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4.6.4 CALIBRATION
As described in section 4.4 above, two of the most important
steps for the initial setup of the gauge is to set atmosphere (SET
ATM) and set zero (SET VAC) as described below:
SET ATM
Select SET ATM to set atmosphere and the following two sub-
menu choices will appear:
•
SET TO 760
•
ENTER VALUE
1) To set the atmospheric pressure reading (also known as the
"spa" adjustment), flow nitrogen gas or air into your closed
vacuum chamber to allow the pressure to rise to a known
value above 400 Torr. Alternatively, if your local uncorrected
barometric pressure (air) is known, simply vent your vacuum
system chamber to expose the gauge to the local atmos-
pheric pressure.
2) If you are at sea level you may simply select "SET TO 760" if
the units of measure selected is in Torr (SET TO 1.01E+03 if
using mbar or SET TO 1.01E+05 if using Pa). PGE500 re-
sponds with message ATM SET confirming atmosphere has
been successfully set. Press the menu key to return to the
previous menu(s). If you are at an elevation other than sea
level you may select "ENTER VALUE" to enter your actual
known local uncorrected barometric pressure. Minimum
ATM value that can be set is 400 Torr.
SET VAC
Select SET VAC to set zero and the following two submenu
choices will appear:
•
SET TO VAC
•
ENTER VALUE
Summary of Contents for 3PE5-001-B7HZ
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