If the analog output voltage is being used in a data acquisition system, the following formulas can be used to calculate pressure.

EXP=INT (*V)-6

MANT=1+18*V-9*(EXP+9)

Pressure (Torr)=Mant x 10exp

Therefore,

Note that the INT function simply returns to the first digit in a number.

Examples:

INT (2.56) = 2

INT (9.87) = 9

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Voltage to pressure conversion example:

Given

V = 2.35 Volt

First calculate the exponent;

EXP = INT (2*2.35) - 6

=INT (4.7 - 6

=INT 4-6

=- 2

Next calculate the mantissa;

MANT = 1 + 18 * V - 9 (EXP +6)

=1 + 18 * (2.35) - 9 * (2+6)

=1 + 42.3 - 36

=7.3

Finally the pressure is given by;

Pressure (torr) = MANT x 10EXP

= 7.3 x 10-2 Torr

Model 2002 Vacuum Gauge

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Image 15
Teledyne 2002 instruction manual Voltage to pressure conversion example

2002 specifications

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