Product description High accuracy ±0.1% of the standard ohmmeter Robust construction for field use Designed for use with large test clips or banana-type inputs Four-wire Kelvin – no lead compensation Universal standard for use with all ohmmeters The TOS1 transformer ohmmeter is designed for use with ohmmeters as a high-precision resistance standard. This unique standard provides resistance measurements across a wide range of applications during ohmmeter calibration and is intended for use as a laboratory calibration standard or as a portable control standard for verifying any ohmmeter's resistance in field conditions.
TOS1 is mainly intended for calibration centers requiring precise resistance values and can be used with any single-phase or three-phase ohmmeter. When testing three-phase ohmmeters with TOS1, use the single-phase excitation method.