It is possible to run the counter from an optional battery supply, Option 23/90. You must charge the battery before use or
storage. The counter charges the battery automatically when connected to line power or an external DC source,
whether the instrument is in standby or turned on. See the specifications for charging time in different modes of
operation.
2.3.3.3. Grounding
Grounding faults in the line voltage supply will make any instrument connected to it dangerous. Before connecting any
unit to the power line, you must make sure that the protective ground functions correctly. Only then can a unit be
connected to the power line and only by using a three-wire line cord. No other method of grounding is permitted.
Extension cords must always have a protective ground conductor.
CAUTION: If a unit is moved from a cold to a warm environment, con-
densation may cause a shock hazard. Ensure, therefore, that the
grounding requirements are strictly met.
WARNING: Never interrupt the grounding cord. Any interruption of the
protective ground connection inside or outside the instrument or
disconnection of the protective ground terminal is likely to make the
instrument dangerous.
2.3.3.4. Orientation and Cooling
The counter can be operated in any position desired. Make sure that the air flow through the ventilation slots at the top,
and side panels is not obstructed. Leave 5 centimeters (2 inches) of space around the counter.
2.3.3.5. Fold-Down Support
For bench-top use, a fold-down support is available for use underneath the counter. This support can also be used as a
handle to carry the instrument.
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