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The performance of two commercial high-precision frequency-stability measurement systems, timing solutions 5110A time-interval analyzer and Quartz lock A7 frequency and phase comparator, has been compared with two laboratory dual-mixer time-difference (DMTD) systems developed at the institute of radio engineering and electronics (IREE), Prague, and istituto elettrotecnico nazionale "Galileo Ferraris" (IEN), Turin, respectively. Two BVA oscilloquartz 5 MHz oscillators with Allan deviation (ADEV) around 1×10-13 at averaging intervals 1 s to 30 s were used as test-signal sources. In terms of the best-measurement-capability (BMC), the compared systems have shown the background noise at 5 MHz of ADEV=4.2×10-14 at 1 s in IREE-DMTD, 4.4×10-14 in IEN-DMTD, 7.4×10-14 in A7, and 8.8×10-14 in 5110 A, respectively. The 5110 A analyzer behaved the best concerning the dependence on departures from the BMC conditions.
Date of Conference: 4-8 May 2003