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Instruction Manual
6 Analog Output
The PCM301 provides a 0 to 8 Vdc, 1 V/decade log-linear signal proportional to pressure.
Pressure (Torr)
0.0001
0.0002
0.0005
0.0010
0.0020
0.0050
0.0100
0.0200
0.0500
0.1000
0.2000
0.5000
1.0000
2.0000
5.0000
10.0000
20.0000
50.0000
100.0000
200.0000
300.0000
400.0000
500.0000
600.0000
700.0000
760.0000
800.0000
900.0000
1000.0000
1,125.0000
The log-linear output signal and pressure in the table above are related by the following formulas:
P = 10
where P is the pressure in Torr, and V is the output signal in volts.
An analog output of less than 0.01 volts to near 0 volt indicates a damaged or faulty sensor.
InstruTech
Analog Output (Vdc)
1.000
1.301
1.699
2.000
2.301
2.699
3.000
3.301
3.699
4.000
4.301
4.699
5.000
5.301
5.699
6.000
6.301
6.699
7.000
7.301
7.477
7.602
7.699
7.778
7.845
7.881
7.903
7.954
8.000
8.051
(V - 5)
V = log
(P) + 5
10
PCM301 Busy Bee
Page 24
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