Seaward Cropico – DO4A Portable digital ohmmeter with 415V protection

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Categories: , Brand: Seaward


This portable digital ohmmeter is a practical instrument for low resistance measurement, ideal for use in the workshop, field or test facilities. It is of rugged construction contained in an aluminium case with tilt handle.

The DO4A has many advanced features, including protection up to 415 volts rms, digital calibration and long scale length, 4,000 count. The rechargeable sealed lead acid battery means real portability with more than 14 hours continuous operation, without the problems normally associated with other battery types. Full measurement capability is maintained whilst charging.

  • Digital bench Millio-ohmmeter with True 4 wire measurement eliminates lead resistance errors
  • 6 Push button ranges from 40 milli-ohms to 4kilo-ohm with long scale length
  • 10μΩ resolution on 40m Ω range
  • Rechargeable battery with 14 hours continuous operation
  • Input protection up to 415 volts rms
  • Zero control thermal E.M.F. compensation
  • Digital calibration
  • Mains/rechargeable battery operation
  • Open circuit lead warning
  • Rugged construction with aluminium case

Technical specification

Measurement 4 Terminal Kelvin/Thomson principle eliminates error due to lead resistance. Open circuit measurement voltage approx. 5V dc.
Display 15mm LCD 4,000 count with automatic decimal point and polarity indication.
Ranges 6 Push button selected with LED indication
Auto Zero Permits the automatic zero of amplifiers and external circuits eliminating errors due to thermal emf.
Calibration Digital, security key protected
Protection 415 rms maximum at input terminals
Battery 6 Volt 2.8 Ah sealed lead acid, replaceable. Operating Time: 14 hours typical on bottom range, 28 hours typical on other ranges. Internal charger with automatic switch-off to prevent deep discharge.
Executive Lead Pack This lead pack consists of four test leads, 1 metre long, with 4mm banana plugs, 4 crocodile clips, 4 test prods and 2 Kelvin Clips (combined current and potential clips).
Terminals 4mm binding posts accept spade tags and 4mm banana plugs
Terminals 4mm safety sockets
Working Temp 0…40°C rel. humidity 80% max. non-condensing
Storage Temp -20 … +50°C
Mains Supply 100/120/220/240 Volts +10% -13%. 47 … 63Hz. 20VA
Safety IEC 348 Protective Class 1
Dimensions 215 x 250 x 88mm (W D H): 1/2 19″ rack. 2U high (467 x 374 x 216mm packed in card carton)
Mass 3.5kg (4.5kg packed in card carton)
Accessories Supplied complete with mains cord, measuring leads with Kelvin Clips, handbook and certificate of conformity