Fluke 917X Series Technical Manual page 110

917X Series Metrology Wells
Procedure
102
vi. Allow the unit to stabilize (approximately 30 min).
vii. Take the average difference between the two PRTs (∆T) for 2
minutes.
viii. Store the "New Gradient Value" using serial command
SOUR2:SENS:CAL:PAR1
Where,
New Gradient Value = Previous Gradient Value – (T
ix. Perform this operation three (3) times, 15 minutes apart. Allow 2
minutes soak time at each temperature.
x. Update "New Gradient Value" at each iteration.
xi. ∆T should be within 5 mK by the 3rd iteration
xii. If not, retest and review or abort test
xiii. Repeat Steps v–xii at the second set-point (High temperature set-
point) as indicated in Table 13, Axial gradient as found/as left
specifications, on page 100.
xiv. Store the "New Gradient Value" using the serial command
SOUR2:SENS:CAL:PAR2.
xv. Repeat Steps v–xii at the third set-point (High temperature set-
point) as indicated in Table 13.
xvi. Store the "New Gradient Value" in SOUR2:SENS:CAL:PAR3.
b. Heat source manual axial gradient (vertical uniformity) as left data
i. Ensure that the test sleeve has two ¼" wells. One of the wells
needs to have a 40mm plug in it or needs to be drilled 40mm
shorter than the other well. Ensure the test sleeve is specific to the
model being calibrated.
ii. Place a PRT in each well.
iii. One PRT for the reference temperature PRT goes in the deeper of
the two wells.
iv. One PRT for the differential temperature PRT goes in the shallower
of the two wells giving an axial displacement of 40mm from the
bottom.
v. Set the unit to the first set-point (Low temperature set-point) as
indicated in Table 15.
vi. Allow the unit to stabilize (about 30 min).
vii. Take the average difference between the two PRT (∆T) for 2
minutes.
– T )
40mm Ref