Hewlett Packard
8057A

The Hewlett Packard 8057 A Precision Noise Generator is an audio frequency noise generator producing pseudo-random signals, available at binary and Gaussian distribution outputs. These signals are repeated noise patterns of known content and duration.
Both white and pink noise with an equal RMS value can be selected by push buttons.
By producing a defined RMS value, the high stability of the output level allows the use of a directly calibrated attenuator with 0.1 dB resolution.
This makes the 8057 A a highly accurate noise source.

Output:

• White noise
  Frequency range: DC ... 26 kHz
  
• Pink noise
  Frequency range: 2 Hz ... 20 kHz
  
• Pseudo-random-binary-sequence
  Clock rate: 520 kHz
  
• Trigger

Input:

• External clock
  Gate

Please find a corresponding data sheet here.
Please find an enlarged image here.