Inficon PGE500, Operating Manual

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then switch to a back-lit background color for the next 12 hours.
If you like to have the 12 hour period for the normal display
mode to start at a specific time of the day, simply access the
SCREEN SAVER menu and change setting to OFF and then ON
again. This initiates the screen saver function immediately.
Note - To increase longevity of the OLED display, INFICON
recommends that the screen saver function remains ON as
shipped from the factory.
AOUT OFFSET
It is recommended that the user not make this adjustment unless
it is critical for your application that when the display of PGE500
reads zero (0.00 mTorr), your data acquisition system (using the
analog output from the PGE500) also registers a pressure read-
ing of exactly zero. Please note that adjusting the AOUT
OFFSET will affect the analog output calibration at atmosphere
(see AOUT CAL menu above). As such, avoid changing the
AOUT OFFSET unless it is critical for display and analog output
to exactly match when the displayed pressure is zero.
To perform this adjustment, pump your system down to below
0.1 mTorr and SET VAC (zero) so that the PGE500 displayed
pressure shows 0.0 mTorr. Connect the PGE500 analog output
to a high resolution voltmeter, your system, PLC, etc. While in
the AOUT OFFSET screen, use the INC or DECR soft-keys to
adjust the analog output to match the corresponding zero
pressure displayed on the screen.
Example 1: The PGE500 ANALOG TYPE menu above is set to
LOG. In the AOUT OFFSET screen, the pressure is displayed at
0.00 mTorr. The expected analog output at 0.00 mTorr is
0.954 V. Use the INC or DECR soft-keys in the AOUT CAL
screen to set the analog output to 0.954 V as recorded by your
voltmeter, PLC, etc. Alternatively, if the analog output is used to
display the pressure in your PLC or system display console,
adjust the AOUT OFFSET so that your PLC also reads
0.0 mTorr.
Example 2: The PGE500 ANALOG TYPE menu above is set to
NONLIN (Non-Linear). In the AOUT OFFSET screen, the pres-
sure is displayed at 0.00 mTorr. Based on the equation and table
given in section 7.1 the expected analog output at 0.00 mTorr is
0.375 V. Use the INC or DECR soft-keys in the AOUT CAL