1603-A

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General Radio 1603-A
Z–Y impedance bridge
General Radio 1603-A Z-Y Bridge

Available from 1956 to 1968

Manuals
Catalog History
 Document Year Page
Catalog O 1956 34
Catalog P 1959 28
Catalog Q 1961 24
Catalog R 1963 31
Catalog S 1965 45
Catalog T 1968 69
(All manuals in PDF format unless noted otherwise)

The General Radio 1603-A is a Z-Y impedance bridge introduced in Catalog O (1956) that remained available through Catalog T (1968).

Known as the bridge that always has an answer, its claim to fame is that it can be balanced for any impedance connected to its terminals. The 1603-A is accurate at audio frequencies from 20 Hz to 20 kHz. It requires an audio oscillator and detector for operation.

The 1603-A directly measures the quadrature components of a complex impedance Z = R + jX, or a complex admittance Y = G + jB. The unknown Z or Y may lie in any of the four quadrants of the complex plane, since this bridge can measure both positive and negative values of R and G as well as X and B.

Specifications

  • Frequency Range: 20 Hz to 20 kHz
  • Impedance and Admittance: -infinity to +infinity
  • Accuracy (with unknown grounded): 1% (see manual)

Links

Photos