Digital Ohmmeter -- Model DO4A

Features

True 4 wire input eliminates lead resistance errors. 6 ranges from 40.00 mOhm to 4000 Ohm (10microOhm resolution). Input protection to 415V RMS. Zero control - Thermal EMF compensation. Digital calibration. Line / rechargeable battery operation. Minimum 14 hours operation from full charge, built-in battery charger, full measuring functions during battery charging. Open circuit warning. Rugged industrial maintenance free design. Worldwide universal line operation 100/120/220/240 Volts.

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 aluminum case with tilt handle.

The rechargeable sealed lead acid battery means real portability with more than 14 hours continuous operation. Build-in charger with automatic switch-off to prevent deep discharge. Full measurement capability is maintained when batteries are being charged.

The DO4A is supplied ready for immediate use with battery, line cord and four wire test leads with Kelvin clips.

Technical Specification
Range	Resolution	Test Current	Uncertainty (1 year)
4000 Ohm	1 Ohm	100 uA	0.05%Rdg + 0.02%FS
400 Ohm	100 mOhm	1 mA	0.05%Rdg + 0.02%FS
40 Ohm	10 mOhm	10 mA	0.05%Rdg + 0.02%FS
4 Ohm	1 mOhm	10 mA	0.05%Rdg + 0.02%FS
400 mOhm	100 uOhm	10 mA	0.05%Rdg + 0.02%FS
40 mOhm	10 uOhm	100 mA	0.05%Rdg + 0.02%FS

Open circuit measurement voltage	Display	Protection:	Working temperature	Dimensions	Weight
5VDC	4000 count LCD	415VRMS	0 to 40 °C	215 x 250 x 88 mm (W D H)	3.5kg.

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