Delta OHM HD37AB17D, Operating Manual

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HD37AB17D/HD37B17D
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V1.5
The power supply of the instrument is provided with a 2 Ni-MH rechargeable batteries
package (code BAT-20), that ensures over 8 hours of continuous working, in acquisi-
tion mode.
2. KEYBOARD AND LED DESCRIPTION
The instrument can have two working modes: the stand-by mode (signalled, every 5
seconds, by a short flashing of the led activity) in which the instrument is waiting to
be commanded and reduces the battery consumption to the minimum, and the
measurement mode (signalled, every 3 seconds, by a double long flashing of the
activity led) in which the instrument simultaneously measures all the parameters (RH,
T, CO, CO2) and memorizes them in its own internal memory with the set memoriza-
tion frequency. From stand-by mode you can always pass to the measurement
mode, pushing the button ON/OFF.
When it is connected to the PC, the instrument automatically goes in
measurement
modality .
Button ON/OFF
To switch the instrument on ( measurement mode ) press the button ON/OFF till the
Led Activity starts emitting two long and close flashings, so release the button.
To switch
the instrument off ( stand-by mode ) press the button ON/OFF till the Led
Activity starts emitting two long and close flashings, so release the button.
It’s not possible to switch the instrument off when it’s connected to the PC.
Led CHARGE
The led CHARGE offers the information about the charge state of Ni-MH rechargeable
batteries.
When the external power supply is connected, the instrument checks the rechargeable
batteries charge state and, if necessary, starts the charge operation.
The real charge can be preceded by a pre-charge phase; an inserted mode in order to
avoid exorbitant stresses of the batteries when they are particularly discharged or
their temperature is too low: in this phase the led CHARGE emits a flashing per sec-
ond.
After this first phase, the quick charge starts: The led CHARGE remains fixedly ON and
it switches OFF only if the charge is completed.
Now it’s possible to disconnect the external power supply and use the instrument us-
ing only rechargeable batteries.
Led ACTIVITY
The led ACTIVITY visualizes the working state of the instrument. Every 5 seconds, a
short flashing indicates the stand-by mode. At least every 3 seconds, a double flash-
ing indicates that the instrument is measuring.