Tachometer Control; Engine Clock; Reset - Horizon Fitness P-1000 Installation Instructions Manual

TACHOMETER CONTROL

Because a bad or failing magneto may affect the RPM displayed on the liquid crystal display (see Theory section), a mechanism is
provided to mask the erroneous RPM information from the display. An Erroneous or erratic RPM display may be accompanied by one or
more of the status LEDs illuminating.
Press-and-release operation of the right and left buttons causes the right and/or left tachometers to be alternately masked and un-
masked from the display. This is a toggle type feature: a masked tachometer will be un-masked, or allowed to affect the display, when
the button is pressed, or an un-masked tachometer will be prevented from affecting the display when the button is pressed.
When the RPM displayed on the P-100 is suspected to be wrong, is jittery or erratic, does not track the engine properly, or one or more of
the status indicators are turned on or are flickering, it is likely that one of the ignition systems has a problem.
The procedure to find the bad ignition system is to isolate the RPM from each internal tachometer can check the results. Mask each
tachometer, one at a time, starting with the tachometer corresponding with any flickering red status LED to try to stabilize the RPM on the
display. A tachometer that appears to be varying wildly or not properly tracking the engine is the culprit and should be masked from the
display to allow normal operation of the P-1000 on the remaining good magneto.
A tachometer that is masked is indicated by the corresponding status LED flashing regularly at a one second rate. Care should be taken
not to interpret this indication as a loss of signal condition. The yellow status indicator is inhibited when either tachometer is masked.

ENGINE CLOCK

Your tachometer may have been pre-programmed at the factory for other than zero engine hours. When ordering your P-1000, a review
of your logs may have been necessary to determine the correct time for the tachometer display. Any correction or change in time must be
recorded in the appropriate log book.
Recording tachometer, such as the P-1000, are considered by the FAA to record engine hours, not airframe hours. Thus, the tachometer
should be ordered with zero hours if being installed with a zero time engine. Allowing the tachometer to run past engine changes in
hopes to accumulate total "Time In Service" is not proper, as the engine operates long before the aircraft leaves the ground, see FAR 1.0.
Also, Horizon Instruments, Inc. provides a service to zero or correct your engine hours when engines are changed, or to adjust a
tachometer display for the proper engine hours reading.

RESET

The computer within the P-1000 may be manually reset if it is suspected that it is not operating properly. To accomplish the reset,
simultaneously press the center and right buttons. The P-1000 should proceed through its self-check tests and resume full operation.
HORIZON INSTRUMENTS, INC. P-1000 INSTALLATION & INSTRUCTION MANUAL P103050 E 12 of 23
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