GenRad Contents Applic. Products Selection Index prod ucts High Accuracy p. 2 pp. 4-8 pp. 12-87 pp. 9-11 p. 89 pp. 50-87 Micro-Ohmmeter p. 1 of 2 LOM-510A Series 1 μΩ resolution Four measurement modes Features and ac ces so ries to assure that very 0.02% basic accuracy Auto-zero switched dc mode low resistance mea sure ments are ac com - plished ac cu rate ly, eas i ly, and eco nom i cal ly. Digital output Probes for chips and traces HIGH PERFORMANCE LOW RESISTANCE MEASUREMENT The LOM-510A has 4½ digits, 0.02% basic Constant dc Mode: accuracy and 1 μΩ res o lu tion. Its 4-terminal Suitable for measuring the resistance of measurement tech nique elim i nates lead re- in ductiv e components such as coils or trans- sis tance errors and 80 dB of ac noise re jec tion form ers. provides rock-steady read ings even in noisy Pulsed Mode: locations. The unit comes with rugged 4-termi- Provides low drive current to allow mea- nal test clips and a large se lec tion of optional sure ments of fuses, thermistors, and other probes, clips and fi x tures allowing at tach ment ther mal ly sen si tive de vic es. to any low-resistance unknown. Dry Circuit: Switched dc Mode: Assures that oxides and fi lm contacts are not Allows measurement of switch con tacts, punc tured. The Dry Circuit Mode limits the welds, shunts, PC board tracks and other pri- open circuit voltage to 50 mV. The Model marily resistive elements. Thermal emf eff ects LOM-510A/20 limits the open circuit voltage are eliminated. Model LOM-510A Micro-ohmmeter shown with to 20 mV. LOM-501 Standard 4-Ter mi nal Kelvin clips PORTABLE POWER, RUG GED, AND MORE Portability permits many field applications The BP-511 AC Power Source can be me- such as the mea sure ment of very low re sis - chan i cal ly attached to the micro-ohmmeter with the op tion al Model LOM-513 coupler tances of r ail or pipe bonds, welds, airframes, motors, trans form ers, and power distribution kit, and both units come in heavy-duty metal cases. A built-in battery charger is provided ap pa ra tus. as are LED's to in di cate low-battery con di tions The optional Model BP-511 Battery Driven and charger op er a tion. See the BP-511 Bat- ac Power Source will operate the micro-ohm- tery Driven ac Power Source data sheet. me ter from its internal battery for more than an hour continuously, worst case, and for an in de ter mi nate ly large number of hours when used in nor mal op er a tion. In addition, the 40 watt, 120 Vac, 60 Hz output can be used to make almost any other small in stru ment or tool portable. Model LOM-510A shown with LOM-504 heavy duty Kelvin clips IET LABS, INC. in the GenRad Tradition www.ietlabs.com TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988 534 Main Street, Westbury, NY 11590 Electronic cat/LOM p1/02-26-06 46 GenRad Con tents Applic. Products Selection Index prod ucts p. 2 pp. 4-8 pp. 9-11 pp. 12-87 p. 89 High Accuracy pp. 50-87 Micro-Ohmmeter p. 2 of 2 LOM-510A Series SPEC I FI CA TIONS LOM-510A MICRO-OHMMETER Pulsed Mode: One cycle of SW (Switched dc) mode; enabled by Accuracy: short ing two con tacts on rear panel connector. Display: 4½ digit, 0.5 inch, red LED display. Model SW DC Pulsed Mode (Switched dc) (Continuous dc) LOM- Display Overrange In di ca tion: Flashes for DC (Continuous dc) and 510A 0.02% + 2 counts + 2 μΩ 0.04% + 2 counts + 2 μΩ 0.02% + 4 counts + 2 μΩ SW (Switched dc); blanks in Pulsed mode. 510A/20 0.03% + 3 counts + 2 μΩ 0.05% + 3 counts + 2 μΩ 0.03% + 4 counts + 2 μΩ Measurement Rate: 1.5 readings/second. Connections to Un known: 4-ter mi nal Kelvin leads with shield. Range Max Dissipation Drive Outputs: 5 BCD digits for value and polarity; Pulsed Mode Control (Full Scale) DC SW Resolution lines; power supply lines; 25 pin "D" connector. 19.999 mΩ 1 A 20 mW 5.0 mW 1 μΩ 199.99 mΩ .1 A 2.0 mW .50 mW 10 μΩ Warm up time: 1 minute to rated accuracy. 1.9999 Ω 10 mA .2 mW .05 mW 100 μΩ Accuracy vs. Temperature: Stated accu ra cy applies over an am bi ent 19.999 Ω 1 mA .02 mW .005 mW 1 mΩ tem per a ture range of 18 to 27 °C. Error doubles over the range of 10 199.99 Ω .1 mA .002 mW .0005 mW 10 mΩ to 40 °C. Zero Adjust: Active only in DC (Continuous dc) mode. Accessories Supplied: LOM-501 test clips. Noise Rejection: 80 dB for SW (Switched dc) and Pulsed Mode; 60 Power Requirements: 105-125 V or 210-250 V, 50-60 Hz, 30 W dB for DC (Continuous dc) mode. max. SW (Switched dc) Mode: Current switched on for 166 ms, then off for Dimensions: 22.9 cm W x 5.1 cm H x 27.9 cm D (9" x 2" x 11") 500 ms (duty cycle = 0.25). Weight: 2.7 kg (6 lb). ACCESSORIES 504 probe set has 1.9 cm (1.75") jaw open ings and 3.7 m (12') lead LOM-501 4-Terminal-Kelvin Clips: The Model 501 test clips are fully lengths that permit mea sure ments on large bush ings, weld ed and bolted insulated and their 1/4 inch jaw open ings will ac com mo date al most any joints, rails and pipes, trans form ers and motors, fuses, power dis tri - elec tron ic com po nent. They have min ia ture tips for grasp ing very fi ne bu tion bus ses or near ly any other large elec tri cal com po nents. wires and other small items. Lead length is 1 m (39"). LOM-506 4-Ter mi nal Kelvin Mi cro probes: The Model LOM-506 mi cro probes permit mea sure ment of chips, cir cuit board com po nents, LOM 501A: Same as LOM-501; leads are and fine con duct or traces . They also make mea sure ments pos si ble 2 m (79") long. in ar eas which are in ac ces si ble LOM-502 4-Ter mi nal Kelvin Clips: Pair to oth er probes, such as in side of clips, same as Model LOM-501, but a con nec tor. The finely-point ed, unwired. spring-load ed tips are on 1.27 mm (.05") cen ters. They are made from LOM-504 4-Terminal Heavy-Duty Kelvin Clips: (Shown with Model LOM-510A Mi cro-ohm me ter, pre vi ous page, center). The Model LOM- hard ened beryllium copper, gold plated over nickel plate. They are re place able LOM-512 COMPUTER IN TER FACE AND LIM ITS COM PAR A TOR Pulse Mode Enable & Trigger Switch es: Allow manual operation of Serial Output: Allows con nec tion to RS-232C in ter face of a computer the single mea sure ment mode of operation of Model LOM-510A. Use- or a printer . Can be converted to true RS-232C with sim ple external cir- ful for mea sure ments on thermally sensitive com po nents. cuit for applications re quir ing ca ble lengths in excess of twelve feet. Power Requirements: Powered by LOM-510A Micro-Ohmmeter. Additional TTL-compatible output signals on rear panel connector: Low Limit Ex ceed ed, High Limit Exceeded, Data Ready. Accessories Supplied: Model LOM-512-1 adapt er cable. Input: Trigger measurement - initiates a single measurement cycle, Dimensions: 22.9 cm W x 5.1 cm H x 27.9 cm D (9" x 2" x 11"). TTL-com pat i ble, avail able at rear panel connector. Weight: 2.3 kg (5 lb). ORDERING IN FOR MA TION LOM-501A Kelvin Test Clips (pair, length 2 meters) LOM-510A-110 Digital Micro-ohmmeter w/LOM-501 test clips; 110 Vac oprtn. LOM-502 Kelvin Test Clips, without cable (pair) LOM-510A-220 Digital Micro-ohmmeter w/LOM-501 test clips; 220 Vac oprtn. LOM-503 Kelvin Test Clips, E-Z Hooks (length 1 meter) LOM-510/20 Digital Micro-ohmmeter, w/20 mV dry circuit option, and w/LOM-501 test clips LOM-504 Kelvin Test Clips, Heavy Duty, 2 inch jaws pair, length 1 meter) LOM-506 Kelvin Microprobes (pair, length 1 meter) LOM-530 Calibration Kit for LOM 510-A LOM-506-1 Replacement Microprobes, set of 4 BP-511 Battery Pack, AC Source, 115 V, 60 Hz, 40 W (see p. BP-511-1 Adapter Cable, power, connects LOM-510A to BP- 45) LOM-512 Computer Interface-Digital Comparator for Model 511, (supplied with model BP-511) LOM-512-1 Adapter cable, data, connects LOM-510A to LOM- LOM-510A. 512, (supplied with model LOM-512) LOM-501 Kelvin Test Clips (pair, length 1 meter) LOM-513 Coupler Kit (attaches BP-511 or LOM-512 to LOM- IET LABS, INC. in the GenRad Tradition www.ietlabs.com TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988 534 Main Street, Westbury, NY 11590 Electronic cat/LOMp2/07-08-04 47