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KJ
MAXMIN HOLD REC
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50S Display 50D Display
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T1 T2 T1-T2
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HOLD
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Figure 3. Display Segments
Wide Range Performance Test Procedure
This test verifies the instrument specifications. If the instrument fails this test, perform the calibration
procedure. If the unit continutes to fail, it should be taken to a Fluke service center.
Ice Bath Construction
To begin the wide range performance test procedure, first construct an ice bath using the following steps:
1. Prepare a Dewar Flask by drilling two holes in its cap to accept the thermometer and thermocouple
wires, or use a standard laboratory cork.
2. Fill the Dewar Flask with shaved or crushed ice made from distilled water.
3. Fill the Dewar Flask with enough distilled water so that the ice turns to slush, but do not add enough
water to float the ice.
Note
As the ice melts, siphon off the excess water and add more ice. Allow approximately 5 to 10
minutes for the water to drop back to the freezing point.
4. Replace the Dewar Flask cap or cork, and insert the thermocouple wires as shown in Figure 4.