Micro-Ohmmeter

  • Product No:LOM-510A
  • Manufacturer:IET LABS, Inc. 

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)