Summary of Simple Circuit to Turn your Oscilloscope into a TDR
This article describes a simple circuit that converts an oscilloscope into a Time Domain Reflectometer (TDR). By sending a pulse down a cable and observing the reflection on the scope, users can analyze transmission lines. The design is noted for being inexpensive and simpler than typical TDR setups.
Parts used in Simple Circuit to Turn your Oscilloscope into a TDR:
- Oscilloscope
- 74HC4040 counter
This simple circuit allows you to use your oscilloscope as a Time Domain Reflectometer (TDR). This is how it works. Send a pulse down a cable and watch for the reflection.
Most people think a TDR is more complicated than this. Your oscilloscope is used to sample and view the reflected waveform. In this circuit we use the 74HC4040 counter to create the length of the pulse we will send down the cable. Build this inexpensive circuit and now you will have a TDR.
For more detail: Simple Circuit to Turn your Oscilloscope into a TDR
- How does this circuit work?
It sends a pulse down a cable and uses the oscilloscope to sample and view the reflected waveform. - What component creates the pulse length?
The 74HC4040 counter is used to create the length of the pulse sent down the cable. - Is a TDR usually complicated?
Most people think a TDR is more complicated than this specific circuit. - Can I build this circuit inexpensively?
Yes, the article states you can build this inexpensive circuit to have a TDR. - What is the primary function of the oscilloscope here?
The oscilloscope is used to sample and view the reflected waveform. - Does this method require complex equipment?
No, it allows you to use your existing oscilloscope with a simple circuit instead of complex equipment.
