8
Chapter 2
Unpacking and Installing
Inspection
If the shipping carton is damaged, request that the carrier's agent be present when the unit is
unpacked. If the instrument appears damaged, the carrier's agent should authorize repairs before
the unit is returned to the factory. Even if the instrument appears undamaged, it may have
suffered internal damage in transit that may not be evident until the unit is operated or tested to
verify conformance with its specifications. If the unit fails to operate or fails to meet the
performance specifications of Chapter 3, notify the carrier's agent and the nearest Valhalla Sales
Office. Retain the shipping carton for the carrier's inspection. DO NOT return equipment to
Valhalla Scientific or any of its sales offices prior to obtaining authorization to do so.
Power Requirements
The standard Model 4021 is fitted for operation from an AC power source such as municipal AC
line power. It may also be modified for operation from an internal rechargeable battery pack.
Battery operation is indicated by the lack of an AC power cord receptacle on the rear of the
instrument.
For AC operation
,
the 4021 is shipped from the factory for operation at either 115VAC or
230VAC, 50 to 400 Hz. This voltage range is preset at the factory and should be specified when
placing the order. All units are wired for 115VAC unless otherwise noted. When 115VAC is
selected, the unit will operate at line voltages of 105 to 125 volts. If 230VAC is indicated, the
unit will operate at line voltages of 210 to 250 volts.
The rear panel line fuse value is 0.1A Slo-blo.
Battery operation
is indicated by the presence of a battery charging jack on the rear panel of the
instrument. In this case, the 4021 uses four (4) rechargeable nickel-cadmium batteries as its
source of power. A battery charger is supplied with the 4021. The 4021 may be operated from
the batteries for approximately 12 hours before requiring a recharge. The 4021 may also be
operated directly from the charger if desired, or if batteries have become depleted. Use only the
charging adapter provided or its equivalent to avoid internal damage. The line fuse installed for
battery operation is a 2 amp Fast-blo fuse.
Note:
As a rule of thumb, the instrument requires twice as much time to recharge as the time it
was in operation. (i.e. 4 hrs. charge for 2 hrs. use)
Installation
If the Model 4021 is to be used in the bench-top configuration, installation requires only that the
line cord be connected to the rear panel connector and the other end inserted into the appropriate
wall receptacle. A rear- panel mounted fuse provides protection for the internal circuits.
