Tektronix 7D11 User manual

Tektronix, Inc.
070 -1 329 - 00
TEKTRONIX ®
7011
DIGITAL DELAY
OPERATORS
)-
INSTRUCTION MANUAL
P.O. Box 500
Beaverton, Oregon 97005
772

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•
WARRANTY
All TEKTRONIX instruments are warranted against
defective materials and workmanship for
one year. Any
questions with respect
to the warranty should be taken up
with
your TEKTRONIX Field Engineer or representative.
All requests for repairs and replacement paru should be
directed to the TEKTRONIX Field Office or representative
in your area. This will assure you the fastest possible
service. Please include the instrument Type Number or Part
Number and Serial Number with all requests fOf" parts
Of"
service.
Specifications and price change privileges reserved.
Copyr.,t @ 1972 by Tektronix. Inc.. Beaverton, Oregon.
Printed
in the United States of America. All rights reserved.
Cont ents of this publication may not be reproduced in any
form
without permission of Tektronix, Inc.
U.S.A. and foreign TEKTRONIX products covered by U.S.
and foreign patents and/ or patents pending.
TEKTRONIX is a registered trademark of Tektronix. Inc.

SECTION 1
SECTION 2
L
L
®
TABLE OF CONTENTS
OPERATING INSTRUCTIONS
7011 Features
Preliminary Information
Installation
Display
Controls and Connectors
General Operating Information
Signal Connection
Count Mode
Trigger Controls
Triggered Light
Trigger Coupling
Trigger Source
Trigger Slope/Level
Events Start Trigger
Delay Time or Events
Fine Delay
B Sweep Delay Mode
Output Signals
Front-Panel
Output Signals
Output Signals to Mainframe
Operating Modes
Sweep Delay
Echo Delay Time Mode
Applications
General
Delayed-Sweep Time Measurements
Displaying Complex Signals with Delayed Sweep
Pulse
Jitter Measurements
SPECIFICATION
Introduction
Table 2-1, Electrical Characteristics
Table 2-2, Environmental Characteristics
Table 2-3, Physical Characteristics
Page
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Fig. "" 701 1 Di git a lO elav.

Section 1-7011 Operators
OPERATING INSTRUCTIONS
7011 Features
The 7011 Digital Delay plug-in unit is designed for use
with TEKTRONIX 7000-Series Oscilloscope mainframes
equipped with a readout system. The 7011 uses the
readout system to display the selected delay count on the
CRT. A delayed trigger output is generated by counting
time or events. Digital delay time to one second is read out
in 100-nanosecond increments. Additional analog delay
time from zero to 100 nanoseconds selected from a
calibrated front-panel dial provides
added resolution. An
"echo" time-delay mode provides a divide-by-two scaler to
read out the "one-way trip" time up to two seconds for
radar ranging and TOR applications. Delay time accuracy is
controlled by an internal crystal oscillator; greater accuracy
can be
obtained by the use of an external one-megahertz
standard. In the Count by Events mode, the CRT readout
displays the integer number of events from one to 10
7
events at count rates up to 50 megal:lertz.
The 7011 can be used to delay a 7B-series time-base unit
in either a runs-after or triggerable-after delay time mode.
Other 7011 features include on-screen display of delay
interval by vertical signal
or display blanking, trigger
pickoff from vertical amplifier unit, and blanking of all
zeros
to the left of the most significant digit (Count by
Time mode only).
PRELIMINARY INFORMATION
Installation
The 7011 is designed to operate in any plug-in compart-
ment of TEKTRONIX 7000-series mainframes. However,
certain modes
of operation require the 7011 to be installed
in a specific
compartment. The unit must be operated in a
horizontal
compartment to trigger from a signal applied to
®
a vertical amplifier unit. The 7011 must be operated in the
A Horizontal compartment to control the delay mode of a
time-base
unit in the B Horizontal compartment. Operation
in a vertical compartment is necessary to view the Delay
Interval Pedestal without the use of external cables.
To install the 7011 into a plug-in compartment, push
the unit in until it is seated flush against the front panel of
the mainframe. To remove, pull the release latch to
disengage the 7011. Continue to pull the release latch to
remove the unit from the mainframe.
Display
The 7011' readout display is presented on the CRT of
the mainframe, along with information encoded by the
other plug-in units. Digital delay time (in milliseconds) is
displayed in four to eight digits. All zeros to the left of the
most significant digit are blanked out. The + symbol to the
right of the digital display reminds the operator to add any
analog delay time selected by the FINE DELAY (ns) dial to
the delay time. The number of events being countecJ is
presented in a seven-digit display.
The 7011 readout display appears on the CRT in a
location corresponding
to the plug-in compartment used.
The delay time or number of events will be displayed in the
top division of the CRT graticule. The delay-time measure-
ment unit (ms) will be displayed in the bottom division. It
is not necessary to select the 7011 with the mainframe
Vertical
or Horizontal Mode switches to view the digital
display.
In order to view the Delay Interval Pedestal
waveform, selection with
the Vertical Mode switch is
required.
1-1

Operating I ns tru ctions- 7Dll Operators
Fig. 1·2. 701 1 front ·panel co ntrols and con n ec tors.
' -2

CONTROLS AND CONNECTORS
The major controls and connectors for operation of the
7D11
are located on the front panel of the unit. Two
controls located inside the unit for auxiliary functions are
described in the General Operating Information section.
The front·panel controls
and connectors are identified in
Fig. 1-2;
their functions are as follows:
CD COUNT MODE Switch
Selects mode
of operation and clock-signal
source for Time count mode.
CD B SWEEP DELAY MODE Switch
Selects the delay mode logic
for time-base unit in
B Horizontal compartment
of mainframe.
CD TRIGGER SLOPE/LEVEL Controls
Select slope
and amplitude point of input signal
where the delay is initiated.
CD TRIG'D Indicator
Lights when a trigger is produced.
CD COUPLING Switch
Selects the method
of coupling the input signal
to the Trigger circuit.
CD SOURCE Switch
Selects Trigger
input signal source.
CD EVENTS START TRIGGER SLOPE/LEVEL
Controls
Select slope and amplitude
point of input signal
where the Events Start count is initiated.
CD DELAY TIME OR EVENTS Control
Selects delay
time or number of events counted.
Direction
of rotation selects increase or decrease
in delay time or number of events.
CD FINE DELAY (ns) Dial
Selects analog delay
time added to digital delay
time selected by DELAY TIME OR EVENTS
control.
Operating Instructions-7011 Operators
@ DLY'DTRIGOUT
BNC connector for Delayed Trigger output
signal.
® EXT 1 MHz IN or EVENTS START TRIG IN
BNC connector for input of external 1 MHz
time-reference signal
or input of Events Start
Trigger input signal. Connector function is deter-
mined by setting of COUNT MODE switch.
® DLY INTERVAL OUT
BNC connector for Delay Interval output signal.
® EXTTRIG IN
BNC connector for external input to Trigger
circuit (selected by SOURCE switch in the
external positions).
RESET
Resets the DELAY TIME OR EVENTS to
0000001 (EFF SN B030000 and up).
GENERAL OPERATING INFORMATION
Signal Connection
In general, probes offer the most convenient means of
connecting signals to the 7D 11 external trigger inputs.
TEKTRONIX probes are shielded to prevent pickup of
electrostatic interference. A 10X attenuation probe offers a
high
input impedance and allows the circuit under test to
perform very close to normal operating conditions. Also, a
10X probe attenuates the input signal ten times.
TEKTRONIX probes are designed to monitor the signal
source with minimum circuit loading_ The use of a probe
will, however, limit the maximum trigger frequency range.
To obtain maximum trigger bandwidth when using probes,
select a probe capable
of compensating the input
capacitance; observe the grounding considerations given in
the probe manual. The probe-to-connector adapters
and the
bayonet-ground
tip provide the best frequency response.
In high-frequency applications, requiring maximum over-
all bandwidth,
use a coaxial cable terminated at both ends
in the characteristic impedance of the cable. To maintain
the high-frequency characteristics
of the applied signal, use
high-quality low-loss cable. Resistive coaxial attenuators
can be used to minimize reflection if the applied signal has
suitable amplitude.
REV. JAN 1974 1-3

Operating Instructions-7D11 Operators
High-level, low-frequency signals can be connected
directly to the external trigger inputs with short, unshielded
leads. When
this method is used, establish a c'ommon
ground between the 7D11 and the associated equipment.
The common ground provided by line cords is usually
inadequate. If interference is excessive with unshielded
leads, use a coaxial cable
or probe.
A signal can also be
routed to the 7D 11 through an
amplifier unit via the internal trigger circuitry of the
mainframe (7D11 installed in a horizontal compartment).
This method of signal connection minimizes circuit loading,
especially
when triggering a time-base unit in parallel with
the 7D11. (NOTE: Only external signals can be used with
the Events Start Trigger.)
The front-panel output signals, DLY'D TR IG OUT and
DLY INTERVAL OUT, should be connected to other
equipment with 50-ohm coaxial cables. The cables should
be terminated in 50 ohms to maintain the rise and falltime
characteristics of these signals.
Count Mode
General. Two basic count modes, Time and Events, can
be
performed by the 7D11, as selected by the COUNT
MODE switch.
The delay interval in both modes is selected
by the DELAY TIME OR EVENTS control and is read out
on the CRT.
TIME INT CLOCK. The 7D11 counts precise
increments
of time after the receipt of a trigger. The
TRIGGER controls select and condition the signal to start
the time delay. Accuracy in this mode is determined by an
internal, crystal-controlled oscillator.
TIME EXT 1 MHz. This
count mode is the same as
TIME INT CLOCK except the accuracy is derived from an
external, one-megahertz standard.
EVENTS.
The 7D11 counts events, periodic or
aperiodic, at count rates to 50 megahertz. The EVENTS
START TRIGGER provides a means of discriminating
between
the event that starts the delay and the events to be
counted. The events to be counted are selected and
conditioned by the TRIGGER controls.
Trigger Controls
The input signal may have a wide variety of shapes and
amplitudes, many of which are unsuitable as delay-initiating
triggers.
For this reason, these signals are first applied to a
trigger
circuit where they are conyerted to pulses of
uniform amplitude and shape. This makes it possible to
start the delay with a pulse that has a constant size,
eliminating variations of the delay circuit operation caused
by changing
input signals. The TR IGG ER controls provide
a means
to select the signal source, filter unwanted
frequencies, and start the delay at any voltage level on
either slope of the waveform.
Triggered Light
The TR IG'D light provides a convenient indication of
the Trigger circuit condition. If the TRIGGER controls are
correctly set and an adequate signal is applied, the TRIG'D
light is on. If the TRIG'D light is off, no delay interval is
started. The cause might be an incorrectly set TR I GG ER
control, low signal amplitude, or a signal repetition rate
outside the usable frequency range. This feature can be
used as a general indication
of correct triggering when there
is no display on the CRT. The Delay Interval Pedestal and
Z-Axis Blanking displays also aid in
obtaining correct
TR I GG ER control settings. See the discussion of these
features under Output Signals to Mainframe for further
information.
NOTE
When the 7D11 is used in the EVENTS count mode,
the EVENTS
START TRIGGER affects the output
of the Trigger circuit but has no effect on the
TRIG'D light.
Trigger Coupling
The TRIGGER push buttons located below the COUP-
LING title select the method in which the input signal is
connected to the Trigger circuit. Each position permits
selection or rejection of various frequency components of
the signal used to trigger the delay start.
AC.
In this position of the COUPLING switch, the DC
component of the input signal is blocked. Signals with
low-frequency
components below about 30 hertz are
attenuated. In general, AC COUPLI NG can be used for
most applications. However, if the signal contains unwanted
frequency components or if the delay is to be triggered at a
low repetition rate or DC level, one of the other switch
positions will provide
better results.
'-4
REV. JAN 1974
®I

The triggering point in the AC position depends upon
the average voltage level of the input signal. If the input
signal occurs randomly, the average voltage level will vary,
causing
the triggering point to vary also. This shift of the
triggering point may be enough so it is impossible to
maintain a stable delay start; in such cases, use DC
coupling.
AC LF REJ. In this positIOn, DC is rejected and
low-frequency input signals below about 30 kilohertz are
attenuated. Therefore, the delay is triggered only by the
higher-frequency components of the input signal. The AC
LF REJ
position is particularly useful for providing stable
triggering if the input signal contains line-frequency
components.
AC HF REJ. This COUPLING switch position passes
all low-frequency signals between about 30 hertz and 50
kilohertz. DC is rejected and signals above 50 kilohertz are
attenuated. This position is useful to trigger the delay from
the low-frequency components of a complex waveform.
DC. The DC positIOn can be used to provide stable
triggering from low-frequency or low-repetition-rate signals
which would be attenuated in other modes. It can also be
used to trigger the delay when the input signal reaches a DC
level selected by the setting of the SLOPE/LEVEL control.
When triggering from the internal source, the setting of the
vertical unit position control(s) affects the DC triggering
point.
Trigger Source
The TRIGGER push buttons located below the SOURCE
title select the source of the signal connected to the Trigger
circuit.
INT. In this position, the input signal is derived from
the associated vertical unit. Therefore, the 7D11 must be
installed in a horizontal compartment to use the internal
source. Further selection of the internal signal may be
provided
by the vertical unit and mainframe; see the
instruction manuals for these instruments for further
information.
LINE. In this SOURCE switch position, a sample of the
power-line voltage from the mainframe is connected to the
Trigger circuit. Line triggering is useful when the input
signal is time related (multiple or submultiple) to the line
frequency. It is also useful for providing stable triggering
from a line-frequency component in a complex waveform.
Operating Instructions-7D11 Operators
EXT. A signal connected to the EXT TRIG IN
connector can be used to trigger the delay in the EXT
position of the SOURCE switch. An external signal can be
used to provide a trigger when the internal signal ampl itude
is too low.
EXT +10. Operation in this position is the same as
described for EXT except the external signal is attenuated
10 times. Attenuation of high-amplitude signals is desirable
to extend the range of the LEVEL control.
Trigger Slope/Level
The TRIGGER SLOPE/LEVEL controls determine the
slope and voltage level of the input signal where the Trigger
circuit responds. Generally, the best point on a waveform
for triggering the delay is where the slope is steep, and
therefore usually free of noise. Assuming a sine-wave input
waveform, the steepest slope occurs at the zero-crossing
point. This is the point selected for triggering when the
LEVEL control is set to 0 (center). A more positive or
negative point on the waveform is selected as the LEVEL
control is rotated clockwise or counterclockwise respec-
tively
from 0 (towards + or - symbols on panel).
Before setting the TRIGGER LEVEL, the desired
SLOPE, MODE, COUPLING, and SOURCE should be
selected. Then adjust the LEVEL control so the delay starts
from the desired point.
Events Start Trigger
The Events Start Trigger is used in the EVENTS count
mode to differentiate between the event that starts the
delay and the events being counted.
The EVENTS START TRIG IN connector provides the
input to the events-start signal. The EVENTS START
TRIGGER SLOPE and LEVEL controls select the ampli-
tude point and slope on the input signal where the delay is
triggered.
Generally, the best point on a waveform for triggering
the delay is where the slope is steep, and therefore usually
free of noise. Assuming a sine-wave input waveform, the
steepest slope occurs at the zero-crossing point. This is the
point selected for triggering when the LEVEL control is set
to 0 (center). A more positive or negative point on the
waveform is selected as the LEVEL control is rotated
clockwise or counterclockwise respectively from 0 (towards
+ or - symbols on panel).
®I
REV. JAN 1974 1-5