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1.5LRB Length Reference Bar
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Use an Invar length reference bar with your tracker |
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Our 1.5LRB Length Reference Bar provides a NIST-traceable
length for use during laser tracker or scanner jobs. Use
it to establish system scale when using single measuring
instruments or when bundling multiple instruments together.
Or use it to verify system accuracy and stability during a
measurement job. Many of our customers shoot a length
reference bar at the beginning, middle, and end of a job to
gain confidence that nothing moved or changed during the
shoot.
The 1.5LRB consists of a single length of our Invar tubing outfitted with two
permanently mounted, 1.5INV magnetic
SMR nests for a 1.5" SMR. (SMRs not included.)
Also included are two 15199 Invar
system "feet", positionable at your discretion.
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Deviation in length of 80" reference
bar at various temperatures |
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Temp °F |
Steel |
Aluminum |
Invar |
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40° |
-0.0180" |
-0.0292" |
-0.0015" |
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50° |
-0.0116" |
-0.0188" |
-0.0010" |
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60° |
-0.0052" |
-0.0084" |
-0.0004" |
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68°
(std. temp) |
±0.0000" |
±0.0000" |
±0.00000" |
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70° |
+0.0012" |
+0.0020" |
+0.0001" |
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80° |
+0.0076" |
+0.0124" |
+0.0007" |
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90° |
+0.0140" |
+0.0228" |
+0.0012" |
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The 1.5LRB is available in customer-specified lengths,
English or metric (90" or 2.3m maximum).
Actual length will be within ±1/32" (0.8mm) of requested length, but our
calibration lab will provide a certificate with NIST-traceability
indicating the actual length of the assembly within
±0.0001" (0.003mm).
Invar is an excellent
material for this application due to its extreme stability
over a wide temperature range. Take a look at the table
at left to see the stability of Invar
reference bars compared with other materials.
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Note: If you don't need NIST-traceability of a given dimension, but just
require a consistent length for system checks, you may
want to build your own reference bar using our
Invar system and
related targets. |
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Length accuracy: NIST-traceable certification to
±0.0001" (0.003mm); length of bar will be within
±1/32" (0.79mm) of requested length.
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Maximum length: 90" (2.3m)
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