auxiliary output feeds so that unattended readings can be obtained by
means of data logging or chart recording equipment. The automatic
instrument offers great advantages over oscilloscope methods of
measurement due to the simplicity of operation and the absence of
subjective influence on the reading. The data logging facility has
proved very useful in providing detailed performance measurements of
unattended transmitters over a long period of time. A modified version
of the instrument will enter production in 1978 and approximately 50
units will be made.
A general need exists in both Operational and Specialist departments for
particularly important at unattended sites such as transmitters.
Important BBC requirements cannot be met by available commercial
equipment, without extensive modifications, so the instrument
illustrated has been developed. It provides a means of continually
monitoring the condition of a number of data circuits and recording the
information by printing it onto a paper roll.
Each print consists of data together with the time at which the data was
logged. Printing can be commenced at pre-programmed times or when a
change of input state, (e.g. a fault condition) occurs. The condition
obtained immediately before the change is also printed.
The equipment is self-contained and can
from internal re-chargeable batteries,
approximately twelve hours, depending on
be powered from the mains or
in the event of portable use or
operate the equipment for
the print rate.
Modification of Advance Oscilloscope OS3300B
Despite the increasing influence of digital techniques there is a
continuing need for high grade oscilloscopes in broadcast engineering,
particularly for use by Transmitter Maintenance Teams. One requirement
is for a dual purpose instrument which will provide both specialised
television measurement facilities and the general facilities which are