DTI Fast-Tach User manual

LIMITED WARRANTY: Design Technology, Inc. warrants that for a period of ONE (1) YEAR from the time
of purchase it will repair or replace the Fast-Tach at no charge, if it fails to function properly due to defect in
materials or workmanship. Damage due to improper care or use is expressly excluded from this warranty. All
implied warranties are limited to the use of this instrument as directed above and Design Technologies does not
assume of or authorize anyone to assume for it any other obligation. The instrument should be returned, prepaid
to Design Technology Inc. for warranty consideration
Design Technology, Inc.
768 Burr Oak Drive
Westmont, IL 60559
630.920.1300
(Fax: [phone])
www.tinytach.com
The Fast-Tach is “Pulse” activated tachometer - i.e. the pulses
generated by the ignition system on any gasoline engine can be
detected and activate the electronic tachometer. The tach can
be set to display proper RPM on a single cylinder as well as multi
cylinder, two or four cycle, engine. By aiming the tach towards the
spark plug at a distance of approx. 0 to 15 inches (0 to 35 cm) the
tach will display proper engine RPM. The tach can also display the
MAXIMUM RPM recorded after checking the RPM of an engine.
Basic operation:
1. To start the Fast-Tach push the ON button and the
Fast-Tach is ready to display the actual RPM of an
engine that produces 1 spark per revolution (to change
spark pulses per revolution see page 2). Hold the tach
0 to 15 inches (0 to 35 cm form the spark plug.)
2. Fast-Tach will save the Maximum rpm that the unit has read.
To view press the On/Mode button and the “MAX” will appear on the
display (to reset MAX rpm see page 2)
3. Fast-Tach will turn OFF automatically after 1 minute.
See back for advanced operations ➜
Features: Activation: Pulses from the ignition triggers the Fast-Tach to read engine RPM.
Fast-Tach can be set to properly record any single or multi cylinder
engine, 2 or 4 cycle by changing the display mode (see advanced
operation pg2). Default setting is 1 pulse per revolution (360°)
adjustable to 1 pulse per every 2 revolutions (720°) or 2 pulses per
revolution (180°)
Acuracy: +- 10 rpm in default mode and +- 20 in 720° mode. Display updated
every 0.5 seconds
Max reading: 19,990RPM
Battery: Lithium 3V (CR2430) - Replacable
Wireless Tachometer

Adjust RPM reading as follows:
1. Fast-Tach must be on and in “RPM mode
Advanced Operation
RPM Set-up:
Determine the amount of pulses (sparks) per engine revolution. Most
common is 1 spark per revolution - (360° default setting).
If you are unsure which setting your engine needs, start the engine and
read the RPM with Fast-Tach. If you know the idle speed is normally
1200 rpm and the Fast-Tach reads 600 rpm then your engine has a spark
every second revolution. You need to change RPM mode to 720°
1. Fast-Tach must be on and in RPM mode (0000 on the display)
2. Push and hold the ON/MODE button, the display rst shows “MAX” continue holding ON/MODE
button till the word “RESET” appears then let go.
3. The display will show “0000” after another second and the MAX RPM is now reset to 0000.
TIP:
Remote Pulse Pickup
Loop a piece of wire around ignition lead wire and lay
Fast-Tach on top of the wire. Fast-Tach should
now read normally
Resetting the “Maximum RPM”.
45° = 8 sparks per revolution
60° = 6 sparks per revolution
90° = 4 sparks per revolution
120° = 3 sparks per revolution
180° = 2 sparks per revolution
360° = 1 spark per revolution
720°= 1 spark per 2 revolution
2. Press and release ON/Mode button until “FUNC” appears, (do not release button) continue holding button until
“RESET” appears then release button and the display will show only “FUNC”. Press and release ON/Mode
button to toggle between modes (720° 360° 180° 120° 90° 60° 45°) until desired mode is displayed, release
button wait 5 sec. the RPM mode is changed and the unit will display “0000” and is ready to read engine RPM.
To Decrease RPM Reading
s