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Cropico DO4A Portable Milliohmmeter
Includes: mains cord, measuring leads with Kelvin Clips, handbook and certificate of conformity.
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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.
Mains/rechargeable battery operation.
Open circuit lead warning.
Rugged industrial maintenance free design.
|Range||Resolution||Typical Current||Accuracy @20°C ±5°C 1 Year||Temperature Coefficient (°C)|
|4kΩ||1Ω||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|
|4Ω||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|
|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.
|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.|
|Cropico DO4a warranty||1 year (subject to registration with Seaward).|
No customer reviews for the moment.
|C02||1m cable clamp with metal base for the precise measurement of 1m cable samples.||930150|
|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|