HP54600 Digital Oscilloscope User Manual
Contents
1. is the trigger mode the trigger setup Rashes in the status line Press Slope Coupling A softkey menu appears on the display If you selected Auto level Auto Normal or Single as a trigger mode six softkey choices are displayed If you selected TV as a trigger source ve other softkey choices are available Toggle each of the softkeys and notice which keys affect the status line On the HP 54600B external trigger is always dc coupled If you select ac coupling or low frequency reject these functions do not occur until you change the trigger source to channel 1 channel 2 or line Adjust the holdoff knob and notice the change it makes to the display Holdoff keeps the trigger from rearming for an amount of time that you set with the Holdoff knob Holdoff is often used to stabilize the complex waveforms The Holdoff range is from 200 0 ns to about 13 5 s It is displayed for a short time in inverse video near the bottom of To use roll mode Roll mode continuously moves data across the display from right to left It allows you to see dynamic changes like adjusting a potentiometer on low frequency signals Two frequently used applications are transducer monitoring and power supply testing Press 2 Press 3 Press Mode Then press the Auto Lvl Auto or Normal softkey Main Delayed the Roll softkey The oscilloscope is now untriggered and runs continuously Also notice that th2. of the oscilloscope so that the measurement results reXect the actual voltage levels at the probe tip 2 To set the probe attenuation factor press 1 Next toggle the Probe softkey to change the attenuation factor to match the probe you are using You should compensate 10 1 probes to match their characteristics to the oscilloscope A poorly com pensated probe can introduce measurement errors To compensate a probe follow these steps 1 Connect the 10 1 probe from channel 1 to the front panel probe adjust signall on the oscilloscope 2 Press Autoscale 3 Use a nonmetallic tool to adjust the trimmer capacitor on the probe for the Hattest pulse possible as displayed on the oscilloscope as shown in Figure 4 To display a signal automatically The oscilloscope has an Autoscale feature that automatically sets up the oscilloscope to best display the input signal Using Autoscale requires signals with a frequency greater than or equal to 50 Hz and a duty cycle greater than 1 HP54600 Digital Oscilloscope User Manual Press this key f Jj o E ERC jl JB 5 HH als x a Rell moda D G E To obtain this menu V 1 Couping BW Lim Invert Vernier Prabe dE ERSEZRS oe EU 0 0 Caup ng p V 0iv Probe 3 Ra GE Cy v 0 0 SS c c ca c3 acre Channel Moth fm e a SSS c cl c c Horizontal Moda 4 Vernier T
3. triangle symbol The solid triangle symbol indicates the trigger point and it moves in conjunction with the Delay knob The open triangle symbol indicates the time reference point If the time reference softkey is set to left the open triangle is located one graticule in from the left side of the display If the time reference softkey is set to center the open triangle is located at the center of the display The delay number tells you how far the open triangle reference point is located from the solid triangle trigger point All events displayed left of the solid triangle trigger point happened before the trigger occurred and these events are called pretrigger information You will nd this feature very useful because you can now see the events that led up to the trigger point Everything to the right of the solid triangle trigger point is called posttrigger information The amount of delay range pretrigger and posttrigger information available is dependent on the sweep speed selected details To trigger the oscilloscope The following exercise guides you through the trigger keys knobs and status line 1 Turn the trigger level knob and notice the changes it makes to the display On an internally triggered HP 54600B as you turn the Level knob or press a trigger menu key for a short time two things happen on the display First the trigger level is displayed in inverse video if the trigger is dc coupled it is displayed as a voltage If the
4. trigger is ac coupled or if LF reject was selected it is displayed as a percentage of the trigger range Second if the trigger source is turned on a line is displayed showing the location of the trigger level as long as ac coupling or low frequency reject are not selected 2 Change the trigger setup and notice that each change affects the status line differently e Press Source A softkey menu appears on the display showing the trigger source choices e Toggle each of the softkeys and notice that each key causes the status line to change HP54600 Digital Oscilloscope User Manual Press Mode A softkey menu appears on the display with ve trigger mode choices Toggle the Single and TV softkeys and notice that they affect the status line differently You can only select TV if the trigger source is either channel 1 or 2 When the oscilloscope is triggering properly the trigger mode portion of the status line is blank What happens if the oscilloscope loses trigger If Auto Level is the trigger mode Auto Dashes in the status line If dc coupled the oscilloscope resets the trigger level to the center of the signal If ac coupled the oscilloscope resets the trigger level to the middle of the screen Every time you press the Auto Level softkey the oscilloscope resets the trigger level If Auto is the trigger mode Auto Xashes in the status line and the oscilloscope free runs If either Normal or TV
5. HP54600 Digital Oscilloscope User Manual The following is a heavily condensed version of the User and Service Guide for the HP 54600B Oscil loscope It is intended to provide the basic information needed to learn how to use the oscilloscope for measurements in the ECE undergraduate circuits and digital systems laboratories The front panel The front panel has knobs grey keys and white keys The knobs are used most often to adjust measurement parameters and variables The grey keys bring up softkey menus on the display that allow you access to many of the oscilloscope features The white keys are instant action keys and menus are not associated with them Throughout this document the front panel keys are denoted by a box around the name of the key and softkeys are denoted by a change in the text type For example Source is the grey front panel key labeled source under the trigger portion of the front panel and Line is a softkey The word Line is at the bottom of the display directly above an unlabeled softkey which is also grey Figure 1 is a diagram of the front panel controls and input connectors of the HP 54600B Refer to this gure to follow the instructions in this document LA S STORAGE Measure BAS esr Save Recall r c i m E o Eo Storage keys Laval nl Trigger controls
6. TV Holdott Coupii i Channel External controls trigger o o Position 5 Postion gt control 5 Externe Trigger i i Z 1 External 1 i me trigger input i 213 pF i 400 V Max Horizontal controls Figure 1 HP 54600B Front panel controls Figure 2 is a status line example The status line located at the top of of the display lets you quickly determine the setup of the oscilloscope You will learn to interpret the setup of the oscilloscope from the status line Figure 3 is a diagram showing which grey keys to press to bring up the various softkey menus HP54600 Digital Oscilloscope User Manual Channel 4 is on 10 V div Delayed sweep is on 500 ns div Main sweep 500 u s div 410v EB 5001 500 s B 5 16051 41161007 2 4 00V Autostore is on Auto triggered positive slope trigger source is channel 1 Channel 3 is off Channel 2 is on 4 V div Channel 1 is on ac coupled inverted 100 mV div Peak detectis on and operating Figure 2 Display status line indicators To connect a signal to the oscilloscope To avoid damage to the oscilloscope make sure that the voltage level of the signal you are using is less than or equal to 400 V dc plus the peak ac 1 Use a cable or a probe to connect a signal to channel 1 If you are using a probe the oscilloscope allows you to enter the attenuation factor for the probe The attenuation factor changes the vertical scaling
7. alue is displayed for a short time indicating how far the ground reference is located from the center of the screen Also notice that the ground symbol on the right side of the display moves in conjunction with the Position knob Measurement hints If the channel is dc coupled you can quickly measure the dc component of the signal by simply noting its distance from the ground symbol If the channel is ac coupled the dc component of the signal is removed allowing you to use greater sensitivity to display the ac component of the signal 2 Change the vertical setup and notice that each change affects the status line differently You can quickly determine the vertical setup from the status line in the display e Change the vertical sensitivity with the Volts Div knob and notice that it causes the status line to change e Press 1 A softkey menu appears on the display and the channel turns on or remains on if it was already turned on e Toggle each of the softkeys and notice which keys cause the status line to change Channels 1 and 2 have a vernier softkey that allows the Volts Div knob to change the vertical step size in smaller increments These smaller increments are calibrated which results in accurate measurements even with the vernier turned on e To turn the channel off either press 1 a second time or press the left most softkey Invert operating hint When you are triggered on the signal you are i
8. e time reference softkey selection changes to center and right 4 Press Mode Then press the Single softkey The oscilloscope lls either 1 2 or 9 10 of the display depending on the time reference selection then it searches for a trigger After a trigger is found the remainder of the display is lled Then the oscilloscope stops acquiring data You can also make automatic measurements in the roll mode Notice that the oscilloscope briedy interrupts the moving data while it makes the measurement The acquisition system does not miss any data during the measurement The slight shift in the display after the measurement is complete is that of the display catching up to the acquisition system Roll mode operating hints HP54600 Digital Oscilloscope User Manual Math functions averaging and peak detect are not available Holdoff and horizontal delay do not affect the signal Both a free running nontriggered display and a triggered display available in the single mode only are available e Roll mode is available at sweep speeds up to 200 ms To make frequency measurements automatically The automatic measurement capability of the oscilloscope makes frequency measurements easy as the fol lowing steps demonstrate 1 Connect a signal to the oscilloscope and obtain a stable display 2 Press Time A softkey menu appears with six softkey choices 3 Toggle the Source softkey to select a c
9. hannel for the frequency measurement 4 Press the Freq softkey The oscilloscope automatically measures the frequency and displays the result on the lower line of the display The number in parentheses after the word Freq is the number of the channel that the oscilloscope used for the measurement The oscilloscope retains in memory and displays the three most current measurement results if you make a fourth measurement the left most result is dropped If the Show Meas softkey is turned on cursors are displayed on the waveform that show the measure ment points for the ght most measurement result If you select more than one measurement you can show a previous measurement by reselecting the measurement e To nd the Show Meas softkey press the Next Menu softkey key The oscilloscope makes automatic measurements on the rst displayed event To make voltage measurements automatically YOu can measure the following voltage parameters automatically with the oscilloscope peak to peak aver age rms maximum minimum top and base The following exercise guides you through the Voltage keys by making an rms voltage measurement 1 Connect a signal to the oscilloscope and obtain a stable display 2 Press Voltage A softkey menu appears with six softkey choices Three of the softkeys are voltage measurement functions Source Selects a channel for the voltage measurement Voltage Measurements Three voltage measuremen
10. igure 3 Softkey menu reference HP54600 Digital Oscilloscope User Manual Overcompensation causes pulse peaking Correct compensation with a flat pulse top Undercompensation causes pulse rolloff Figure 4 Probe compensation HP54600 Digital Oscilloscope User Manual When you press the Autoscale key the oscilloscope turns on and scales all channels that have signals applied and it selects a time base range based on the trigger source The trigger source selected is the highest numbered input that has a signal applied If a signal is connected to the external trigger input then it is selected as the trigger source 1 Connect a signal to the oscilloscope 2 Press Autoscale When you press the Autoscale key the oscilloscope changes the front panel setup to display the signal However if you pressed the Autoscale key unintentionally you can use the Undo Autoscale feature To use this feature perform the following step Press Setup Next press the Undo Autoscale softkey The oscilloscope returns to the con guration in effect before you pressed the Autoscale key To set up the vertical window The following exercise guides you through the vertical keys knobs and status line 1 Center the signal on the display with the Position knob The Position knob moves the signal vertically and it is calibrated Notice that as you turn the Position knob a voltage v
11. ime Ref Daiaysd XY Rol Eo E c c co cu ca Horizonto Mode Vernier Time Ref Main Oslayed EZ o Ed Sa Cc cl c c Trigger Source 34 Ci 2 3 4 Lins E E c3 c c c BAKE E Trigger Mode Auto Normal Singla TV i c c3 cr c3 MIE Slope Reject Moisa Rej t AC Off LF HF orr E c c amp co ca aee MTV Moda wm BB Fics risa 2 Ez EM amp c cr Lr cu c manesi Print Cimor Be f Tat Balf Cal Sareen Menu Menu Menu t c c c co c MOEH Press this key V idi E E Neat Menu Next Manu To obtain this menu i Source po Active Cursor 4 Cleor Eb vi v2 tg t2 Cursors l c c co c I p Display Mode e Avaroge Vectors Grid Normal Peok Det 64 256 On On E c c3 c a c3 OE Setup Memory 31 Undo Dafoult gi Seve Race i Autoacadie Setup c c co cu c c enar Troce Trace Mem Save tn Claor Reco Men on uem Mami Setup j oa t c cc c3 encor Beurce Voltage Maasur emants Cleor Next EEb3i vo vovg v rms Maas Menu ce amp c c ca c Show Meas p Vol Lage Measurements 3 previous ott go vmox Vmin Vtap Vboss Menu C c c c c Source Time Measurements Cieor Nart L 34 Freq Period Duty Cy Meos Menu 3 e c c co go Show Moos Tima Meosurementa 5 ay tous ott EZ swicth width RiseTime FollTime Menu F
12. nverting the inversion also applies to the trigger signal what was a rising edge now is a falling edge If the signal has a 50 duty cycle square wave or sine wave the displayed waveform appears not to invert However for signals with a duty cycle other than 50 the displayed waveform does invert as you would expect HP54600 Digital Oscilloscope User Manual To set up the time base The following exercise guides you through the time base keys knobs and status line 1 Turn the Time Div knob and notice the change it makes to the status line The Time Div knob changes the sweep speed from 2 ns to 5 s in a 1 2 5 step sequence and the value is displayed in the status line 2 Change the horizontal setup and notice that each change affects the status line differently e Press Main Delayed A softkey menu appears on the display with six softkey choices e Toggle each of the softkeys and notice which keys cause the status line to change There is also a horizontal vernier softkey that allows the Time Div knob to change the sweep speed in smaller increments These smaller increments are calibrated which results in accurate measurements even with the vernier turned on e Turn the Delay knob and notice that its value is displayed in the status line The Delay knob moves the main sweep horizontally and it pauses at 0 00 s mimicking a me chanical detent At the top of the graticule is a solid triangle symbol and an open
13. t choices are available Vp p Vavg and Vrms The measurements are determined by voltage histograms of the signal Clear Meas clear measurement Erases any measurement results from the display and removes the horizontal and vertical cursors from the display Next Menu Replaces the softkey menu with six additional softkey choices HP54600 Digital Oscilloscope User Manual 3 Press the Vrms softkey The oscilloscope automatically measures the rms voltage and displays the result on the display The oscilloscope makes automatic measurements on the rst pulse or period in the display
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