page 106 008-0671-00
12.6.4
CALIBRATION
TYPE
Menu Item
This chooses the type of calibration technique to be used. There are two methods that
can be used to calibrate the transducer to the Input Channel. Each has advantages
and disadvantages as described in the table below.
It is important to know your application
in order to select the appropriate calibration
type. When the best possible accuracy is required, Known-Load Calibration is recom-
mended. However, if known-loads are not available, Shunt Calibration may be used
instead.
The choices for this menu item are:
•
“
TYPE= SHUNT CAL
” means Shunt Calibration. First, you are prompted to apply the
load entered in the “
ZERO SCALE VALUE
” register. Next, the instrument interconnects
the Shunt Cal 1 and Shunt Cal 2 pins. This activates the transducer’s or in-line
amplifier’s shunt calibration circuit which causes a predictable apparent signal.
The instrument then takes a reading and adjusts itself using the “
SHUNT CAL VALUE
”
register.
•
“
TYPE= 2 POINT CAL
” means 2-Point Known Load Calibration. You are prompted to
apply the loads to the transducer that were entered in the “
KNOWN POINT 1/2
” and
“
KNOWN POINT 2/2
” registers. This technique assumes that the transducer is linear,
so the usual loads used are zero scale and full scale.
•
“
TYPE= 3 POINT CAL
” means 3-Point Known Load Calibration. You are prompted to
apply the loads to the transducer that were entered in the “
KNOWN POINT 1/3
” and
“
KNOWN POINT 2/3
” and “
KNOWN POINT 3/3
” registers. This technique can be used to
Table 1-12: Comparison of Calibration Types
Shunt Calibration
2-, 3-, or 5-point
Known Load
Calibration
RECOMMENDED...
...for most applications
no
yes
...when frequently swapping
transducers
yes
no
...when best possible accuracy
required
no
yes
PROS and CONS
Relative accuracy
good
best
Requires actual, calibrated loads
to be applied
no
yes
CALIBRATION TECHNIQUE
Zero-scale point from...
applied load
applied load
Full-scale point from...
transducer output
when Shunt Cal pins
connected
applied load
Linearity correction from...
N/A
2-point: none
3- or 5-point:
applied load
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