2.5
Analog Outputs
2
SETUP
2.5.4
7E/7F/7FC Double Inverted Magnetron Cold Cathode
The 7E/7F/7FC Double Inverted Magnetron cold cathode sensor has two analog output settings. The
Logarithmic Output option provides a logarithmic signal from 1
×
10
−
11
Torr to 1
×
10
−
2
Torr. The
voltage can be converted to a pressure via an equation.
Pr essr e
(
Tor r
) =
10
V
−
11
(6)
The Linear by Decade Output option provides a signal that is linear within each decade (power of
ten) and uses the first digit to convey the decade of pressure. The signal can be converted to a
pressure by using a function to parse the voltage measurement.
For V
=
NT.DDD
Pr essr e
(
Tor r
) =
0
.DDD
×
10
(
NT
−
10
)
(7)
Note that the range of the 7E sensor is limited by the outgassing of the rubber o-ring and does not
possess the same range as the 7F and 7FC sensors. For more information, please see Section 3.1.4,
7E Double Inverted Magnetron Cold Cathode, for more information.
Figure 6: 7E/7F/7FC Analog Output
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