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E. Setting Near Zero
The display may be set to a specific value near zero. For example, if you know that the system
pressure is 10 mTorr (10 µbar), you can set the display to agree with this value, as follows: while
in
VAC
adjust, press
RAISE
or
LOWER
to set to the desired value. If the system pressure is greater
than approx. 50 mTorr (65 µbar), you cannot make these adjustments.
F. Setting Atmosphere
You should know the local barometric pressure before proceeding; your local airport may have
this information. Normal pressure is approximately 760 Torr (1000 mbar) at sea level.
Press the button labeled
SELECT
until the
ATM
LED
is flashing. You may now use
RAISE
and
LOW
-
ER
to set the pressure to the desired pressure. If you try to set
ATM
pressure when the pressure is
less than approx. 200 torr (350 mbar), you will get a long beep from the loudspeaker. As the dis-
play changes, you will hear a series of ‘chirps’ from the loudspeaker.
G. Reset of Stored Values
This allows recovering the factory settings for
VAC
and
ATM
and resets
SET
POINTS
to minimum:
For a system that is far out of calibration, the factory settings provide a good starting point for re-
calibrating the gauge controller. This procedure also enters
OFF
for the set points. To recover the
factory settings, unplug the 906A for its line voltage power source. Press and hold
RAISE
and
LOWER
buttons at the same time; plug the power cord in. You will hear a few short ‘chirps’ from
the loudspeaker confirming the factory settings have been entered.
H. Changing Units of Measurement
This allows you to change from measurement in Torr to mBar or from mBar to Torr. The internal
software allows the 906A to display pressure in either Torr or mBar. The 906A is shipped with
the unit of measure which was specified at the time of the order. If you wish to change the units
of measure, remove power form the 906A by unplugging it from the AC mains. Press and hold
all three buttons,
SELECT
,
RAISE
and
LOWER
; plug the AC power in and wait for the two “chirps”
from the loudspeaker to confirm the units change. After the display self-test, the display will show
TOR
or
BAR
, to confirm the selected units.
NOTE: Make certain that the labels on the front panel units (torr and mTorr; or µbar and mbar)
match the selected units. If you need a different display overlay, please let us know. This proce-
dure is a bit inconvenient, but it is not intended to be a function that is changed often.
TELEPHONE: 650-969-8811 TOLL-FREE (U.S. only): 800-446-8811 FAX: 650-965-0764 EMAIL: [email protected]
www.duniway.com
