Option Information - Tektronix TM 503 Instruction Manual

Option information ~ TM 503
OPTION 2
INTRODUCTION
This factory installed option adds 25-mil squarepin connectors to the rear of the interconnecting jacks at all pin locations from pins 144A
and B through pins 28A and B, This will keep the interface flexible by making it easy and fast to change customized wiring using prepared wires
with squarepin receptacles and long-nose pliers or tweezers. It also protects the circuit board from damage by repeated soldering and
unsoldering of jumper wires. This option also adds three BNC connectors and one 5G0-pin connector to the rear panel. These connectors are not
pre-wired in order to give a system designer as much flexibility as possible, instead, prepared jumpers, coax cables, and interconnection jack
barriers are included in the TM503.
SYSTEM DESIGN DIRECTIONS
1. Plan the plug-in location {left, middle, or right) based on frant-panel controls and operator convenience as well as interface
connections.
2. Plan the wiring between interconnecting jacks and to the rear panel connectors carefully before starting assembly. A mating rear
panel 50-pin connector and cover are provided for external cabling.
NOTE
There are no pin assignments for the rear panel connectors, due to the great variety of possible connections.
When high frequency or fast digital signals are involved, plan the wires so as to minimize crosstalk. Make allowance for the
possible need to make auxiliary ground connections.
The 50-pin rear panel connector will be easier to wire if it is removed and then reinstalled after wiring is complete. {The rear
panel cutout exposes the 50-pin connector mounting hardware for ease of removal and replacement.)
3. Pin assignments for individual plug-ins will be found in the appropriate instruction manual.
4. install an interconnection jack barrier at the appropriate location on the interconnection jack, refer to TM5Q3 instruction manual for
keying assignments for farnily functions.
5. Select and install the wires {hook-up or coax} following the guidelines in the Wire Use part of these instructions.
6. Wires or cables which may be at large potential differences should be dressed or bundled so as to avoid contact. Keep all interface
wiring away from the TM503 primary line wiring.
WIRE USE
7. 5-inch long hook-up wire with squarepin receptacle on both ends (20 pieces}. These may be used for low-frequency or DC circuits
where impedance levels and crosstalk are not a problem. This wire length is convenient for cannections between adjacent interconnecting jacks.
2, 8-inch long hook-up wire with squarepin receptacle on both ends (20 pieces). These may be used for low-frequency or DC circuits
where impedance tevels and crosstalk are not a problem. This wire length is convenient for connections between the left- and right-hand
interconnecting jacks.
3. Q-inch long hook-up wire with a squarepin receptacle on one end only (20 pieces}. These may be used for low-frequency or DC
connections from any interconnecting jack to any rear panel connector. It will be necessary to cut the wire to length, then strip and tin the end
of the wire to be connected to the rear panel connector.
4, 5-inch long coaxial wire with squarepin receptacles on both ends (20 pieces}. These are used for connections which require shielding
or which must maintain a 50 ohm characteristic impedance. The outer conductor should be connected to either chassis ground or circuit
ground, Plug-in lines which require coax leads usually have a specified ground pin assignment. {f necessary, establish auxiliary ground
connections at the appropriate wire ends. These coaxial wires are a convenient length for connections between adjacent interconnecting jacks.
5, 9-inch long coaxial wire with squarepin receptacles on both ends (30 pieces}. These coax wires are for applications such as those
mentioned in item 4 above. The wire length is convenient for connections between the left- and right-hand interconnecting jacks or between
any interconnecting jack and a rear panel connector. When connecting one end of the coaxial wire to a rear panel connector, it will be necessary
to cut the wire to length, separate the shielding braid, then strip and tin the connector end of the wire.