Calibration Standards

Decade Resistance Box Precision Decade 2

Industrial Instruments, Beckman Cedar Grove Operations.


In addition to Beckman Cedar Grove (N.J.) Operations solution conductivity analyzers, Industrial Instruments, a division of Beckman Instruments after the 1995 acquisition, manufactured a line of stand-alone, highly accurate resistance boxes.  Our unit, the model 50D, has hand-wound resistors, except in the lowest range, which simply has low-resistance loops of wire.

 

Shasta Shasta label

Shasta Division, Beckman Instruments

The Shasta Division of Beckman Instruments made this Model 1201 WWV receiver in the early 1950s, a precursor to the popular Beckman/Berkeley Model 905 unit.  Both units have crystal-controlled front ends and vacuum tube circuitry throughout.