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SC 2000, SC2001, SC3004
1.4 What is Signature Calibration?
1.4.1 Overview
A small integrated circuit is located either inside the transducer,
in an in-line package between the instrument and the transducer,
or in the connector of a cable. All data necessary to set up the
transducer with the instrument are stored (even linearity data),
and setup is automatic when a new transducer is connected to
the instrument.
The Strain-Gage Input channel of the SC Series is designed to
operate with Signature Calibration. It will automatically set itself
up with transducers which contain the memory device, but can
also be set up using a front-panel interactive procedure. The
Signature Calibration module can also be programmed from the
instrument's front panel.
Signature Calibration is only available with unamplified strain-
gage transducers.
1.4.2 Benefits
•
The transducer's Calibration Record is always located where
it is needed most... with the transducer.
•
The instrument is always set up correctly with the transducer.
•
Interchanging of transducers and instruments is a quick
process.
•
A User Calibration Data area that can be altered by custom-
ers to fit their requirements.
•
A Factory Calibration Sheet Data area, unalterable by the
customer, can be copied back into the User Calibration
Data.
1.4.3. Information Stored
The following information is stored inside transducers equipped
with Signature Calibration:
•
Full-scale mV/V: The full-scale millivolt-per-volt (mV/V) rating
of the transducer when its full load is applied; also called
"calibration factor".
•
Shunt-Cal mV/V: The millivolt-per-volt output of the transduc-
er when the shunt calibration resistor is placed across its (-)
SIGNAL and (-)EXCITATION leads.
•
Shunt Resistance: The resistance value, in Ohms, that was
used to obtain the shunt-cal mV/V value above.
•
Full-Scale Value: The full scale value of the transducer, in
engineering units.
•
Engineering Units: The engineering units that the transducer
is calibrated in (i.e. pounds, grams, pascals, inches of water,
etc.).
•
Serial Number: The serial number of the transducer.
•
Excitation Voltage: The magnitude and type of signal used to
excite the transducer.
NOTE: The excitation voltage of the instrument is set to 5 Vdc
regardless of the value stored within the Signature Module.
•
Linearization Points (optional): These can be used by an
instrument using Shunt Calibration or Millivolt-per-Volt Cali-
bration to correct any non-linearity in the transducer and thus
improve the accuracy of the system. An additional "multiple-
point calibration" can be purchased with the transducer that
allows linearity correction information to be placed into its
Signature Calibration module.
008-0608-00
Rev. G,
Honeywell Sensing and Control
3
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