Ht-instruments HT77N Manual de usuario descargar pdf (Pagina 8)

HT77N

EN - 7

4.2.2. Wide/50-60Hz/Compare key

Wide/50-60Hz

Shortly pressing the Wide/50-60Hz/Compare key allows enabling the low-pass filter,

which has a cutting frequency of approx. 100Hz. When the function is enabled, the full

scale is forced in manual mode and the display shows “50-60Hz”. Shortly pressing the

Wide/50-60Hz/Compare key again, with enabled function, allows disabling the low-pass

filter and going back to the normal measuring mode.

Compare

Long pressing the Wide/50-60Hz/Compare key (> 1 second) allows enabling the

Compare function. The display shows “Compare” and the set current limit value flashes.

By pressing the Range key it is possible to set the limit comparison current among the

following values: 0.25mA, 0.50mA and 3.5mA. To confirm the set value, press the

Wide/50-60Hz/Compare key again. With active Compare function, if the measured current

exceeds the set limit value, the internal buzzer sounds continuously and the current value

shown on the display flashes. Long pressing the Wide/50-60Hz/Compare” (> 1 second)

key again, with enabled function, allows disabling the Compare function and going back to

the normal measuring mode.

4.2.3. Range key

Shortly pressing the Range key allows setting the measuring full scale in manual mode. In

this condition, the display does not show “Autorange”. Pressing the Range key again

allows setting the desired full scale. To restore the Autorange mode, press the Range key

for a time > 2 seconds.

4.2.4. Auto Backlight sensor

The clamp is equipped with a brightness sensor which, in case of low light, automatically

activates the display’s backlight.

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Ht-instruments HT77N Manual de usuario Pagina 8