5
1.1 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.
RPM Alert:
A warning alert activates whenever the engines redline is reached. The RPM display will
flash until this condition is corrected.
1.2 MANIFOLD PRESSURE OPERATION
The manifold pressure system provides both a full sweep graphic analog display and
three place digital display.
The full sweep graphic display resolution is 1" IN. HG. The full color range marks provide
you with a quick reference to manifold pressure when making fast power changes.
The digital readout provides you with precise manifold pressure information. This allows
very precise power settings to be achieved.
You can, for example, in stabilized conditions, watch for small changes in pressure that
can indicate throttle creep or induction problems.
For new induction system designs, or modifications to existing designs, this repeatability
is extremely valuable to judge the performance of the design or design changes.
Manifold Pressure Alert:
A warning alert activates whenever the engines redline is reached (typically only for
turbocharged engines). The display will flash until this condition is corrected.