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Instruction Manual
LOG 0-7; Log-Linear Analog Output
The LOG 0-7 setting selected from the ANALOG TYPE menu
produces a log-linear analog output signal of 0 to 7 Vdc for
1.0E-4 to 1000 Torr of N
. This output, shown at right, is a 1
2
Volt per decade signal that may be easier to use for data
logging/control than the non-linear output.
Selecting the LOG 0-7 setting from the InstruTech VGC301
ANALOG TYPE menu duplicates the analog outputs of the
Granville-Phillips Convectron® gauge controller series 375
and 475.
The LOG 0-7 option was not previously available for the
VGC301 product manufactured with firmware XXXXX-10 or
lower (last 2 digits of 10 or lower, see firmware number in
the INFO screen of the display menu).
The equations and tables shown in
7.4
contain the lookup data for converting the
LOG 0-7 output voltage into pressure values for nitrogen
and various other gases.
NONLIN 6V; Non-Linear Analog Output, S-Curve
The NONLIN 6V setting selected from the ANALOG TYPE
menu produces a non-linear analog output signal of 0.375 to
5.659 Vdc for 0 to 1000 Torr of N
an "S" curve, as shown at right.
Selecting the NONLIN 6V setting from the InstruTech
VGC301 ANALOG TYPE menu duplicates the Granville-
Phillips Mini-Convectron® modules original S-curve of 0.375
to 5.659 Vdc corresponding to 0 to 1000 Torr.
If you also have a previous version(s) of the VGC301 product
manufactured with firmware XXXXX-10 or lower (last 2 digits
of 10 or lower, see firmware number in the INFO screen of
the display menu), the "NONLIN 6V" menu selection in the
current firmware corresponds to the "NONLIN" menu
selection of the older firmware.
The equations shown in
section 7.5
section 7.6
and
section 7.7
converting the NONLIN 6V output voltage into pressure
values for nitrogen and various other gases.
InstruTech, Inc.
section 7.3
and
section
, roughly in the shape of
2
and tables shown in
contain the lookup data for
VGC301 Controller
Page 20
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