10
The instrument requires no control buttons and operates fully
autonomously when the battery is charged. It automatically
records all measurements in non-volatile memory at preset
intervals. There is one leD display that can indicate the following:
•
Green light flashing
every second –
PM1904
is connected
to a PC or charger USb port, battery is charging;
••
Green light indicates the full charged battery
;
•••
Green light flashing
every 10 seconds – the instrument is
operating normally and background radiation is below the
preset thresholds;
•
Red light
– indicates that
DER
or
DE
thresholds have been
exceeded. A single red flash every second means the
DER
threshold has been exceeded; a double red flash every second
means the
DE
threshold has been exceeded;
•
Orange light flashing
every 5 seconds – partial battery
discharge. Please connect PM1904 to a USb port to charge
the battery.
