Aim MyChron 4 Guide

Technical Documentation - Datasheet MyChron 4 – Version 1.00 1
TECHNICAL DOCUMENTATION 13/02/2006 LOGGER
Notes: MyChron 4 technical documentation, dimensions and pinout Version 1.00 MyChron 4
Figure 1: Display MyChron 4
Introduction
MyChron 4 represents the new philosophy of AIM data acquisition
systems: a data logger with graphical display, easy to configure, easy to
read and, what make sit unique: expansible.
MyChron 4 has a graphical display that allows you to see the graphical
representation of your values, configurable RPM, Optical or Magnetic Lap,
1 Mb internal memory and capacity to record up to 1000 lap with up to 4
splits or 3 hours of sample at a 10Hz sampling frequency for channel, 1
temperature (water, exhaust gas or cylinder head, thermocouple or
Thermoresistor) and the automatic switch-off after 8 minutes of inactivity
(only external power versions).
Moreover MyChron 4 computes forecast lap time and shows times as
absolutes and as difference with the previous lap.
All these potentialities can grow with the optional E-box connected via
CAN to MyChron 4. Thanks to this expansion acquired channels will grow
in a very simple and quick way. the E-box, in fact, has two others
temperature channels and the speed channel (that together with MyChron
4RPM allows you to compute and show engaged gear number).
The logger shows the following parameters:
•1 temperature input (cooling water, cylinder head or exhaust gas,
thermocouple o Thermoresistor);
•RPM;
•Lap/Split Time;
•Logger or kart battery voltage;
The values stocked in 1Mb internal Memory can be downloaded both via
CAN on the 32 Mb Data Key memory (optional) and via USB and Data

Technical Documentation - Datasheet MyChron 4 – Version 1.00 2
Key on a PC. This options avoid you to always have a Pc available for
data download.
Both MyChron 4 and the optional E-box can be internally and externally
powered. MyChron 4, can also be powered by a magnet.
Internally powered versions need one 9 V battery, while externally
powered versions needs an external 9-14,5 V power source (the kart
battery for instance).
Installation notes
•Most of steering wheels have existing holes in the 3 central arms
that will accommodate your MyChron 4 display unit;
•If the steering arms are solid, mark the point where the hole is to be
drilled and then indent a drill reference point with a large nail or hole
punch, to minimize drill wander;
•Do not over-tighten the locknut: over-tightening it may seriously
damage the display unit chassis;
•We suggest to use plastic washers, given as stock, to keep your
MyChron 4 separate from the steering wheel;
•Once the gauge has been correctly installed, please plug the 3
sensors in the connectors on the instrument’s back part.
Display description
Figure 2: Display Description MyChron 4 on line.
RPM
Bar graph
Digital RPM
value
Low battery
warning
Nr. of last
ended Lap
Lap Nr
Best for best Lap
Time.
Forecast for
forecast Lap Time
BEST / FORE
1 Temperature
Settable Unit of
measure Lap Time

Technical Documentation - Datasheet MyChron 4 – Version 1.00 3
MyChron 4 data download
The new MyChron4, thanks to its optional Data-key (Figure 3) allows you to
download data in two ways:
–on the same Data Key
–on a Pc
Figure 3: MyChron4 Data Key
Using only the Data Key you only need to connect Data Key Binder male
connector to the one labelled Exp/Pc on the back of the loggerand data
download starts automatically without the necessity of a Pc available.
Using the Pc:
–connect the Data Key both to MyChron4, as said before and to the Pc
USB port
–run Race Studio 2 software
–activate data download pressing the button corresponding to MyChron4
in Race Studio2 main window.
Software
When the logger is correctly installed and sensors have been plugged in,
please configure your logger to acquire consistent and correct information.
MyChron4 is completely configurable via keyboard.
To donwload data in a Pc you need Race Studio 2, the software properly
developped by Aim to analyze acquired data and supplied together with
the Data Key.
MyChron4 – Power notes
MyChron4 is available in two different versions: internally powered
and externally powered.
•MyChron4 with internal power needs a 9V battery;
•MyChron4 with external power needs an external 9-14,5 V power
source (the kart battery for instance). This version of MyChron4
has two cables, one red (power) and one black (GND) outcoming
from the back of the logger and have to be connected to the
external power.

Technical Documentation - Datasheet MyChron 4 – Version 1.00 4
Dimensions
87.7
[3.45]
125.7
[4.95]
[0.81]
45
[1.77]
Dimensions in millimetres [inches]
Connector Detail (Lap)
Pin Function Pin Function
1 Magnetic Lap 3 V battery
2 GND 4 Optic Lap
Connector Detail (Temperature)
Pin Function Pin Function
1 Thermocouple 3 Thermoresistor
2 GND
Female Binder connector pinout (external
view): 4 pins (left) and 3 pins (right)
Connector Detail (Exp/Pc*)
Pin Function Pin Function
1 Can 0+ 4 Can 0-
2 GND 5 Ext. Battery
3 +VB
*CAN Connector for external expansion modules
Specifications
General
Characteristics Value
Input Channels 3 (Lap, RPM, Temp.)
Int. power One 9 V battery
Ext. Power 9-14,5 V
Working Time About 200 hours int. power
Internal Memory 1 Mb
E-box Interface CAN
Data-key Interface CAN
PC Interface Porta USB
Sampling Freq. 10 Hz
Other
characteristics Value
Weight 293 g (batteria inclusa)
Display dimensions 78 x 43 mm
Impermeability IP 65
5 pins female Binder connector pinout
(external view)
1
5
2
4
3
41
3231
2