Cooper Instruments & Systems DFI 1650 Multi-Channel Digital Force Indicator - Manual (Page 11)

CF 66 5 Rev. C 2/05
• Value type: The next character indicates the nature of the following value. A blank character indicates the
tracking value. The instrument is “tracking” the signal, continuously updating the display in response to the
signal from the transducer.
• A ”▲“ character indicates the peak value (highest value seen since the [CLEAR] button was last pressed).
• A “▼“ character indicates the valley value (lowest value seen since the [CLEAR] button was last pressed).
• Data value: “00000.” Displays the value from the transducer in engineering units.
• Units label: “PSIG” indicates the engineering units being used (up to 4 characters).
• Tare indicator: A “◊“ symbol indicates tare is off; a “ “ symbol indicates tare is on.
2.4 Use the SETUP Menus to Enter Transducer Information
You can skip this step if:
• You are using a transducer equipped with Signature Calibration, or
• The transducer and instrument were purchased together and set up by Cooper.
Otherwise, you must enter information about your transducer into the SETUP menu of the channel to which it is
connected. See the appropriate chapter of this manual for that card type.
2.5 Calibrate the Transducers to Their Channels
You can skip this step if:
• You are using a transducer equipped with Signature Calibration, or
• The transducer and instrument were purchased together and set up by Cooper.
Otherwise, you must choose a calibration method (e.g. Shunt Calibration, mV/V Calibration, or Known Load
Calibration) appropriate for your application and use the SETUP menu for that channel to calibrate the channel to
the transducer. See the appropriate chapter of this manual for that card type.
2.6 The DFI Instrument is Ready for Use
See “RUN Mode”, Section 3.3, for information on how to operate the instrument while it is in the RUN mode.
Apply some test stimulus on the transducer to observe changes in the display.
3.0 OPERATING MODES
3.1 Operating Modes
The DFI instruments have four modes of operation:
• INTIALIZE, to test the instrument upon power up
• RUN, normal operation
• ERROR, which indicates that an abnormal situation has occurred that stopped the operation of the
instrument
• SETUP, a menu that allows setup and calibration of the chassis and its channels.
Each of these will be described in this chapter.
3.2 INITIALIZE Mode
When the instrument is powered up or otherwise rest, it enters the INITIALIZE mode. As the instrument enters this
mode, all segments of the display and all front panel indicator lights (if available) illuminate momentarily. Next,
each channel in the instrument is checked for proper operation.
If a problem is detected, the instrument may enter the ERROR mode.
Depending on the type of channel, other actions may occur. For example, a Strain-Gage channel will calibrate its
analog-to-digital converter and attempt to read the transducer’s Signature Calibration information. If the transducer
is equipped with Signature Calibration, the transducer’s serial number is displayed momentarily.