Handling And Maintenance - Maxwell 25303 User Manual

Frequency measurement
Connect the measuring wire or shielded cable
•
to the „COM" and „VΩHz" connectors.
Set the function switch to „30MHz" and touch
•
the wires to the signal source.
Note:
Do not measure frequency on higher voltage than
•
250V(RMS)
In a noisy environment it is recommended to use a
•
shielded wire when measuring weak signals.
Avoid touching the circuit when measuring high
•
voltage.
Range selection is always automatic when measuring
•
frequency.
Duty cycle measurement
Set the function selection switch to 30MHz and
press the Hz/DUTY button once to measure
duty cycle.
Data hold function
By pressing the HOLD button the actual
measured value gets held on the screen until
the button is pressed again.
Warning
When measuring voltage make sure that the wires do
•
not connect to the current measurement connector
and the function switch is not in a resistance or diode
measurement position. Always make sure that the wires
are connected to the proper connector.
Take care when measuring voltage above 50V, especially
•
with high power devices.
Avoid connecting to 'live' circuits.
•
When measuring current make sure the circuit is not
•
under voltage before connecting the multimeter.
Before measuring resistance and diode make sure the
•
power is disconnected for the time of measuring.
Always use the proper function and measuring range.
•
If you are unsure about the range, select the highest
available and move backwards from that.
Make sure that the measuring wires and their insulation
•
are intact.
Be careful, do not go over the specified overload
•
thresholds.
Only replace fuses to those of the same type and value.
•
When opening the lid of the device for replacing fuses or
•
batteries make sure that all external power sources are
disconnected and the function switch is in OFF state.
H
andling and
M
aintenance
Handling
Keep the multimeter dry at all times. If it
•
becomes wet, wipe it immediately. Liquid may
corrode the circuits.
The multimeter may be stored and
•
operated only at normal temperatures. High
temperatures reduce the lifetime of electric
devices, damages the batteries and distorts/
melts the plastic parts.
Handle the multimeter with care. Dropping
•
it may result in damage to the circuits and
the surface which may cause improper
functioning.
Protect the multimeter from dust and other
•
dirt which may cause the untimely wearing of
the parts.
Clean the multimeter with a wet cloth. Do not
•
use chemicals, solvents or strong detergents
for cleaning.
Maintenance
Battery replacement (2 x 1,5V AAA)
•
Disconnect all external circuits from the
•
device. Turn it off and remove all measuring
wires.
Unscrew the bottom lid.
•
Remove the depleted battery and replace to
•
one of the same type.
Fuse replacement
Disconnect all external circuits from the
•
device. Turn it off and remove all measuring
wires.
Unscrew the bottom lid.
•
Remove the melted fuse and replace to one of
•
the same type and value.
EN
User Manual