46 tinb29e1-c (2019-10) VGC083A_B.om
LIN 1 or AOUT LIN 2 or AOUT LIN 3 menu below), then the instrument provides a
10 volt analog output signal when pressure is at 1.00E-03 Torr and the minimum
pressure is automatically set to 1.00E-06 Torr, with a corresponding minimum volt-
age output of 0.01 volts. If your application requires the IG analog output voltage to
cover a pressure range exceeding three decades, then consider using the log-
linear analog outputs. Refer to section 7.6 for details regarding this type of output
signal. This selection is also compatible with a certain analog output scaling from
the Granville-Phillips 307 controller.
Select "ALT LINEAR" only if you have selected ANALOG INPUT in the SET CG2 -
ALT menu intended for use with a CDG device as an alternate gauge to CG2. If
such is the case, this analog output type provides a 0-10 Vdc analog output signal
that has a direct linear relationship to the displayed pressure measured by the
alternate gauge. This selection covers 3 decades of pressure change. Essentially,
this allows retransmission of the same analog input signal being received by the
VGC083. For example, if ALT GAUGE selected is 1000 TORR CDG, the maximum
pressure should also be programmed as 1.00E03 Torr (value programmed for
AOUT LIN 1 or AOUT LIN 2 or AOUT LIN 3 menu below), then the instrument pro-
vides a 10 volt analog output signal when pressure is at 1.00E03 Torr and the
minimum pressure is automatically set to 1.00 Torr, with a corresponding minimum
voltage output of 0.01 volts.
Select "ALT CG 1-8V" only if you have selected ANALOG INPUT in the SET CG2 -
ALT menu intended for use with an INFICON PGE300 or PGE500 convection
vacuum gauge module as an alternate gauge to CG2. Essentially, this allows re-
transmission of the same analog input signal being received from the PGE300 or
PGE500. This selection provides an output voltage that is linear with respect to the
common logarithm of pressure, i.e., log-linear analog output of 1 to 8 volts with a
scaling factor of 1 V/decade of measured pressure. The log-linear output signal
and pressure are related by the following formulas when Pressure Unit of measure-
ment is in Torr and mbar: P=
10(volts – 5)
where P is the pressure in Torr or mbar, and
V is the output signal in volts.
Select "ALT IG LOGN10" only if you have selected ANALOG INPUT in the SET
CG2 - ALT menu intended for use with an INFICON BAG302 ionization vacuum
gauge module as an alternate gauge to CG2. Essentially, this allows retransmis-
sion of the same analog input signal being received from the BAG302. This selec-
tion provides an output voltage that is linear with respect to the common logarithm
of pressure, i.e., log-linear analog output of 0 to 9 volts with a scaling factor of 1
V/decade of measured pressure. The log-linear output signal and pressure are
related by the following formulas when Pressure Unit of measurement is in Torr
and mbar: P= 10
(volts – 10)
where P is the pressure in Torr or mbar, and V is the
output signal in volts.
Select "CG1 1 - 8V" as the analog output type to set the analog output voltage
proportional to the pressure measured by convection gauge CG1. This selection
provides an output voltage that is linear with respect to the common logarithm of
pressure, i.e., log-linear analog output of 1 to 8 volts with a scaling factor of
1 V/decade of measured pressure. The log-linear output signal and pressure are
related by the following formulas when Pressure Unit of measurement is in Torr
and mbar: P= 10
(volts – 5)
where P is the pressure in Torr or mbar, and V is the
output signal in volts. Refer to section 7.7 for details regarding this type of output
signal.
Select "CG2 1 - 8V" for CG2. Same as CG1 1 - 8V above, except for CG2.
Select "CG1 0 - 7V" as the analog output type to set the analog output voltage
proportional to the pressure measured by convection gauge CG1. This selection
provides an output voltage that is linear with respect to the common logarithm of
pressure, i.e., log-linear analog output of 0 to 7 volts with a scaling factor of 1 V /
decade of measured pressure. The log-linear output signal and pressure are
related by the following formulas when Pressure Unit of measurement is in Torr
and mbar: P= 10
(volts – 4)
where P is the pressure in Torr or mbar, and V is the out-
put signal in volts. Refer to section 7.8 for details regarding this type of output sig-
nal. This selection is compatible with the analog output scaling from the Granville-
Phillips 307, 350 and 358 controllers.
Select "CG2 0 - 7V" for CG2. Same as CG1 0 - 7V above, except for CG2.^
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