Tektronix CSA8000 Series, Service Manual

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Operating Instructions
2–26
CSA8000 & TDS8000 Instruments and Sampling Modules
Each channel has a SELECT channel button and a yellow channel light. The
button operates as follows:
H
If the yellow channel light is on, the channel is acquiring a waveform.
H
If you press the button and the channel is not currently being acquired (for
any channel or math waveform), then the instrument activates (turns on) the
channel.
H
If you press the button and the channel is currently active as a channel
waveform, then the instrument selects the channel waveform.
H
If the channel waveform is already selected when you press the channel
button, the instrument turns the channel off.
Channel indicator
light (yellow)
SELECT
channel button
UCI optical
input connector
Clock recovery outputs
(optional)
Hold-down
screws (2)
Figure 2–7: Sampling module, 80C01-CR shown
The optical input connector uses a universal connector interface (UCI) that
allows use of many standard fiber-optic female connector styles. Some of the
standard UCI interfaces supported are FC, ST, SC, and DIN. (Refer to a current
Tektronix catalog for details.)
Optional clock and data-recovery circuitry provides clock and data outputs; the
recovered clock is also internally routed to the main-instrument trigger circuit.
The circuitry also provides front-panel outputs: normal and complemented clock,
and normal and complemented data (80C02 has data, clock, and 1/16 clock
outputs). Use 50
W
terminations, provided with your optical sampling module, on
unused outputs.
You can disable the internal recovered clock from being used as the main
instrument trigger by selecting external or internal clock triggering; select the
recovered clock rate without actually selecting recovered clock as the trigger
source in order to activate the front-panel clock recovery signals.
Channel Selection
Optical Input Connector
Clock Recovery Outputs