5. MEASUREMENT PROCEDURES
Larger Fruits
A. Select an appropriate plunger tip
for the commodity to be tested.
See “
A GUIDE TO SELECT
THE MODEL
”.
B. Select a random sample of 10 to 15
fruits of uniform size and the same
temperature or 3% of the lot to be
sampled. For best results, suggest
one person should test the lot.
C. Remove a disc of skin on
opposite cheeks of the fruit
midway between the stem and
bottom on sun and shade sides.
Then proceed with puncture test.
D. Zero adjustment
Hold the FHT vertically with the
plunger tip hanging in the air, the
reading on the display should be 0.
If not, depress the 'ZERO' key to
make the FHT tester display '0'.
E. Hold the fruit against a hard
s u r f a c e a n d f o r c e t h e t i p
vertically into the pulp at a
uniform speed (take about 3
seconds).
F. The tip should consistently
penetrate to the break in tip
diameter or to the scribed line on
some tips.
G. Record reading on the display.
H. If a maximum reading is needed,
just press the key 'MAX' till the
mark 'Max' shows on the display
before taking measurements.
The appearance of mark 'Max' is
controlled by the key 'MAX'.
I. To take the next measurement, just
depress the 'ZERO' key and repeat
steps from E to G.
J. Unit conversion is controlled by
depressing the key 'UNIT'.
K. For the model FHT-803, make sure
the plunger tip is in accordance
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