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Oscilloscopes

HP 54600B. Digital Oscilloscope. Oscilloscopes. Alex Jones COE 0501. Protect Yourself:. Avoid contact with Voltage or Current Sources. •. Use shrouded test leads and alligator clips. •. Leads:. Connect to oscilloscope first;. Connect/disconnect at source so loose lead is dead. •.

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Oscilloscopes

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  1. HP 54600B Digital Oscilloscope Oscilloscopes Alex Jones COE 0501

  2. Protect Yourself: Avoid contact with Voltage or Current Sources • Use shrouded test leads and alligator clips. • Leads: Connect to oscilloscope first; Connect/disconnect at source so loose lead is dead. • Connect probe to ground before connecting to high. Protect the Scope: • 400V maximum on input. • Use probes to reduce high voltages. • Be familiar with user’s guide. Safety Tips

  3. Oscilloscopes • Oscilloscopes display the relationship of Voltage vs. Timewaveformsfor analog and digital signals. • The display is like a dynamic plot. Therefore we must be able to adjust the scales and offsets of the “plot” of the waveform. • Voltage - set the Input / vertical scale factor • Time- set the horizontal / time scale factor • Position (Vertical and Horizontal) • Triggering - when should it start to draw? • Storage - keep a copy • Measurement - measure features of the waveform

  4. Save/Recall Autoscale/ Display/Print Triggering Vertical Scale Intensity Ground Inputs External Trigger Calibration Power Front Panel Features Horizontal Position Measurement Cursors Storage Vertical Position Horizontal Scale What’s wrong with this picture?

  5. Task - Front Panel • Draw a picture in your lab notebook of the front panel of your scope. • Every button, knob, and connector should be depicted and labeled. • Use an entire page of your lab notebook for this.

  6. Task - Front Panel • On the next page of your notebook, make a list of the buttons, knobs, and connectors on the front panel. • As you learn about each item in the list, write a brief description of it in your notebook.

  7. • This switch turns the oscilloscope on and off. Power Switch

  8. • This knob adjusts the brightness of the display • If no trace is seen, it may be because the intensity knob is set too low. Intensity Knob

  9. • This connection may be used to ground probes. Ground Connection

  10. • These connections are used to connect coaxial cable, probes, etc. to the oscilloscope. • The outside of the connector is grounded. Signal Inputs

  11. £ • Make sure the input voltage level 400 V. • Connect a BNC cable or a probe to a channel input. • Connect the other end of the cable or probe to the device to be measured. Connecting a Signal

  12. Task - Calibration Signal • Connect a probe to channel 1. • Connect the red lead to the calibration signal below the display. • Push the Auto-scale button. • Draw a picture of the resulting waveform in your lab notebook.

  13. addition menu volts per division volts per division channel menu channel menu position knob position knob Vertical Section

  14. Input Selection • Use the push buttons to enable/disable eachchannel. • These also enable the “soft keys” under the display

  15. D V DC vs. AC Coupling • For digital signals we almost always want DC coupling. • AC coupling centers the signal on 0v • Digital signals swing between 0v and 5v

  16. • Use the vertical volts/div knobs (located above the channel input connector) to scale the signal vertically on the screen. Vertical Scale

  17. Task - Calibration Signal • Adjust the volts/div knob so that the entire calibration waveform is visible on the screen, and appears as large as possible. • Record the volts/div setting in your lab notebook. • Use the scope to measure the amplitude of the calibration waveform.

  18. • Use the vertical position knob (located above the channel input connector) to position the signal vertically on the screen. Vertical Positioning

  19. delay knob main/delayed menu time per division Horizontal Section

  20. • Turn the time/div knob to adjust the sweep speed (time base). • The sweep speed has a range from 2ns to 5s. Time Base

  21. Task - Calibration Signal • Adjust the time/div knob so that one period of the calibration waveform is visible. • Record all time base parameters in your lab notebook. • Use the scope to measure the period of the calibration waveform. • Compute the frequency of the waveform.

  22. • Use the delay knob to move the signal horizontally. • Note the value displayed on the status line. Horizontal Positioning

  23. source menu trigger level knob mode menu slope/coupling menu holdoff knob Trigger Section

  24. • Use this menu to assign a trigger source. • The choices are line, CH1, CH2 and external. Triggering Source Menu

  25. • Use this menu to choose a trigger mode. • The choices are auto level, auto, normal, single, and TV. Triggering Mode Menu

  26. • Use the level knob to set the trigger voltage. • The screen will display the trigger level in inverse video and a horizontal line representing the trigger location. Triggering

  27. 1 Delay Triggering level + Slope - Slope Triggering

  28. Custom Features Autoscale Voltage menu Time menu Cursor menu Storage Delay

  29. setup menu time menu voltage menu cursor menu trace menu cursor knob autoscale print/utility display menu Custom features

  30. £ • Sets the Time Scale and Vertical Scale for all inputs Uses the highest active channel (1,2,3,4, ext) as trigger • Auto Scale

  31. • Use this menu to make automatic voltage measurements. made using the softkeys below the display. • Measurements include peak to peak voltage, rms voltage, max voltage, etc. The choice is Voltage Menu

  32. Vp Vrms Vpp time Vrms = 0.707 Vp (Sine wave) Voltage Readings

  33. • Use this menu to measure frequency, period, duty cycle, risetime, etc. Time Menu

  34. Period 1 T Hz f = T w = 2 × p × f rad/s ( t ) time Frequency and Period

  35. • This menu brings up a list of cursor commands and activates the cursor knob. • The cursors can be used to measure specific voltages, times, etc. Cursor Menu

  36. Storage • These buttons control the storage features of the scope. • Run, Stop, Auto-store, Erase • Save, Recall

  37. Storage • Run - Normal operation • Stop - Keep the most recent trace, do not overwrite • Auto-Store - Keep overwriting traces, with dim lines • Erase - Erase all traces • Save/Recall • Trace - Can store 2 “screen dumps.”Brings up soft keys • Settings - Can store scope settings for reuse

  38. Delay • This button enables the use of two time-bases for the same signal • This gives the ability to have a global and zoomed picture of the waveform at the same time. • It enables a soft key menu (XY, Vernier, Time Ref)

  39. Storage • Run - Normal operation • Stop - Keep the most recent trace, do not overwrite • Auto-Store - Keep overwriting traces, with dim lines • Erase - Erase all traces • Save/Recall • Trace - Can store 2 “screen dumps.”Brings up soft keys • Settings - Can store scope settings for reuse

  40. End of Scope Presentation

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