Megger DLRO10HD Dual Power 10A Low Resistance Ohmmeter
Equally at home in the laboratory, the workshop or in the field, on the bench or on the ground, Megger’s new heavy duty DLRO10HD low resistance ohmmeter combines rugged construction with accuracy and ease of use. It features an internal rechargeable battery and can also operate from a mains supply, even if the battery is completely flat.
• High or low output power selection for condition diagnosis
• Rechargeable battery or line power supply, continuous operation, even with dead battery
• 10 A for 60 seconds, less time waiting to cool, great for charging inductance
• High input protection to 600 V, inadvertent connection to line or UPS voltage will not blow a fuse
• Heavy duty case: IP 65 lid closed, IP54 operational (battery operation only)
• Rotary switch selects one of five test modes, including auto start on connection, giving ease of use
|Test Current||Resistance Range||Resolution
|Basic Accuracy*||Full Scale Voltage||Max Power Output|
|0.1 Ω||±0.2%||25 mV||25 μW|
|0.01 Ω||±0.2%||25 mV||2.5 μW|
|1 mΩ||±0.2%||25 mV||25 μW|
|0.1 mΩ||±0.2%||25 mV||250 μW|
|0.01 mΩ||±0.2%||25 mV||2.5 μW|
|1 μΩ||±0.2%||25 mV||25 mW|
|0.1 μΩ||±0.2%||25 mV||0.25 W|
|0.1 mΩ||±0.2%||2.5 V||2.5W|
|0.01 mΩ||±0.2%||2.5 V||25W|
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 measurement is displayed.
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.
Automatic unidirectional mode applies current in one direction only to speed up the measurement process. However thermal EMF resulting from dissimilar metal bonds can cause lower accuracy. Test starts automatically when probes are connected.
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 three seconds until the circuit is broken.
Inductive mode is selected when measuring resistance on, for example, motors and generators. When measuring inductive loads it is necessary to wait for the voltage to stabilise as the inductive element is charged. Test leads are firmly connected to the device under test and the ‘Test’button pressed. The instrument will pass the selected current through the sample continuously in one direction only and take repetitive readings that will gradually decrease to the true value as the voltage stabilises. The operator decides when the result is stable and presses the ‘Test’button to terminate the test.
|Megger DLRO10HD Dual Power 10A Low Resistance Ohmmeter|
|Temperature Coefficient||< 0.01% per ºC, from 5 ºC to 40 ºC|
|Maximum Altitude||2000m (6562 ft) to full safety specifications|
|Display Size/Type||Main 5 digit + 2 x 5 digit secondary displays|
|Battery Type||6 V, 7Ah sealed lead acid|
|Voltage Input Range||90 - 264 V, 50-60 Hz|
|Charge Time||8 Hours|
|Battery Life||>1000 Auto (3 sec) tests|
|Auto Power Down||300s|
|Mode Selection||Rotary switch|
|Range Selection||Rotary switch|
|Case Dimensions||L315 mm x W285 mm x H181 mm|
|Pouch for Test Leads||Yes (lid mounted)|
|Test Leads||DH4 lead set included|
|IP Rating||IP65 case closed, IP54 battery operation|
|Safety Rating||In accordance with IEC61010-1, CATIII 300V when used with optional terminal cover (details in ordering information)|
|Operating Temp/Humidity||-10 °C to +50 °C
(14 °F to 122 °F) <90% RH
|Reference Conditions||20 °C ±3 °C|
|Storage Temp/Humidity||-25 °C to +60 °C, <90% RH|
|EMC||In accordance with IEC61326-1 (Heavy industrial)|
|Noise Rejection||Less than 1% ±20 digits additional error with 100 mV peak 50/60 Hz. on the potential leads. Warning will show if hum or noise exceeds this level.|
|Maximum Lead Resistance||100 mΩ total for 10 A operation irrespective of battery condition.|
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