1656
The General Radio 1656 Impedance Bridge was introduced in 1970 Catalog U 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
