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                                    The Advance Type B4 Signal Generator is available in two
versions,
the B4A and B4B, each providing a wide frequency range with
accurate
frequency and output voltage calibration.
The frequency ranges are 100 kc/s to 80 Mc/s on B4A, and 30
kc/s to
30 Mc/s on B4B. The accuracy of frequency calibration is ± 1% A
linear scale and vernier are provided to give very close
resetting accuracy.
Due to the use of a crystal voltmeter followed by our type
A.38 high
frequency resistive attenuator, the output is measured to ±
(1 dB + 2%
F.S.D.).
The signal can be modulated internally at 400 c/s from 0 to
80%. External
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
external
modulation depths are monitored.