Fields at Work GmbH, Hegibachstrasse 41, 8032 Zürich, Schweiz
2019 Fields at Work GmbH, Zurich
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ExpoM - RF manual rev. 2.3
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3.2.
Setting a marker
The Marker button on the top of the device can be used to flag single measurement samples. The
flagged samples are highlighted by means of an ascending marker number visible in the
measurement results after download. The marker number can be reset with ExpoM - RF utility on
the PC (see chapter 0).
4
Battery management
4.1.
Charging the battery
The USB interface is used to recharge the internal battery or power the device from an external
power source. Unless it is already fully charged, the battery is recharged as soon as the device is
connected to a powered USB source (Wall adapter, PC, laptop etc.). Any compliant USB port and
chargers providing at least 1000 mA can be used for this purpose.
While ExpoM - RF is charging the battery, the multi-color LED lights solid red. At the end of the
charging cycle the red light turns off.
Important Notice:
Using USB chargers that do not fulfill the USB dedicated charger port specification
can lead to incomplete and slow charging process of the batteries.
It is strongly recommended to
use an USB charger with a current rating of at least 1A (1000mA)
. More information about suitable
USB charger types for ExpoM - RF can be obtained from the distributor.
Important Notice:
Although it is possible to perform measurements while charging ExpoM - RF it is
inadvisable to do so. The charging cable falsifies the antenna characteristics, reducing the
measurement accuracy. Frequency bands below 1 GHz are particularly susceptible to this effect.
Important Notice:
At environmental temperatures above 45°C ExpoM - RF should not be charged.
Direct exposure to sunlight during the charging process should be avoided.
Note:
The actual charging time depends on the charger model and the type of USB cable used. Long
and / or thin USB cables can significantly increase the required charging time regardless of which
type of charger is used. It is recommended to the USB cable provided with the device.
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