Our 1.5LTE Low Thermal Expansion Length Reference Bar provides a stable length artifact for use during laser tracker, articulating arm or scanner jobs. Its unique design minimizes length changes in the bar due to thermal growth. This provides a virtually constant length through a wide working temperature range. Testing has shown that the 1.5LTE has a thermal stability 40% better than Invar.

Integrated target holders on each end are positioned off-axis and allow the SMR to rotate 360° for easy visibility. A new 3-point mount constrains the bar in the field exactly as it is certified at the factory to assure the highest accuracy possible. Set the bar anywhere in your measurement volume to confirm instrument accuracy or add reference points to your network.

The 1.5LTE consists of a single length of invar tubing with two permanently mounted aluminum end caps, each with a 1.5” magnetic SMR nest (SMRs not included). Switching SMR sizes during a measurement session is easy with a 1.5ADP-.5 or 1.5ADP-.875 adapter to locate 0.5” or 0.875” SMRs at exactly the same point as a 1.5” SMR.

This item is available in a 1 meter length (target center to target center), where the reference bar’s actual length is within ±1.5mm (±0.06”) of 1 meter. The LTE bar is certified with a NIST traceable measurement that includes an expanded uncertainty of ±0.007mm at a 95% confidence interval. Patent No. US 8,141,264.