- 16-bit amplitude resolution; 32-bit frequency resolution.
- Per-channel divisors allow simulation of fractional "gear-ratio" waveshapes.
- Output frequency, amplitude, phase, and DC offset are smoothly variable in real time.
- Output stage analog summing allows mixing of up to four programmed waveforms and one external analog input.
- Versatile wave memory partitioning allows waveform read/write operations concurrent with wave generation, so multiple waveforms can be loaded and selected in real time.
- Programmable waveform jump and triggered burst capability.
- Channels may be synchronized within a module or across multiple modules.
- Programmable lowpass filters are provided to smooth discrete sample points.
- Continuous-play (non-repetitive waveform) modes available.
- Onboard microprocessor performs macro commands: Fourier synthesis, pulse train generation, sweeping, and test functions.
| FUNCTION | 4-channel waveform synthesis VME module. | |
| CONFORMANCE | Conforms with ANSI/IEEE 1014-1987 VMEbus spec: A24:A16:D16; does not support byte write operations. |
|
| PACKAGING | Single-wide 6U Eurocard. | |
| DEVICE TYPE | 16-bit VME register-based slave: mplements 256 16-bit registers at switch-selectable addresses in the VME 16- or 24-bit addressing spaces. |
|
| OUTPUTS | Four channels of arbitrary waveform output: +/-10 volts peak, 50 ohm output impedance, 100 mA max. Bandwidth 300 kHz min.
Each output may be any selected sum of the four arbitrary waveform generators plus one external analog input. Four TTL-level sync pulses. |
|
| INPUTS | Four TTL-level auxiliary logic inputs, usable as output gates or burst triggers.
Four analog inputs for user waveforms, +/-10 volts peak. |
|
| WAVE MEMORY | 64K x 16 bits per channel; may be partitioned from one block of 64K points to 1024 blocks of 64 points. Wave memory is readable/writable from VME at all times. | |
| SYNTHESIZERS | Four direct-digital frequency synthesizers: 15 MHz max, 0.0093 Hz resolution, +/-0.005% accuracy. |
|
| CONNECTORS | DB25 female connector for signal outputs, trigger inputs, and user waveform.
20-pin ribbon cable for master/slave daisychain (16 modules maximum). Eight SMB connectors for monitoring waveform and sync outputs. |
|
| INDICATORS | LEDs indicate processor heartbeat and VME access. | |
| POWER | Standard VME supplies: +5 volts, 600 mA nominal +12 volts, 100 mA nominal (plus output load current) -12 volts, 200 mA nominal (plus output load current) |
|
| NOMENCLATURE | DDS frequency synthesizers: A, B, C, and D. Arbitrary waveform generators: 0, 1, 2, and 3. Output summer-amplifier stages: W, X, Y, and Z. |