The Advance Type B4 Signal Generator is available in two
the B4A and B4B, each providing a wide frequency range with
frequency and output voltage calibration.
The frequency ranges are 100 kc/s to 80 Mc/s on B4A, and 30
30 Mc/s on B4B. The accuracy of frequency calibration is ± 1% A
linear scale and vernier are provided to give very close
Due to the use of a crystal voltmeter followed by our type
frequency resistive attenuator, the output is measured to ±
(1 dB + 2%
The signal can be modulated internally at 400 c/s from 0 to
modulation, also O to 80%, may be applied up to 30 kc/s into
the B4A and up to 10 kc/s into the B4B. Both internal and
modulation depths are monitored.