1304-B

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General Radio 1304-B
Beat frequency oscillator
General Radio 1304-B Beat Frequency Oscillator

Available from 1954 to 1970

Manuals
Catalog History
 Document Year Page
Catalog N 1954 154
Catalog O 1956 104
Catalog P 1959 104
Catalog Q 1961 100
Catalog R 1963 106
Catalog S 1965 132
Catalog T 1968 207
Catalog U 1970 229
(All manuals in PDF format unless noted otherwise)

The General Radio 1304-B Beat Frequency Oscillator was introduced in Catalog N (1954) and remained available through Catalog U (1970).

The Type 1304-B is a general-purpose, dual-range oscillator covering 0 to 20 kHz and 20 to 40 kHz. It has a built-in 60 dB attenuator and an output voltmeter.

The 1304-B can supply 1 W of output into a 600 Ω load, floating or grounded. There is a calibration function to zero-beat the oscillator output with the 60 Hz power line.

With the addition of the Type 1521-P15 Link Unit, the 1304-B can be coupled to the Type 1521-B Graphic Level Recorder.

Applications for the 1304-B include amplifier and speaker testing, frequency response plotting, and as a bridge source.

Specifications

  • Frequency Range: 20 to 40,000 Hz in two ranges
  • Calibration Accuracy: ± (1% + 0.5 cycle) after front panel calibration
  • Drift: The drift from a cold start is less than 7 cycles in the first hour
  • Output Voltage: Full-scale, open-circuit output voltages of 50 mV, 500 mV, 5 V, and 50 V
  • Output Impedance: 600 Ω, resistive, within ±2%
  • Harmonic Distortion: Total harmonic content less than 0.25% from 100 Hz to 10 kHz, less than 0.5% below 100 Hz, less than 1% above 10 kHz

Links

Photos