BARTINGTON INSTRUMENTS
DCN1040
Page 8 of 39 OM3100/2
The units are housed in a polycarbonate enclosure. Connectors on the front panel provide
connection to the Grad-13 and to a PC for digital output, with a socket for the charger input.
5.3. Power Supply
The battery box contains a lithium ion battery with a nominal voltage of 26V and an energy
density of around 72Wh. It is capable of powering a single Grad-13 for up to 16 hours, and two
Grad-13s for up to eight hours.
The On/Off power switch light will flash when the battery is around 80% discharged. The length
of time taken to discharge to this level depends upon the number of gradiometers connected, the
battery age, and the battery temperature.
WARNING
: The mains supply to the charge must be switched off before connecting or
disconnecting the charger to the Grad-13 battery box.
5.3.1. Charging
The battery charger supplied with the battery box is shown below. The mains input socket is at
the rear. The charge input voltage range is 100-240V, so no voltage selector switch is required.
The front panel of the changer includes a yellow/green LED, which indicates power and charging
status.
At swtch-on the LED flashes yellow/green and then indicates the following statuses.
LED