SECTION 2: OPERATION 19
EPI800 Manual.doc EPI 800 MANUAL 2001 Vision Microsystems Inc.
2.2 TACHOMETER OPERATION
The tachometer system provides both a full sweep graphic analog
display and four place digital display. When you start the engine you
will see the analog graph rise in proportion to the engine speed. Full
color range marks provide you with a quick reference to monitor
normal, caution and red line engine RPM.
RPM:
The digital readout provides you with exact RPM information. The
resolution (or incremental steps) of the digital display is 10 RPM. For
example, the display might read '2400' and after you make a slight
increase in power, it would read '2410'. This is a definite advantage
over other digital tachs that read in less than 10 RPM steps. They
change so frequently that it becomes very distracting and annoying to
the pilot. We recommend using the digital display for RPM checks and
letting the engine stabilize for a minimum of three seconds during the
checks. The high accuracy of the tach will allow you to follow long-term
performance trends of your engine and prop, such as static maximum
rpm, carb heat effectiveness, and typical mag drops. These can be
important indicators of engine and accessory condition.
Engine Operating Hours:
Another feature is the 'engine hours counter'. When the engine is off,
the digital display reads the total accumulated engine hours to a
maximum of '5999.9'. Engine hours are accumulated any time RPM is
greater than 1500.
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