Description

The Laurel Electronics Laureate™ Ohmmeter is ideal for high-speed, high-accuracy resistance measurements in a production environment, such as contact resistance measurements. It is factory calibrated for five jumper selectable resistance ranges from 20.000 ohm to 200.00 kohm. Fixed, factory-special ranges of 2.0000 ohm, 2.0000 Mohm and 20.000 Mohm are also available. Accuracy is an exceptional ±0.01% of reading ± 2 counts. Resolution is one part in 20,000. In the 2 ohm range, resolution is 0.1 milliohm, making the meter suitable for contact resistance measurements.

Meter connections can be via 2, 3 or 4 wires. With 4-wire hookup, 2 wires are used for excitation and two separate wires are used to sense the voltage across the resistance to be measured, thereby eliminating any lead resistance effects. With 3-wire hookup, the meter senses the combined voltage drop across the resistance to be measured plus two excitation leads. It also senses the voltage drop across one excitation lead, and then subtracts twice this voltage from the combined total. This technique effectively subtracts lead resistance if the excitation leads are the same.

All resistance ranges are digitally calibrated at the factory, with calibration factors stored in EEPROM on the signal conditioner board. This allows ranges and signal conditioner boards to be changed in the field without recalibrating the meter. If desired, the meter can easily be calibrated using external standards plus scale and offset in software.

Features:

• Five jumper-selectable resistance ranges of 20.000 ohm to 200.00 kohm
• Three fixed factory-special ranges of 2.0000 ohm, 2.0000 Mohm, 20.000 Mohm
• 0.1 milliohm resolution on 2 ohm scale for contact resistance measurements
• 2, 3 or 4-wire connection with lead resistance compensation
• Up to 60 conversions per second
• Universal 85-264 ACV / 90-300 DCV or 10-48 DCV / 12-32 ACV power
• Wide choice of options:
• 2 or 4 relays, mechanical or solid state (isolated)
• Analog output, 4-20 DCmA, 0-10 DCV, or -10 DCV to +10 DCV (isolated)
• Serial data I/O: Ethernet, USB, RS485, RS232 (isolated)
• Extended version to linearize and scale nonlinear reistance sources