Datasheet

ManualsBrandsMegger ManualsComponent Testing InstrumentsOhmmeter, 250mOhm ... 2.5kOhm

n High or low output power selection for

condition diagnosis

n Rechargeable battery or line power supply,

continuous operation, even with dead

battery

n 10 A for 60 seconds, less time waiting to

cool, great for charging inductance

n High input protection to 600 V, inadvertent

connection to line or UPS voltage will not

blow a fuse

n Heavy duty case: IP 65 lid closed, IP54

operational (battery operation only)

n Rotary switch selects one of ﬁve test

modes, including auto start on connection,

giving ease of use

DLRO10HD

10 A Digital Low Resistance Ohmmeter

DLRO10HD

10 Amp Digital Low Resistance

DESCRIPTION

Augmenting Megger’s DLRO10 and 10X range the

DLRO10HD combines ultimate simplicity of operation with

a rugged IP65 case designed for stable ground and bench

operation.

The unit is powered from either its rechargeable battery or

line power making it suitable for continuous testing in

production line/repetitive use environments.

Rotary switch controls are simple and easy to operate in all

weather conditions and with gloved hands. A large, clear,

backlit LCD display is easy to read from a distance. The

DLRO10HD provides signiﬁcantly enhanced compliance

and is capable of delivering 10 A into measurements up to

250 mΩ and 1 A into measurements up to 2.5 Ω. The

duration of each test may be up to 60 seconds.

The DLRO10HD is rated CATIII 300 V provided the

optional terminal cover is ﬁtted to the instrument. Details

of which can be found in the ordering information panel of

this data sheet.

The DLRO10HD provides ﬁve test modes each of which is

selected through a simple rotary control.

ADDITONAL FEATURES AND BENEFITS

n Rugged case well suited to transportation with shoulder

strap and lead set pouch

n Removable lid facilitates easy test lead connection

n Operational ingress protection is IP 54 (battery power

only) ensuring protection from the elements

n 7Ah lead acid battery provides extended operation and

can be charged whilst operating from line power

n Rotary mode switch with bidirectional (current reversal

with averaging cancels thermal EMFs), unidirectional,

automatic, continuous and inductive modes

n Large, clear LCD display with backlight and contrast

adjustment

n Auto power off function conserves battery

APPLICATIONS

The DLRO10HD measures low resistance values in

applications ranging from railways and aircraft to resistance

of components in industry.

Any metallic joint can be measured but users must be aware

of measurement limitations depending on application. For

example, if a cable manufacturer plans to make resistive

measurements on a thin wire, a low test current should be

selected to prevent heating the wire thereby changing its

resistance.

Measurements on electric motors and generators will

be inductive and require the user to understand the

inductive mode and charging process before a correct result

is achieved.

The DLRO10HD is well suited to measuring thick conductors,

bonds and quality of welding because of its 10 A range for

resistance values up to 250 mΩ.

Electromagnetic noise induced into the leads can interfere

with a reading. A noise symbol alerts the user and prevents

a measurement when the instrument detects noise above its

threshold.

When dissimilar metals are joined a thermocouple effect is

created. Users should select a bidirectional mode to ensure

cancellation of this effect. The instrument measures with

current ﬂowing in both directions and averages the result.

Normal mode is initiated by pressing the ‘Test’ button after

connecting the test leads to the unit under test. Continuity of

all four connections is checked. Current is applied in both

forward and reverse direction following which measure-

ment is displayed.

Summary of content (3 pages)

PAGE 1
DLRO10HD 10 A Digital Low Resistance Ohmmeter DLRO10HD 10 Amp Digital Low Resistance n High or low output power selection for condition diagnosis n Rechargeable battery or line power supply, continuous operation, even with dead battery n 10 A for 60 seconds, less time waiting to cool, great for charging inductance n High input protection to 600 V, inadvertent connection to line or UPS voltage will not blow a fuse n Heavy duty case: IP 65 lid closed, IP54 operational (battery operation only) n Rota
PAGE 2
DLRO10HD 10 A Digital Low Resistance Ohmmeter Automatic mode is started as soon as the probes make contact. Forward and reverse current measurements are made and the average value is displayed. This mode is ideal when working with the supplied DH4 handspikes. Each time the probes are removed and reconnected to the load a new test will be performed without the need to press the test button. TEST modes Automatic unidirectional mode applies current in one direction only to speed up the measurement process.
PAGE 3
DLRO10HD 10 A Digital Low Resistance Ohmmeter OPTIONAL TERMINAL COVER The CATIII 300 V rating on the DLRO10HD is only valid when the instrument is fitted with the optional terminal cover to provide the required creepage and clearances at the instrument terminals. Although the terminal cover may be used with any test leads, only the Megger DH4 and DH5 duplex handspikes have suitable probe insulation to comply with the requirements of IEC61010-1 and the CATIII 300 V rating.