GHM GREISINGER G 1111, Руководство по эксплуатации

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6 | Measurement Basics G 1111
16 / 28 B-H88.0.11.DB2-1.0
6 Measurement Basics
6.1 General information about absolute pressure
measurement
The device measures absolute pressure. However, this should not be confused with
the "sea level air pressure" indicated by weather stations. The altitude-based air pres-
sure decrease is calculated for these pressure specifications. The device is capable of
correcting this air pressure altitude correction.
Prerequisites
– In the
Configuration
menu, the parameter value
SEA
.
L
must be set to
YES
.
– In the
Configuration
menu, the actual altitude above nautical norm must be
entered in the parameter value
ALT
.
The nautical norm correction must be deactivated for vacuum measurements.
6.2 Vacuum measurements
The device is especially suitable to measure rough vacuum via the pressure port very
fast. But if the complete device is evacuated the following has to be considered:
CAUTION
Damage possible by fast complete evacuation!
Due to the water tight construction a complete evacuation of the device may degrade
water protection. The keypad/display screen may break loose. If the device should still
be used for this application, the following options are available:
– Remove the o-ring of the battery compartment! The Instrument then is no more
water protected! Changing battery [ } p. 20] .
– Specialized variants G 1111-VAC!
6.3 Special functions
_
With the special functions that can be selected via the
Configuration menu
, the device
can be optimised for special measuring tasks. After it is switched on, the device starts
up in standard measuring mode, the relevant special function is started by pressing
and holding the
Function key
for 4 s.
6.3.1
NVLL
Tare function
_
Prerequisite
The special function
FVNC NVLL
has been selected in the configuration menu.
The display can be zeroed by pressing the
Function key
for 4 s. If the tare function is
activated,
NVLL
blinks in the lower display. The tare function can be reset by pressing
the
Function key
again for 4 s.
NOTE
The tare function is independent of the zero point correction accessible via the set-
tings menu.