User`s manual
PK2100
Appendix B: Specifications s B-7
Connectors
The ideal conductor for a screw clamp terminal is a single, solid conduc-
tor. However, bare copper can become oxidized, particularly if it is
exposed to air for a long time before installation. The oxide can increase
the resistance in the connection by ~20Ω, especially if the clamping
pressure is not sufficient.
Use tinned wires or clean, shiny copper wire to avoid this problem. If
multiple conductors or stranded wires are used, consider soldering the
wire bundle or using a crimp connector to avoid a loss of contact pressure
from a spontaneous rearrangement of the wire bundle at a later time.
Soldering may make the wire subject to fatigue failure at the junction with
the solder if there is flexing or vibration.
Environmental Temperature Constraints
No special precautions are necessary over the range of 050°C (32
122°F). For operation at temperatures much below 0°C, the PK2100
should be equipped with a low-temperature LCD that is specified to
operate down to -20°C. The heating effect of the power dissipated by the
unit (about 5watts) may be sufficient to keep the temperature above 0°C,
depending on the insulating capability of the enclosure. The LCD storage
temperature is 20°C lower than its operating temperature, which may
protect the LCD in case the power should fail, removing the heat source.
The LCD is specified for a maximum operating temperature of 50°C.
Except for the LCD, which fades at higher temperatures, the PK2100 can
be expected to operate at 60°C, or more, without problem.