DLRO 200-115
Digital Low Resistance Ohmmeter
DLRO 200-115
Digital Low Resistance Ohmmeter
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Small and weighs less than 32 lbs (14.5kg)
Test currents from 10 A to 200 A d.c.
Filtered direct current output eliminates
magnetic transients
0.1 µΩ best resolution
On board memory for up to 300 test
results and notes
RS232 port to download stored results
or for real time output to a printer
Supplied complete with 16 ft. (5m)
test leads and download software
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DESCRIPTION
The DLRO200-115 is designed to check and measure contact
resistance in high voltage circuit breakers, disconnecting
switches (isolators), busbar joints, or for any low resistance
measurement. The test set accurately measure resistances
ranging from 0.1µΩ to 1Ω, 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. For those applications that demand a
smooth dc current, the DLRO200-115 has extra filtering on
the output to reduce mains frequency ripple and can drive
200 amps through a total current loop resistance of
11 milliohms. The filtered output of the DLRO200-115 also
eliminates magnetic transients that could inductively trip a
breaker’s control (bus differential relay), if left in the test
circuit.
The unique design allows the weight and size of the
DLRO200-115 to be kept to a minimum; the instrument
weighs less than 32 lbs. (14.5 kg). This small size plus a
water/dust ingress rating of IP54 makes the test set equally
at home in the workshop, on the production floor or in the
field.
As many as 300 sets of results may be stored in the test set’s
on-board memory for later download to a PC or may be sent
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 easier to determine.
As well as adding notes to stored results, the alphanumeric
keypad allows you to set the test current directly by keying
in the value required. The DLRO200-115 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.
The DLRO200-115 uses a four terminal measurement
technique to cancel the resistance of the test leads from the
measurement.
The test set 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. The
DLRO200-115 will pass a current continuously, and measure
the load resistance 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 DLRO200-115 is ready to carry out
a test. As soon as the potential leads are connected, a test
DLRO 200-115
Digital Low Resistance Ohmmeter
will start. To repeat a test, simply break contact with the
voltage probes and remake contact.
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 there until all tests have been
completed. When the voltage leads make contact across a
joint, the DLRO200-115 detects that all four leads are
connected, carries out a test and stops. When you move to
the next joint the DLRO200-115 detects the already
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.
Test Modes:
Test Time:
Manual, Auto, Continuous.
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.
Test Current
Range:
Accuracy:
Voltmeter input
impedance:
Hum rejection:
Temperature
Operation:
Storage:
Calibration:
Co-efficient:
Max. Humidity:
Maxi Altitude:
Safety:
Filtered direct current; 10 A to 200 A d.c.
±2% ±2 A
>200 kΩ
5 V rms 50 Hz/60 Hz
SPECIFICATIONS
Measurement:
Range:
0.1 µΩ to 999.9 mΩ
(Subject to supply voltage and leads used)
Accuracy:
Voltage:
Current:
±0.5% ± 0.1 mV
±0.5% ± 0.1 A
Resistance: Better than 1% from
100 µΩ to 100 mΩ
Current Lead Resistance (Megger supplied leads)
2 x 16 ft (5 m) 25 mm
2
current leads
8 mΩ
2 x 16 ft (5 m) 50 mm
2
current leads
2 x 33 ft (10 m) 70 mm
2
current leads
2 x 49 ft (15 m) 95 mm
2
current leads
4 mΩ
5.4 mΩ
6 mΩ
14 to +122º F (-10 to +50º C)
-13 to 149º F (-25 to +65º C)
68° F (20º C)
<0.05% per º C
95% RH non-condensing
6562 ft. (2000 m)
IEC61010 – (1995)
EN61326 annex A (heavy industrial)
16.4 x 9.84 x 10.63 in.
(410 x 250 x 270 mm)
31.97 lbs. (14.5 kg) excluding test leads
EMC:
Dimensions:
Maximum Continuous Test Time
More than 10 minutes at 200 A @ 68° F (20º C) ambient.
Power Supply
for full output (additional smoothed):
100 to 130 V 50/60 HZ with a load
less than 11 mΩ including current leads
Weight:
ORDERING INFORMATION
Item (Qty)
Cat No.
Item (Qty)
Optional Accessories at extra cost
16 ft. (5m) Lead set in bag comprising:
2 x 50mm
2
current leads with clamps and
2 x potential leads with clips
49 ft. (15m) Lead set comprising 2 x 95 mm
2
current leads with clamps and
2 x potential leads with clips
33 ft. (10m) Lead set comprising 2 x 70 mm
2
current leads with clamps and
2 x potential leads with clips
Transport case
6220-757
Cat No.
6220-755
DLRO200-115 High Current Digital Low Resistance Ohmmeter
DLRO200-115 E
115 V (English QWERTY keyboard)
Included Accessories
16 ft. (5 m) Lead set comprising 2 x 25 mm
2
current leads with clips and 2 potential
leads with clips
Download Manager
User Guide on CD-ROM
RS232 download cable
Quick Start Guide (English)
6220-787
6111-442
6172-763
25955-025
6172-782
6220-756
MC996
UK
Archcliffe Road, Dover
CT17 9EN England
T +44 (0) 1 304 502101
F +44 (0) 1 304 207342
UKsales@megger.com
UNITED STATES
4271 Bronze Way
Dallas, TX 75237-1019 USA
T 1 800 723 2861 (USA only)
T +1 214 333 3201
F +1 214 331 7399
USsales@megger.com
OTHER TECHNICAL SALES OFFICES
Täby SWEDEN, Norristown USA,
Sydney AUSTRALIA, Toronto CANADA,
Trappes FRANCE, Kingdom of
BAHRAIN, Mumbai INDIA,
Johannesburg SOUTH AFRICA, and
Chonburi THAILAND
Registered to ISO 9001:2000 Reg no. Q 09290
Registered to ISO 14001 Reg no. EMS 61597
DLRO200-115_DS_en_V04
www.megger.com
Megger is a registered trademark
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