Teledyne Marine Instruments 2002 Manual de usuario descargar pdf (Pagina 15)

149-072011 Model 2002 Vacuum Gauge Page 15 of 38

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

calculate pressure.

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

EXP=INT (2*V)-

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

Pressure (Torr)=Mant x 10

exp

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Teledyne Marine Instruments 2002 Manual de usuario Pagina 15