• Megger

Megger® Model DLRO 10

Digital Low-Resistance Ohmmeter



  • Accurate results in under three seconds
  • 0.2% basic accuracy
  • Auto current reversal cancels standing emfs
  • Fuse protected to 600 V
  • NiMH battery reduces weight
  • 250 mW power limit (with optional override) to avoid heating the test sample
  • Automatically detects continuity in potential and current connections
  • Visible warning of high voltages present at the terminals
  • Visible warning of current flowing in the test sample
  • Multiple operating modes including fully automatic

Small, lightweight and portable — can be used in tight places, reduces the need for extra long leads and twoperson operation.

Four-terminal resistance method shows the true resistance of the item under test.

Bright LED (DLRO10) and LCD (DLRO10X) displays are easily visible under all lighting conditions and reduces human error.

Automatically applies forward and reverse currents which cancels out any standing voltages across the sample under test.

Checks for undue noise during measurement reducing the possibility of recording the incorrect result.

Automatically detects continuity in P and C circuits, preventing erroneously high readings to be taken due to high resistance contact.

Battery module features smart charging circuit, reducing accidental damage and cost.

Battery module has a battery condition indicator allowing the user to check the state of spare batteries without connecting to the instrument.

RS232 connector on the DLRO10X allows downloading of results in real time or stored for later retrieval.


The DLRO10 is probably the smallest, lightest, quickest 10A micro-ohmmeter available.

The needs for accurate low resistance measurement are well known and very diverse. They range through receiving, inspection of components to ground bonding and welded joints. Typical end users include utilities, telecom, railroads, aviation, manufacturing facilities, and process control plants.

IIII [+] Read More


DC resistance measurements for the following & more:

  • Switch and contact breaker resistance
  • Busbar and cable joints
  • Aircraft frame bonds and static control circuits
  • Integrity of welded joints
  • Intercell strap connections on battery systems up to 600 V peak
  • Quality control of resistive components
  • Small transformer and motor winding resistance
  • Rail and pipe bonds
  • Metal alloys welds and fuse resistance
  • Graphite electrodes and other composites
  • Wire and cable resistance
  • Transmitter aerial and lightning conductor bonding
  • Literature
  • Specifications
pdf icon Description
++ DLRO10 Specification sheet (1.6 MB)
Full Scale Resolution Accuracy Volts (full scale) Test Current
1.9999 mΩ 0.1 μΩ ± 0.2% ± 0.2 μΩ 20 mV 10 A
19.999 mΩ 1 μΩ ± 0.2% ± 2 μΩ 20 mV 1 A
199.99 mΩ 10 μΩ ± 0.2% 20 μΩ 20 mV 100 mA
1.9999 Ω 100 μΩ ± 0.2% 0.2 mΩ 20 mV 10 mA
19.999 Ω 1 mΩ ± 0.2% ± 2 mΩ 20 mV 1 mA
199.99 Ω 10 mΩ ± 0.2% 20 mΩ 20 mV 100 μA
1999.9 Ω 100 mΩ ± 0.2% ± 0.2 Ω 200 mV 100 μA
Mode Manual, Auto, Continuous, High Power
Control Fully automatic
Speed <3 s for forward and reverse current and to display average
Measurement 4-1/2 digit seven segment LED
Range and Safety
LED indication
Test Current

Test current < 10 mA: better than 10 ppm per second

Test current > 10 mA: better than 100 ppm per second

Voltmeter InputImpedance
Greater than 200 kΩ
Hum Rejection
Less than 1% + 20 digits additional error with 100 mV rms 50/60 Hz on potential leads.
If this level is exceeded, a warning will illuminate on the front panel.
7 Ah NiMH rechargeable battery supplied with instrument
Typically 1000 x 10 A tests
External 115/230 V 50/60 Hz charger (supplied) or from 12 V car battery
Charging Rate Standard
2-1/2 hours to 90% capacity at 68o F (20o C)

41o to 113° F (+5° to +45° C) at full specification

14o to 122° F (-10° to +50° C) at reduced accuracy

-4° to 158° F (-20° to +70° C)
68° F (20° C)

<0.006% per °F over range 41o to 104° F

(<0.01% per °C over range 5° to 40° C)

Slow charge
32° F to 113° F (0° C to +45° C)
Standard charge
50° to 113° F (+10° to +45° C)
Humidity (max)
90% RH @ 104° F (40° C) non-condensing
Altitude (max)
6562 ft (2000 m) to full safety specifications
In accordance with EN61010-1 600 V Category III
Meets EN50081-1 and EN50082-1 (1992)
8.6 x 4 x 9.5 in. (220 x 100 x 237 mm)
5.7 lb (2.6 kg) including battery module