VWR 662-2351, Инструкция по эксплуатации

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5. THE METER‘S MAINTENANCE
The meter is equipped with a graphic touchscreen. The maintenance
consists in pressing particular keys and windows which appear on the
screen. Grey captions in the windows and keys inform that these elements
are not active in this particular operating mode. Particular keys, connected
with the measurement function (i.e.
or ) become active after
selecting the chosen function. To select, press the screen in a freely chosen
spot of the chosen function. Around this spot a frame will be displayed. To
deselect, press the spot again. If the chosen function has a possibility of
calibration, the
key becomes active. If it has additional parameters,
the
key also becomes active. The
key is the only key in the
meter that responds exclusively to a long press (about 2 sec.). It prevents
from accidental erase of the electrode calibration data.
Entering incorrect value, attempt of calibration when the meter doesn‘t
recognise the standard are signalised by a triple warning sound, irrespective
of the chosen sound settings.