Maxwell 25304 User Manual page 5

DC and AC current measuring
Connect the black wire to the „COM" and the
•
red one to the „mA" connector (max. 200 mA)
or the „20A" connector for measuring 200 mA
or 20 A.
Set the function switch to the proper range.
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Connect the the wires to the circuit serially.
•
For measuring current between 200 mA and 20
•
A follow the instructions above, but connect
the red wire to the „20A" connector.
Note:
If you are unsure about the magnitude of the result,
•
set the switch to the highest possible range and go
backwards until you reach the correct setting.
If only an „OL" is displayed on the screen, it signals
•
overload. Switch to a higher range.
The maximum inward current is 200 mA or 20 A
•
depending on the connector. (For maximum 15 seconds.)
Too much currency overheats the fuse which needs to be
replaced. The 20 A measuring range is not protected.
Maximum overload voltage: 200 mV.
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Resistance measuring
Connect the black wire to the „COM", and the red
•
one to the „V / Ω" connector.
Set the function switch to the desired resistance
•
range.
Touch the wires to the measured circuit paralelly.
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Warning: make sure that the measured circuit is
not under power!
The maximum overload capability for the
•
connector is 250 V RMS (for maximum 10
seconds).
Note:
If the measured resistance value is over the maximum
•
threshold and the device signals overload („OL"), select a
higher range. When measuring above 1 MW it may take a
few seconds for the device to stabilize the displayed value.
This is completely normal for such resistors.
If you do not connect a resistor to the connector (or there is
•
a break) the display will show „OL" .
If you are measuring a resistor that is part of a circuit make
•
sure that the circuit is not under power and all capacitors are
discharged.
Do not connect inward voltage to the device as it may lead to
•
damage to the inside circuits.
The outward voltage on connectors not under power is
•
approximately 3 V.
Capacity measuring
Set the function switch to "2 mF" position.
•
Connect the measured capacitor to the „V /
•
Ω" and "COM" connector. Pay attention to the
correct polarity.
Note:
If the measured value exceeds the maximum value of the
•
selected range and the device signals overload („OL").
Unit: 1 nF=10 μF or 1000 pF
-3
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Do not connect external voltage or current to the connector!
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Turn off the power and discharge the capacitors before
measuring. Also discharge the electrolyte capacitors before
measuring!
Before measuring discharge the electrolyte capacitors
•
more times.
Diode and continuity test
Connect the black measuring wire to the
•
„COM", the red one to „V / Ω" connector. (Note:
the polarity of the red wire is: +)
Set the function to „
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Touch the wires to the diode's connectors.
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The screen shows the opening voltage of the
diode.
Connect the wires to two points of the circuit. If
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the resistance is below 90 Ω the device beeps.
Note:
If you do not connect a unit to the connectors (or there is a
•
break) the display will show „OL" .
During the test 1 mA current goes through the diode.
•
The display shows the opening voltage of the diode in mV,
•
and overload if the diode is connected with the polarity
reversed
Temperature measuring
Set the function switch to "°C/°F" position.
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Connect the black wire of the temperature
•
measuring sensor to the „COM" connector and
the red one to the „V/Ω" connector. Put the
sensor to the place measured. The display shows
the measured value in °C or °F (press "HOLD"
button to select).
Note:
The device functions with a special temperature measuring
•
sensor.
If the sensor is not connected to the connector, the device
•
displays the temperature of the environment.
Do not connect outward voltages to the connectors, if the
•
device is in temperature measuring function.
Transistor hFE test
Set the function switch to "hFE" position.
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Determine if the transistor is NPN or PNP and
•
place it in the proper connector.
The amplification factor of the transistor is
•
displayed on the screen.
IB = 10 μA, VCE = 2,8 V
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EN
User Manual
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