Time Domain Metrology Study.
Final technical rept. on Phase 2, Jun 72-Jun 73,
SPERRY RESEARCH CENTER SUDBURY MASS
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The objective was to examine the capability of time domain measurement techniques in an automatic calibration system with applications at lower frequencies than in Phase 1, viz VHF frequency ranges and below. In earlier work, methods for calibrating passive microwave components over a broad microwave frequency range 0.4 to 10 GHz were discussed. A subnanosecond risetime pulse generator was used to excite the approximate impulse or step response of the network the response was measured using a very broadband dc - 18 GHz sampling oscilloscope coupled to a laboratory instrumentation computer fast Fourier transforms were then performed on the digitized responses to translate from time-to-frequency domains, yielding the network transfer function from a single waveform measurement. Insertion loss measurements on wideband coaxial attenuators showed excellent agreement between time domain results and frequency calibration values over the range 0.4 to 8 GHz.
- Test Facilities, Equipment and Methods