Leading Particulars
8500C/8500C+ System Maintenance Manual 1-7
1.3.2 8520C Signal Selector (Figure 1-2)
The 8520C signal selector switches to the appropriate Velocimeter and magnetic pickup or photocell
channel as selected by the 8500C/C+, and sends those vibration signals to the 8500C/C+ for
processing. The 8520C also routes 28 VDC power to the 8500C/C+. The front panel contains 12
connectors for connection to Velocimeter sources, and four connectors for connection to magnetic
pickup, photocell, and optical tracker sources. There are two connectors on the rear panel: the first is
for 28 VDC input power and the second connector is for receiving and transmitting selected signals to
and from the 8500C/C+.
The 8520C unit contains the following items:
• Power supply board:
Generates DC operating voltages for the printed circuit boards and
transducers.
• Controller board:
Selects the input signal as directed by the 8500C/C+.
• Quad peak detector board:
Required for use with the FasTrak optical tracker. Determines
whether incoming sync signals are from an optical tracker.
• 28 VDC power line filter:
Filters out line spikes, noise generated on power line.
• Power/signal harness and Velocimeter/magnetic-pickup/photocell harness:
Interconnects the
printed circuit boards and input connectors.
1.4 Leading Particulars
Leading particulars for the system and its major components are listed in Table 1-4.
1.5 Related Publications
Table 1-1. 8500C/C+ Balancer/Analyzer System, Major Components
Part No. Nomenclature Purpose Qty.
8500C/C+ Balancer/Analyzer
Printer Disk Drive
Acquires, displays, and analyzes
vibration data and presents balance
solution. Loads, stores, and prints
vibration and related data.
1
8520C Signal Selector Switches vibration and magnetic
pickup/photocell signals to send to
8500C/C+.
1
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