MICRO-OHMMETERS Low Resistance Testers MICRO-OHMMETERS Low Resistance Testers Since pioneering the first ever Digital Micro-ohmmeter over twenty years ago, ALBER has been known as the industry leader in the design and manufacture of “Storage Battery” test equipment. Today, through visionary technology, ALBER continues to set the standards for low resistance measurement. Their product line of five instruments is the widest range offered by any manufacturer. System Description Micro-ohmmeters are instruments specifically designed What distinguishes one micro-ohmmeter from another to eliminate the guesswork when determining electri- is the amount of current used in the measurement, as cal connection problems. Applications include measur- well as the number of measuring ranges. ALBER in- struments use higher average current across measur- ing the resistance of switch and circuit breaker con- tacts; transformers and motors; aircraft, rail and pipe ing ranges than any other manufacturer, allowing them to provide accurate, consistent readings even in a high bonds; cable splices, welds and fuses; metal alloys, graphite electrodes, wire and cable. noise environment. ALBER micro-ohmmeters use a technique known as The internal power source that provides the constant DC measurement current is either a battery, AC pow- four-wire measurement to test for very low resistances. This highly accurate yet simple method passes a known ered supply, or a combination of both. Rating of an in- strument is usually the highest current used on the low- current through the unknown resistance being tested while measuring the voltage drop. Results are displayed est resistance range. Standard current ranges offered by a digital voltmeter. are 10, 25 and 100 Amps. Selection Criteria 3) Will the unit be used for battery intercell connec- 1) What range of readings is required? tions? Refer to the back page of this brochure for specifi- The RT3-100L and the RT-10 feature specially- cations. designed safety circuits built in to protect against active circuits. 2) Will the unit be used for highly inductive loads 4) Is battery operation a desirable feature? such as transformers? If battery operation during testing is desired, select Battery operated units are not well suited for this type of application due to the high amount of energy either the RT-10, the RT5-10 or the RT3-100. These units can all be used continuously without interfer- required per reading. The AC powered RT4-25 and the RT5-10 are designed specifically for this pur- ing with the battery system. The RT-10 also fea- pose. tures built in safety circuits. Connector Options Kantwist Leads Standard Leads Spike Probe Leads Concord-Mueller Leads RT3-100 Designed to meet NEMA and ANSI Battery Powered standards for power equipment testing, 3-1/2 Digit Display the RT3-100 is the most accurate and Two Ranges 0-20.00 Milliohms repeatable reading instrument on the 1 Microhm Resolution market today. Due to limited range, it Battery Saver Circuits is primarily used for switchgear, power circuit breakers, welds, high current joints or bonds and intercell connec- tions on batteries. RT3-100L The RT3-100L is the lightest 100 Amp AC Powered continuous rated current instrument on 3-1/2 Digit Display the market. Similar in performance to Two Ranges 0-20.00 Milliohms the RT3-100, this unit offers the addi- 1 Microhm Resolution tional features of AC power and spe- Protected Against Active Circuits cial built in safety circuits. This instru- ment can also be used continuously and is ideal for testing battery intercell connections. RT-10 The RT-10 is a lightweight, general Battery Powered purpose instrument with very high reso- 4-1/2 Digit Display lution. Designed to operate well in high Five Ranges 0-200.00 Ohms 50/60Hz noise environments, this unit 1 Microhm Resolution is well suited for testing in high voltage Light Weight switchyards. Special safety circuits pro- tect against active circuits up to Protected Against Active Circuits 500VDC, making it ideal for battery test crews. RT4-25 The RT4-25 is the ideal unit for power AC Powered transformer testing. High test current 3-1/2 Digit Display is used on all ranges, providing a stable Five Ranges 0-20.00 Ohms reading in a short period of time. Wide 1 Microhm Resolution range of measurement and high test current make the RT4-25 a good gen- eral purpose instrument in situations where battery operation is not a require- ment. RT5-10 The RT5-10 offers both an AC powered AC and/or Battery Powered supply and a battery source capable of 3-1/2 Digit Display delivering 10 Amps. This dual power Five Ranges 0-20.00 Ohms supply, coupled with a wide measuring 1 Microhm Resolution range, makes this instrument the most versatile. Instrument applications range from battery intercells to power circuit breakers to power transformers. MICRO-OHMMETER System Specifications TEST GENERAL MODEL RANGES RESOLUTION CURRENTS Accuracy Power Source Weight 0-1999 Microhms 1 Microhm 25 Amps 0.25% Line Approx. 0-19.99 Milliohms 10 Microhms 25 Amps of Reading 115/230VAC 25 lbs. RT4-25 0-199.9 Milliohms 100 Microhms 10-25 Amps +/- 1 LSD 50/60 Hz 0-1.999 Ohms 1 Milliohm 6 Amps 0-19.99 Ohms 10 Milliohms 0.5-6 Amps 0-1999 Microhms 1 Microhm 10 Amps Rechargeable Approx. 0-19.99 Milliohms 10 Microhms 8 Amps 0.25% Battery 27 lbs. RT5-10 0-199.9 Milliohms 100 Microhms 6 Amps and AC Line 0-1.999 Ohms 1 Milliohm 85 Milliamps 0-19.99 Ohms 10 Milliohms 70 Milliamps 0-19999 Microhms 1 Microhm 10 Amps 0-199.99 Milliohms 10 Microhms 1 Amp 0.25% Rechargeable Approx. 0-1.9999 Ohms 100 Microhms 0.1 Amp RT-10 Battery 14 lbs. 0-19.999 Ohms 1 Milliohm 10 Milliamps 0-199.99 Ohms 10 Milliohms 1 Milliamp Rechargeable Approx. 0-1999 Microhms 1 Microhm 100 Amps RT3-100 0.25% Battery 27 lbs. 0-19.99 Milliohms 10 Microhms 100 Amps Line Approx. 0-1999 Microhms 1 Microhm 100 Amps RT3-100L 0.25% 115/230VAC 25 lbs. 0-19.99 Milliohms 10 Microhms 100 Amps 50/60 Hz Note: Specifications and prices subject to change without notice. For further information on which Micro-ohmmeter is best suited to your individual requirements, contact Represented By: your local ALBER representative or ALBERCORP direcly at: Albér Corp. 990 South Rogers Circle, Suite 11 Boca Raton, Florida 33487 561-997-2299 / Fax 561-997-5588 Intemet: http://www.alber.com e-rnail: alber@alber.com All Albercorp Products are Engineered, Designed and Manufactured in the U.S.A.