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

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3answers
73 views

Debugging when oscilloscope grounds cures the problem

In a nutshell : My circuit behaves erratically I connect the 'scope to find out why The problem disappears In particular, this concerns the circuit in my last question although this is not ...
0
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0answers
22 views

Specs for the 54622D oscilloscope expansion bus

Just bought a used HP/Agilent/Keysight 54622D oscilloscope. There is an expansion bus connector on the back. I've been looking around for the specs on the bus such as connector type, electrical ...
0
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2answers
104 views

RIGOL Oscilloscope timescale “bug”

I assume this an already known "bug" but I'm unsure if this could be fixed or not. Straight to the problem: I feed my RIGOL DS1054Z a 20MHz sinusoidal waveform and set the timescale to 200ms/div. ...
6
votes
1answer
154 views

Why does my PWM amplitude vary with duty cycle?

I'm controlling a 4-pin PWM fan from a 5V PIC and before going too far I'll say that everything is working fine but I'm just not understanding what I'm seeing on my scope. The fan has a 12V supply ...
2
votes
1answer
71 views

Arduino Uno - Analogue Signal Conversion Issues

The output of my Low Noise amplifier is a rough sinewave with a peak-to-peak of 1.7V and is shown in the oscilloscope trace below. I would like to use one of the analog pins on the Uno to perform ...
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2answers
30 views

Unexpected output from astable multivibrator?

After following an answer to a question I asked here I created this circuit... simulate this circuit – Schematic created using CircuitLab This is the output on either of the ...
0
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2answers
99 views

Oscilloscope measuring current that flows a few milliseconds

Is it possible to measure current that is flowing for 2 or 3 milliseconds inside a circuit through oscilloscope by measuring the voltage drop across a resistor ? The supply voltage is generated by ...
0
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1answer
48 views

Why does oscilloscope show large amplitude when I touch the probe?

When I touch the probe I see a 50Hz sine wave with an amplitude of about 100V from peak to peak. I understand that 50Hz is the mains hum picked up through my body, which acts as an antenna, but where ...
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2answers
38 views

Eye diagram measurement of a CLK using an Oscilliscope

I'm still a junior engineer and wondering how to perform eye diagram measurement of a CLK using an Oscilliscope? My second question: Is the eye diagrams just using to measure CLKs, or one may also ...
0
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3answers
53 views

AC vs DC Measurement using an Oscilloscope of a half-wave rectifier

This question is a follow up to a previous question found here. As a follow up question: for a half-wave rectifier, what is the "AC" voltage and how do you measure it? Additionally, What is the DC ...
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3answers
81 views

AC vs DC on an Oscilloscope

I am looking at an oscilloscope (LG 3040D) that is connected to the output a half-wave rectifier. The input of the half wave rectifier is a 20Vpp at 60Hz, a stepped down voltage from the wall. I know ...
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1answer
60 views

Can I get help with measuring particle charge using oscilloscope?

How can one measure particle charge using oscilloscope and op amp integrator circuit along with a capacitor and faraday cup. I am unable to figure out how to approach. I have the circuit ready but ...
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2answers
44 views

Oscilloscope input impedance when using a preamplifier

I am currently measuring the power consumption from a SoC. With the aim of reducing quantization noise due to the small amplitude of the signal (less than mV), I am connecting a R&S HZ-16 ...
1
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1answer
48 views

Function generator changes output amplitude when connected to resonant inductive coupling circuit

I have the following circuit on a breadboard connected to a RiGOL DG1022 function generator as the input voltage source (V1). (R1 is supposed to model the resistance of the function generator and is ...
3
votes
2answers
98 views

How come the decoder gives a question mark?

I'm using a scope to debug I2C (bit banging) by letting it capture the signal. I think that the output should be good, but the scope's decoder gives the following: where there is a question mark ...
0
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1answer
37 views

Analogue oscilloscope probe selection

Recently, I have bought an oscilloscope with model Panasonic VP-5512A Panasonic VP-5512A 100 MHz 2CH+1/2+1/2 Dual Timebase It is an analog oscilloscope. ...
4
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2answers
423 views

Are there downsides to using resistors with too high power ratings?

I'm hoping to measure the current draw to my ESP8266 with a scope and a shunt resistor. I think a 1ohm resistor might drop the voltage too much, so I'm thinking to use a 0.5ohm (or even a 0.1ohm) ...
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0answers
41 views

pc-based oscilloscope input voltage range

I have heard that PC-based oscilloscopes have limitations for their input voltage range compared to "real" ones. I would like to know, where does this limitation comes from? Prob or enterance of ...
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0answers
52 views

Oscilloscope ground connection causing increase in current used

I did try to search for an answer, but may not know the correct terminology. Situation: Custom designed circuit board V-Reg 25V -> 3v3 + uC, LED's, POT, etc Powered by Tenma 72-8335 Power Supply ...
0
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1answer
27 views

Drop on high pass filter measure

So I'm implementing an analog control scheme, and one important component is a first-order high pass filter. The source signal is the output of a shunt monitor (INA138 - in the circuit below the ...
0
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1answer
50 views

Thevenin equivalent of simple circuit

I'm stuck on a problem and I don't know how to proceed. I have a circuit that consists of a 10μF capacitor connected in series with a variable resistor (100kΩ, 200kΩ, 300kΩ). I'm supposed to draw the ...
0
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0answers
23 views

Measurement of 230VAC relay noise

I have an MCU which is switching a load, which is connected to 230VAC via a two pole relay switching live and neutral. The load is another MCU board with its own ACDC. My problem is that when the ...
0
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1answer
45 views

How to view pre-trigger data on digital scope (Owon SDS-7102)

Noob oscilloscope user here. I want to view the voltage rise on my oscilloscope when I connect a device to a 1.5VDC power source, to see how clean the connection is - i.e. how many times the voltage ...
0
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1answer
44 views

Noise spike on microphone amplification circuit

I'm trying to build an electret mic amplification circuit. I see some weird spikes by just connecting the microphone like so: ...
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1answer
52 views

Why is mains voltage showing up on my oscilloscope from MagSafe shield?

I'm theoretically aware of grounding issues that can come up when using an oscilloscope [e.g. as explained in this video], but I can't make sense of this one: I have a device under test (imagine an ...
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1answer
58 views

Troubleshooting a soundcard oscilloscope that doesn't appear to affect the computer

I'm attempting to build a soundcard oscilloscope, but my computer doesn't seem to be reading the voltage on the audio jack plugged into it. I'm using an Acer laptop (product ID ...
1
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2answers
112 views

Why use ground in oscilloscopes and what's the difference between it and a volte meter?

I am a high school student And we lately started studying rc and rl circuits And my questions are What is the difference between volte meter and the scope? Why we use the ground as reference in the ...
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2answers
59 views

Measuring the dampening sinusoidal wave of a simple LC Tank circuit?

I've been trying to do the simplest of things...measure the decaying sinusoidal wave of a LC Tank circuit on a breadboard. I've created an "inductor" out of a coil of copper wire I wrapped around a ...
0
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0answers
43 views

Oscilloscope for Cell Phone Memory Chips

I will start by saying I am in no way an electrical engineer. I do digital forensics mostly on mobile devices and I am trying to come up with a solution for my need. My brother has more knowledge in ...
0
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1answer
133 views

Why modern oscilloscopes use hardware triggering?

I've been learning how DSOs work for the past few days. As far as I understand, digital storage oscilloscopes have trigger circuitry, which usually consists of an analog comparator and a DAC. A ...
4
votes
1answer
100 views

How to measure self resonance frequency of coil using CRO?

I have antenna coil for tuning an antenna. I want to measure self resonant frequency of the antenna coil. Can anyone tell me how to measure it with an oscilloscope? What will be the experimental ...
0
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3answers
173 views

Can reading VGA signals from my computer harm the hardware?

I was really hoping to be able to get (or make) a Y type VGA cable with two outputs and one input. The input would be coming from my desktops graphics card (specifically an R9 270). One output would ...
2
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1answer
52 views

Ground Plane Noise?

I have some noise issues on a PCB that I am having a hard time troubleshooting. Below are pictures of the schematic as well as 2 scope traces. The first trace shows the amplified signal with the noise ...
2
votes
1answer
34 views

Measure propagation velocity through finite transmission line

I'm currently trying generate a wave in a circuit but am running into the issue of figuring out exactly how to measure the propagation velocity. The circuit diagram is below L1=L2=L3, C1=C2=C3, ...
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0answers
49 views

Multiple Oscilloscope measurement in Multisim with small Variance

I have a design that consists of several stages, it's Dual DC Regulated DC power supply, using transformer, bridge rectifier, capacitor filter and regulator. We add the components one by one and each ...
0
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0answers
42 views

Oscilloscope Tektronic MDO 3034 Digital and Analog channel synchronization issue

My oscilloscope becomes really slow whenever I measure (direction and steps) digital signals from two stepper motors. This slowliness happens after I "zoom out" on my oscilloscope (e.g., make the ...
2
votes
2answers
68 views

How does an electron beam move in XY mode?

I was recently observing some Lissajous figures on an analog scope in XY mode . I was wondering how does the electron beam move . I know it should move from left to right but I find it difficult to ...
0
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1answer
90 views

Test 220V 50 Hz signal using oscilloscope [duplicate]

Can I test a direct electric signal wave AC 220V 50 HZ using an oscilloscope in safe mode and the schema for this testing. The description in my oscilloscope say that the input AC pk and DC is Max ...
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votes
1answer
93 views

AVR BASED USB OSCILLOSCOPE [closed]

I want to create a simple oscilloscope that uses an AVR microcontroller to take the input and provides the data to the computer through the USB port. The data is to be analysed by the computer. Can ...
1
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1answer
43 views

Stray Capacitance in my load waveform?

I have just taken this trace of my Loadwave form for PWM controlled halogen dimmer. I was wondering if anyone could identify the cause of the transients below or above zero volts for each polarity. ...
6
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3answers
919 views

First checks after oscilloscope unboxing

You bought your first entry level oscilloscope (e.g. Rigol DS1004Z series, 4 Channels, 50-100MHz, 1Gs/s) and while it is slowly warming up to room temperature you are wondering if the unit you have is ...
13
votes
4answers
378 views

About Oscilloscope Probing Philosophy

Recently, I read Tektronix's Probe Bandwidth Calculations. It point out that Tektronix and Agilent have different probing philosophy: There are two schools of thought on what an oscilloscope probe ...
5
votes
4answers
744 views

Audio signal trying to go back to zero zeroes

I created a two differrent signals on my android phone, one to act as the clock signal (lower signal), and the other to be the data signal (lower signal), but the problem is that the audio the signal ...
1
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1answer
83 views

What happened to my second half cycle of my half wave rectifier?

When I'm doing a simple half-wave rectifier with the set-up as shown above (Note: Diode D2 is not connected) and connected terminal 5 and 4 with positive and negative terminal of oscilloscope, this ...
1
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1answer
82 views

How to use an oscilloscope with a function generator?

I am taking a digital electronics class and I am utterly confused. I am using Multisim to design circuits, and for one of my labs I had to use a function generator with a oscilloscope. Here is a ...
1
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1answer
120 views

Question about op amp DC offset [closed]

I need help explaining why I am getting such a large DC offset across the output for my op amp. I am using an OPA548 to amplify an AC signal and then drive a solenoid shaker. I have the circuit ...
0
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3answers
114 views

Amplifying a 100mV range (sinosoidal wave) to a range of 0 - 3.3V for the Arduino

I have a partial discharge wave form which varies between -100mV to +100mV. For simplification, I am using a sinusoidal wave with that range. I need to amplify and bias this signal between the range ...
1
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2answers
92 views

Oscilloscope Output with its positive terminal touching human's body and negative terminal left open

it once happened that when I touched the positive terminal of the Oscilloscope input probes letting its negative terminal open, I observed sinusoidal voltage signals with 0.5V peak to peak and of ...
3
votes
1answer
410 views

Using oscilloscope to measure voltage across a resistor

I have a board which is powered by a 5V PSU. I needed to measure the current flowing into the processor for computing power. Since there was no resistor that I could find in the path from the supply ...
0
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1answer
110 views

AC->DC Power supply ground and probing

I'm learning electronics and I have an old C64 power supply which was made at our local electrical shop back in the 80s. I'm taking a look at it to try and understand how it works. What I don't ...