A standard block is used to give a quick check of the gauge’s ability to measure density and moisture. While in the standard mode the gauge will test the number of density and moisture counts received by the detector tubes. The number of counts are compared to previous standard counts. If the current count is acceptably close to previous counts it will pass. If the count is outside an acceptable range it will fail.

There could be several reasons why a standard count would fail. One could be the amount of time that has elapsed since the last standard count. Remember that the radioactive material in your gauge is always decaying. The amount of decay since the last test might be sufficient enough that your current counts are outside the acceptable range for a passing comparison. If you are concerned that the time interval could be the problem you can re-check the gauge by performing four new and separate counts. This will wipe out the old tests stored in the gauge or the tests that were manually recorded. Average the new counts, take a new standard count and compare it to the average of the new counts. You should find that the new test is now within an acceptable range of 1% density and 2% moisture. Check the gauge manual for proper standard count procedures.

If the counts are still not acceptable contact the manufacturer or your service provider for instructions.

Standard counts are also used to adjust for the decay that has occurred to the radioactive sources. Standard counts are very important and should be taken and recorded every day the gauge is used.