HT instruments HT3310 - Manual (Page 9)

HT3301-HT3310
EN - 8
5. PARAMETERS SETTINGS
5.1. EMISSIVITY ADJUSTMENT
5.1.1. Definition
Emissivity is a term used to describe the energy-emitting characteristics of materials.
Most (90% of typical applications) organic materials and painted or oxidized surfaces have
an emissivity of 0.95 (pre-set in the unit). Inaccurate readings will result from measuring
shiny or polished metal surfaces. To compensate, cove the surface to be measured with
masking tape or flat black paint. Allow time for the tape to reach the same temperature as
the material underneath it. Measure the temperature of the tape or painted surface.
5.1.2. Emissivity adjustment (HT3301)
1. Set the EMS mode by press the MODE key (see paragraph 4.4.1)
2. Press and hold the trigger until the “SCAN” message is blinking at the top left part of
display
3. In the same condition of point 2 always with trigger on press and hold the
Laser/Backlight key up to the blink of “EMS” symbol at display
4. Connect the type K probe to the object surface and test the temperature of same point
with IR measurement
5. After both values are stable, press UP or DOWN button for confirmation. Then,
emissivity of the object will be shown at the upper side of the LCD
6. Press MODE button or trigger to enter normal measurement
Note:
• When the IR value is not corresponding to the TK value, or IR and TK tested the
different points, no emissivity will be obtainable or a wrong emissivity will be obtained
• The temperature of the target should be higher than the environment temperature.
Normally, 100°C is suitable for obtaining a higher accuracy emissivity
• After obtaining the emissivity, if the difference between IR value (in the middle of LCD)
and TK value (at the lower side of LCD) is too big, the obtained emissivity will be
incorrect. It’s necessary to obtain a new emissivity
5.1.3. Emissivity adjustment (HT3310)
1. Set the EMS mode through the MODE button (see paragraph 4.4.1)
2. Using UP and DOWN buttons set the desired value
3. Press MODE button or trigger to enter normal measurement.
Note:
• After emeissivity setting, we recommend to compare the IR measurement with a
“standard” measurement trough a K Type probe. The temperature of the target should
be higher than the environment temperature. Normally, 100°C is suitable for obtaining
a higher accuracy emissivity.
• After obtaining the emissivity, if the difference between IR value and TK value is too
big, the obtained emissivity will be incorrect. It’s necessary to set a new emissivity.