Tektronix 7D20 User manual

GUIDE

070-
USER
3
Ό 5- Ό
Ρ
42
TEK
PR
OG
RA MM A BLE
DIGITIZ ER
Te k tro n ix .
CO MM ITT ED TO EXC ELLEN C E

Intro d uction
T h is r eference gui de is inten d e d to h el pα user to o p erate
t he 7D20 . Settings an d comman d s are explaine d briefly
andα page number in t he 7D20 O p erator's Manual is given fo r
obtaining furt h er information .
Copyright©1982, Tektronix, Inc . All rights reserved .
Contents
of this p ublication may not b e reproduced in any form without the
written p ermission of Tektronix, Inc .

F ront P anel Settings
S h ift
F
unctions
2-92
f : S h ift fu n ction allows access to
functions h ig h lig h te d in orange .
Push `f' t h en function key .
V ertical Am p lifier 2-92
V O L TS/DI
V :
Sets vertical sensitivity
in 1,2,5 se q u ence from 5m V /Div to 5 V /Div
.
V A R IA BLE : Continuously variable to at least 12 .5 V olts/Div
.
CO U PL I NG : AC ; P rovi d es AC cou p ling of in p ut signal .
DC ; P rovi d es DC coupling of
input signal .
G ND ; Sets VZ R ( V ertical Zero R eference)
for t h
e
d igitizer .
I NV E RT : Inverts signal connecte d to C
h annel 2 .
P OSITIO N : A d j usts position of trace vertically ± 10 d
ivisions from center
g r aticule .
Time B ase Controls 2-96
Τ / ΜΕ /DI V : Sets h orizontal swee p spee d in 1,2,5 se q uence from 50
ns/Div
to
20s/Div an d selects
ΕΧΤ C L OC K .
P OSITIO N : Positions waveforms h orizontally .

Trigger
Co
n trols
2- ιο 3
S
L
O
P
E :
T r igge r on p ositive (w h en illuminated) or negative slo p e .
LEVEL : Sets t r igge r level .
TR
IG POS :
A d j usts for 0 to 1500 d ivisions p ost-trigger .
TR IG POS ρ : Ad j usts for 0 to 10 d ivisions p retrigger .
Trigger Source
2-99
MOD E : Trigger source set by Ac q uire Mo d e .
CH 1 :
Triggers
on C
h annel 1 input signal .
C H 2 :
Triggers
on C h annel 2 in p ut signal .
L I
NE :
Trigge r s on mai n f r ame line fre q u ency .
EXT . Triggers on exte rn al t r igge r inp u t (±1 V max) .
f,
ΕΧΤ
=10 :
Triggers on external trigger in p ut wit h 10 Χ attenuatio n
(±10 V max) .
Trigger
Cou p
ling
2-
ιοο
AC :
AC cou p les trigger signal (-3d B at 30 H z nominally .)
LF REJ : AC cou p les trigger sig n al (-3d B p oint at 40 kH z nomi n ally .)
HF REJ : Sets h ig h fre q uency (-3d B p oint at 40 kH z nominally .)
DC : DC cou
p
les trigger
signal .

Trigger M ode 2- ιοι
Ρ -P : Triggers at α % of p ea k -to- p ea k trigger or free runs w h en no
signal present .
A U TO : Triggers
on
a d e quate signal level or free runs .
N
O
RM :
Swee p is generate donly on ad e q uate trigger
.
U se for re p etitive
signals below 30 Hz .
H
O
LD
NEXT : Terminates ac q uisition at en d of next
waveform
ac q
uisition .
Acquire M ode 2-95
C
H
1-1 : Ac q uires signal from C h annel 1 V
ertical into
M
emory 1 .
BOTH : Ac qu
ires signals from C h annel 1 an d C h annel 2 into M
emories 1
an d2 res p ectively .
ADD : Ac q uires
the sum of C h annel 1 an d C h annel 2 into
M emory 1 .
CH 2-2 : Ac q uires signal
from C hannel 2 V ertical into M emory 2 .
M emory Display 2- ιο 5
1-6 :
Disp lays contents of W aveform M emories 1-6 .
CO P Y : Co p ies co n tents of
one memory into anoth er .
εχΑΜΡτ .
ε : `CO
P
Y 1-)6' places waveform from M emory 1
into
M emory 6 .

M emory Dis p lay
(cont
i nued)
CS W :
Selects cursor
waveform .
EXAMPLE : 'CS W 3' sets W aveform 3 as t h e Cursor W aveform for
mo d ifying an d ma k ing
c ur so r measurements .
f, REF : Wh en Cursor W avefo r m is ίη ' ΝΜΑ
G'
or' V
S,' causes unmag n ifie d
ΥΤ d is p lay of Curso r W aveform .
Cursor W aveform Controls
2- ιο 8
VX PD
:
Curso r W
aveform is ex p ande d to t h e next more sensitive vertical
setting in 1,2,5 se q uence .
V
C
MP : Cu r sor W avefo r m is
com
p
ressed to t h e next less sensitive vertical
setting in 1,2,5 se q uence .
HM AG : Causes α ten times h
orizontal magnification of t h e Cursor
W
aveform .
f, HM AG A LL : Causes α ten times h
o
r izo n
tal magnification of all store d an d
d isplaye d waveforms .
VP LI P : P ositio ns t h e C u rsor
Waveform u p war d on t h e C RT d isplay .
VP DN :
P
ositio ns the Cursor W aveform d ownwar
d on t
he
C
RT
d is p lay .
VS : P uts 7D20 in X
-Y mo
de
wit
h
t
he
Cursor W avefo r m as Υ an d any
ot
h
er waveform as Χ .

EXAMPLE
:
Wh en VS is p r esse d , `CS W 1 V S
#'
is d is p laye d . T h e
user t h en enters α number from 1 to 6 .
Cursor Controls 2- ιι 2
α
1 :

P ositions Cursor 1 to t h e left .
1 C> :

P
ositions Cursor
1
to t
h
e
rig h
t .
α
2 :

P ositio n s Cu r sor 2 to t h e left .
2C>
:

P ositions Cursor 2 to t h e rig h t .
f,
ΔΟΝ : Turns on
Cursor
2 .
f Δ O
FF :
Turns off Cursor 2 .
f, I ND EP : Allows eac h waveform to maintain in d epen d ent cursor p ositions .
f, A LIG N : Aligns cursors on all waveforms to t he c u rsor p ositions on t he
Cursor W aveform
.
W aveform P
rocessi
n g
Controls 2- ττ 5
SET N :

Determines value of 'N' for use wit h `A VE ' an d `ENV' controls . ` Ν ' is
set in p owers of 2 from 8 to 256 .
A
V
E : I n coming signal is average d until terminatedby' H O L D' or ` H O L D
NEXT' .
ENV :
Continuous envelo pe of t h e incoming signal is d is p laye d until
terminatedby' H O L D' or ` H O L D NEXT' .
f, A VE Ν : Averages ` Ν ' waveforms t h
en enters
H
O
L D .

W aveform P rocessing Controls (Cont i n u ed)
f,
ENV Ν : E nvelo p es ` Ν ' waveforms t hen enters H O L D .
H O
LD
:
Termi n ates acq u isitio n s imme d iately .
VE CTO R : Tur n s vectors j oining ad j acent d ata p oints ON or O
FF
S p ecial F unctions
2- ι2 ο
ID :
Pr oduces α s p ecial G P I B a n d i n strument i d entificatio n menu
w h ic h is use d to select G P I B system p arameters .
R
QS :
Ge n erates α service re q uest (S RQ) .
f, R QS
# :
Generates SR Qs wit h uni que event codes .
P
us
h R
QS# and α
n u mber from 1 to 6 .
PR O BE
ID EN TI F Y : P us h ing t h ep robe i d entify b utton on α Ρ 6053 Β P robe will
gene r ate an S R Q wit h α uni
que
event code for eit
h
er C
h
annel
1
or
C h annel 2 .
M enu Driven F unctions
2- α 3
P
ress t h e MEM O
RY DIS
PLAY buttons to ma k e t
h
e
menu
selections .
MENU :
Dis p lays t h e followi n g me n u :

M AST ER MENU
1,#
STO RE
PANEL #
2,# RE CA LL
P
A NEL #
3, DIS PLAY
CA
LP ATT ERN
4, U TI L ITI
E
S
1,# STO RE PA NEL
# :
Stores t h e current front p anel settings in α
user
selectable, non-volatile settings memory location (1-6) .
2,# RE CA LL P A NEL
#
: R ecalls an d imme d iately im p lements any
one of t he front panel settings p r eviously store d using t he STOR E
PA NEL f u nction .
3, DIS PLAY CA L P ATT ERN : Dis p lays α calibration p attern on t he
C RT to allow corrections to t h e 7D20's d is p lay p resentation
.
P ress button 4 to d is p lay t h e following U tilities Submenu :
U TI L ITI ES
1 S EN D CS W ASCII
2 SE ND CS W B I NA RY
3 RE ADO UTON/OFF
4 ΕΧΤ C L OC K P O L A R ITY
5 IN IT FR O NTP A NEL
6 M AST ER MENU
1 S EN D CS W ASCII : Sen d s t h e Cursor W aveform p reamble a n d
d ata p oints
to another d evice in
LIST
EN ONL Y mo de . 7D20 must
be in TALK O NL Y mo de . Data e n co d ing is ASCII .

M enu-Driven F unctions (Co n t inu e d )
2 S EN D CS W B I NA R Y : Same as #1, exce p t t h at d ata p oints
encoding is b inary .
3 RE ADO UT ON/OFF : Tu r ns text d is p layed
on
lines 1,2 an d
15,16
on an d
off .
L ines 3-14 are always available to d is p lay me nus or
text .
4 ΕΧΤ C L
OC
KP
O
L AR ITY :
Determines w
h
ic
h
transition (+ or -)
of t h e E xternal Cloc k will be recognized by t h e 7D20 w h en ΕΧΤ
C L OC K is selecte d .
5 ΙΝΙΤ FR
O
NT P A NEL :
Initializes front- p anel settings to t h e
following con d itions ;
V
ER TICA L
VO L TS/ D 1 V :1
CO UPL I NG : AC
C H 2 I NVER T : O FF
T R IGG ER I N G
M
OD
E : Ρ - Ρ
H O L D
NEXT OFF
CO UPL I N G : AC
SOUR CE : M OD E
S L O PE : P OS
P OSITIO N : 0