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RPM ARC INDICATORS
Three large LED type indicators are provided at the upper right corner of the P-1000 face to indicate the RPM operating range of the
engine (See Figure 1). A "Normal Operating " green, "Caution" yellow, and "RED-LINE" red LED are provided. The RPM settings at
which these indicators activate are presettable at the factory. Five separate RPM arcs can be factory programmed into the P-1000.
MAG-DROP DISPLAY MODE
Loss of either magneto signal causes the P-1000 to turn the appropriate status indicator, remember the engine RPM at the time the signal
was lost, and display the drop in engine RPM that resulted from the loss of the magneto. When this feature is used in conjunction with the
ignition switch, pre-flight magneto performance tests, or "Mag-Drop", can be easily and accurately performed. During this mode of
operation, the LCD should show a small RPM number, normally preceded by a minus sign ("-") indicating that the engine slowed down.
A display without a minus sign indicates an engine that has increased in speed. If the loss of signal remains for more than fifteen
seconds, the P-100 will revert back to displaying the engine RPM, determined from the remaining functioning magneto.
OPERATION
Three buttons on the face of the P-1000 control the information being displayed to the pilot. These buttons have two modes of operation:
press-and-hold, and press-and-release. The press-and-hold operation is used to control information displayed on the liquid crystal
display. Each button must be pressed and held for one second to change the display. Pressing and holding the right button causes the
Overspeed trap to be displayed. This function is denoted on the P-1000 face by the word "TRAP" above the button. Pressing and
holding the center button for one second will cause a zero to be displayed. This causes the Overspeed trap to be cleared, and the button
is marked with eh word "CLEAR". Pressing and holding the left button for one second will cause the engine hours to be displayed. While
the button is being held, the integer portion of the engine hours is displayed. Upon release of the button, the fractional portion of the
engine hours is displayed for five seconds, then the display reverts back to displaying RPM. This function is marked on the P-1000 by the
word "HOURS" above the left button. Press-and-release operations modify the operation of the internal tachometers and control display
characteristics. The press-and-release operation must occur within one second to distinguish the operation from the press-and-hold
operations described above.
LED DIMMING
A press-and-release operation on the center button causes the LED indicators (except for the red LEDs) to be dimmed. Pressing the button
again restores the LEDs to full intensity. This feature is handy for night flying because an LED bright enough to overcome sunlight
washout may be annoyingly bright at night. This function is marked "DIM" on the P-1000 face under the center button. The red RPM
range indicator is not dimmable.
HORIZON INSTRUMENTS, INC.
P-1000 INSTALLATION & INSTRUCTION MANUAL
P103050
E
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