Vanguard ATO-400 Micro Ohmmeter

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Vanguard ATO-400 Micro Ohmmeter
  • Application

  • The Vanguard ATO-400 Micro-Ohmmeter is specifically designed for sub-station applications to measure EHV circuit-breaker contact resistances, bushing contact joints, or any low resistance.
  • Key Features

  • Accurately measures low resistances from 1 μΩ to 300 mΩ
  • Outputs an un-filtered direct current from 10A to 400A to the DUT
  • Typical resistance burn-in time is 5 to 60 seconds, selectable
  • Review, print or export data in text or Excel format
  • Computer interface via RS-232C or USB port

Input Power 100 to 240 Vac 50/60 Hz
Resistance reading range 1 μΩ to 300 mΩ (1 μΩ resolution); Accuracy: ± 1% reading, ± 1 count
Test current range Thermally protected DC power supply, 10 A to 400 A, selectable in 1 A steps
Test duration 5 seconds to 60 seconds, selectable
Display Back-lit LCD Screen (20 characters by 4 lines); viewable in bright sunlight and low light levels
Keyboard Rugged membrane keypad (10 alpha-numeric keys, 6 function keys)
Internal test record storage Stores 63 records of up to 64 readings
Computer interfaces One RS-232C port, One USB port
PC software Windows software is included
Safety Designed to meet IEC61010 (1995), UL61010A-1, CSA-C22.2 standards
Environment Operating: -10°C to 50°C (15°F to 122°F); Storage: -30°C to 70°C (-22°F to 158°F)
Humidity 90% RH @ 40°C (104°F) non-condensing
Altitude 2,000m (6,562 ft) to full safety specifications
Cables 15-foot test cables, ground cable, power cord
Weight & dimensions Dimensions: (16.8W x 12.6H x 10.6D)in. (42.6 x 32.0 x 27)cm
Weight: less than 40 lbs (18.1 kg)
Options Transportation case, custom test cable lengths, C-clamps