Dawson Tools DDM450 Manual - Halaman 8

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Halaman Cetak
Diode Test
Description
Resolution
Display shows the forward-biased
0.001V
voltage drop of the diode.
•
Overload protection: 600V rms
Open circuit voltage: ~3.2V DC
•
•
Test current: ~ 1.0mA
Battery Voltage Measurement
Range
Resolution
9V
0.01V
1.5V
0.001V

MAINTENANCE

9.
This section provides basic maintenance principles, including replacing
batteries and fuses.
Do not attempt to repair or perform any maintenance on the meter not
included in the section below unless you are qualified personnel.
CLEANING
10.
To prevent injury or damage to the meter, do not allow moisture
inside the casing. Before opening the battery cover/case,
disconnect test leads from all circuits.
Clean the meter regularly with a damp cloth and a small amount of
detergent; do not use abrasives or solvents. Dirty/wet input jacks can
affect readings.
To clean input jacks:
1. Turn off the meter and remove test leads.
2. Brush off any dirt or contaminants from the input jacks.
3. Use a cotton swab with a cleaner/lubricant (i.e. WD40)
to clean the input jack.
4. Use a new swab on each jack to prevent cross contamination.
Accuracy
±(1.2% of reading +7 digits)
±(3.0% of reading +5 digits)
WARNING
15

REPLACING THE BATTERY

11.
To avoid false reading that could lead to injury or damage to the
meter, replace the batteries as soon as the "
Turn off the meter and remove the test leads before opening the
battery cover to avoid injury or damage to the meter.
To replace the
battery
:
1. Turn off power to the meter.
2. Remove test leads from input jacks.
3. Loosen the screw on the battery cover and remove cover from meter.
4.
Replace used battery with a new one.
5. Replace battery cover and secure to meter.

REPLACING THE FUSES

12.
To prevent injury or damage to the meter,
turn off power to the meter and disconnect test leads
from
input jacks
To replace the fuses:
1. Turn off power to the meter.
2. Remove test leads from input jacks.
3.
Remove the 6 screws on the back case
and remove back case from meter.
4.
Replace blow fuse(s) with new fuses of the
same electrical ratings (see specifications).
5. Replace back cover and secure to meter.
DISPOSAL / RECYCLE
13.
Caution: This symbol indicates that equipment and its accessories
shall be subject to a separate collection and correct disposal.
WARNING
" symbol appears.
WARNING
before opening case.
16