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Questions tagged [oscilloscope]

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

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4answers
81 views

Can’t reproduce oscillations using a simple inductor capacitor circuit?

I’m trying to reproduce a simple oscillator conductor / inductor circuit as shown here. I replicated exactly the same scheme on a breadboard and check all the connections using a led However when ...
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1answer
74 views

Noise on my oscilloscope when probing a wire

I am prototyping a NTC voltage divider circuit and I am having trouble with noise on my probe. It seems like I am constantly getting a large amount of noise (200-300mv) on my oscilloscope waveform ...
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2answers
101 views

How isolation is achieved in isolated channel oscilloscopes?

I tried to search something about this but found only a small amount of information. What confuses me is that all isolation amplifiers, optocouplers etc. I could find usually work at much lower ...
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3answers
84 views

Coloured coating within CRT

I have noticed that a lot of CRTs have a coloured coating inside of them that would appear to have practical purpose other than maybe protecting the aquadag. Paints and plastics tend to be avoided in ...
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1answer
44 views

Significant low frequency content from digital oscilloscope measurement

I have been using a digital oscilloscope to measure a fast transient signal and have then processed the data in MATLAB. Performing an FFT on the data I consistently see a significantly large low ...
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1answer
42 views

Different sampling rates for half and full channels on oscilloscope? How is it done?

In the documentation for the Keysight DSOX1204G, it has the interesting note for the sampling rate of: 2 GSa/s (half channels) 1 GSa/s (all channels) So, if I ...
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0answers
27 views

Modulation index and sidebands

I have built a Mach Zehnder interferometer in which a laser beam is first split. After each splitted beam is passed through a AOM driven at a fixed RF in my case 40 MHz and 40.04 MHz they are ...
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1answer
44 views

asymmetric signal split at SMA Tee (wires of different lengths)

I set up a circuit, as shown in the schematic below, to see firsthand how the signal paths of different lengths could lead to a phase difference. I am using an SMA Tee and there is no reason to ...
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2answers
136 views

Why the wave on a battery is neither square nor sine? [closed]

I’m measuring the electrical wave on a 1.5 V battery - why is the wave this particular shape? Isn’t it supposed to be sine or square? Thanks!
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1answer
69 views

Incoherence between oscilloscope and spectrum analyser

There seems to be an incoherence between what I see with my oscilloscope, and what I see with my spectrum analyser. I have a signal of about 1MHz (if I'm not wrong), 5mV, from an antenna, through ...
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2answers
40 views

How to measure small current waveforms using a uCurrent Gold and a mains grounded oscilloscope

I am attempting to use a uCurrent Gold as referenced by several SE posts such as measuring microampere current without noise with a mains-grounded oscilloscope, to observe the small current into an ...
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1answer
71 views

RGB video ADC for oscilloscope? [closed]

I was wondering if an ADC like this https://www.analog.com/media/en/technical-documentation/data-sheets/ad9883a.pdf would work for making an oscilloscope. Will it work? Is it suitable? added I found ...
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0answers
104 views

Digital Oscilloscopes

EDIT - I am happy with the comments to the first question, so I will replace it with a different question that I would like answers to. The 2 scopes in question are the Tektronix TBS1072B and the ...
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1answer
91 views

Understanding oscilloscope pattern

This is likely an obvious question for anyone with professional experience but I'm just a humble software engineer trying to fathom the mysteries of my oscilloscope... I created a simple square wave ...
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1answer
78 views

4 channel digital scope

I wish to view 3 phase waveforms from an alternator (DUT) through isolation transformers via a digital oscilloscope. A 4 channel oscilloscope is obviously ideal for this as I can view the waveforms as ...
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0answers
31 views

Power spectral density PSD of optical waveform given in power [mW]

Sanity checking- if I'm given the optical waveform in time on an optical oscilloscope given in units of uWatts (power) already, and I need to do a fft to get the power spectral density, I don't need ...
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0answers
31 views

Trying to view CM and DM components of a signal on a two channel digital scope screen

I want learn how to view the CM and DM components of a signal on a usual two channel scope. The reason for this to be able to verify whether a noise superimposed on a signal is CM orDM. Regarding my ...
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2answers
39 views

A question about oscilloscope and common mode noise

To ask this question I needed to simulate two circuits as an example. Imagine we want to measure the voltage across a device output. Call the differential voltage across its terminals Vd. And imagine ...
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0answers
63 views

How do I capture past the visible area on the Rigol DS1054Z oscilloscope?

I'm using a Rigol scope in single-shot mode to capture a signal but it only captures the amount of signal that is visible on the screen. This results in a lot of zooming out to capture and zooming ...
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3answers
820 views

How the low inductance of short ground clip probes prevents interference?

Below are photos of two scope probes with different ground clip lengths: I have read that the shorter ground is used to minimize the inductance of the probe ground lead. But what does that help for? ...
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0answers
49 views

Is it possible to tell the frequency of the noise in this case?

I have a scope screen shot from a while ago and Im not able to generate another test. What can we say about the frequency of the ringing pulse noise by looking at this scope screen?
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0answers
43 views

LVDS driver signals measurement

This is background: I have a self-made PCB, which is used to connect the camera via the CameraLink interface. When I connected everything together, it turns out that the camera is signalling me via ...
4
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1answer
62 views

Is probe compensation of a scope only for 10X setting?

I can understand that the idea of probe compensation is to make the sensed signal to be frequency independent as shown below 9C * R = R * 9C: Does that mean that probe compensation should be done ...
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3answers
74 views

Oscilloscope averaging and standard quantum limit

Oscilloscopes give a Vrms noise and have a noise floor, but if I average for a long time to infinity, am I at the standard quantum limit and does SNR keep improving with the sqrt(N averages) forever?
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3answers
68 views

Oscilloscope Run/Stop output signal

Hi, guys. Does anyone know what causes the multiple waves at a time when you run the oscilloscope? But when you stop (pause) the oscilloscope, you get one wave a time (picture on the answer column). ...
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4answers
68 views

Oscilloscope coupling and effects on the measured signal

I have a basic understanding of the of coupling settings on an oscilloscope, but I need some help to understand what I am seeing on scope. I have a signal generator, with an arbitrary function set, a ...
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2answers
75 views

High pass filter is not resulting as good as the scope's AC coupling

I'm generating sine waves by using a micro-controller and DDS module. The output sine normally swings always positive between 0 to around 1V. But I want to generate a real alternating sine with ...
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1answer
69 views

Is it safe to measure 220Vrms@50Hz on DSO directly?

I borrowed my friend's DSO to complete my project(Hantek DSO5072), but on scope it says CAT II/400V. So is it safe to measure 220Vrms@50Hz with it?
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0answers
47 views

About measurement of pulse using oscilloscope [duplicate]

When I measured the optical pulse using photo-detector and oscilloscope, some negative voltage was measured after strong peak. What did I get negative voltage? How is it possible?
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2answers
106 views

Oscilloscope: when to use coaxial instead of probes?

I understand the difference between passive and active probes, and between x1, x10, x100, ... I also understand that at high frequencies the capacitance of the oscilloscope has to be considered, so a ...
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1answer
53 views

What's the source of this noise in my Arduino oscillator?

I've been experimenting with techniques to rapidly switch on and off the digital output pins in an Arduino. This is the code I use: ...
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3answers
67 views

Can I use the external trigger to simultaneous capture waveforms on two oscilloscopes?

I want to look at synchronization in a 6 oscillator network (oscillators are about 100 kHz, 1.5 V_pp, if this matters). I have a 4 channel oscilloscope (Tektronix TDS 2024B) and a 2 channel ...
1
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1answer
101 views

Inverting, single-supply comparator not working as expected

I am trying to convert an input sine wave to a square wave. The sine wave is centered at 2.5V and has an amplitude of 2V, with a frequency of 100kHz. I am looking for a hysteresis of 100mV centered ...
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1answer
50 views

Measuring pwm output from low side FET with oscilloscope

I have a n channel MOSFET controlling a high current LED panel. The FET is driven by a FET driver, which is itself driven by a MCU pin. I am using PWM to control the LED brightness. I want to double ...
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2answers
51 views

Matlab Three Phase System Model

I have a question regarding MATLAB Simulink if anyone is familiar with the software. I usually have no problems creating basic models like this one below: I know the image is rather small. It is ...
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0answers
41 views

Reading from Keysight Scope to MATLAB

I have a DSO-S 104A scope. I have it connected through a USB 3.0 cable to a PC with MATLAB. I want MATLAB to read the waveform from the scope into a vector. I'm sampling packets of pulses, the ...
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1answer
83 views

Understanding Audio Amplification with OpAmp

I have what I believe to be a fairly simple schematic, as shown below, to take either a PWM signal from an AVR board to play a song/alarm, or radio signal. I'm connecting both of these with a ...
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1answer
90 views

60 Hz signal between thumb and forefinger? [duplicate]

I was playing around with the oscilloscope and noticed when I measure between two points on my hand, I see about a 1 V signal at about 60 Hz. Do I oscillate at 60 Hz? Does this have anything to do ...
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1answer
64 views

RCD tripped when measuring with a scope

Below was my setup: The moment I connected the probe the RCD tripped. My scope was earth grounded. Does that mean I shorted the neutral and the earth ground? I know that neutral and earth are ...
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1answer
47 views

Acceptable Buck Converter Output

I've just put together my first busk converter with a LMR16006Y-Q1. http://www.ti.com/lit/ds/symlink/lmr16006y-q1.pdf Here is what it looks like on the scope. The Pink signal is unloaded, the other ...
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1answer
133 views

What is the proper name for this oscilloscope probe accessory?

These used to come standard in the accessory pack that comes with a new o'scope probe, but they haven't been included in quite some time. They are very useful for checking certain test points, and we ...
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1answer
67 views

Testing Capacitor in PWM Circuit with Oscilloscope Calibration Signal

I'd like to measure the effect of a capacitor in a PWM circuit with an oscilloscope. The capacitor is engaged on a switch connected to a DC motor. Can I hook the motor up to the 1 kHz calibration ...
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1answer
75 views

Why does this “square wave” have what seems to be a charging action on it's leading edge?

I'm trying to produce a basic square wave output across a resistor from an ATMega328P Xplained mini. VCC is 5 V. Setup: Code: (Stuff with DDC/PORTB is just to control the onboard LED) ...
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4answers
140 views

How would I use an oscilloscope to measure sound signals? [closed]

I want to detect an audio frequency, something about 10 kHz in order to observe the doppler effect. How would I do it? Do you guys have any recommended reading about it?
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1answer
53 views

How to know voltage used on a data bus?

How do you find out what voltage is being used on a data bus for the high signal? On a small electronics I guess you can assume it will be 3.3v or 5v but what about other circuits, say in a car or on ...
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0answers
28 views

Probe at low current load to measure voltage using oscilloscope

I have a circuit with a load where i'm measuring the current across the load with an ammeter and the typical current consumption of the load is typically within 10uA range. When I connect my ...
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0answers
50 views

Oscillation of a certain device

Let's imagine that we have a device, for example a power supply. Let's imagine that we are powering a certain load at a certain output voltage. For example we power a 7.3A load at 26.4V. If I connect ...
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1answer
58 views

How do I connect an oscilloscope to a power supply or function gen.?

I'm supposed to sketch a circuit for my class but the one thing that has me completely confused is the ground connection. For example: I have a breadboard with a 10V dc power supply and two ...
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2answers
311 views

Disconnecting ATX PSU's ground from mains earth to protect my oscilloscope

Like many I took an ATX PSU, hooked green to black, and have a nice PSU. I am experimenting with a HP oscilloscope from 1997 and as you know, those are grounded to main's earth, just like my ATX PSU. ...
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1answer
93 views

A x10 oscilloscope probe means that the voltage is attenuated 10 times?

I have a digital little oscilloscope that can handle up to 35 [V] in the input. As far as I know, we use x10 probes for high frequency circuits and that stuff but my doubt: if I have a x10 probe, ...