Model Scope Probe Ground & Signal Lead Impedances

  • Thread starter likephysics
  • Start date
  • Tags
    Filter Lc
In summary, to model a scope probe ground lead and signal lead, you can start with a schematic for a typical 10x 'scope probe and add the ground lead inductance into the model. You can also use Google Images to search for an oscilloscope probe schematic and find various resources and examples for modeling the inductance.
  • #1
likephysics
636
2
I am trying to figure out how to model a scope probe ground lead and signal lead.
Both leads would have some impedance and the probe would have some pf capacitance.
How to deal with both the inductances?
 
Engineering news on Phys.org
  • #2
likephysics said:
I am trying to figure out how to model a scope probe ground lead and signal lead.
Both leads would have some impedance and the probe would have some pf capacitance.
How to deal with both the inductances?

Have you seen the schematic for a typical 10x 'scope probe? You can start with that, and add the ground lead inductance into the model. If you use Google Images to search for oscilloscope probe schematic, you get images and links like the one below.

To model the inductance, start with the loop inductance for a loop the same size as that formed when you connect the probe tip and ground lead near each other in a circuit.

http://electronics-diy.com/schematics/967/Scope-Schematic-1.jpg
Scope-Schematic-1.jpg
 

1. What is the purpose of a model scope probe?

A model scope probe is used to measure electrical signals in electronic circuits. It is a device that connects to an oscilloscope and allows for precise measurements of voltage and current.

2. What is the difference between a ground lead and a signal lead on a model scope probe?

A ground lead is used to provide a reference point for the measurement, while a signal lead is used to measure the actual electrical signal. Ground leads are typically connected to the ground of the circuit being measured, while signal leads are connected to the points of interest on the circuit.

3. How do impedance mismatches affect the accuracy of a model scope probe?

Impedance mismatches occur when the impedance of the probe does not match the impedance of the circuit being measured. This can cause reflections and distortions in the signal, leading to inaccurate measurements. It is important to use probes with matching impedance to ensure accurate results.

4. Can the impedance of a model scope probe be adjusted?

Yes, some model scope probes have adjustable impedance settings. This allows for better matching of the probe to the circuit being measured, resulting in more accurate measurements.

5. How can I troubleshoot issues with a model scope probe's impedance?

If you are experiencing issues with your model scope probe's impedance, check for any loose connections or damaged cables. You can also try adjusting the impedance settings or using a different probe altogether. If the problem persists, it may be necessary to consult the manufacturer for further assistance.

Similar threads

  • Electrical Engineering
Replies
21
Views
1K
  • Electrical Engineering
Replies
12
Views
840
Replies
10
Views
428
  • Electrical Engineering
Replies
5
Views
708
  • Electrical Engineering
Replies
21
Views
1K
  • Electrical Engineering
2
Replies
51
Views
4K
  • Electrical Engineering
Replies
15
Views
1K
Replies
1
Views
718
Replies
8
Views
933
Replies
33
Views
2K
Back
Top