The Tektronix VX4750 is a single-channel VXIbus-compatible function generator module engineered for high-performance automated test systems and research environments. It generates sine, square, triangle, ramp, pulse, DC, and arbitrary waveforms up to 25 MHz with 1 ppm frequency accuracy. The module delivers programmable amplitude control, multiple modulation schemes (FM, PM, AM, PSK, FSK, PWM), and flexible sweep capabilities across its entire frequency range.
Technical Specifications
Waveform Generation
• Waveform types: Sine, Square, Triangle, Positive Ramp, Negative Ramp, Pulse, DC, Arbitrary
• Maximum output frequency: 25 MHz
• Frequency accuracy: 1 ppm
• Frequency sweep: Programmable across entire frequency range
• Output control: Continuous or gated for programmable cycle count
Amplitude & Output
• High impedance load: 0.0 to 11 Vp
• 50 Ohm load: 0.0 to 5.5 Vp
• Amplitude accuracy (0.001 Hz to 3 MHz, 50 Ohm): ±0.2 dB (±0.1 dB typical)
• Amplitude accuracy (3 MHz to 25 MHz, 50 Ohm): ±0.5 dB
• Amplitude flatness (0.001 Hz to 3 MHz, 50 Ohm): ±0.2 dB
• DC offset: Programmable
Modulation
• Types: FM, PM, AM, PSK, FSK, PWM (PWM applies to pulse waveform only)
• FM (external): 2 Hz to 5 MHz deviation range, 2 Hz resolution, 2 kHz bandwidth, ±1.414 V modulating signal
• AM (external): 2 kHz bandwidth, ±1.414 V modulating signal
• Modulation sources: Internal and external
Synchronization
• Internal reference: 10 MHz (1 ppm accuracy)
• Reference sources: VXI CLK10, external REF IN connector, internal 10 MHz
• Front panel REF OUT: Buffered 10 MHz reference or 33 MHz module clock (programmable)
• TTL outputs: SWEEP SYNC (end of sweep), MARKER FREQ (programmable), polarity selectable
Physical & Environmental
• Dimensions: VXI C size (262 mm × 353 mm × 30.5 mm)
• Weight: 2.38 kg (5.25 lb)
• Operating temperature: 0°C to +50°C
• Storage temperature: -40°C to +85°C
– Key Features
• Programmable frequency sweep over 25 MHz range with marker and sync outputs
• Dual-output amplitude capability for 50 Ohm and high-impedance loads
• Independent FM and AM modulation from external sources
• Module clock capability with flexible reference distribution
• VXI C-size form factor for mainframe integration
– Typical Applications
• Automated test equipment requiring multiple waveform generation
• Signal conditioning in RF and mixed-signal characterization
• Frequency sweep applications with phase-locked synchronization
• Modulation testing in communications systems
– Compatibility & Integration
The VX4750 fits any VXIbus-compliant mainframe. EMC compliance with EN 55011 Class A, EN 50081-1, EN 60555-2, and IEC 801 series standards (requires mainframe backplane shields per VXIbus Specification Rule B.7.45).
