1. From the transducer calibration data sheet, obtain the following values:
- Shunt-cal output (or “shunt-cal factor”) in mV/V
- Calibration factor (or “full-scale output”) in mV/V
- Full-scale engineering units (or “capacity”) in psig, lbs, etc.
2.
Coarse span
-This control alters the gain of the amplifier or readjusts the span when calibrating to a different
transducer. Determine the unscaled shunt-cal display value using the following formula:
Shunt-cal output x 19999 = unscaled shunt-cal display
Calibration factor
With no load on the transducer, press and hold the
shunt cal
button.
Use a small screwdriver to adjust the
fine span
potentiometer until the display reads the exact unscaled shunt-
cal display value from step 2.
3.
Fine span
-With no load on the transducer. Press and hold the shunt cal button. Use a small screwdriver to
adjust the fine span potentiometer on the front panel until the display reads the exact unscaled shunt-cal
display from step 2.
4.
Scaling
-This control scales the display to the desired units. Determine the scaled shunt-cal value using the
following formula:
Shunt-cal output x full-scale units = scaled shunt-cal engineering units
Calibration
factor
With no load on the transducer, press and hold the
shunt cal
button. Use a small screwdriver to adjust the
scaling
potentiometer until the display reads the scaled shunt-cal engineering units.
After scaling, return the panel to the case and tighten the four captive fasteners. If the display does not read 0000,
fine tune the unit again according to the procedure on page 5.
Shunt Calibration Example
:
The following values are taken from a typical transducer calibration data sheet:
•
shunt-cal output = 1.4683 mV/V
•
calibration factor = 2.9999 mV/V
•
full-scale units = 25 psig
To calculate the unscaled shunt-cal display value:
unscaled shunt-cal display= shunt-cal output x 19999 = 1.4683 mv/v x 19999 = 9788
calibration factor
2.9999 mv/v
To calculate the scaled shunt-cal value:
Scaled shunt-cal value = shunt-cal output x full-scale units = 1.4683 mv/v x 25 psig = 12.236
calibration factor 2.9999 mv/v
4.0 OPTIONS
The DFI 9000 has three options:
•
Peak detector
•
Analog voltage output
•
High input
See below for brief descriptions of the DFI 9000 options. For more information about the options, contacts
Cooper’s Sales Department at 1-800-344-3921.
CF12 DFI 9000
6
Rev. C May 2004
