Seaward DP6 - Manual (Page 5)

Operating Instructions Thermocouple Calibrator Type DP6
4
GENERAL
The DP6 is delivered complete with battery charger and comes fully charged ready
for use. Before operating, read these instructions carefully. They will guide you
through the operation and help you to get the best possible results.
After unpacking, inspect for physical damage and immediately report any defects in
writing, retaining packaging materials for inspection.
The DP6 is a highly accurate portable calibrator designed for the measurement of
the outputs from thermocouples and all mV transducers as well as the simulation of
thermocouples and mV signals.
The right hand two-line alphanumeric display shows the instrument status and
programming options. The left hand display is a 4-
1 ⁄
2
digit LCD which indicates the
measured or sourced value. The sealed switch membrane which forms the front
panel, incorporates all the function keys necessary for configuration.
The plug top charger supplied with the instrument is a two-stage charger and can
therefore be used for bulk and float charging. Safety circuits built into the DP6
ensure that the lead acid battery cannot be discharged below a pre-set value. This
ensures that the maximum battery life will be achieved.
WARNING: Before starting any maintenance, repair or
exchange of parts, the instrument should be disconnected
from the charger and any mains power source.
BATTERY CHARGING
The DP6 has a built-in sealed lead-acid battery which is fully charged when
delivered. This type of battery has advantages over other types of rechargeable
batteries; it is more tolerant of erratic charging cycles thus giving better service life.
When the battery reaches a low charge state "LO BATT" appears in the top left hand
corner of the value display, indicating that approximately one hour's further
continuous use is possible. Before the battery reaches a deep discharge state which
could be detrimental to its long-term performance, a protection circuit is
automatically activated, shutting down the DP6. The displays will blank and no
further operation will be possible until the charger is plugged in and charging
current provided.
The charger supplied with the DP6 is of a plug-top style and models are available for
most countries. It is a two-stage charger providing bulk charge for fully discharged
batteries, automatically switching to trickle charge state to maintain the battery at
full charge level. The DP6 may be used with the charger permanently connected.