Chapter 2
Unpacking and Installing
2.1 Introduction
Valhalla Scientific Model 2105 is accurate, reliable low-cost power measurement devices
designed to aid engineering, production test, and quality assurance departments in
determination of product power consumption from DC and AC power sources. The instruments
feature dual independent digital displays. The left display provides a continuous indication of
true power in watts. The right display is switch-selectable between amperes (true RMS) or volts
(true RMS).
Model 2105 provides a fast and convenient method of determining product efficiency, power
factor, and true RMS current draw. Phase angle relationships may be calculated through
manipulation of the displayed quantities.
2.2 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, 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.
2.3 Line Voltage/Fuse Selection
The switch on the rear of the 2105 is used to configure the power analyzer for operation at
different AC line voltages. The supply voltages and their corresponding fuses are listed below:
105 to 125 VAC, 50-400Hz = .250 Amp Slo-Blo
210 to 250 VAC, 50-400Hz = .125 Amp Slo-Blo
Note that this switch is for the internal operating voltages required by the power analyzer, and
should not be confused with the input voltage selectors on the front of the instrument.
2.4 Bench Use
The 2105 is delivered for operation in bench use and special instructions for use in this manner
other than the procedures of Section 4 are not required.
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