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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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30 views

Minimum and Maximum voltages in CRO

I’m generating an AC signal of frequency 1kHz, amplitude-870mV, offset voltage- 440 mV and given to oscilloscope (Division_1V.) In the oscilloscope, the maximum voltage is 1.84 (it is fluctuating ...
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40 views

ac/dc coupling and DC offset to read DC voltage in analog oscilloscope

A function generator is connected to an analog oscilloscope. I can see a sine wave. Can I read DC voltage with the help of DC offset knob? If so, can the minimum DC voltage be negative?
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109 views

Spikes on a square wave of a oscilloscope reading

This question is not really a problem i am having but a thought that want to get off my mind. Usually on a reading on a oscilloscope especially on a square wave and sometime triangle waves, there are ...
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41 views

Oscilloscopes and Packed Two-Layer PCB boards? (“Operating Table” PCBs)

I have recently completed a very complicated 2-layer circuit board. Every square mm has a component in it, two of the sides undergo edge plating, and one is riddled with right-angled connectors. I ...
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63 views

How to make sense of the signal trace of differential signal

I am trying to understand following signal trace picture that is shown on the wiki page of 1553 Bus. The Bus has balanced differential pair wires. As the 1553 bus has differential signals on the ...
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Fixing old CRT oscilloscopes… what to look for first?

I've been amassing a pretty large collection of these old scopes, and it's about time I got to trying to fix them. About half of the ones I run across and buy don't have traces. I don't need to get ...
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78 views

What could be the reason for this flickering of this periodic pulse train?

I try to create periodic pulse train for the clock signal in application. I use an arduino nano board. But I noticed in scopes I see flickering pulse train behaviour. It is very hard to explain this ...
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110 views

Oscilloscope scrolling

This questions is kind of related to this: Prevent oscilloscope scrolling However, now I have a decent signal generator (well still budget, but for my needs more than enough, FeelElec FY6900, 60 MHz ...
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1answer
20 views

monitor tp4056 charge current on a scope

I assembled a li-on charger with the TP4056 module as I've repaired a few solar lights for friends and a lot of the times the batteries are just low. Recently I purchased an Oscilloscope to use with ...
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50 views

Why connecting oscilloscope reduces noise [duplicate]

I am doing a speaker driver circuit. When I connect the oscilloscope probe to the output (emitters of npn/pnp complementaries) to where also the speaker is connected; the sound of speaker and the ...
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2k views

Understanding capacitance in oscilloscope probe tip

I am trying to understand the capacitance and resistance in oscilloscope probe tip. In the above attached image, that 9Mohm resistance is used for that 1x and 10x setting that divides the input ...
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1answer
58 views

FFT in oscilloscope measuring Frequency spectrum

I am using a Keysight InfiniiVision MSOX3054T Scope having Bandwidth of 500MHz and Sampling rate of 5Gsa/s. I am learning to use the FFT Option in the scope. Below is the waveform I captured of my ...
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75 views

Understanding low current measurement

I'm trying to understand a current measurement of a hobby project. This project consists of several ICs and is battery operated. At a certain mode (deep sleep) it should consume a very low current, ...
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40 views

Measuring Power to Load Using Oscilloscope

I have a small three-phase motor being mechanically driven to act as a generator. My goal is to measure power delivered to a load, which in my case would simply be a 4 ohm resistor, using an ...
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56 views

Confusion about sampling rate of a scope and its bandwidth [duplicate]

In sampling theory the BW is determined by the half of the sampling rate. But in a scope things seems to be different if I'm not mistaken. But for example if you look at the front panel of the ...
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21 views

Tektronix MSO4104B oscilloscope SCPI command to add a measurement

I have searched the programmer's manual in vain. I can configure measurements if already on-screen but cannot figure how to add measurements if not present. Does anyone know the correct command?
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700 views

Why so few osilloscope with dedicated isolated channels?

Background: I am a junior engineer who work with testing and designing inverters for motors. I have been looking at a new oscilloscope since the one I had gave up. There are alot of Tektronix TPS2024b ...
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47 views

Ground Antenna Madness?

When I hold my oscilloscope probe and ground clip out in the air, I get a noisy ripple with a predictable pattern. Nothing unusual here. When I touch the tip of the probe to the ground clip, I get a ...
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1answer
50 views

Measuring Output Ripple Voltage

Please check the below waveform of my 5V output ripple of the buck converter. I am measuring the output ripple across the output capacitor of the converter. Why are these spikes coming while ...
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4answers
140 views

Waveform for one byte sent over 3.3 V TTL

I have this question in my lab which I am not able to solve. It would be really appreciated if I could get some help with this. The question is: I need to draw the waveform for 1 byte sent over 3.3&...
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31 views

Will using magnetic base test indicators with breadboards cause electrical interference?

The situation leading to the question In the Quick Tips #8 // Precision Helping Hands YouTube Video, a "helping hands" with various names such as "Magnetic Base Adjustable Metal Test Indicator Holder"...
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40 views

Measuring output voltage (Single ended probe vs differential ended probe)

I have a SMPS buck 3.3V output. I am trying to measure the output voltage at the output capcacitor using Oscilloscope. I am using a single ended probe with spring ground tip to measure the output ...
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42 views

Current probe settings and measurement

I am having this Current probe I am using this to measure the inductor peak current. Inductor is rated at 2.05A. Schematics : Input Voltage to the converter during measurement is 7.5V I am ...
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1k views

How this DIY High-Speed Probe doesn't reflect signals?

I am reading The Art of Electronics, page 809 and 810, where they show this probe: Which is a DIY probe, made out of a RG-178 coaxial cable, in series with a 953 ohms resistor. I wonder why the 953 ...
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153 views

What causes my mcu to blow up when hooking up with oscilloscope?

I was observing some timer signals yesterday, earlier in the morning I had my oscilloscope on another lab workbench where I would first make some changes, reflash the board and then take it to that ...
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27 views

Why is the trace on my DSO displaying faintly (too light) at longer sweep rates?

I am using a Rigol DS2102 (DS2000 series) DSO to monitor clock output on a microcontroller. For whatever reason, the trace intensity becomes very faint at 200ms/division sweep rates and longer. I've ...
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37 views

HV probe to CRT oscilloscope?

Can you guys tell me if it's okay to hook up my HV prove to my CRT oscilloscopes? And what about a multimeter, what kind of precautions do I need to take with using that? I read somewhere that it's ...
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71 views

Maximum Input voltage of the DSO shell oscilloscope and TL084

In jyetech forum FAQ they mentioned that DSO shell is capable of measuring up to 50V directly: DSO Shell was designed for low voltage measurement. The maximum input voltage was specified as 50Vpk ...
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34 views

How to chek if my Tektronix 465M is working properly

Purchased a Tektronix 465M at eBay used and seems to work but how do I ensure is it working properly with all functions? I do not have the calibration "wire" and have only one probe x1 that seems to ...
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123 views

Relay inside oscilloscope (Relay vs other switches)

When I press the "Auto" button on my scope, I can hear the sound of a relay switching (several relays or single relay switching many times.) What are the relays doing?
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108 views

High-Voltage Pulse Measurement Using Just Resistors for oscilloscope measurment

I would like to measure a High-Voltage pulse (20kV) with a duration of a few tens of nanoseconds using an oscilloscope and a simple 1000:1 Resistor Voltage divider. Is it possible to do this without ...
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87 views

Why measuring a differential signal requires a differential probe?

I am planning to measure an RS485 signal with an oscilloscope. Since I want to see the signal that is "seen" by the receiver side, I was planning to plug the reference terminal of probe to Sig(-), and ...
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42 views

how to reduce signal noises

I am trying generate guided waves on simple metallic plate through piezo-ceramic material, I place two piezo on the surface of the plate at the different location and through Arbitrary pulse generator,...
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2k views

Power supply - purpose of the capacitor on the side of the transformer before full bridge rectifier

I was wondering if someone can explain the purpose of the capacitor C1141 from the attached picture. I know that C1142 is a filter cap: that much is obvious to me. However, I can't seem to grasp the ...
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ZMPT101B Voltage Module with Spikes in output Waveform

I am trying to use the ZMPT101B Voltage Module in order to measure AC Voltage .. I am trying to calibrate it, but when I see the output waveform in the oscilloscope, there are spikes all over the Sine ...
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45 views

Calculate closed loop gain with Oscilloscope measurements

Using these reading from Agilent MSO-X2012a oscilloscope: from this circuit: How do you calculate the close loop gain using these measurements. I already calculated by hand and got Av = 11V.
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53 views

Tektronix TDS3000 series max trigger rate

So I am making a testing stand for some equipment and I am using an old TDS3034C Tektronix scope for most of my measuring purposes. I've connected it to the computer via Ethernet and using PyVisa to ...
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274 views

Is there a practical method to verify whether the noise have CM component in this setup?

An SMPS power supply unit namely Vsupply output can be composed of its desired DC output Vdc, differential mode noise Vdm and common-mode noise Vcm. If we have such a power supply and an earth ...
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1answer
57 views

Is this way of measuring scope's minimum measurement capability correct?

In general Vertical sensitivity of the oscilloscopes are in 2mV to 10V/div range. Neglecting the noise contributions, if the scope has an 8-bit resolution and if I set the vertical sensitivity to 2mV ...
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118 views

What does Ch-Ch isolation stand for regarding this context?

This scope specs mention the following inputs: I don't understand what meant by channel to channel isolation here. I made a continuity test and the input grounds of two channels are connected. I ...
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47 views

Accurate signal reconstruction

While reading through this page I came across following info: "For accurate reconstruction using sin (x)/x interpolation, your oscilloscope should have a sample rate at least 2.5 times the highest ...
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Need help diagnosing oscilloscope results, newbie question about clock signals

I'm a newbie, and I don't fully understand the results my oscilloscope is giving me. I'm attempting to create a crystal oscillator circuit with a square wave. I've already generated a perfect 8MHz ...
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1answer
94 views

How to extract the switching noise component for this signal data?

A servo accelerometer when powered by batteries has a clean output, but when used with this SMPS supply its output seems like have switching artifacts from the power supply(the datasheet says its ...
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50 views

Viewing DVB-T signal on osciloscope

I am looking for a way to acquire a TV signal in order to demodulate, decode, and display it. As a first step I thought of using a digital oscilloscope connected to an interior TV antenna in order to ...
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55 views

Parallel transformer output not expected RMS value

I have a 115V/230V transformer with specifications of: outputs 10V (parallel)/20V (series) and 1.2A (parallel)/600mA (series). Product I'm no electrical engineer, but I need to get this set up to ...
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1answer
129 views

Strange “step” in i2c plot [closed]

I have some errors during debugging I2C chip. I took an oscilloscope and found some strange artifacts on the log: Maybe somebody has a suggestion about such questions? 1. What are these strange ...
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1k views

Is it acceptable to use decoupling capacitor ground pad as ground for oscilloscope probe?

If one were to probe with an oscilloscope using the short ground spring clip attachment, and use the ground pad of a decoupling capacitor as the ground, would the measurement be thrown off at all by ...
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98 views

How could this circuit be reduced to first order low pass filter?

I was told that the bottom half of the circuit wouldn't matter due to having a corner frequency being significantly higher compared to the top half, or due to time constant (somewhere along this line.....
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63 views

Oscilloscope and Electrical Safety

I was reading an article in a magazine in which the following sentence is written about a circuit that generates a certain waveform on a load R (in which one of its terminals is connected to the earth ...
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76 views

PSD vs FFT of voltage magnitude squared and oscilloscopes

Imagine we have a time-domain signal which is a voltage signal. Now if we sample this at the correct rate, and taking the Fourier transform gives us the magnitudes of various frequency components ...