VOLTCRAFT AT-200 Notice D'emploi page 34

g) Speed measurement
The speed can be measured at petrol engines with and without ignition distributors.
The speed is measured in an inductive manner at an ignition cable by means of a
clamp-on meter.
Use this function only for insulated cables to avoid possible
contacts!
When connecting make sure that wires or clothes, hair etc. cannot
get into the rotating parts of the engine unit. Do not touch live
parts!
Proceed as follows to measure the speed:
- Connect the black measuring line of the speed meter with the COM socket (7) and
the red measuring line with the V-RPM socket (6).
- Turn on the meter and turn the knob (5) at 4-stroke engines in position "RPM".
"RPM" appears on the display.
- Switch off the engine to be measured and connect the speed meter with an igniti-
on cable.
- Start the engine and read the speed.
- If "OL" appears on the display, the measuring range is exceeded. Switch the rotary
switch to the next measuring range "X10RPM". Now, the measuring value indica-
ted is to be multiplied by 10.
- Measurements on engines without ignition distribution and 2-stroke engines are
performed in the "DIS RPM" or "DIS X10RPM" range.
h) Dwell angle measurement "DWELL"
The dwell angle measurement can be performed at engines with 2, 3, 4, 5, 6, 8 and
10 cylinders.
Proceed as follows to measure the dwell angle:
- Set the range selection switch (5) to position "DWELL" and the relevant number of
cylinders.
- Connect the black measuring line with the COM socket (7) and the red measuring
line with the V-mA socket (6).
- Switch off the engine to be measured.
- Connect the black measuring prod with the negative pole (vehicle mass) of the bat-
tery and the red measuring prod with the contact breaker point.
- Start the engine and read the dwell angle indicated by the measuring instrument.
When connecting make sure that wires or clothes, hair etc. cannot
get into the rotating parts of the engine unit. Do not touch live
parts!
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