VersaTRAK RTU User M anual
Page 30 of 31
Last Revised: 05/23/02
SIXNET
••••
Box 767
••••
Clifton Park, NY 12065 USA
••••
+1 (518) 877-5173
••••
FAX +1 (518) 877-8346
••••
Calibration
All VersaTRAK, Mini-VersaTRAK and SIXTRAK analog I/O channels are factory calibrated
over all supported ranges using a regularly maintained set of standards. Factory calibration
data is stored in permanent memory in the RTU or logic module, and cannot be altered. User
recalibration may be performed, but is necessary only if inaccuracy in your field device is
observed, or if any of the 100 ohm input shunts are replaced with low tolerance resistors.
Each analog channel has span and offset calibration settings. Span is the "range" or "gain" of
the channel. Offset is the "zero" setting. Each reported analog I/O value is the product of the
factory calibration value times the user calibration value. The user calibration value is defined
as:
(user span value * raw value) + user offset
The user span is a unity value (1) by default. The user offset is zero by default.
Note:
All factory and user calibrations are performed in software. There are no adjustment
potentiometers inside the logic modules.
User calibrations are performed using the SIXNET I/O Tool Kit. Refer to the SIXNET I/O
Tool Kit on-line help system for information on calibrating VersaTRAK analog I/O.
4-20 mA Shunt
Replacement
All VersaTRAK and Mini-VersaTRAK 4-20 mA input channels feature a 100 ohm field
replaceable shunt for each channel. These high precision shunts are located inside the RTU. If
factory supplied shunts are used for replacements, recalibration will not be necessary.
Product
Support
To obtain support for VersaTRAK or Mini-VersaTRAK products, call
SIXNET
and ask for
Applications Engineering.
Our phone numbers are:
+1 (518) 877-5173 Office
+1 (518) 877-8346 Fax
Our mailing address:
SIXNET
Northway 10 Professional Park
P.O. Box 767
331 Ushers Road
Clifton Park, NY 12065
Our E-mail addresses are:
[email protected]
[email protected]
Visit our web page at:
http://www.sixnetio.com
