6250 (obsolete)


Model 6250 [Catalog No. 2129.81] 10A Micro-Ohmmeter

—DISCONTINUED— Replaced by 6255


Model 6250 [Catalog No. 2129.81] 10A Micro-Ohmmeter

  • 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
  • EMF levels measured and
    eliminated in measurement
  • Two programmable alarm set points
  • Stores up to 1500 test results
  • Selectable Inductive or Resistive
    test modes
  • Large multi-line electroluminescent
Characteristics (cont’d) :
  • Automatic multiple test mode
    (multiple tests without pressing
    the test button)
  • 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
  • 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
  • Mechanical bond tests
Product Description:

The 10A Micro-Ohmmeter Model 6250 is a rugged, low resistance tester designed for both plant maintenance and field use. Utilizing a four-lead Kelvin method, the Model 6250 is the most accurate Micro-Ohmmeter available, with results within 0.05%.Resistance measurements are automatically calculated, taking into account the measurement value, ambient temperature, metal type and metal temperature co-efficient. Metal temperature can be manually entered by the operator or directly measured by the Model 6250 with an optional 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; resistive (instantaneous test), inductive (continuous test), and auto (repetitive test). Up to 1500 measurements can be stored and printed directly to a printer of from a PC.

  • 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
  • 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.
MODEL 6250
5.0000mΩ 0.05% + 0.5μΩ 0.1μΩ 10A
25.000mΩ 0.05%
+ 3μΩ
1μΩ 10A
250.00mΩ 0.05%
+ 30μΩ
10μΩ 10A
2500.0mΩ 0.05%
+ 0.3mΩ
0.1mΩ 1A
25.000Ω 0.05%
+ 3mΩ
1mΩ 100mA
250.00Ω 0.05%
+ 30mΩ
10mΩ 10mA
2500.0Ω 0.05%
+ 300mΩ
100mΩ 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
Correction Manual or Automatic with 0.1° resolution
Reference Programmable from 32° to 130°F or -10° to 130°C
Ambient Programmable from 32° to 130°F or -10° to 130°C
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 Bat. Indication is displayed when battery voltage is low
Memory Stores up to 1500 test resultsData in memory can be reviewed on the instrument display, on a PC or via direct printout
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 Type Large 50,000-count digital
Size 4 x 2.25″ (102 x 57mm)
Backlight Blue electroluminescent
Color Safety yellow case; gray faceplate
Interface Port PC, remote terminal, printer or trigger test from remote contact closure
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 Rating EN 61010-1, 50V Cat. III
Double Insulation Yes
CE Mark Yes
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