tinb29e1-c (2019-10) VGC083A_B.om 45
Select "IG - CG1 0.5 - 7V" as the analog output type to set the analog output vol-
tage proportional to the pressure measured by the combination of IG plus CG1.
This selection combines the analog output from the IG and CG1 as one signal to
provide a log-linear analog output voltage of 0.5 volts to 7 volts with a scaling factor
of 0.5 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 – 5.5) / (0.5)
where P is the pressure in Torr or mbar, and V is
the output signal in volts. Refer to section 7.1 for details regarding this type of out-
put signal.
Select "IG - CG2 0.5 - 7V" as the analog output type to set the analog output
voltage proportional to the pressure measured by the combination of IG plus CG2.
The analog output characteristics is the same as described for "IG - CG1 0.5 - 7V"
above. Note that your controller may not have this menu as it was added for units
shipped in June 2017 and beyond.
Select "IG - ALT 0.5 - 7V" as the analog output type to set the analog output
voltage proportional to the pressure measured by the combination of IG plus the
Alternate gauge. The analog output characteristics is the same as described for
"IG - CG1 0.5 - 7V" above. Note that the "IG - ALT 0.5 - 7V" selection is mainly
intended for use with an alternate gauge which has a wide measurement range
from atmosphere to the turn-on point for the ion gauge. INFICON convection
gauges such as the PGE300 or PGE500 provide this capability. If you are using a
capacitance diaphragm gauge (CDG) as an alternate gauge you may want to
consider a different output since a single CDG may not provide measurements
from atmosphere to the turn-on point for the ion gauge. Note that your controller
may not have this menu as it was added for units shipped in June 2017 and
beyond.
Select "IG LOG N - 10" as the analog output type to set the analog output voltage
proportional to the pressure measured by the ion gauge only. This selection pro-
vides an output voltage that is linear with respect to the common logarithm of pres-
sure, 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. Refer to section 7.2 for details regarding this type of output signal. This
selection is compatible with the analog output scaling from the Granville-Phillips
307 and 350 controllers.
Select "IG LOG N - 11" as the analog output type to set the analog output voltage
proportional to the pressure measured by the ion gauge only. This selection pro-
vides an output voltage that is linear with respect to the common logarithm of pres-
sure, i.e., log-linear analog output of 0 to 10 volts with a scaling factor of 1 V / de-
cade 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 – 11)
where P is the pressure in Torr or mbar, and V is the output signal in
volts. Refer to section 7.3 for details regarding this type of output signal. This se-
lection is also compatible with a certain analog output scaling from the Granville-
Phillips 307, 350 and 358 controllers.
Select "IG LOG N - 12" as the analog output type to set the analog output voltage
proportional to the pressure measured by the ion gauge only. This selection pro-
vides an output voltage that is linear with respect to the common logarithm of pres-
sure, i.e., log-linear analog output of 0 to 11 volts with a scaling factor of 1 V / de-
cade 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 – 12)
where P is the pressure in Torr or mbar, and V is the output signal in
volts. Refer to section 7.4 for details regarding this type of output signal. This se-
lection is also compatible with a certain analog output scaling from the Granville-
Phillips 307 and 350 controllers.
Select "IG 1.8 - 8.7V" as the analog output type to set the analog output voltage
proportional to the pressure measured by the ion gauge only. This selection pro-
vides an output voltage that is linear with respect to the common logarithm of pres-
sure, i.e., log-linear analog output of 1.8 to 8.7 volts with a scaling factor of 0.8
V/decade of measured pressure. The log-linear output signal and pressure are re-
lated by the following formulas when Pressure Unit of measurement is in Torr
P= 10
((1.25 × volts) – 12.875))
where P is the pressure in Torr and V is the output signal in
volts. Refer to section 7.5 for details regarding this type of output signal.
Select "IG LINEAR" as the analog output type to provide a 0-10 Vdc output signal
that has a direct linear relationship to the displayed pressure measured by the ion
gauge only. This selection covers 3 decades of pressure change. For example, if
the maximum pressure selected is 1.00E-03 Torr (value programmed for AOUT
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