"How To" Graph
Your Flight Data Video on
While in-flight with the vibration
screen showing on G3.
Pressing and holding the PG button will
trigger the G3 to save the present vibration waveform
for future reference.
Hold PG button in until G3 screen
says it is data logging vibration data.
To view and graph your G3 logged
vibration data this Excel file will
Click on Excel file and follow instructions.
Insight G3 Vibration Log Graph Tool (V1.14)
- Click Here
Vibration Analysis on the G3
update of the G3 Graphic Engine Monitor to V1.78 or
higher, the Vibration Analysis screen will now appear
among the supplementary screens when the PG knob is
turned. In order for the vibration analysis to function
your G3 must be equipped with a vibration sensor and a
connection to the magneto for RPM measurement. If your instrument was purchased prior to
September 2011, Insight will be sending you a vibration
sensor shortly. Instruments purchased after this date will ship
with the sensor included with the main kit.
Installing the Vibration Sensor:
Airplanes equipped with 24V electrical systems require a
750 ohm 1/2W resistor installed in line with the power
lead of the vibration sensor. This lead may be
identified as the orange/white lead that is connected to
the aircraft voltage buss. Do not install the vibration
sensor in 24V airplane without this critical component.
The sensor is
connected to the G3 using a 7-pin connector included
with your kit. Refer to the G3 Installation Manual,
drawing number 610C-315 Option A for wiring connections.
Do not forget the 750 ohm 1/2W resistor, which is not
shown on earlier copies of the drawing.
electrical connections to the sensor are made, then
sensor may be tested simply by powering up the G3 and
vibration sensor. It is not necessary to start the
engine to perform this test. The sensor LED should flash
briefly and rapidly when power is first applied until
communication is established with the G3, at which time
the LED blinks more slowly (approximately once per
second). When the LED indicates communications with the
G3 has been established select the Vibration Analysis
screen by turning the PG knob. While observing the
vibration graph disregard the “RPM Required” message and
rap lightly on the vibration sensor with the handle of a
The graph should register the impacts.
The sensor should
then be firmly mounted directly to the engine case,
preferably oriented in such a manner as to match the
small airplane symbol engraved on the sensor body. In
some rare cases it may not be possible to mount it in
this manner, and the installer will have to fabricate an
appropriate bracket or else be prepared to compensate
for the change in orientation when viewing the vibration
A representative installation is shown in the
Location of vibration sensor
Using the Vibration Analysis Screen
on the G3:
detects vibration in all 3 axis (fore-aft labeled x,
up-down labeled z, and left-right labeled y) which are
presented on different sub-screens. The vibration
analysis only functions when the engine is running and a
valid rpm signal is detected.
In regards to
the vibration graph, the vertical axis represents the
amount of vibration energy and the horizontal axis
represents the frequency spectrum expressed as multiples
of crankshaft rpm. When the engine is running, the
screen will come alive with a waveform that represents
the engine motion, presented in a spectral format with
the crankshaft energies appearing at the 1x mark on the
bottom scale. Propeller vibration will likewise be
synchronous with the crankshaft vibration. Other sources
of vibration will tend to produce energies at other
frequencies. For example, camshaft vibration tends to
accumulate at the .5x mark, since the cam turns at 1/2
the rate of the crankshaft. Magneto vibration will
appear at 1.5x mark in a 6-cylinder engine. Alternator
vibration may appear somewhere around 3x or 4x,
depending on the ratio it is driven at.
alternator may appear in a different axis than the
if it is mounted at 90deg to the engine, although
ANY source of vibration will show some energy in all
three axis. Complex vibration as generated by
reciprocating machinery will also produce a great number
of harmonic spikes, which at first glance may seem
confusing. The user should experiment with running the
engine at different power settings under different
conditions to get a feel for what is a "normal" spectrum
for their particular engine.
A simplified case of vibration is shown in the
In the example
shown above the main source of energy is at the 1x mark,
and represents the crankshaft rpm.
The smaller spikes at
the 0.5x mark and the 1.5x point are probably created by
the camshaft and the magneto, respectively. The user
should be aware that a multi-cylinder reciprocating
engine produces energies at a multitude of frequencies
and directions, which reinforce and subtract from each
other to create a very complex waveform.
It is the
responsibility of the user to gain familiarity with a
waveform that is typical of their particular engine, so
that unusual readings can be detected and interpreted.
The user may
examine the various sub-screens by pushing the top
button (PG). There are presently six screens to examine,
each of the primary axis (X,Y and Z) and an averaged
version of each (denoted Ax, Ay, and Az). The averaged
version will be much "cleaner" and contain less noise
than the raw measurement and is the preferred screen to
examine for each axis. The bottom knob (SEL) controls a
cursor which will "snap" to nearby vibration spikes to
make it easy to examine them closer. The bottom knob can
also be pushed to enter a zoom mode. When in zoom mode,
turning the bottom knob will allow you to scroll through
the waveform. Continue to press the bottom knob to set
progressively higher zoom modes. A further press when at
maximum zoom will return you to the overall view.
holding the PG button will trigger the G3 to save the
present vibration waveform for future reference.
waveform will be stored as a series of hexadecimal bytes
in the current log file. Insight can provide a tool for
examining this waveform using Excel or a similar
spreadsheet. The tool is presently in the earliest
functional stages of development, and will be improved
It is expected
that the vibration functions will be used as a
"condition-monitoring tool". Since every engine and
accessory combination is different, everyone's vibration
spectrum will look unique and it would be impossible to
generalize the interpretation of the spectrum. The user
will come to recognize what a "normal" spectrum looks
like for their engine and by periodically scanning the
vibration screen can recognize when potential trouble is
developing. When a new spike appears or an existing
spike begins to show signs of higher than normal
amplitude further investigation is warranted.
of the spike can be interpreted by noting its primary
axis and its frequency relative to crankshaft RPM as
discussed above. By periodically saving their vibration
data as discussed above, the user can create a database
of reference waveforms for future comparison.
$20.00 Charge For Printed Pilot's
To View And Print -
To Save - Right Click
- Save Target As
Insight also has adapter plates so a G3 - 2.25
will fit in a 3.125 hole.
Insight G3 replacement SD Card with the
latest code - Price $50.00 each
To order please call 905-871-0733 and ask for sales.