Features and ac ces so ries to assure that very low resistance mea surements are accomplished accurately, easily, and economically.
Features:
• 1 μΩ resolution
• 0.02% basic accuracy
• Digital output
• Four measurement modes
• Auto-zero switched dc mode
• Probes for chips and traces
• New switch design, improves reliability
• New external voltage selector switch
• New IEC inlet adapter with fuse
The LOM-510A has 4½ digits, 0.02% basic accuracy and 1 μΩ res o lu tion. Its 4-terminal measurement tech nique elim i nates lead resistance errors and 80 dB of ac noise rejection provides rock-steady read ings even in noisy locations. The unit comes with rugged 4-terminal test clips and a large selection of optional probes, clips and fi x tures allowing at tach ment to any lowresistance unknown.
Switched dc Mode:
Allows measurement of switch con tacts, welds, shunts, PC board tracks and other primarily resistive elements. Thermal emf effects are eliminated.
Constant dc Mode:
Suitable for measuring the resistance of in duc tive components such as coils or trans form ers.
Pulsed Mode:
Provides low drive current to allow mea sure ments of fuses, thermistors, and other ther mal ly sen si tive de vic es.
Dry Circuit:
Assures that oxides and fi lm contacts are not punc tured. The Dry Circuit Mode limits the open circuit voltage to 50 mV. The Model LOM-510A/20 limits the open circuit voltage to 20 mV.
Range (Full Scale) | Drive | Max Dissipation DC SW | Resolution | ||
19.999mΩ | 1A | 20mW | 5.0mW | 1 μΩ | |
199.99mΩ | .1A | 2.0mW | .50mW | 10 μΩ | |
1.9999Ω | 10mA | .2mW | .05mW | 100 μΩ | |
19.999Ω | 1mA | .02mW | 5μW | 1 mΩ | |
199.99Ω | .1mA | .002mW | .5μW | 10mΩ |
Accuracy:
SW (switched dc): 0.02% + 2 counts +2 μΩ dc (continuous dc): 0.04% + 2 counts + 2 μΩ
Pulsed mode: 0.02% + 4 counts + 2 μΩ
Zero Adjust: Active only in DC (Continuous dc) mode.
Noise Rejection:
80 dB for SW (Switched dc) and Pulsed Mode
60 dB for DC (Continuous dc) mode.
SW (Switched dc) Mode:
Current switched on for 166 ms, then off for 500 ms (25% duty cycle).
Pulsed Mode:
One cycle of SW (Switched dc) mode; enabled by short ing two con tacts on rear panel connector.
Display:
4½ digit, 0.5 inch, red LED display.
Display Overrange In di ca tion:
Flashes for DC (Continuous dc) and SW (Switched dc) blanks in Pulsed mode
Measurement Rate: 1.5 readings/second
Connections to Un known: 4-ter mi nal Kelvin leads with shield
Outputs:
5 BCD digits for value and polarity; Pulsed Mode Control lines; power supply lines; 25 pin "D" connector.
Warm up time: 1 minute to rated accuracy
Accuracy vs. Temperature: Stated ac cu ra cy applies over an ambient temperature range of 18 to 27 °C. Error doubles over the range of 10 to 40 °C.
Accessories Supplied: LOM-501 test clips
Power Requirements:
105-125 Vac or 210-250 Vac; 50-60 Hz selectable on rear panel 30 W max.
Mechanical:
Dimensions: 22.9 cm W x 5.1 cm H x 27.9 cm D (9" x 2" x 11")
Weight: 2.7 kg (6 lb)
LOM-530 (CALIBRATION KIT FOR LOM-510A)
Stability | Max Power | TempCo | Power Coefficient | |
0.01Ω | 50 ppm/year | 2 W | 20 ppm/°C | 0.1 ppm/mW |
0.1 Ω | 50 ppm/year | 1 W | 20 ppm/°C | 0.1 ppm/mW |
1Ω | 20 ppm/year | 0.25 W | 10 ppm/°C | 0.5 ppm/mW |
15Ω | 10 ppm/year | 0.1 W | 3 ppm/°C | 0.5 ppm/mW |
150Ω | 10 ppm/year | 0.1 W | 1 ppm/°C | 0.5 ppm/mW |
Temperature Range: 15° to 30°C
Storage Range: 0°C to 40°C
ORDERING INFORMATION
LOM-510A Digital Micro-ohmmeter
LOM-501C test clips
LOM-530 Calibration Kit for LOM 510-A
LOM-501C Kelvin Test Clips Cable Assembly (pair, length 1 meter)
LOM-501C-2m Kelvin Test Clips Cable Assembly (pair, length 2 meters)
LOM-501W Kelvin Test Clips Cable Assembly (wide)
LOM-502C Kelvin Test Clips, without connector (pair)
LOM-503 Kelvin Test Clips Cable Assembly, E-Z Hooks (length 1 meter)
LOM-504 Kelvin Test Clips Cable Assembly, Heavy Duty, 2 inch jaws pair, (length 1 meter)
LOM-506 Kelvin Microprobes Cable Assembly (pair, length 1 meter)
LOM-506-1 Replacement Microprobes, set of 4
LOM-501TF Test Fixture
LOM-501-XL Extra-Long cable for remote testing (up to 50 m)