Figure 1-68. Weight Set, 7910346.
The Avoirdupois Class T Weight, 7910346 (fig. 1-68) consists of two 5-pound, two 10-pound, and six 20-pound class T
tolerance dead weights. The weights are laboratory reference weights that conform to all NBS class T weights.
Figure 1-69. Tektronix, Type R491, Spectrum Analyzer.
Tektronix, Type R491, Spectrum Analyzer (fig. 1-69) is a wide band and general purpose portable instrument with an RF
center frequency range from 10 MHz to 40 GHz. The analyzer displays signal amplitude as a function of frequency for a
selected portion of the spectrum. Frequency is displayed along the horizontal axis (dispersion) and signal amplitude on
the vertical axis of a self-contained system.