VIZ WR-550B Function Generator 120VAC 50-60Hz Benchtop VCO DC Offset Lab

VIZ WR-550B Function Generator 120VAC 50-60Hz Benchtop VCO DC Offset Lab

The VIZ WR-550B is a benchtop analog function generator made by VIZ Manufacturing Co. of Philadelphia, Pennsylvania. It produces multiple waveform types — sine, square, triangle, and pulse — with a frequency range spanning 1 Hz to 100 kHz across selectable decade ranges. A front-panel VCO (Voltage-Controlled Oscillator) input allows external frequency modulation, and a DC offset control lets the user shift output waveforms above or below zero volts.

Specifications & What's Included

• Manufacturer: VIZ Mfg. Co., Philadelphia, PA 19144
• Model: WR-550B
• Part Number: 9451-404
• Type: Analog Benchtop Function Generator
• Power Input: 120 VAC, 50-60 Hz, 10 Watts
• Waveforms: Sine, Square, Triangle, Pulse (front-panel function selector)
• Frequency Range: 1 Hz to 100 kHz (decade-switched: 1, 10, 100, 1K, 10K, 100K)
• Output: Adjustable level via front-panel knob; banana jack output terminals
• 4V Fixed Output: Dedicated fixed 4V output terminals on front panel
• DC Offset Control: Selectable — 0, -20V, -5V, +5V positions
• VCO Input: Front-panel VCO input terminal for external voltage-controlled frequency sweep
• INT Switch: Internal/external modulation selector on front panel
• Power indicator: LED on front panel
• Enclosure: Steel chassis, blue finish, tabletop/benchtop form factor
• Country of Manufacture: United States
• Included: Unit only — no accessories or manual included

Applications

The VIZ WR-550B is a classic analog function generator from the 1970s–1980s era, designed for electronics lab, educational, and bench test applications. Function generators of this type are used to inject test signals into circuits for troubleshooting, frequency response testing, filter characterization, and general electronics development. The VCO input makes this unit suitable for swept-frequency testing and basic FM modulation experiments. It is well suited for electronics education, vintage equipment servicing, hobbyist labs, and any bench setup requiring a straightforward multi-waveform analog signal source in the 1 Hz to 100 kHz range.