Testboy TV 325, Operating Instructions Manual

Page: 37 / 228

Functions
Testboy
®
TV 325 37
ENGLISH
Lock function (continuous measurement)
The Testboy
®
TV 325 can be turned to continuous measurement using the
lock function. To activate continuous measurement, press the "Up" key
(arrow pointing upwards) on the operating panel with the device switched on.
You can see that the lock function is active as "Lock" is shown in the display.
To disable continuous measurement, press the "Up" key again.
You can switch the laser and the background illumination on and off during
continuous measurement.
Targeting laser
When the laser is turned on, the laser point shows you the approximate
middle of the measuring surface. This makes more exact measurements
possible. When the instrument is turned on, you can activate the laser by
pressing the "measure key" and the "down key". Hold until the laser symbol
appears in the LCD display. Now when you press the temperature
measurement key, the laser beam will point at the middle of the surface to
be measured. In addition, the LED spotlight provides additional illumination
for poorly lit measurement objects. Press the "measure key" and the "down
key" again until the laser symbol disappears. This will turn off the laser.
Size of measuring surface - distant-to-spot ratios (D/S)
In order to get accurate measuring results, the object to be measured must
be larger than the measuring surface of the infrared thermometer. The
detected temperature is then the average temperature of the measured
surface area. The smaller the object is the shorter the distance to the
infrared thermometer should be. The exact size of the measurement area
can be seen in the following diagram. This is also printed on the outside of
the instrument.
For exact measurements, the object to be measured should be at
least twice the size of the measured surface area!