Temperature Measuring; Maintenance - Maxwell Digital Multimeters 25221 User Manual

in case of weak signals it is recommended to use shielded
wires for accurate measuring.

temperature measuring

Warning: to avoid electric shock, never place the
temperature sensor in an electronic environment!
Set the function switch to ºC position!
•
Connect the K type measuring sensor to the
•
multimeter. Connect the red part to the ºC
connector and the black part to the „COM"
connector.
Connect the sensor to the tested object or
•
place it in the measured environment.
Read the temperature from the screen.
•
Current measurement
Warning: to avoid damage to the device always verify
the fuse before measuring. use the prescribed connectors
only.
Set the rotating switch to 4000μA, 400mA or
•
10A mode.
Press the „FUNC" button to select DCA or ACA
•
measuring mode.
Connect the black measuring wire to the
•
„COM" connector and the red one to the mA
terminal for max. range of 400mA or 10A for
max. range of 10A.
Connect the multimeter to the circuit serially.
•
Read the measured value from the screen. In
•
case of DC measuring the polarity of the red
cable is also displayed (negative only).
If the display shows „OL" and the device is
•
constantly beeping, switch to a higher range.
M
aintenance
general
Warning: to avoid electric shock, do not let water get
inside the device!
Clean the device regularly with a wet cloth, you
may use water with mild detergent, but do not
use strong detergents, solvents or abrasives.
Dirt on the connectors may interfere with the
measured results.
Turn the device off and remove the measuring
•
wires.
Shake the possible dirt out from the
•
connectors.
Dip a cotton swab into some contact material
•
(like WD-40)
Wipe the connectors and their area.
•
Fuse replacement
Warning: Before replacing the fuse remove the
measuring wires from the device. Only use fuses of the
prescribed size and type!
Turn the device off (OFF mode)
•
Remove the measuring wires from the
•
connectors.
Use a screwdriver to remove the 3 screws on
•
the back of the device which hold the cover lid
and the 2 screws beneath it.
Remove the back panel.
•
Replace the melted fuse with another one: F
•
500mA/250V Ø5x20
Replace the back panel and replace the screws.
•
Battery replacement
Warning: remove the measuring wires from the device
and the measured circuit before replacing the battery!
If the battery's power runs under the normal
•
operating level, a small battery icon will show
up on the screen.
Turn the multimeter off.
•
Remove the measuring wires.
•
Unscrew the battery holder lid.
•
Replace the batteries with 3 new 1,5V AAA
•
ones.
Screw the battery holder lid back.
•
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