SkyRC Multimeter - Manual (Page 13)

www.skyrc.com - 13 -
TACHEOMETER RPM
The fluctuating light caused by the rotation of the propeller is sensed
and counted over a period of either 1 or 2 seconds. Allow a couple of
seconds for readings to steady.
TACHEOMETER RPM
There is an optical tachometer within i-Meter. An optical tacho sensor is
fitted to the right side i-Meter case and is activated by pointing i-Meter
towards the propeller at a distance of 10 and 20cm from the propeller.
Connect battery to i-Meter via Voltage Port to power on the i-Meter
Press ‘MODE’ to select “TACHOMETER RPM”
Press ‘ENTER’ to confirm the function
Press ‘MODE’ again to change the range of 1-5 blades
Press ‘ENTER’ to start RPM measurement
To use the Servo Tester to operate an ESC and motor
Connecting a battery to the i-Meter volt port. Another plug connected to
the Servo Tester is the plug from the ESC that normally goes to the
receiver. Connect the ESC to motor leads. When you connect the
battery to the ESC it will power up. It should react the same way
does when powered up using the radio gear with the throttle stick in
the minimum power position. You can now spin up the motor by turning
the servo tester knob. No receiver or transmitter is needed. This is a
great way to test motors on the bench.
T A C H O M E T E R
2 B l a d e s
t a c h o : 5 5 2 0 r p m
p e a k : 5 6 0 0 r p m
With a geared motor, the motor RPM will normally be higher than the
prop. RPM, but it is the prop rpm which is being measured and quoted,
so the gear ratio is not really relevant.
10-20cm