Measuring Ac Amperes; Measuring Dc Amperes - Urrea UD337 Manual De Usuario

E N G L I S H
is making a measurement. To disable
the auto power-off, press the ON-OFF
pushbutton (
if you press the ON-OFF pushbutton
again, the Meter turns OFF.
When you want to use this Meter
in manual range, press the RANGE
pushbutton, then this Meter is
in manual range. Press RANGE
pushbutton for 2 seconds to return to
Autoranging mode.

5.4 Measuring AC Amperes

When this meter has been powered
up, it defaults in the AC amperes
mode with 250-ms mea-surement
intervals (AC displayed) and auto
ranging mode (AUTO displayed),
which auto-matically selects the
proper range for both the bar scale
and the digital display.
Press the RANGE pushbutton to select
a fixed scale instead of autoranging.
Observe that each press alternates
between the 40A and 400A scales and
AUTO is no longer displayed. When
the reading is beyond the limits of
the digital display, for example, 40A
on a 40A scale, OFL appears on the
digital display.
Press the RANGE pushbutton for 2
seconds and than release in order
to return to autoranging mode. This
Meter acknowledges with a beep
sound and displays AUTO.

5.5 Measuring DC Amperes

28
is displayed), when
Press the AC-DC pushbutton to select
the DC amperes measurement mode
(AC disappeared on the LCD), but the
meter is still in the autoranging mode
(AUTO displayed), unless you press
the RANGE pushbutton to enter into
the manual ranging mode.
When the DC amperes measurement
mode is entered, the display reads
a non-Zero DC amperes (positive or
negative) value due to the presence
of the Earth's Magnetism. This value
is variable according to the location
measuring DC amperes.
Zero Adjustment by the
Microprocessor
To initiate the Zero Adjustment
procedure, press
pushbutton for 2 seconds. Then, the
meter beeps and the display reads
Zero just after the microprocessor
memorized the right preceding
display value that is used for
calculating the exact DC amperes
measurement value when measuring
the DC amperes of a current-carrying
conductor.
When measuring the DC amperes
of a current-carrying conductor, the
DC amperes value has a positive or
negative polarity according to the
direction of current-carrying. This
value is positive when the current
flows through the conductor in the
forward-moving direction of a righ-
thand threaded screw.
And it is negative when the currents
flows through the conductor in the
the HOLD