7–7
TIMEBASE EXTERNAL — appears when an External clock mode is chosen.
Sampling
This menu is inactive when the external sample clock is being used.
Only single-shot acquisition is available (see below).
Sample Clock
For selecting a description of the signal applied to the EXT BNC
connector for the sample clock up to 100 MHz. The rising edge of the
signal is used to clock the ADCs of the oscilloscope. The effective
thresholds for sampling the input are
*
:
ECL..................................... −1.3 V
0V ....................................... 0.0 V
TTL...................................... +1.5 V
(With CKTRIG Option ONLY) RP (Rear Panel) specifies that
the 50–500 MHz external clock connected to the rear panel be
used as the sample clock (see CKTRIG Manual for details).
External
To select the input coupling for the external clock signal.
Sequence
Offers Sequence Mode. The corresponding knob is used to adjust the
number of segments. Neither the trigger time stamps nor the AUTO
sequence time-out feature are available when the external clock is in
use. Nor is the inter-segment dead time guaranteed.
Record
To select the desired number of samples for the single-shot
acquisition. See Appendix A for model maximums.
*
External clock modes are available only if the EXT trigger is not
the trigger source.
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