Chapter 7 Installation
Cesium Beam Tube Replacement
Operating and Programming Manual 133
Cesium Beam Tube Replacement
Refer to the 5071A Assembly-Level Service Manual for information
about removal, replacement, and disposal of the Long-Life or High-
Performance Cesium Beam tube.
Long-Term Storage
PROLONGED PERIODS OF NON-OPERATION OF THE 5071A
CAN RESULT IN DECREASED CESIUM BEAM TUBE LIFE OR
PERMANENT TUBE DAMAGE. NEVER STORE THE 5071A
LONGER THAN SIX MONTHS WITHOUT PERIODIC (OR
CONTINUOUS) OPERATION.
You can safely store the 5071A for extended periods of time by leaving
the instrument connected to ac power and placing it into the Standby
Mode of operation. (Refer to page 26 for details.)
If you need to store the 5071A for extended periods without power, the
minimum amount of standby operation time required to maintain the
tube’s vacuum is 24 continuous hours for each six months of storage
time. Remember to physically disconnect the instrument’s internal-
standby battery before placing the instrument into prolonged un-
powered storage (see page 28 for more information). (Internal-standby
batteries do not apply for 48V option).
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