FLUKE AND PHILIPS - THE GLOBAL ALLIANCE IN TEST & MEASUREMENT OSCILLOSCOPE BASICS At Your Fingertips. .. Using the Philips Smart ‘Scope family PHILIPSOSCILLOSCOPE BASICS AT YOUR FINGERTIPS... USING THE PHILIPS SMART ‘SCOPE FAMILY CONTENTS Pictorial Measurements Meet the Smart ‘Scope Family Logical Layout... as simple as ZYX Quick-Operating Chart Softkeys for Simplicity Green for Go (AUTO SET} Looking on the Bright Side (Z-Axis) Signal input Circuits (Y-Axis) Input Coupling Amplitude Adjustment Vertical Positioning and Inverting Combined Operations A+ B,A — Band Trigger View The Time Scale (X-Axis) Magnifying the Time Scale Getting a Stable Display MTB Trigger Modes Trigger Sources Tiigger Coupling Trigger Level and Slope Tiigger Hold-off Choosing Time-bases Looking for Signal Detail Time Measurements with the DTB Delayed Time-Base Triggering Trigger Delay for Jitter free Display X Displays (X DEFL) Extra Timing with Z-modulation Extra Measuring Features Voltage Cursors Time Cursors Risetime Function Zoom Funetion User Text RERESBRBNBRRBLMEET THE SMART ‘SCOPE FAMILY ‘The Philips Smart ‘Scope famiy is a complete, versatile, 60 MHz and 100 MHz oscilloscope system with a choice of standard transportable and rack-mounted units. All this plus an extensive range of system-oriented extras to provide exactly the configurations you need, Options that willaddextra functions, measuring convenienceand greatermobilty to your daily oscilloscope programmes. Brief details ofthe Philips Smart ‘Scope family areincluded here for completeness together with alist of ascessories. For further details please contact your local Fiuke-Philips organisation, Instruments: 60 MHz oscilloscope with single time-base 60 MHz oscilloscope with dual time-base 100 MHz oscilloscope with dual time-base 100 MHz oscilloscope, dual-time base with cursors Options (Factory installed) Rackmount P? Phosphor CRT Y Output ‘Sweep and Gate output Accessories: IEEE-488 Interface for systems with IEEE controllers All oscilloscope functions except potentiometer settings can be remotely controlled. Front-panel memory back-up for storing one front-panel setting even if mains poweris disconnected Oscilloscope adjustable stand Front cover Oscilloscope camera Video line selector ‘Accessory pouch Battery pack Oscilloscope trolley Probes 100 MHz, 10:1, 1.5m, modular with scale read-out 75MHz, 10:1, 2.5m, modular with scale read-out 300MHz, 100:1, 1.5m, modular 15MHz, 1:1, 1.5m, modular 15MHz, _1:1,2.5m, modular 650 MHz, FET probe ‘AC current probe Isolation ampifier.LOGICAL LAYOUT... AS SIMPLE AS ZYX The Smart Scope famity of oscilloscopes chosen for this instruction manual have an ergonomically designed front panel layout that makes operating as easy as reading a book - a mainly lett-to-ight, top-to-bottom logical sequence of fingertip operations. Even the front panel ZYX clvision into the three basic classification is simpler than it sounds. After switch-on, no need to hunt for the trace - the press of an AUTOSET button (Green for GO) gives automatic Settings of all scope parameters for the connected input signal. ‘And optimum trace and spot quality is easily set by the left-hand Z controls INTENS and FOCUS. Eyes right then for the vertical (Y) display parameter controls: Up/Down rockers for vertical amplitude, function pushbuttons and Y position variable controls. Finally, eyes down for the X-axis controls: MTB, DTB rockers, X position variable controls, function pushbuttons and triggering controls.QUICK-OPERATING CHART AFTER POWER ON PRESS AUTO SET TO SELECT TIME, AMPLITUDEAND. TRIGGER OF YOUR INPUT SIGNALIS) ‘VARIABLE CONTROL OF CHANNEL AMPLITUDE OR ‘MAIN TIME Base FLASHING" > "IN UNCAL [e) at. f KoRonral Posi 6 CONTR ‘ABIABLE CONTROL TO SET THE LEVEL OFTHE TRIGGER POINT AT WHI THENTB STARTS {VARIABLE CONTADL OF “TE MOUD OFF TIME BETWEEN MTB SEEPS ‘VARIABLE CONTROL TO SETTHE LEVEL OF THE TRIGGER PONT AT WHO THEDTE STARTS iL auTPIT Socket eaov NGA 2 Wop ice BATINPITSOOKETUR VIABLE COTaDL TO speak Sia Wave Exehaliacaeancos | [exc npursoocerrom | | SErTHEOT Senay fe cauaeaiow on TCD PANEL: DIETS SHLETED HOROWAL OER VomLoMinas | | PosToNWeN ose PROBE RDWUSTWENT FUNCTIONS STINGS APABAWETEAS | | TON wing ecocwcea | | NGA aNO a 8SOFTKEYS FOR SIMPLICITY ‘Anin-depth view of the options behind the multi-function keys. auto uP -DowN Ser a CONTROLS LJ L_ Al SELECTION OF Ch.A hy DEFLECTION COEFFICIENT we die As HOF 100 se ono DEFLECTION COEFFICIENT [—) LW Joon 78 Terme selics Boas i fi em SELECTION OF MAIN TIME wwr9fia) SEE : . SELECTION OF DELAYED TIME BASE DEFLECTION COEFFICIENT Ie, Ie IK 4 je IP Ear ext acioc we DELAYTIME conTRot # To look down the menu! Press MENU for learning mode. = Press any softkey for an automatic indepth view ofits step functions.GREEN FOR GO! Unlike conventional oscilloscopes, getting started after switching on a Philips SMART SCOPE is easy: - first connect your signal under test, any signal; ~ check the INTENS and Y POS controls are at “12o'clock”; ~ press the green AUTOSET button. Settings for amplitude, time-base ard triggering are then ‘brought into range. For convenience, only the selected functions, channel, ampiitude, time-base and triggering are displayed on the LCD panel -no more, no less! Forexample, connectthe CAL signaltochannel A input; = Press AUTOSET 0 The display shown will be obtained automatically ‘The LCD willindicate: f ric | Yamphsetting 05Vidiv Uae AC-coupled, , ~ channel A selected ~ Tiggered ~ Main Time-base selected me ne-base 5 ~ Automatic triggering ie |= MTB speed 0:Ims/div ain ue ~ Trigger source:channel A triggers on +ve slope, ~ pk-pk trigger coupling ‘The display shows that the CAL signalisa square-wave of 2kHz, amplitude 12V.LOOKING ON THE BRIGHT SIDE (Z-AXIS) COnthe left we have the controls that influence the display of the electron beam on the CRT. After intial ajusment they rarely need to be touched, INTENS: controls the brightness of the displays TRACEROTATION: aligns the base-line of the signal with the horizontalgraticulelines, Thismay vary with different locations due to the earth's magnetic field. FOCUS: sets the sharpness of the trace ILLUM: conttols the illumination of the graticule. The Z-MOD socket on the rear of the oscilloscope provides a useful input point to control the trace brightness with an external signal (see Extra Timing with Z-modulation, page 22). "SIGNAL INPUT CIRCUITS (Y-AXIS) tae A Vert ica biseuar ja ‘As when plotting a graph, the part of interest must be FE shown andasuitable scale chosen for the Y signal value, ‘The Y-detlection system is built-up in logical stages, each performing a specific function. Theinput signalis suitably coupled totheinputattenuator which serves to calibrate it and bring its amplitude to a ‘convenient viewing level. ‘The vertical channel selector chooses which channels shall be routed to the final amplifier and the Y deflection plates of the CRT: A, B, ~B, A+B, A~B, TRIG VIEW or a combination of these. Note that the trigger pick-offs are before the INVERT and Y POS controls so that triggering is not influenced by ‘them. Similarly, Y POS is independent of the INVERT button 2INPUT COUPLING The function softkey AC/DC offersthe choice of input, coupling via a capacitor (AC) or direct (DC): = AC-coupling blocks the DC component of a signal and is useful when an AC signal superimposed on a DClevelneeds to be observed; e.g. spikesona5VTTL is automatically selected Remember, however that low frequencies are also attenuated by AC-coupling. = DC-coupling allows both the DC and AC compo- o«8| nents of the signal to pass without attenuation. Therefore DC-coupling gives undistorted waveforms -343 for the lower repetition rates. AC/DC GND 2 el The softkey GND interrupts the connected signal and grounds the Y channel input to display the base lin, This zeto-ine may then be set by the Y-POS control as a reference point for further displays. DE COUPLING Tove FULL BANDWIDTH 13AMPLITUDE ADJUSTMENT P= al The conventional AMPL,/DIV rotary switch has been superseded by fat, fingertip-action rocker control. Simply press left (V) for UP, right (mV) for DOWN. ‘The scaleis from 2mViciv to 10 V per division ina 1-2-Sstep series, with the selected range instantly displayed in the LCD. vm var ov sv loom oO ‘The VAR control gives a variable, fine adjustment be- tween the 1-25 steps but must be set tots clockwise 2 || Dn CAL position for calibrated measurements. A »v | = flashing ">" before the range value indicates that the VAR controt is not in CAL position; i.e. it warns that the os v |) iit ‘scale displayed is greater than (>) the range value o2v oom indicated. ot v || fit For example, in CAL position, when 0.2 Vis displayed in som | GliEan the LCD, each division height represents @ signal ‘amplitude of 0.2.V {200 mi/). So a pulse height of 600 mV aw || ii ‘occupies 3 divisions. om Note that with the VAR control turned anti-clockwise out roo | OO of CAL, the seme signal would occupy something less sev || Gi than 3 divisions, aw. 1 “VERTICAL POSITIONING AND INVERTING For easier viewing, or for comparison purposes, signals may be shifted up or down on the screen by using the Y POS contral(s) on the upper right of the front panel. (Or even upside down (channel B only) by selecting the INVERT function of the ADD/INVERT softkey. Note that inverting the signal does not influence the setting ofthe position. INVERTED DISPAY) (CH.B ONLY) DISPLAYED. DISPLAYEDCOMBINED OPERATIONS In the dual channel versions, both channels operate identically, The A/B softkey selects channel A, AandB orB. The ALT/CHOP softkey selects the ALTemate or ‘CHOPped mode for tracing two or more signals. In the ALT mode, the CRT beam alternately traces one signal ‘sweep and then the other. At low repetition rates this, writing action canbeseen, so ALTis mainly used for high- speed signals (about 0 ms/div and above). Inthe CHOP mode, the beam chops from onesignal tothe other at 2 fast switching frequency and is therefore ‘suitable for low-speed signals and the only possible mode for single-shot events. 16A+B, A—B AND TRIGGER VIEW Signals added or subtracted ‘The ADD/INVERT softkey function enables algebraic combinations of the A and B signals to be displayed as a third signal. Its position is influenced by both the A andB “eo position controls (Y POS). = AandB ADD inthe LCD panel displays A, Band A+B. AandB ADD INVin the LCD panel displays A, B WERT andA-B. This differential mode (A‘B) is useful for rejecting we common-mode signals. By measuring in differential 400) mode, the common-mode signal presenton one channel. [#°2, ; cancels out the common-mode signal on the other | channel leaving the real signal visible on the display. [Es" Atypical application of this is the elimination of hum. Displaying the trigger signal The TRIG VIEW softkey enables display of the actual signal used for triggering the instrument (see Trigger Modes, page 20). It shows the triggering conditions for ‘the time-base. ‘TRIG VIEW mayalso beused asa thirdchannelinaddition to channels A and B. In this event, input is via the EXT socket and the TRIG or X SOURCE softkey function, must be selectedTHE TIME SCALE (X-AXIS) The horizontal time axis deflection coefficients of the display are setby 2 rocker contol. For the moment we will consider the main time base (MTB). The scale is from 50 nsidivto0.5s/divina 1-2-5step series. Simply pressleft(s) for a slower time-base and press right (ys) for a faster time-base. The VAR control gives a variable, fine adjustment between steps but must be set to its clockwise CAL position for calibrated measurements. Aflashing’" >" before the range value warns that the VAR ccontiolis not in CAL position. 8 UUUEERNOOEEOOUUNEOUEEE: Example: Connect the CAL signal to A and select AUTO SET to prove the method of calculating the period and frequency of a signal Ensute that the VAR controls fully clockwise at the CAL position, ‘The MTB scale setting in the LCD shows 01 ms and one ‘complete square-wave occupies 5 divisions: 5div x01 msidiv = 0.5ms From this period the frequency of the square-wave is, calculated 1/0.5ms = 1000/05 = 2kHz. ‘This method can be applied todetermine the frequency of any waveform.MAGNIFYING THE TIME SCALE Pressing the TB MAGN softkey magnifies the X time- basebyatactor of 10, ndicatedbya"*”infrontof thenew deflection factor shown in the LCD. For example, a0.2ms deflection reads *20 ys after pressing TB MAGN. ‘As shown, the signal is stretched out in the horizontal direction. The advantage of using TB MAGN over setting the time-scale toa faster setting with the rocker switch is that the viewing window’ can now be moved along the original signal now expanded in time} using the X-POS, control. Everypartof the original signal can, therefore, be seen in much greater detail. 9GETTING A STABLE DISPLAY INPUT SIGNAL TRIGGER PULSES SWEEP (EACH PULSE TRIGGERS A NEW SWEEP) SWEEP (TRIGGER PULSES ARE DISABLED DURING SWEEP TIME) About triggering For repetitive signals, a stable, jtter-ree display will only beobtainedif each horizontalleft-to-rightsweepisstarted (triggered) at precisely the same point on the signal waveform. A trigger pulse, usually a sample of the input signal, is used to start the time-base when the pulse crosses a certain pre-determined level, either on the signal's positive or negative slope. Attheendof each sweep, thetraceisblankedand the spot is quickly brought back (the fiyback). It will start the sweep again on receipt of a trigger pulse at exactly the same pointas before. Itisimportant that any trigger pulses that occur during the sweep oF flyback should have no effect. This situation is possible if several waveforms are displayed on the screen (see Hold-off, page 25) 20 eae L$ Steps to successful triggering 1. Select the trigger source: Either of the two input channels A or B, an external signal or a signal derived from the mains (see Trigger Source, page 22) 2. Select trigger coupling: Decide if the whole signal has to be passed (DC) or fit has tobe fitered;i.e. pk-pk, TV Lineor TV Frame pulses (see page 23) 3, Select trigger level and slope on the input signal at which the sweep shoul start (see Trigger Level and Slope, page 24):MAIN TIME-BASE TRIGGER MODES With AUTO SET selected, the MTB is free-running (AUTO) in the absence of trigger signals, ‘The TB TRIG MODE softkey can be used to select: ~ AUTO mode: free-running. The connected signal is always displayed, — TRIG mode: the MTB will only start on a suitable signal derived froma selected trigger source (A, B, EXT or LINE). Neither the MTB nor the OTB will run without trigger pulses. So when not triggered, the signat is not displayed. — SINGLE mode: the MTB runs only once after the receipt ofa trigger pulse. The required trigger level can be set up beforehand in the TRIG VIEW mode, ARMED is displayed until receipt of a trigger. Press RESET softkey to re-arm (ARMED) circuit to await the next trigger pulse. [aroha] Capturing single events (SINGLE-SHOT) First set-up as for repetitive waveforms, re 1816 | uses aTRIGGER SOURCES ‘The TRIG or X SOURCE softkey selects the MTB trigger signal (or X source for X DEFL) from one of five sources: 1 Tigger source channel A. Two frequency related signals can be checked by triggering on the lower frequency signal of the two. @ rae on « SOURCE, 2. Composite triggering of channels A and channel B if as theyarenottime- or frequency-related. With each ALT a siveep the trigger signals also switched to the other B [racccer source| channel (composite not active for X DEFL orin CHOP (wor CHOP troask On EFL) ext 3. TTigger source channel B. ex | TRIGGER — 4, An external trigger source (EXT AC/DC softkey CHANNEL @ selects the coupling mode). This offers the possibilty exremAL tobe used asa third channel. une | TRIGGER 5. ALINE trigger source derived from the internal mains ac oR 00) oc supply. This is used for instance to detect whetherline | une (wains) frequency interforence is present in the signal that is TRIGGER being meesuted, Source 2TRIGGER COUPLING The TRIG COUPL softkey offers choice of trigger coupling: P-P_ (peak-to-peak) triggering gives automatic ranging of ‘the LEVEL control, the range being determined by the peak-to-peak value of the signal DC isthenormaltrigger coupling. Allthesignalincluding any DC component is passed, TVFallows triggering at the slow TV Frame (Field) synchronising pulses; the LEVEL control is i operative. ‘TVLaliows triggering at the fast TV Line synchronising pulses; the LEVEL control is inoperative. In addition, some oscilloscopes also have low frequency (LF) and high frequency (HF) reject filters. Note that ther softkey selects: "+" (pos. video) or —" (neg. video) if TVF, TVL or X. DEFL are selected. More about TV Triggering The relationship between TV Fields and TV Lines is shown. In either the TVF or TVL trigger modes the sync. pulses of the video signal are separated from the picture content and are used to derive the Field and Line trigger pulses, ATV Field and Lines are displayed on the oscilloscope picture ie, they are written over each other. A single line may be selected for display by using the delayed time- base facility (see page 27). The two Field sync. pulses are necessary per frame because the lines are interlaced on television to give a mote stable pictur. NORMAL FULL te | BANOWIOTH TRIGGER COUPLING TRIGGERING ON TV FIELO PULSES WL TRIGGERING ON TW LINE PULSES: fe b couPLere Feame ___|TRIGGER LEVEL AND SLOPE / 28 18 (roooe., }ermij Therotary LEVEL MTB controlallows the tarting point cofthemain time-base display to be continuously adjusted ‘over the signal waveform as shown, The." softkey (SLOPE) can be used to choose either the positive-going slope (or the negative-going slope (7 for triggering. This softkey inverts X DEFL signals;itgivesa”+" or'"—" indication of video polarity when TVF, TVLorX DEFLare ‘+ S*+€C70) selected, 24TRIGGER HOLD-OFF ‘The HOLD OFF controlis used to prevent trigger signals from interfering with the start of the sweep; ie. it prevents ‘riggers before the time-base sweep is complete, so eliminating the problem of “doublewriting” when displaying multiple pulse signals. If double-writing occurs, the HOLD OFF controlis adjusted from MIN until the overlap on the base-line disappears, Example: The double pulse input signal means that the selected trigger signal sees the same conditions on the second pulse as the frst and so starts the time-base too soon. The double-writing effect is seen as an extended base-line on the upper trace. ‘Adjusting the hold-off time will inhibit the trigger until it sees the first pulse again and over-writes it exactly, as in the lower trace.CHOOSING TIME-BASES So far we have concerned ourselves with the main time- base (MTB). ‘The TB SELECT softkey gives choice of four different horizontal display modes: MTB ~ deflection by the main time-base. TBI ~ deflection by the intensified main time-base. This provides a method of locating any part of the signal that needs to be displayed by the delayed time-base, ‘The DTM rocker (Delay Time Multiplier) controls the delay time. MTBIDTB — - two traces: deflection by MTBI {intensified main time-base) and by DTB, the delayed intensified portion of the time-base. TRACE SEP controls vertical shift of OTB trace. ore ~ deflection by the delayed time-base {the selected intensified part of the MTB). oe 18 deere AND O78 [is two Teace’ joer Sy ore ‘SHOWING pat oy }LOOKING FOR SIGNAL DETAIL Searching for aparticular partofa magnified signalcanbe difficult. The Main Time-Base Intensified (MTBI) facility offers a means of marking the area of interest on the main signal. The selected deflection coefficient of the Delayed Time-Base (OTB) will determine the length of the intensified part. Its position is set by the DTM (Delay Time Multiplier), which delays the start of the DTB to the selected value (shown in the LCD panel). The delayed time-base then ‘automatically displays in detail the selected intensified part of the main time-base. Example: Select AUTO SET andpress the TB SELECT softkey to display TBI ~ Set the length of the intensified part with the OTB rocker switch. ~ Press DTM rocker switch to shift the intensified part to ‘the signal area of interest. ~ Ptess TB SELECT to display both time-bases (MTBI OTB). Use TRACE SEP rotary control to separate the traces, = If necessary, use DTB rocker switch to adjust range. Press TB SELECT to display DTB only, 1B SELECT OTB aTIME MEASUREMENTS WITH THE DTB ‘As the DTB can be started anywhere along the MTB waveform (DT controlis electricaly-coupled to the MTB. up-down control), it provides a precise means of measuring time intervals. The DTM (Delay Time-base Multiplier) rocker controlis used tostep change the delay. The starting points determined by comparing the MTB sweep voltage with an accurately controlled DC voltage, set-up by the DTM rocker control. At the point in the sweep where this adjusted DTM voltage is equal to the MTB value, the DTB starts as shown. The delay time can be read from the LCD display, which is time-related when the MTB is calibrated and when STARTS is selected as DTB trigger source. The LCD is division-related when the MTBisnotcalibrated or when DTBisin triggered position. As stated, delay time can be read directly from the LCD. Tomeasure anintervaloftimeT, saya periodofa displayed waveform, read off the start of the period, DTM, then set, the intensified starting point with the DTM rocker to the the end of the period and read off DTM2. The required T ‘measurementis then given by DTM2-DTMI1. Example below: 170.00 - 100.00 = 70ms.DELAYED TIME-BASE TRIGGERING ‘The DTB triggering isindependent of the MTB triggering, but offers similar facilities: Channel A, composite, channel B, EXT, TVL. ‘Theres alsoa "STARTS" trigger facilty. This means that in the MTBI or DTB mode the delayed time-base generator startsimmediately ater the delay time selected composure ‘on the DTM rocker control, SmloGeR DTB triggering avoids (time) instability of the display SOURCE (jtter), which may be present when short DTB times are CHANNEL @ used in relation with the MTB time/div to get high ExT ‘sce magnification. 4 exrennar Tw | ‘ticcer Note that the EXT AC or EXT DC are selected by the EXT oe AC/DC softkey. starts | Thigoer SOURCE TIMEBASE Stans aereR oetay Me ext croc 29TRIGGER DELAY FOR JITTER-FREE DISPLAY ‘Some instability may be present in such input signals as long pulse trains, where the time between successive pulses is not constant. This could result in jitter when examing say a single pulse if the DT8 is triggered by the MTB, because the trigger point is fixed; ie. the DTB starts whether or not the starting point of the pulse under observation is present However, ifthe DTB is triggered independently from the input signal and not from the MTB, a stable display is obtained. Here the actual trigger delay consists of the adjusted delay time plusthe time taken for thenext trigger pulse to appear; i. the DTB waits fr the signal DISPLAY TRIGGER PULSE ACTUAL DELAY TIMEX-Y DISPLAYS (X DEFL) ‘So far we have displayed signals asa function of time (the familiar Y-t graph). However, the X DEFL softkey allows one signal to be displayed as a function of another. ‘The required X-axis signal is selected by the TRIG or X SOURCE softkey (A, B, EXT or LINE). Channels A and B offer a wide range of sensitivities, whereas the EXT socket input has a fixed amplitude. The XY mode has a wide range of applications, for example: ~ amplitude vs. frequency of circuits and filters; + output current vs. input voltage of semiconductors; ‘omparison of frequency or phase shift using Lissajous figures. TRIG OR X SOURCEEXTRA TIMING WITH Z-MODULATION ZMOD MTBqateorsweep REMOTE CONTROL OT Tr Minilll 2s O You DTB gate LINEIN FUSE HOLOER After the forward sweep, the display is blanked during the flyback time so that there are no unwanted traces on the soreen as the beam returns to the start position - for the ssame reason you take your pen off the writing paper between lines! However, this beam on/off facility can also be usefully f employed during the forward sweep to display markerson the trace, for example clock signal, or a signal to ‘suppress non-relevant sections ofthe trace. / \ / Thisis doneby applying therequired blanking signalto the | \/ \/ ZMOD BNC-input on the rear panel. The input is TTL- compatible, Blanking occurswhen the signalexceeds2V. *— Hi UL ik (woo)EXTRA MEASURING FEATURES Timeand amplitude measurements can be simplified by using cursors to mark-off the selected points on the displayed traces. Inthe Smart Scope Family afour-cursor control facil- ty is featured in the PM 3070, permitting accurate, X ‘and Y ertor-free analyses to be made on-screen. Five softkeys at the lower edge of the display area offer cursor, beam and user text control. evans \ wer cues ye aw aT wrens, sev) sore cons user A135! SON ano lowe oonoo | ooo 1 oe ae) { 7 at Sess Sn t cit = Fone net onom.VOLTAGE CURSORS ‘The CURS MODE softkey gives a choice of VOLT or TIME cursors. The default position gives VOLT cursors. This is indicated and setin the submenu by ‘VOLT ‘intensified. Thereadout canbe chosen tobein volts or asa % ratio by selection of V/ RATIO softkey. The.A/B softkey determines the channel selected for the cursors. With the functions set, press RET toreturn to the top menu level. ‘The CURS CONT soitkey controls and activates the special functions of the chosen cursor mode. ‘The Volt Cursor submenu. ror tevet curs, curs sea reat Text woe> conr> CONT> CONT> OFF SF any aey RETURNS Votr setectea Felner cos vi are net Noir! cont» ratio i oa pa +a 9% V- cursor mode An example of a voltage measurement. “4 {eee SET RISE TRACK MORE RET s00% ON =~ MORE _ReT Ba we c4tc4g an Caco co Up Down Cres add return rawes Ses functions: Chor extra cursor cursors flash at track menu value at 10% borders 100% and S0% and sets Tecursors 34TIME CURSORS ‘The CURS MODE softkey gives a choice of VOLT or TIME cursors. Depress the softkey to indicate and set ‘TIME’ intensified. The readout can be chosen to be in time, phase or as a % ratio by selection of the T/PH/ RATIO softkey. ‘The CURS CONT softkey controls and activates the special functions of the chosen cursor mode; the Time Cursor submenu. rop tever urs curs seam text text | 33 Gbe> Cont EGA Cen> Ge moc ANY KEY TIME selected RETURNS, cURS| TPR) RET GONT> RATIO. TIME. lvour = Eo aS ose (ore saas C1588 919 1 -cursor mode (RISE ON) “Amexample of atime (“frequency”) measurement. Le aera | _ RISE 00M === Faack wore _ner Off OMOFE MoRe RET co SSee an flash at borders track — menu T-cursor mode (RISE OFF) REF SET SET. 200m <== Rack More _ReT 300% 360° ON/OFF_MORE _RET C27 C7C4UCIC4 c4cacacica left, Right Get, add return makes curses fonctions: Chor extra cursor Set to flash at borders track — menu value 360° 100%,RISETIME FUNCTION (dV/dT) ‘The CURS CONT softkey controls and activates the special functions of the chosen cursor mode. After selecting \V-cursors (CURS MODE} and having adjusted the cursors to the peak-peak values of your trace, to measure RISETIME, press submenu softkey MORE and select RISE ON. When activated, this function: ~ sets the Y-cursors at 10% and 90% of the ald Y-cursor values. ~ sets the T-cursor togive contralby twoextra cursors, which mustbe placedat theintersection of the race and Y cursors. ~ gives the dV, dT values in the readout. ~ Risetime is dT at 10% and 90% of dVp-p URS CONT> MORE(Submena) ed Arise time measurement. 36ZOOM FUNCTION The CURS CONT softkey controls nd activates the special functionsof the chosen cursor mode. The ZOOM function is Useful for taking a closer look at cata in the Time-cursor mode. Selecting this softkey results in the following: ~ the DTB is selected - the DTM (delay time multiplier) controls sotto the position of the first reference) cursor. - the DTB speeds set to the fastest position so that the two cursors fallin the intensified part of the MTB sweep. The cursors can then be set manually to zoom into the particular detail required. curs cuRS z00™ MOOE> TIME RET CONT > MORE ON/OFF co —USER TEXT ‘The user text facility enables details to be added to a display for identification purposes or to include extra information. Itis very useful when the oscilloscope forms part of a system; eg, vis the [EEE-bus, It enables the user to take screen photo's with on-screen comments, curs curs BEAM TENT Text MODE GIN%> _CONT> CONT> OFF CoO ee any KEV t ‘ CURS USER ONISFE TEX) RET Cogeco ANY KEY RETURNS 1 fe user text max 32 chars EoIT> ois CLEAR “= RET co cjco displays text on Bottom tine 1 user text_ max 32 chat sage cey RUB RET C3 ms [ay position Rays fer alpnarum selection by rockers AB NTE, RETURNS Text uses CONT Text Eom z—_a—ab—_ ABCDEFOMLKLM 78 MEM ssnaasrovniy2 sbedetghikln Jen 4 19 978 MI oscestovwnys ai copy“ hue RET jotesusenesioe SS a a oo A 9 - io