EDU09 EDUCATIONAL PC OSCILLOSCOPE KIT W W W.V E L L E M A N P R O J E C T S .
Velleman N.V.
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Oscilloscope • • • • • • • bandwidth: DC to 200 kHz ± 3 dB input impedance: 100 kohm / 20 pF maximum input voltage: 30 V (AC + DC) time base: 10 µs to 500 ms per division input range: 100 mV to 5 V/division input sensitivity: 3 mV display resolution readouts: True RMS, dBV, dBm, p to p, Duty cycle, Frequency… Transient Recorder • • • • • • • • • • • • • record length: 1k samples sampling frequency: 62.5 Hz to 1.5 MHz sample history function auto set-up function pre-trigger function : on 0.1 ms/div ..
assembly hints 1. Assembly (Skipping this can lead to troubles ! ) 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. • Wipe it often on a wet sponge or cloth, to keep it clean; then apply solder to the tip, to give it a wet look. This is called ‘thinning’ and will protect the tip, and enables you to make good connections.
DO NOT BLINDLY FOLLOW THE ORDER OF THE COMPONENTS ON THE TAPE.
Construction 5 IC socket I. CONSTRUCTION 1 Ceramic Capacitors c... C11...C13 : 100nF (104) C16...C19 : 100nF (104) IC1 : 16p IC2 : 8p IC3 : 28p 2 Diodes D1 : BAT85 D2 : BAT85 D3 : BAT85 D4 : BAT85 D5 : BAT85 D6 : BAT85 D7 : BAT85 D... CATHODE D... Watch the polarity! 3 Zenerdiode Watch the polarity! . ZD.. . ZD.. ZD1 : 5V1 4 Choke L1 : 100µH (1 - 0 - 1 - B) L2 : 100µH (1 - 0 - 1 - B) L. . L. . L... 1 ! 1 IC IC ... ...
Construction R23 : R24 : R25 : R26 : R27 : R28 : 11KΩ 15KΩ 20KΩ 20KΩ 20KΩ 75KΩ (1 - 1 - 0 - 2 - 1)* (1 - 5 - 0 - 2 - 1)* (2 - 0 - 0 - 2 - 1)* (2 - 0 - 0 - 2 - 1)* (2 - 0 - 0 - 2 - 1)* (7 - 5 - 0 - 2 - 1)* 9 Transistors Watch the position of the notch! SK3 13 Electrolytic capacitors C... T. ..
Construction 16 LED STEP 1: Mount the LED. Do not solder yet. STEP 2: Assemble the unit but do not yet tighten the bolts. Position the LED so that it stays just below the cover plate. STEP 3: Turn the unit 180° 25mm M3 bolts Carton cover 15mm M4 spacers STEP 4: Solder one lead and check the position. If OK, solder the second connection. LD1 CATHODE LD1 : red SOLDER STEP 5: Disassemble the unit.
Assembly 17 Mounting the test leads STEP 1: Cut off the banana plug from the test leads. II. SOFTWARE INSTALLATION Step 1: Download the EDU09 software on our website: www.vellemanprojects.eu Step 2: open the file en select the software. Step 4: Accept the license argeement Step 3: Select “next” to begin the installation procedure. Step 5: Select the destination on your PC STEP 2: Strip both cables and twist the wire ends of each cable. STEP EP 3: Solder the wires.
Software installtion Step 6: Select the start menu folder Step 7: Select additional tasks you would like to be performed. Step 8: Select “Install” for installing the software. Step 9: Click “finish” to exit setup - 11 - Step 10: Connect the unit with the pc.
Calibration & assembly III. CALIBRATION IV. ASSEMBLY There is no external driver necessary, the EDU09 uses the internal Microsoft Windows HID driver, these will loaded automatic. • • • • • Set RV1 to the middle position. Connect the EDU09 oscilloscope to the USB slot of the PC. The red led should light. Run the installed software EDU09.EXE If it is connected for the first time, calibration procedure will start automatically.
Experiments 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.
Oscilloscope terminology OSCILLOSCOPE TERMINOLOGY 1. Volts/div: Determines how many volts the signal at the input must swing for the trace to move one division. 2. Time/div: Determines the time the trace needs to scan from the the left hand side to the right hand side of a division. 3. Division: Imaginary or visible grid on the oscilloscope screen. It helps estimating signal amplitude and period. 4. Period (T): Duration of one cycle of the AC waveform (= 1/f) 3 5.
Oscilloscope terminology DC coupling: The oscilloscope displays both the AC and the DC component of a signal. Digital: Digital scopes perform an analog to digital conversion on the incoming signal and handle all the calculations and displaying in the digital domain. Digital signals feature only two fixed levels, usually 0V and +5V. See also ‘Analog’.
Oscilloscope terminology Input coupling: The drawing shows typical oscilloscope input circuit. There are 3 possible settings: AC-coupling, DC coupling and GND. With AC-coupling, a capacitor is put in series with the input signal. This capacitor blocks any DC component of the signal and passes only AC. With DC coupling, the capacitor is bypassed and both the AC and DC component of the signal are passed. Low frequency signals (<20Hz) should always be displayed using DC coupling.
PCB - 17 -
Diagram - 18 -
Leds and how to use them Leds feature a specific voltage drop, depending on type and colour. Check the datasheet for exact voltage drop and rated current ! Never connect leds in parallel 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) required current (A) closest value : use a 1k5 resistor 9V - 1.7V 0.
Velleman nv, Legen Heirweg 33 - 9890 Gavere (België) Modifications and typographical errors reserved.
