Questions tagged [oscilloscope]
A piece of measurement equipment which can visualize one or more signals simultaneously on a time scale.
1,096
questions
5
votes
2answers
274 views
Differential probe input impedance 1Meg, but 50ohm oscilloscope mode recommended
I will be experimenting with the Keysight company's N2792A differential probe.
Looking at the datasheet of the probe, the input impedance is 1Meg, but it is said to be used with the 50ohm impedance ...
1
vote
0answers
45 views
317-325Hz signal with probes detached on JYE Tech DSO Shell
The picture shows DSO Shell JYEtech (in a custom battery powered enclosure - for convenience) with probes shortened (same occurs if probes are not attached at all) with a what appears as a stable ...
0
votes
1answer
63 views
How does an oscilloscope synchronize its screen refresh to the waveform?
Say I am using a DSO to measure a waveform whose frequency is on the order of megahertz. I am certain that my DSO cannot refresh its screen that quickly, but it is obviously possible to stabilize a ...
0
votes
2answers
91 views
How do you input the voltage signal to an oscilloscope?
I was watching this tutorial on "analyzing actual Ethernet encoding"
https://www.youtube.com/watch?v=i8CmibhvZ0c&ab_channel=BenEater
Orange pair is transmitting data to the oscilloscope ...
0
votes
0answers
25 views
Is there an alternative to GCV (generator control voltage) to synchronize frequency sweep measurements?
A friend is taking a course in electronics engineering and asked me for help reproducing a lab experiment in frequency sweep measurement techniques. Students build a small RC filter and use a function ...
0
votes
1answer
41 views
What is voltbase and timebase?
I worked with a digital oscilloscope which could automatically save data on a pendrive, but when I checked the data, I found it in different form. In excel sheet are given two things named "...
9
votes
4answers
2k views
Differences between oscilloscope, multimeter, and power supply voltage readings
So I recently got myself an oscilloscope and am trying to learn how to use it by starting with the basics, a circuit with a voltage source, and a resistor. When I set my power supply to 5V, the ...
1
vote
0answers
29 views
What are the IEC standards/certifications to look for in a DSO while making measurements pertaining analog parameters like CMRR, SNR, THD etc
I am in the process of measuring CMRR for our mixed signal system that deals with bio-signal acquisition. I am using DSOX2014A keysight entry-level oscilloscope to make measurement to derive CMRR, SNR ...
0
votes
2answers
64 views
Analog Oscilloscope Flickering Signal Problem
I am using BK Precision 2125C Dual Trace Oscilloscope (30 MHz), which is analog. I'm trying to observe signal generated by the output of microprocessor. I'm seeing flickering signal (quickly moves ...
0
votes
2answers
41 views
How to superimpose 2 signals to test op amp circuit noise inmunity
I have a simple circuit with uses a non-inverting op amp. Just for the shake of my learning, I want to add some noise to the op. amp.'s input and see if I can remove it applying filters.
To do this, I ...
0
votes
1answer
40 views
Waveforms of BLDC motor
I am using L6235 to drive a BLDC motor with hall sensors, but I am not sure about the motor's wire connection. Can you tell which connection is correct by looking at the waveforms?
datasheet of L6235: ...
1
vote
2answers
48 views
Not visualizing signal in oscilloscope when a speaker is connected
Hope you can help me with this, because I really don't understand what is happening.
I have the following electronic circuit.
The Arduino is generating a tone and I am changing the volume with a ...
1
vote
2answers
58 views
Oscilloscope bandwidth and PWM pulse width
I've been working on a project which involves a PWM signal that operates at 30khz with a 10 bit resolution. I am generating the signal with a Teensy 4.0, which has a 600mhz processor, well above the ~...
-1
votes
1answer
93 views
Oscilloscope can't detect voltage and waveform
I am having a trouble with my research.
I am using a function generator to deliver electrical voltage to a wire and when I check it with the oscilloscope, it detects nothing (waveform, voltage.) Is it ...
0
votes
3answers
97 views
Is there a standard way to probe SPI without causing data corruption?
When I connect my oscilloscope probes to my SPI lines, the line voltages get affected a lot and so my SPI comms fail.
I am using a breadboard as an intermediary between the two devices and adding ...
6
votes
1answer
204 views
Transformer different resulting current and voltage than expected
I am uncertain why the current on the secondary side does not follow the equation:
$$i_2 = \frac{N_1}{N_2} i_1$$
which gives
$$i_2 = \frac{20}{3} i_1$$
To measure the current I use two 1 ohm resistors ...
1
vote
2answers
75 views
Practical formula/method to predict the necessity of termination resistor
I am not into high frequency much and just know about ringing caused by reflections due to impedance mismatching in transmission lines.
So I recently saw some non-engineer researchers in a lab that ...
0
votes
1answer
12 views
ADALM Mk2 Scripting environment not printing to console
I have a ADALM MK2 module.
I am trying to do Scopy scripting.
I have a script test.js with only one line:
printToConsole("hello")
nothing prints,
any ideas?
(i call the script with Scopy --...
0
votes
1answer
38 views
Frequency of the standard battery discharge curve
What can we say about the frequency of the discharging battery? You know that batteries, for example Li-Po, have a characteristic charge and discharge voltage curve. And under a certain rate of ...
0
votes
0answers
23 views
Inaccurate differential voltage measurement
I tested 3-level PFC voltage initialization event in practice using 1 x single ended probe to measure the output voltage as well as 3 x differential probes to measure the precharge voltage levels of ...
1
vote
2answers
85 views
Why does an overcompensated oscilloscope probe give spikes higher than the input voltage?
Does anyone knows why an over compensated probe gives voltage spikes bigger than the maximum voltage of the input signal (or bigger Vpeaks?)
These spikes looks to me like a parasitic inductance but I ...
0
votes
1answer
53 views
Understanding specifications
I have a differential signal which I want to measure with a differential probe.
While reading the specification of the probe, I got confused with a few terms.
Can someone what the highlighted terms ...
0
votes
0answers
48 views
What are these on the probes
I am having a Lecroy differential probe and trying to measure a LVDS signal. This is the Reference Manual which I am referring to as a guide.
My differential probe tip/lead model number : DX20 - SP/SI/...
0
votes
0answers
16 views
How to implement “burst” functionality for bare-bones function generator
Some fancy function generators have a burst feature which gives precise control over on-time and periodicity of the desired waveform.
Ex: For my application, I have a 25 MHz sin wave (2.5 Vpp) and, in ...
1
vote
2answers
107 views
Visualize the Arduino PWM's output by means an oscilloscope
I'd like to visualize the PWM signal from an Arduino Uno board with an oscilloscope.
I'd like to use this layout:
Is this a safe connection?
In other words, might I have problems because the ...
11
votes
7answers
3k views
I don't understand why it is necessary to use a trigger on an oscilloscope for data acquisition
I just can't understand why this is completely necessary. Take a sine wave for example. It's repeating. Can't the oscilloscope really "choose" anywhere to start the data acquisition. Since ...
0
votes
2answers
42 views
Oscilloscope: trigger and multiple periods of the signal
I am trying to understands the basics of an analog oscilloscope trigger. As stated here,
Instead of collecting a single snapshot of the input signal, an
oscilloscope repeatedly updates the display ...
0
votes
1answer
53 views
Practical ways to associate a known pulse to an adequate oscilloscope bandwidth
Is there a rule of thumb for a scenario for deciding minimum required scope bandwidth whew we have a known pulse train of 5MHz repetition rate and each pulse has 1ns pulse duration?
I know that these ...
1
vote
1answer
90 views
Beginner problem: Debugging power supply
I am debugging my power supply using an oscilloscope. I have uploaded pictures of my setup, including oscilloscope reading, wiring (just power and ground with jumpers), and the power supply specs. The ...
0
votes
1answer
66 views
Linear power supply and isolated output
Recently I've attempted to use an oscilloscope to analyze directly the output of a bridge rectifier and I've learned that this is impossible and dangerous unless using an isolation transformer. Also, ...
0
votes
1answer
52 views
Could impedance mismatch explain my distorted signal?
I have a custom PCB which scales and offsets an analogue signal, using an instrumentation op-amp (INA114). When I use a scope to look at the output, it looks distorted (see images below). When I use a ...
1
vote
1answer
117 views
Oscilloscope design question
To begin with,I am not designig an oscilloscope but am curious about how certain parameters are determined. My questions might sound very trivial but I would be grateful if someone could answer them ...
1
vote
0answers
56 views
Oscilloscope 'ground' displaying at +2.4VDC
When ground-coupled, trace is a dead flat zero volts on the display. At 5V per division, DC or AC-coupled, with ground lead clipped to any point on circuit ground, the minimum voltage displayed is +...
1
vote
1answer
59 views
Safely probing low voltage isolated DC/DC converter rails with an Oscilloscope
Lets say you have a flyback with a 20V dc input and 2 secondary side outputs, 5V and 12V. The 20V power in is provided by a benchtop power supply. What is the safe way to measure the input and output ...
1
vote
2answers
49 views
Op-amp input voltage gets clipped off
I'm trying to build a simple voltage comparator using LM324N. Here is the circuit:
simulate this circuit – Schematic created using CircuitLab
The strange thing that happens is that after apply ...
7
votes
3answers
557 views
Using a miniature BNC connector on a PCB to measure high-frequency content with an oscilloscope
I am a power electronics engineer in R&D and often measure fast switching waveforms, specifically high bandwidth MOSFET gate signals. When connecting oscilloscope probes in the past I have found ...
1
vote
1answer
62 views
How can you check battery cell noise using oscilloscope
I want to power a photodiode and it outputs current in the region of nA. I am using Rigol DS4034 oscillator but I am having noise issues generated by ground loop. To solve this I want to power the ...
-1
votes
1answer
50 views
Properties of Waveform Clipping
I just completed (and submitted) a recent lab report in an electronics class on op-amp circuits. The only implementations of the op-amps so far are in the inverted and non-inverted form.
While ...
0
votes
2answers
119 views
Why am I getting this oscilloscope reading? (Half wave rectifier)
I’m trying to use a half wave rectifier with a capacitor filter and instead of getting a ripple voltage at the output it’s giving a signal that looks like white noise(pic below). Any ideas?
(a signal ...
0
votes
5answers
143 views
Soldering connector on PCB to connect to logic analyser or scope
When it comes to digital circuits, it is often important to get certain internal design signals to an I/O pin and then view it on scope. This is in-spite of all the other techniques that exist to ...
0
votes
0answers
36 views
Real World Small Signal AC Analysis
As stated in this question: Antiresonance of multiple parallel decoupling capacitors: use same value or multiple values? I have been curious to the real-world effects of different capacitors and their ...
5
votes
1answer
165 views
What is the PSPICE model of my probe + oscilloscope?
The oscilloscope and probe manufacturer gives me the following input impedance data:
Oscilloscope
Input impedance/capacitance: 1 MΩ ± 2%, 16 pF ±3 pF
Probe characteristics
Bandwidth DC to 75 MHz
...
0
votes
2answers
79 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 ...
2
votes
1answer
77 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 ...
0
votes
2answers
97 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 ...
0
votes
1answer
54 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?
...
1
vote
1answer
73 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 ...
1
vote
2answers
115 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 ...
0
votes
1answer
97 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 ...
1
vote
2answers
279 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 ...
