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The Tektronix TM 503 3-Slot Test and Measurement System Mainframe is designed so that connections between modules and / or external equipment can be made by the mainframe rear interface board and optional rear-panel connectors. Each plug-in has selected lines brought to its interface, some parallel to front-panel connections, others present only at the interface. Normally, these lines are left open, but they may be connected by the user to reduce front-pane clutter or to perform functions not otherwise available. For example, digital counters have serial bcd outputs which may be brought out for data logging or processing. Lines available for plug-in modules. Digital Counters: Bcd serial by digit, Range code, Scan clock out, Scan clock in and internal scan disable, Reset, Time slot zero, Data good and Signal in (selected by front-panel switch). Digital Multimeters: Scan clock out, Decimal point, Bcd serial by digit, Least significant digit, Most significant digit, Data transfer and Polarity. Power Supplies: Supply output through rear connection, Remote sense, Remote analog voltage control and Remote analog current limit control. Amplifiers: Signal Out and Signal In. Monitor: X, Y, and Z inputs. Oscilloscope: Ramp out and Gate out. Option 02 power modules are shipped with a rear·panel multipin connector, a mating cable connector, and one rear-panel BNC connector for each plug-in compartment. The user may wire these to the interface board as required. Option 02 is also supplied with square pin connectors on the rear interface board, and a supply of jumper wires with square pin receptacles.
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