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GA10218_0101 - 5/2002
rently measured value as the “zero level”. However, the internal zero level
setting as in use remains unchanged.
After operating the zero button, only that amount of the currently measu-
red value is substracted so that the display limit is just reached. The dis-
played results of a leak rate measurement will be too high by an amunt
which corresponds to the display limit. Thus also increases in the leak rate
will be visible, which are less than the display limit. Here the internal zero
level is not changed.
It is not possible to reduce the detection limit of the instrument by pres-
sing the ZERO-button. The ZERO function is cancelled by pressing the
ZERO-button once more. The ZERO function is also cancelled automati-
cally as soon as the STOP/VENT-button is pressed.
The ZERO function has an effect on all output devices such as display,
chart recorder, triggers and RS232 interface.
Acoustic signal The acoustic signal is used to indicate the leak rate. An acoustic signal is
also generated in the case of warning and error messages.
The volume of the acoustic signal can be increased by operating the but-
ton to the left of the loudspeaker. With the button to the right of the
loudspeaker the volume of the acoustic signal may be reduced.
To check this, a signal will be output at the selected volume for 2 seconds
after operating the button. At the same time the volume is indicated on the
seven segment display on the hand unit (Fig. 13/4).
4.1.7 Displays on the Remote Control
Measurement range Here the leak rate is indicated as a bar. In case of a range overflow, the
upper arrow at the bargraph on the hand unit comes on and in the case of
range underflow, the lower arrow at the bargraph on the hand unit comes
on.
The corresponding exponent is indicated at the tip to the right of the bar-
graph display.
Two leak rate decades can be indicated by the bargraph display. The
panel for the upper leak rate decade (1…10) is twice as wide as that for
the lower decade (0.1…1).
LOCK LED The LOCK LED comes on when the remote control has been locked.
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