SV-EMS-220 Engine Monitoring System Installation and Configuration
SkyView HDX System Installation Manual - Revision E 10-9
220. If you supply your own resistors, they need not be exactly 30 kΩ. Additionally, both
1/4W and 1/2W resistors are acceptable to use.
If, after setting the PULS/REV R and L values as described in the Engine
Information Section, you see unstable RPM, you may need to increase the
series resistance. We recommend increasing the resistance in increments of
approximately 30 kΩ – approx. 30 kΩ, approx. 60 kΩ, approx. 90 kΩ, approx.
120 kΩ, and approx. 150 kΩ. Try each value in sequence. A higher resistance
value is not necessarily “better”, as too high a resistance can reduce the
amplitude of the RPM signal to the point where you may see no, or low, RPM.
10.2.9.3 Other Ignition Systems
The SV-EMS-220’s Standard Voltage RPM inputs can read frequency-based RPM
signals, provided the peak voltages goes at least 5.1 volts above ground, and crosses
back down below 2.0V relative to ground. If the peak voltage exceeds 50 volts, use the
included 30 kΩ resistors as described in the P-lead pickoff (Lycoming and Continental)
Section above.
For signals that have a peak voltage of 12V or lower —such as Light Speed ignition
outputs—use the low voltage RPM inputs. These inputs require that the peak voltage
goes at least 2.1 volts above ground, and crosses back down below 0.8V relative to
ground to be counted as a pulse.
For signals that have a peak voltage of 10-12V, either the Standard or Low Voltage RPM
inputs can be used.
Like the other methods above, you must know the number of pulses per revolution for
your RPM transducer.
10.2.10 Manifold Pressure Sensor
The Dynon Avionics Manifold Pressure Sensor (P/N 503387-000) is an integral assembly
consisting of three (3) pins, a rubber seal, and a connector housing. Strip 3/16” (4.7625
mm) of insulation off the ends of the three (3) wires listed at right. Slide the three (3)
rubber seals onto the three (3) wires and the pins onto the ends of the wires. Crimp the 3
included pins onto the ends of the wires, ensuring that the long tabs that cradle the rubber
seal wrap around the seal (see picture at right for example). For more details on preparing
and crimping the Weather Pack pins, see http://www.whiteproducts.net/faqs.shtml.
Table 16: Manifold Pressure Sensor Pins
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