This instrument generates wide-band
noise of uniform spectrum level, particularly useful for noise
and vibration testing in electrical and mechanical systems. The
noise output of a gas-discharge tube is amplified and shaped with
low-pass filters to provide ranges to 20 kHz, 500 kHz, and 5 MHz
The output level is controlled by a continuous attenuator followed
by a 4-step attenuator of 20 dB per step and is metered from over
3 volts to below 30 microvolts. When the attenuator is used, the
output impedance remains essentially constant as the output level
is adjusted
Use the 1390-B as a broad-band signal source for:
- frequency responses - drive device under test with 1390-B
and analyze output with any of several GR analyzers, manually
or with the GR 1521-B Graphic Level Recorder.
- Intermodulation and cross-talk tests
- Simulation of telephone-line noise
- Measurements on servo-amplifiers
- Noise interference tests on radar
- Determining meter response characteristics
- Setting transmission levels in communication circuits
- Statistical demonstrations in classroom and lab
Acoustic Measurements
- Frequency response
- Reverberation - use 1390-B with a GR analyzer as source of
narrow-band noise
- Sound attenuation of ducts, walls, panels or floors
- Acoustical properties of materials
- Room acoustics
Or use with an amplifier to drive:
- A loudspeaker for structural fatigue tests in high level acoustic
fields
- A vibration shake-table
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