NIST Model PM2 Power Measurement System for 1 mW at 1 GHz

摘要

The design and operation of an automated measurement system designed to measure power accurately at the level of mW and at the frequency of 1 GHz are described. The system consists of commercial IEEE Std-488 bus-controlled instruments, a computer controller, and software. The results of a series of measurements are output to the computer display and, optionally, to a printer. The results are the mean of the measurement series and an estimate of the Type A (here random) and Type B (here systematic) uncertainty. The estimated total expanded uncertainty for the average of six consecutive measurements of a nominal 1 mW, 1 GHz source is typically less than 1 percent. The system can measure any power for 0.1 to 10 mW at any microwave frequency by making appropriate changes to the software and, possibly, the hardware.