Tektronix TLA7PG2 Service Manual page 68

Theory of Operation
Variable Probe
The P6475 variable probe is available for use with the pattern generator. The
variable probe includes the A80 Variable board.
The Variable probe contains the following circuits:
Input Latch,The Input Latch circuit latches the channel data through the probe
cable from the A50 board. At the rising edge of the clock signal, data is latched
into Bank-A. Bank-B is not available for the A80 Variable board.
Output Latch. The Output Latch circuit latches the data from the input circuit to
achieve simultaneous output of all data from every probe channel, regardless of
what channel mode is used.
Delay . The Delay circuit supports variable delay for CH6 and CH7.
CH6, 7 Mix. The CH6,7 Mix circuit supports logical function between CH6 and
CH7.
Pin Driver. The Pin Driver circuit supports variable output voltage and drives the
DUT.
Event Input. The Event Input circuit routes the external event input signal from
the probe output connector to the A50 PG board.
Sensor. The Sensor circuit senses the inner temperature of the probe to detect
overheating and then reports the findings to the CPU.
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TLA7PG2 Pattern Generator Module Service Manual