MKS 651C - How to Request the Pressure Reading; Converting Pressure Readings to Absolute Pressure Values

How To Request the Pressure Reading Cha
p
ter Six: Remote O
p
eration
68
How To Request the Pressure Reading
To request the system pressure, issue the request:
R5
ENTER
The 651 controller responds with the message:
P
value
where
value
is % of Full Scale.
For example, if the pressure is 10 Torr for a 10 Torr F.S. unit, then
value
= 100.
If the pressure is 10 Torr for a 100 Torr F.S. unit, then
value
= 10.
Converting Pressure Readings to Absolute Pressure Values
To convert pressure readings to absolute pressure values:
1. Request the pressure reading by issuing the request:
R5
ENTER
The 651 controller responds with the message:
P
value
where
value
is % of Full Scale.
2. Calculate the absolute pressure using the formula:
Absolute pressure = (
P
value
/100)
X (Full Scale)
For example, if the pressure reading for a 1000 Torr F.S. unit was reported as 65 (65%),
the absolute pressure is:
Absolute pressure = (65/100) X (1000) = 650 Torr