Questions tagged [oscilloscope]

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

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Why do we take 50 ohm resistance value for unit conversion in Spectrum View in the oscilloscopes?

While we change the unit in Spectrum View, why is it explicitly mentioned 50 ohm? Why don't we take the resistance value of 1 Mohm into account as well? Though we do have 1 Mohm as one of the ...
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Measuring PoE power consumption with an oscope: Is PoE Ethernet non-grounded?

I have a need for measuring current (and thus power) delivered via Power over Ethernet. I have created a modified Ethernet cable by splicing shunt resistors into it already, but I'm unsure about the ...
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Difference between open drain and push-pull modes

The figures show diagrams of line signals: the first in the open-drain + pull up mode, the second push-pull + pull-down. There are several questions: Why does a push pull output have a faster slope ...
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Beginner Electronics Hobbyist Q re: oscilloscopes and grounding

I'm in my infancy as regards electronics, but will soon be acquiring an O-scope as part of my learning plan. I'm at the stage (and will be for some time) where I'm building simple things on a ...
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Waveform acquired from scope, what is the sample rate for post processing?

I want to make a noise measurement with my scope, but I need it to be band-limited. I am using a Tektronix TBS1102, which allows me to save to a USB flash drive an Excel/CSV file with the X and Y ...
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Using two 2 channel oscilloscopes instead of one 4 channel oscilloscope

I have a measurement that needs 4 scope channels simultaneously, but I only have two identical 2 channel oscilloscopes. Is there a way that I can still do my measurement accurately?
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Weird PWM signal if powered by AC/DC source

I've developed a PWM LED strip dimmer equipped with a 230VAC to 5VDC converter and an ESP32 board (schematics below). If I hook up the oscilloscope to the input of the LED, the PWM signal shows weird ...
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Oscilloscope showing bars above and below actual voltage. Is it broken?

EDIT: performing a factory reset caused the problem to go away. Whenever I measure a voltage on my oscilloscope, I see two bars around where the actual voltage should be. This happens on any of the 4-...
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Total impedance of scope probe

I would like to measure the total impedance of the scope + 20:1 attenuator + x1 probe EDIT: Circuit modified according to Bruce Abbott's recommendation My scope's input impedance is : 1 MΩ ±1%, in ...
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Measuring capacitance with an oscilloscope and a function generator

I was looking for a method to measure capacitance at high frequencies and found this document from Tektronix. It shows how you can measure capacitance with an oscilloscope and a function generator. I ...
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How do I make these MIPI signals better?

I have a system which transmits 1 Gbps single lane MIPI video over several flex circuits. Where each flex circuit connects to its neighbour, I have placed a MIPI repeater chip: SNx5DPHY440SS. At the ...
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What is this oscilloscope accessory?

I have access to a FLUKE 190-504 SCOPEMETER oscilloscope. The following picture shows one of its probes. I don't know the circled accessory in the above picture. I ...
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Differential current sensor probe- Ground leakage current measurement probe for oscilloscope

I would like to know what you use to measure differential current which is also leakage current sensing. Background: In industry , the AC or DC current flowing from inverter/ converter needs to have ...
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Detect pauses in a digital signal on a scope?

I am currently using a USB-SPI converter and I would like to know if there are stutters caused by some buffer starvation or anything else, i.e. pauses in the stream of digital data. Is there a trick ...
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How to calculate the current from electrometer when connected with oscilloscope screen?

I am using a 6517b electrometer to measure of current with a 3-series oscilloscope for output value on its screen. I have connected the oscilloscope with an electrometer, but since the oscilloscope ...
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Best way to measure current through LED with oscilloscope

I'm using the following circuit: simulate this circuit – Schematic created using CircuitLab What's the best way to measure the current through the LED with an oscilloscope? Because the ...
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Filter signal on oscilloscope using math functions

Is there a way to do a time domain low pass filter, in software, on a Siglent SDS2000X Plus series oscilloscope using these math functions? The ones that stand out the most are ...
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How to get audio frequencies from mems microphone in PC oscilloscope

I'm fairly new to electronics/signal processing and I'm stuck on trying to obtain frequencies from an Adafruit SPW2430 MEMS microphone. I tried plugging the microphone to a Hantek 6022BE PC ...
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3 answers
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Confused in readings of oscilloscope

I have this reading of a oscilloscope for a half wave rectifier: Pk-Pk voltage is 17.6V. The channel is set to 5V division. I asked my dad who is a electric engineer and he told me that Vp = 17.6/2 = ...
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2 answers
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Doing digital IoT and some analog circuits without an oscilloscope

In my free time, I do electronic stuff as a hobby (at least for now.) I don't own an oscilloscope or a fancy multimeter due to the terrible financial state of my country. I am in Iran. In some ...
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How do I wire a seven segment LED display to display binary input from two buttons?

I've been tasked with implementing a circuit involving a seven segment LED display and two switches/buttons. One will inject '1' and the other injects '0' into the circuit, and every four inputs a ...
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2 votes
1 answer
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Scaling Waveform from LeCroy 4104HD using Python/IEEE488.2

I am automating control of a LeCroy oscilloscope using IEEE488.2 and Python/PyVisa. It seems like it should be relatively straightforward. I use the WF? command to get the waveform + header, I use the ...
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How to protect measurement equipment channels from ESD?

I was wondering what is the best way to protect measurement equipment, when handling like oscilloscopes/spectrum analyzers/Vnas/sensitive circuits (especially when stored in (none esd) foam)? I was ...
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I am having trouble measuring the amplitude of a 97 MHz signal with an oscilloscope with a bandwidth of 100 MHz

First, I designed a Colpitts oscillator with a frequency of around 94-97 MHz. I added a common emitter amplifier to the design to increase the output amplitude of the oscillator, then I connected the ...
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Half-wave rectifier with filter and clipped input signal in oscilloscope

When building a half-wave rectifier with a capacitor filter for my electronics lab, there was significant clipping at the peaks of the input signal. When looking at the .csv file pulled from the ...
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Using a multimeter to measure the VPP directly from an AWG output, how to?

tomorrow I'll have a lab class and we were told what we'll do in advance. So, since I don't want to be unprepared I started thinking about how to "solve" the problems, and I'm hardstuck at ...
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Oscilloscope "isolated" inputs

As I don't want to see my oscilloscope go up in flames when I play with probing circuits, I was wondering the following: First off, my goal is to measure different floating voltages aka the "GND&...
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1 answer
150 views

Measuring Ethernet Waveform on a scope

I measured the following waveform on a scope. It is a 100MBps Ethernet signal and I am measuring the TX+ and Tx- signals between the magnetics and RJ45 connector. I see what looks like a double ...
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3 votes
2 answers
229 views

What is the vertical scale set for this scope screen?

In a paper I came across I was confused interpreting the vertical scale. Below is the screenshot: Is each big square 2V or 100mV? (What does 2V and 100mV at the bottom mean?) In the zoom the voltage ...
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Auto-range test probe circuit

I've got a digital oscilloscope that can handle a maximum of 5V. On numerous occasions, if I know the range of a voltage, and it is above 5V, I have made simple voltage divider circuits to take ...
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If there is no feedback connection in this circuit how can I add a feedback connection?

I found a picture from Wikipedia about op-amp oscillator and I designed my circuit with this image from Wikipedia: But people say there is no feedback connection in my circuit. (I asked why ...
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Scope PC software to interface with a real scope [closed]

I have a HP54645D mixed-signal oscilloscope that can be fully controlled via RS-232. Is there some general-purpose oscilloscope software that provides a scope-like interface, kind of like the ...
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1 vote
2 answers
148 views

Are mini/pocket oscilloscopes like the DSO138 actually useful?

I'm a beginner in electronics and I was searching for a cheap oscilloscope when I found out about those mini oscilloscopes that are really cheap. I wonder whether they actually have any serious use ...
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1 vote
1 answer
130 views

IC melted down by connecting oscilloscope ground, but why?

I am currently digging into electronics and today I experienced a strange problem. I rebuild an oscillator circuit with the 30106 IC and I wanted to measure with my new oscilloscope (it is a china ...
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1 vote
1 answer
70 views

Confused about RLC series circuit waveform reading: Please help

Hi everyone, I simulated this simple circuit, but I am a little confused about my voltage readings. I calculated VL1 to be 1.279Vrms or 1.81V-pk, however, on the oscilloscope I'm getting a much ...
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90 views

32.768 kHz crystal - oscilloscope signal interpretation

As an exercise I measured (with a 100MHz 10x probe) the 32.768 kHz crystal signals on a board by varing the Cl1,/Cl2 capacitors. Here are the results: 12pF 15pF 22pF Can someone help me interpret ...
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2 answers
53 views

Problem measuring waveform on an LED and a low side MOSFET switch

I'm trying to measure the waveform on the drain of a low side MOSFET used as a switch for an LED with an oscilloscope. I tried two different configurations with different components and power rail ...
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High-voltage oscilloscope probe

I need to measure a high-voltage signal (1kV) with an oscilloscope without a commercial high voltage probe. So I have to design my own 100:1 probe. The oscilloscope has an input impedance of 1MOhm and ...
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3 answers
181 views

Probing with oscilloscope fixes noisy circuit

I'm trying to debug very strange behavior I'm seeing while I'm trying to breadboard out a circuit to test the passive values for an LED driver I'm designing. I am designing for a 28 V input and a 25.4 ...
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How do I display voltage on a Keysight DSOX1204G?

On page 37 of the manual, It clearly indicates the voltage in the top left hand corner of the screen DSOX1204G manual and hints that it would display the voltage for each channel next to the channel ...
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7 votes
2 answers
736 views

Measuring signal with of nanosecond pulse width with a spectrum analyser?

I'm looking to measure the signal width of electronic signals (device under test, DUT). The problem is that these signals have a quite short pulse width which would require me to use a GHz ...
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1 vote
2 answers
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How do certain oscilloscopes have high isolation between channels? [duplicate]

At first, I couldn't think of any mechanism to get great isolation between the front-end and the sense amps because hundreds of volts of isolation sounds like capacitive isolation. Capacitive coupling ...
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1 vote
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What determines amplitude resolution of oscilloscope FFT?

I am studying my oscilloscope's FFT measurement capability (Rigol DS1054Z. Links to datasheet and user guide), and do not understand what determines the amplitude resolution capability of the FFT ...
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-1 votes
1 answer
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UTD 2052 oscilloscope: read data from .sav file

I just recently got an oscilloscope and was happy to try it out. Now I have a problem with reading the data. The model I am using is the UTD2052 50 Mhz scope. I can save the data to a USB drive in the ...
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2 votes
3 answers
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SPI MOSI signal disturbance only when multiple peripherals are connected

I have two PCBs connected via ~20 cm ribbon cables to a Raspberry Pi (with a custom breakout board at the pi). The PCBs each have some port expanders (MCP23S08) and DACs on them, all of which I'm ...
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1 answer
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DC Motor on Oscilloscope Explanation

I'm wanting to view my DC voltage waveform on a 90V DC motor. I'm currently using differential mode on my oscilloscope between A+ and A- to create what I believe is a representation of the dc voltage ...
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-1 votes
2 answers
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Oscilloscope noise and 20 MHz bandwidth limit

My GW Instek GDS-1102B oscilloscope is showing some high frequency noise even with the bandwidth limit ON, but I am not sure if this high frequency noise should be present or it should be more ...
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DC power supply 10V AC between terminals and mains earth

My DC power supply shows 10V AC between earth and one of the terminals. How can I fix this, and is it safe to probe circuits with an oscilloscope, that are powered by it? The PSU ground terminal is ...
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Measuring inductor current with oscilloscope in a parallel RLC circuit

How can I obtain the inductor current waveform on the oscilloscope? If L=1 henry then integral of voltage across the inductor can give me the current but if the oscilloscope can't take the integral ...
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141 views

When does a x100 2000V scope probe not work at 2000V?

I refer to this X100 scope lead, and to this relevant question & answer for that product: Q: According to the 4100 user's guide the voltage rating at 10 MHz is only 100 V. shouldn't it be 2000 V ...
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