digital micro ohmmeter
Model:DO7
FEATURES
The DO7 digital microhmmeter 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 a sealed ABS plastic case with lid and carrying handle.
The DO7 digital microhmmeter has many advanced features, including protection up to 415 volts rms at the measuring terminals, digital calibration and long scale length, 6000 count. Rechargeable batteries means real portability with more than 1 hour of continuous operation on the lowest ranges, and 20 hours on all others. Battery charge indicators are provided. 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.
A front panel socket provides a serial RS232 output for connection to an external printer or PC, and a socket is also provided for the connection of an external start switch, e.g. a foot switch.
The DO7digital microhmmeter is supplied ready for use with batteries, mains cord and test leads, no extras are normally necessary. For special lead sets we offer a variety of different styles which are listed on the accessories page, together with calibration standards.
Key Features
• Suitable for the the Utilies and Aerospace Industry.
• True 4 wire measurement eliminates lead resistance
• 6 push button ranges 600 microhms to 60 ohms
• Resolution 0.1 microhm on 600 microhm range
• 0.8' LED Display daylight viewable
• 10 Amp measuring current on lowest range
• Forward and reverse current measurement
• Auto average of forward and reverse measurement
• Input protection up to 415 Volts rms
• Printer output and remote start
• Digital calibration key protected
• Mains / rechargeable batteries with charge indicator and built in charger
Technical Specification
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Measurement
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4 Terminal Kelvin/Thomson principle eliminates error due to lead resistance. Open circuit measurement voltage~2V dc.
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Display
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0.8" LED 6000 count with automatic decimal point and polarity indication.
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Ranges
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6 push button selected with LED indication.
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Calibration
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Digital, security key protected.
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Protection
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415 rms maximum at input terminals.
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Battery
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Sealed lead acid, rechargeable cells giving a minimum of 1 hour of continuous measurement on the lowest 10 amp ranges and 20 hours on all other ranges. Internal charger with battery state indicator.
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Terminals
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6mm binding posts accept spade tags and 4mm banana plugs.
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Working Temp
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0...40°C rel. humidity 80% max. non-condensing
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Storage Temp
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-20...+50°C
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Mains Supply
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100/120/220/240 Volts +10% -13% 47Þ63Hz 20VA
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Safety
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IEC 1010 Protective Class 1.
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EMC
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Complies with EN61326
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Dimensions
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343 x 327 x 152 mm (W D H) approx.
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Mass
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8 kg approx.
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Accessories
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Supplied complete with mains cord, measuring leads with Kelvin Clips, handbook, and calibration certificate.
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Resistance Ranges
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Range
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Resolution
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Typical Current
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Accuracy @ 20°C ±5 °C, 1 year
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Temperature Coefficient / °C
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60Ω
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10mΩ
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1mA
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±(0.15% Rdg +0.05% FS)
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＜40ppm
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6Ω
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1mΩ
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10mA
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±(0.15% Rdg +0.05% FS)
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＜40ppm
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600mΩ
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100µΩ
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100mA
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±(0.15% Rdg +0.05% FS)
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＜40ppm
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60mΩ
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10µΩ
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1A
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±(0.15% Rdg +0.05% FS)
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＜40ppm
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6mΩ
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1µΩ
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10A
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±(0.2% Rdg +0.01% FS)
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＜40ppm
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600µΩ
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0.1µΩ
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10A
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±(0.2% Rdg +0.2% FS)
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＜40ppm
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