Tektronix PG502 Instruction Manual page 9

Operating Instrucfions-PG 502
Refer to the rear connector assignment illustration in the
Service Section at the rear of this manual for suggested pin
assignments. These connections are not factory wired.
To obtain a trigger out signal complementary to the
front panel trigger out pulse, connect one end of a coaxial
cable to the pads on the Timing Board marked Internal Trig
Out. Connect the other end to appropriate pins as shown in
the illustration. Connections made to the Infernal Trig Out
pads do not +erfere with the front panel f TRIG OUT
signals. A one-half volt signal into 50 fi is available at the
Internal Trig Out pads.
To, obtain the + TRIG OUT signal at the rear interface
connector, disconnect the coaxial cable from the front
panel + TRIG OUT connector and the coaxial connector
labeled Trig, Out on the Timing Board. Replace this cable
with another 500 cable about ten inches long, with a
similiar coaxial ~nnector on one end. Solder the other end
to the holes located as shown in the illustration.
To obtain Trigger/Duration input capabilities at the rear
interface connector, remove the coaxial cable from the
front panel connetior and the coaxial corm&or on the
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Timing Board. Use a new piece of coax about ten inches
long with suitable connection. Solder the free end of this
cable to the rear interface pads located as shown in the
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illustration.
Remember, when planning to use the rear interFace
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connectors, pulse fidelity may be disturbed due to the
impedance mismatch the signals are subjected to in passing
through the connectors.
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A slot between pins 23 and 24 on the rear connector
identifies the PG 502 as a member of the signal source
family. A barrier may be inserted in the corresponding
position of the power module jack to prevent other than
signal source plug-ins from being used in that compartment.
This protects the plug-in should specialized connections be
made fo that compartment. Consult the Building A System
Section of the power malule manual for further informa-
tion.
DEFINITIONS OF PULSE CHARACTERISTICS
The following is a glossary of common pul~l characteris-
tics used in this manual. They are illustrated in Fig. 1.6.
Amplitude. The maximum absolute peak value of a
pulse measured from the baseline regardless of sign, and