Wavetek Model 191 20 MHz Pulse/Function Generator

The Wavetek Model 191 is a 20 MHz pulse/function generator that produces sine, triangle, square, normal pulse, double pulse, and DC outputs. It delivers variable amplitude from 30 Vp-p (15 Vp-p into 50Ω) down to 1.5 mVp-p across a frequency range of 0.002 Hz to 20 MHz. The instrument operates in continuous, triggered, and gated modes, with independent pulse generation capabilities including adjustable width, delay, and dual-pulse modes. Symmetry control enables sawtooth waveforms and duty cycles from 1:19 to 19:1.

– Technical Specifications

Main Generator
• Waveforms: Sine, triangle, square, normal pulse, double pulse, and DC
• Frequency range: 0.002 Hz to 20 MHz across nine decade ranges with vernier adjustment
• Frequency accuracy: ±3% of full scale (0.1 Hz to 1 MHz); ±5% of full scale (10 MHz range)
• Amplitude: 30 Vp-p to 1.5 mVp-p; 15 Vp-p into 50Ω
• Amplitude stability vs. frequency: <±0.2 dB (DC to 100 kHz); <±0.5 dB (1 MHz); 100 ns); 50% (20 ns to 100 ns)
• Pulse/burst sync output: TTL-level, 50Ω terminated

Burst Generator
• Operation modes: Continuous, triggered, and gated
• Burst rate: 1 Hz to 5 MHz across seven ranges
• Burst width: 20 ns to 100 ms across seven ranges

– Key Features

• Nine overlapping frequency ranges enable ultra-low to 20 MHz operation
• Symmetry control produces sawtooth and asymmetric waveforms
• Independent pulse and burst generators with synchronization outputs
• Triggered and gated operation modes for external control
• 80 dB DC offset adjustment range

– Typical Applications

• Electronic circuit testing and characterization
• Device development and validation
• Educational laboratory demonstrations
• Pulse train generation for logic and analog circuits

– Compatibility & Integration

TTL-compatible synchronization outputs enable integration with external trigger and gate circuits. 50Ω source impedance accommodates standard RF/microwave measurement systems.