Wahl Heat Spy DHS520, User Manual

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Page 16
User Manual
Wahl DHS520
7.2.2 Continuous temperature measurement
Continuous temperature measurement provides the real-time observed
temperature value. The temperature is updated continuously and the value is
viewed in the instrument eyepiece.
7.2.3 Averaged temperature measurement
Averaged temperature measurement gives a ‘smoothed’ temperature value. To
use the averaging function, press and hold down the trigger. The averaging
function operates for the period during which the trigger is held down. Averaging
stops when the trigger is released.
The response time of the averaging is controlled by the Averager Time
Constant setting in Menu Mode . The options are Slow , Mid and Fast . Use
the and keys to select the required option from the menu.
With a Fast time constant selected, the temperature reading closely matches
the object temperature. Only the most rapid fluctuations in the input are
smoothed in the output. With a
Slow time constant selected, the temperature
reading is much smoother, displaying more of a ‘trend’ value rather than showing
any rapid changes. With a
Mid time constant selected, the temperature reading
is calculated somewhere between the fast and slow time constant values.
‘Slow’ averager
time constant
‘Fast’ averager
time constant
‘Mid’ averager
time constant
b
fluctuating object
temperature reading
a
315019
Fig. 19 Graphical representation of typical Averaged temperature
measurement with Slow , Mid and Fast time constants
a Thermometer trigger pressed
b Averaging is initiated at the instantaneous temperature value. Averaged
temperature values are calculated, displayed and updated