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Calibration Procedure with the Paste Cell
The calibration procedure is identical to the normal procedure without the cell except that, in each case, the
calibration reference is located inside the cell and the entire reference/cell assembly must be placed in the
DTC-300 test chamber instead of just the reference alone. Following is a description of how the calibration
reference are placed inside the cell:
1
Measure and record the thickness of the calibration reference.
2
Select a set of rings whose inner spacer is thinner than the height of the reference.
3
Hold the outer ring with its rim toward the bottom.
4
Insert the bottom metal plate (flange side facing up) in the outer ring and slide the plate all the way down
until the flange comes to rest against the lower rim. Insert and lower the inner ring (spacer) until it reaches
the metal plate.
5
Apply thermal compound
6
Insert the calibration reference in the cell inside the spacer. The top surface of the reference must be
above that of the spacer.
7
Insert the upper metal plate (the one with the small holes along the perimeter) in the cell and push it
down until it makes contact with the calibration reference. If the top surface of the metal plate ends up
below the top of the outer ring, you have chosen the wrong outer ring. The top metal surface must always
be above the outer ring.
8
Hold the cell by the outer ring and apply thermal compound to the exposed top and bottom metal surfaces.
9
Place the cell on the bottom plate of the DTC-300.
Reanalyzing and Modifying a Calibration
Reanalyzing a Calibration
If, during the review of the calibration results, one point on the graph is found questionable, being far from
the linear curve that could be drawn through the other points, several causes may be considered:
•
An erroneous thickness of this particular reference material was entered into the program
•
The reference material in question is chipped, badly scratched or otherwise damaged
•
The reference material was not properly placed in the instrument, for example:
•
The compression on the specimen was not on
•
Too much or too little thermal compound was used, compared with the other samples
•
The guard may not have been lowered for that particular run
•
The wrong spacer was placed in the lower stack of the instrument
If an erroneous thickness of the piece was entered into the program, the calibration file may be modified
and then reanalyzed, to show the corrected results:
NOTE: Although the software allows changes to be made to the temperatures measured during the test,
this is NOT RECOMMENDED. Only the thickness of the sample should be modified, in case it was
wrongly entered into the program.
DTC-300 Getting Started Guide
to both sides of the calibration reference.
Page 45
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