971B UniMag™
25
Operation manual
Analog Output
The 971B transducer provides a voltage output as function of pressure.
The standard output is 0.5 VDC/decade but can also be configured to emulate other analog outputs.
Analog output calibration = 0 (MKS standard 0.5 VDC/decade)
Log
10
(P
Torr
) + 11
P
Torr
= 10
(2×Vout - 11)
P
mbar
= 10
(2×Vout - 11)
P
Pascal
=10
(2×Vout - 9)
V
out
=
V
out
=
V
out
=
2
Log
10
(P
rmbar
) + 11
2
Log
10
(P
Pascal
) + 9
2
The standard MKS analog output always provides 0.5 VDC/decade. If the transducer pressure unit is
changed from Torr to Pascal or mbar the analog output scaling will change as well, so it represents 0.5
VDC/decade Torr or 0.5 VDC/decade mbar or Pascal.
Torr/mbar
Vout
Torr/mbar
Vout
1.0E-8
1.5000 1.0E-5
3.0000
2.0E-8
1.6505 2.0E-5
3.1505
4.0E-8
1.8010 4.0E-5
3.3010
6.0E-8
1.8891 6.0E-5
3.3891
8.0E-8
1.9515 8.0E-5
3.4515
1.0E-7
2.0000 1.0E-4
3.5000
2.0E-7
2.1505 2.0E-4
3.6505
4.0E-7
2.3010 4.0E-4
3.8010
6.0E-7
2.3891 6.0E-4
3.8891
8.0E-7
2.4515 8.0E-4
3.9515
1.0E-6
2.5000 1.0E-3
4.0000
2.0E-6
2.6505 2.0E-3
4.1505
4.0E-6
2.8010 4.0E-3
4.3010
6.0E-6
2.8891 5.0E-3
4.3494
8.0E-6
2.9515 OFF
5.0000