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Cropico DO7e Digital Ohmmeter
Includes: mains cord, measuring leads with Kelvin Clips, handbook, and Cropico DO7e calibration certificate.
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The Cropico DO7e is an accurate bench/portable Digital Ohmmeter for the measurement of resistance in the range 1μΩ to 600Ω. It offers you the four terminal resistance measurement method to eliminate the effect of lead resistance. The measured values are displayed on a 4-digit LED display; an overflow of the selected range is also indicated.
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. High accuracy and long term stability is achieved by using specially selected components.
The measuring ranges may be automatically or manually selected. Rechargeable batteries means real portability with more than 1 hour of continuous operation on the lowest ranges, and 20 hours on all others. Automatic Power Off ensures maximum battery life. The internal charger will boost charge to 90% of full charge, switching automatically to a trickle maintenance charge. Warning LEDs illuminate when an open circuit lead condition is detected.
Simple push-button or auto-range selection of the range required, ensures that the DO7e may be easily used by unskilled personnel. Error and status warnings are illuminated when appropriate.
Automatic Power Off ensures maximum battery life. The internal charger will boost charge to 90% of full charge, switching automatically to a trickle maintenance charge.
True 4 wire measurement eliminates lead resistance.
6 push button ranges 6mΩ to 600Ω.
Resolution 1μΩ on 6mΩ range.
10A measuring current on lowest range.
0.8” LED display daylight viewable.
Input protection up to 415Vrms.
Forward and reverse current measurement.
Auto average of forward and reverse measurement.
Auto power off.
Mains/rechargeable battery operation.
Digital calibration pass code protected.
|Range||Resolution||Typical Current||Accuracy @20°C ±5°C 1 Year||Temperature Coefficient/°C|
|600 Ω||100 mΩ||1 mA||±(0.25% Rdg + 0.05% FS)||40ppm Rdg + 30 ppm FS|
|60 Ω||10 mΩ||10 mA||±(0.25% Rdg + 0.05% FS)||40ppm Rdg + 30 ppm FS|
|6 Ω||1 mΩ||100 mA||±(0.25% Rdg + 0.05% FS)||40ppm Rdg + 30 ppm FS|
|600 mΩ||100 μΩ||1 A||±(0.25% Rdg + 0.05% FS)||40ppm Rdg + 30 ppm FS|
|60 mΩ||10 μΩ||10 A||±(0.25% Rdg + 0.05% FS)||40ppm Rdg + 30 ppm FS|
|6 mΩ||1 μΩ||10 A||±(0.25% Rdg + 0.05% FS)||40ppm Rdg + 250 ppm FS|
|Measurement||4 terminal Kelvin/Thomson principle eliminates errors due to lead resistance. Open circuit measurement voltage of 2 V DC.|
|Display||0.8" LED, 6000 count with automatic decimal point and polarity indication.|
|Ranges||6 push button selected with LED indication.|
|Terminals||6mm binding posts accept 6 mm bare wires and 4mm banana plugs (4 mm safety sockets).|
|Working Temperature||0 to 40°C, relative humidity 80% max non-condensing.|
|Storage Temperature||-20 to +50°C.|
|Mains Supply||115/230 V +10% -10%
47 Hz to 63 Hz, max 20 VA.
|Protection||415 V rms maximum at input terminals.|
|Calibration||Digital, security key protected.|
|Battery||Sealed lead acid battery with built-in charger. Greater than 1000 measurements on lowest (10 A) range and 20 hours on other ranges from a fully charged battery.|
|Average||Automatic average and display of measurement with forward and reverse current.|
|Dimensions||343 x 327 x 152 mm (W x D x H) approx.|
|Weight||6 kg (13lbs) approx.|
|Cropico DO7e warranty||1 year - subject to registration with Seaward.|
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|DO7-RS||Remote start plug.||190109|
|HS01||Duplex handspikes with 3m lead length||190082|
|HS01-RS||Duplex handspikes with 3m lead length with remote start button.||190083|
|HS02||Duplex handspikes with 3 and 15m lead length.||190055|
|HS02-RS||Duplex handspikes with 3 and 15m lead length with remote start button.||190058|
|LS03||Lead set with 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|
|CH01||Kelvin test probe (set of 2).||930108|