How To Use The OTK

  1. The OTK comes with a non-rechargeable watch battery (CR2032). This is to be installed, with the topside (positive) facing up. This is done by sliding it into the battery holder. Be careful not to damage the black heat-shrink tubing on the battery holder arm - this prevents short circuits occurring when using the OTK via USB, without the battery installed.

  2. Remove the clear PVC tube from the male BNC connector pin. This helps to prevent injury when the OTK is connected to your keyring.

  3. Insert the OTK into the oscilloscope to be tested, ensuring that the male BNC connector pin mates with the female BNC connector on the oscilloscope.

  4. If powering from the battery, then simply turn on the OTK via the switch. This should illuminate the red "on" LED. This indicates that the OTK is generating a signal. If powering via a micro USB cable, then carefully insert the cable into the side of the OTK. This can be done with the OTK either inserted, or not, but the OTK switch must be in the off position to prevent accidental shorting.

  5. It can sometimes be necessary to push the OTK whilst testing, if the BNC connector is a little loose due to wear.

  6. Congratulations! You're now ready to test the oscilloscope!

Tips and Tricks for Oscilloscope Testing

If you have not tested an oscilloscope before, it can be quite daunting with all those knobs and buttons! Here's a few tips to help get you started:


This is by far the easiest way to test an oscilloscope, you simply plug in the OTK, and press the "Auto" or "Autoset" button.  This is a feature of most modern oscilloscopes, so if you can't find a button then no worries, read on for some more tests.


The outcome of this should be a sine wave, similar to the one shown above. This was generated with anb OTK device. 

Still need help? Why not drop me a message on the live chat with the model number of the oscilloscope, I'll help you to the point where you can see the waveform on the oscilloscope!