Electronics International R-1-N1 - Manual (Page 6)

The 10 RPM resolution of the R-1 can also help in setting the mixture control for maximum horse-
power for aircraft fitted with either a fixed or variable pitch prop. This is most helpful during high altitude
climbs or take-offs. As your engine is leaned at high altitudes it may exhibit an increase in RPM. This
increase in RPM indicates an increase in power. For a variable pitch prop this will be a small change. It is
not recommended to lean an engine when operated above 75% power. Consult your engine
manufacturer’s operating procedures for proper operation.
If the digital display backlight has been permanently powered up (as recommended), the digital
display will be easier to see during low ambient light conditions and at night.
Mag Drop: Mag Drop: Mag Drop: Mag Drop: Mag Drop:
The mag drop feature allows you to view a change in RPM from a base line. Start by setting the
throttle to achieve normal run-up RPM. Then push both buttons on the R-1. This establishes your base
line RPM and the display will show "000". Any change in RPM (up or down from the base line) will be
displayed. RPM drops will be displayed as negative numbers (i.e.: a "- 200" display means a 200 RPM
drop from the base line). Now switch the mag to "Left" or "Right" and the RPM drop will be displayed.
Switch your mag back to "Both" and the display will return to " 000" or near " 000". Most mags will not
totally recover back to " 000". A problem (fouled plug, bad mag wire, mag problems, etc.) will show up as
excessive drop in one mag and the recover RPM (how close it returns to " 000") will be excessive. The
mag drop feature can be used to check prop governors, horsepower gain or loss during leaning and may
other engine operations.
During mag drop operation the analog display will continue to show proper engine RPM. The Mag
drop operation will automatically be canceled in 60 seconds or it may be canceled at any time by pushing
any button on the R-1.
T TT TTach Time: ach Time: ach Time: ach Time: ach Time:
The tach timer keeps a running total of time the engine is above 1300 RPM. The time is stored in
memory for life. There are no internal batteries and bus power is not required to keep the memory alive.
The maximum reading is 99,999.9 hours.
To display the time on the tach in thousands of hours, press the right push button marked "Tach
Time" and hold the button in. The digital display will show two digits which represent thousands of hours
on the tach.
To display the hundreds, tens, units and 1/10 hours on the tach, release the "Tach Time" To display the hundreds, tens, units and 1/10 hours on the tach, release the "Tach Time" To display the hundreds, tens, units and 1/10 hours on the tach, release the "Tach Time" To display the hundreds, tens, units and 1/10 hours on the tach, release the "Tach Time" To display the hundreds, tens, units and 1/10 hours on the tach, release the "Tach Time"
button for no more than two seconds and press it again and hold it in. button for no more than two seconds and press it again and hold it in. button for no more than two seconds and press it again and hold it in. button for no more than two seconds and press it again and hold it in. button for no more than two seconds and press it again and hold it in. The display will show
four digits with a decimal point. The digits represent hundreds, tens, units and 1/10 hours on the tach.
Each time the "Tach Time" button is pushed and held in the display will toggle between the two displays.
If the "Tach Time" button is released for more than three seconds the digital and analog displays will revert
back to RPM.
4 Rev. A: 6/16/92