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For several years, a high-value resistance measurement system of the modified Wheatstone bridge type is in operation at PTB. It is used for calibration of resistors with values in the range from 1 GΩ to 100 TΩ. Recently, the guarding and grounding of the bridge has been optimized to reduce measurement times and noise. This has enabled us to extend the range for calibration to 1 PΩ. The new guard and...
The calibration of time transfer links is mandatory in the context of international collaboration for the realization of International Atomic Time. In this paper, we present the results of the calibration of the GPS time transfer link between the Real Instituto y Observatorio de la Armada (ROA) and the Physikalisch-Technische Bundesanstalt (PTB) by means of a traveling geodetic-type GPS receiver and...
For a GPS calibration campaign between ROA and PTB a GTR50 time and frequency transfer receiver from ROA was chosen. The operation performance of GTR50 type receivers has been validated in long term operation during the last years. The travelling GTR50 was also tested in a sequence of shutdowns and restarts to detect time jumps and malfunctions just after the restart and during the following days...
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