1656

The General Radio 1656 Impedance Bridge was introduced in Catalog U (1970) and remained available through Catalog 1978.

It is last in a long line of manual impedance bridges starting with 650-A in 1933.

The 1656 features a built-in generator and detector, with side-panel connections for external ones. The new CRL device that displays results in a digital format was a collaboration between Oak Manufacturing and General Radio. The DQ dial is of the conventional design.

The 1656 is powered by five D-cells – four for the generator/AC detector, and one for the DC detector. Both batteries can be checked by the front panel function switch.

Specifications

• Ranges:
  • Capacitance: 0.1 pF to 1100 μF, series or parallel, 7 ranges
  • Inductance: 0.1 μH to 1100 H, series or parallel, 7 ranges
  • Resistance: 0.1 mΩ to 1.1 MΩ, AC or DC, 7 ranges
  • Conductance: 0.1 nS to 1.1 S, AC or DC, 7 ranges
• Basic Accuracy: 0.1% (see manual)
• Generator: Internal, 1 kHz ±2% AC, 1.5 V DC; External, 20 Hz to 20 kHz AC

Links

• Experimenter describing Type 1656 March 1970

Photos

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