Chapter 4 Operational Verification Tests
Backlight Test
Press the LIGHT key; the display’s backlight
will turn on for about five seconds. This
function is meant to be used in total darkness;
the backlight may not be visible in daylight or
normal room lighting.
Sleep Mode Test
Press and hold the RATE key, then press the
ON/OFF key.
• The characters SLP will be displayed
briefly.
• When you see – – – , release both keys.
• You’ll see the SLEEP indicator at the
top of the screen (Figure 4)
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