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adapter supplied by Hart Scientific. The DC power source plugs into the DC
power input on the right side of the 1522.
WARNING: The AC adapter contains high voltage circuits that could
present danger of electric shock or fire if exposed. If the AC adapter is
damaged in any way or becomes hot, discontinue its use immediately, dis-
connect it from any AC supply, and have it replaced. Do not attempt to
open, repair, or continue using a damaged or defective AC adapter.
6.3 Power Button
The power button controls power to the instrument and operates the backlight.
The following table summarizes the power button functions.
Function Action
Power on Press and the power button for at least three seconds
Power off Press the power button momentarily (1/2 second or less) while the power is on
Backlight on Press and hold the power button for three seconds or more while the power is
on and the backlight is off
Backlight off Press and hold the power button for three seconds or more while the backlight
is on
6.4 Display and Backlight
The display shows measurement data and other relevant information depending
on the selected mode.
The upper part of the display continually shows the most recent measurement
with large digit format. A new measurement is produced and displayed every
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6 General Operation
Power Button
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Figure 6 12V DC Power Source Polarity