Oscilloscope Probes: What You Need to Know
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- čas přidán 11. 07. 2024
- Oscilloscope probes are used with virtually every scope. They enable the signal on the circuit being tested to be connected to the scope so that the signals can be measured easily and accurately.
This video provides essential details about the different types of scope probe and how they can be used.
The most common type of probe is the voltage probe. There are two main types the x1 probe which gives better sensitivity but loads the circuit more and the x10 which has a lower sensitivity and loads the circuit less. When using a x10 scope probe it is necessary to compensate the probe to the scope to ensure the right waveform is seen.
There are also active scope probes which include an amplifier in the probe tip to provide the least loading and the best signal.
It is also possible to use current probes. These scope probes clip around a wire carrying current and enable the current waveform to be monitored.
There are many different aspects to scope probes, type, bandwidth, earthing and many more. It is essential to select the right oscilloscope probe as the scope performance will only be as good as the probe. Using the right oscilloscope probe will ensure the optimum readings are taken and the performance of the whole oscilloscope is maximised.
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Great explanation. Thanks!
Great tips! I think e-Design's DS212 Mini Oscilloscope for usb oscilloscope is good
Good video, lots of info specially for a beginner !!!
I am glad the video helped.
I understand the "loop" distance problem/issue but how about using an extension from the scope to the probe's BNC connector? I see extension cables are available but seems to be mostly for non-scope/probe applications. I guess I can just move the scope (it does have a handle) but I have an old analog type so sort of heavy/large to keep moving around.
Good stuff!
Glad you liked the video. We are trying to do some more ones about test equipment, etc. Thanks for the comment.
I like the Jithu dude. He seems like a jolly good character.
Yes he is a great guy. It is some time since this was recorded, and he is still doing very well.
Hi, Im really grateful for this video because im really dont understand how to use a probe. May i know is it possible to use hook tip connects with the 5V motor directly to test it's electricity generation in mini wind turbine? Where should i connect my earth clip to? Thankyou very much and Im appreciated for the info given.
The earth clip should be connected to earth. However you also need to ensure that the point you are measuring is also referenced to earth. But beware you don't earth something you should not. If you need to measure the difference between two points you may need an isolated differential probe. Normally though measurements are with respect to ground.
Can I ask how you connect the hook clip accessory to your scope tip? . I got a fluke scope recently and don't see how to connect it.
Normally the clip pushes on to the main probe assembly. If in doubt I suggest you contact Fluke directly as I don't have an intimate knowledge of all scopes and scope probes.
could you explain about 50 ohm input impedence? When and Why we should use it.
50 ohm impedance is the standard impedance used for RF transmission - there are many 50ohm coax feeders and lines. Using this for a scope is useful with some RF design measurements and it can give some better RF readings. But be aware that the input terminating resistor is not overloaded - it would be easy to burn it out.
I'm confused about something. I'm an auto tech and I'm trying to build a wire that connects a vehicle comm port (two-wire can-bus) to my scope. When I'm using a voltmeter to watch the voltage switching, I have to attach my negative lead to the -wire and the positive lead to the + wire. But the most popular probe (as shown in the video) has a single hook. Where is the ground coming from if the scope is measuring voltages?
There is normally a clip that fits onto he probe that is connected to ground. You can actually see these clips on the probes.
@@ElectronicsNotes I appreciate that, but what I mean is, do I need that clip to get my signal on the two wire can-bus?
sweet info... also some scopes have a common conductor to all channels whereas a few field scopes have isolated channel commons... still using the same basic probes... like 3-phase stuff... thanks
Thanks for the info
Sometimes though you just want to look at a signal and its shape without measuring it, like when you're aligning an old valve radio
I agree, but I always tended to adjust the compensation because there may be one instance where a more accurate reading is needed, or where the waveform could be distorted by poorly adjusted compensation - it only takes a few moments.
👍🌹
hi can I use 150 MHz probe on 50MHz oscilloscope?
Yes it is perfectly acceptable. If the probe exceeds the performance of the scope, then it will not degrade the performance of the scope. If the probe has a lower performance than the scope, then you the probe will be the limiting factor. The performance will reflect the item (scope or probe) with the lowest performance.
@@ElectronicsNotes thanks .
Rohde & Schwarz 🙂👍
Thanks.
1st i have a question why these probes are too expensive
You can buy both low cost and very expensive probes. The low cost ones obviously don't have the same performance as the much higher quality ones that are designed and manufactured to exacting standards, sometimes having individually adjusted elements to them to ensure very high performance at high frequencies. The coaxial cable is also specialised and manufactured to high standards as well. This all adds cost.
ElectronicsNotes according to indian currency it costs 10,000Rs means almost 145$ i dont have enough money to buy a oscilloscope but i can buy a kit and its around 15-25$ means im spending 130-110$ extra just on probes
ElectronicsNotes do you have a tutorial video on how to use oscilloscope
We don't have a video on how to use a scope yet, but we are planning one, possibly for next year. There are a few other videos in the pipeline before that and I have to get all the relevant video clips together and this will take a little time.
ElectronicsNotes im waiting but if you are taking this long time you should teach basics and ever bit advance stuff so it will be easier for people like me to understand and use an oscilloscope although thanks for replying 👍👍🙏
I can only afford a screen protector for oscilloscope.
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