Questions tagged [oscilloscope]

A piece of measurement equipment which can visualize one or more signals simultaneously on a time scale.

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2answers
63 views

What type of oscilloscope can be used to troubleshoot 100BASE-T1 automotive ethernet?

I would like to implement the 100Mbps single pair automotive ethernet specified in 802.3bw, otherwise known as 100BASE-T1. I was told that in order to troubleshoot and test on this standard, the ...
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1answer
64 views

How to measure capacitor value using an LC circuit?

How would I measure the value of capacitor using an inductor of unknown value but with a function generator producing a sine wave of 1MHz? I have an oscilloscope handy. I lost the labelling on the ...
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2answers
48 views

How to use a CSV file from an oscilloscope for further analysis

I saved and opened this data from my oscilloscope: How to plot the real scale waveform data? Do I have to multiply it with vertical scale? And what about the time? What to do if I want to plot the ...
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1answer
52 views

High Speed Digital Signal Measurement

What is the best way to measure a 40 MHz clock signal? I tried using an oscilloscope with an 8pf passive probe, and the signal was unrecognizable. Would a logic analyzer work better in this case? ...
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1answer
64 views

Wave disappearing on oscilloscope

I am trying to observe a wave on my oscilloscope (with a CRT display). I can see a point on the screen tracing out the waveform, but the wave does not stay on the screen for me to say. This wave is ...
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2answers
78 views

How to measure high frequency with an oscilloscope without loading circuit down too much?

I am experimenting with building a high frequency common emitter circuit shown here. It operates at 144MHz and it should have around a gain of 4. Here is the simulated circuit. I do not have any load ...
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1answer
81 views

Class AB Amplifier - Weird oscilloscope output

I have built this little kit for a class AB Amplifier. This is the schematic if you do not want to follow the link It works fine, I can hear decent sound. I then tried to check the output with an ...
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2answers
220 views

Can you measure the voltage of a capacitor with using an oscilloscope without a function generator?

Can I just use my oscilloscope to measure the voltage across a capacitor or will I need a function generator for that? For some reason it shows what looks to be like a capacitor charging if I am not ...
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26 views

Measuring SNR on a mulltiplexed coax power and data cable

Please excuse the basic knowledge I have in this field. Within my workplace, we constantly use long 300m-6km coax cable which carries HV (Up to 400VDC) and DSL data. We have encountered problems ...
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1answer
82 views

Oscilloscope with 400 MHz but only 100 MS/s?

The Tektronix TDS430A is a 400 MHz 100 MS/s oscilloscope. I know other ocsilloscopes which could be toggled between analog mode and digital mode, so that these numbers would make sense. However, it ...
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1answer
56 views

Problem with Leader LBO-5880 oscilloscope

I have a Leader LBO-5880 oscilloscope I just bought this weekend. I don't know much about this oscilloscope: how to operate it for normal function oscilloscope without any programmable set. I have ...
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2answers
100 views

How do I tell whether if it is my oscilloscope or circuit catching mains 50 Hz?

I see that my oscilloscope has some 50 Hz when the probe only is connected to the oscilloscope, which is normal. But I want to know if my circuit is catching the 50 Hz main from e.g. the power supply. ...
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1answer
70 views

Oscilloscope and power supply measurement

If I use a switch load and an digital oscilloscope to test my linear power supply response, then which type of trigger should I use, if I want to display on CH1 the PSU output and on CH2 the output of ...
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1answer
139 views

Oscilloscope drawing - low-pass filter

I'm doing a project that can draw an analog clock on the XY mode of an oscilloscope using the Atmega88-20PU with the default clock frequency of 1MHz. To display the image I use a PWM signal applied to ...
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6answers
1k views

Can LabVIEW be used instead of an oscilloscope to measure signals?

I've been thinking about buying an oscilloscope for self usage. However, searching for oscilloscopes on Google reveals that they are very expensive - the cheapest I found was about $200. It turns out, ...
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2answers
68 views

Wheatstone bridge to create offset

While comparing schematics of two old analog oscilloscopes (Tektronix 475 and Goldstar 9020,) I was expecting many differences to get better frequency response since the first is a 250MHz and the ...
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1answer
57 views

Decoupling channels on an oscilloscope?

I have 2 x AD9833s programmable waveform generators running off the same SPI bus. Generator A is on channel 1 (yellow in the picture below) and is a sine wave set at 1 kHz. Generator B is on channel ...
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2answers
67 views

Location of power supply

I am making my own 2GHz DSO and I have question regarding position of my power supply. Many companies and hobbyists that are designing their own osciloscopes, not include power supply on their ...
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2answers
90 views

Dc power supply outputting sine wave at both terminals

I connected a DC power supply (set to 706mV) to a 1kohm resistor as this: The semantic is like: However, strange things happen when I use the oscilloscope to view the voltage waveform at point A and ...
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1answer
352 views

Why is Multisim Oscilloscope ALWAYS doubling my input voltage?

My Multisim Oscilloscope is ALWAYS doubling my input voltage. If I put a 5Vp in from the function generator, it will show a sine wave with a 10Vp in the scope. This is extremely frustrating and I ...
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1answer
45 views

Do I need more capacitance for my crystal?

I've used the formula "CL = (C1 * C2) / (C1 + C2) + Cstray" (where C1 = C2) to calculate the capacitors I need for my board. CL is 18pF, I ballparked Cstray at 5pF, meaning I should use ...
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2answers
102 views

Oscilloscope “noise”?

I'm just getting a start learning about electronics, and purchased a new oscilloscope -- a DreamSource Lab DScope U2P20 4, which uses the open-source DSView software 5. I built a simple 555 timer ...
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1answer
50 views

Short circuit while measuring

I wanted to measure a LVDS signal across the termination resistor with my oscilloscope. I tried to measure it with DC coupling and AC coupling. Using the AC coupling option led to a short circuit I ...
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1answer
64 views

Measuring frequency of a coin vibration motor

I'm trying to determine the change in frequency with voltage of a coin vibration motor (https://solarbotics.com/product/vpm2/) using an oscilloscope. So far I have tried two different set ups. Set up ...
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1answer
50 views

Peak-to-Peak vs Mean Voltage Measurement

I am using an oscilloscope with 2 probes to measure the average voltage across a resistor over time. In regard to the measurement modes for the 2 channels on my oscilloscope, I am not sure whether to ...
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1answer
57 views

What is this fluctuation I get when I use the DC electronic load?

I have a buck converter. I am loading the buck converter using an electronic load - EA-EL 9200-18T When I load 100mA at the output of the buck converter, I get this waveform: To try to find out what ...
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9answers
5k views

If a square wave has infinite bandwidth, how can we see it on an oscilloscope?

If a square wave requires infinite bandwidth how can we display it on oscilloscopes? Link: Oscilloscope fundamentals.
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4answers
118 views

Can measuring back EMF spikes damage the oscilloscope?

I want to measure the voltage across an inductor as soon as I disconnect one of its terminals to visualize how back EMF changes with and without a fly-back diode. From videos on Youtube: https://www....
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3answers
122 views

How do oscilloscopes and multimeters recognize waveforms?

Let's suppose that I am measuring a real-time periodic signal with an oscilloscope. Then I know that the oscilloscope is able to calculate the average value of the periodic waveform, and maybe even ...
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2answers
49 views

Oscilloscope probe coupling [duplicate]

I am using this buck converter. Schematic: Buck Converter Specifications : Input Voltage - 18V to 32V Switching Frequency - 300kHz Output Voltage 9V Load Current - 0mA to 200mA Maximum. When ...
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0answers
46 views

Sending an audio signal using piezoelectric sender and receiver - strange electrical behavior

I'm building a rudimentary sonar using piezoelectric discs and I wanted to test it to see if a receiving disc could hear a sending disc. I have the sender hooked up to a ATTiny85 that is sending a ...
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1answer
67 views

Are there two types of curve tracers?

I recently discovered the device class 'curve tracer', the kind that you hook up to an oscilloscope via BNC in X-Y mode to test components. It appears to me as if there would be two variants. 2 ...
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72 views

Bad oscilloscope probe does not measure DC

I seem to have messed up my oscilloscope probe during PCB testing. Too high a voltage was applied and there was arcing between the probe and a pin on the PCB. The probe can still read square waves ...
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0answers
43 views

How do I measure an 'industry standardised' noise given Vrms ~ oscilloscope settings?

I have an example of a noise source, but the specific device is unimportant to the fundamental aspect of this question. I'm trying to measure it's level with an industry standardised method so that I ...
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2answers
369 views

Oscilloscope probe noise

I am trying to measure a DC signal in the mV range. Below is the waveform I get after I connect the oscilloscope to its probe and without connecting it to anything: I am getting a ripple like ...
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2answers
68 views

Power over coax filter selection

TL;DR - How do I determine the appropriate inductor size to filter out signals at 115.2 kHz? Is the channel frequency determined by the baud rate or the signal rise time? Edit -10/5/2020 Looks like ...
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4answers
127 views

Why does this connection not become a low impedance between Positive (Isolated system) and Ground (Earth)?

I was going through a lecture regarding oscilloscope grounding methods and saw this image. Assume I have the isolated widget powered by an external battery. Now, I am going to measure the signals ...
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6answers
3k views

Why do oscilloscopes have such high sampling rates when the bandwidth is low?

Lets say we have an oscilloscope with Bandwidth:70MHz and Sample Rate:2.5GSample/s. Since we can capture adequately signals of frequency 14MHz (1/5 of bandwidth rule of thumb,) why do we need such a ...
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1answer
74 views

Why does my CD 40106 and CD 4069 inverters have such a bad output signal shape at 10 MHz?

I am measuring both the 10 MHz (5V pk-pk) input signal, and the output signal of the above mentioned inverters. Why does the output signal looks so much different than the input? I have decoupling ...
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0answers
43 views

How is the high frequencies are found in the rise time of signal? [duplicate]

I have read an article from Tektronix on how oscilloscope probes affect your meausurment here i read that: The consequence of a large capacitance value is severe because the front edge of the signal ...
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0answers
199 views

Poor man's oscilloscope - more simple

In our lab we have NI cards and work with -10 to 10V. Oscilloscopes are rare and some mobile and quick-and-dirty solution would be fine for debugging. Therefore the 'poor man's oscilloscopes' that ...
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1answer
86 views

Are analog CRT oscilloscope becoming rare? [closed]

Back in the early 2000s I bought cheap Commodore 64 sets from eBay, we were able to get huge collections for under 100 USD. Today they are rare and commensurately expensive! Today you can get analog ...
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0answers
44 views

CAN Frame Malforming on Oscilloscope

I have a working 500kbps CAN bus between an Arduino Uno and a RaspberryPi. Both are connected to MCP2515/TJA1050 boards from Amazon and communicating over SPI. The RaspberryPi dumps the CAN data via ...
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1answer
59 views

RMS and average value of a DC signal - Which is the correct way to eliminate the inaccuracies due to incorrect measurement setup?

I have a 5V DC signal and there are some ripples on top of the DC signal in the range of 50-100mV (maybe due my measurement inaccuracies or the switching noise coupling from other sources.) In that ...
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0answers
30 views

What could be the reason if the AC coupling option goes away when I attach a differential probe (P6248) to a Tek MSO5204 scope?

When the scope is not attached, I could see both AC coupling and DC coupling options for the channel settings. The moment I attach the differential probe, the AC coupling option goes away. Any reason?...
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1answer
99 views

What's the secret to “real” oscilloscopes

Okay, so at some point we've all connected things to a sound card input or an arduino analog input pin and said "look, mom! I made and oscilloscope!" And, yes, technically you can get a ...
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1answer
57 views

Search coil with ferrite not working

I am measuring magnetic fields from 50kHz to 500kHz with this search coil (air coil.) It is a wound of bell wire from the hardware store connected to an oscilloscope probe tip and ground: I have ...
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2answers
165 views

How do so many high end oscilloscopes support Gsps when most microcontrollers have ADC rates at Msps?

How do so many high end oscilloscopes support scanning rates at Gsps? Most micro controllers have ADCs reading only at few Msps.
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2answers
378 views

Why does overshooting occur when probe's adjustable capacitor is under-value

I can't wrap my head around how overshooting (the spike) happens when the 10X probe capacitor trimmer (Cp) is under-tuned (i.e. adjustable capacitor's value is not high enough). There are countless of ...
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2answers
266 views

Sine wave shows up on oscilloscope but keeps moving

I'm fairly new to electronics and new to using an oscilloscope. I followed a youtube video to setup a sine wave using an Arduino Uno and a capacitor to detect on my Tektronix 2235. https://www....

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