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Via USB interface the user can set logging rates between 1,0s
and 6000s arbitrarily! The logging rate which was set last this
way is also available for choice in the VD81 display and shown
after "trig".
Without further keystroke the vacuum meter is switched into Auto-Off Mode after
5 seconds. The last settings are saved.
5.2 Adjustment
The instrument is factory adjusted. Through use under different climatic condi-
tions, through extreme temperature changes, ageing or contamination readjust-
ment can become necessary.
To adjust your VD81, switch the unit into Configuration Mode. For this the
instrument must be switched-off. Hold the Mode-Key pressed then, until the
display shows "rAtE".
Then press Mode-Key several times, until the display shows "CAL":
MODE
Adjustment on Atmosphere Pressure
After 5 more seconds the display shows:
5s
Press Mode-Key, the actual atmosphere pressure is displayed:
MODE
MODE
After 5s without further keystroke adjustment is performed:
5s
mbar
Using the Mode-Key you can now adjust the
mbar
reference pressure: very keystroke changes
the displayed value for another 1mbar alter-
nating up- and downwards.
During the adjustment procedure the display
shows "CALI".
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