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4300C User Manual
o Micro-Controller Board (834u-701) –This is the central processing unit of
o Display – This is the visual interface to the user. The display receives its
o Keypad Board (4300C-701) – This section of the ohmmeter contains the
the ohmmeter. The analog to digital conversion, the range selection, LED
indicator selection and all other decision making processes occur in this
portion of the instrument.
• CPU – The micro-controller processes the data received by the ADC's
and sends a ohms reading to the display. Also from the data received
from the keypad, the micro-controller selects the current range,
activates the LEDs and sends data out from the rs-232 port.
• ADC – The micro-controller's analog to digital converters sense the
voltage drop across the load.
• TCM ADC – The micro-controller's analog to digital converter sense
the voltage across the temperature sensor (Omni Compensator).
• Current Range Selector – The current range selection occurs within
the microcontroller. According to the data received from the keypad,
a signal is sent to activate the appropriate relay on the current source
circuitry.
• RS-232 – The RS-232 data is also sent and received by the micro-
controller.
data directly from the micro-controller.
keypad and the LED indicators for the TCM and HLC function.
• Keypad – The keypad is used to send commands to the micro
controller.
• HLC LEDs – These LEDs indicate the result of the HLC comparison.
• TCM LEDs – These LEDs indicate the status of the temperature
compensation mode.
7-4
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