Figure 1-76. Weinschel, Model VM4A, Attenuator and Signal Generator
Weinschel, Model VM4A, Attenuator and Signal Generator Calibrator System (fig. 1-76), is a broad-band, dual channel
to 0 dBm. The VM-4A (fig. 1-76, item 1) contains the main microprocessor, controller subsystem, front panel keyboard and
display unit. The VM-4A/HO-2 (fig. 1-76, item 2) contains the tracking oscillator, phased-locked loop subsystem and 30
MHz self-test module. When the VM4A is used with model 4312A/K-16P microwave system, it serves as the buss
controller. Programming is accomplished by model VM4A front panel controls.