MAINTENANCE
Section 17, Page 7 May 2002
The "y" value is a decimal representation of the most recent voltage conversion,
taking into account all appropriate gains and attenuators. The "z" value represents the
actual ADC count. The analog card must be turned ON to receive values on this line.
To have the ADC take a reading, press
Enter
.
Note: The REFERENCE voltage should be 4.5 volts.
Calibrate Diagnostic Fields
The Calibrate diagnostics function in a manner similar to the Analog diagnostics. They are
found in the lower left part of the screen in Figure 17.2.
Cal Pow OFF
Turns the calibrator power supply OFF or ON.
DAC 0
The calibrator DAC count. Count levels range from -32768 to 32767. Set either the
DAC or the next setting for Output Voltage.
.000 V
Output Voltage. Voltage levels range from -8.35 to 8.35. This voltage is then
available to the multiplexer. Set either the Output Voltage or the previous setting for
DAC. The default voltage is 1.000 V when Cal Pow is turned ON.
Mux Cal
The default calibrator multiplexer setting is to read the Calibrate signal that is the
bipolar switched DAC output. The options are:
• Cal (default - monitor the Calibrate signal – Bipolar switched DAC output)
• DAC (monitor the constant voltage output of the DAC directly)
• Temp (monitor temperature)
• Batt (monitor the 12 volt battery)
Output OHM
The default setup sets the output relay to the OHM (ohmmeter) position. Toggling
the field places the output into the MUX (multiplexer) position for measuring
parameters determined by the Mux selection above.
+ 100 µ
µµ
µa - When OHM is selected, a constant current source is switched into the
CAL output lines that are routed to each analog board. The polarity of this 100 µa
current may be toggled from '+' to '–'. This current source is switched into electrode
pairs to measure contact resistance by the OHM relay on an analog board.
The last line on the screen is reserved for prompts for the soft function (F) keys:
To Next Page
