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Re: [softrock40] Current Limited Voltage Test question RXTX 6.3

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  • Alan
    ... From: Jon Subject: [softrock40] Current Limited Voltage Test question RXTX 6.3 ... Jon, No, this is just a very crude test to see if there is a short to
    Message 1 of 2 , Oct 28, 2011
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      ----- Original Message -----
      From: "Jon" Subject: [softrock40] Current Limited Voltage Test question RXTX
      6.3


      > Connect a 100 ohm resistor in series with the power line and apply 12 V dc
      > power
      > ...
      > Measure the voltage WRT ground at the +5 V and at the 3.3 Vdc testpoints.
      > A voltage of around 2 V dc indicates the power rails are not shorted
      >
      > Current test is nominal.
      >
      > My rails are measuring 5V=3.29V and 3.3V=3.29V when I have a 100ohm
      > resistor in the supply line. When I remove it the current measurement is
      > nominal and the rail voltages are as follows:
      > 5V 4.97V
      > 3.3V 3.29V
      >
      > Should I be worried about the 5V rail voltage on the current limited test?

      Jon,
      No, this is just a very crude test to see if there is a short to ground,
      voltages are very approximate.
      73 Alan G4ZFQ
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