Which Bits in the Extended Event Register Corresponds to the “Check Range” LED Indicator on the WT210/WT230?

If you want to know the condition of the "Check Range" LED indicator for voltage and current, you will need to read three bits in the Extended Event Register. "Bit-6", "Bit-7", and "Bit-8" needs to be read to know the status of the "Check Range" indicator on the front panel for Element 1.

There are two possible cases that cause the "Check Range" indicator to illuminate red. The "Check Range" LED will illuminate red if either condition occurs. Keep in mind that the voltage and current ranges are defined in RMS values.

  • Case1:
    The RMS value of the input signal is larger than the range value. Output will display Over Range or --OL--. 
  • Case2:
    The PEAK value of the input signal is larger than 3 times the RMS range value (CF=3) OR the PEAK value of the input signal is larger than 6 times the RMS range value (CF=6). Output will display a measurement value.


Bit-6 of the condition register is defined as the "measured data over" bit. This bit corresponds to Case 1 and will return an ASCII value of "1" if the RMS measured/computed data of the input element exceeds the RMS range value.

Bit-7 of the condition register is defined as the "voltage peak over" bit. This bit corresponds to Case 2 and will return an ASCII value of "1" if the voltage value of the input element exceeds the PEAK value.

Bit-8 of the condition register is defined as the "current peak over" bit. This bit corresponds to Case 2 and will return an ASCII value of "1" if the current value of the input element exceeds the PEAK value.


Note:

  • Bit-9,10, and 11 corresponds to the status of Element 2.
    Bit-12,13, and 14 corresponds to the status of Element 3.
  • Refer to page 14-47 of the WT210/WT230 User's Manual IM760401-01E for a full list of Extended Event Register description.

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