EVB90601 Melexis Inc, EVB90601 Datasheet - Page 7

• Manufacturer Part Number: EVB90601
• Description: EVALUATION BOARD MLX90601 IR MOD
• Manufacturer: Melexis Inc

Specifications of EVB90601

• Rohs Status: RoHS non-compliant

Always save the original EEPROM settings of a module before making any EEPROM changes. To do
this, click on the main menu “File”. Then click “Save as”. Give the file a name and save it on your
computer.
This will allow you to always return the module to its original settings, calibration, and accuracy.
(There is also an internal ID number in EEPROM that cannot be changed. The module serial number is
always displayed in the blue bar of the main menu screen when you are connected.)
Up to 7 IR calibration points are available when re-calibrating. However, for many applications only
one IR calibration point is needed as the EVB software follows established IR curves for high emissivity
objects quite accurately.
Situations where multiple calibration points can be used to increase accuracy are:
To generate the highest level of accuracy for wide temperature ranges. Example: to have the highest
accuracy from To = 0 to 500 C you can use up to 7 points.
When emissivity is less than 0.9, or unknown, or varies with temperature, using more calibration points
can allow you to correct for the variations.
Adding an unusual optical system: lenses, narrow bandpass transmissions, etc. can alter the curve
algorithm used in the software. In this situation, using more calibration points will adapt the curve to the
application.
In general, using more calibration points can allow you to calibrate out errors that can come from a variety
of sources in your intended application.
If you get poor results from your first attempts at re-calibration:
Reload the original EEPROM settings from your test module that you saved on disk back into the module.
Then start the re-calibration tests again.
Always reload the original EEPROM when you wish to re-calibrate the same module.
Additional re-calibration instructions can be found in the “Help” files in the software. Also, the “Help” files
are printed in this manual for your reference.
REFERENCE “BLACKBODY”
To perform a calibration, you can use a reference surface temperature “blackbody”.
There are numerous commercial blackbodies available. Choose a unit that suits your temperature range
and accuracy.
“TEMPERATURE BATH” as a “Blackbody” A standard laboratory temperature bath is a near “ideal
blackbody”. The emissivity of water, and nearly all liquids, is around 0.985. That is as good as many of
the highest quality commercial blackbodies. Here are some simple rules in using a temperature bath for a
blackbody:
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1. It must be a “stirred” temperature bath so that the top layer is constantly being controlled
2. If you wish to measure above approx. 40 C, you should remove the water in the bath and replace
correctly.
it with a non-evaporating fluid. (Reason for this is that evaporating water will condense on the IR
module sensor window. Condensation on the IR sensor window distorts it’s ability to see heat.) A
good working fluid could be automotive antifreeze or equivalent. Such fluids are excellent as they
Page 7
EVB90601 Configuration Board
User Manual
Jan-04