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Can I retrofit option H75 or H76 on my 478A Coaxial Thermistor Mount sensor?

The option H75 and H76 can not be retrofitted on an existing 478A. Either of these options must be ordered at the time the 478A is originally purchased.

The H75 and H76 are options for the 478A that represent optimized performance for VSWR. Specifically, from 1 MHz to 1 GHz maximum, VSWR is less than 1.3: 1, except at 50 MHz, maximum VSWR of 1.05:1.

The 478A-H75 or H76 is required with the 432A to calibrate the "POWER REF" (50 MHz at 1mW) reference output on 435B, 436A, 437B, 438A, 70100A, E1416A, E4418A, E4418B, E4419A, E4419B, E4416A, and E4417A power meters.

Calibration data is not provided with 478A option H75. If calibration data is required, order option H76 instead of H75.