Inficon VGC083A - 7.10 CG1;CG2 LINEAR Analog Output

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When the analog output is setup, as described in section 6.5.6 , for CG1 LINEAR
or CG2 LINEAR, the analog output voltage represents the pressure measured by
the CG1 or CG2 for nitrogen/air only. The Linear analog output type provides a 0-
10 V (dc) output signal that has a direct linear relationship to the displayed pres-
sure measured by the CG1 or CG2 only. This selection covers 3 decades of pres-
sure change. For example, if ANALOG OUT 1 is programmed for CG1 LINEAR
and the maximum pressure for AOUT LIN 1 selected is 1.00 Torr, then the instru-
ments provides a 10 volt analog output signal when pressure as measured by CG1
is at 1.00 Torr. Furthermore, the minimum pressure is automatically set to 1.00E-03
Torr, with a corresponding minimum voltage output of 0.01 volts.
Constructing a table of these parameters may be useful in documenting the re-
lationship of displayed pressure (measured by the IG) to the analog output voltage.
The following table is representative of a typical setup where the CG may be used
in a limited range of pressure measurement where a direct linear relationship exists
between the displayed pressure (mantissa) and the analog output signal.
Linear Analog Output Voltage - volts
Measured (Displayed) Pressure - Torr
0.01
1.00E-03
0.10
1.00E-02
1.00
1.00E-01
10.00
1.00E+00
If your application requires the analog output voltage to cover a pressure range
exceeding three decades, then consider using a log-linear analog output type for
CG1 or CG2.
Note - An analog output of above +11 volts indicates a faulty convection
gauge or unplugged gauge cable.
7.10 Analog Output for CG1
or CG2 LINEAR
(Nitrogen / Air only)