Megger DLRO200-EN Specifications
DLRO 200
Digital Microhmmeter
DLRO 200
Digital Microhmmeter
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Small and weighs less than 15 kg (33 lbs)
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Test currents from 10 A to 200 A d.c.
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0.1 µΩ best resolution
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On board memory for up to 300 test
results and notes
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RS232 port to download stored results or
for real time output to a printer
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Supplied complete with 5m (16.4 ft.) test
leads and download software
DESCRIPTION
Megger DLRO200 measures resistances between 0.1 µΩ and 1 Ω,
at high currents.
This versatile instrument can provide test currents from 10 amps
up to 200 amps subject to the load resistance and supply voltage.
A large liquid crystal display provides all the information needed
to perform a test; all test parameters and measurement results are
displayed.
The unique design allows the weight and size of DLRO200 to be
kept to a minimum; the instrument weighs less than 15 kg. This
small size makes DLRO200 equally at home in the workshop,on
the production floor or in the field. The high current capability
and compact design make DLRO200 suitable for testing circuit
breaker contacts, switch contacts, busbar joints or other
applications where high current is needed.
300 sets of results may be stored in DLRO200’s on board memory
for later download to a PC or may be output directly to a printer
via the RS232 port. You may also add notes to any stored result by
using the on board alphanumeric keypad, thereby making later
identification of results straightforward.
As well as adding notes to stored results, the alphanumeric keypad
allows you to set the test current directly by typing in the value
required. DLRO200 will check the continuity of the test circuit, and
will quickly ramp the test current up to the desired level. The keyboard is also used to set upper and lower limits for the result and to
prevent the use of excessive currents by setting an upper limit to
the allowable test current.
DLRO200 uses a four terminal measurement technique to cancel
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Smooth, continuous applied curent
eleminates magnetic transients capable of
inductively tripping breaker controls
(115 V version)
the resistance of the test leads from the measurement.
DLRO200 operates in one of three modes, which are simply
selected from the on screen menu.
CONTINUOUS mode is provided for users who wish to monitor a
resistance over a period of time. Connect the test leads, select the
test current and press the TEST button. DLRO200 will pass a current
continuously, and measure the resulting voltage at 2- second intervals,
until the test button is pressed to stop the test or the test circuit is
interrupted.
In NORMAL mode you connect the leads, select the test current and
press the TEST button. The test current will ramp up to the desired
level, hold for 2 seconds and then ramp down. The whole process
takes approximately 10 seconds.
In AUTO mode select the desired current, connect the current leads
and press the TEST button. The TEST lamp will flash to show that
the DLRO200 is ready to carry out a test. As soon as the potential
leads are connected, a test will start. To repeat a test, simply break
contact with the voltage probes and remake contac.
Measuring individual joints in a busbar is a good example of the
convenience to be gained by using AUTO mode. The two current
leads are connected to the ends of the busbar. They will remain
connected here until all tests have been completed. When the voltage
leads make contact across a joint, DLRO200 detects that all four
leads are connected, carries out a test and stops. When you move to
the next joint DLRO detects the new completed circuit automatically
and carries out the next test, and so on until all joints have been
tested. The results may be stored automatically and may be recalled
to the display or downloaded for review.
DLRO 200
Digital Microhmmeter
SPECIFICATIONS
Measurement:
Range: 0.1 µΩ to 999.9 mΩ
(Subject to supply voltage and leads used)
Accuracy:
Voltage ±0.5% ± 0.1 mV
Current ±0.5% ± 0.1 A
Resistance: Better than 1% from
300 µΩ to 100 mΩ
Better than ±2% from
100 µΩ to 300 µΩ
Current Lead Resistance (Megger supplied leads)
2 x 5 m 25 mm2 current leads 8 m
2 x 5 m 50 mm2 current leads 4 mΩ
2 x 10 m 70 mm2 current leads 5.4 mΩ
2 x 15 m 95 mm2 current leads 6 mΩ
Maximum Continuous Test Time
More than 10 minutes at 200 A @ 20 ºC ambient.
Power Supply for DLRO200
for full output (unsmoothed d.c.)
100 to 265 V 50/60 Hz with a load
less than 19 mΩ (supply >207 V rms), or
11 mΩ (115 V rms) including current leads
Power Supply for DLRO200-115 V
for full output (additional smoothing)
100 to 130 V 50/60 Hz with a load
less than 11 mΩ including current leads
Test Modes: Manual, Auto, Continuous.
Test Time: 10 seconds NORMAL /AUTO mode.
Refreshed every 2 seconds in CONTINUOUS
mode
Display: Large, high resolution backlit liquid crystal
display
Warnings Current flowing: - LED. Other warnings are
shown on the lcd display
Data Transfer Real time or batch download via RS232
using Download Manager.
Storage Capacity:
300 result sets and memo, battery backed for
10 years.
Memo field: 160 characters max.
Max. Humidity: 95% RH non-condensing
Maxi Altitude: 2000 m
Safety: IEC61010-1
EMC: IEC61326-1
Dimensions: 410 x 250 x 270 mm
(16.4 x 9.84 x 10.63 ins)
Weight: 14.5 kg (excluding test leads)
(31.97 lbs)
Test Current
Range: 10 A to 200 A d.c. *
Accuracy: ±2% ±2 A
Voltmeter input
impedance: >200 kΩ
Hum rejection: 5 V rms 50 Hz/60 Hz
Temperature
Operation: -10 to +50 ºC (-14 to +122 ºF)
Storage: -25 to +65 ºC (-13 to 149 ºF)
Calibration: 20 ºC
Co-efficient: <0.05% per ºC
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