Cropico DO4A

Portable digital ohmmeter

  • True 4 wire measurement eliminates lead resistance errors
  • 6 push button ranges 40 milli ohm… 4 kilo ohm with long scale length
  • 10 micro ohm resolution on 40 milli ohm range
  • Input protection up to 415 Volts rms
Cropico DO4A

Cropico DO4A

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The Cropico DO4A 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 aluminum case with tilt handle.

The Cropico DO4A has many advanced features, including protection up to 415 volts rms, digital calibration and long scale length (4000 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 while charging.

For ease of operation the control functions have been kept to a minimum and are clearly marked. Direct reading warning LEDs illuminate when an open circuit lead condition is detected. Over range and low battery indication is also provided.

The Cropico DO4A is supplied ready for immediate use with battery, mains power cord and measuring leads, no extras are normally necessary.

The 15mm LCD provides easy viewing and the instrument can be used in any position for many and varied applications. The test leads provided have a length of 1 meter with spade tags for connection to the ohmmeter terminals. They are terminated in combined current and potential probes that will accept conductor diameters up to 0.24in.

Cropico DO4A

to Request a Quote

 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



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