Inficon PGE500, Руководство по эксплуатации

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tinb21e1 (2016-06)
47
Log-Linear Output
Many INFICON modules and controllers also provide a log-linear
output signal, as an alternative to the non-linear signal described
below. This output, shown above, is a 1 Volt per decade signal
that may be easier to use for data logging or control.
The table shown in section 7.3, 7.4 and 7.5 contain the lookup
data and provides the formulas for converting the
log-linear
output voltage into pressure values for nitrogen and various
other gases.
Linear 0-10 V (dc) Analog Output
The PGE500 also provides a linear 0-10 V (dc) analog output.
The linear output voltage can be any value between 10 mV and
10 V corresponding to displayed pressure between 1 mTorr and
1000 Torr. However, the useful range of the linear analog output
is three decades. For example if the minimum pressure selected
is 1 mTorr (1.00×10
-3
Torr) with a corresponding minimum volt-
age output of 0.01 volts, then maximum pressure selected to
correspond to a maximum voltage output of 10 volts should not
exceed 1.0 Torr. If your application requires the analog output to
cover a pressure range exceeding three decades then consider
10
+3
10
-3
10
-2
10
-1
10
0
10
+1
10
+2
2
3
4
5
6
7
8
Pressure - Torr
Output - Volts
Log-Linear Analog Output
1
10
+3
10
-3
10
-2
10
-1
10
0
10
+1
10
+2
2
3
4
5
6
7
8
Pressure - Torr
Output - Volts
Log-Linear Analog Output
1