Revolution Counter Use - Tecnotest STARGAS 898 LIGHT Manual Operativo

______________________________________________________________________________ STARGAS
3.3 -

Revolution counter use

To measure the rpm you can use the internal revolution counter of the tool that
processes a signal from the battery positive terminal and detects the rpm. That is set
for 4-cylinder engines, but also 1, 2, 3, 5, 6, 8, 10, 12 cylinder can be set.
Connect cables as follows:
•
Connect the RPM cable from battery (46) to the battery positive pole.
•
Connect the ground cable (44) to the vehicle chassis.
•
Start the engine.
NOTA BENE:
If the programme displays the RPM RANGE SELECTION page, usually when the engine
rpm number is lower than 700 RPM or when it exceeds 900 RPM, it is necessary to
select the RPM value being nearest to that of the tested engine. The programme
processes the data by setting as predefined value the measure it deems to be more
correct.
After carrying out the relevant checks the operator shall select the most reliable
measure (by using the cursor shifting keys) and confirm by ENTER.
If during the tests the rpm is unstable (anomalous values) the problems are due to the
generator charge pulses or to the charge current pulses interfering with the continuous
current of the electrical system.
These currents cause a voltage drop on the electrical system lines that can be
measured by the tool revolution counter.
In case you have problems during tests check:
•
Measuring the speed functions better with a partially discharged battery than with
a fully charged one. It is, therefore, worthwhile switching on several loads for a
few minutes before starting the engine.
•
During measurement switch on several loads such as the lights, rear window
heating etc.
•
Once the engine is on, press down fully on the accelerator, the generators
regulator can only be activated through this.
•
Be sure that the V-belt used to drive the generator does not slip off, otherwise
faulty measurements could occur whilst the engine is accelerating.
•
In some vehicles a switched on fan can distort measurement. In this case, switch
off the fan.
OPERATING INSTRUCTIONS 33