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Cropico DO4A Portable Milliohmmeter
  • Cropico DO4A Portable Milliohmmeter
  • Cropico DO4A Portable Milliohmmeter

Cropico DO4A Portable Milliohmmeter

Cropico authorised distributor and service centre.

Includes: mains cord, measuring leads with Kelvin Clips, handbook and certificate of conformity.

£1,080.00 Save £144.00
Tax excluded
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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 Cropico 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.

Simple push button selection of the range required ensures the DO4A may be easily used by unskilled personnel, error and status warnings are illuminated when appropriate. The utmost care has been used to ensure that the ohmmeter will withstand an accidental mains voltage applied to the measuring terminals, but it is not recommended that voltage should be applied.

The measurement is true 4 terminal, using the Kelvin principle. A stable current is produced across the resistance to be measured via the C terminals, and the voltage drop across the Rx is measured at the P terminals. This potential drop is then compared against the voltage drop across internal standards, the ratio of these is then converted to the resistance value of Rx and displayed in ohms on the digital display.


True 4 wire measurement eliminates lead resistance errors.
6 push button ranges 40mΩ - 4kΩ with long scale length.
10μΩ resolution on 40mΩ range.
Input protection up to 415Vrms.
Zero control thermal E.M.F. compensation.
Digital calibration.
Mains/rechargeable battery operation.
Open circuit lead warning.
Rugged industrial maintenance free design.

Cropico DO4a Specifications
Range Resolution Typical Current Accuracy @20°C ±5°C 1 Year Temperature Coefficient (°C)
4kΩ 100μA ±(0.05% Rdg + 0.02% FS) 30ppm Rdg + 1ppm FS
400Ω 100Ω 1mA ±(0.05% Rdg + 0.02% FS) 30ppm Rdg + 1ppm FS
40Ω 10Ω 10mA ±(0.05% Rdg + 0.02% FS) 30ppm Rdg + 1ppm FS
1mΩ 10mA ±(0.05% Rdg + 0.03% FS) 30ppm Rdg + 4ppm FS
400mΩ 100μΩ 10mA ±(0.05% Rdg + 0.05% FS) 30ppm Rdg + 25ppm FS
40mΩ 10μΩ 100mA ±(0.05% Rdg + 0.05% FS) 30ppm Rdg + 25ppm FS
General Specifications
Measurement 4 terminal Kelvin/Thomson principle eliminates errors due to lead resistance.
Display 15mm LCD 4000 count with automatic decimal point and polarity indication.
Ranges 6 push button selected with LED indication.
Terminals 4mm binding posts accept spade tags and 4mm banana plugs.
Mains Supply 100, 120, 220 and 240V +10 to 13%
47 to 63Hz 20VA.
Safety EN 61010-1
EMC 61326.
Calibration Digital security key protected.
Auto Zero Permits the automatic zero of amplifiers and external circuits, eliminating errors due to thermal EMF.
Protection 415V rms maximum at the measuring terminals will blow internal protection fuse.
Battery 6V, 2.8Ah sealed lead acid battery with built-in charger. 14 hour typical operating time on lowest range,
28 hours typical on other ranges. Internal charger and automatic switch off.
Working Temperature 0 to +40°C with relative humidity 80% max non-condensing.
Storage Temperature -20 to +50°C.
Dimensions 15 x 250 x 88mm (w x d x h) approx.
Weight 3.5kg.
Cropico DO4a warranty 1 year (subject to registration with Seaward).


Cropico DO4A Datasheet

PDF Specifications of the Cropico DO4A digital ohmmeter.

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Cropico DO4A Portable Milliohmmeter
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C02A 1m cable clamp with metal base for the precise measurement of 1m cable samples. 930214
C03 1m cable clamp with water bath for the precise measurement of 1m cable samples. 930419
HS01 Duplex handspikes with 3m lead length 190082
HS02 Duplex handspikes with 3 and 15m lead length 190055
LS03 Lead set with 2 x 3m leads terminated in large Kelvin clips type KC3 190042
LS04 Lead set with 3 and 15m lead length terminated in large Kelvin clips type KC3 190046
LS05 Lead set with 4 x 1m leads terminated in banana plugs, 4 x crocodile clips,
4 x test probes and 2 x Kelvin clip type KC1.
LS06 Lead set with 1m leads terminated in miniature Kelvin clips type KC2 190007
MTS2 Calibration Standard 930241

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