IET Labs DE-5000, Руководство пользователя и обслуживания

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2.7.2. Using the backlight
To use the back light, press key. To turn it off, press
the key again.
Note that the backlight is disabled automatically after the
meter is inactive for 60 seconds.
2.7.3. Holding a reading on the display
Normally, the reading of any given DUT disappears as
soon as the device is disconnected from the test points.
To hold the reading, press the
HOLD
button.
Note : while in the Hold mode, only the will
operate.
To exit this mode, press the HOLD button again.