NDT James Instruments Cementometer L Operating Instructions Manual page 9

Step 4
Add 50 % of the fine aggregate and cement into the drum.
Step 5
Add 60 % of the coarse aggregate and the remaining water
until approximately 1/4 to 1/3 of the water is remaining in the
reservoir being used to contain water.
Step 6
Add the remaining fine aggregate and cement to the drum
followed by the remaining coarse aggregate and water.
Step 7
Let sample mix properly until a proper paste has been
achieved.
Again, this is a 0.20 w/c ratio mix. Remove enough the
fresh concrete from mixer and place in a nonconductive
bucket (1 gallon or more, 4 liters or more) for testing with
the Cementometer™.
Using up or down arrows, scroll through the menu selection
until Direct mode appears on the T-C-20 display. (It is
recommended to erase all prior data saved in the T-C-20).
Take 10 readings for this w/c mixture, store each reading by
pressing enter. Then the readings can be uploaded to the
PC. The readings can be recorded manually with the
corresponding w/c ratio.
Uploading can be done by connecting the instrument to the
P.C. using the supplied USB cable.
Step 8
Once the sample has been put back into the drum, start
rotating drum.
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