THE DTMB FOUR-CHANNEL OSCILLOGRAPH TYPE 214 DESIGN DETAILS AND OPERATING INSTRUCTIONS.
Research and development rept.,
DAVID TAYLOR MODEL BASIN WASHINGTON D C
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The report describes a four-channel, cathode-ray oscillograph. Two types of plug-in preamplifiers are described. One type is direct coupled and chopper stabilized with an overall sensitivity of 10 mv peak to peak per in. The other type of preamplifier is resistance-capacitance coupled and may be used with balanced or unbalanced inputs. The overall sensitivity with this preamplifier is 5 mv peak to peak per in. The design of the oscillograph is such that two four-channel units may be stacked for the simultaneous recording of eight signals on a drum camera using 70-mm film. Single, driven, and recurrent sweep circuits are provided so that all conventional methods of oscillographic recording may be used. A precision timing circuit is included to supply accurate time-interval marks on still or moving film records. Fifty-kc sine waves at an amplitude of 1 in. peak to peak on the cathode-ray-tube screen are discernible on super XX film at drum speeds up to 1250 ips. In addition to the circuit description, the report contains operation and maintenance instructions, photographs, and schematic wiring diagrams. Author
- Test Facilities, Equipment and Methods