TM 9-6695-274-14
Figure 1-76. Weinschel, Model VM4A, Attenuator and Signal Generator
Calibration System.
Weinschel, Model VM4A, Attenuator and Signal Generator Calibrator System (fig. 1-76), is a broad-band, dual channel
vector voltmeter. The system has a frequency range of 10 MHz to 18 GHz and an attenuation range of -120 dB reference
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.
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