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microK
70/125 Thermometry Bridge
The original microK bridge (aimed at the secondary
calibration market) provided a solid platform on which to
develop the primary calibration bridges (microK 70 and microK
125). The design challenge was then to improve the performance
of our existing technology substantially in order to offer
the same performance as the AC bridges that were used in
this application. This required improving the linearity
of our ADC, which in turn meant reducing the timing jitter
to below 1ps (the time it takes electrical signals to travel
0.3mm). We also had to develop a completely new signal processing
technology (parallel analogue processing) in order to achieve
the extremely low input noise required. This technology
is unique to Metrosol and provides one of the key benefits
of its primary standard bridges.
Notes
from the microK Design Team
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