HT instruments HT2234N - Manual (Page 6)

HT2234N
EN - 5
• FUNCTION key
Press ciclycally FUNCTION key to select the Maximum (MAX), Minimum (MIN) and
Average (AVE) values of measured parameters at display, except for events counter
results. MAX, MIN and AVE are shown at display. These functions allow users to analyze
the stability of rotational speed. Average value is calculated as:
∑
=
n
rpm) (
n
1
RPM
AVE
∑
< 32
2 ) (
n
rpm
;
n<65535
If the sum of average value is overrange, or number of counting values n > 65535, the last
average RPM will be used as initial value for successive calculation and n will be reset to 1.
Pressing HOLD key the MAX/MIN/AVE values are still stored in memory. Press
FUNCTION key to review the values at display.
Press FUNCTION key at least 2s to return to normal mode.
• START/STOP/HOLD key
¾ Press ON/OFF key to turn ON the meter.
¾ Press START key to activate any measures. “ ” symbol is shown at display.
¾ Press START key again to stop measures and hold the data at display. “H” symbol is
shown at display.
¾ Press and hold ON/OFF key at least 2s to turn OFF the meter. “OFF” symbol is shown
for a while.
4.3. AUTOPOWEROFF
FUNCTION
¾ With AutoPowerOFF mode is enabled the clock meter shows Minutes only and the
instruments is automatically OFF after about 30 minutes from last operation. When the
meter is turn ON AutoPowerOFF is always enabled.
¾ To disable AutoPOwerOFF function press and hold UNIT key at least 2s. Internal clock
meter shows Hours and Minutes.
4.4. EMITTING/RECEIVING
UNIT
The HT2234N meter is composed by two internal units which performing all
measurements. The Emitting unit emits a light from a red LED (left side) which is reflected
by reflecting tape applied on the surface of the object on test and is received by Receiving
unit (right side). It is recommenced that the reflecting surface is perpendicular to the
emitting/receiving unit for best measurement.