Spectrum DX8, Instruction Manual

Page: 19 / 208

19 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL
5. From the main screen rotate the roller to access the telemetry screen and
verify the flight log data and receiver voltage displays.
Temperature, voltage and Optional RPM Sensors
The TM1000 includes a temperature and external voltage sensors. Optional RPM
sensors are available for Gas/Glow and electric brushless models to monitor RPM.
Temperature Sensor
To monitor the temperature of most any component, secure the sensor on the
object. It must come into contact with the surface to get an accurate temperature
reading. You can loop the temperature sensor around the engine’s cylinder head
to assist in tuning an engine. To monitor battery temperature, you can wrap the
sensor around the battery.
The mounting position of the sensor, especially on gas or glow engines, will
result in different temperature readings. So it’s important to experiment with
different positions.
Installation
Insert the temperature sensor connector into the port labeled TEMP/VOLT.
The temperature sensor is now active and the actual temperature displays
on screen.
External voltage
External voltage telemetry is commonly used to monitor flight pack voltage or
you can monitor ignition batteries on gas engine equipped aircraft. You can set
warnings to prevent over-discharging batteries.
Installation
Plug the connector of the voltage sensor into the TEMP/VOLT port in the
Telemetry module.
Attach the opposite ends of the voltage sensor (stripped wires) to the
voltage source you wish to monitor.
Note the polarity (Red = + positive /Black = - Negative).
Typically, you can solder the wires to the battery connector. At this point the
External voltage displays on the telemetry screen.
Note: A Y-harness is provided if you want to use temperature and voltage
sensors simultaneously.
RPM (optional sensor sold separately)
Two RPM sensors are available: SPMA9569 for nitro and gas engines,
SPMA9558 for brushless electric motors.
Engine RpM Sensor
The optional engine RPM sensor mounts inside the backplate of aircraft engines.
The sensor picks up the crankpin as the engine rotates giving accurate RPM.
Additionally, you can use this sensor as an RPM pickup on any rotating gear/
collar or shaft that has a steel setscrew or other magnetic metal by locating the
sensor within 5 mm of the rotating steel object.
Note: On some engines you may need to space the sensor further away
from the backplate. The sensor picks up the crankpin only; on some
engines if the sensor is too close, it will not distinguish the crankpin from
the crank weight.
Installation
Install the backplate sensor in the backplate.
Install the connector into the RPM port in the TM1000.
Testing
Turn the transmitter and receiver on and scroll to the RPM telemetry screen.
Rotate the engine rapidly and the RPM should register on the screen.
The RED LED on the TM1000 indicates the sensor is picking up properly.
You may need to adjust the sensor’s position to optimize the pickup. Move
the sensor closer or farther away until you have a reliable RPM pickup.
EN