Urrea UD77, User Manual And Warranty

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E N G L I S H
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precision circuits or measurements.
Follow these steps to measure DC (or AC)
Amperage:
1. Set function and range switch to the
desired DC A (or AC A) range. If you do
not know the value of the current to be
measured, always start with the highest
range and reduce the setting as required
to obtain a satisfactory reading.
2. Plug the red test lead into the “mAμA”
input terminal (if the 10A range is
being used, plug the red lead into the
“A” input terminal) and the black lead
into the “COM” input terminal of the
instrument.
3. Disconnect the power from the circuit to
be tested.
4. Connect the test leads in series to the
circuit to be tested.
5. Reapply power to the circuit, the
measured current will appear on the
display of the instrument.
6. Disconnect power to the circuit before
removing the test leads from the circuit.
5. MAINTENANCE AND
REPLACEABLE PARTS
5.1 General Maintenance.
WARNING: REPAIRS OR SERVICING NOT
COVERED IN THIS MANUAL SHOULD ONLY
BE PERFORMED BY QUALIFIED PERSONNEL.
TO AVOID ELECTRICAL SHOCK RISK, DO
NOT SERVICE UNLESS YOU ARE QUALIFIED
TO DO SO.
Periodically wipe the case with a damp
cloth and detergent; do not use abrasives or
solvents. Water, dirt or contamination in the
“A” or “mAμA” input terminals may harm
this Meter.
Calibrate this Meter once a year to maintain
its performance specifications.
5.2 Battery Replacement.
The Meter uses a 9V battery (NEDA 1604
or IEC 6F22). To replace the battery remove
the two screws of the battery compartment
from the back of the Meter and lift off the
cover of the compartment.
Replace the battery. Reattach the battery
compartment to the back of the Meter and
reinstall the screws.
5.3 Fuse(s) Test and Replacement.
5.3.1 Fuse(s) Test.
To test the internal fuses of this Meter:
1. Set the rotary switch to “ ” position.
2. Turn this Meter on.
3. To test F2 fuse (15 A, 600V), plug a test
lead into the VΩ input terminal and
touch the probe to the A input terminal.
The display should read about 0.000V. If
the display reads
(overload), replace
the fuse and test again. If the display
reads any other value, have this Meter
serviced.
4. To test F1 fuse (2 A 600V), move the
probe from the “A” input terminal to
the “mAμA” input terminal. The display
should read between 0.5 V and 0.6V. If
the display reads
(overload), replace
the fuse and test again. If the display
reads any other value, have this Meter
serviced.
5.3.2 Fuse(s) Replacement.
1. Unplug the test leads. Remove the
rubber boot from the instrument.
2. Remove the screws in the rear of the