Electronics International R-1-N1 - Manual (Page 5)

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Operating Instructions Operating Instructions Operating Instructions Operating Instructions Operating Instructions
R-1 R-1 R-1 R-1 R-1
Instrument: Instrument: Instrument: Instrument: Instrument:
The R-1 is a precision RPM instrument featuring a 210 degree analog display and a full four-digit
digital display. These two displays have many advantages over conventional analog gauges as described
below.
Also, the R-1 features long-term accuracy and reliability. Since the R-1 does not incorporate any
moving parts (needles, bearings, springs, etc.) there is little to go wrong or wear out. The internal micro-
processor assures accuracy and repeatability.
Analog Display: Analog Display: Analog Display: Analog Display: Analog Display:
The 210 degree analog display provides a quick reference of the engine’s RPM with respect to its
operating range. With a glance you can get a relative idea of how close to the maximum RPM limit the
engine is being operated and approximately how far the RPM has to increase to reach its limit. Precise
information is provided in the digital display.
An advantage of the analog display is its ability to emit a green, yellow or red light. With a quick
glance you can determine if you’re operating in a normal, caution or restricted range. Also, when you
exceed a maximum limit the red light will blink 20 times at full intensity to catch your attention and warn
you that a maximum limit has been violated. After 20 blinks the red light will stop blinking and display
continuous red so it does not distract you. The digital display will continue to display accurate RPM
readings well beyond the red line limit of the analog display.
During night operation the analog lights may be too bright. If so, turn the panel light rheostat up and
the analog lights will dim. The red (maximum limit) light will always be displayed at full intensity.
Digital Display: Digital Display: Digital Display: Digital Display: Digital Display:
The digital display provides RPM information in 10 RPM increments. This allows for precise setting
and monitoring of the engine RPM. Also, the digital display is excellent for monitoring trends or changes
in the engine’s performance.
For aircraft fitted with a fixed pitch prop a relative indication of an engine’s ability to produce power
can be measured by accurately monitoring the engine’s RPM during the first 5 seconds of a full power
take-off. A normal reduction in power will occur from high outside air temperatures, high altitudes and
excessively rich mixtures. Getting to know your engine’s normal take-off RPM can go a long way in
detecting engine problems early.
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Rev. A: 6/16/92