TOS1

<p>The TOS1 transformer ohmmeter standard has been designed to be used with ohmmeters as a high accuracy reference resistance standard. This unique standard provides resistance measurements across a wide range of uses when calibrating ohmmeters and is designed for use as a laboratory calibration standard, or as a portable check standard for field resistance verification of any ohmmeter.</p> <p>The TOS1 is primarily designed to be used in calibration facilities where accurate resistance values are required and can be used with any single-phase or three-phase ohmmeter. When testing three-phase ohmmeters with the TOS1, use the instrument’s single-phase excitation method.</p> <h3>Key features</h3><ul><li>High accuracy ±0.1 % ohmmeter standard</li><li>Rugged design for field use</li><li>Designed to be used with large test clips or banana jack inputs</li><li>Four terminal Kelvin – no lead compensation</li><li>Universal standard for use with all ohmmeters</li></ul>