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

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2
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1answer
67 views

How to measure telephone DTMF tones with an oscilloscope?

I have a situation where I'm trying to connect two computers via their dial-up modems. I've built a line voltage simulator (9v @ 40ma) into the line that connects them, and I've tested with a ...
0
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0answers
33 views

Proteus Sine Current Source Simulation Issue

The circuit below is being simulated in proteus isis v7 Current Source has Amplitude value 5A (as asked by Proteus). Two Resistors of values 3 ohm each and then there are two AC voltmeters ...
7
votes
3answers
901 views

My “audio oscilloscope” can't measure static/constant voltages but only changes

I don't have a oscilloscope (costs so much) so I decided to make a "audio oscilloscope" It works great in many ways. When connecting a IR receiver module to the audio oscilloscope I can clearly see ...
-1
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0answers
24 views

Calculate internal resistance of Function Generator [on hold]

Can any body tell me how to find the internal resistance of the Function Generator using Oscilloscope ?
2
votes
1answer
77 views

Precautions for powering up an old oscilloscope?

I have a Phillips PM3264 100MHz 4 channel analogue oscilloscope, I have not powered it up in around 8 years. I have not been able to find a users manual, nor service manual as of yet, only a few pages ...
0
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1answer
71 views

Why does I2C look like this?

I'm trying to debug an I2C device, and the wave is looking really weird. Why is it curved?
2
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3answers
124 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
122 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
169 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
78 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 ...
0
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2answers
36 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
123 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
53 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 ...
0
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2answers
41 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
votes
3answers
71 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 ...
0
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3answers
101 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 ...
1
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1answer
61 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
45 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
vote
1answer
62 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
102 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
41 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
votes
2answers
435 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) ...
0
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0answers
51 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 ...
1
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0answers
69 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
votes
1answer
53 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
25 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
votes
1answer
58 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
45 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: ...
0
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1answer
55 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 ...
0
votes
1answer
64 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
116 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 ...
0
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2answers
63 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
47 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
votes
1answer
139 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
127 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
votes
3answers
244 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
votes
1answer
61 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
38 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, ...
0
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0answers
62 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
votes
0answers
44 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
70 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
votes
1answer
105 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 ...
-5
votes
1answer
107 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
vote
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
votes
3answers
923 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
395 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
746 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
90 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 ...