Lecroy LTXXX-OM-Е, LTXXX-OM-E-Rev-B User Manual

P

P

T

AARRT

O

O

E

NNE

G

T his part of the manual covers the main Waverunner features and explains, step by step, how to use
them. You’ll get to know yourscope and start working with it quickly and effectively. Capture an d view
w av ef o rm s. Zoo mand scro l l. Learnthe ar t of display . Use math andmeasur e m e n t tool s. Document
your work.

G

E

E

T

T

TII

T

N

N

GSS

G

T

T

A

A

R

R

T

T

E

E

D

D

LTXXX-OM-E Rev B ISSUED:January2002 15

C HAPTER O NE:

In this ch apte r, se eho w

To select the input signal channel
To use menus an d con trols for basic operations
To fin dyo urwayaroun d the display
To adjust the timebase, gainand positionof the signal
To zo o m— man u allyand autom atically
To set up the timebase
To set sign alcoup ling
To calibr ate and use the p assiv e pro be
To set up the CAL and BN C outputs

Catcha NewWav e

16 ISSUED: January2002 LTXXX-OM-E RevB

C HAPTER O NE

Catch a NewWave

ViewYo urW avefo rm

Takethesesteps to captureand viewyour signal;set timeand voltsper division; zoom and auto-scroll:

1. Connect y our signal to the W a verunner (Channel 1 input for this example) .

AUTO

SETUP

2. Press the blue
for display of the input signal. Press it again to confirm the action.

buttonto automatically set the(E dge)trigger level, timebase, andvertical settings

3. Press

1

to se lect CHANNEL 1 an ddispla ythebasic W a v erunner men u s .

4. Use these menu s in the steps on the follow ing pages to adjust the signal’s trace
on the screen.

To turn Channel 1 on or off.

To access the CHAN NE L Coupling menus. See page 24.

To automa ticallymak ea zoomedtraceof the signa l. Use thevertical
POSITION knob to movethetraceso tha t it is cle a rly visible. Use the
ve rtical ZOOM kno bto adjust its exp a n sionvertically. Seepage22.

To automatically set gain and offset, and “find” the signal.

To select fix ed or variable ga in. Select “variable” to control the channel’s
gain continuously . See page 20.

: WithAUTO SETUP yo ucan autom aticallyset

TTIIPP:

up signals in the 5 mV to 40 V range with a
frequency of ≥≥≥≥50Hz and a duty cycle

as sm al l as 0 .1%.

TTIIPP:

:Press

1

channel on or off.

tw i ceto turnth e

To sele ct thegrid styleand num b e r.Next page : Sing le
grid. See also Chapter 3, “ D isplay Your Signal.”

LTXXX-OM-E Rev B ISSUED:January2002 17

P ART O NE: GETTING STARTED

TOF

IN DYOURWAY AROU N D T H EWAVERUNNERDISPLAY

Real-T ime Clock field:

displays the curren t date and time.

Displayed T race L abel

time/ div and volts/ div set t ings, and cursor readings where appropriat e.

Acqu isiti on Summary field:

attenuation, and coupling for each channel, with the selected
channel highlight ed.

powered by a batte ry-backed real-time clock, it

indicat es each channel or channel displ ayed, t he

timebase, volts/ div, probe

18 ISSUED: January 2002 L TXXX-OM-E Rev B

C HAPTER O NE:

Catch a NewWave

Trigger Level

the trigger voltage level relative to ground level.

Trigger Delay

Trigger Status field

(A U T O, N OR MA L , S IN GL E , S T OPPE D). T he small square icon flashes
to indicate that an acquisit ion has been made.

Trigger Configuration field

trigger, and information on the trigger’s source, slope, level and cou plin g, and
other in form ation when appropriate.

Trace and Ground L evel

mar k er.

Other display areas inc lude the
time and frequency relativeto cursors, and a
specialmessages.Formoreaboutthedisplay,seeChapter3,“DisplayYourSignal.”

USE TIME / DIVT O ADJUST T HE T IME BASE

Time and Frequency field

TIME / DIV

arrows on both sides of the gridthat mark

is an arrow indicating the t rigger time relative t o t he trace.

shows sample rat e and t rigger re-arm ing status

cont ains an icon indicat ing the t ype of

show s the trac e nu m ber and ground level

, located below thegrid and stating

M essag e field

placed above the grid and reserved for

NNOOTTEE:

:AUTO SETUP operates only
on channels that are turned on,
unless no channels are turned on.
T hen all channels will be affected.

sns

When more than one channel is
turned on, the first channel in
numerical order with a signal

5. Tu rn

to adjust the timebase as desired.

app lie d to it will be autom atically
set upforedgetriggering.

Thetime per division is se t in a 1–2–5 seq u ence. W averunne r automa ticallyada p ts itse lf to u sethemax im u m
samplingratewhenever thetimebaseis changed. Theselected time/div settingis shown in thetracelabel at the
topleft portionof thescreen,and thesampling ratein thetrigger statusf ieldat thebottom right-handcorner.

LTXXX-OM-E Rev B ISSUED:January2002 19

P ART O NE: GETTING STARTED

ADJUST SENSITIVITY AND POSITION

VOLTS / DIV

VmV

6. Turn
sen sitivity. The volts/ div setting is show n in the
Channel 1 trace label.

The next two steps can be taken (if not already ) w hen you
wishto finetunethevertical gainand get abetter vertical
resolution:

7. Fine tune the vertical gain by selecting “variable” from
theGainmenu(seepage17).

8. Now turn the VOLTS / DIV knob through several
completerotations, sothat theentiresignal reaches
fromtopto bottomof the grid. Filling thegrid in this
way, y o ucan use the full rang eof av a ila b ledigitizing
lev e ls.

OFFSET

toreduc ethevertical ga in

UTILITIES

TTIIPP:

:Press

to sele ct Special
Modes. T hen select the Channels menu
to ch oose

In: to set the offset of again
(VOLT S/ DI V) change in volts or vertical
divisio n s (this is in volts, bydefault).

Automatic Recalib ration: to turnthi s
featur eonoroff (default is “On”). “Off”
maysp eed capture, but timecalibrationis
no t certain durin g the capture per iod.

Global BWL: to control the global
bandwidth limit. When On, the chosen
bandw idth(see page 24 ) applies to all
channels. When Off, a bandwidth limit
canbe set ind i v i du al lyforeachchannel .

9. Use

ZOO M AND SCROLL AUT OMAT ICALLY

Use ZOOM to see more detail on you r signal. The display will show the original signal and its zoomed copy.

10. Press

11. Press

12. Press the button for:

The menus show n on the nex t page will be displayed.

A

A

to center the w ave form on the grid.

todisplaytheTRACE Amenus(todisplayTraceB,C,orD,pressitsbutton).

againor thetopbuttonto displaythetrace and its label. (Do thesameto turnoff a trace.)

:Togobacktothedefaultpower-up

TTIIPP:

settings, sim ul tan eo uslypr ess the secon d
and fif thme nu buttons fromthe top, an d

1

th e

CHAN NEL SELECT 1button.

20 ISSUED: January 2002 L TXXX-OM-E Rev B

C HAPTER O NE:

13. Use these menus to scroll back and forth through the full length of one or all of your zoom copies.
MULTI-ZOOM unifies th econtrol of all zoom traces, whileAUTO-SCROLL

w alks the zoom trace or traces across therefere nced trace.

Whe nOff, only the active zoom trace is controlled. When On,all
disp la yed zoom trac e s (A, B , C, D)are simultane o u slycontrolled
(automatically) with Auto Scroll and (manually) with thehorizontal
ZOOM and POSITION knobs. See the next page for more on
Multi-Zoom.

To scroll the zoom trace from right to left of screen. When playing,
the menu is labeled “ STOP (PL AYING)” : Press to stop.

To scroll the zoom tra cefrom left to right of scree n . When playin g,
the menu is labeled “ STOP (REVE RSIN G)”: Press to stop.

To scroll by divisions per se cond or number of divisions. Usediv/s to
scroll continuously for viewing. Use number of div forwaveform
processing ,espe ciallyPass/Fa il testing. Whe n processing is complete,
the displaywill be updated by the number of divisions set.

Catch a NewWave

To set scroll spe e d, using the knob . When scrollingby
divisions, 10 div will step the zoom trace “grid-pag e” by
“grid-page ” across the leng th of therefere nced trace.

To return to the TRACE A menus, w hile continuing to
scroll, by pressing the menu button.

RETURN

To stop scrolling and return to the previous menu displayed.

: Con siderzoomas anex tra time base that offer s

TTIIPP:

alternative sw ee pspeeds. You candisplayas many
as four zooms at once.

LTXXX-OM-E Rev B ISSUED:January2002 21

P ART O NE: GETTING STARTED

USE THE POSITION AN D ZOOM CON T ROLS

POSITION

: T he smaller Waverunner knobs

TTIIPP:

arer ate sensitive: the fasteryouro tate
th e m, th e greate rth ech ange th a t
results pe rincr em en t.

14. Tu rn

When using more than one grid, turn POSITION tomovetracesfromonegridtoanother.

ZOOM

15. Tu rn

POSITION

16. Tu rn

ZOOM

17. Tu rn

to placeTraceA verticallyonthegrid.

to adjust the expansion factor and increase the amount of zoom.

to movethezoomedregion of thetrace.

to verticallyexpand, or reduce, thezoom trace.

TOZ

OOM AN DMULTI-ZOOM

You can zoom several traces from a si ngle waveform to obtain precise timing
measurem ents and im prove the tim e resolution on your displayed waveform. F or
in stance , on a waveform com posed of two pulses separated by a long delay , you could
make Trace A a zoom of the first pulse, and Trace B a zoom of the second.

Multi-Zoom

traces, or t wo or more regions of the same t race, s imul taneousl y. W hen you acti vate mult i- zoom,
the horizontal zoom and position cont rols apply to all displayed traces — A, B, C, and D —
al lowing you to view similar sect ions of different t races at the same time. The vertical sensitivity
cont r ols still act individually on the t races.

When trace labels have dotted top and bottom edges, like the one at right, this
in d icates that their traces are mu lti-zoome d.

allow s you to move the zoom e d region of the waveform alon g two or more differen t

22 ISSUED: January 2002 L TXXX-OM-E Rev B

SET UP THE TIMEBASE

SETUP

TIMEBASE

18. Press

and acce ss th e TIMEBASE menus .

C HAPTER O NE:

Catch a NewWave

19. Use these menu s to set up the timebase in single-shot mode. SeeChapter 7,
“A Quest ion of T imebase,” for moreon the sampling modes.

Single -Shotsamp lingdisp lays da tacollecte ddurin gsuccessivesingl e -sh ot
acqu isitions from the inp ut cha nnels — capture nonrecurring, or very low
repetition-rateevents, simultane ouslyon all input cha nnels.

To select Internalor external — ECL, 0V, TTL — clock modes.
Selec t inte rna l unle ss using an externa l clock signal. See Chapter 7, “A
Quest ion of Timebase, ” for external clock . The LT364 series has
a “Channel Use” menu below “Sample Clock” (see “Pairing
Channe ls” in Chapter 8).

To sw itch sequence mode Onor Off.Usetheknobto
choose the number of segments. See Chapter 7, “A
Question of T imebase,” for sequencesampling.

To select the maximum number of samples to be
acquired, using the menu knob; and, to set the default
50k, usingthemenubut ton.

LTXXX-OM-E Rev B ISSUED:January2002 23

P ART O NE: GETTING STARTED

SET THE COUPLING

20. Press

1

and then the button for to display the couplingmen u s .

21. Use these menus to set input signal coupling and grounding, the channel
bandw idth limit, and the probe attenu ation.

Selects the signa l coup ling.

Move s your selection down the list. When at the bottom, as here, the
dow n arrow disappears and this button become s inactive.

Press NORMAL to set offset, volts/div, and inpu t coupling to display
ECL signals. Press again; settings for TTL signals are given. Press a
third time; settings will return to t hose of thelast manualsetup.

Press to turn thebandwidth limit Off or reduce the bandw idth to
200 MHz or 25 MHz. Reduces signal and system noise and prevents
high -frequency aliasin g. Global BWL mea n s that the limit set will
ap p lyto all chan n e ls. BWL me a ns tha t a limit can be set ind ivid u ally
for ea ch channel. See the TIP on page 20 for howto se t the se, using
SPECIAL MODES.

To set the probe attenuation factor for the input
cha n nel. Th ebutton s scroll up or down, whilethe
knobs scroll the selector up and down the list. LeCroy’ s

ProBus system automatically senses probes and sets
their attenuation. This menu then changes to indicate
thetypeof probeattached andits attenuation factor.
See the following pages for more on probes and
ProBus.

NNOOTTEE:

:

AC position: signals are coupled capacitively , the input signal’s DC component is blocked, an d
signal frequencies belo w1 0Hz arelim ited.

DC position: signal frequency components are allowed to pass through, and an input impedance
of either1 MΩΩΩΩ or 50 ΩΩΩΩ can be selected. The max im umdissipation into 50 ΩΩΩΩ is 0.5 W. Whenever

this is attained, inputs will automaticallybe gr o unded. “Grounded” wil l be h ighl ighted in the
“Couplin g” men u and anover lo ad message will be displ ay ed in the Acquisition Sum m ar yfield.

Reset byrem o v in g the sign al fromth e inp ut an d reselectin g “DC5 0ΩΩΩΩ.”

24 ISSUED: January 2002 L TXXX-OM-E Rev B

SETUP FOR CAL AND BNC SIGNALS

UTILITIES

1. Press

.

C HAPTER O NE:

Catch a NewWave

2. Press the button to select

and display the CAL BNC OUT menus.

3. Use these menus to choose the ty pe of signal put out at the front CAL and
rear BNC signal outputs. Set the freque ncy, amplitude, and pulse shape of
thecalibration signal.

To set the type of signal from the rear BNC connector.

To reset the CAL output to its default state: a 1 kHz 1 V square wave .
TheWaverunne r automa ticallysets the calib ration signa l to its defau lt
when switched on.

To select the form of the calibration signal.

To set the pulse level for the CAL output (rang e: −1.00 to

1.00 V), using th eknob.

To set the desired frequency of a CAL signal in the range
500 Hz to 1 M Hz, usingtheknob.

LTXXX-OM-E Rev B ISSUED:January2002 25

P ART O NE: GETTING STARTED

TOC

ALIBRATE THEPASSIV EPROBE

Your Waverunner scope comes wit h a L eCroy passive probe for each channel .

First.
Second.
Third.

Things”).

Fourth.

T he CA L sign al will be a 1 k H z squ are wave, 1 V p–p.

Fifth.

Sixth.

Seventh.

Eighth.

N inth.

T urn on your Waverunner scope.
Insert the probe lead in the Channel 1 input.
Connect t he probe tip t o the C A L output (see front panel ill ustrat ion in “ F irst

Attach the lead’s alligator clip to theground ring indicatedby ,locatedbelowCAL.

UTILITIES

Press

Press to select and set t he amplitude level.

Nowselect to set the frequency in the range 500 H z to 1 MH z.

S et channel coupling t o D C 1 MΩusing “ C oupling” (see previous page).

Press

1

, then the button to select

to turn on C hannel 1.

AUTO

SETUP

T enth.

I f overshoot or undershoot of the displayed signal occurs, adj ust t he probe by inserting the small
screwdriver, supplied with the probepack age, into the potentiometer on the probe head and turning it
clock wise or counterclockwise t o achieve the optimal square wave contour.

Press

twice.

26 ISSUED: January 2002 L TXXX-OM-E Rev B

C HAPTER O NE:

Catch a NewWave

HOWPROBUSH

L eC roy’s ProBus probe system provides a complet e measurement solution from probe

tip to oscil l oscope display.

ProBus allows you to control tran sparent gain and offset direc tly from your front panel —
part icularly useful for volt age, differential , and cur rent active probes. It uploads gain and offset
correction fact ors from the P roB us E PR OM S , and aut omat ical ly com pensat es to achi eve fully
calibrated m ea surem ents.

T his int elligent interconnect ion between your Waver unner scope and a wide range of accessories offers
important advantages over standard BN C and probe ring connections. P roBus ensures correct input
coupl ing by auto-s ens ing the probe t ype, eliminating t he guesswork and errors t hat occur when
attenuation or ampli fication factors are set manually.

ELPSYOU

: U se Waverunner’s rear panel BN C signal output to provide a

TTIIPP:

pulse:

Fo rPass/ Fail testing
At th eoccurren ceof eachaccep te dtr i ggerevent (Tr iggerOut)
Whenth e scope is ready to accept a tr igger event (Trigger Rdy)

LTXXX-OM-E Rev B ISSUED:January2002 27