This unit powers up and functions. I have tested it using NTSC input from my digital video camera. (see pictures) It produces nice vector densities and other graphs when connected to an input, and circles and flat lines when not connected. The unit is exceptionally clean. 520A's are very easy to use.
It was recently calibrated (1999), the calibration seals are unbroken. A good working 520A like this one is hard to find. :SATISFACTION: From the tektronix info site:
Vectorscope Luminance Amplitude Chrominance Amplitude and Phase Differential Phase Differential Gain Vector display shows the relative phase and amplitude of the chrominance signal on polar Dual Vector Displays In dual-channel operation, successive samples of channels A and B are displayed on a time-shared basis. Time Base Displays The linear time base operates at the line rate. Red (R), Green (G), Blue (B), and Luminance (Y) Provides a luminance channel that permits the separation and display of the luminance (Y) component from the composite color signal. Vertical Interval Test Signal Observation You can display vertical Interval Test Signals from front-panel selected lines of either field 1 or 2. Differential Gain and Differential Phase Measurements The two main chrominance signal distortions - differential gain and differential phase - can be measured.This unit takes a standard computer power cable. It ships without one.
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(Click on the thumbnail images to enlarge)