Cooper Instruments & Systems DFI 1650 Multi-Channel Digital Force Indicator - Manual (Page 36)

CF 66 30 Rev. C 2/05
This menu item may be automatically updated by a transducer’s Signature Module. It is available for all calibration
types.
FULL SCALE VALUE Menu Item
The transducer’s full-scale output in engineering units.
This menu item may be automatically updated by a transducer’s Signature Module. It is available only with the
Shunt Calibration and mV/V Calibration types.
ZERO SCALE VALUE Menu Item
The transducer’s zero-scale output in engineering units, which is usually zero.
This menu item may be automatically updated by a transducer’s Signature Module. It is available only with the
Shunt Calibration and mV/V Calibration types.
SHUNT CAL VALUE Menu Item
The shunt calibration value must be calculated by using information found on the transducer’s Certificate of
Calibration and the following formula:
SHUNT CAL VALUE = Shunt-Calibration Output/Full-Scale Output x Full-Scale Capacity
The terms have the following meanings:
• Shunt-Calibration Output: The transducer’s output under shunt calibration conditions in mV/V. Sometimes
called “Shunt Cal. Factor”.
• Full-Scale Output: The transducer’s full-scale output in mV/V. Sometimes called “Calibration Factor”.
• Full-Scale Capacity: The transducer’s desired full-scale reading in engineering units (PSI, lbs, Kg, etc.). You
may wish to convert the engineering units of this value. For example, if the transducer full scale is 3000PSIG
and you wish the channel to read in bar, you must convert 3000PSIG into 2.6.84 bar.
This menu item may be automatically updated by a transducer’s Signature Module.
The shunt resistor’s ohmic value used to generate the Shunt-Calibration Output is given on the transducer’s
Certificate of Calibration. Normally, the instrument has a shunt calibration resistor of 59000 (59K) ohms installed.
If your transducer and instrument were purchased at the same time from Cooper, the correct shunt resistor has
been installed.
This menu items is only available with the Shunt Calibration type.
Figure 10-2: Shunt Calibration Resistor Location
To verify proper transducer operation, you can apply the shunt resistor to the transducer while the instrument is in
the RUN mode. Press and hold the [ENTER] button for three seconds; this will apply the shunt resistor and display
the reading.