Note: The output frequency of the SA.22c is more accurate than most counters. Appropriate
measurement equipment can be obtained from Microsemi. Inquire with Microsemi marketing, or your
local sales representative, about Microsemi line of test and measurement standards.
4.2 Start-Up Sequence
When power is connected, the SA.22c begins its warm-up cycle. After few minutes, the rubidium
oscillator reaches a locked condition and its output signals stabilize. The accuracy at shipment is
<±5 × 10 at 25 °C, typical.
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Note: Signals appear at the outputs immediately after power is applied to the unit, but these output
signals are not stable until the oscillator is locked.
After 7.5 minutes, the accuracy of the SA.22c oscillator is <1 × 10 . Performance of the SA.22c unit
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varies according to the application profile specified at the time of order. For information about
application profiles and unit performance, see the SA.22c Product Specification.
To monitor the performance and selectively of the unit, modify using the MSIP firmware included in the
unit and connect the unit to the COM port of a PC running Windows.
Figure 8 • Sequence of Start-Up Events
Note: The service signal can be active high or active low depending on the unit configuration.
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