Maintenance
Performance Tests
3
3-13
4. Insert the 80T-150U into the DMM and select a DC mV range with 100 µV
resolution. Turn on the 80T-150U to °C or °F to match the lag bath thermometer.
5. Immerse the probe of the 80T-150U into the lag bath to the same depth as the
thermometer and allow the system to stabilize.
6. Note the difference in temperature readings between the 80T-150U/DMM and the
lag bath thermometer.
If the 80T-150U/DMM reads higher than the thermometer, subtract the difference
from the 80T-150U/DMM reading in step 8.
If the 80T-150U/DMM reads lower, add the difference to the 80T-150U/DMM
reading in step 8.
7. Remove the 80T-150U probe from the lag bath and insert it down into the COM
input terminal on the Fluke 78, making contact at the bottom.
8. Select the temperature function on the Fluke 78, °C or °F to match the 80T-150U.
Allow the readings to settle.
The flashing reading of the Fluke 78 should be within 3 °C or 5.5 °F of the 80T-
150/DMM reading after taking into account the reading difference noted in step 6.
°
C
OFF
80T-150U
TEMPERATURE PROBE
°
F
DMM
80T-150U
LAG BATH
(ROOM TEMPERATURE
WATER)
THERMOMETER
IMMERSED TO
APPROXIMATELY
SAME DEPTH
mV
zr07f.eps
Figure 3-3. Ambient Temperature Lag Bath
To Next Page
Loading...
