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1123-A: Difference between revisions
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The first sync output is used to trigger an oscilloscope, which displays the Loran C (or WWV signal). | The first sync output is used to trigger an oscilloscope, which displays the Loran C (or WWV signal). | ||
The delay of the second pulse is adjusted with the 1123A controls to be coincident with a peak or a zero crossing of the reference signal, e.g. Loran-C. | The delay of the second pulse is adjusted with the 1123A controls to be coincident with a peak or a zero crossing of the reference signal, e.g. Loran-C. | ||
A pulse train derived from the 100-kHz input is divided down to produce a 1-pulse-per-second master tick and timing pulses at 100 kHz, 10 kHz, 1 kHz, 100 Hz, 10 Hz, 1 Hz, and 0.1 Hz. | |||
These signals also operate a five-digit recognition circuit to produce an 8-millisecond pedestal, occurring at 1 pps. | |||
This pedestal can be delayed by a precise amount of time with respect to the master tick, 0.00000 through 0.99999 s selected by thumbwheel switches. | |||
Pedestal and a sync pulse are provided for comparisons of the master tick with WWV-type transmissions on an oscilloscope screen. | |||
For intercomparisons where greater time resolution is possible (e.g., Loran C), a 1-MHz input is used to drive a delay circuit (0 to 9 microseconds in 1-microsecond steps, 0 to 1 microsecond continuously), which produces a 0.2- | |||
microsecond marker controlled by the last two front-panel thumbwheels. | |||
==Specifications== | ==Specifications== | ||