1390-B
The General Radio 1390 Random Noise Generator , introduced in 1961 Catalog Q and available to Catalog GR1978. The Type 1390-B provides random noise on three ranges from 20 kHz to 5 MHz. It produces electrical noise using a 6D4 gas-discharge tube then two stages of amplification. Between the amplifier stages filter networks shape the three bands. A voltmeter displays RMS voltage then fed to a five position attenuator.
Specifications
- Frequency Range: 5 Hz to 5 MHz in three bands.
- Output Voltage: 3 V for 20 kHz range, 2 V for 500 kHz range, and 1 V for 5 MHz range.
- Output Impedance: 900 Ω
- Output Attenuator: 1, .1, .01, .001, and .0001 times the RMS Voltmeter reading.
Manuals
