PeakTech 2680 A, Руководство по эксплуатации

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6.5 Clearing the memory
You can use the Log clearing function to delete all measured values
that have been saved. To do this, select the submenu item 4. After
the sub-item has been selected by pressing the Enter key. After
pressing the Enter key, the display shows whether you really want
to delete all stored measured values. You can confirm this by
pressing the Enter key again and all saved values will be deleted.
6.6 Display backlight
With the Esc / Backlight key, it is possible to switch the display
lighting on and off. To do this, press the button for approx. 2
seconds and the display will light up. To switch off the backlight,
press the button again for approx. 2 seconds.
6.7 Automatic switch - off
The insulation measuring device has an automatic switch-off. This
turns off the device after approx. 3 minutes without using the
measuring device or taking a measurement.