1620-A

The General Radio 1620-A Capacitance-Measurement Assembly was introduced in Catalog R (1963) and remained available through Catalog 1978.

The Type 1620-A Capacitance-Measurement Assembly is based on a compilation of Types 1240-A Oscillator/Null Detector and 1615-A Capacitance Bridge into a single unit. Early models were connected physically by bolting their aluminum end frames together. Later models were rack-mounted in a purpose-built cabinet.

Specifications

• See Type 1240-A for Bridge Oscillator and Amplifier/Null Detector specifications
• See Type 1615-A for Capacitance Bridge specifications

Links

• General Radio GR-1620A capacitance ratio bridge @ Fred PA4TIM's site
• GR-1620 operation @ YouTube
• Experimenter August 1962 describing Types 1615-A and 1620-A
• 1240-A Bridge Oscillator-Detector comprising
  • 1232-A Null Detector
  • 1311-A Bridge Oscillator

Photos

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  Type 1620-A Late

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  Type 1240-A Oscillator and Null Detector

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  Type 1615-A Capacitance Bridge

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