Atec AEMC-6250 User Manual

10A Micro-Ohmmeter
Model 6250

The 10A Micro-Ohmmeter Model 6250
is a rugged, low resistance tester
designed for plant maintenance,
quality control in manufacturing and
field use. Utilizing a four-lead Kelvin
method of testing, the Model 6250
is one of the more accurate Micro­Ohmmeters available, with results
within 0.05% accuracy.

Resistance measurements are
automatically calculated and
displayed, taking into account the
measurement value, ambient
temperature, reference temperature
and metal temperature coefficient.
Sample temperature can be manually
entered by the operator or directly
measured by the Model 6250 with
an external RTD temperature probe.

The Model 6250 is uniquely designed
to conduct tests on both resistive and
inductive material, with operator
selection directly from the front panel.
Three test modes are available and
automatically employed based on
this selection:

Resistive materials (i.e. ground
bonding, coatings, contact resistances)
are tested with an instantaneous test.
Simply press the test button – the
reading is taken and the test is
concluded.

Inductive materials (i.e. coils, trans­formers, motor windings) are tested
with a continuous test. The test is
started and stopped by the operator
at the push of a button.

Auto test mode is designed for
multiple test points on resistive and/or
low inductance material. The test is
started at the press of a button. As the
operator moves the probe from one
point to another, the test is stopped,
the results are displayed and a new
test is started when the test probes
again make contact – no need to
press the test button! Residual voltage
is measured between tests to ensure
proper results. This test mode
continues until the operator presses
the button to conclude the testing.

The large, easy-to-read display shows
the resistance measurement, ambient
and reference temperatures, metal
type and test method, as well as alarm
conditions and memory utilization, all
in real time. Previously stored test
results can easily be called up for
review on the display or sent directly
to a printer or remote terminal.

Two programmable alarm set points
are available. Each can be either
active high or low and will sound an
alarm when tripped, further adding to
the ease of use by permitting quick
Pass/Fail measurements.

External trigger operation is available
through the communication port
allowing the test to be conducted
from a remote location.

The list of features and functions goes
on and on. The Model 6250 will be a
valuable asset for your bond testing,
coil and contact testing as well as
coatings and connector or any other
low resistance testing application.

10A Micro-Ohmmeter Model 6250 (pdf) Rev. 04 0306

Technical Assistance [phone] www.aemc.com1of 5

10A Micro-Ohmmeter Model 6250 (pdf) Rev. 04 0306

Technical Assistance [phone] www.aemc.com

2

of 5

Features

• Measure from 0.0001mΩ

(0.1μΩ resolution) to 2500.0Ω

• Test current selection of 1mA, 10mA,

100mA, 1A and 10A

• RTD temperature probe to check

tested sample (optional)

• Selectable metal types

• Automatic and manual temperature

correction

• EMF levels measured and

eliminated in measurement

• Two programmable alarm set points

• Stores up to 1500 test results

• Selectable Inductive or Resistive

test modes

• Automatic multiple test mode

(multiple tests without pressing
the test button)

• Large multi-line electroluminescent

display

• Local or remote test setup and control

• Direct printout

• Internal rechargeable batteries –

conduct up to 5000 10A tests

• Rugged, double insulated

waterproof case

• CE Mark

Applications

• Aerospace metallic coating

resistance measurement

• Winding resistance measurement

of motors and transformers

• Bonding verification on earth/

ground systems

• Weld joint integrity verification

• Contact resistance measurement

of breakers and switchgear

• Aircraft and rail bonding checks

• Wire to terminal connections

and resistance checks

• Battery strap resistance checks

• Cable joint and bus bar connection

checks

• Mechanical bond tests

Verifying rail bonds with the Model 6250

Report printouts of the current measurement or any
measurement stored in memory is quick and easy.
Connect the printer to the interface port and press the
PRINT button – it’s that simple. All measurement results
are printed.

MODEL 6250

ELECTRICAL

Range 5.0000mΩ 25.000mΩ 250.00mΩ 2500.0mΩ 25.000Ω 250.00Ω 2500.0Ω
Accuracy 0.05% 0.05% 0.05% 0.05% 0.05% 0.05% 0.05% +

+ 0.5μΩ + 3μΩ + 30μΩ + 0.3mΩ + 3mΩ + 30mΩ 300mΩ

Resolution 0.1μΩ 1μΩ 10μΩ 0.1mΩ 1mΩ 10mΩ 100mΩ
Test Current 10A 10A 10A 1A 100mA 10mA 1mA
Measurement Mode Selectable: Inductive (continuous test), Resistive (instantaneous test) or Auto (multiple tests)
Metal Type Selectable: Copper, Aluminum or Other Metal

Alpha Programmable from 000.00 to 99.99

Temperature Correction Manual or Automatic with 0.1° resolution

Reference Temperature Programmable from 32° to 130°F or -10° to 130°C
Ambient Temperature Programmable from 32° to 130°F or -10° to 130°C

Temperature Probe 100Ω platinum RTD

Resolution

±0.1°F (0.1°C)

Accuracy ±0.9°F (±0.5°C)

Alarms Two – programmable set points from 0.0 to 2500.0Ω
Buzzer Programmable ON/OFF and volume level
Power Source Rechargeable 6V, 8.5 Ah NiMH batteries;
Battery Life Approximately 5000 10A tests
Battery Charging 120/240VAC ± 20% (45 to 400Hz) line voltage
Power Management Display powers down after 1, 5 or 10 minutes of inactivity (operator selectable)
Low Battery Indication is displayed when battery voltage is low
Memory Stores up to 1500 test results

Data in memory can be reviewed on the instrument display, on a PC or via direct printout

MECHANICAL

Dimensions 10.63 x 9.84 x 7.09" (270 x 250 x 180mm)
Weight 8.1 lbs (3.69kg)
Index of Protection IP53 (case open); IP64 (case closed)

DISPLAY

Display Type Large 50,000-count digital
Size 4 x 2.25" (102 x 57mm)
Backlight Blue electroluminescent
Color Safety yellow case; gray faceplate

COMMUNICATION

Interface Port PC, remote terminal, printer or trigger test from remote contact closure

ENVIRONMENTAL

Operating Temperature 14° to 132°F (-10° to 55°C); 10 to 80% RH (non-condensing)
Storage Temperature -40° to 140°F (-40° to 60°C)

SAFETY

Safety Rating EN 61010-1, 50V Cat. III
Double Insulation Yes
CE Mark Yes

10A Micro-Ohmmeter Model 6250 (pdf) Rev. 04 0306

Technical Assistance [phone] www.aemc.com

3

of 5

Specifications

10A Micro-Ohmmeter Model 6250 (pdf) Rev. 04 0306

Technical Assistance [phone] www.aemc.com

4

of 5

Construction

Kelvin clips, set of two,

(1A) 10 ft Catalog #1017.83

Kelvin clips, set of two,

(10A) 10 ft Catalog #1017.84

RTD Temperature Probe
with 7 ft extension cable

Catalog #2129.96

Rotary selection switch

Large multi-line backlit
liquid crystal display

Communication/
remote operation port

RTD temperature input

Start/Stop button

Eight function buttons

AC line

recharging receptacle

Kelvin

terminals

Functional Display

Resistance measurement

Test in process

Measurement units

Reference temperature

Metal type (Copper)

Test current

Measurement range

Temperature correction active

Alarm 1 HIGH set point active

Buzzer active

Accessories

Test mode (Inductive)

Test mode (Resistive)

Standby

Kelvin probes, set of two,

spring loaded
(10A) 10 ft Catalog #1017.82
(1A) 20 ft Catalog #2118.52

ORDERING INFORMATION CATALOG NO.

10A Micro-Ohmmeter Model 6250 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #2129.81

Includes NiMH rechargeable 6V battery pack, set of two Kelvin clips (10A) 10 ft, US 120V power cord,
carrying bag and user manual

Accessories (Optional)

Kelvin Probes (10A), set of two, spring loaded, 10 ft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #1017.82

Kelvin Clips (1A), set of two, 10 ft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #1017.83

Kelvin Clips (10A), set of two, 10 ft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #1017.84

Kelvin Probes (1A), set of two, spring loaded, 20 ft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #2118.52

RTD Temperature Probe (plug into faceplate for ambient temperature) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #2129.95

RTD Temperature Probe with 7 ft extension cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #2129.96

10A Micro-Ohmmeter Model 6250 (pdf) Rev. 04 0306

Technical Assistance [phone] www.aemc.com

5

of 5

Contact Us

United States & Canada:

Chauvin Arnoux

®

, Inc.

d.b.a. AEMC

®

Instruments
200 Foxborough Blvd.
Foxborough, MA 02035 USA
[phone] • Fax [phone]
www.aemc.com

Customer Support – for placing an order, obtaining price & delivery:

[e-mail]

Sales Department – for general sales information:

[e-mail]

Repair and Calibration Service – for information on repair & calibration, obtaining a user manual:

[e-mail]

Technical and Product Application Support – for technical and application support:

[e-mail]

Webmaster – for information regarding www.aemc.com:

[e-mail]

South America, Central America, Mexico, Caribbean, Australia & New Zealand:

Chauvin Arnoux

®

, Inc.

d.b.a. AEMC

®

Instruments
15 Faraday Drive
Dover, NH 03820 USA
[phone] • Fax [phone]
[e-mail]
www.aemc.com

All other countries:

Chauvin Arnoux SCA
190, rue Championnet
75876 Paris Cedex 18, France
33 1 44 85 45 28 • Fax [phone]
[e-mail]
www.chauvin-arnoux.com