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Velleman-Kit EDU08 Manual

Educational lcd oscilloscope
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EDUCATIONAL LCD
OSCILLOSCOPE
fr Kit d'oscilloscope éducatif - afficheur lcd
nl educatieve lcd-oscilloscoopKit
de oszillosKop-lernpaKet - lcd-display
es Kit educativo con oscilloscopio - pantalla lcd
w w w.v e l l e m a n p r o j e c t s . e u
e D u 0 8
Discover the
worlD of electronics

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Summary of Contents for Velleman-Kit EDU08

  • Page 1 e D u 0 8 EDUCATIONAL LCD OSCILLOSCOPE Discover the worlD of electronics fr Kit d'oscilloscope éducatif - afficheur lcd nl educatieve lcd-oscilloscoopKit de oszillosKop-lernpaKet - lcd-display es Kit educativo con oscilloscopio - pantalla lcd w w w.v e l l e m a n p r o j e c t s . e u...
  • Page 2 Velleman N.V. Legen Heirweg 33 9890 Gavere (België)
  • Page 3 Subscribe to our newsletter?, visit www.vellemanprojects.eu Forum Forum Need support? Check our Velleman Projects Forum...
  • Page 4 Build your own oscilloscope and learn how to visualize signals. See the signals you learn about in real life! Despite the low cost, this oscilloscope has a lot of features found only on expensive units like signal markers, frequency, dB, true RMS readouts,... A powerful auto-setup function will get you going in a snap! Note: This scope cannot be used to perform measurements on voltages higher than 30Vpp.
  • Page 5 assembly 1. Assembly (Skipping this can lead to troubles ! ) hints Ok, so we have your attention. These hints will help you to make this project successful. Read them carefully. 1.1 Make sure you have the right tools: • A good quality soldering iron (25-40W) with a small tip. •...
  • Page 6 DO NOT BLINDLY FOLLOW THE ORDER OF THE COMPONENTS ON THE TAPE. ALWAYS CHECK THEIR VALUE WITH THE PARTS LIST! - 6 -...

  • Page 7: Display Pcb

    Construction A. CONSTRUCTION This educational LCD oscilloscope consists of three parts: the base PCB, the display PCB and the rear panel. First we assemble the display pcb and then the base PCB. On the display module we mount components on both sides. We start at the solderside and finish with the components on the component side.
  • Page 8 Construction Base PCB Diodes IC-socket Trimmer ‰ D1 : BAT85 Watch the position of the notch! ‰ RV1 : 5K (Gain) ‰ D2 : BAT85 ‰ IC1 : 16p ‰ RV2 : 5K ‰ D3 : BAT85 (Offset) ‰ IC2 : 8p ‰...
  • Page 9 Construction Electrolytic capacitors Vertical resistors PCB tab ‰ R1 : 2,2Ω (2 - 2 - B - B) ‰ C22 : 10µF ‰ C25 : 100µF ‰ R2 : 2,2Ω (2 - 2 - B - B) R... ‰ C23 : 10µF ‰...
  • Page 10 Construction Mounting the test leads Mounting the battery holder STEP 1: Strip both cables and twist the wire STEP 1: Stick one part of the included hook-and-loop strap (hooks) ends of each cable. on one of the long sides of the battery holder. STEP 2: Thin the wires.
  • Page 11 Assembly B. ASSEMBLY STEP 1: Place the base PCB on top of the backside of the cardboard cover and trace the opening on the cardboard. M3 nut STEP 2: Stick the other part of the hook-and-loop strap (loops) in the centre of the traced area on the cardboard cover and put the parts together.
  • Page 12 Calibration C. CALIBRATION Fine tuning of the input amplifier circuit requires a 1.5V battery. This calibration is optional. You must only do this, if you want a higher precision of your measurements. To adjust the “Offset” trimmer RV2: - Connect the (+) of the test lead with the (-). - Press the Menu button.
  • Page 13 Controls D. CONTROLS • Changing the volts/div. • Changing the setup mode in the setup menu. • Changing the position of the time markers during HOLD-mode. • Changing the timebase. • Scrolling up/down in the setup-menu. • Changing the position of the voltage markers during HOLD-mode. Changing the position of the trigger level during RUN-mode.

  • Page 14: Screen Layout

    Turning on E. TURN ON At turn-on the splash screen below is displayed. IMPORTANT!: You should not attempt to measure voltages beyond 30Vp (=30VDC or 21VAC). If you are unsure if the voltage you’re about to measure is within the limits of the scope, then don’t measure it, or check with a multimeter first.
  • Page 15 Test pin G. THE TEST PIN Connect the RED alligator clip to the pin marked ‘Test’. TESTPIN If your scope is working correctly, you should see a square wave displayed: ) Do not connect the BLACK alligator clip. The test pin provides a square wave output with a frequency of approximately 2kHz (2000Hz). Note that the volts/div and time/div settings have automatically changed, to ensure a correct visualisation of the signal.
  • Page 16 Menu H. THE MENU Press the MENU button to display the menu: Page 1: Page 2: UP and DOWN arrow buttons allow you to scroll trough all menu items on page 1 and 2. LEFT and RIGHT arrow buttons allow you to change the settings. Press MENU button again to leave menu and enable your selection.
  • Page 17 Menu Coupling: Select the desired input coupling: Show: • AC: Only the AC-component of the signal is displayed Select the vertical marker readout: • DC: Both the AC and the DC component of the signal is displayed • Time mark: Display time between the 2 vertical markers •...
  • Page 18 Let’s measure I. LET’S MEASURE Measuring DC voltage: Measuring a 9V battery (not incl.) First, make sure that your scope is properly Open the menu, scroll down to Measure and Now, swap both alligator clips and check what calibrated (see page 12). select Vdc.

  • Page 19: Displaying And Measuring Waveforms

    Let’s measure Displaying and measuring waveforms: We have a nice waveform available at the test Now the position of the waveform changes, as pin, it is perfect for our measurements. the DC component of the signal is blocked. Turn off the scope, connect the red alligator The scope only displays the AC part, which is clip to the ‘test’-pin and turn on the scope.

  • Page 20: Triggering And How To Use It

    Let’s measure Triggering and how to use it: Triggering helps us to get a stable trace on the If you move the trigger level to a point lower screen and it also allows us to capture events. than the signal, the scope will no longer re- fresh the trace, as the trigger level is no longer When ‘AUTO Volt’...
  • Page 21 Let’s measure Look closely at the signal now (left), do you see the difference with the previous screenshot of our signal (right)? Single: Sometimes, you would like to ‘capture’ a certain event, instead of continuously Next, leave the menu and set the trigger level as shown below: looking at a signal.
  • Page 22 Let’s measure The display will look more or less like below: Now, touch the red alligator clip with your finger. Your body acts like an antenne and touching the clip will induce ‘noise’ to the input of the scope. The unit will trigger and the display will show a single screen of the noise you’ve injected trough your finger. Next, the scope will switch to ‘HOLD’- mode.
  • Page 23 Make sure to check out our EDU6 Oscilloscope tutor kit. It features lots of information and a number of experiments to familiarise yourself with the basics of an oscilloscope. Start to measure using your EDU08 osciloscope. Learn all about its features and perform For more in-depth info about oscilloscopes simple measurements.

  • Page 24: Oscilloscope Terminology

    Oscilloscope terminology OSCILLOSCOPE TERMINOLOGY Volts/div: Determines how many volts the signal at the input must swing for the trace to move one division. Time/div: Determines the time the trace needs to scan from the the left hand side to the right hand side of a division. Division: Imaginary or visible grid on the oscilloscope screen.
  • Page 25 Oscilloscope terminology Clipping: When the ‘top’ or ‘bottom’ or both extremes of a signal are cut-of (‘clipped’), e.g. because the signal cannot swing any further due to power supply limitations. An undesired property of amplifiers that are driven beyond their specs. Also happens when a too small Volt/div setting is selected or the signal the input of the scope is beyond the specs.
  • Page 26 Theoretically the sample rate needs to be twice the max. frequency of the applied signal, however, for best results a sample rate of 5 times the max. frequency is recommended. The EDU08 samplerate is max. 1MS/s for repetitive signals, 100kS/s in real time.
  • Page 27 BASE PCB - 27 -...

  • Page 28: Display Pcb

    DISPLAY PCB - 28 -...
  • Page 29 DISPLAY PCB - 29 -...
  • Page 30 Diagram - 30 -...

  • Page 31: Open Collector Outputs

    Leds and how to use them Leds feature a specific voltage Never connect leds in parallel drop, depending on type and colour. Check the datasheet for exact voltage drop and rated current ! How to Calculate the series resistor: Example: operate a red led (1.7V) on a 9Vdc source. Required led current for full brightness: 5mA (this can be found in the datasheet of the led) Supply voltage (V) - led voltage (V) = series resistance (ohms)
  • Page 32 Velleman nv, Legen Heirweg 33 - 9890 Gavere (België) Modifications and typographical errors reserved. © - HEDU08- 2013- ED1...

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