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Engine hours are recorded in real time beginning when the
engine is assumed to be able to sustain combustion, at or
above 800 RPM. A high accuracy engine clock yields true
TBO times (engines are rated in real hours, not RPM-hours)
and more accurate fuel consumption calculations.
Using the internal microprocessor to compare RPMs from
each internal tachometer against a previously known
highest RPM, and storing the new highest RPM creates the
"Overspeed Trap" feature. Provisions are made to clear
this trap at any time. The Overspeed Trap is saved when
the P-1000 is turned off.
DISPLAY FEATURES
LIQUID CRYSTAL DISPLAY
The P-1000 provides easy to read ½ inch high characters
on a liquid crystal display (LCD).
A "straight line"
(displayed using hyphens) is displayed on the LCD when the
P-1000 is not receiving a signal from either magneto. This
is generally noticeable when the P-1000 is turned on and
the engine is not started.
STATUS INDICATORS
When no signal is received from either the right magneto or left magneto (See Figure 1), the P-1000 will turn on a corresponding right or
left red magneto signal "Status" indictor. The status indicators are located on the upper left of the tachometer face and can indicate a hot
magneto (open circuit) or grounded magneto (breached insulation or broken ignition switch) condition. The indicators turn on after ½
second passes without receiving a pulse from a magneto, and will turn off when the signal is restored.
Another status indicator is located between the red magneto signal indicators. This yellow indicator is a warning that the P-1000 has
detected different RPM from the signals provided by each magneto. This is typical of a failing set of points or an intermittent wiring
problem. The yellow status indicator may be accompanied by a red magneto signal status indicator, but under some conditions, may
appear by itself. See the Troubleshooting section for more information. This indicator operates as a threshold set at the maximum
allowable difference between the mag-drop readings of each magneto.
HORIZON INSTRUMENTS, INC.
P-1000 INSTALLATION & INSTRUCTION MANUAL
P103050
E
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