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1620A "DewK" Thermo-hygrometer
User's Guide
5.5
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bottom LED indicates link state: off for no connection, amber for 10 Mbps, and
green for 100 Mbps. The top LED indicates link activity: off for no activity,
amber for half duplex, and green for full duplex.
Alarm Port - The alarm port allows external alarm indicators to be connected to
the instrument and activated when an alarm event occurs (see Section 7.4.1).
The port outputs 0V when inactive and 12V DC (up to 20 mA) when active.
The jack accepts a 2.5 mm two-conductor subminature plug (Switchcraft
#850). The sleeve of the plug is ground and the tip is positive.
DC Power Socket - The DC plug from the AC adapter plugs into the 12V DC
power socket to power the instrument. The jack accepts a 5.5 mm miniature
power plug (Switchcraft #S760). The outer conductor is ground and the inner
conductor is positive. The instrument may draw up to 0.5A.
Back Panel
The back panel contains the stand, power switch, battery compartment, and
product information, including serial number.
Stand - The stand can be used to prop up the thermo-hygrometer on a flat
surface.
Battery Compartment - The battery compartment holds a 9V alkaline battery
used as a backup power source to maintain continuous measurement during a
power outage (see Section 6.2, Battery).
Power Switch - The power switch turns the power on and off to the thermo-hy-
grometer, including power from the battery. Before disconnecting the AC
adapter from the instrument, switch the power off to prevent draining the
backup battery.
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