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

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41 views

IR photodiode doesn't show 38kHz carrier wave on oscilloscope

I have an IR photodiode, part number PDB-C134F, as shown here. I'm trying to use it to retransmit a remote control signal that uses a carrier frequency of 38 to 40kHz. However, when I connect the ...
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1answer
17 views

Can DSO Nano V3 (BenF Firmware) measure AC 350v? [on hold]

DSO Nano v3 with BenF Firmware. Can this device measure AC volt safely? Does it have shutdown/disconnect capability when volt is above its measuring capacity? Thank you so much in advance for your ...
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1answer
56 views

Oscilloscope Repair - Heathkit

I found a great deal on an old Heathkit I0-12 at an auction the other day and decided it would make for a fun project. The unit looks awesome and could probably survive a bomb blast. When I got home, ...
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4answers
78 views

Oscilloscope reading human body [duplicate]

When I touch with my bare finger the oscilloscope probe I get a perfect sine ac wave 155V peak to peak!. This is my first oscilloscope and I don't know if this is a normal glitch. Do I have a faulty ...
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1answer
40 views

Type 453 Oscilloscope

I am a senor in High School with an ETA certification. So i am on a tight budget. I was wondering if a Type 453 Oscilloscope would be worth to buy if i can score it cheap. As for what I would be using ...
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1answer
105 views

HDMI Port damaged with oscilloscope?

I tried to measure some HDMI signals (the TMDS Clock) from my PS4 with a keysight MSOX3104A Oscilloscope. After my "measurement" the PS4 did not send any HDMI signal to the connected TV. Multiple soft ...
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0answers
28 views

Measuring the frequency of motor vibration

I'm using a motor from Adafruit. (Product page link: https://www.adafruit.com/product/1201) I measured the frequency of vibration with different voltages, but the frequencies are quite different from ...
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2answers
84 views

what is serial triggering in oscilloscopes? Why was it available only in the higher end models in the beginning?

what is serial triggering in oscilloscopes? Why was it available only in the higher end models in the beginning?
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2answers
88 views

Getting negative voltage reading when negative voltage does not exist. Why?

I am beginner trying to make sense of some weird voltage readings I am getting. Please take a minute to look at the circuit below: If I take my oscilloscope and capture the voltage activity across ...
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0answers
20 views

Waverunner 610zi Serial decode

I'm using a LeeCroy WaveRunner 610zi to get the signals from a SPI flash, that contains the BIOS, and the CPU. The waveforms that I get are clean and the noise is acceptable. The WaveRunner has ...
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2answers
68 views

Is it possible to measure a 433MHz RF Transceiver signal using a 100MHz Oscilloscope? At least to see if it is transmitting or not

I'm generating a serial signal and feeding it to a 433MHz RF Transceiver and I want to know if the signal is at least being transported before I starting working on the receiving end.
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3answers
55 views

How to measure temporary drop in voltage with meter

What's the easiest way to measure the period of time between the "peaks" when a 5V DC signal goes from high to low to high? I'm trying to debug a power-loss problem, and one of the solutions I'm ...
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1answer
52 views

How can I cause my oscilloscope to trig on interruption of AC voltage?

I'm probing a point with 230V RMS voltage inside a machine (don't worry, I'm using a 100:1 CAT 3 probe rated at 600V), and would like to trigger my oscilloscope at the point when this signal is ...
2
votes
1answer
85 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 ...
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0answers
56 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
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3answers
941 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 ...
2
votes
1answer
89 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 ...
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1answer
73 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?
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3answers
131 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 ...
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0answers
24 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 ...
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2answers
132 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
191 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
84 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
44 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 ...
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2answers
163 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 ...
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1answer
59 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
46 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 ...
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3answers
93 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
158 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
65 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
48 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
90 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
107 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 ...
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1answer
50 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
454 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
63 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
72 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
29 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
57 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 ...
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0answers
31 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
69 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
52 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
77 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
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1answer
69 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 ...
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2answers
119 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
65 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
48 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
150 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
160 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
353 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 ...