The calculations below show how this figure is arrived at for each type of
oscillator:
6.2.1. OCXO
Oscillator aging specification: <5E-10/day <5E-8/year
Oscillator electrical control range: ± 5E-7
Years to reach limit of electrical control: 5E-7 / 5E-8 = 10 years
6.2.2. Rubidium
Oscillator aging specification : <2E-12/day <5E-10/year
Oscillator electrical control range: ± 5E-9
Years to reach limit of electrical control: 5E-9 / 5E-10 = 10 years
6.3. Keypad (optional)
When operating the front panel keypad, care should be taken not to use
sharp objects for selecting the various functions as damage to the keypad
can be caused.
The keypad is a replaceable item complete with the front panel overlay. If
it becomes necessary to replace the keypad, the complete assembly must
be replaced.
6.4. Vacuum Fluorescent Display
The vacuum fluorescent display has an MTBF of 20,000 hrs
(approximately 2.25 years). For this reason the unit employs a special
“blanking” function on the display. This function disables the display when
not in use, to preserve display lifetime. If it becomes necessary to replace
the display it is a straightforward operation as the display assembly is a
plug in assembly, designed to be removed by undoing the four securing
screws.
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