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Questions tagged [oscilloscope]

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

2
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1answer
64 views

How to setup the oscilloscope for measuring power supply response

I need to measure the overshoot and to modify some capacitor values in the feedback loop of the operational amplifiers in order to find the best response of the power supply (it's a linear power ...
0
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1answer
50 views

Using CD4093 as Schmitt trigger oscillator. How to measure high and low trigger thresholds?

Based on the suggestion of answerer in another post (this one: Adding Diodes to Transistor Astable Multivibrator; 1N5818 Schottky diodes work but 1N4148 diodes don't; can't figure out why), I ...
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4answers
161 views

What is USB port on oscilloscope is for ? Can I power my Arduino from it? [closed]

I have a DS1102e oscilloscope (by Rigol,) picture attached below. I'm new to oscilloscopes and watched plenty of tutorials on how to use them, but I couldn't find the answer to my question. I need ...
0
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0answers
44 views

Why cant I get clear wave?

I'm trying to find a good stepper driver with low vibrations and low noise. So, I observed wave form between current sensing resistor of few stepper driver using my oscilloscope. The voltage between ...
2
votes
1answer
53 views

voltage traces across pwm driven dc-motor: is that ok?

I'm driving a dc-motor with a BJT turned on and off with a 555 generated PWM signal. Here's the circuit (V1, Rl and L1 simulate the motor): There actual circuit - same parts - is on a breadboard and ...
1
vote
1answer
96 views

Proper oscilloscope connection to prevent ground looping

I have a question about proper oscilloscope connection for doing work on vintage stereo equipment (120v AC input to +-76v DC board voltage). Our house wiring is a 1950’s 2 wire system with no ground ...
0
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1answer
28 views

Resolution of FRR Function

I am working with a oscilloscope GWINSTEK gds-2074a. As per the time resolution is concerned, turning the dial all the way down, it shows that it can go down to 1 ns. There is a Delay function in the ...
1
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0answers
53 views

Wrong measurement of DSO-5200A?

I'm using a DSO-5200A from Voltcraft and noticed the voltage measurement represented incorrectly (it is doubled). Any ideas how to reset this? Channel 1 (green) measures a (noisy) 5V and has a Vmean ...
0
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0answers
55 views

How to eliminate oscilloscope channel DC bias

When I set channel 1 as DC coupling, there is always -5.6v bias, even no cable is connected. Can someone tell me how can I eliminate this bias? Thank you
0
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3answers
99 views

Why do some oscilloscopes have several input channels?

Just was thinking to buy an oscilloscope, thus went to a shop and started to rummage all of the shops to buy an osci. which could be suitable for me. Read specifications of them. Some features was ...
1
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2answers
66 views

Oscilloscope probe pF values

I bought some time ago a 2nd hand Philips PM 3253 including probes which shows on the oscilloscope probe inputs: 1 MOhm, 20 pF While the probes I got with it ...
1
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1answer
68 views

Prevent oscilloscope scrolling

Background I already have a (2nd hand) Philips PM 3253 oscilloscope. Although it has many features and is fast (50 MHz) the display is so bad, it's barely usable. Therefore I bought another (2nd ...
2
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1answer
99 views

Overshoots and ringing…Do I need to compensate my probes or is it bad line termination?

When working with my DSO (Rigol DS2072A) I recently observed that signals have overshoots and showed some ringing as in the image below (it's a 2 MHz digital signal, SPI from a µC). I use the 10:1 ...
2
votes
1answer
175 views

How to save a bit sequence from oscilloscope?

I'm using two wires to communicate between devices. First wire is a clock, second is a data bit. Logic is simple: master device (AVR ATMega in my case) sets a value on the data pin, then raise "1" on ...
0
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1answer
58 views

Oscilloscope&function generator, opposite slope traced than trigger slope settings

I am wondering why the signal that was traced on my oscilloscope started on a negative slope when the trigger slope = rising. I externally triggered the oscilloscope by the TTL/CMOS output of a ...
0
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1answer
100 views

Oscilloscope Probe - How to measure a sensitive circuit

Help needed in measuring a tiny piezo actuator. The circuit bangs the actuator with a voltage ( max 50V ), then senses the ripples after the initial actuation. How can I measure with an oscilloscope ...
0
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0answers
22 views

Effect of impedance mismatch on phase of the signal

The effect of impedance mismatch on voltage measurement is known but is it possible for impedance mismatch between a oscilloscope and function generator to cause a phase difference? In my setup I have ...
-1
votes
1answer
50 views

LED output with Photodiode and Function Generator

Some of my student and I are designing a Physics experiment involving a high power LED, a square wave from function generator (50 ohm output impedance) and a digital oscilloscope (1 MOhm imput ...
1
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1answer
46 views

Differences in voltage measurement at the input of a circuit

I am trying to understand the difference I am seeing in voltage signals, that I am applying to my circuit's input. So the basic layout is shown in the diagram, I have a connection, A from my function ...
-1
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1answer
53 views

Oscilloscope and probes [closed]

What effect , if any, has using a x10 probe on: Voltage reading of oscilloscope with resistance box set to zero ohm? Voltage reading of oscilloscope with the resistance box set to 900k Ohm? And what ...
0
votes
1answer
31 views

USB disconnection when using differential probe

I have a simple setup described here : Laptop is battery powered. It communicates with DUT over USB. DUT is powered from switch power suppy. DUT earth / GND resistor = 1M Differential probe ...
0
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4answers
98 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 ...
1
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1answer
79 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 ...
0
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2answers
102 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 ...
3
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3answers
96 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 ...
1
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1answer
46 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 ...
0
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1answer
55 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 ...
0
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0answers
31 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 ...
0
votes
1answer
46 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
143 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!
0
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1answer
74 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 ...
3
votes
2answers
98 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 ...
1
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1answer
81 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 ...
1
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0answers
106 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 ...
1
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1answer
94 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 ...
0
votes
1answer
81 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 ...
1
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0answers
37 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 ...
0
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2answers
47 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 ...
0
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0answers
71 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 ...
8
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3answers
895 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
51 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
77 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
votes
1answer
98 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 ...
2
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3answers
80 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
82 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). ...
0
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4answers
73 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 ...
0
votes
2answers
82 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 ...
0
votes
1answer
122 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?
3
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2answers
124 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 ...