30
Doc. Ref. XGC-320-100119
V100 (2019-11)
c) Set the maximum pressure
d) Set the maximum voltage corresponding to the maximum
pressure
Note -
The LINEAR analog output provides a linear 0-10 V (dc)
output signal. The linear output voltage can be any value be-
tween 10 mV and 10 V corresponding to displayed pressure be-
tween 1 mTorr and 1000 Torr. However, the useful range of the
linear analog output is three decades. If your application requires
the analog output to cover a pressure range exceeding three de-
cades then consider using the non-linear or the log-linear analog
output. See ANALOG TYPE menu above to select Log-linear or
non-linear analog output.
INFO
This screen shows the unit firmware version.
AOUT CAL
This has been pre-set in the factory and is used to optimize the
analog output calibration. It is recommended that the user not
make this adjustment unless the displayed pressure on the
XGC-320 and the resulting pressure calculation from the analog
output do not match closely. To perform this adjustment, connect
the gauge to the XGC-320 and connect the XGC-320 analog
output to a high resolution voltmeter, your system, PLC, etc.
While in the AOUT CAL screen and with the gauge exposed to
atmosphere, use the INC or DECR soft-keys to adjust the analog
output to match the corresponding pressure displayed on the
screen. Example: The XGC-320 ANALOG TYPE is set to
LOG 1-8. In the AOUT CAL screen, the atmospheric pressure is
displayed at 760 Torr. Based on the equation and table given in
section 7.1 the expected analog output at 760 Torr is 7.881 V.
Use the INC or DECR soft-keys in the AOUT CAL screen to set
the analog output to 7.881 V as recorded by your voltmeter,
PLC, etc. Alternatively, if the analog output is used to display the
pressure in your PLC or your system display console, adjust the
AOUT CAL while the gauge is exposed to atmosphere so that
the atmospheric pressure displayed by your PLC matches the
atmospheric pressure displayed by the XGC-320. The AOUT