Cooper Instruments & Systems DFI 1650 Multi-Channel Digital Force Indicator - Manual (Page 62)

CF 66 56 Rev. C 2/05
• “KNOWN POINT 1/5”: point 1 of 5, usually 0% of the transducer’s full-scale capacity.
• “KNOWN POINT 2/5”: point 2 of 5, usually 25% of the transducer’s full-scale capacity.
• “KNOWN POINT 3/5”: point 3 of 5, usually 50% of the transducer’s full-scale capacity.
• “KNOWN POINT 4/5”: point 4 of 5, usually 75% of the transducer’s full-scale capacity.
• “KNOWN POINT 5/5”: point 5 of 5, usually 100% of the transducer’s full-scale capacity.
To insure both correct operation of the transducer and application of the load, the instrument expects the voltage or
current applied at each known-load point to be increasing. For example, the load applied at Known-Load Point 2/2
must cause the transducer to produce a more positive voltage or current than at Known-Load Point 1/2.
These menu items are only available with the Known-Load Calibration types.
12.6.6 CALIBRATE Menu Item
This menu item performs a calibration according to what was entered in the CALIBRATION TYPE and
CALIBRATION DATA menu items.
Before performing a calibration, the transducer must be connected to the instrument, the channel’s Excitation and
Signal Jumpers must be set, the CALIBRATION TYPE must be selected (see “CALIBRATION TYPE Menu Item”,
Section 12.6.4) and the CALIBRATION DATA must be entered “see “CALIBRATION DATA Sub-Menu”, Section
12.6.5).
For maximum accuracy, allow at least twenty minutes of warm-up with the excitation voltage applied to the
transducer before calibration.
If the CALIBRATION TYPE is Shunt Calibration…
• The display will read DOING SHUNT CAL, and prompt you to APPLY 00000 UNIT (where 00000 and UNIT are
previously entered as ZERO SCALE VALUE and DISPLAY.UNITS.) When you have applied this load to the
transducer, press [ENTER].
• The display will then read WORKING and calibration will take place. Upon completion, the display will indicate
DONE and the instrument will return to the RUN mode.
If the CALIBRATION TYPE is 2-Point Known Load Calibration…
• The display will read DOING 2POINT CAL, and prompt you to APPLY 00000 UNIT (where 00000 and UNIT are
previously entered as KNOWN POINT ½ and DISPLAY.UNITS). When you have applied this load to the
transducer, press [ENTER].
• The display will read WORKING, then APPLY 01000 UNIT (where 01000 and UNIT are previously entered as
KNOWN OINT 2/2 and DISPLAY.UNITS). When you have applied this load to the transducer, press [ENTER].
• Upon completion, the display will indicate DONE and the instrument will return to the RUN mode.
If the CALIBRATION TYPE is 3-Point Known Load Calibration…
• The display will read DOING 3POINT CAL, and prompt you to APPLY 00000 UNIT (where 00000 and UNIT are
previously entered as KNOWN POINT 1/3 and DISPLAY.UNITS). When you have applied this load to the
transducer, press [ENTER].
• The display will read WORKING, then APPLY 00500 UNIT (where 00500 and UNIT are previously entered as
KNOWN POINT 2/3 and DISPLAY.UNITS). When you have applied this load to the transducer, press
[ENTER].
• The display will read WORKING, then APPLY 01000 UNIT (where 01000 and UNIT are previously entered as
KNOWN POINT 3/3 and DISPLAY.UNITS(. When you have applied this load to the transducer, press
[ENTER].
• Upon completion, the display will indicate DONE and the instrument will return to the RUN mode.
If the CALIBRATION TYPE is 5-Point Known Load Calibration…
• The display will read DOING 5POINT CAL, and prompt you to APPLY 00000 UNIT (where 00000 and UNIT are
previously entered as KNOWN POINT 1/5 and DISPLAY.UNITS). When you have applied this load to the
transducer, press [ENTER].