Speed Measurement; Frequency Measurement; Temperature Measurement - VOLTCRAFT AT-200 Bedienungsanleitung

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).
- Switch on the measuring instrument and turn the rotary switch (5) to 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 at engines without ignition distribution are performed in the "DIS
RPM" 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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c) Frequency measurement
In no event exceed the max. permitted input values. Do not contact
circuits or parts of circuits if you measure voltages higher than 25V
ACrms or 35V DC pending within them.
Proceed as follows to measure the frequency:
- Connect the black measuring line with the COM socket (7) and the red measuring
line with the VΩ-socket (6) till they are plane at the measuring instrument.
- Set the range selection switch (5) to position "Hz".
- Now connect the two measuring prods to the object to be measured (generator,
switching etc.).
- The current measuring value is shown on the display (1).
Proceed as follows to measure the pulse-pause ratio (duty cycle):
- Press the "Hz/%" button (2). You switch over these two measuring functions. The
measurement unit "%" appears on the display.
- Now connect the two measuring prods to the object to be measured (generator,
switching etc.). The current measuring value is shown on the display (1).
d) Temperature measurement
In no event exceed the max. permitted input values. Do not contact
circuits or parts of circuits if there could be voltages higher than
25V ACrms or 35V DC pending within them !
The temperature measurement can be performed only at the connection sockets (6)
= + and (7) = - and only by means of K-type thermosensors. Use the multipurpose
plug with the correct polarity for connecting the thermosensor.
The temperatures may only be applied at the sensor. The measuring instrument is
only specified (guaranteed precision) for an ambient temperature of 23°C (+/-5°C).
Proceed as follows to measure temperatures:
- Remove all measuring lines from the multimeter and set the range selection switch
(5) to position "C" or "F" (Fahrenheit).
- Insert the enclosed multipurpose plug with the correct polarity into the sockets (6)
and (7).
- Now, insert the plug of the K-type thermosensor with the right polarity (narrow
contact stud = +) into the multipurpose plug. Then, the temperature is indicated in
"°C" (Celsius) or "°F" (Fahrenheit) on the display.
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