Powering the VFC400-USB VFC400-USB User Guide 26
l
Using a commercially available 5V USB power supply (5W)
When supplied externally, the power symbol shows on the display.
Supplying the unit with external power allows you to use the internal AAA batteries
as a backup should external power be unavailable.
When you remove the external USB power the display briefly turns off.
Some low-quality USB power supplies are unable to deliver sufficiently
stable power to the VFC400-USB. Please use a power supply from a
reputable source that carries a UL or CE marking.
If the logger detects an unstable power source, the power symbol will
flash and the three tone sounder will sound.
In this case, the logger will not be powered by the external supply, but
remain powered by the AAA batteries instead. Please remove the supply
and replace it with one of better quality.
Low power operation
The VFC400-USB enters low power operation when no external power is supplied, and
the AAA batteries are empty.
In low power mode:
l
the audible alarm will sound only once, then be silent;
l
the display turns off after 30 seconds of inactivity, regardless of the setting made
in Control Solutions VTMC;
l
reviewing the data is not possible (however a mark will still be placed if the review
button is pressed);
l
the unit cannot be started via push button start, however, a recording in progress
can be stopped, and a scheduled date/time start will proceed; and
l
min/max values cannot be cleared.
To Next Page
Loading...
