Ulvac GI-M2, Instruction Manual

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42
9.6.3.LIN output in each status
It outputs a same value voltage of mantissa of pressure display value. The output
voltage has hysteresis by the pressure that increased and the pressure that decreased.
In the linear mode, this cannot be identified if the range differs because the output is
propotional only to the mantissa part.
Pressure display
value (Pa)
Output voltage
(V)
0.80
×
10
－
X
0.80
1.00
×
10
－
X
1.00
2.00
×
10
－ X
2.00
9.99
×
10
－
X
9.99
To identify the digit of pressure, use either the recorder output LOG mode or read the
analog output of the mantissa part in the linear mode and, at the same time, read the
exponent pat of the digital output (BCD output).
In this case, however, the value may not be read correctly at the range changeover
point because the physical change time differs between the recorder output and
digital output (BCD output).
The measured value output voltage is converted to a pressure value as shown below.
Ｐ：
Pressure value (Pa)
Ｖ：
Analog output voltage (V)
Ｓ：
Measured pressure range
Ｐ＝Ｖ×１０
－Ｓ
(Pa)
Fig. 9-1 Analog output graph (Linear)
0
1
2
3
4
5
6
7
8
9
10
1.0E-05 1.0E-04 1.0E-03
O
ut
put
V
ol
ta
ge
(V
)
Pressure (Pa)
Pressure increase
Pressure decrease
1.0E-(N) 1.0E-(N-1) 1.0E-(N-2)