Atec Megger-DLRO10_DLRO10X - Manual (Page 2)

DLRO 10 AND DLRO 10X
Digital Microhmmeter
MEASUREMENT MODES:
A variety of measurement modes are available. Since the introduction
of V2.0 firmware, Normal, Auto, Continuous and Inductive mode are
available on both the DLRO 10 and the DLRO 10X.
DLRO 10 will display the average of the measurements achieved
using forward and reverse current, while DLRO 10X displays both
individual measurements and the average.
Normal mode initiates a test by pressing the Test button on the
instrument front panel after connecting the test leads. Continuity
of all four connections is checked, forward and reverse currents
are applied.
Auto mode allows forward and reverse current measurements to
be made and the average displayed simply by making contact with
all four probes. This mode is ideal when working with the supplied
handspikes. Each time the probes are removed and reconnected to
the load another test will be performed without the need to press
the test button on the instrument.
Continuous mode allows repeated measurements to be made
on the same sample. Simply connect the test leads and press the
test button. The measurement is updated every 3 seconds until the
circuit is broken.
Inductive mode is intended for use when measuring inductive
loads. When measuring inductive loads it is necessary to wait for
the voltage to stabilise. This means that the measurement could
take a few seconds or several minutes. The test leads are firmly
connected to the item to be measured and the Test button is
pressed. The instrument will pass a current through the sample
and wait for the voltage to stabilise. If possible the current will
be increased. This procedure will be repeated until the voltage
detected falls into the range 15 mV to 200 mV. The instrument will
then continue to take readings, which will gradually decrease to the
true value as the voltage stabilises further. The operator decides
when the result is stable and presses the test button to terminate
the test. Measurement is made with forward current only.
Unidirectional mode, on DLRO 10X only, applies a current in one
direction only. This does not enable any standing emfs to be negated
but speeds up the measurement process. Test starts automatically
when probes are connected.
APPLICATIONS
The needs for accurate low resistance measurement are well
known and very diverse. They range through Goods Receiving
inspection of components to ground bonding and welded joints.
Typical applications include, but are not limited to, making d.c.
resistance measurements of:
n
Switch and contact breaker resistance
n
Busbar and cable joints
n Aircraft frame bonds and static control circuits
n
Integrity of welded joints
n
Inter-cell connections on battery systems up to 600 V peak
n
Quality control of resistive components
n
Transformer and motor winding resistance
n Rail and pipe bonds
n
Metal alloys, welds and fuse resistance
n
Graphite electrodes and other composites
n Wire and cable resistance
n
Transmitter aerial and lightning conductor bonding
FEATURES AND BENEFITS
n Small, lightweight and portable - can be used in tight places,
reduces the need for extra long leads and two person operation.
n
Four terminal resistance method shows the true resistance of the
item under test.
n
Bright LED (DLRO 10) and LCD (DLRO 10X) displays are easily
visible under all lighting conditions and reduce human error.
n
Automatically applies forward and reverse currents which cancel
out any standing voltages across the sample under test.
n
Checks for undue noise during measurement, reducing the
possibility of recording the incorrect result.
n Automatically detects continuity in P and C circuits, preventing
erroneously high reading to be taken due to high resistance con-
tact.
n
Battery module has a battery condition indicator allowing the user
to check the state of spare batteries without connecting to the
instrument.
n RS232 connector on the DLRO 10X allows downloading of results
in real time or stored for later retrieval.