Taskem 4000 User Manual

SPECIFICATIONS
 GENERAL
 DISPLAY FORMAT: Digital and pseudo-analog.
1
 DIGITAL DISPLAY: 4 / 2 digit, high contrast, direct drive liquid crystal display
1
with / 2 " high characters. All digits and legends visibly tested on power up.
Backlight for night or dusk viewing.
 ANALOG DISPLAY: Light Emitting Diodes, 1 yellow, 10 green, 1 red.
 DATA UPDATE RATE: 0.6 seconds.
 TIMING/FREQUENCY REFERENCE: Quartz crystal.
 ENGINE COMPATIBILITY: Virtually unlimited via selectable sensitivity,
filtering, pulses per revolution, averaging and full-wave or no rectification.
 POWER: 8 to 35VDC @ 22 mA without backlight. Backlight draws additional
11 mA. A 9V battery holder is included on back of instrument.
 BATTERY LIFE: A 9V alkaline battery will power the instrument for over 24
hours (16 hours with backlight on continuously). 9V lithium batteries will
operate approximately 4 times longer than alkaline.
 LOW BATTERY INDICATOR: A flashing "LOBAT" symbol appears when
voltage drops below 6.9V. At this point an alkaline battery will operate for
approximately 4 more hours, lithium longer.
 SERIAL OUTPUT: Asynchronous, bipolar RS-232 with 8 data bits, no parity
and 2 stop bits at fixed 9600 Baud. RPM output every 0.6 seconds in ASCII
format with Last Flight time appended once per minute. Each data set is
terminated with carriage return and line feed.
 WEIGHT: Less than 10 oz. with 9V alkaline battery.
 DIMENSIONS: Standard 3
face of instrument panel (including 9V battery) is 4
 TEMPERATURE RANGE: Full accuracy and performance from -20 to +60C
(-4 to +140F). LCD response becomes sluggish below -10C (+14F).
 TACHOMETER FUNCTIONS
 RANGE: 0 to 19,990 RPM
 RESOLUTION: 10 RPM
 REDLINE: Flashing red LED when RPM exceeds preset value. Value can be
set from 2,000 to 19,950 RPM.
 YELLOWLINE: Continuous yellow LED when RPM falls below preset limit.
Value can be set from zero to 1,500 RPM.
 GREEN LEDs: Evenly span YELLOWLINE to REDLINE settings.
 ACCURACY: Better than 0.04% of reading, (4 RPM @ 10,000 RPM).
 TIMER FUNCTIONS
 TOTAL ACCUMULATED ENGINE TIME: 0 to 1,999.9 hours in 0.1 hour (6
minute) steps. Factory settable.
 LAST/CURRENT TIME: 0 to 99:59 (99 hours, 59 minutes) in 1 minute
increments. Current time is viewable in RPM mode by pressing MODE button.
 TIMING ACCURACY: Better than 0.04% of reading (0.1 hour @ 250 hours).
Taskem Corp.
12 Tickles Road
Westport, MA 02790
1
/ 8 " instrument case outline. Depth behind back
1
/ 2 ".
Voice  508–679–9339
Fax  508–646–2755
www.taskemcorp.com
User's Manual
Model 4000 Tachometer
Congratulations on your purchase of
the Model 4000 tachometer. It is a
second generation instrument that
incorporates several improvements and
features over our very successful
Model J tach. Please take a few
moments to thoroughly review this
manual so you can take full advantage
of all of its features, many of which are
not readily obvious.
The tach simultaneously displays
revolutions per minute (RPM) in both
digital and analog formats. The digital format uses a liquid crystal display
(LCD) showing up to 19,990 RPM in 10 RPM steps. The LCD is backlighted
for night viewing and since it uses "direct drive" it does not washout in sunlight
or when viewed from an angle. The analog format is presented as a ring of
light emitting diodes (LEDs) around the perimeter of the front panel. Since this
is not true analog but emulation, it is generally referred to as pseudo-analog.
The range of RPM that the LEDs represent can easily be adjusted to suit any
engine or user preference.
The instrument can be powered from a DC source of from 8 to 35V. Since its
power drain is low and 9V batteries are readily available, a 9V battery clip is
provided on the back of the case. If you prefer to operate it from 14 or 28V
aircraft power, cut the battery clip off and connect directly to the wires. Or,
procure a mating 9V battery clip (available at Radio Shack) and snap the two
battery clips together. This will provide two input wires without having to cut
and destroy the existing 9V clip. Since battery clips are not usually mated to
each other the polarity will be reversed. For instance, if the battery clip you
purchase has red and black wires signifying positive and negative, you will
have to connect power backwards (i.e. red to negative). This is not risky since
the instrument is protected for polarity reversal and will suffer no damage if the
polarity is wrong; it will just not operate. Simply reverse the wires.
The three-position POWER switch provides the means to turn the backlight
on and off. The ON position operates the instrument with no backlight and the
LIGHT position powers it with backlight. The additional drain with the
backlight on should be taken into consideration when operating from a 9V
battery, as its lifetime will be reduced. Some typical lifetimes with various