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HP 54502A User's Manual

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Contents

1. Waveform Math Menu 9 Introduction to The WAVEFORM MATH menu defines one of two math functions The the Functions functions are used on data that is displayed on screen from any of the four channels or from any of the four waveform memories If data froma channel is used for a function the channel must be turned on However if data from a waveform memory is used for a function that memory does not have to be displayed A function is generated by mathematically manipulating one or two operands with known operations The HP 54502A uses the following mathematical operations e plus minus e times x e versus e only o invert WAVEFORM i MATH Tisf2 off on f OPERAND ea Chan 1 2 wees oniy invert mern tea i OPERAND Chan t 2 mem te pL erni sensitivity Figure 9 1 Waveform Math Menu HP 54502A Waveform Math Menu Front panel Reference 9 1 The vertical display and offset can be adjusted to place the function for best viewing When the function has been calculated it can be used in the following manners displayed evaluated with the measurement features stored in memory outputted over the HP IB ee nn Defining a Function WAYEFORM MATH a E T a cp dsspiey gt off Eee assassin N OT A chonig 2 mem t 2 34 A E TT only invert E chon Eo mem 1 2 3 4 esnveensacomnasanemanemnsanannnssassenssaeesnsatjesanste
2. upperdlower mid threshoid upper threshoia t250 kv i jdwet threshoid i i 250 kV i j to 3 edge a a i upper iN of upper mid fromm threshold i tower Ln nanenntinninncam 25A 125 7 H i from edge ie at upper mid lower continuous ativan i i iower i Semen thr esha td i i TASA 125 Figure 11 1 Define Measure Menu HP 54502A Define Measure Menu Front Panel Reference 11 1 The first menu sets the dynamic controls for measurements The second menu sets user defined parameters for the measurements The third menu sets up the measurement comparison test n Measurement Each key in the numeric keypad section has a secondary function Above Selection each key is a measurement selection printed in blue To make an immediate measurement of the displayed waveform perform the following keystrokes e Press the blue Shift key on the numeric keypad to access the secondary keys e Press the key that corresponds to the measurement about to be made e Rotate the knob to select the measurement source channel number c memory number m or function number f The choice made is displayed below the waveform display area e Press the appropriate number to select the source channels 1 2 memories 1 4 or functions 1 2 To make a selected measurement on a waveform source it must be turned on Upon selection of the measurement t
3. 10 0 us div ry 54501 WF83 time 40 000 ns fine Figure 6 18 Trigger on Field 1 Line 10 The trigger is now on the first horizontal syne pulse in the vertical interval with color burst information e Change the trigger point to field 1 line 21 Ty_TRIGGER edge pattern state dei oy hp running Source 1 level 237 500mv i polarity Lf erence et Gi 50 0000 us 0 00000 s 50 0000 us l 10 0 us div hoidof f 54501082 time fine Figure 6 19 Trigger on Field 1 Line 21 HP 54502A Trigger Menu Front Panel Reference 6 31 The trigger point is now on the last sync pulse of the vertical interval The next line contains color information in this case color bars are present e Change the trigger to field 2 line 1 TV_TRIGGER Ap running edge pattern i state serai ae gt source j p wavamia MC a EVE 337 SOOmV El o i polarity TF amem E aem m m m m e ee amni haii re po field 1 Nwwrrnaces pew line 50G000 us 0 00000 5 50 0000 us a 10 0 us div Oe eee S ho f dof f 54501 7WF 8 time 40 000 ns N ranraman aaaea fine Figure 6 20 Trigger on Field 2 Line 1 The trigger point is on the second sync pulse of the vertical interval This is the correct trigger point because fields 1 and 2 are interlaced Trigger Menu HP 54502A 6 32 Front Panel Reference Display Menu T a a a SE LE E TE ATT TD
4. Measure Define The Measure Define submenu selects measurement standards assigned by Sub menu the user This gives the option of making measurements based on signal width or delay settings or threshold parameters standard user defined If standard is selected no other choices are available and the HP 54502A Key makes measurements based on IEEE standards If however user defined is selected two sets of test conditions are DEFINE MEAS available to define the measurements meas MeGSi standerd user defined 54501 WFr2t thresholds This key sets vertical test conditions voltage or percentage ratios measurements Key independent of the horizontal test conditions edge slope and count Both sets of test conditions must be set to define the measurement The thresholds submenu sets the vertical test conditions at DEFINE MEAS e percentage ratio from 25 to 125 meas ot e voltage levels from 250 kV to 250 kV standard Note i i threshoids i The upper and lower thresholds must be set to levels that will fall measurements on the displayed waveform If either threshold is not on the vort waveform the measurement results will be the message not found rupper ihresholds Neresraareisunssssnsinnssensssstsistnsstttite tt etree _ thresholds 10 00 At 54501 Wr e2 Threshold settings apply to all user defined front panel measurements Define Measure Menu HP 54502A 11 4 Front Pane
5. PLUG DESCRIPTION Straight BS1963a 30 Streight NZS5198 45 79 200 90 Stroignt sCEE Y31 30 Straight Shielded Straight NEMAS 15P oo Straight Medical UL 54a Straight NEMAgi 15P CEEZ2 V3 AIZO 1625 System Cobinel Vse 250V i i 280V i F OPT 908 mgogo 8120 2296 1959 24507 Straight DHEK IG ap Stroight SARSIDA go Straight Miti 9a Rew TINTYOR t 90 228 907 228 Gray Mint Groy Groy 877221 Mink Gray 797200 797260 79 200 Mint Grey Nini Geoy Coco Brown gor22e sos2ze 96 244 dude Groy Jede Gray Black Biock 30 76 96 244 Jade Groy H i H oe Stra ght sSEVIGTE i 79 260 Minl Groy Switzer fond 797200 Mint Gray 797209 797 200 Ming Gray Ninit Grey 79 260 79 260 Jode Gray 907230 907 230 Dork Gray err ey fds snare COUNTRY i lnitod Kingdom Gyprus Nigeria Zimbopwe i Singepare meaa a SS Ae 6c i Austroies H New 2eaiang j East ond Wast Europe Saugi Arabic Go Afs ite India Unpolar ited in mony nat rons United Stetes Concda Mexico Prifiipings Tolwon United States Tonaca T i H For interconnecting system components and peripherais Uniled States ond H Canade oniy ec Denm k l Republig of South Afri
6. the two selected operands are added together Addition is calculated on a point by point basis e minus the minus operation subtracts the second operand from the first e times x the times operation multiplies the value of the first operand by the value of the second operand Each data point is multiplied with a corresponding data point and the product is placed on the function display The displayed waveform is scaled to correspond to a different sized waveform e vs versus the versus function draws a volts versus volts display of the two selected operands Versus cannot be stored in a waveform memory because measurements cannot be made on the resultant waveform however it can be stored in pixel memory In source x versus source y the vertical range of source y determines the horizontal range of the vs function Waveform Math Menu 9 3 chan mem Key sensitivity Key offset Key e only The only function displays the first operand and scales it e invert The invert function inverts the data of the first operand This key selects the second operand or the waveform that is manipulated against the first operand The choices are any of the displayed channels or any of the memories This key is not available if the operator is only or invert The vertical sensitivity of the function is set with this key This setting is for ease of viewing and making measurements with the newly developed waveform The offset of
7. Press TIMEBASE and select repetitive Press TRIG and select trig d display Select delay trigger mode Qualify on edge and the rising edge of channel 1 as the source Select a delay time of 2 5 ys to gain a stable trigger Set trigger on to trigger on rising edge 1 of channel 1 e e o o o This trigger setup qualifies on the first rising edge of the burst delays through the remaining portion of the burst then triggers on the first edge of the next burst HP 54502A Front Panel Reference A TIMEBASE Ap running s AE a Oy re f _ AAM AAA AAAA reference ret t Ent r iaht mT window 5 tte fetter ted UE 2 50000 us 0 00000 s 2 50000 us 500 nas div reailime repetitive SA SOZWAO Figure 6 14 Ten Burst Pulse w Stable Trigger e Press TIMEBASE and set time division to 500 ns e Return to the trigger menu and set trigger on count to 5 This tells the oscilloscope to trigger on the Sth rising edge of the next burst see Figure 6 15 hp running DELAY TRIGGER Nat RNA edge pattern Noormees ed JUO EL YOM anne pattern i state Fl 2 EXT Ee a E3 i i r delay time mmm ETBOOOO us 6 00000 s 2 50000 us 560 ns div pe REV GQST ON ccc 34502W16 Spun of at on j Figure 6 15 Ten Burst Pulse Triggered on Pulse 5 HP 54502A Trigger Menu Front Panel Reference 6 25 e Change the trigger on count key to 9 see Figure 6 1
8. 54502442 Figure 7 4 Connect the Dots HP 54502A Display Menu Front Panel Reference 7 7 ee ee d isplay record This key is available only when the HP 54502A is in realtime acquisition Key mode In realtime acquisition mode 2001 points are acquired and processed with each acquisition Five hundred of these points are DISPLAY displayed on the normal 10 division display With extended display record selected the 2001 points of data is compressed and displayed The timebase is then multipled by 4 to reflect this change It is easy to search for glitches when the display is in this mode co of screens m 2 Use this mode in combination with window in Timebase menu fora WE macro and micro view of the acquired data The top screen is the oes are ae compressed 2001 data points display and the bottom screen is the 501 data i G J r x connect dots ponis aisplay Serena This key toggles the 501 and 2001 point displays while the HP 54502A is mlspicy records alenia running only Since all 2001 points are processed data is not lost except koa j when the display persistence is set to infinite 7 Feber Sa off on i aes This key is not present in repetitive acquisition mode 548020741 filter Key The filter key turns on a smoothing filter for the 6 bit A D converter for realtime acquisition sweep speeds greater than 200 ns division As opposed to connect the dot display mode the fil
9. sS lt lt lt lt 7C2372E272XHE erp e erXrr_ _e_s e ES PROBE CAL Two probe calibration procedures are available in the probe cal menu MENU attenuation e time null UTILITY i malleus a l PROBE CAL j i MENU i H BE err time i null E channel 1 2 i a Star 7Ons 7ans cai i Tasssnsnsansssssenssnessnssssnsssntsnssssans gusessssssennanessmasel continue _ m continue exii menu i z H U abort exit menu 4502801 Figure 12 5 Probe Cal Menu HP 54502A Utility Menu Front Panel Reference 12 7 attenuation submenu PROBE CAL MENU continue abort exit menu iaa 54502W04 channel Key start cal Key continue Key abort Key exit menu Key Utility Menu 12 8 The attenuation submenu calibrates channel gain at the probe tip Channel gain can be corrected through probe attenuation down to 0 9 attenuation e Below 0 9 the error message Attenuation less than I see manual for action is displayed The corrective action is to recalibrate the HP54502A If the probe is not connected to the DC CALIBRATOR OUTPUT on the rear panel or the probe attenuation exceeds approximately 250 the error message Attenuation too high or bad connection is displayed The corrective action 1s to check the connections and recalibrate If recalibration is unsuccessful refer to the HP 545024 Service manual e Ifthe probe attenuation calibration is
10. 6 8 Front Panel Reference pattern Key This is an unlabelled field The display depicts the 3 bit pattern The active field is displayed in full bright and is changed with the knob The function key changes the bit selection of three levels e H high e L low e X don t care The criteria for high is higher than the current trigger level and low is lower than the current trigger level The 3 bit pattern is representative of the two channel inputs and the external trigger For example if the pattern is LXH the voltage on channel 1 must be lower than the trigger level set for channel 1 channel 2 is don t care so the input level is disregarded and the external trigger input must be higher than the trigger level set for external trigger If these conditions are satisfied by the inputs then the oscilloscope generates a trigger event Note When any channel is not being used in the qualifier pattern it Should be set as don t care The trigger level is still compared to the no input channel and a high or low is determined The only true don t care is X If the pattern XXX is selected a trigger event does not occur because a trigger event is not defined when Key This key controls five sets of conditions that must be satisfied to generate a trigger event These conditions are as follows e when entered a trigger is generated on the first transition that makes a pattern true The pattern must be false and go true to generate
11. C reference se een ant 7 i ndow mmm eti Ns Seles E r timebase 50 9 us div rm position as 0 00000 sq srnnaresassnsarsssnnastisstnnasseenentstetesacitit tnanasonnssl oe Be oe Timebase 4 4 The window function turns on an expanded timebase and the oscilloscope is placed in a multiple screen mode The normal waveform in the original timebase setting is displayed in the top screen with markers vertical dotted lines that enclose a portion of the displayed waveform Only the enclosed portion between the markers is displayed in the bottom screen Note The displayed timebase information under the waveform display area is windowed timebase information When the window is on all measurement results and information are windowed information This feature is much the same as the delayed sweep on an analog oscilloscope however with the dual screen the portion of the normal waveform can be viewed simultaneously The timebase of the windowed waveform can be varied from equal to the normal timebase to 1 20 of the normal timebase This equates to 1 2 of a major division When the reference position is set to left only the right window marker moves when the window timebase is changed When reference is set to right only the left marker moves and when center is selected both markers move This maintains a specified time reference without changing any timebase settings and the ability to move the reference
12. addressed 12 2 addressed menu 12 2 after save Key 11 8 Air Flow Requirements 2 7 Algorithms A 1 Altitude 2 2 attenuation menu 12 7 auto triggered scroll 4 2 Automatic measurements 1 1 Automatic Top Base A 2 AUTOSCALE Key 3 5 axes 7 6 C cal select Key 12 10 Calibration Procedure 12 12 calibrator protection 2 3 HP 54502A Front Panel Reference chan mem Key 9 3 Channel 3 7 CHANNEL Key 5 1 12 8 12 11 Channel Menu 5 1 CLEAR DISPLAY Key 3 3 CLEAR key 3 9 clear memory Key 10 3 clicker Key 12 12 clock Key 6 15 CLR MEAS key 11 2 connect dots Key 7 7 connect the dots 3 5 Contents of Shipment 2 1 continue Key 12 8 12 11 continuous Key 11 3 coupling Key 5 3 D D delta t markers 8 3 Dfdelta V markersDV markers 8 2 data acquisition 3 3 default conditions 3 11 Define Measure 3 7 Define Measure Menu 11 1 delay Key 4 3 6 22 Delay Trigger Exercise 6 23 Delay Trigger Mode 6 20 delayed sweep 4 4 Display 3 7 display Key 9 2 10 2 10 3 Display Menu 7 1 index 1 Display Mode Key 7 3 duty cycle A 5 E ECL TTL presets 3 5 Edge Definition A 3 Edge Trigger Exercise 6 4 edge Trigger Mode 6 2 Entry 3 8 EOI Key 12 3 Exercise Waveform Save 10 4 Delay Trigger 6 23 Edge Trigger 6 4 Pattern Trigger 6 10 State Trigger 6 16 tv Trigger 6 29 Exercise Waveform Math 9 6 exit menu Key 12 3 12 6 12 8 12 11 External Equipment Connecting 2 8 F
13. 54501 WF83 Figure 9 3 Dual Screen w Function On Waveform Math Menu 9 5 Wn a Waveform Math Exercise Instrument Setup Oscilloscope Setup Waveform Math Menu 9 6 In this exercise the WAVEFORM MATH menu is used to subtract one waveform from another Set up an HP 8116A or a signal generator capable of a 1 MHz 1 volt squarewave as follows e MODE NORM e FRQ 1 MHz e DTY 50 e AMP 100V e OFS 0 00V e Pulse square wave Connect the signal to a BNC tee on channel 1 using a 1 meter coaxial cable Connect another 1 meter cable from the other side of the BNC tee and terminate in 50 2 to channel 2 The extra cable length between channels 1 and 2 provides a time delay between the signals on the oscilloscope The propagation of a 1 meter coaxial cable is approximately 6 to 7 ns This delay is used to demonstrate the math function The following procedure assists in setting up the HP 54502A for optimal viewing e Press AUTOSCALE e Press DISPLAY to set the best viewing conditions Set display mode to avg of avg to 8 of screens to 2 e Press WEORM MATH to define the function Select f7 and turn the display on Select chan 1 minus chan 2 and set the function sensitivity to 2 00 V div HP 54502A Front Panei Reference _ The function subtracts channel 2 from channel 1 The propagation between channels has allowed a 6 to 7 ns spike To better view the results e Press TIMEBASE and set the ho
14. 6 connect dots Key __ __ an Chapter 8 8 1 8 2 8 2 8 3 8 3 Delta t Delta V Menu Introduction to the Markers AV markers Vmarker 2 Vmarker 1 At markers start marker stop marker a Chapter 9 9 1 9 2 9 2 9 2 9 3 9 4 9 4 9 4 9 4 9 4 9 7 9 7 9 7 Waveform Math Menu Introduction to the Functions Defining a Function Function Key display Key chan mem Key Operator Key chan mem Key sensitivity Key offset Key Vertical Scaling Units Displaying Functions Waveform Math Exercise Instrument Setup Oscilloscope Setup i i sal Chapter 10 Waveform Save Menu 19 1 Introduction to the Memories 10 1 waveform pixel Key 10 2 waveform Menu 10 2 nonvolatile Key 10 2 display Key 10 2 source Key 10 2 store Key 10 3 pixel Menu 10 3 volatile Key 10 3 display Key 10 3 clear memory Key 10 3 add to memory Key 10 4 Waveform Save Exercise 10 4 Instrument Setup 10 4 Oscilloscope Setup a Chapter 11 Define Measure Menu 11 1 Introduction to Measurements 11 2 Measurement Selection 11 3 meas meas def meas limit Key 11 3 meas Sub menu 11 3 continuous Key 11 3 statistics Key 11 4 Measure Define Sub menu 11 4 standard user defined Key 11 4 thresholds measurements Key 11 7 Measure Limit Sub menu 11 7 test Key 11 8 set Key 11 8 fail if Key 11 8 orif Key 11 8 save to Key 11 8 after save Key ee ee Chapter 12 Utility Menu 12 1 Introduction to the Utilities 12 2 HP IB menu 12 2 t
15. Input Signal 4 5 Setting the Oscilloscope 4 5 Viewing the Window a Chapter 5 Channel Menu 5 1 Introduction to Channels 5 1 CHANNEL Key 5 2 Vertical Sensitivity Key 5 2 offset Key 5 3 coupling Key 5 3 more Key 5 4 probe Key 5 4 ECLKey 5 5 TTL Key nis Chapter 6 Trigger Menu 6 1 Introduction to the Triggers 6 1 Trigger Mode Interaction 6 2 Edge Trigger Mode 6 3 Trig d auto Key 6 3 source Key 6 3 level Key 6 3 slope Key 6 3 holdoff Key 6 4 Holdoff Exercise 6 4 Instrument Setup 6 4 Oscilloscope Setup 6 8 Pattern Trigger Mode 6 9 pattern Key 6 9 when Key 6 10 holdoff Key 6 10 Pattern Trigger Exercise 6 10 Instrument Setup 6 11 Oscilloscope Setup 6 15 State Trigger Mode 6 15 clock Key 6 15 when Key 6 16 present Key 6 16 holdoff Key 6 16 State Trigger Exercise 6 16 Instrument Setup 6 17 Oscilloscope Setup 6 20 Delay Trigger Mode 6 20 qualify on Key 6 20 edge Qualify Option 6 21 pattern Qualify Option 6 21 state Qualify Option 6 22 delay Key 6 22 trigger on Key 6 23 Delay Trigger Exercise 6 23 Instrument Setup 6 23 Oscilloscope Setup 6 27 TV Trigger Mode 6 27 source Key 6 28 level polarity Key 6 28 field Key 6 28 line Key 6 28 holdoff Key 6 29 TV Trigger Exercise 6 29 Instrument Setup 6 29 Oscilloscope Setup a ae Chapter 7 Display Menu 7 1 Introduction to the Display 7 2 Display Mode Key 7 2 norm 7 3 avg 7 3 env 7 4 of screens Key 7 5 off frame axes grid Key 7
16. TTL presets RECALL 0 is an undo of these actions Waveforms cannot be saved to RECALL 0 Front Panel Overview 3 5 SAVE Key SHOW Key 2 00 V div offset 50 00 mV 4 40 0 W div offset 000 V f2 1 1 4 00 vV giv offset 100 0 mV i 4 50 00 mv 54301 AWF t8 Front Panel Overview 3 6 e RECALL CLEAR executes an instrument reset and returns the HP 54502A to default power up settings The oscilloscope does not perform power up self tests see Instrument Reset The SAVE key immediately stores the oscilloscope setup configuration in volatile memory Press SAVE and then select a save register 1 2 3 or 4 An advisory is displayed above the waveform display area indicating the setup configuration has been saved The SHOW key accesses the following information Channel scaling Channel offset Channel coupling Probe attenuation Trigger source Trigger level Math function operation Math function scaling Math function offset Memories eoet 8 8 8 8 amp Pressing the SHOW key toggles between the currently selected menu and the SHOW screen This screen presents the most complete and detailed instrument setup information Select this screen before making a hardcopy and all SHOW screen information is included on the hardcopy HP 54502A Front Panel Reference a a aaa Menus The MENUS section consists of nine keys TIMEBASE CHANNEL TRIG DISPLAY At AV WFORM MATH WFORM SAVE DEFINE MEAS U
17. aT Product This Hewlett Packard product has a warranty against defects in material Warra nty and workmanship for a period of three years from date of shipment During warranty period Hewlett Packard Company will at its option either repair or replace products that prove to be defective For warranty service or repair this product must be returned to a service facility designated by Hewlett Packard However warranty service for products installed by Hewlett Packard and certain other products designated by Hewlett Packard will be performed at the Buyer s facility at no charge within the Hewlett Packard service travel area Outside Hewlett Packard service travel areas warranty service will be performed at the Buyer s facility only upon Hewlett Packard s prior agreement and the Buyer shall pay Hewlett Packard s round trip travel expenses For products returned to Hewlett Packard for warranty service the Buyer shall prepay shipping charges to Hewlett Packard and Hewlett Packard shall pay shipping charges to return the product to the Buyer However the Buyer shall pay all shipping charges duties and taxes for products returned to Hewlett Packard from another country Hewlett Packard warrants that its software and firmware designated by Hewlett Packard for use with an instrument will execute its programming instructions when properly installed on that instrument Hewlett Packard does not warrant that the operation of the instrument so
18. actual pulse e Set the trigger level at approximately the midpoint of the sync pulse This sets the trigger level just below the middle of the sync pulse and tells the oscilloscope to trigger on the leading edge o Set trig d auto to trig d This eliminates the possibility of a premature trigger event occurring e Select field 1 and line 1 e Press TIMEBASE and set time division to 100 ys div Trigger Menu 6 29 e Press DISPLAY and set persistence to 600 0 ms to accommodate video signals TV_TRIGGER hp running ee ee th en auto ee reeremnnrrrsverr iteatsansssanunsnenmnnmmnmee edge pettern state deicy ee Un a ae es Se ce ee aes i j 2 esi source 1 revel F327 500mnvV ieee a p line 500 000 us 0 00000 s 5090 000 us 100 us div 5450 1 WF BO stime 40 000 asf Se ee ad fine Figure 6 17 Trigger at Field 1 Line 1 The HP 54502A is triggering on the first equalizing pulse of field 1 the first pulse in the vertical interval The pretrigger data that is being viewed left half of the screen is field 2 lines 256 262 e Set time division to 10 ys div and set the trigger to field 1 line 10 Trigger Menu HP 54502A 6 30 Front Panel Reference aps Parcaneids TV_TRIGGER i eC tria d auto edge pattern siale deiaypivy EE aaa coh Seeed meee EEREN i H polarity ws 3 field e H iine 50 0000 us 0 00000 s 50 0000 us
19. fail if 11 8 falltime A 5 falltime measurements A 1 field Key 6 28 FINE key 3 8 4 1 firmware revision 12 1 form feed Key 12 3 frame 7 6 frequency A 5 Front Panel Overview 3 1 function display 3 10 Function Key 9 2 fuse module 2 4 Index 2 Gain cal 12 10 grid 7 6 H HARDCOPY Key 3 3 holdoff 3 5 hoidoff Key 6 3 6 10 6 16 6 28 HP IB interface 3 3 HP IB menu 12 2 Humidity 2 2 Input 3 9 Instrument Reset 3 11 Intensity Control 2 7 K key CLR MEAS 11 2 continuous 11 3 EOL 12 3 form feed 12 3 or if 11 8 Run Stop 3 2 save after 11 8 save to 11 8 standard user defined 11 4 abort 12 8 12 11 add to memory 10 3 HP 54502A Front Panet Reference AUTOSCALE 3 5 cal select 12 10 chan mem 9 3 channel 12 11 Clear Display 3 3 clear memory 10 3 clock 6 15 connect dots 7 7 continue 12 8 12 11 coupling 5 3 Delay 4 3 6 22 display 10 2 10 3 Display Mode 7 3 ECL 5 5 exit menu 12 3 12 6 12 8 12 11 fail if 11 8 field 6 28 FINE 3 9 Function 9 2 Hardcopy 3 3 holdoff 6 3 6 10 6 16 6 28 level 6 3 level polarity 6 28 line 6 28 Local 3 3 meas meas def meas limit 11 3 nonvolatile 10 2 7 5 off frame axes grid 7 6 offset 5 2 9 4 operand 9 3 operator 9 3 paper length 12 3 pattern 6 9 position 4 5 present 6 16 probe 5 4 qualify on 6 20 RECALL 3 5 reference 4 3 SAVE 3 6 sensitivity 9 4 HP 54502A Front
20. line 1 to 263 in field 1 e Iffield 2is selected choose from line 1 to 262 in field 2 This tv trigger mode is compatible with broadcast standard M If the 50 Hz 625 lines standard is selected the options are also dependent upon field settings e If field 1 is selected the range of lines is from 1 to 313 e If field 2 is selected the range of lines is from 314 to 625 This tv trigger mode is compatible with broadcast standards B C D G H I K K1 L and N The holdoff key enables the oscilloscope to hold off the trigger event from 40 ns to 320 ms and is incremented in 20 ns time frames HP 54502A Front Panel Reference a ceil TV Trigger Exercise instrument Setup Oscilloscope Setup HP 54502A Front Panel Reference Video signals are unique and as such have unique requirements for proper triggering This exercise demonstrates how to display and work with video signals on the HP 54502A Use a standard NTSC signal generator with clamped video output for this exercise Turn color bars on Connect the NTSC video signal to channel 1 of the HP 54502A e Press AUTOSCALE Select the ty trigger mode Set 60 Hz 525 lines and channel 1 as the source Determine the polarity of the sync pulse e Select the trigger level and rotate the knob until a stable display is attained When a sync pulseis visible determine the polarity select polarity press the function key and set the sync pulse in accordance with the
21. or falling edge of the source after the qualifying pulse The time settings for the qualifier are selectable from 20 ns to 160 ms The trigger occurrence value is selectable from 1 to 16 000 000 NOTE All TV trigger modes require a clamped video signal for stable triggering Use the HP 1133A TV Video Sync Pod to provide clamped video output that can be used in conjunction with the HP 54502A s TV triggering capabilities Trigger Holdoff Trigger can be held off either by time or events over the ranges e time 40 ns 320 ms e events 2 16 000 000 An event is defined as the specified trigger condition A separate holdoff setting time or events is available for each trigger mode except delayed trigger which is set to 40 ns Noise Reject Trigger Provides improved triggering on noisy signals by increasing trigger hysteresis internal trigger only Display Data Display Resolution 451 points horizontally by 256 points vertically Number of Screens 1 or 2 screens can be selected This can provide overlapping channels or memories for comparison or separate displays on a split viewing area Display Modes Averaging The number of averages can be specified in powers of 2 up to 2048 On each acquisition 1 n times the new data is added to n 1 n of the previous value at each time coordinate Averaging Specifications and Characteristics HP 54502A B 8 Front Panel Reference HP 54502A Front Panel Reference operates continuous
22. probe attenuation failure 12 8 probe cal menu 12 7 Q qualify on Key 6 20 R ram Test 12 5 range 6 10 Rear Panel Layout 2 3 RECALL 0 3 5 RECALL CLEAR 3 6 3 11 RECALL Key 3 5 reference Key 4 3 Repetitive Bandwidth 1 1 risetime A 5 risetime measurements A 1 rom Test 12 5 RUN STOP Key 3 2 3 3 S Sample Rate 1 1 SAVE Key 3 6 save to Key 11 8 Self Cal menu 12 10 HP 54502A Front Panel Reference selftest menu 12 4 sensitivity Key 9 4 service menu 12 11 set Key 11 8 Setup 3 4 Shipping 2 2 SHOW Key 3 6 SHOW screen 3 11 SINGLE Key 3 3 slope 3 5 slope Key 6 3 source Key 6 3 6 27 10 2 standard width A 4 standard width A 5 standard user defined Key 11 4 start cal Key 12 8 12 11 start marker 8 3 start test Key 12 6 State Trigger Exercise 6 16 state Trigger Mode 6 15 statistics Key 11 3 stop marker 8 3 Stopped mode 3 3 Storage 2 2 store Key 10 2 submenu attenuation 12 8 time null 12 9 Sweep speed 3 5 4 1 System Control 3 2 T talk only 12 2 talk only menu 12 2 Test loop 12 6 test Key 11 7 threshold 6 1 thresholds measurements Key 11 4 HP 54502A Front Panel Reference time Key 12 9 time null submenu 12 9 Time Div Key 4 1 Timebase 3 7 timebase Key 4 5 Timebase Menu 4 1 timebase window 3 5 9 3 Trig d auto Key 6 3 Trigger 3 7 delay 6 1 6 20 edge 6 1 6 2 pattern 6 1 6 8 state 6 1 6 15 tv 6 1 6 27 Trigger le
23. the trigger HP 54502A Trigger Menu Front Panel Reference 6 9 holdoff Key e when exited a trigger is generated on the first transition that makes the pattern false The pattern must be true and go false to generate a trigger e when present gt a trigger is generated when a trigger pattern is true longer than a specified minimum time period This time period is specified in the next selection key that is activated when present gt is selected The present gt time ranges from 20 ns to 160 ms e when present lt a trigger is generated when a trigger pattern is true less than a specified maximum time period This time period is specified in the next selection key that is activated when present lt is selected The present lt time ranges from 20 ns to 160 ms e range this trigger condition is a combination of present lt and present gt A trigger is generated when a trigger pattern is true for longer than a specified minimum and shorter than a specified maximum time period These time periods are specified in the next two selection keys that are activated when range is selected The first range time setting must be less than the second range time setting The holdoff key assigns the entry devices to control holdoff Holdoff disables the trigger circuit for a selectable time period or number of events after the trigger event Holdoff is selected in time units from 40 ns to 320 ms and is incremented in 20 ns intervals or by
24. the function is set with this key SD ae Vertical Scaling Units The fundamental measuring units of an oscilloscope are volts division in the vertical axis and time division on the horizontal axis This philosophy is used regardless of the mathematical function chosen No provisions have been made to manage units for all combinations of operands and operations For example apply a 2V signal to channel 1 and a 3V signal to channel 2 The HP 54502A displays the product as 6V when in reality it is 6V ZZ ese __ _ _ _ Displaying Functions Waveform Math Menu 9 4 The HP 54502A has several screen variations available to accommodate a 2 channel display as well as two functions e The single screen mode with a function on the mathematical results are displayed in the bottom half of the screen while the operands are superimposed in the top half of the screen HP 54502A Front Panel Reference HP 54502A Front panel Reference x Y Channel 1 2 Viewing Area a z r p Function 1 2 Viewing Area traat 5450 AW S2 Figure 9 2 Single Screen w Function On In the dual screen mode the functions are again displayed in the bottom half of the screen however the dual screens are displayed in the top half hp J ee n Channel 2 Viewing Area 7 Channel 1 Viewing Area BAURI BA EET iy a Sa da hte be i Function 1 Viewing Area Function 2 Viewing Area
25. x delta t 250 ps Trigger Sensitivity Internal de to 100 MHz Real time and repetitive 0 5 division Specifications and Characteristics B 1 Internal 100 MHz to 400 MHz Real time N A Repetitive 0 125 x full scale External de to 250 MHz 100 mVp p into 500 NOTES Specifications valid for temperature range 10 C from software calibration temperature with eitht or more averages selected 1 Upper bandwidth reduces by 2 5 MHz for each C above 35 C For time div ranges 1 us div and slower bandwidth in repetitive mode is 100 MHz 2 Rise time figures are caiculated from tr 0 35 Bandwidth 3 On ranges lt 50 mV div the maximum overdrive of the input must not exceed 1000 times the V div setting 4 Expansion is used below 7 mV div range so vertical resolution and accuracies are correspondingly reduced Below 7 mV div full scale is defined as 56 mV 5 Vertical gain accuracy decreases 0 08 per C from software calibration temperature Characteristics The following are performance characteristics of the HP 54502A Digitizing Oscilloscope Vertical Switchable Bandwidth Limits ac coupled lower 3 dB frequency 90 Hz LF reject lower 3 dB frequency 450 Hz bandwidth limit upper 3 dB frequency 30 MHz Number of channels 2 simultaneous Vertical Sensitivity Range 2 mV div to 5 V div Vertical Gain Accuracy dc 2 0 of full scale Vertical Resolution 0 4 of full scale Maximum Sample Rate Rea
26. 02A cannot make a measurement When any of the user defined measurements are requested the HP 54502A still must determine the top base voltage thresholds From this information it can determine user defined upper and lower thresholds The mid point is then determined to be the 50 point between the upper and lower threshold EEN O OO IT Automatic Top Base Algorithms A 2 Top Base is the heart of most automatic measurements It is used to determine Vtop and Vpase the 0 and 100 voltage levels at the top and the bottom of the waveform From this information the oscilloscope can determine the 10 50 and 90 points which are also used in most measurements The top or base of the waveform is not necessarily the maximum or minimum voltage present on the waveform Consider a pulse that has slight overshoot It would be wrong to select the highest point of the waveform as the top since the waveform normally rests below the perturbation Top Base performs a histogram on the waveform and finds the most prevalent point above and below the waveform midpoint The most prevalent point is one that represents greater than approximately 5 of the total display points 501 and is considered to be either the top or base If no point accounts for more than 5 of the total then the top is chosen as the absolute maximum and the base is chosen as the absolute minimum HP 54502A Front Panel Reference i Ed ge Definition Both rising and falling e
27. 1 volt 2 kHz square wave with adequate offset to display the signal at midscreen HP 54502A Front Panel Reterence Set up an HP 8116A Pulse Function Generator or another signal generator that is capable of the same signal Mode NORM Set AMP 1 00 V Set FRQ 2 kHz Set DTY 50 Set OFS 1 20 V Set signal to squarewave e 00 9e oo Setting the Input this signal to channel 1 on the HP 54503A and disconnect any inputs Oscilloscope to any other channel e Press AUTOSCALE see Figure 4 2 TIME BASE Ap running OT LT TET LETT ET LTT 200 us div rc 250 kSa s defay 00000 os i rert fonts rion 4 po window nemm i off EJ i A pm timebose _ coon F arr i i i i T omre E Eco realtime 54502024 oS tr ss Os fee Sse oe OP 4 2 Input Signal for Window Viewing HP 54502A Timebase _Front Panel Reference 4 7 Select the TIMEBASE menu key e Press the selection key to turn on the window function e Set the window timebase to 40 ys div see Figure 4 3 ___TIMEBASE hp running 7 a E EE EET f H ere iat a m sin pee a 0 00209 s reference mm left mn right pes 4 4 j D a xi i K ur Q ben we T L CTT tr ma timebase 40 0 us div posi tior lt an O OOOO S S4502w48 EEE LEE TET TT TET 4 3 Input Signal with Window Turned On Note The timebase fac
28. 6 hp running DELAY TRIGGER r R EO e e ria ag cuto S edge poitern H i state tv j ouglify on Ess poitern state deicy time 2 50000 us 0 00000 s 2 50000 us 500 ns div i trigger on count 7 H j of on 1 Figure 6 16 Ten Burst Pulse Triggered on Puise 9 BAR 54502W17 By setting the oscilloscope to the delay trigger mode a specific time or count to delay between qualification and trigger can be added In this exercise the trigger was delayed to get a stable display When the time delay had elapsed the HP 54502A began counting rising edges until it found the ninth edge Trigger Menu HP 54502A 6 26 Front Panel Reference TV Trigger Mode TV TRIGGER trig edge patiern state serao COREE inesh source t fevel f250 000 mv polarity T rp fieia Ns cline are ee AAAI ONC Of me time 0 000 ns A a 545017WF 17 Standard Select Key The TV TRIGGER menu enables the HP 54502A to trigger on clamped tv signals The two most common tv standards 60 Hz 525 lines or NTSC is the standard used in the United States 50 Hz 625 lines is the standard used in most European countries This trigger menu also allows for user defined tv signals that may be used in other parts of the world To move the highlighted inverse video window within a field you must press the selection key and to change the value displayed in the window you must rotate the kn
29. Algorithms A 6 Viop Vbase Vam p Vavg Vrms Viop most prevalent point above waveform midpoint Vbase most prevalent point below waveform midpoint Vamp Viop Voase Average voltage of the first cycle of the displayed signal is measured If a complete cycle is not present the oscilloscope will average all data points The rms voltage of the first cycle of the displayed signal is measured If a complete cycle is not present the measurement will compute rms on all data points i 2 1 2 Vims ac 1 n Z a1 Vj Ind Vj HP 54502A Front Panel Reference B Specifications and Characteristics SEAS aA RR RST ERT I Ta ON RS ET E Specifications Vertical Horizontal Trigger HP 54502A Front Panei Reference The following are performance specifications for the HP 54502A Digitizing Oscilloscope Bandwidth 3dB de coupled Real time dc to 100 MHz Repetitive dc to 400 MHz Risetime Realtime 3 5 ns Repetitive 875 ps Input R selectable 1 MO 1 or 500 1 Maximum Input Voltage 1M 250 V de peak ac lt 10 kHz 500 5 Vrms Offset Accuracy 2 mV 2 of ch offset 2 5 of full scale Voltage Measurement Accuracy dc a Dual Cursor 2 0 of full scale 0 032 x V div Single Cursor 2 0 of full scale offset accuracy 0 016 x V div Time Base Reference Accuracy 0 01 Delta t Accuracy Real time 2 x s div 0 01 x delta t 500 ps Repetitive 2 x s div 0 01
30. Comfortable with Digitizing Oscilloscopes SEE instrument Setup 2 1 Available Accessories CNN eI Operating Environment Storage and Shipping instrument Setup 2 2 The following optional accesories are available for use with the HP 54502A Carrying Case HP Part Number 1540 1066 Rack Mount Kit HP Part Number 5061 6175 HP 1180A Testmobile HP 1133A TV Video Sync Pod HP 10024A Integrated Circuit 16 pin Test Clip HP 10211A Integrated Circuit 24 pin Test Clip PC Board Horizontal Mini Probe Socket HP Part Number 1250 1737 PC Board Vertical Mini Probe Socket HP Part Number 1250 1918 oe 8 The HP 54502A oscilloscope is operated in a normal lab or bench environment without any additional considerations Note the non condensing humidity limitation in the list of characteristics supplied in this manual Condensation in the instrument cabinet can cause poor operation or malfunction Protection should be provided against temperature extremes which cause condensation The HP 54502A may be stored or shipped in environments with the following limitations e Temperature 40 Cto 75 C e Humidity Up to 90 at 65 C e Altitude Up to 15 300 meters 50 000 feet If the HP 54502A is to be shipped to a Hewlett Packard Service Center for service or repair attach a tag to the instrument identifying owner address of owner complete instrument model number and serial number and a description of requ
31. DNS E E Introduction to The DISPLAY menu controls most of the features that dictate how the the Di spl ay acquired data is displayed These features include ways to manipulate data for clarity to eliminate noise viewing best case worst case situations or the displayed background There are two display menus depending on which acquisition mode the oscilloscope is set to in the TIMEBASE menu This chapter describes the DISPLAY menu the submenus how to control all the features and how to display the most meaningful waveform for measurements l DISPLAY Menu norm H i persistence minimum 2bams infinite connect dots off on t i of screens of screens 1 2 Ee of screens off frome axes grid off frame l of f frame axes grid axes grid foe ae egy al i connect dots connect dots j off on offon 54502821 r Figure 7 1 Repetitive Acquisition Mode Display Menu HP 54502A Display Menu Front Panel Reference 7 1 ee ee Rey ed DISPLAY Menu persistence offon of screens T 1 2 a off frame axes grid H display record i norm extended filter off on single infinite connect dots 12848 i i of screens i 1 2 off frame axes grid connect dots offon rormariewanenanaanse displey record noerm extended filter offon of sc reens 1 2 off
32. ED PASSED PASSED PASSED PASSED PASSED HP 54502A Front Panel Reference Acquisition Miscellaneous System RAM Non Volatiie RAM Display RAM Protected Non Votatile RAM System ROM Acguisition RAM Logic Trigger Timebose D A Converter HPTIB SELFTEST MENU i mis icop e E ispia acq i system nonvol s 3 te rat lt ee start test ae AT test ail i exit menu tes ie SEESE 54501W75 Figure 12 4 Results of Selftest Utility Menu 12 5 ram Test rom Test acquisition Test Miscellaneous Test loop Test start test Key test all exit menu Key Utility Menu 12 6 The RAM test is a multiple selection field The options are display acquisition system unprotected nonvolatile memory Two ROM tests are available e system e protected nonvolatile memory Five acquisiton tests are available atrig ltrig A D timebase D A eee 8 Three miscellaneous tests are available e HP IB keyboard CRT The loop test is a function designed for use by qualified service personnel It is unnecessary to use this function for normal oscilloscope operation When a self test loop has been initiated it runs until stopped by pressing and holding any key Pressing this key begins the selected test This key runs all tests in sequence Pressing this key returns the Utility menu to the screen HP 54502A Front Panel Reference S SsS
33. It is possible to stop acquiring clear the display and capture one acquisition for evaluation The display can be cleared while acquiring to capture new data The acquisitions can be manipulated with these three keys and other keys and settings are not affected The LOCAL key sends a return to local control message to the HP IB interface and returns control to the front panel This key can be locked out if a local lockout command is executed over the HP IB This is the only active front panel key while the oscilloscope is in remote operation if it has not been locked out The HARDCOPY key executes an immediate hardcopy of the currently displayed data on a compatible graphics printer and stops all other oscilloscope functions while printing The oscilloscope must be in talk only and the printer must be in listen always Setup of the hardcopy options are accessed in the HP IB submenu see Chapter 12 Utilities Menu Selection of any key aborts the hardcopy action Front Panel Overview 3 3 eee Setup The SETUP section of the front panel controls subsystems for proper display of input data This section controls display information e AUTOSCALE for automatic scaling of the waveform display area e SAVE and RECALL setups e Quick access to channel function and trigger information on the SHOW screen 54502E63 i 3 i SCALE E g i gi fa P ish aes a Figure 3 3 Setup Section Froni Panel Overv
34. Panel Reference set 11 8 SHOW 3 6 single 3 3 slope 6 3 source 6 3 6 27 10 2 start cal 12 8 12 11 Start test 12 6 Statistics 11 3 store 10 2 test 11 7 thresholds measurements 11 4 Time Div 4 1 timebase 4 5 trigger on 6 23 TTL 5 5 Vertical Sensitivity 5 2 volatile 10 3 waveform pixel 10 1 when 6 9 6 15 window 4 4 Key down power up 3 11 knob 3 8 3 9 L level Key 6 3 level polarity Key 6 28 line Key 6 28 Line Switch 2 7 line voltage selector 2 4 List of Accessories 2 2 LOCAL Key 3 3 loop Test 12 6 M Making Measurements A 1 Maximum Vertical Sensitivity 1 1 Index 3 meas Sub menu 11 3 meas meas def meas limit Key 11 3 Measure Define 11 4 Measure Limit 11 7 measurement limit test 3 5 Measurement Selection 11 2 Measurement Setup A 1 Memory 0 3 5 menu channel 5 1 Menus 3 7 Minimum Vertical Sensitivity 1 1 N noise reject Key 6 3 nonvolatile Key 10 2 nonvolatile memory 10 2 of screens Key 7 5 numeric keypad 3 8 O offset Key 5 2 9 4 Offset hysteresis trigger cal 12 10 1 delta t 8 3 Operating Environment 2 2 Operator Key 9 3 or if Key 11 8 P paper length Key 12 3 pattern Key 6 9 Pattern Trigger Exercise 6 10 Index 4 pattern Trigger Mode 6 8 period A 5 pixel Menu 10 3 position Key 4 5 power input 2 3 Power Requirements 2 3 power switch 2 3 present Key 6 16 probe attenuation 5 4
35. Ra AR e a EO RE SN TL I FS IE RT NA RAE Front Panel Reference HP 54502A 400 MHz Digitizing Oscilloscope LA eackarn Copyright Hewlett Packard Company 1989 Publication 54502 90901 Printed in the U S A September 1989 Printing History New editions are complete revisions of the manual Update packages which are issued between editions contain additional and replacement pages to be merged into the manual by the customer The dates on the title page change only when a new edition is published A software code may be printed before the date this indicates the version of the software product at the time the manual or update was issued Many product updates and fixes do not require manual changes and conversely manual corrections may be done without accompanying product changes Therefore do not expect a one to one correspondence between product updates and manual updates Edition 1 July 1989 54502 90901 List of Effective Pages The List of Effective Pages gives the date of the current edition and of any pages changed in updates to that edition Within the manual any page changed since the last edition is indicated by printing the date the changes were made on the bottom of the page If an update is incorporated when a new edition of the manual is printed the change dates are removed from the bottom of the pages and the new edition date is listed in the Printing History and on the title page Pages Effective Date a a
36. Rate Approx 120 Kbytes per second Probe Compensation ac Calibrator Output A 500 Hz approx square wave is provided for probe compensation A probe to BNC adapter is used to connect the probe to the rear panel Probe Compensation BNC output During instrument self calibration this output is used to provide other calibration signals as described in the Service Manual This same BNC connector is used for trigger output The utility menu allows the user to switch the BNC from probe compensation and calibration signals to a trigger output pulse The rising edge with amplitude from approximately 400 mV to 0 V when terminated into 502 is synchronous with system trigger The falling edge of this pulse occurs approximately at the end of holdoff The rising edge should be used as the edge synchronous with trigger de Calibrator Output This output is used for vertical calibration of the HP 54502A as described in the Service Manual Specifications and Characteristics HP 54502A B 12 Front Panel Reference Product Support Built in Self test and Calibration Routines Internal self test capabilities provide a 90 confidence the instrument is operating properly External test procedures in the service manual provide a 100 confidence Self calibration routines also selected through the front panel utility menu ensure that the instrument is operating with its greatest accuracy and requires no external test equipment Low Cost of Owner
37. TIL Each of these menus is discussed in the following chapters lo g 0 il EREE p oI f acooall ollo 00000 0000 00 0000 l jlo jae a 54502E04 A a j ine TRIG forseray 4 D a O MATH SAVE Figure 3 4 Menus Section HP 54502A Front Panel Overview Front Panel Reference 3 7 Entry Numeric Keypad Front Panel Overview 3 8 The ENTRY device section contains a multi function numeric keypad a selection knob and a FINE key ENTRY oa ett enter RISETIMG PAL tae FREG PERIOO i FINE j C 1 20 C iy w a oe i x amp E 2 Sy lt o je o m u z Y PP Y MIN Y WAX v acon 4 2 us E nd 4 Y NAP v BASE v to y avG BOR FOL 5 a na E TLR MEAS Ta CLEAR Figure 3 5 Entry Section The keypad is for direct numeric input To input known values directly press the associated softkey to activate the desired field on screen and then select the units with the numeric keys For example to set the vertical sensitivity to 500 mV e Ensure V div in the Channel menu is the active field displayed in fullbright e Press 5 0 0 mv in sequence HP 54502A Front Panel Reference Knob FINE Key The blue key on the numeric keypad selects the alternate function when pressed before the key The alternate function of the keys on the right column are measurement units The CLEAR key clea
38. Trigger HP 54502A Front Panel Reference Time Qualified Pattern Trigger A trigger will occur on the first edge to exit a pattern only if it meets the specified time criteria The available time qualified modes are e pattern present lt time pattern present gt time range pattern present gt timel and lt time2 The time settings are adjustable from 20 ns to 160 ms 3 2 ns The time filter recovery time is lt 12 ns In the pattern present lt time mode the pattern must be present gt 1 75 ns repetitive mode 7 0 ns for the real time mode for the trigger to respond Glitch Trigger Use pattern present lt time with time selected such that it is just less than the nominal pulse width of the signal you are analyzing The minimum glitch width is 1 75 ns repetitive mode 7 0 ns for the real time mode and 2 8 ns for external trigger State Trigger A pattern is specified on any two of the three inputs with the third input used as clock A trigger will occur on the rising or falling edge of the input specified as the clock when the pattern is present or not present Setup time for the pattern with respect to the clock is lt 10 ns hold time is zero Event delayed mode The trigger can be qualified by an edge pattern time qualified pattern or state The delay can be specified as a number of occurrences of a rising or falling edge of any of the three inputs After the delay an occurrence of a ris
39. alified Note Time delay is not available in the time qualified pattern settings of when present gt when present lt or range e Press the function key until the highlight is on the first numeric field This field selects the amount of delay after qualification ranging from 30 ns to 160 ms delay count delay by edges disables the trigger circuit for a selected count from 1 to 16 000 000 after the trigger has been qualified After the selected count has been attained the HP 54502A looks for the user specified trigger edge e Press the function key until the highlight is on the first numeric field This field to selects the number of edges to delay after the trigger has been qualified from 1 to 16 000 000 e Press the funtion key once more to activate the rising edge falling edge option and select the desired edge with the knob e Press the function key once more to highlight the third option field and select the channel to delay on Press the function key a fourth time to return to the first numeric field HP 54502A Front Panel Reference trigger on Key This key selects a specific edge to trigger on after the qualification and delay conditions have been satisfied All other keys in this menu have dealt with defining qualifying conditions however this field sets the trigger point This is another three position option switch e Press the function key to highlight the numeric field and select which occurrence to trigge
40. alk only mode 12 2 addressed mode 12 3 EOI Key 12 3 form feed Key 12 3 paper length Key 12 3 exit menu Key 12 4 selftest menu 12 5 ram Test 12 5 rom Test 12 6 acquisition Test 12 6 Miscellaneous Test 12 6 loop Test 12 6 start test Key 12 6 exit menu Key 12 7 probe cal menu 12 8 attenuation submenu 12 8 channel Key 12 8 start cal Key 12 8 continue Key 12 8 abort Key 12 8 exit menu Key 12 9 time null submenu 12 9 channel Key 12 9 time Key 12 9 exit menu Key 12 10 Self Cal menu 12 10 cal select Key 12 10 channel Key 12 10 start cal Key 12 11 continue Key 12 11 abort Key 12 11 exit menu Key 12 11 service menu 12 11 clicker Key 12 12 Calibration Procedure i aa Appendix A Algorithms A 1 Measurement Setup A 1 Making Measurements A 2 Automatic Top Base A 3 Edge Definition A 3 Algorithm Definitions A 3 delay A 4 width A 5 width A 5 Period A 5 Frequency A 5 Duty Cycle A 5 Risetime A 5 Falltime AS Vmax A 5 Vmin A 5 Vo A 6 Vtop A 6 Vbase A 6 Vave A 6 Vims S TTT Appendix B Specifications and Characteristics Introducing the HP 54502A 1 Introduction The HP 54502A 400 MHz Digitizing Oscilloscope is a general purpose repetitive and realtime oscilloscope fully programmable and transportable The HP 54502A has two input channels and an external trigger input Full HP IB programmability is incorporated into the HP 54502A and may be used in a broad range of HP IB applications from high
41. apped directly onto the display and displayed in halfbright There are no measurement capabilities on pixel memories Pixel memories are additive When all pixels are full add to memory will merely overwrite existing data display Key This key toggles the selected pixel memories on or off clear memory Key This key purges all data from the selected pixel memory add to memory Key Pressing this key adds the currently displayed waveforms to the specified pixel memory HP 54502A Waveform Save Menu Front panel Reference 10 3 bannen eee Waveform Save This exercise demonstrates how a waveform is stored the offset setting Exercise changed and the stored waveform recalled to be compared with the current display Instrument Setup Set up an HP 8116A or a signal generator capable of a 6 kHz 1 volt squarewave e Mode NORM e FRQ 6 00 kHz e DTY 50 e AMP 1 00V e OFS 0 00V e Pulse squarewave Oscilloscope Setup This procedure assists in setting up the HP 54502A for optimal viewing Waveform Save Menu 10 4 Connect this signal to the Channel 1 input Press AUTOSCALE Press WFORM SAVE and select the waveform submenu Press the nonvolatile key until m3 is selected Press the source key until chan 1 is selected HP 54502A Front Panel Reference e Press the store key The currently displayed waveform is saved in nonvolatile memory m3 The remainder of this exercise demonstrates how to recall the stored wavefor
42. arker 2 Vmarker 1 Delta t Delta V Menu 8 2 This function key toggles the markers on and off With the AV function turned on the next two fields are activated allowing individual control of the two markers When the AV markers are turned on Vinarker2 Vmarkerl and delta V appear in the factors display area The delta V entry is calculated as the following Vmarker 2 Vmarker 1 delta V If delta V is negative Vmarker 1 is located at a more positive voltage level than Vmarker 2 This function key is a two function control field The first selection is the desired channel memory or function to place Vmarker 2 for measurement By pressing the key again the highlighted field moves to the numeric display to select the voltage level Typically place Vmarker 2 at the desired level on the waveform display and read the level in the highlighted field and in the factors area of the waveform display Vmarker 2 is the voltage marker with shorter dashes Vmarker 1 operation is identical to Vmarker 2 except it is represented by longer dashes NOTE The markers can be moved on a selected source even though that source is not displayed Make sure that the markers are assigned to the proper source to be measured or the numeric field may be incorrect HP 54502A Front Pane Reference At markers S N markers m i i H coast ee mA markers Coo M stort marker 84 0000 us i r stop mar
43. ature changes more than 10 C from the temperature at full calibration e the user would like to optimize measurement accuracy Self cals do not require any equipment other than cables It is necessary to UNPROTECT the calibration which may not be allowed in some circumstances Follow the Self Cal Menu calibration procedures to perform this first level of self cal The second level of self calibrations are to be performed only by qualified service personnel with access to the service manual Note Before the HP 54502A can be calibrated the CALIBRATION toggle switch on the rear panel must be set to UNPROTECTED The procedure for calibration is e Set the rear panel CALIBRATION switch to UNPROTECTED e Select 0 in the cal select field and calibrate the vertical factors This routine calibrates the A D vertical gain offset and trigger with the rear panel dc calibator signal HP 545024 Front Panel Reference Select 1 in the cal select field and calibrate the delay and the repetitive factors This procedure uses the rear panel ac calibrator signal When the software calibrations are complete reset the CALIBRATION toggle switch on the rear panel to PROTECTED HP 54502A Utility Menu Front Panel Reference 12 13 Index oma Dt DV markers 3 5 width A 4 width A 5 A abort Key 12 6 12 8 12 11 acquisition test 12 5 add to memory Key 10 3
44. ca india i Japar AR TOOS 19 sPart number chown for plyg is industry identifier for plug only Number shown for cabia is HP port number Tar complete cable ineludiag pieg seThage Cords ore inghuded in the CSA certification approve of the equipment E farth Ground L Line NeNeutral Figure 2 5 Available Power Cords Instrument Setup 2 6 HP 54502A Front Panei Reference Line Switch Intensity Control Air Flow Requirements HP 54502A Front Panel Reference The line switch is located on the rear panel Turn on the oscilloscope by pressing 1 on the rocker switch The rocker switch is labelled 1 and 0 corresponding to on and off 54501 EXOB Figure 2 6 Intensity Control Once the oscilloscope has been turned on the display intensity can be adjusted if necessary The intensity is adjusted with the Display Intensity control on the rear panel The HP 54502A must have unrestricted air flow for the fan and ventilation openings in the rear panel The HP 54502A may be stacked under over or between other instruments provided the the other instruments are adequately cooled instrument Setup 2 7 rte ee ee _ ee Connecting External Equipment Instrument Setup 2 8 The HP 54502A is equipped with an HP IB connector on the rear panel This allows a direct connection to an HP IB compatible printer plotter or external controller Connect a
45. creen If the oscilloscope is auto triggered and the sweep speed is 200 ms div 500 ms div 1 s div 2 s div or 5 s div it operates in the auto triggered scroll mode and displays data points as they are acquired see Chapter 4 Timebase Menu The source key selects the trigger source The options are channels 1 or 2 or external trigger The current selection is highlighted in inverse video The level key to sets the trigger level The range on this function is 12 divisions from center It provides flexibility for setting exact triggering points and specifies levels used in the more sophisticated triggering modes This field is not labeled however the available selections are graphic representations of the rising edge and falling edge The current selection is highlighted in inverse video Turn noise reject on for triggering on noisy signals without the problem of false triggering Pressing the holdoff key assigns the entry devices to control holdoff Holdoff disables the trigger circuit for a selectable time period or number of events after the trigger event Holdoff is selected in 20 ns time increments from 40 ns to 320 ms or in number of events from 2 to 16 000 000 Time and event number of patterns patrn are toggled with the knob Trigger Menu 6 3 i ccc cccacaaaaacacaacsaccacscasccaasaassaaaa ae Holdoff This exercise sets up the oscilloscope and a signal generator to view some Exercise of the features of the edge tr
46. d HP 3630A Option 002 PaintJet The following plotters have been tested successfully with the HP 54502A HP 7440A Option 002 Color Pro HP 7470A Option 002 HP 7475A Option 002 HP 7550A and HP 9872C Pressing exit returns the UTILITY menu to the screen Utility Menu 12 3 rrr eee SELFTEST MENU SELFTEST MENU rn mise loop Se Tee e d ispioy acg system nonvel j seai stort test p AEEA canduis bt EEAO EPOE a 1 test all exit mens 54503 WE 68 Utility Menu 12 4 The HP 54502A is designed to perform internal diagnostics This selftest submenu tests the oscilloscope to give a high confidence level of instrument functionality Before starting any self test always perform a key down power up RECALL CLEAR This resets critical parameters to known values to assure erroneous test failures do not occur UTILITY selftest menu eaters i A system OL eed protect system stort test DE f stort test Beane test all 34502022 Figure 12 3 Self Test Menu HP 54502A Front Panel Reference If the HP 54502A fails any selftest perform the following e Recalibrate the oscilloscope e Ifthat does not fix the problem refer to the HP 54502 Service Manual The HP 54502A self diagnostics and self tests are designed to run operational tests on the following RAM ROM o PASSED PASSED PASSED PASSED PASSED PASS
47. dge trigger Interaction menu and is independent for each channel It is carried over to all other modes except the TV trigger mode These levels are important settings because the high and low levels in the pattern state and delay modes are defined as being greater than or less than the trigger level The ievel for TV trigger mode is a special case and is set in the TV trigger menu HP 54502A Trigger Menu Fronm Panel Reference 6 1 rr Edge Trigger Mode Trigger Menu 6 2 The edge trigger mode has the following selections e SEE SE amp Trig d auto Trigger source Trigger level adjust Slope Noise reject Holdoff TRIG MENU H EDGE TRIGGER tnt trig d auto source 1 2 EXT level edjust aoe noise reject i H kotdoff i SA Shes t 1 Figure 6 1 Edge Trigger Menu HP 54502A Front Panel Reference trig d auto Key source Key level Key slope Key noise reject Key holdoff Key HP 54502A Front Panel Reference The trig d auto selection toggles between the two trigger modes The current selection is displayed in inverse video This field is available in all trigger menus In the trig d mode the oscilloscope does not acquire data until all of the trigger requirements are satisfied In the auto mode if a trigger is not found a trigger is generated and acquired data is displayed A status message is displayed in the upper left corner of the s
48. dges are defined as transitional edges that must cross three thresholds A rising edge must cross the lower threshold in a positive direction defining it as a rising edge cross the mid threshold any number of crossings both positive and negative are permissible and then cross the upper threshold without any crossing of the lower threshold A falling edge must cross the upper threshold in a negative direction cross the mid threshold any number of times and then cross the lower threshold without crossing the upper threshold Note Most time measurements are made based on the position of the first crossing of the middle threshold a a Te Algorithm Following are the definitions that all measurements are based on Definitions delay There are three types of delay measurement e jitter standard e user defined Jitter occurs only under the following circumstances standard user defined key is set to standard two delay parameters are the same e display mode is envelope HP 54502A Aigorithms Front Panel Reference A 3 if first edge on minimum waveform is rising then delay mid threshold of first rising edge of max waveform minus mid threshold of first rising edge on min waveform else delay mid threshold of first falling edge on min waveform minus mid threshold of first falling edge on max waveform The standard delay measurement occurs when in the standard mode not user defined and is not a jitter measurem
49. e Key active menu is highlighted Each memory type waveform or pixel has a separate menu When this key is pressed the rest of the menu changes HP 54502A Waveform Save Menu Front panel Reference 10 1 waveform Menu WAVEFORM SAVE 5 oe ee aN waveform pixe a Eae m3 ma r display ee ca gt I a pm Source chong 2 i tune 1 2 Fane ome store S4502WO5 nonvolatile Key display Key source Key store Key Waveform Save Menu 10 2 The waveform menu has four available memories m1 m2 m3 and m4 These memories are nonvolatile and will not be cleared during AUTOSCALE RECALL CLEAR or recycling power This permits disconnection of power and transportion of the oscilloscope without losing the contents of waveform memories A waveform memory consists of a single waveform record including the horizontal and vertical scaling parameters This allows measurements on previously stored waveform and function data Voltage and time markers can be set on waveforms when they are displayed however the time markers follow the TIMEBASE menu time division and not that of the memory waveform When the HP 54502A is in the envelope display mode and a waveform store is executed the min value and max value are stored separately The min value will be stored in m1 if m1 or m3 are the selected store locations or m2 if m2 or m4 are the storage locations The max values are stored in m3 or m4 respect
50. e 7 3 Dual Screen Display When waveform math functions or the dual timebase window are turned on they are displayed in the lower half of the screen and the channels are displayed in the top half HP 54502A Display Menu Front Panel Reference 7 5 es __ er a ITT off frame axes grid Key Display Menu 7 6 This unlabelled field selects one of four display backgrounds e off turns the background graticule off The displayed waveform and waveform information is not turned off e frame displays the outside border with a measurement scale The measurement scale is incremented decremented with major divisions and minor divisions based on the vertical and horizontal measurement settings e axes displays a background with the measurement scale crossing at mid screen e grid background is a complete graticule with ten horizontal major divisions and eight vertical major divisions Only the axes portion of the graticule has a minor division scale HP 54502A Front Panel Reference a ne connect dots Connect the dots is a technique used to display waveforms with all data Key points connected This makes viewing the waveforms easier because the signal is complete and has no breaks Note Connect the dots does not interpolate data and generate data points The HP 54502A connects data points linearly DISPLAY hp running i DO R EA eo ew s persistence of screens Cl e a eee i m tonneg dots off
51. e es eee ee ee ee 50 000 ns 0 00000 s 50 000 ns 10 0 as div ecg ea aia mace S4502W34 Figure 6 11 Channel I Clock LX State Trigger Menu HP 54502A 6 18 Froni Pane l Reference HP 54502A Front Panel Reference Channel 1 is displayed in the top screen To satisfy the conditions of the bit pattern channel 2 must be low lower than the channel 2 trigger level or less than 200 mY When the signal on channel 1 goes higher than 200 mV and channel 2 is still low less than 200 mV the pattern conditions have been satisfied the HP 54502A triggers e Change the bit patternto LX and select the is not present condition To satisfy this bit condition the clock channel must go low while channel 2 is high The oscilloscope triggers on the falling edge of channel 1 when the L on channel 2 is not present i e channel 2 is high F STATE TRIGGER hp cunning neem oan N nenanem areren eeren teal TY 4 edge pattern i r Fetate ce icy ty 1 srete bom lock meee l D EX Neee r when aeaaaee i e a eT 4 3 f present 4 z 50 000 nas 0 00000 s 50 000 rns 10 0 ns div z hoidaff EA ra SaSO2W3S Figure 6 12 Channel 1 Clock LX State Trigger Menu 6 19 Wn Delay Trigger Mode DELAY eo edge pettern stategdelayfiv siate TRIGGER dualify an pattern Fy 2 ExT Fa Joon sa of ptf ioger on count of a on 4 54502W13 qualify on K
52. e greater than 0 5 and a frequency greater than 50 Hz Auto scale is operative only for relatively stable input signals Save Recall Four front panel setups 1 4 may be saved in non volatile memory Recall Clear Pressing the RECALL key followed by the CLEAR key resets the HP 54502A to its factory default settings Specifications and Characteristics B 11 Recall 0 If Auto Scale ECL or TTL preset or recall setup are inadvertently selected recall 0 restores the instrument to its last state prior to selection Show Displays instrument status including volts div offset and trigger condition Hardcopy The CRT display including menus and measurement answers can be transferred directly to an HP IB raster graphics printer including the HP 2225A ThinkJet HP 2227B QuietJet or other compatible printers Full HP IB The HP 54502A is fully programmable Instrument settings and Prog rammability operating modes including automatic measurements may be remotely programmed via HP IB IEEE 488 HP IB programming complies with IEEE 488 2 1988 Standard Codes Formats Protocols and Common Commands Data Acquisition and Transfer Rate A 500 point data record can be acquired and transferred to a computer at a rate of approximately 10 times per second as tested with an HP 9000 Series 200 Controller The acquired data was type normal completion criteria 100 with the oscilloscope at a time division setting of 5 s div Data Transfer
53. eee pom probe col menu i pae Self cal menu service menu r D Gitcker otten i i ac BNC probe comp trigger curt cut e Figure 12 1 Utility Menu Utility Menu 12 1 HP IB menu HP TE ie ToT HBtolk on iy addressed r EOI off rm form eiea off i m poper length t E E prdev ice mode i j A errereen ne ema naasa asasan fo a ee ee i i exit menu yaran aassnsnsnssnanr 54S503WO talk only mode addressed mode Utility Menu 12 2 The HP IB submenu makes settings so the HP 54502A can talk to peripheral devices This interface includes two primary settings e Talk only mode e Addressed mode UTILITY H HP IB meny i i Fk tolk addressed oniy H H H i address Peo 2 3 i aff on form feed i off on paper tengih 11 in 412 ind Ae ae gevice mode i peint plot U assnsssninnanssssamamasnstksn tiaia OTE TTTOETE hmt ex Et menu Tanaina 54503803 Figure 12 2 HP IB Menu Set the oscilloscope to talk only to perform a hardcopy without intervention from an external controller The attached printer must be set in the listen only or listen always mode This mode selectively addresses the HP 54502A for talking or listening The address of the HP 54502A can be selected while the instrument is in the addressed mode The range of available addresses is 0 30 HP 54502A F
54. elected edge when the pattern is true and is present is selected or a trigger occurs when the pattern is false and not present is selected The holdoff key assigns the entry devices to control holdoff Holdoff disables the trigger circuit for a selectable time period after the trigger event Holdoff is selected in 20 ns time increments from 40 ns to 320 ms or for events count of states 2 to 16 000 000 Time and event are toggled with the knob a State Trigger Exercise Instrument Setup Trigger Menu 6 16 This exercise demonstrates how an input pattern is used to qualify a clock edge as a trigger State triggering extends the logic triggering capability of the HP 54502A by selecting one of the inputs as a clock and using the other inputs as qualifiers This is useful when it is necessary to synchronize the display with a system clock to detect a system state For example consider a synchronous memory bus The state trigger mode enables only those events that occur when reading from a block of memory to be captured and displayed To perform the following exercise use an HP 8116A Pulse Signal generator or another signal generator capable of the same 1 MHz 1 volt square wave HP 54502A Front Panel Reference Oscilloscope Setup HP 54502A Front Panel Reference Set up the HP 8116A as follows e Mode NORM e FRO 1 00 MHz e DTY 50 e AMP 1 00V e OFS 200mV Connect the signal to a BNC tee on channel 1 us
55. ence 4 4 Timebase 4 2 When using slow sweep speeds 200 ms div to 5 sec div there are two acquisition modes available These two modes are regular acquisition and scroll mode Regular acquisition occurs when in triggered mode with pre trigger time on screen i e some of the data occurs before the trigger point Triggered acquisitions are not displayed until all data is available similar to normal acquisitons to display As data is being sampled the advisory n s to initialized is displayed while pre trigger data is collected and n s to complete is displayed while post trigger data is collected This message indicates the time needed to complete acquisition where n is the remaining time in seconds s and continues to countdown until the time has elapsed The advisory running is displayed as the write cycle to the screen is executed and displayed data is updated At 5 sec div 50 seconds are needed for each acquisition The other acquisition mode in these ranges is scroll mode The scroll mode has two forms auto triggered scroll and triggered scroll e auto triggered scroll is used in auto trigger The oscilloscope acquires and displays data in the auto triggered scroll mode and displays each data sample as it is acquired As it samples and displays a message is shown at the top left corner of the display indicating this acquisition mode e triggered scroll when all information on the screen is after the trigger acquisition is n
56. ent standard delay mid threshold of the first edge of second parameter minus mid threshold of the first edge of the first parameter Note Negative delay is possible User defined delay second channel edge minus first channel edge l width The width algorithm has standard and user defined considerations if first edge is rising then width mid threshold crossing of first falling edge mid threshold crossing of first rising edge else width mid threshold crossing of second falling edge mid threshold crossing of first rising edge Algorithms HP 54502A A 4 Front Panel Reference User defined is the same as Standard definition except user defined threshold width The width algorithm has standard and user defined considerations if first edge is rising then width second rising edge first falling edge else width first rising edge first falling edge Period if first edge is rising then period second rising edge first rising edge Frequency frequency 1 period Duty Cycle duty cycle width period 100 Note width is always calculated using mid threshold Risetime risetime time at upper threshold time at lower threshold Falitime falltime time at lower threshold time at upper threshold Vmax Vmax voltage of the maximum point on screen Vmin Vmin voltage of the minimum point on screen Vp p Vp p Vmax Vmin HP 54502A Algorithms Front Panel Reference A 5
57. er the following conditions e at least one complete cycle must be displayed for period or frequency measurements e the entire pulse must be displayed for width measurements e the leading edge of the waveform must be displayed for risetime measurements e the trailing edge of the waveform must be displayed for falltime measurements E Ieee Making Measurements HP 54502A Front Panel Reference If more than one waveform edge or pulse is displayed the measurements are made on the first leftmost portion of the displayed waveform that can be used If there are not enough data points the oscilloscope will display lt with the measurement results This is to remind you that the results may not be as accurate as possible It is recommended that you re scale the displayed waveform and make your measurement again Algorithms A 1 Standard Measurements User defined Measurements When any of the standard measurements are requested the HP 54502A first determines the top base voltage levels at 100 0 From this information it can determine thresholds 10 90 and 50 needed to make the measurements The 10 and 90 thresholds are used in the risetime and falltime measurements The 50 midpoint is used for measuring frequency period pulse width and duty cycle The voltage thresholds are precise settings and sets specific locations on the waveform If the thresholds are not placed on the waveform above or below the HP 545
58. erence B 3 Horizontal Timebase Range 1 ns div to 5 s div Timebase Resolution 50 ps Delay Range post trigger 50 ms 5s 40 x s div 100 us 20 ms 1s 1 ns 50 us 10 000 x s div Delay Range pre trigger Realtime Repetitive Il Time div Settings Time div Setting Available Delay 40 x s div 2 us 5 s div40 x s div 10 ns 1ys div 80 us ins S5ns div 10000 x s div Trigger Trigger Pulse Width Real time Repetitive minimum Internal 7 0 ns 1 75 ns External 2 8 ns 2 8 ns Trigger Level Range Internal 1 5 x full scale from center of screen External 2 V Specifications and Characteristics HP 54502A B 4 Front Panel Reference Operating Characteristics Vertical HP 54502A Front Panel Reference Deflection Factors Channels 1 and 2 With single screen selected attenuation factors are adjustable from 2 mV div to 5 V div in a 1 2 5 sequence with the knob Finer adjustments can be made using direct keypad entry or the knob with the FINE key selected Probe Attenuation Factors Values from 0 9 to 1000 may be entered to scale the oscilloscope for external probes or attenuators attached to the channel inputs When probe tip calibration is done this value is calculated automatically Input Impedance 1 MQ or 500 selectable for CH1 CH2 and external Bandwidth Limit HF Reject Provides low pass filter with a 3 dB point at approximately 30 MHz for both triggering and signal display Can be selected
59. ers This product has been designed and tested according to International Safety Requirements To ensure safe operation and to keep the product safe the information cautions and warnings in this manual must be heeded Table of Contents LN a a ee he Se ete RS Bah chee hs Chapter 1 Introducing the HP 54502A 1 1 introduction i acces cca caaacaasaaacacsaaaaasasassassssa il Chapter 2 Instrument Setup 2 1 Introduction 2 1 Unpacking 2 1 Contents of Shipment 2 1 Initial Inspection 2 2 List of Accessories 2 2 Operating Environment 2 2 Storage and Shipping 2 3 Rear Panel Layout 2 3 Power Requirements 2 3 Applying Power 2 5 Installing the Power Cord 2 5 Selecting Line Voltage 2 6 Checking for the Correct Fuse 2 6 Line Switch 2 7 Intensity Control 2 7 Air Flow Requirements 2 7 Storage and Shipment 2 8 Connecting External Equipment ee Oe Chapter 3 Front Panel Overview 3 1 Introduction to the Front Panel 3 2 System Control 3 2 RUN STOP Key 3 3 SINGLE Key 3 3 CLEAR DISPLAY Key 3 3 LOCAL Key 3 3 HARDCOPY Key 3 4 Setup 3 5 AUTOSCALE Key 3 5 RECALL Key 3 6 SAVE Key 3 6 SHOW Key 3 7 Menus 3 8 Entry 3 8 Numeric Keypad 3 9 Knob 3 9 FINE Key 3 9 Input 3 10 Display 3 11 Instrument Reset nn Chapter 4 Timebase Menu 4 1 Introduction to the Timebase 4 1 Time Div Key 4 2 delay Key 4 2 reference Key 4 3 window Key 4 4 timebase Key 4 4 position Key 4 4 Window Exercise 4 4 Setting the
60. ertical sensitivity 400 mV div offset 200 00 mV de coupling input impedence IMQ Trigger Menu 6 11 e Channel 2 Vertical sensitivity 400 mV div offset 200 00 mV de coupling input impedence 500 e Display minimum persistence 2 screens axes e Trigger Channel i level 200 mV Channel 2 level 200 mV Set the trigger mode to pattern Set the pattern to HLX as follows e Press the function key until the first character is highlighted Turn the knob until the highlighted area is H e Select the next character in the pattern e Continue until all characters are selected in the HLX pattern Press the when key until entered is selected i PATTERN TRIGGER Ap running oy meere eeaeee eena mat trig d i ee Se state Gelay ty i om wh eri Ss a i eh a eae SE 50 000 ns 9 00000 s 50 000 ns 10 0 ns div m hoidoff a Sears sericea 54502W3G Figure 6 6 HLX when entered Pattern Trigger Menu HP 54502A 6 12 Front Panel Reference HP 54502A Front Panel Reference Channel 1 is displayed in the top screen To satisfy the conditions of the bit pattern channel 1 must be high higher than the channel 1 trigger level or greater than 200 mV When the signal on channel 1 goes higher than 200 mV and channel 2 is still low less than 200 mV the pattern conditions have been satisfied as the signal is entering the trigger conditions and the HP 54502A triggers e Press the when key and change the condition to when
61. exited The oscilloscope triggers on the first transition that makes the bit pattern false in this case when channel 2 goes high hp running ra when 50 000 ns O 00000 3 50 000 ns 10 0 nms div PATTERN TRIGGER edge state delay ty H Uo oon e rt hoidoff lime 4 502W3 1 Figure 6 7 HLX when exited Pattern e Change the bit pattern to HHX and select the entered condition Trigger Menu 6 13 To satisfy this bit condition both channels must be high The oscilloscope does not trigger until channel 2 goes high while channel 1 is high PATTERN TRIGGER stote cera tv j Fe ER en ae when 9 hp running 50 000 ns 0 00000 s 50 000 ns 10 0 ns div holdof f mm timeo esse 54502W32 Figure 6 9 HHX when entered Pattern e Change the trigger condition to when exited While channel 2 is still high when channel 1 goes low the bit pattern is no longer true and the HP 54502A triggers PATTERN TRIGGER z Kaaa a s state delay tv rm when bp tunaning 50 090 rs 0 00000 s 50 000 ns 10 0 ns div rm holdoft Ge coco 54502033 Figure 6 8 HHX when exited Pattern Trigger Menu HP 54502A 6 14 Front Panel Reference State Trigger The state trigger mode is similar to the pattern trigger mode except that Mode one channel is selected as a clock edge and the other two trigger sources define a pattern When the pattern becomes true the HP 54502A tr
62. ey qualify on edge Trigger Menu 6 20 The delay trigger mode qualifies on a signal edge pattern or state delay for a period of time or occurrence of edges and then triggers on a selected edge from any source This trigger mode is versatile and accommodates most complex triggering situations It has the flexibility to select different trigger sources delay times delay counts and then display various points of the waveform The qualify on key selects which mode to qualify the trigger before a delay is defined The qualify options are e edge e pattern e state Select the edge qualifier and the next two function keys defines the parameters The next key is an unlabelled field that selects the channel to be the source The second key below the edge selection is the slope selection HP 54502A Front Pane Reference qualify on pattern When the pattern trigger option is selected the next function key defines the qualifier pattern Defining a pattern is the same as in the pattern trigger mode e Highlight the bit to be changed by pressing the function key e Change the bit by rotating the knob After selecting through all four bits the active field is changed to the condition field This field to sets conditions as in the Pattern Trigger mode when entered when exited when present gt time when present lt time range gt time2 and lt time1 5a o These settings activate the next field as ap
63. ference Instrument Setup 2 a a aN i reel Introduction This chapter contains information for unpacking applying power and connecting optional accessories to the HP 54502A Inspection power requirements and instructions for running the HP 54502A self test for performance verification are also included in this chapter For safe and trouble free operation follow the instructions and advisories in this chapter Read the Safety Summary included in this manual nr Initial Inspection Contents of Shipment HP 54502A Front Panel Reference Inspect the shipping container for damage If the shipping container or cushioning material is damaged keep it until the contents of the shipment have been checked Check the shipment for compieteness and the instrument electrically and mechanically If the contents are incomplete there is mechanical damage or defect or if the instrument does not pass the selftest performance verification notify the nearest Hewlett Packard Office Keep the shipping materials for carrier s inspection The Hewlett Packard Office will arrange for repair or replacement at HP s option without waiting for claim settlement The following items are shipped with the HP 54502A Digitizing Oscilloscope Two HP 10430A Probes Probe to BNC Adapter 1250 1454 HP 545014 HP 54502A and HP 54503A Getting Started Guide HP 54502A Front Panel Reference HP 545024 Programming Reference HP 54502A Service Manual Feeling
64. for each vertical input individually LF Reject Provides high pass filter with a 3 dB point at approximately 450 Hz for triggering and vertical signal Can be selected for each vertical input individually AC Coupling Provides high pass filter with a 3 dB point at approximately 90 Hz for both triggering and signal display Can be selected for each vertical input individually ECL TTL Presets Vertical deflection factor coupling offset and trigger level can be preset independently on both channels for ECL and TTL levels Effective Resolution Vertical resolution refers to the oscilloscope s ability to resolve small incremental differences in voltage This characteristic is often assumed to be directly related to the number of bits in the instrument s analog to digital conversion system Specifications and Characteristics B 5 In fact the A D resolution is only one of several components of vertical performance Hewlett Packard single shot digitizing oscilloscopes are characterized for Effective Bits of resolution This method considers quantization error A D non linearities and system noise all of which affect the measurement accuracy of the instrument Typical performance Frequency 1 MHz 10MHz 40MHz 100MHz Eff Bits 6 0 Bits 6 0 Bits 5 9 Bits 5 4 Bits For more information about effective resolution please contact your Hewlett Packard sales office and ask for Product Note 5180A 2 Dynamic Performance Te
65. frame oxes grid connect dots i offon display record t norm extended hs i filier offon i 54502808 xsweep speeds faster than S500ns div 7 2 Realtime Acquisition Mode Display Menu Display Menu 7 2 HP 54502A Front Panel Reference Display Mode The DISPLAY mode key selects one of three display modes Key normal e averaged e envelope DISPLAY EST og enw persistence e 3 amp 3 norm The norm mode sets the time parameters for displaying data or n a ot persistence The range in the variable persistence mode is from minimum very fast overwriting and updating the display to infinite with variable f ofr rome settings in between from 200 ms to 10 seconds This means that data display records can be preset to any of the persistence settings Settings less than infinite display data for the specified period of time and then overwrite old data 54502W44 DISPLAY In realtime acquisition mode m persistente Egga int inite e Single or infinite persistence are the two choices during realtime pv of screens acquisition Single persistence is very fast overwrite As each new 2 acquisition is displayed it overwrites the previous data The current AR ee display is always the most recent acquisition sF t off frame Saxess In repetitive acquisition mode e Fast persistence settings are useful when the input signal is changing Sei rea and i
66. ftware or firmware will be uninterrupted or error free Limitation of Warranty The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation or maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED HEWLETT PACKARD SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Exclusive Remedies Assistance Certification Safety THE REMEDIES PROVIDED HEREIN ARE THE BU YER S SOLE AND EXCLUSIVE REMEDIES HEWLETT PACKARD SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY Product maintenance agreements and other customer assistance agreements are available for Hewlett Packard products For any assistance contact your nearest Hewlett Packard Sales and Service Office Hewlett Packard Company certifies that this product met its published specifications at the time of shipment from the factory Hewlett Packard further certifies that its calibration measurements are traceable to the United States National Bureau of Standards to the extent allowed by the Bureau s calibration facility and to the calibration facilities of other International Standards Organization memb
67. he time and voltage markers are placed on the waveform to show where the measurement was made if continuous measurements are off To clear measurements press Shift CLR MEAS For complete details of the measurement definitions and algorithms see Appendix A Algorithms Define Measure Menu HP 54502A 11 2 Front Panel Reference i meas meas This key is the primary sub menu selection key Press to select one of the def meas limit available sub menus This field is always the top selection so other submenus may be selected at any time Key meas Submenu The measure submenu is the default condition Continuous and statistics options are accessed from this submenu DEFINE MEAS meas meas meos fein gef iimit A aa ie e continuous T off 1 eee pe ELGLISE ECS oo Fol 54501 WF23 continuous Key If this option is turned on when a measurement selection is made the displayed measurement is updated periodically All subsequent measurements are continuously updated when selected When continuous is off the measurement is made once and the At A V markers are placed on that measurement showing where the measurement was made statistics Key The continuous function must be on before the statistics key is available When continuous is on statistics display the min value max value average value and current value on up to three measurements HP 54502A Define Measure Menu Front Panel Reference 11 3
68. iew HP 54502A 3 4 Front Panel Reference AUTOSCALE Key RECALL Key HP 54502A Front Panel Reference This key causes the oscilloscope to evaluate all input signals and set the correct conditions to display the signals When AUTOSCALE is pressed the following conditions are set Vertical sensitivity on all channels if applicable Vertical offset on ali channels if applicable Trigger edge mode positive slope and proper trigger level for the trigger source Sets to minimum perisitence when in normal display and repetitive acquisition modes Sweep speed of displayed channel In addition autoscale includes a soft reset e 0 6 o Displays one screen Turns At AV markers off Turns all measurements off Turns measurement limit test off Turns waveform math functions off Turns timebase window off Turns waveform pixel memory display off Turns filter off realtime acquisition mode Turns display record to normal Turns statistics off Turns connect the dots off Sets holdoff to 40 ns minimum value The previous oscilloscope settings are stored in volatile memory RECALL 0 To recall settings press RECALL 0 The RECALL key has three primary functions By pressing the RECALL key and then selecting 1 2 3 or 4 the HP 54502A executes a recall of a previously saved setup configuration The oscilloscope automatically saves the current configuration before executing an autoscale recall or setting up ECL
69. igger Holdoff is used to gain a stable trigger This technique is not necessary for most applications and waveforms however for many non recurring and irregular waveforms it is useful Instrument Setup Follow the instructions for setting up the signal generator The signal for this exercise is a burst pattern with two positive cycles that repeats every Sus Use an HP 8116A Pulse Function Generator with the burst option or a signal generator capable of the same signal Make the following settings MODE LBUR RPT 5 00 us BUR 2 FRQ 1 MHz DTY 50 AMP 1V OFS 200 mV Set the signal for a square wave S SSE S Trigger Menu HP 54502A 6 4 Front Panel Reference Oscilloscope Setup Connect the the signal generator to the channel 1 input and disconnect all other inputs e Press AUTOSCALE see Figure 6 2 hp running TI d 200 mv div offset 225 0 my 1 000 1 de A OOOO OOOO OOOO OOOO OOOO O O 5 00000 us 0 09000 us 5 00000 us 1 us div 2 225 0 mv 5450 WSS Figure 6 2 Two Burst Waveform after Autoscale e Select the TIMEBASE MENU e Set the sweep speed to 500 ns div e Set acquisition mode to repetitive The HP 54502A sets up the display parameters It is now attempting to trigger on the first rising edge of the two cycle burst e Enter the TRIGGER MENU and press the slope key The oscilloscope is now triggering on the first falling edge of the two cycle burst Press the slope key agai
70. iggers STATE TRIGGER on the next clock edge if the pattern meets setup and hold criteria i H trig d Let TRIG MENU SESEO i edge pattern i STATE TRIGGER Ecte gelay iv A te enh trig d auto i ra e B ciock 1 2 EXT i bo present Cear present rS is not holdoff o j sis d i iieis 54602513 time H i ET Figure 6 10 State Trigger Menu The trig d auto and trigger mode function keys remain displayed in all trigger modes clock Key Select any channel to be used as the state clock Select the channel by pressing the function key until the desired channel is highlighted The clock selection is reflected in the next field with an arrow pointing either up for a positive slope or down for a negative slope when Key The when key depicts the desired pattern The displayed pattern shows the arrow at the selected clock channel The other two trigger sources define the logic pattern that must be satisfied to generate a trigger event using the H L X convention described in the pattern trigger mode HP 54502A Trigger Menu Front Panel Reference 6 15 present Key holdoff Key To change the pattern e Press the function key until the bit to be changed is highlighted Rotate the knob until the desired setting is highlighted e Select the arrow to change the trigger slope if necessary and turn the knob until the desired settings appear A trigger event is generated on the s
71. ile memory one memory may be selected If multiple failures occur only the last failure data is saved because the most current data will overwrite the memory contents e Ifthe data is saved to pixel memory an accumulated save occurs No measurements may be made on the pixel data A save toa printer immediately sends the data to the peripheral device The save to key can be turned off and no save is effected after fail Key The test can be stopped when a failure occurs or can be continued Define Measure Menu HP 54502A 11 8 Front Panel Reference Introduction to the Utilities UTILITY HP TB menu selftest menu probe cal menu robe cal menu eg cal menu SS aA f Service menu i Me celicker cff on H i br oe TS pee BNC probe comp trigger out ae yrvrmavrmasnansssssssssnd rev date S4502W38 HP 54502A Front Panel Reference Utility Menu 12 The UTILITY menu accesses the calibration and service functions as well as sets up the HP IB interface The submenus include self test calibration service and a listing for the current firmware revision date This menu controls all of the service functions that maintain the reliable performance of the oscilloscope These submenus are part of the UTILITY menu e o oo eoe HP IB menu selftest menu probe cal menu self cal menu service menu UTILITY burr PIB menu i re pei Sse lf test menu eee RN NOR ee
72. ing a 1 meter coaxial cable Connect another 1 meter cable from the other side of the BNC tee to channel 2 The extra cable length between channels 1 and 2 provides a time delay between the signals displayed on the oscilloscope The propagation of a 1 meter coaxial cable is approximately 6 to 7 ns This time delay demonstrates the HP 54502A triggering capability e Press AUTOSCALE Set up the HP 54502A as follows Timebase 10 00 ns div delay 0 00 s reference cntr window off acquisition mode repetitive e Channel 1 turned on Vertical sensitivity 500 mV div offset 200 V dc coupling input impedence 1 MQ e Channel 2 turned on Vertical sensitivity 500 mV div offset 200 mV de coupling input impedence 500 Trigger Menu 6 17 e Display minimum persistence 2 screens e Trigger Channel 1 level 200 mV Channel 2 level 200 mV Set the trigger mode to state Setthe patternto L X as follows 1 Press the function key until the first bit is highlighted 2 Turn the knob until the highlighted area is 3 Select the next bit in the pattern and select L 4 Continue until all bits are selected in the LX pattern Press the when key until is present is selected see Figure 6 11 STATE TRISGER Ap running H i j t S veers pass i edge pattern arenes P pki T eters cercy tv if o ch ir setae when to SER N i Bo EES present ee ee ee t
73. ing or falling edge of any of the three inputs will generate the trigger The trigger occurrence value is selectable from 1 to 16 000 000 The maximum edge counting rate is 70 MHz Time delayed Mode The trigger can be qualified by an edge pattern or state The delay is selectable from 30 ns to 160 ms After the delay an occurrence of a rising or falling edge of any of the three inputs will generate the trigger The trigger occurrence value is selectable from 1 to 16 000 000 The maximum edge counting rate is 70 MHz 60 Hz 525 lines Source is selected to be any one of the three inputs Trigger level is adjustable for the selected source Polarity is selected for positive or negative synchronizing pulses A trigger occurs on the selected line and field of a 2 1 interlaced composite video signal Line Specifications and Characteristics B 7 numbering is 1 to 263 for field 1 and 1 to 262 for field 2 This TV trigger mode is compatible with broadcast standard M 50 Hz 625 lines Same as 60 Hz 525 lines except that line numbering Pia is 1 to 313 for field 1 and 314 to 625 for field 2 This TV trigger mode is compatible with broadcast standards B C D G H 1 K K1 L and N User defined mode Source is selected to be any one of the three inputs Trigger level is adjustable for the selected source The trigger is qualified with a high or low pulse that meets a select able time range The trigger is an occurrence of a rising
74. ired service If the original packaging material is no longer available identical packing material is available through local Hewlett Packard offices Mark the HP 54502A Front Panel Reference container FRAGILE to ensure careful handling In any correspondence refer to the instrument by the model and serial number Rear Panel The rear panel of the HP 54502A contains the power input voltage selector module power switch external connectors and calibrator protection switches as shown in figure 2 1 Power Requirements The HP 54502A requires a power source of either 115 or 230 Volts ac 25 to 15 single phase 48 to 66 Hz 200 Watts maximum power 3 Voltage Selector and nOn Switch Fuse Module Power Input DC Calibrator Output HP IB Connector Probe Compensation AC Calibrator Output Calibration Protect Switch Figure 2 1 HP 54502A Rear Panel HP 54502A instrument Setup Front Panel Reference 2 3 Selecting Line Voltage The fuse module is set at the factory to the line voltage used in the country of destination Check the setting of the fuse module to verify it is in the correct position for the voltage to be used If the setting needs to be changed use the following procedure CAUTION BEFORE APPLYING POWER TO THE INSTRUMENT BE SURE THE FUSE MODULE IS SET TO THE CORRECT LINE VOLTAGE POSITION Severe damage will occur if the line voltage is not properly set Change the fuse module position by pul
75. ively A store message is displayed above the waveform display area to show the storage locations of both values This key selects which memory to use The selections are nonvolatile memories m1 m2 m3 and m4 When a memory is turned on the small circle below the label is highlighted The waveform memories are record memories that store 2000 points of waveform information in each memory This key toggles the selected memory display on or off The source key selects the source waveform to be stored The source alternatives are any channel or either function This is the active key in the menu By pressing this key the specified waveform is stored in the specified memory When the key is pressed an immediate erase of the selected memory and a write to the memory is executed HP 54502A Front Panel Reference pixel Menu The pixel submenu selects the pixel memories These memories are useful when additive memory capabilities are needed Waveforms can be stored to and added to indefinitely WAVEFORM SAVE wm volatile in oe pv display ca clear memory nr i add to memory ae 54501 WE 19 volatile Key This is the memory select key The alternatives are pixel memory 1 or 2 The pixel memories are complete pixel saves of the waveform area excluding the graticule and markers in volatile memory The waveform display area is 256 X 451 pixels In pixel memory the entire screen is saved therefore data is m
76. ker i 54501 WF 64 start marker stop marker HP 54502A Front Panel Reference This function key toggles the time markers on and off With the At function turned on the next two fields are activated allowing individual control of the two markers The markers are placed on the display respective of the trigger point Positive time values are to the right of the trigger point and negative time values are to the Jeft Delta t values are determined by the following stop marker start marker delta t There is no such thing as negative delta t this only means that the start marker is placed later in time than the stop marker The inverse of delta t is 1 delta t Since the inverse of time is frequency this ratio produces an answer in frequency However if the markers are placed across parts of a waveform of differing time frames the answer may not be valid This feature is useful when looking for the frequency in a burst that is different from the rest of the waveform Place the time markers across the burst at similar points on the waveform to determine the frequency of the burst To set the start marker press the function key to highlight the field This makes the start marker field active Set the marker with the knob The start marker is represented with long dashes The stop marker is identical to the start marker except that it is represented by short dashes Delta t Delta V Menu 8 3
77. l 0 0 V slope positive holdoff 40 ns Display Menu Mode of avg persistence of screens off frame axes grid connect dots display record filter At AV Menu At markers AV markers Waveform Math Menu f1 off f2 off chan mem chan 1 operator chan mem chan 1 function sensitivity 1 00 V div function offset 0 0 Y Waveform Save Menu waveform pixel waveform nonvolatile mi display off source chan 1 Front Panel Overview HP 54502A 3 12 Front Panel Reference Timebase Menu 4 Introduction to This chapter contains a description of the TIMEBASE menu and how the the Timebase entire horizontal display and parameters are controlled with this menu TIMEBASE delay TIME 0 00000 s DEN H reference i badei deioy 1 if H i i i ONS iett fent right TIME BASE ro window e EA veearaee i reference l Ce ata a O a aa ei window iia O i repetitive steerer i left Innes i i recitime 54502W22 i t i i repetitive realtime i Figure 4 1 Timebase Menu pny timebase position 545028 t6 Time Div Key The time division function controls the sweep speed on the horizontal axis from 1 ns div to 5 sec div The main Timebase is incremented and decremented in a 1 2 5 sequence When the oscilloscope is in extended display mode the FINE key does not affect the timebase settings HP 54502A Timebase Front Panel Refer
78. l Reference This feature is useful when measuring for excessive overshoot or ringing By defining the measurements testing for pass fail criteria of any choice Test from the front panel or set the HP 54502A in the limit test and aliow the oscilloscope to report without supervision Note If the user defined upper and lower thresholds are placed too close together it is possible the HP 54502A will not be able to determine the mid point The message not found will be displayed in the measurement factors area Measurements define more parameters the horizontal test conditions for three specific front panel keypad measurements DEFINE MEAS e Delay m e width f standard gta When any of the three measurements are selected the measurement is thresholds made on the selected edge count slope and transition point The HP _Begsuremens 54502A starts counting edges from the left edge of the screen not at the reference point The selected edge must be displayed If the edge is not cases displayed the message not found is displayed in the measurement results area below the screen Oe ae T ee ey from edge Let o from edge 2at mid 450 1 WF 67 HP 54502A Define Measure Menu Front Panel Reference 11 5 Measurement delay not to be confused with timebase delay see Chapter 4 Timebase Menu is useful when measuring source to source delays or measuring time separation on the same sou
79. l time 400 MSa s Repetitive 25 MSa s Specifications and Characteristics HP 54502A B 2 Front Panel Reference Waveform Record Length Realtime Normal 501 points Realtime Extended 2001 points Repetitive Time div Sns 5s div 2ns div 1 ns div Record Length 501 pts 401 pts 201 pts Input C 7 pF nominal Input coupling ac de Offset Range Vertical Sensitivity Available Offset 2 mV 50 mV div 2 V gt 50 mV 250 mV div 10 V gt 250 mV 1 25 V div 50 V gt 1 25 V 5 V div 250 V Dynamic range 1 5 x full scale from center of screen Channel to channel Isolation with channels at equal sensitivity Realtime Repetitive 40 dB dc to 50 MHz 40 dB dc to 50 MHz 30 dB 50 to 100 MHz 30dB 50 to 400 MHz NOTES Specifications valid for temperature range 10 C from software calibration temperature with eitht or more averages selected 1 Vertical gain accuracy decreases 0 08 per C from software calibration temperature 2 Expansion is used below 7 mV div range so vertical resolution and accuracies are correspondingly reduced Below 7 mV div full scale is defined as 56 mV 3 With lt 8 averages vertical resolution becomes 1 6 of full scale 4 Available over HP IB waveform record length is Real time Normal 500 points Extended 2000 points Repetitive 10 ns 5 s div 1024 points 5 ns div 1000 points 2 ns div 400 points 1 ns div 200 points HP 54502A Specifications and Characteristics Front Panel Ref
80. lim LF rej IMO Bon DC more i S450Z81t0 Figure 5 1 HP 54502A Channel Menu HP 54502A Channel Menu Front Panel Reference 5 1 i a ia CHANNEL Key The top key in the first channel menu is for channel selection The key toggles channels 1 and 2 When a channel is selected highlighted in inverse video it can then be turned on When a channel is turned on the small circle immediately below the channel number is highlighted Note It is possible to have a channel turned on and view while being in the vertical control menu of another channel When making changes ensure you have the proper channel and function selected and you are changing the channel you intend to change nnn Vertical The vertical sensitivity key is the third key from the top in the channel Sensitivity Key menu The field itself is not labeled however the current volts division is displayed with the units of the current selection When this function is selected either of the entry devices can be used for data entry The range of the vertical sensitivity for the HP 54502A is from 2 mV division to 5 V division Vertical sensitivity changes in a 1 2 5 sequence in the normal mode or can be changed in the fine mode n offset Key When offset is selected 0 volts is on the vertical midpoint of the display Offset is the voltage level at mid screen Offset moves the displayed signal up or down similar to the vertical position adjustment on an analog
81. ling the fuse module out and reinserting it with the appropriate arrows aligned e Carefully pry at the top center of the module as shown in figure 2 2 until it can be grasped and pulled out Figure 2 2 Selecting Line Voltage Instrument Setup HP 54502A 2 4 Front Panel Reference Verifying the Fuse If it is necessary to check or change fuses remove the fuse module and look at each fuse for its amperage and voltage ratings Power Cord 3 A FUSE 3 8 A FUSE Figure 2 3 Checking for the Correct Fuse The HP 54502A is a Safety Class 1 instrument with an exposed chassis that is directly connected to earth via the power supply cord to meet IEC Standard 348 This instrument is provided with a three wire power cable oe L TNE Ge ce ee Z00W Mat 48 08 Hz oni nn Ties anna oe SSI i fi i nn ONN i Ri i Move aee NC Ta h 5 N me g 2 Figure 2 4 Line Switch When connected to an appropriate AC power outlet this cable grounds the instrument cabinet The type of power cable plug shipped depends on the country of destination See next page for available power cords HP 54502A instrument Setup Front Panel Reference 2 5 8120 1351 8120 1763 8120 13969 81200656 B1ZO 1669 B12Z0 1692 8120 2857 B120 t376 etp 1521 8120 1892 81200898 8120 1396 8120 2956 8120 29 7 22N OPT 917 BIRO 42 44 1204600 3 81204753 81204764
82. ly except for the HP IB digitize command for which averaging terminates at the specified number of averages Envelope Provides a display of the running maximum and minimum voltage levels at each horizontal time position Graticules The user may choose full grid axes frame or no graticule Connect the dots Provides a continuous display connecting the sample points with straight lines Connect the dots is operative for modes in which a single valued waveform can be connected including average envelope single and minimum persistence modes Connect the dots is not available in scroll mode or in real time infinte persistence mode Scroll Mode The 54502A automatically selects scroll mode at time per division settings from 200 ms div to 5 s div if the scope is in Auto triggered mode or if the scope is in Triggered mode and has no pre trigger data displayed i e no negative time on screen Scroll mode updates each data point on the displayed waveform as the data is acquired Time Base In Repetitive Mode Minimum Persistence One waveform data value is displayed in each horizontal time position of the display The waveform is updated as new data is acquired for a particular horizontal time position Variable Persistence The time that each data point is retained on the display can be varied from 200 ms to 10 seconds or the points can be displayed indefinitley Time Base in Real time Mode Single Persistence One waveform da
83. m e Press the display key to turn on the m3 display Press the CHAN menu key change the offset of channel 1 This moves the current display so the stored waveform can be viewed The display should look like the following figure WAVEFORM SAVE hp running eee Bile j JFT po nonvolati her sms mI me ra ns i m OVSp oye off Lae ee 3 H po SOUL CE me chon 2 func 1 2 j eer ert CANE ASE L T a E SE E E E EE E pipdeerbcisdsatratereia store i pe pe aac E Dinti A EA 5450 1w43 250 000 us 0 00000 s 250 000 us 50 0 us div Figure 10 2 Displayed Memory HP 54502A Waveform Save Menu Front panel Reference 10 5 Define Measure Menu 11 Introduction to This chapter contains a description of the measurement menu The Measurements entire measurement function with all possibile options is accessed with the DEFINE MEAS menu DEF INE MEAS megs meas megs def limit test t fon i f risetime H H fotl ti f 1 set ime pets i meas a H period i wei dth I fmm GEL OED width duty cycle CEEA delay p or if V pep Lote Vo mir i 1 V max save to V rm mi 4 p1 p27 V amp i printer ptotter V bese top l efler fait A i stop continue i A A user defined thresholds medsurements stendard
84. mmediate feedback is needed extended e More persistence is useful when observing long term changes in the pase signal or low signal repetition rates on i 54502W09 i HP 54502A Display Menu Front Panel Reference 7 3 DISPLAY norm avo env at avg anmann manmanan m of sereens m 2 noe off p axes grid cn connect dots Ee dispiay recordi icra extended filter off 54502W10 Display Menu 7 4 avg In repetitive acquisition mode At minimum persistence a point is erased when a new point is acquired in the same time on the display Therefore the waveform fills quickly and each point remains for a minimum amount of time NOTE When the keypad is used to change persitence settings any entry longer than 10 seconds causes the message value out of range set to limit to be displayed Persistence is automatically set to infinite Any entry less than 100 ms causes the same message to be displayed and persistence is set to minimum In both acquisition modes e Infinite persistence can be used for worst case characterizations of signal noise jitter drift etc In this mode the HP 54502A is used as a storage oscilloscope When norm is selected the function key beneath the norm field is activated This field displays the current persistence setting that can be set using either of the entry devices Connect the dots is available only in norm mode and minimum pe
85. mples data continuously and reconstructs a waveform after many data points have been attained this mode is useful when viewing a continuous waveform Timebase 4 5 realtime mode In the repetitive mode e The HP 54502A displays data collected from multiple acquisitions from either or both channel inputs e Data from multiple acquisitions can be averaged to generate a display the avg key is activated when in the repetitive avg mode e Data from each acquisition can be displayed for a definable period of time persistence e Waveform records are established at 501 data points on the 5 ns 5s div ranges 401 data points on the 2 ns div range and 201 data points on the 1 ns div range When in realtime mode the HP 5502A displays data collected during successive single shot acquisitions from either or both input channels The HP 54502A can make a single shot capture simultaneously on both channels Each single shot acquisition record is 2001 data points When viewing a 10 division display 501 data points are displayed The HP 54502A can be set for viewing the entire 2001 data points with the extended display record function See chapter 7 Display Menu display record key ee Window Exercise Setting the Input Signal Timebase 4 6 For demonstration on how the window is useful in making measurements and viewing the windowed waveform perform the following exercise For this exercise use a simulated ECL input signal a
86. n HP IB cable to the oscilloscope and any HP IB compatible device Tighten the HP IB cable with the captive screws of the cable to eliminate the potential of an inadvertant disconnection 2g mq Ct tied Tenement ae 54508 EXA Figure 2 7 Connecting External Equipment The HP 54502A must be properly addressed to communicate with the connected device The HP 54502A HP IB address is set in the HP IB submenu See Chapter 12 for detailed information about the HP IB submenu HP 54502A Front Panel Reference Front Panel Overview 3 a a a Introduction to This chapter describes the functional sections of the HP 54502A front the Front Panel panel The explanation of each area also contains their interaction with each other and provide a basis for applications and usages The front panel is separated into six functional areas Function Keys S4502 01 Entry Devices Input Figure 3 1 HP 545024 Front Panel HP 54502A Front Panel Overview Front Panel Reference 3 1 EE 2ChC OII System Control The SYSTEM CONTROL keys are located along the top of the oscilloscope to the right of the display This section controls the following functions e Dynamic display features e Selecting local control Activating hardcopy Selection of any key in the SYSTEM CONTROL section causes the oscilloscope to execute that command immediately Figure 3 2 System C
87. n to trigger on the positive edge HP 54502A Trigger Menu Front Panei Reference 6 5 Trigger Menu 6 6 Note The signal generator is set for two 500 ns pulses The display on the oscilloscope appears to have three pulses This is an unstable trigger condition The following steps expiain this condition and how to overcome it TIMEBASE S00 ns divdg aa ec Q 00000 S relerence rett Ent ont m Window m DN ert tit pment hp running 1 Ta aa L E aaa TS SE EE m i e E0000 us 0 00000 2 50000 us ee ees 500 ns div t l recitime 54502W28 6 3 Two burst Pulse Determining holdoff time Change the time div setting to 2 x s div Press RUN STOP STOP CLEAR DISPLAY and SINGLE This shows the period of the waveform Sunce the oscilloscope 1s recognizing two valid trigger events edges in this case of the burst the holdoff time needs to be set such that it ignores the second puise in the burst Using A t markers the second edge can be found to be about 1 us from the first edge See Chapter 8 Delta t Delta V Menu Press the holdoff key Set holdoff to 1 04000 us with keypad or knob HP 54502A Front Panel Reference EDGE TRIGGER SESS hp running 2 50000 us 0 00000 s 2 80000 noise reject 506 ns div S4502W29 Figure 6 4 Two Burst Pulse w Stable Trigger The input signal to the oscilloscope has two 500 ns pulses On the firs
88. ng factors for the display not sensitivity at the input Probe attenuation is calibrated in the Utility menu See chapter 12 for information on probe calibraation Attenuation factors are saved with the front panel setup Channel Menu HP 54502A 5 4 Front Panel Reference i cel ECL Key The ECL key sets the oscilloscope to levels optimized for ECL circuits V Div 200 mV div offset 1 3 V coupling de Trigger level 1 3 V Trigger slope no change 8 RECALL 0 returns the menu to the previous settings a ail TTL Key The TTL key sets the oscilloscope to levels optimized for TTL circuits V Div 1 V div offset 2 5 V coupling de Trigger level 1 4 V Trigger slope no change ee o e To return to the previous settings press RECALL 0 HP 54502A Channel Menu Front Panel Reference 5 5 Trigger Menu 6 Introduction to The trigger modes of the HP 54502A provide many distinctive techniques the Trigge rs to trigger and capture data The triggering capabilities range from simple edge triggering to logic triggering on multiple signals This chapter contains descriptions of the triggering modes and explanations on how to use them and exercises detailing some real life applications The HP 54502A has five triggering modes e Edge e Pattern State e Delay e TV Br ee ee Trigger Mode The trigger level threshold for each channel is set in the e
89. ntly Waveform Save Four non volatile waveform memories and two volatile pixel memories are provided Waveform memories store single valued waveforms such as an averaged waveform If an envelope waveform is stored to a waveform memory it will automatically be stored with the upper waveform in one waveform memory and the lower waveform in another Pixel memories store an entire screen of waveform data They are very useful for storing multiple overlapping waveforms and infinite persistence waveforms Automatic measurements may be performed on the four non volatile waveform memories but not on the volatile pixel memories Automatic Pulse Parameter Measurements The HP 54502A offers 16 automatic pulse parameter measurements from the front panel shown below and additional measurements via HP IB including All Overshoot and Preshoot The standard measurements are performed with 10 50 and 90 voltage thresholds as defined by IEEE standard 194 1977 IEEE Standard Pulse Terms and Definitions Specifications and Characteristics HP 54502A B 10 Front Paneil Reference User definable Measurement Threshoids Setup Aids HP 54502A Froni Panel Reference Automatic measurements available on the HP 54502A Risetime Pulse Width Volts amp Volts avg Preshoot Failtime Pulse width Volts base Volts max HP IB only Frequency Duty Cycle Volts top Volts min Overshoot Period Delay Volts p p Volts RMS HP IB oniy The HP 54502A allows you to se
90. number of patrn patterns from 2 to 16 000 000 a Pattern Trigger Exercise Trigger Menu 6 10 This exercise demonstrates how to define the 3 bit pattern and how it affects the trigger and the resulting display Note Set the trigger level for each trigger source while in the edge mode These trigger levels must be set before you go to the pattern mode or proper triggering may not occur HP 54502A Front Panel Reference Instrument Setup Oscilloscope Setup HP 54502A Front Panel Reference To perform the following exercise use the HP 8116A Pulse Function Generator or another function generator capable of producing the same 1 MHz 1 volt square wave signal Set up the HP 8116A Pulse Function Generator e Mode NORM e FRQ 1 00 MHz DTY 50 e AMP LO0V e OFS 200 mV e Pulse square wave Connect the signal to a BNC tee on channel 1 using a 1 meter coaxial cable Connect another 1 meter cable from the other side of the BNC tee and terminate in 50 Q to channel 2 The extra cable length between channels 1 and 2 provides a time delay between the signals displayed on the oscilloscope The propagation of a 1 meter coaxial cable is approximately 6 to 7 ns This time delay is used to demonstrate the HP 54502A triggering capability e Press AUTOSCALE Set up the HP 54502A as follows e Timebase 10 00 ns div delay 0 00 s reference cntr window off acquisition mode repetitive e Channel 1 V
91. ob Note Pay close attention to the movement of the highlighted window it moves to various options within the field The source key chooses between the NTSC standard tv signal used in the United States with a 60 Hz and 525 lines per frame the standard of 50 Hz and 625 lines per frame used in most countries in Europe The third option is for user defined ranges of the tv signal To make the desired selection e Press the selection key and select the standard by rotating the knob The active field is highlighted in inverse video Source Select Key To select the trigger channel to be used as a source HP 54502A Front Panel Reference e Press the selection key and move the highlighted field rotate the knob until the desired channel is displayed Trigger Menu 6 27 level polarity Key field Key line Key holdoff Key Trigger Menu 6 28 The level option sets the trigger level that is applicable only to the tv trigger source e Press the function key again and the highlighted window moves to the polarity option and selects the rising edge or falling sync pulses to trigger on The field key selects field 1 or 2 The line key selects which line the trigger will be generated on This selection is dependent upon which field has been selected previously If the previous selection is the 60 Hz 525 lines standard the options available depend upon which field 1 or 2 is selected e if field 11s selected select from
92. ons are required for building specic enclosures contect your HP field engineer Z Dimension are in mifiimetres and inches See ey 17 2 e pett 362 5 094 3 is 422 3 16 62 aan 44 8 S4501E 13 i H i 425 4 16 750 meni Specifications and Characteristics HP 54502A B 14 Front Panel Reference
93. ontrol Section RUN STOP Key The RUN STOP key toggles the acquisition status of the HP 54502A If the oscilloscope is currently running current status is displayed in the top left corner of the display in the message field the instrument is placed in the stopped mode In this mode normal acquisition is stopped and the last acquired data is displayed If the oscilloscope is stopped it is immediately changed to another mode i e running awaiting trigger auto trigger etc Front Panel Overview HP 54502A 3 2 Front Panel Reference SINGLE Key CLEAR DISPLAY Key LOCAL Key HARDCOPY Key HP 54502A Front Panel Reference The SINGLE key activates the acquistion system for one trigger event One acquisiton is made displayed and then the data acquisition and display cycle is stopped This single acquistion is superimposed on the current displayed data If the display has been cleared before the SINGLE key is pressed only one acquisition is displayed The CLEAR DISPLAY key clears the display and resets all associated measurements If the oscilloscope is in the stopped mode all data that is currently displayed is be erased If the oscilloscope is running all data is erased however new data is displayed on the next acquisition The RUN STOP and SINGLE keys are not affected The RUN STOP SINGLE and CLEAR DISPLAY keys have a relationship that make it possible to manipulate data acquisitions and view one two or several acquisitions
94. ormation regarding memory and save data is Or E lt g 7 000 ns displayed G L pe Y a a Q e0 kareena save to al mi m2 hs m Note Pt pe printer a Bute m after sove continue q At least one measurement and up to three measurements must 34501 WF 24 be selected from the keypad The limit test will be run on front panel measurements test Key This key toggles the test test routine on or off When the test is turned on the oscilloscope starts running in the test mode on the most current measurements that have been selected HP 54502A Define Measure Menu Front Panel Reference 11 7 set Key This key selects the measurement There are sixteen measurements available the same ones as are available on the numeric keypad e Press the function key to highlight the field and rotate the knob to select the desired measurement NOTE This key does not select the measurements on which the limit test operates that selection is made from the keypad with the blue Shift key fail if gt Key This feld sets the upper failure threshold The range on this field is dependent upon the units of the desired measurement orif lt Key This key sets the lower threshold of the failure parameters save to Key Key saves the data associated with the failure to memories or to a hardcopy device The source of the save is selected in the WAVEFORM SAVE menu e Inthe case of saving to nonvolat
95. oscilloscope However offset on the HP 54502A has a range of 16 divisions from center screen Channel Menu HP 54502A 5 2 Front Panel Reference a aaa aaa Cou pling Key The coupling key has several selection variables dc dc BW lim ac ac BW lim ac LF reject e e oo When dc is selected 1M Q and 50 Q DC input impedances are available as choices for input impedance Bandwidth limit is switchable with the different combinations of the coupling function Bandwidth limit reduces the effective dc bandwidth to 30 MHz Ac coupling provides a high pass filter rejecting frequencies below 90 Hz The LF reject provides a high pass filter rejecting frequencies below 450 Hz Bandwidth limits and LF reject filters reduce the noise in the vertical path as well as the trigger path ee Input Input impedance is 1 M 2 for ac coupling and selectable 1 M Q or 50 Q Imped ance dc when dc coupling is selected in the coupling function HP 54502A Channel Menu Front Panel Reference 5 3 more Key The more key toggles between the two levels of the channel menu CHANNEL MORE Fy A ExT more S4502W26 probe key The probe key selects probe attenuation with a range of 1000 1 to 9000 1 Attenuation is adjusted by either knob or entry keypad When the knob is in coarse mode adjustments are incremented or decremented in the 1 2 5 sequence When in fine mode adjustments are in 0 1 increments Probe attenuation affects scali
96. ot started until after the trigger occurs The oscilloscope then displays the data as in auto triggered scroll putting each new point on the screen as it is acquired In this way a stable triggered waveform is displayed as it is acquired In these scroll modes a scroll indicator small dot moves across the top of the waveform display area to show where new samples are being plotted Any key entry during the scroll mode interrupts the acquisition and causes errors in the displayed waveform HP 54502A Front Panel Reference a ee d elay Key Selecting delay assigns delay as the active function When delay is set to 0 the trigger event occurs at the delay reference point Positive delay indicates time after trigger and negative delay indicates time before trigger Therefore a delay setting of 50 ns indicates that the trigger event occurs 50 ns after the delay reference point reference trigger event delay a aeee reference Key The reference key changes the delay reference point to one of three reference points e left cntr center e right If delay is set to 0 the reference point consists of pre trigger data to the left and post trigger data to the right NOTE The time from trigger changes with the delay setting and is displayed at the bottom of the waveform area at the left center and right of the display HP 54502A Timebase Front Panel Reference 4 3 window Key TIMEBASE Se ea pu 0 00000 os
97. points for better viewing When the window function is enabled two selections are available for placing and sizing the window e Window timebase e Window position HP 54502A Front Panel Reference timebase Key position Key This key is activated only when the window function is turned on and sets the tumebase in the window As the window timebase is increased the time in the window displayed in the bottom screen is increased The markers in the top screen move farther apart When the window reaches full screen the main timebase and the window timebase become equal As the window timebase is decreased the markers move closer together This key is activated only when the window function is turned on The window can be placed anywhere on the normal waveform By adjusting the window position you can see any part of the waveform Note When window timebase time division there is only one possible setting for window position Turning the knob will have no effect a ee repetitive realtime key repetitive mode HP 54502A Front Panel Reference The bottom function key selects one of the two acquisition modes used by the HP 54502A repetitive acquisition e realtime acquisition See Chapter 7 Display Menu for more on acquisition modes The repetitive mode sets the HP 54502A to acquire data in the random repetitive mode see Feeling Comfortable With Digitizing Oscilloscopes In this mode the oscilloscope sa
98. propriate so the specific time parameters can be set qualify on state Ifthe state trigger option is selected the next two function keys define the state conditions As in the state trigger mode select the channel to define the state clock This selection is reflected in the pattern with an arrow and the slope is depicted with the arrowhead pointing up or down Use the function key to move the highlighted bit to change the pattern When the pattern is set the is not present setting can be changed by moving the highlight to the is not present field label and pressing the function key again When the label is highlighted toggle the setting between is not present with the knob HP 54502A Trigger Menu Front Panel Reference 6 21 delay Key DELAY TRIGGER edge _potiern stoteffceiay ty f E n pattern siste Ey EXT f delay 50 00 ns trigger on count p l of EA 54502W14 d i co DELAY TRIGGER ay 1 edge pattern stote se roy tv ouolify on ace Esq patiern state p on f of trigger on count of f of 4 54502W55 TENE i Trigger Menu 6 22 This field selects between two delay options To change between the time and count options rotate the knob until the desired option is displayed in the inverse video fieid delay time disables the trigger circuit for a selected period of time from 30 ns to 160 ms after the trigger has been qu
99. r using the knob to set the number 1 to 16 000 000 e Press the function key again and move the highlighted field to select the slope The knob toggles the selection between rising and falling edge e Press the function key again and highlight the channel selection The knob is used to change the channel selection eee Delay Tri er This exercise demonstrates how to use the delay trigger to trigger on the y trigg gg Exercise exact point of a waveform The exercise leads through setting up a complex signal setting up the HP 54502A and changing settings and counts for viewing various points on the waveform instrument Setup Set up an HP 8116A or comparable signal generator for a burst pulse with ten bursts that repeats every 50 useconds Set up the HP 8116A Pulse Function Generator e Mode LBUR e RPT 50 us e BUR 10 e FRO 5 0 MHz e DTY 50 e AMP 1 00V e OFS 200mV Connect the signal to channel 1 of the HP 54502A HP 54502A Trigger Menu Front Panel Reference 6 23 Oscilloscope Setup Trigger Menu 6 24 The HP 54502A autoscales and displays this signal however for this example make the listed triggering changes after autoscaling e Press AUTOSCALE Ap running aia Dx 200 mV div offset 225 0 mv 1 000 1 500 de i i E hi t 5 00000 s 10 0000 us 2 00 us div 10 0000 us S4502W4 1 7 65 00 mV Figure 6 13 Ten Burst Pulse after AUTOSCALE Set up the HP 54502A as follows
100. rce or a different source The front panel delay measurement can be redefined by edge slope edge count from 1 to 100 and what part of the transition edge upper lower mid is used as a reference point e When setting edge count fields it is handy to press the fine key In the course mode the HP 54502A increments decrements by tens 1 11 21 100 In the fine mode the increment decrement sequence is in 1 s When the delay measurement is selected from the front panel the source c f m and the source number must also be selected width allows choice of only the point on the waveform transition upper lower mid to measure when making the positive width of a displayed waveform width allows the choice of only the point on the waveform transition upper lower mid to measure when making the negative width of a displayed waveform Define Measure Menu HP 54502A 11 6 Front Panel Reference Measure Limit The HP 54502A can run limit tests on on up to three measurements The Sub menu menu presets certain conditions and stores any failure data for evaluation at a later time Set the limit test while in this menu and select the measurement from the front panel DEFINE MEAS Peretti i meos meas meas sae def iimit When a test is running statistical data is displayed describing the test current measurement minimum value maximum value fail it gt average value 50 0000 s Failure data as well as inf
101. rizontal display to 50 0 ns div see Figure 9 5 This display is best viewed when the oscilloscope is in repetitive acquisition mode WAVEFORM MATH Ap 7 i n Ca oe ee Q o i 4 m display TADEN ERAON ana reatend tortie 3 off Es t f i a i F 4 x 4 f cnon kd 2 Timne 4 2 3 4 E x v invert chan T a J mem 1 2 3 4 f eensitiviiy 250 000 ns 0 00000 E EN MRE cc ee 50 ons diyv 54502008 Figure 9 5 Channel 1 minus Channel 2 HP 54502A Waveform Math Menu Front panel Reference 9 7 Waveform Save Menu 10 a ENN SR eR EET TT ETE NY ON RSG IVP eA SY REPO introduction to This chapter describes how to select the waveform and pixel memories on the Memories the HP 54502A The menu consists of two submenus waveform memories m1 m4 used to store one waveform at a time pixel memories pl and p2 used as a screen store In this manner the memories are used as a storage oscilloscope WAVEFORM SAVE Waveform inonvoliatile volatile mi m2 m3 m4 i p p cba Sa cena i p drasi isptay i isplay eae pecmsceuaasaal offon j oft on berea l baa eee oe teeta tne i ae aa source te clear bmn chan 1 2 memor y func 172 j peee fil add to j memor Store 4 E 54502807 Figure 10 1 Waveform Save Menu waveform pixel This is the function key used to chose the desired type of memory Th
102. ront Panel Reference EO Key form feed Key paper length Key device mode Key exit menu Key HP 54502A Front Panel Reference The EOI End or Identify key toggles this function on or off EOI is a line on the HP IB asserted with the last data byte of a message If this function is on EOI is asserted by the HP 54502A on the last byte of each message sent If it is off EOI is not asserted This function only affects messages sent from the HP 54502A The HP IB accepts any of the legal IEEE 488 2 message terminators regardless of the setting of this function Note IEEE 488 2 requires that EOI is asserted Therefore with EOI off the HP 54502A will send messages that do not follow IEEE 488 2 rules concerning EOI EOI should only be turned off if the controller does not deal with EOI appropriately If the form feed option is on the printer performs a form feed at the end of the hardcopy If form feed is off the page is scrolled up four lines when the hardcopy is complete Select between 11 inch or 12 inch pagelengths for auto form feed This is used to set the 11 inch page the U S standard or the 12 inch page U K and European standard This key selects whether the hardcopy goes to a printer or plotter The HP 54502A has been designed to send hardcopy to HP printers and plotters with HP IB options The following printers have been successfully tested with the HP 54502A HP 2225A HP IB ThinkJet HP 2227B QuietJet an
103. rs any selections made for the active field The knob changes values within each function It increments decrements or toggles the selection in the active field or function The current selection is displayed in fullbright in the displayed menu area and can be changed with the knob The FINE key changes the increment and decrement sequence Instead of sequencing in the normal sequence the values increment decrement in more precise values Use this feature when the normal sequence is too coarse for precision measurements or settings When the HP 54502A is operating in the fine mode the word fine is displayed in the lower right corner of the CRT i T Input HP 54502A Front Panel Reference The input section consists of connectors for signal input Channel inputs 1 and 2 select 1 MQ or 50 0 input impedances and each is shunted by approximately 7 pF at the input BNC with a maximum input voltage of 250 V Front Panel Overview 3 9 Display The display section contains the screen and function keys The vertical column on the right side of the screen is the function display The functions that are displayed at any one time will correspond toa softkey The softkeys select any function or field that is displayed in half bright FUNCTION KEYS aed C pOo0o a i Lot O CI Tho eiee OC a H5 m aa fe wa 1 poo o 2990 ea a o Z OG a 0O g O E 7 E i H L ae 54502605 Fig
104. rsistence The averaged mode selects the number of waveform acquistions that are averaged to generate the displayed waveform The range for the averaging function is 1 to 2048 in powers of 2 When averaged mode is selected the next function key is activated and the number of averages is set using either entry keys or knob Displayed signal noise is significantly reduced by using the averaging mode As the number of averages is increased from 1 to 2048 the display becomes less responsive to changes in the input signal s however using more averages reduces the effects of displayed signal noise and improves resolution HP 54502A Front Panel Reference env The envelope mode needs no other parameters set The display reflects the minimum and maximum voltages in each horizontal position This is useful in viewing voltage or time jitter of screens The next function key selects the number of screens to be displayed Key DISPLAY a e 1 the entire display area is one screen and any displayed waveforms ney ae are superimposed on top of each other e 2 the display area is divided into two screens Channel 1 is displayed in the top screen and channel 2 is displayed in the bottom screen See of sereens gt Figure 7 2 hp off eS axes grid j connect dots i Channel 1 Viewing Area rrdisploay recor i FES e tenaca filter off Ea Channel 2 Viewing Area 54502W1 1 oem 54501 WF 52 Figur
105. ship The HP 54502A has a three year warranty HP s board exchange program assures economical and timely repair of units reducing cost of ownership Solutions HP s System Engineering Organization can help you configure an HP IB system and provide software support for your application developing solutions to meet your measurement needs Contact your Hewlett Packard sales and service office for more information i a General Characteristics Environmental Temperature Conditions Operating 0 C to 55 C HP 54502A Front Panel Reference Non operating 40 C to 70 C Humidity Operating up to 95 relative humidity non condensing at 40 C Non operating up to 90 relative humidity at 65 C Altitude Operating up to 4600 meters 15 000 ft Non operating up to 15 300 meters 50 000 ft Vibration Operating Random vibration 5 500 Hz 10 minute per axis 0 3 Gmns Non operating Random vibration 5 500 Hz 10 minute per axis 2 41 Grms Resonant search 5 to 500 Hz swept sine 1 Octave minute sweep rate 0 75G 5 minute resonant dwell 4 resonances per axis Specifications and Characteristics B 13 Power Requirements Weight Dimensions Voltage 115 230 V ac 25 to 15 48 66 Hz Power 350 VA maximum Net approximately 10 kg 22 Ib Shipping approximately 20 kg 44 lb Refer to outline drawings below NOTES t Dimensions ore for generot informetion oniy if dimensi
106. sinfabetetpatbratectress sensitivity mmm he K as Sy pr offset Lo READE SEO 54 502W35 Function Key display Key Waveform Math Menu 9 2 The Waveform Math menu selects and presets any of various operations sources and displayed results This key selects either function 1 or function 2 The display key turns the selected function on or off The vertical sensitivity and offset are displayed in the function menu fields HP 54502A Front Panel Reference chan mem Key Operator Key HP 54502A Front panel Reference When the function display is turned on the screen splits and the original waveforms are displayed in the top half screen while the functions are displayed in the bottom half screen Both functions can be on at the same time and they are displayed superimposed or in two screens in the bottom half of the CRT if multiple screens have been selected The timebase window automatically turns off when a function is turned on Press this key to select the first operand of the mathematical operation or the waveform to be manipulated The choice can be any displayed channel or any waveform memory that has a waveform stored Ensure that the channel or memory source is turned on If the operator is only or invert this is the only operand that may be selected This key selects any of the six functions Continue pressing the selection key until the operation desired is highlighted plus
107. speed ATE to device characterization in research and developement environments The HP 54502A also features powerful triggering easy waveform storage automatic measurements and instant hardcopy output The HP 54502A features an easy to use human interface yet has many sophisticated capabilities and multiple triggering functions Waveforms are easily stored for future reference waveform measurements are automatic and instant hardcopy is available when the HP 54502A is teamed with an HP IB compatibie printer or plotter Some of the key features of the HP 54502A are listed here See Appendix B for a complete listing of specifications and characteristics e Repetitive Bandwidth dc to 400 MHz e Single Shot Realtime Bandwidth de to 100 MHz Sample Rate 400 MSa s e Two channel input and display External Selectable Trigger e Maximum Vertical Sensitivity 2 mV division e Minimum Vertical Sensitivity 5 V division e Autoscale for automatic setup e Automatic measurements with User Defined and Statistics e Hardcopy output e Measurement Limit test HP 54502A Introduction Froni Panel Reference 1 1 Introduction 1 2 e e e8 280686 6 Waveform Math x vs invert only Four nonvolatile set up memories Four nonvolatile waveform memories Two volatile pixel memories Dual Timebase Windowing Advanced Logic Triggering TV Triggering Pre and Post trigger viewing capability ECL TTL Presets HP 54502A Front Panel Re
108. sting of A to D Converters pub 02 5952 7629 Horizontal Dual Timebase Windowing Allows user to zoom in on portions of the waveform using time markers that are displayed on the top half of the screen An expanded time base is displayed on the lower half of the screen The window time base can be set to provide as much as a 20 1 expansion ratio Waveform measurements are performed only on the the dual time base window information when windowing is turned on Delay Between Channels Difference in delay between channels can be nulied out to compensate for differences in input cables or probe length Use time null cal found in the Probe Cal menu see UTIL Key Reference Location The reference point can be located at the left edge center or right edge of the display The reference point is defined as the trigger point plus the delay time Trigger Modes Edge Trigger Positive or negative edge can be selected for trigger on channels 1 and 2 or on the external trigger input Pattern Trigger A pattern can be specified using channels 1 2 and the external trigger input Each of the inputs can be specified as a high low or don t care with respect to the level setting in the edge trigger menu Trigger can be selected to occur on the last edge to enter the specified pattern or the first edge to exit the specified pattern Specifications and Characteristics HP 54502A B 6 Front Panel Reference Delayed Trigger TV
109. successful the displayed message 1s Probe Attenuation n nnnnn This value has been entered into your channel probe setting Pressing this key selects a channel to calibrate When the channel to be calibrated has been selected press start cal The advisory appears at the bottom of the waveform display area Connect the DC Cal rear panel bnc to the probe of channel n then press continue Pressing this key prompts for setup requirements Press this key when all setup requirements have been satisfied The actual calibration process begins This is the only active front panel key during the calibration process The calibration process is terminated with the previous calibration factors intact when this key is pressed Pressing this key returns the Utility menu to the screen HP 54502A Front Panel Reference time null submenu PROBE CAL MENU citenugtiion 1 time nuif 0 00000 sf SOREL NER exit menu a 54502WOd Time null sets the timing of all channels to correspond to each other at the probe tip This eliminates time discrepancies between channels and channel to channel skew variations This is useful to manually adjust any differences in cable length time Key This is an unlabelled field The time null between the two channels can exit menu Key Pressing this key returns to the Utility menu HP 54502A Front Panel Reference be set using either of the entry devices The range is 70 ns Utili
110. t rising edge a trigger occurs and activates the holdoff timer When the holdoff time 1 02000 pus has elapsed the oscilloscope looks for another trigger The oscilloscope triggers on the first rising edge of the second burst Each trigger event occurs on a different pulse and is consequently an unstable condition By adjusting holdoff to wait until the rising edge of the second pulse passes the oscilloscope triggers only on the first rising edge and the signal is stable In this case the trigger is stable with approximately 1 02 us holdoff HP 54502A Trigger Menu Front Panel Reference 6 7 a Si ciaiicsisaiasscsal Pattern Trig ger The pattern mode defines a 3 bit pattern for the oscilloscope to recognize Mode and generate a trigger event When the inputs satisfy the trigger pattern and conditions the HP 54502A triggers and displays the desired portion of the waveform The pattern mode is very useful for glitch detection because the HP 54502A triggers on a glitch and displays the resulting waveform TRIG MENU i PATTERN TRIGGER cneamnaninaeroninesinaninasaamasnpansimansnanemmasmarenssins m trig d auto co o7 HX X When i H eniered exited e present gt present ronge ae 2Gns t6Gms Zans 168ms gt 26ns 16ams i tance i aia ar holdoff i 168 i event 4 ns 32 mns lt 26ns ms 54502812 Figure 6 5 Pattern Trigger Menu Trigger Menu HP 54502A
111. t your own thresholds for automatic measurements Both the upper and lower thres holds can be set from 25 to 125 as long as the upper threshold value is always greater than or equal to the lower threshold The middle threshold is always equai to the mid value between the upper and lower threshold Continuous Measurements Can be turned on or off With continuous measurements off the voltage and time markers are placed on the waveform to indicate where the last measurement was taken Measurement Statistics The maximum minimum and average of continuously updated measurements are calculated and displayed Any three measurements can be selected for simultaneous display Measurement Limit Test Maximum and minimum limits can be set for any three of the front panel automatic measurements These continuously updated measurements are compared to the maximum and minimum limits If the measurements are found to be outside the defined limits the waveform can be stored to a memory or the screen can be sent to a printer In addition the HP IB Service Request line can be set to flag the controller Measurement limit test can be set to stop after test limits have been exceeded or to continue testing Auto scale Pressing the Auto scale button automatically adjusts the vertical and horizontal deflection factors and the trigger level for a display appropriate to the signals applied to the inputs The Auto scale feature requires a signal with a duty cycl
112. ta value is displayed in each horizontal time position The entire waveform is replaced with each new acquisition Infinite Persistence Waveform data is allowed to continuously accumulate on the screen and remains until display is cleared Display Normal mode sets record length to 501 points Extended mode sets record length to 2001 points Specifications and Characteristics B 9 Filter At time per division settings between 500 ns div and 5 s div a digital reconstruction filter can be switched ON or OFF as desired At time per division settings between 200 ns div and 1 ns div a reconstruction algorithm is used to improve display of the waveform The filter on off menu is not available at these time div settings To look at data without the effect of this algorithm change the time per division range to 500 ns div switch the filter OFF stop the acquisition clear the display and press the SINGLE key Using the time base window feature you can now zero in on and expand sampled data Deita t Delta V Markers Dual voltage markers and dual time markers are available Voltage markers can be independently assigned to channels memories or functions Waveform Math Two independent functions are provided for waveform math The operators are X vs invert and only The vertical channels or any of the waveform memories can be used as operands for waveform math Sensitivity and offset for these functions can be adjusted independe
113. ter improves the smoothness of data collected for display rather than connecting acquired points linearly For realtime acquisition sweep speeds of 200 ns division and below this key is not present on the display menu and another filter is always on This key is not present in repetitive acquisition mode Display Menu HP 54502A 7 8 Front Panel Reference Delta t Delta V Menu 8 Introduction to the Markers AV merkers r Vmorker 2 Vmarker 1 18 05005 Neena anananasasi rreren arean m t merkers e off sanamassssssnasn tiniti stari maorker 200 000 us stop marker ms 202 000 us 54501 WF 05 ee a Ta i HP 54502A Front Panel Reference This chapter describes how to use the markers and make manual measurements on displayed waveforms In this menu two sets of markers the AV markers horizontal voltage markers and the At markers vertical time markers are controlled When the desired set of markers have been turned on the two marker fields are turned on Each marker is individually controlled paal AV morkers off oe n Vmarker 2 Z5OV 280V Vinarker 250V 250V St markers off Eaa i stort morker i 150s 150s stop marker 150s 150s 54801 BLOS Figure 8 1 Delta t Delta V Menu Delta t Delta V Menu 8 1 AV markers AY markers off rm marker 1 tE 00000 Vv erat markers on 545017 WF Q7 Vm
114. tors When all of the setup requirements are satisfied press the continue key and the actual calibration process begins This is the only active front panel key during the calibration process Pressing this key terminates the calibration process leaving the previous calibration factors intact This key returns to the Utility menu eee eee service menu HP 54502A Front Panel Reference The service menu is used firmware calibrations hardware adjustments and calibrations that need not be performed often These are explained in the service manual and are to be used only by qualified service personnel Note When ceratain calibrations have been performed other calibrations must be continued Only qualified service personnel with access to the service manual are to perform calibrations in the service menu See the HP 54502A Service Manual for complete information on the service menu and calibration cycles Utility Menu 12 11 eee eee clicker Key The clicker key turns on the clicker function When the clicker is turned on an audible click is heard each time a key is pressed The selections are either on or off i OOO Calibration Procedure Utility Menu 12 12 There are two levels of calibration for the HP 54502A The first level is in the self cal menu and suggested by HP to be performed under the following conditions e at six month intervals or every 1000 hours of use e if the ambient temper
115. tors under the waveform display area have changed to reflect the window Timebase HP 54502A 4 8 Front Panel Reference Viewing the Window The timebase width in the window is 40 ys 1 20 of 1 ms with the trigger point at center reference and 0 time delay The knob has the following actions when these fields are active HP 54502A Front Panel Reference time division field top the knob changes both timebases and displayed waveforms will change until window timebase equals the normal timebase delay the knob moves the window and waveform sideways while maintaining the same size This allows viewing of the same section of the waveform at a different point in time The two timebases will not change window timebase the knob changes only the window timebase The range is from 1 20 of the normal timebase to equal the normal timebase window position as you turn the knob the window changes position on the normal waveform allowing you to view different sections of the waveform Timebase 4 9 Channel Menu 5 Introduction to The channel menu is a two level menu and controls the vertical operation Channels of the HP 54502A This chapter decribes the use of the two input channels including vertical sensitivity offset coupling attenuation and preset levels CHANNEL Menu CHANNEL 1 2 XT offon H y Probe div 1QG 1 offset E r mi 4 Sw
116. ty Menu 12 9 ll eee Self Cal menu cal select Key Utility Menu 12 10 The self cal menu calibrates two internal functions e vertical cal e delay and repetitive cal This field selects which of the calibration processes to perform The cal select key and the highlighted window increments through 0 1 and the active field in the display changes to correspond with the selection See Calibration procedure in this chapter SELF CAL MENU x PROTECTED SYST i i OTECTED SYSTEM CAL ub E CI vertical cal 1 delay amp repetitive cai channel y 2 dly 3 a d 4 gn 5 oft 6 hys 7 tre 8 grep G trep ra 2 EXT ali ae j start cai i Ae ee ee A a a a ee tee continue N peiaesnnsnsnaninasininisasusimssinmie print cals corre H abart exit menu SER 54502W43 Figure 12 6 Self Cal Options NOTE Cal 0 must pass before Cal 1 can be performed successfully HP 54502A Front Panel Reference channel Key start cal Key print cals Key continue Key abort Key exit menu Key The channel key selects the channel to calibrate When the channel to calibrate is selected and the specific cal routine is selected press the start cal key and follow the instructions displayed The print cals key sends a complete listing of the most recent self calibration factors to a printer if connected to the oscilloscope Refer to the service manual for more information on self calibration and calibration fac
117. ure 3 6 Function Keys e Numeric key fields displayed in full bright are changed by either numeric keys on the keypad or the knob When these functions are not active they are displayed in half bright when displayed in full bright they are active e Non numeric fields displayed in half bright toggle with the corresponding function key These fields are displayed in half bright but are active for the function keys Front Panel Overview HP 54502A 3 10 Front Panel Reference a aaa instrument The HP 54502A has two methods of instrument reset Reset e Key down power up is a hard reset of the oscilloscope It is done by pressing and holding any front panel key while cycling power If input signals are not present the oscilloscope will power up displaying a baseline in the SHOW screen and set to all default settings see Table 3 1 e RECALL CLEAR performs a soft reset of the oscilloscope All default conditions are set see Table 3 1 RECALL CLEAR is the same as a key down power up except the previous menu selections are retained Table 3 1 Reset Default Conditions Timebase Menu reference centr Time Div 100 us delay 0 00 s timebase window off repetitive realtime realtime Channel Menu Channel 1 Channel 2 Volts Div offset coupling impedance probe attenuation HP 54502A Front Panel Overview Front Panel Reference 3 11 Table 3 1 Reset Default Conditions continued Trigger Menu Mode edge source Channel 1 leve
118. vel 3 5 6 1 Trigger Menu 6 1 trigger on Key 6 23 triggered scroll 4 2 TTL Key 5 5 tv Trigger Exercise 6 29 tv Trigger Mode 6 27 U Unpacking 2 1 user defined width A 5 Utilities 3 7 Utility Menu 12 1 V Vamp A 6 Vavg A 6 Vbase A 6 Vertical offset 3 5 vertical position 5 2 Vertical Resolution 1 1 Vertical sensitivity 3 5 Index 5 Vertical Sensitivity Key 5 2 Vmarker 1 8 2 Vmarker 2 8 2 Vmax A 5 Vmin A 5 volatile Key 10 3 voltage selector module 2 3 Vp p A 5 Vrms A 6 Vtop A 6 W waveform math 3 5 3 7 Waveform Math Exercise 9 6 Waveform Math Menu 9 1 waveform Menu 10 2 Waveform Save 3 7 Waveform Save Exercise 10 4 Waveform Save Menu 10 1 waveform pixel Key 10 1 when entered 6 9 when exited 6 10 when Key 6 9 6 15 when present 6 10 window Key 4 4 Window position 4 4 Window timebase 4 4 index 6 HP 54502A Front Panel Reference Algorithms A One of the HP 54502A s primary features is its ability to make automatic measurements on displayed waveforms This chapter provides details on how automatic measurements are calculated and some tips on how to improve results Measurement Setup Measurements typically should be made at the fastest possible sweep speed for the most accurate measurement results The entire portion of the waveform that is to be measured must be displayed on the oscilloscope For the most accurate measurements consid

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