Data logger, oscilloscope, signal generator and more!

DrDAQ is a versatile instrument that connects to the USB port of any PC. Using the supplied PicoScope software it can be used as an oscilloscope, spectrum analyzer and signal generator.

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Burning oxygen - how much oxygen is required to sustain a flame: results

The PicoLog graph below shows the measured results.


Fig2: Screen capture of PicoLog


  1. What two by-products were produced by the flame?
    The graph shows that heat and light are produced when the candle is burning. This can be seen on the graph by an increase in heat inside the jar during the experiment and an increase in light level after the candle was lit. Another by-product of burning oxygen is the production of CO2.
  2. At what point did the candle extinguish?
    When the candle is burning it produces light. The light level would have dropped to zero when the candle was extinguished. This is shown at about 25 seconds in our experiment.
  3. How does the graph show you that the candle uses oxygen?
    When the candle was sealed inside the container the % of oxygen inside the container started dropping.
  4. What oxygen level is required to keep the candle burning?
    The candle was extinguished after 30 seconds when the air was made up with 18.8% oxygen. This shows that the candle flame requires an oxygen level of greater than 18.8% oxygen to remain alight.


  • The candle extinguished in 30 seconds when the oxygen level was 18.8%.
  • The temperature in the glass rose by 2.6 °C.
  • During the experiment the oxygen level decreased to 17.8%.

Credits, comments and further info

This experiment was written by J Carey at Pico Technology.


  • The kit (2408B) is of obvious quality, easy to setup and calibrate and the free to download software has a reasonable learning curve. Superb kit, superb support, what more can I say.

    Rop Honnor
  • I have been using my 4224 PicoScope for years. I travel abroad so this has been ideal due to its physical size. Storage of waveforms on my Laptop is very easy allowing me to quickly email waveforms to my Colleagues.

  • Not many USB scopes works on Win & Mac & Linux too, so that proves me that guys from Pico really cares about us, customers. This made my decision much easier when I was looking to buy an USB scope.

    Raul Trifan
  • We have been using Picoscope 6404D for quite some time, and are amazed by its accuracy and powerful emulations while working with numerous signal evaluations.

    J Mohanty
  • PicoLog TC-08: This is a very nice unit that works consistently and reliably.

    Jeff Hulett
  • It is a great scope. I had a weird problem - it did not work on one of my PC’s. Customer service gave me first class service. If I could give 6 stars for customer service - I would do so.

    Niels Larsen
  • Perfect Partner for Development of Encoder controlled Stepper Motor Actuators. Since the included software is really stable, this type of device is a great tool for great tasks!

    Helmut Schoettner
  • A superb piece of equipment worth its weight in gold

    Nigel Clinch
  • So simple to use & beats any other I have ever used hands down.

    John D Samsing
  • Great functionality in a compact size. I really like moving the mouse pointer to a position and having the Time and Voltage display the values at that point. Calibration equipment is a breeze with that feature.

    Don Horein

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