Tektronix DD 501 User manual

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REV . A, NOV 1975
SECTION 1

OPERATING INSTRUCTIONS
Installation

1-1
Signal Connection

1-1
Triggering

1-1
FRONT-PANELCONTROLS, CONNECTORS,
AND INDICATORS

1-2
SECTION 2

SPECIFICATION
SECTION 3

THEORY
OF
OPERATION
BLOCK DIAGRAM
DESCRIPTION

3-1
CIRCUIT OPERATION
TRIGGER CIRCUIT

1

3-2
COUNTER CIRCUIT (SN 8020530-up)

2

3-2
COUNTER CIRCUIT (SN 8020529 and below)

2

3-5
POWER SUPPLY
&
TRIGGER
INDICATOR

3

3-7
SECTION 4

MAINTENANCE
FUSE REPLACEMENT

4-1
TABLE 4-2 . Rear Connector Pin Assignments

4-1
SECTION 5

PERFORMANCE CHECK/CALIBRATION
PRELIMINARY INFORMATION

5-1
Test Equipment Required

5-1
INDEX TO PERFORMANCE CHECK/CALIBRATION

5-3
START" AND EVENTS INPUT

5-4
START AND EVENTS TRIGGERING

5-6
SECTION 6

ELECTRICAL PARTS LIST
OPTIONS
SECTION 7

DIAGRAMS
SECTION 8

MECHANICAL PARTS LIST
CHANGE INFORMATION
Page

DD 501
r~
EVENTS
DELAY COUNT
EVENTS

START
,-

pu '
`_

TR16T)

POWER

TR16'D

~~!= v`"
Ou7 +
IEYEI
S_

S
IEYEI
O
Y ~L,,

RESET
0
i IEVEI

LEVEL
IN/OUT
IN/OUT
TRIG'D
olro
uvuT

TT+IS our

Iwur
:u
Fig . 1-1 . DD 501 Digital Delay .
VIEW

TIC VIEW
rE~nwowuca

DD 501

OIGITAI DELAY
REV . A,
NOV 1975

The DD 501 Digital Delay is an events counting plug-in unit designed for use in a TM 500-Series Power Module
mainframe . Separate external trigger signals are connected to the EVENTS and START I NPUT connectors which allows up
to 99999 events to be counted . The plug-in unit counts a predetermined number of events, from 0 to 99999, which are
selected by
the
front-panel thumb-wheel switches . The last event counted generates a trigger pulse to the DLY'D TRIG
OUT connector on the front panel .
Installation

High-level, low-frequency signals can
be connected
The DD 501

is calibrated and ready for use when

directly to the external trigger inputs with short, unshield-
received . It is designed to operate in any compartment of a

ed leads
.
When this method is used, establish a common
TM
500-Series Power Module only
.
To install, align the

ground between the DD
501
and the
associated equip-
upper and lower rails of the DD 501 with the Power

ment . The common ground provided by the line cords
is
Module tracks and fully insert it . The front will
be flush

usually inadequate . If interference is excessive with
with the front of the Power Module when the DD 501 is

unshielded leads, use a coaxial cable or probe .
fully inserted .
OPERATING INSTRUCTIONS
To remove the DD 501, pull
on
the latch at the
bottom of
the front panel and the DD 501 will unlatch . Continue
pulling
on
the latch
to slide
the
DD 501 out of the Power
Module . See Fig . 1-2 .
Signal Connection
The
DD 501 utilizes do coupling into the EVENTS and
START trigger INPUT
connectors . In general, probes
offer the most convenient means of connecting signals
to
the DD 501 trigger inputs . Tektronix probes are shielded
to prevent pickup of electrostatic interference . A 10X
attenuation
probe offers a high input impedanceand
allows the circuit
under test to perform very close to
normal operating conditions . Also, a 10X probe attenuates
the input signal 10 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, which require max-
imum overall bandwidth, use a coaxial
cable terminated at
the output end in the characteristic impedance of the
source . 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 . A, NOV 1975
INTRODUCTION
The front-panel output signal from
the
DLY'D TRIG
OUT connector should
be connected to
other equipment
with 50 ohm coaxial cable . The cable should be terminated
in 50 ohms to maintain the risetime and falltime
characteristics of the signal .
Triggering
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
RELEASE
LATCH
0o so,

wartu oE~,
Fig . 1-2 . Release latch .
Section 1-DD 501
181A-10

Operating
Instructions---DD 501
applied to a trigger circuit where they are converted to

count at which
a delayed pulse will occur
.
This switch
pulses of uniform amplitude and shape . This makes it

selects the number of events
to be
counted . The
delay
possible to start the delay with a pulse that has a constant

count is displayed on the front-panel switch readout . The
size, eliminating variations of the delay circuit operation

DLY'D TRIG
OUl" signal is delayed 1 count more than the
caused by changing input signals . l - he trigger controls

EVENTS DELAY COUNT switch setting ; that
is, a
switch
provide a means to select the START and EVENT pulses at

setting
of
00000 will count 1
event pulse, or a switch setting
any voltage level on either slope of the waveform .

of 99999 will count
100,000
event
pulses to produce a
DLY'D TRIG OUT pulse .
The trigger SLOPE and LEVEL controls determine the
slope and voltage of the input signal where the trigger

INPUT Connectors
circuit responds . Generally, the best point on a waveform
for triggering is where the slope is steep, and therefore

individual front-panel
connectors are provided for
usually

free

of

noise .

Assuming

a

sine-wave

input

connecting the external trigger signals to the EVENTS and
waveform, the steepest slope occurs at thezero-crossing

STAR1`
trigger preamplifiers .
point . ~hhis is the point selected for triggering with the
LEVEL control
is set to 0 (center)
. A
more positive or
negative point on the waveform is selected as the LEVEL

EVENTS
and
START
SLOPE
Switches
control is rotated clockwise or counterclockwise respec-

Determine the
amplitude point on the trigger signal at
tively from 0 (toward +- or -- symbols on panel) .

which the circuit triggers . In the fully clockwise detent
position, the circuit triggers at the amplitude point on the
trigger signal selected by the PRESET screwdriver adjust-
Before setting the trigger level, the desired slope

ment .
should be selected . Adjust the START LEVEL control to
the desired start trigger point . Then adjust the EVENTS
LEVEL control 4o trigger the events pulse either

LEVEL IN/OU1f°
Connectors
simultaneously or after the start trigger pulse . The
relationship

between

start

and

events

triggering

is

Individual front-panel pin jacks are provided to monitor
monitored at
the S -
FART
and EVENTS TRIG VIEW con-

the EVENTS
and START do level at which the triggering
vectors
.
occurs
.
Either LEVEL
control can be preset to a fixed voltage
level by adjusting the front-panel PRESET
adjustment
.
Rotate either LEVEL control fully clockwise (into the
detent), and set the PRESET' screwdriver adjustment to
the desired triggering voltage level .
~ON~"-P'AaN~I~ CONTROl~~,
CONNECTOI~~,
~N

INOICA,TOI
NO 1~E'
EVENTS TRIG'D Indicator
Provides a visible indication that the Events circuit has
received a trigger,
and that an adequate trigger signal is
applied .
START TRIG'D Indicator
Provides a visible indication that the Start gate circuit
has received a trigger, and is open, ready for the
events
count to begin .
See Fig . 1-3 for location
and brief description of

RESET Pushbutton
front-panel controls, connectors,
and indicators .

A
front-panel RESET button
is provided to clear the
EVEN
- ~S
counter
and reset the START circuit . The next
EVENTS DELAY COUNT
Switch

START pulse will restart the EVENTS
count at 00001 .
"T'he
RESET pushbutton allows the operator to reset the
The EVENTS DELAY
COUNT switch is a 5 decade,

counter
and start circuit when in long term count cycles or
digital readout switch that increases or
decreases the

when a false trigger occurs .
Digitally signed by
http ://www .aa4df .co
m
REV . A, NOV 1975

REV . A, NOV 1975
15

SLOPE . Selects EVENTS trigger polarity .
ercwrs ocur couwr
EVENTS DELAYCOUNT .
Selects number of events to be counted .
RESET .
Restarts count cycle .
O
TRIG'D . Indicates START gate triggering .
SLOPE . Selects START trigger
polarity .
Operating
Instructions-DD 501
LEVEL and PRESET . Selects the
amplitude point on the trigger signal where the START circuit triggers .
Allows trigger point to be preset
(screwdriver adjustment) when LEVEL control is in fully clockwise detent
position .
O
LEVEL IN/OUT . Provides an output to monitor the do level
at
which the
START trigger occurs .
O
INPUT . Provides a means of connecting the external trigger signal
to the
START trigger
preamplifier .
O TRIG VIEW . Allows viewing of shaped trigger pulses
to START latch circuit .
O
TRIG VIEW
. Allows viewing of shaped trigger pulses to EVENTS counting circuit .
10

DLY'D TRIG OUT . Provides an output of the delayed trigger
pulses .
11

TRIG'D . Indicates a delayed trigger
output
has
occured .
12

INPUT .
Provides a means of connecting the external trigger signal to the EVENTS trigger preamplifier .
13

LEVEL IN/OUT . Provides an output to monitor the do level
at
which
the EVENTS trigger occurs .
LEVEL
and PRESET . Selects the amplitude point on the trigger signal
where the EVENTS circuit triggers .
Allows trigger
point to be preset (screwdriver adjustment) when LEVEL
control is in fully clockwise detent
position .
TRIG'D . Indicates EVENTS circuit has received a trigger .
17

POWER . Pilot Light indicates power applied .
Fig . 1-3 . DD 501 front
panel controls and connectors .
isle-

Operating Instructions--~DD 501
~'FiIG VIEW
Connectors

are generated as positive-going rectangular pulses coin-
Individual front-panel probe-tip connectors are provid-

cident with the end of the delay interval . The DLY'D TRIG
ed for
monitoring the EVENTS and the STAR~f trigger

OU - T Pulse width will be identical to the
Schmitt-trigger
pulse waveforms . The TRIGVIEW output
signals are a

Pulse
width, which can be monitored at the front-panel
TRIG VIEW connector .
representation of the input trigger signals repetition rates .
The TRIG VIEW output pulse width is determined by the
input waveshapeand the triggering voltage level . For
example, the
sinewave EVENTS INPUT signal, triggered

The displayshown in Fig . 1-5 illustrates the relationship
between the EVENTS
INPUT signal, TRIG VIEW pulse,
at the amplitude point shown in Fig . 1-4,
produces an

and the DLY'D TRIG OUT pulse, with the EVENTS DELAY
output trigger width of 5 microseconds . Consequently,

COUNT switch set at 00002 .
varying
the trigger amplitude point on the input waveform
will vary the output pulse
width proportionally .
DLY'D ~°f~IG OUP' Connector

DELAYED "TRIG'D
Light
Provides a means of applying the shaped
delayed

Provides a visible indication when a delayed trigger
trigger pulses to associated equipment . Output signals

output has occurred .
EVENT'S
INPUT
SIGNAL
TnIG
VIEW
QU'iPUT
SIGNAL
Fig . 1-4 .
Delayed
output pulse width
vs . events input-signal

Fig . 1-5 . Time and pulse-width relationships between input and
trigger voltage level .

output signals .
REV . A, NOV 1975

The
following electrical characteristics are valid
over the stated environmental range for instruments
calibrated at an
ambienttemperature
of
-
.--20°C to -i-30°C, and after a 5-minute
warmup unless otherwise noted .
Limits and tolerances given in
the Supplemental Information column are provided for
user information only, and
should not be interpreted as Performance
Requirements .
EVENTS and SlJART
LEVEL Controls
REV . A, NOV 1975
Capacitance
Trigger Level Range

1 .0 V to -I-1 .0 V
_ .- ._,-- ._ .d .~ . . .A__ .____ ._ .__ .________ . ._~ ._,__~
.-____~ _ . ._ . .

____~
Frequency Response

0
to 65
MHz
____ . ._ .

.~ . .__F

______ ._______ . . .___ .-_a________ . .__ .
Pulse
Width (minimum)

~ 5 ns
IN~~iODUC°TION
"i`ABLE 2-1
Electrical
Characteristics
Characteristic

~

PerformanceRequirement
Input Resistance and

~

~

1 MS2 paralleled with
20 pF (variable)
Slope

~ + or --, selectable
Sensitivity

85 mV p-p minimum at 30 MHz ; 120 mV
p-p minimum
at 65 MHz
__ . . ._____
. .__._ . ._ . .,__ .~_________ ._ .__

_~ ._
._________ .,__ ._ .e .________,_ . .__ ._ . . ~-

. .~

_
TRIG VIEW vY Output

At least 0 .5 V ~_ .
_
-~

----_~ Permitsviewing
of all shaped .v triggers
Sourc e Impedance

~

~ 200 S2 or less
Trigger LEVEL IN/OUT Monitor

Probe-tip
jack- allows monitoring
Jack

comparator voltage
of preset or trigger
level to within 25 mV .
Source
Impedance

~

~
Approximately 1 kf2
TRIG'D Indicator
EVENTS
START

~ Visual indication that start gate is open
Visual indication of triggering
0 Volt
l`~rigger Level

~

~
Within 30° of mechanical zero
START Pulse Lead Time

I

I Simultaneous or ahead of the EVENTS
pulse
Section 2~---DD 501
Supplemental Information
Recycle Time

150 ns or less

~ Paralleling START
and EVENTS
INPUTS determines maximum -
N
-i-
1
frequency

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