Delay Time Or Events; Fine Delay; B Sweep Delay Mode; Output Signals - Tektronix 7D11 Instruction Manual

Instructions-7Dll
Operating

Delay Time or Events

The DELAY TIME OR EVENTS control selects the
digital delay time in the TIME count mode, and the number
of events counted in the EVENTS count mode. The delay
time in milliseconds, or integer number of events, selected
is displayed on the CRT readout.
This control is a spring·return·to--center control that
increases or decreases the count at which a delayed pulse
will occur. The direction of rotation determines whether
is
increased or decreased. The rate at which the
the count
count increments is determined by the magnitude of
rotation. After either extreme of the range is reached, the
next count starts from the other end of the range. For
example, if the delay time is increased above
(one second), the count will go to
the delay time is decreased past
go to 1000.0000 ms.

Fine Delay

FINE
The DELAY (ns) dial selects analog delay time
from zero to 100 nanoseconds in the TIME count mode.
This one-turn control provides added resolutioo
digital delay time selected by the DELAY TIME OR
EVENTS control. The delay time selected by the FINE
DELAY (ns) dial is read from the ca librated knob as the
analog delay time is not read out on the CRT. Each minor
division on the dial represents two nanoseconds.
B Sweep Delay Made
B
The SWEEP DELAY MODE switch permits the
under specific conditions, to select the delay mode of a
compatible time·base unit, To use this feature, the 7011 is
installed in the A Horizontal compartment and the time·
base in the 8 Horizonta l compartment of a four·plug·in
mainframe. With this arrangement, the time·base unit can
be controlled through the mainframe interface. Some dual
time·base units are not compatible with this feature; see the
time·base unit instruction manual for further information.
INDEPENDENT, The 7011
opera le independently.
B STARTS A F
T ER DELAY. The time·base unit pro,
duces a sweep immediately following the selected delay
interval. This provides the same mode of operation as
triggering the time·base unit with the delayed trigger
output.
'·6
Operators
1000.0000 ms
0.0001 ms. Conversely, if
0.0001 ms. the count will
10
the
7011.
and the time·base unit
B TRIGGERABLE AFTER
produces a sweep after the first trigger pulse is received
following the selected delay interval. This mode of opera·
tion provides a stable display of a signal having time jitter.
Precision time measurements cannot be made in this mode
because the actual delay time is only partially dependent on
the delay interval of the 7011.

OUTPUT SIGNALS

Front-Panel Output Signals

General. The Delay Interval and Delayed Trigger out­
puts are available at the front-panel DLY
TRIG
and DLY'D OUT connectors respectively. These
outputs can be used to control other equipment during or
immediately following the delay interval. To maintain the
rise and falltime characteristics of these signals, connection
to other equipment should
cable; the output of the cable should be terminated in
ohms,
DLY INTERVAL OUT.
rectangular waveform coincide", with the generated delay
interval. In time mode DLY INTERVAL OUT is approxi·
mately 20·30 ns shorter than indicated delay time because
of internal propagation delays and trigger recognition time.
In the event mode, the DLY INTERVAL OUT is within
30 ns of actual delay, usually'" 10 ns.
DLY'O TRIG OUT. This signal is generated as a
positive-going rectangular pulse coincident with the end of
the delay interval.
The front· panel output signals are shown in Fig 1-3.
along with the input signal. The input signal, Fig. 1-3(A), is
comprised of one- and ten-microsecond time markers. The
7011 is set for a 0.OO38·millisecond delay time after
triggering on the ten-microsecond markers. The resultant
Delay Interval and Delayed Trigger outputs are shown in
Fig. 1·3(8) and (C) ' respectively. The characteristics of
output
these signals are given in the Specification section.
A
B
c
1-3.
Fig, OispllV showir'l(l time relationship of:
(8)
10
the front·panel, Oelav Interul, and
outPUt5.
DELAY. The time·base unit
INTERVAL O U
be
made with 5O-ohm coaxial
50
This output is a positive-going,
lA)
Input signal
ICI
aellved TriYIJ8f
REV B. SEP 1978
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