Atec T-R-DMO200 User Manual
DMO200
NEW
USB data
storage
All test results
can be stored
automatically on
a standard USB
memory key. The
unit has a real-
time clock to time
and date-stamp all
results. Results are
written to a CSV file
that can be opened
by any spreadsheet
program. A USB
keyboard is supplied to
add comments to
results.
Digital Micro-Ohmmeter
with USB data storage
A USB keyboard and 2Gb USB memory
key are supplied with the DMO200.
Test current presets
Programmable buttons to set test
currents. Set to 50A, 100A and
200A by default.
Universal supply
90-264V supply voltage with no
restriction on output current.
Comment
Press this button to enter a new
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comment on the keyboard.
Main Output
5V 1-200A pre-settable current.
Thermal and over-current
protection. <2.5% ripple.
mV Input
Sense input for 4 wire resistance
measurement.
Current clamp input
Connect the optional DC current
clamp to measure resistances
Optional Kelvin clamp lead set
Optional 200A Kelvin lead set-current injected
and sense voltage measured using one clamp.
with both sides earthed.
Optional current clamp
Optional extension lead sets
Optional output and sense extension lead sets
available in 3m, 5m and 10m lengths.
Standard lead set
High quality 3m 200A output leads
in carry case supplied with unit.
Colour
LCD
Simultaneous
display of
current, mV and
resistance.
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Example Applications
Busbar joint resistance
The DMO200 is ideal for measuring busbar joint resistance.
Before making connections ensure that the supply is off and
necessary earths have been applied. Connect the high current leads
to the busbar, ensuring that the joint resistance to be measured is
in the circuit. Connect the sense leads as close as possible to the
joint to be measured. Select the desired test current using one of
the preset test currents (or use the adjust knob to set a custom test
current). Switch the output on, and the current rises to the preset
current. Switch the output off again, and the reading is held on the
display.
Busbar
Circuit breaker contact resistance
The DMO200 is suited to all low resistance measurements on power
systems, and is particularly suited to measuring contact resistances
on substation circuit breakers, isolators and grounding equipment.
The unit has a powerful output capable of driving 200A through 20m
output leads to reach the contacts of even the largest circuit
breakers. Optional output lead extensions are available which
extend the high current and sense leads by 3, 5 or 10m.
Accurate measurements on circuit breakers, isolators and grounding
links with both sides earthed are simple with the optional current
clamp. This allows the current flowing through the earthing
equipment to be subtracted from the test current.
Busbar
Storing results
The DMO200 is supplied with a USB memory key and USB keyboard
for storing annotated results. To enter or edit a comment tap the
COMMENT/MENU button. The comment can then be edited using
the keyboard. This comment is stored with each result until a new
comment is entered. Each time the output of the unit is switched off
the readings from the unit are saved to the USB memory key in CSV
format along with the date, time and your comment.
The CSV file can be opened with any spreadsheet program such as
Microsoft Excel™ or OpenOffice Calc.
Details
Supply requirements: 90-265Vac 1300VA max
Output: 1-200Adc 5V
Resistance measurement: 0.1-5
DMO200 dimensions: 360 x 290 x 165mm
DMO200 weight: 6.9kg
Accessories supplied with unit: Mains lead, user manual,
3m high current leads, 3m sense leads, spare fuses.
Optional accessories
DMO200 current clamp Part no. A224-0001
3m Kelvin clamp lead set in plastic case Part no. A224-0003
Output/sense extension 3m in plastic case Part no. A224-0004
Output/sense extension 5m in plastic case Part no. A224-0005
Output/sense extension 10m in plastic case Part no. A224-0006
Note: Due to the company’s continuous research programme, the information above may change at any time without prior notification. Please check that you have the most recent data on the product.
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T&R Test Equipment Ltd, 15-16 Woodbridge Meadows, Guildford, Surrey, GU1 1BJ, UK
Tel: +44 (0)1483 207428 Fax: +44 (0)1483 511229 email: sales@trtest.com
www.trtest.com
DMO200 data sheet rev 0 23/06/10
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