Linked Questions

0
votes
2answers
231 views

Is this type of scope probe homemade? [duplicate]

To reduce the loop area and noisepick up, the GND lead of the scope probe is very next to the tip in the below probe: I don’t have such probes and my scope probe GND leads are much longer alligator ...
19
votes
5answers
25k views

What can reduce overshoot and ringing on a simple square wave pulse generator?

I've built a simple RC and Schmitt-trigger-based square wave pulse generator. On the breadboard, it has some obvious unwanted qualities due to jumper length, the breadboard itself, etc. Schematic and ...
14
votes
3answers
9k views

How do you attach an oscilloscope ground spring?

Sometimes you need to ensure that your oscilloscope probe ground lead is not creating measurement error such as ringing and overshoot. In various forms, I have seen (and successfully used) a ground ...
5
votes
2answers
3k views

How to remove 20MHz SPI signal noise?

I did some SPI software configuration for my DSP board. Then I soldered several missing 0 ohm resistors onto the board so I can tapping the SPI signal from pin headers. Then I measured the SPI Chip ...
2
votes
3answers
2k views

How to identify if noise is coming from circuit or scope?

Occasionally, I'll be probing a circuit and would expect to see something specific and sometimes I see either crap or the signal im expecting with crap. This video from EEVBLOG is a good example of ...
6
votes
3answers
842 views

Oscilloscope noise reduction when measuring IC voltage

I am trying to monitor the voltage of an IC. The supply voltage of the IC is 3.3V and clock frequency is 24MHz. Here are some parameters for the channel used for measuring voltage: vertical scale to ...
4
votes
1answer
974 views

Ringing/Noise on smps output while BJT turns on

I am trying to build a 4watt SMPS with 5v output.The design uses BJT switching in quasi-resonant mode. Though I could get the 5V output, I am observing ringing in the output which is increasing the ...
6
votes
4answers
312 views

Ringing on SPI square wave and other SPI issues

I've just started learning this material not too long ago and need some help. I'm trying to communicate with SPI from an AD7124-4 ADC IC to an ESP32. The first problem I'm having is I'm getting a ...
8
votes
3answers
2k views

Is there a common name for scope collar clips?

I am looking for spare scope collar clips (which attach the ground lead to the scope probe), so that I can make some custom ground attachments for connecting probes to some PCBs. The current crocodile ...
5
votes
1answer
1k views

Why does my crystal oscillator spike so much?

I just got a new oscilloscope (Rigol DS1102E) and I'm new to EE in general. One of the first things I put on the scope was my 3.579Mhz "TKD" crystal oscillator. ...
0
votes
2answers
1k views

Output impedance of an oscillator

I'm using a 27MHz oscillator and trying to measure its voltage level and waveform with oscilloscope. But I have no idea how to match the impedance of oscillator and oscilloscope, since the data sheet ...
2
votes
2answers
695 views

noise caused by square wave signal

I am using electronic switches to create non-TTL square wave clocking. The oscilloscope graph demonstrates two measurements: Yellow signal: 0-8V Blue signal: 0-5V As you can see, yellow signal is ...
1
vote
3answers
464 views

What can cause an oscillator output voltage to go higher than expected?

I am currently testing a 50MHz 3.3V CMOS oscillator in my circuit, which is connected to two pins/loads - MCU pin and Ethernet PHY pin. The oscillator is rated for 15pF output load, which I could be ...
4
votes
1answer
539 views

Acceptable voltage spikes

I have been combating EMI from a motor switched by a relay but have managed to get it under control or so I think: It started like this: 30+ voltage swing @ 5.000us+ After an AC snubber, opto-...