Urrea UD112, Руководство пользователя и информация о гарантии

Страница: 25 / 32

E N G L I S H
25
following table:
Range Input Ranges
mAµA 400.0 μA, 4000μA
mAµA 40.00 mA, 400.0 mA
10A 4.000 A, 10.00 A
* To avoid blowing the meter’s 440 mA fuse, use the
mAμA terminal only if you are sure the current is less than
400 mA.
3. Open the current path to be tested. Touch
the red probe at the more positive side of
the break and touch the black probe at the
more negative side of the break. (Reversing
the leads will produce a negative reading,
but will not damage the meter.)
4. Turn-on power to the circuit and read the
display.
5. After measuring current, turn-off power
to the circuit and discharge all high-voltage
capacitors. Disconnect the meter and restore
the circuit to normal operation.
Tips for measuring current
• When measuring a 3-phase system, special
attention should be taken to the phase-
to-phase voltage which is significantly
higher than the phase-to ground voltage.
To avoid exceeding the voltage rating of
the protection fuse(s) accidentally, always
consider the phase-to-phase voltage as the
working voltage for the protection fuse(s).
• When measuring current, the meter’s
internal shunt resistors develop a voltage
across the meter’s terminals called “burden
voltage”. This voltage drop may affect
precision circuits or measurements.
Auto / Manual Range Operation
Press the RANGE button momentarily to
select manual-ranging voltage, resistence
and amperage measurement function, and
the meter will remain in the range it was in,
when the LCD annunciator
turns-off.
Press the button momentarily again to step
through the ranges. Press and hold the
RANGE button for 2 seconds to resume auto-
ranging.
Manual-ranging feature is not available in
Hz (Duty), CAP, Temp, and functions.
Auto - Power - Off
The Auto - Power - Off feature automatically
turns the meter off to extend battery life
after approximately 30 minutes of no
activity. To turn-on the meter after Auto-
Power-Off, turn the rotary switch from OFF
to any function (ON).
6. MAINTENANCE
WARNING: TO AVOID ELECTRICAL SHOCK OR
PERSONAL INJURY, REMOVE THE TEST LEADS
AND ANY INPUT SIGNALS BEFORE REPLACING THE
BATTERY OR FUSES. TO PREVENT DAMAGE OR
INJURY, INSTALL ONLY THE SAME TYPE OF FUSES
OR EQUIVALENTS.
Cleaning and Storage
Periodically wipe the case with a damp cloth
and mild detergent; do not use abrasives or