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HP 5061B Cesium Beam Frequency Standard

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Product Description

HP 5061B Cesium Beam Frequency Standard

The design concept of the high-performance beam tube includes
unique HP designed dual-beam optics with higher beam intensity to
accomplish better short-term stability and greater immunity to effects
of shock and vibration. A 50 percent increase in resonance cavity
length without change in the overall beam tube size contributes to
better accuracy and settability because of the high Q of the narrower
resonant line width. This tube retains the unique cesium standard feature
of virtually no long term instability or aging.
The intrinsic accuracy is improved to ±2 X 10^-12 which provides an
excellent reference standard without need of calibration. If desired, as
in many timekeeping applications, two or more units may be calibrated
to determine the difference in rate or may be adjusted to the
same frequency. With the improved settability specifications of 1 X
10^-13 small changes in frequency are accomplished rapidly and accurately.
A provision for degaussing the tube without adversely affecting
the instrument operation allows removal of any residual magnetic
field in the tube. This is important in achieving the settability performance.
The short term stability specification is improved by a factor of ten
with this tube. The 5 X 10^-12 (1 s avg.) performance compares very
favorably with that of rubidium type standards which are noted for
their excellent short term stability. An important advantage from the
better short term stability is the capability to make measurements to
1 sigma precision of 1 X 10^-12 in about one minute compared to the
two hours required previously.

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