LEYBOLD 250000V01, Operating Manual

Page: 85 / 112

Operation
GA10218_002_C0 - 10/2016 - © Leybold GmbH 85
helium or hydrogen signal and this signal is referred to the known leak rate of the
internal or external test leak. Although the PHOENIX L300i is a very stable inst-
rument a calibration is recommended every day with heavy use, or before using the
PHOENIX L300i from time to time, to make sure that ambient temperature changes
or dirt or other impacts don’t adulterate the measurements.
To get an optimized calibration the machine has to warm up at least 20 minutes
before use, otherwise a warning will come up which might be ignored.
3.13.2 The calibration Routines
The calibration routines can be started by pressing button CAL (Softkey 5) via 3
different locations:
main menu ( Fig. 23 )
standby mode ( Fig. 12 )
measurement mode ( Fig. 10 )
The access via standby mode or measurement mode can possibly be blocked (see
Chapter
3.12.2 ). In this case the softkey is not labeled. Default: Access on.
Once the calibration mode is activated the user must choose between an internal
and an external calibration. Please press the corresponding Soft Key (
Fig. 29 ).
A calibration may be terminated at any time by pressing the Stop button or using
the Soft Key no. 1 (Cancel)
Fig. 34 .
3.13.3 Internal Calibration
Mass 4 must be selected (Default setting)
Press Softkey no 4 Fig. 29 to start the calibration. Once this procedure is started
the entire procedure is performed automatically. At the end (after about 25 s) a
visual and audio signal is released. Thereafter the unit is ready for further use.