Cooper Instruments & Systems DFI 1650 Multi-Channel Digital Force Indicator - Manual (Page 64)

CF 66 58 Rev. C 2/05
12.6.8 DIAGNOSTICS Sub-Menu
DAC FULL SCALE Menu Item
When this menu item is selected, the Analog Output of the channel is forced to its full-scale output, then DAC
UPDATED is displayed. This is useful when calibrating or trimming the readout connected to the Analog Output.
DAC ZERO SCALE Menu Item
When this menu item is selected, the Analog Output of the channel is forced to its zero-scale output, then DAC
UPDATED is displayed. This is useful when calibrating or trimming the readout connected to the Analog Output.
VERSION INFO Menu Item
This menu item displays the part number and revision level of the firmware used by this channels microprocessor.
DISPLAY ADC Menu Item
The options for this menu item are:
• “OFF” will allow the [VALUE] button to cycle through “TK” (tracking value), “HI” (peak value) and “LO” (valley
value). This is the recommended option.
• “ON” will allow the “AD” (percentage of the Analog-to-Digital converter’s full-scale digitizing capability (display
source to be available along with “TK” (tracking value), “HI” (peak value) and “LO” (valley value) when the
[VALUE] button is pressed on the front panel.
The Analog-to-Digital converter counts are displayed as a percentage from –100.00% to 100.00%.
This can be used to verify that the transducer’s output does not exceed the input range of the instrument. If the
Analog-to-Digital converter readings display more than +/-10% when there is no load on the transducer, the
transducer has a high zero offset.
LINEARIZATION Menu Item
The options for this menu item are:
“ON” will allow linearization data obtained from either the Signature Module or a 3-Point or 5-Point Known Load
Calibration to affect a channel’s scaled values. This is the recommended option.
“OFF” will not allow linearization data to effect the channel’s scaled values. This is useful when diagnosing
problems in a calibration procedure.
DISABLE CHANNEL Menu Item
The options for this menu item are:
• “ON” will bypass the INITITIALIZE and RUN modes of the channel. The track, peak and valley values of the
channel are forced to 0. This option is helpful when a channel is installed but not being used. ERROR 46,
which will normally occur when the (+)Sense and (-)Sense wires are not connected properly, will be
suppressed.
• “OFF” will allow normal operation of the channel.
12.7 Analog Output Configuration
12.7.1 Identifying the Output Type
A High-Level Input channel is available with one of two types of digital-to-analog (DAC) outputs: voltage or current.
You can determine which type of output a channel has by one of three ways.
• Consulting the instrument’s System Calibration Sheet
• Examining the SYSTEM MENU->CONFIGURATION->CHANNEL nn TYPE menu item where nn is the number
of the channel. If the channel’s type is HIGH-LEVEL V, it has a voltage output. If the channel’s type is HIGH-
LEVEL I, it has a current output.
• Examining the channel’s circuit board as shown in the figure below.
12.7.2 Channel Menu Items
The Analog Output can be driven by any channel’s track, peak or valley value.
See the “Channel Menu” section earlier in this chapter for a complete listing of SETUP menu items available on the
DAC.SETUP sub-menu.