Compact Instruments A2105 Operating Instructions - Page 2

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Advent Ignition Tachometer
General description
Featuring a patented "Inverting" vertical LCD display which gives extremely good flexibility in
operation in almost any application, the instrument can be used in the normal mode or with the display
inverted for applications where access is difficult within confined areas.
The vertical display aids measurement through almost 270º. of operating angle where the user can read
the display readily throughout.
Hands free operation - once the instrument is turned on it will automatically remain powered up as long
as it is receiving input pulses.
Display features & Specification
Display
- Inverting LCD Vertical 5 digit display
Display functions
- 180º. Inverting
On target indicator
- Yes
Low Battery indicator
- Yes
Function icons
- rpm, rpm ×2 (1:2), Mx
Controls - 3 push-buttons
On/off normal mode
- Dual action rocker type touch push-button (UP ARROW)
On/off inverted mode
- As above but for inverted operation
Program control
- Selects 1 pulse / rev or 1 pulse / 2revs mode (1:2 symbol)
Measurement range - both models
Measurement ranges
- rpm, rpm ×2, maximum capture (in both ranges)
Speed range rpm
- 100 - 18,000 rpm
Resolution maximum
- ± 10 rpm
Accuracy
- ± 0.05% ± 10 rpm (± 0.5% maximum hold)
Timebase
- 0.8 seconds normal mode
0.1 seconds in maximum hold mode
- Last reading held for 5 sec's, automatic power down (4.5 minutes after
Memory features
last input pulse received or last button pressed)
Power requirements
- 4 x AAA alkaline cells
Standard kit - Includes operating instructions, Stub antenna & carrycase.
Operation of the Instrument
rpm measurement
1
Attach the stub antenna to the front of the unit. Start the engine and either point the
tachometer at one of the spark plug leads from a distance of up to 75mm or connect the
optional remote input lead to the BNC connector at the front off the instrument and attach the
clip to one of the HT leads. If the engine is a multi-cylinder one, then ensure the instrument is
close to one lead but at least 100mm away from any others or a false reading may occur.
2.
Momentarily press one of the ON buttons to turn the instrument on. The on-target icon will
glow or flash steadily, if not re-position the Instrument/lead relative to the ignition HT Lead.
3.
If the engine ignition system fires only once every other rev (e.g. 4-strokes) then select the
1:2 mode.
4
To select / deselect this mode press both the Program button and one of the ON buttons at
the same time and release both, the current range icons will flash, pressing either of the ON
buttons will toggle the range icons. To confirm the selection, press the Program button once.
Models A2105
(DOWN ARROW)
5.
To use in an inverted orientation simply press the Down button once and the display will
automatically invert.
6.
Maximum Capture - To enable maximum capture mode press the Program button once, the
instrument will now switch to fast timebase mode, the Mx icon will be visible and from now on
the display will only change if the current speed is the highest since the Program button was
pressed. To reset the maximum value ready to capture another reading, press the ON button
once.
7.
To exit the maximum capture mode, press the Program button once, the Mx icon will then
turn off and the Timebase will revert to 0.8 seconds and will continuously display the current
speed.
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