Questions tagged [oscilloscope]

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

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45 views

Noise on Oscilloscope

I need to measure voltage noise with my oscilloscope. For that, I first check the input Noise of the scope itself with the input shorted. Bandwidth filter (20 MHz) is on, nothing attached on the input ...
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53 views

What was the point of an “alignment scope” like Kikusui 5091, and can anything be done about it's dismal horizontal bandwidth?

I got this Kikusui 5091 used for US$ 50 bucks, as a reward for my pretty successful attempt to create a digital raster display from scratch on my oscilloscope, and finishing off my Game of Life in ...
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2answers
59 views

Problem in measuring potential because of oscilloscope's input impedance

I am trying to use a sensor, whose resistance value change from infinity to around 10kΩ when variable load is applied. The load is applied for a small duration and in order to capture that I'm using ...
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1answer
51 views

How do I use the Z-input on my oscilloscope (full range of contrast / brightness)?

I guess all scopes are a little different and don't provide any adjustment knobs for the Z-axis input. Mine is a Protek 6502A and it's Z-axis spec says Z Axis Modulation: Sensitivity: 5V P-P (...
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67 views

Bezier curves in hardware? (X-Y-mode on oscilloscope)

As I am exploring how to use an oscilloscope as a raster display in a question yesterday, and building the circuit, I am finding that with about the same (even less) components I could build a vector ...
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38 views

Voltage difference on DSO-150 'scope' and Fluke 87 multimeter

I am attempting to use a ESP32 to make a Yamaha Receiver internet connected through the receiver's cabled connection to pass remote button presses. I have found a manual detailing the protocol and ...
2
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2answers
40 views

Oscilloscope high impedance ground more noise?

If I setup the two situations in the diagram below one where a scope is connected to the output of an SMPS, and one where a resistor is placed between the grounds of the scope and the supply (which is ...
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3answers
41 views

Calculate the phase angle

I have a question about the sign of Δt : Why is Δt in in this one positive And negative for this one below ?
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1answer
515 views

New Rigol Scope is this Oscillation Normal?

I just bought a new MSO2000A series Rigol scope, 300MHz bandwidth version. When you set the timebase to 20ns or below, there is an oscillation present. Can anyone else with this series of Rigol scopes ...
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2answers
66 views

Why is oscilloscope measuring a higher voltage at high impedance?

The input to the scope is 358 MHz sine wave. It's coming from a four way power splitter, unsure of what is upstream of that. At 50 ohms its measuring 931 mV peak to peak. At 1Mohm its measuring 1.27V. ...
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2k views

Is this a safe way to measure mains power on an oscilloscope?

I wanted to use my cheap battery powered single-channel oscilloscope or my Rigol 1054Z to see the 120V AC mains signal in my house. No particular reason, just curious. I at least knew enough to not ...
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1answer
62 views

Reason for 27 MOhm resistors on Analog Discovery oscilloscope

I am looking at the schematic diagram of a BNC adapter for Analog Discovery 2 oscilloscope inputs, and I see 27 MOhm resistors R3 and R4 (see the figure). What is the point of these resistors?
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462 views

UART in my code transmits a character, yet on the oscilloscope I find it gave me another signal

I using MSP430FR6989 microcontroller (development board MSP-EXP430FR6989) to try and send a UART signal via it's TX pin The configuration of the MSP430: Clock System 32.768 Khz Baud Rate 9600 8 bits, ...
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383 views

How to set an oscilloscope for measurement of interrupt service routine execution time

I have been developing control software and I need to know how much time it takes to execute an interrupt service routine (ISR). I have decided to use a dedicated GPIO pin of my microcontroller and an ...
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24 views

Question about trigger on FNIRSI oscilloscope

I am new on oscilloscopes. I bought a FNIRSI PRO DSO. To test it I tried sending ASCII characters on an Arduino UART with the probe connected to TX and GND. I put the command 'Serial.print("...
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68 views

Full Bridge Rectifier Oscilloscope Reading

I am trying to read the output wave of a full bridge rectifier circuit on my oscilloscope, but the waveform looks really funky. I've set it up as shown in the spice simulation where resistor R1 ...
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1answer
60 views

Single ended scope probes on equipment under test which ARE on an isolation transformer

I am using my company's new oscilloscope and I don't want to mess it up. I have searched all of the topics, but nothing tells me exactly what I want to know so I thought I would ask in case somebody ...
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2answers
65 views

Benchmarking C++ functions' execution speed with GPIO and oscilloscope

For a research project, I'm trying to determine the execution time of various C++ functions on a Raspberry Pi and an STM32 microcontroller. To do so, I plan on triggering GPIO pulses before and after ...
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3answers
94 views

Measuring the waveform of mains voltage using an oscilloscope

I understand this is a recurring discussion, but I still can't find a concrete answer to this question. I would like to know how can I inspect the waveform of my UPS output (230V) using an ...
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111 views

Easiest/Cheapest alternative of an oscilloscope to observe PWM signal, if any

Is there a tool/method that I can make use of instead of an oscilloscope to be able to display or at least gather information such that its frequency and on-off times of a PWM signal, out of a ...
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0answers
30 views

50 ohm D-dot probe measured with 50 ohm scope

I am attempting to measure the signal from a 50 ohm D-dot probe. The manufacturer says to use a 1M ohm scope but I only have a 50 ohm scope. How do I need to set up my tools correctly to receive an ...
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1answer
50 views

Measuring Current in Coax Cable Using Clamp on Current Probe

I once again find myself needing to measure the RF current in a coaxial cable. The signal in question is a high power (100W-1kW range) signal which is a stepped waveform with a 5MHz fundemental with ...
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1answer
54 views

Oscilloscope voltage not matching function generator

What are the reasons why my oscilloscope shows a different voltage from my function generator? I have set the Vpp of the function generator to be 10V, but I set the probe to 10x and on the device, it ...
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1answer
45 views

How to wire this linear Hall effect sensor

I want to measure alternating magnetic fields 50 Hz to 100kHz. I have the Honeywell SS 495 A linear Hall effect sensor and have used it like in the circuit diagram: . I could successfully measure a ...
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2answers
29 views

TIVA TM4C123G check clock frequency with oscilloscope

I'm trying to configure system clock in the TIVA TM4C123g board. I'm aware that this clock signal goes to a pin called OSC0 which, according to this, is the pin ...
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1answer
53 views

Quantitative analysis of capacitive pickup of 60 Hz by an oscilloscope probe

I was recently looking at a couple of Q&A's on this site for a description of capacitive pickup of 60 Hz by an oscilloscope probe: My scope detects a 50Hz signal when the probe is not connected ...
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1answer
100 views

Measuring the voltage drop across electrical components doesn't match the calculated values

I have a newbie question regarding circuit analysis. I have a simple circuit with a voltage source of +4.32V (output of a u7805C voltage regulator), an 18K Ohm resistor, a normally open push button, ...
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3answers
108 views

Why adding capacitor to a 10x passive oscilloscope probe

I'm trying to understanding input impedance and its circuitry of a simple, passive oscilloscope 10x probe. From reading Input Impedance of an Oscilloscope and the video EEVblog #453 - Mysteries of x1 ...
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72 views

Testing limitations of a low bandwidth cheapie oscilliscope

Learning basic electronics. Have a few multi-meters. I'm researching "cheapie" less than $100 oscilloscopes. I read that the most important spec is bandwidth. I've noted that $40 to $100 scopes ...
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17 views

High-Pass Filter Setup

In several designs I've come across the following setup. Design -> RC Network (High Pass) -> Oscilloscope Input: Where SK2 is the SMA connector from the PCB that goes into an oscilloscope. Some ...
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28 views

Piezoelectric Backscatter Communication

I am currently working on a project. We have a metal bar as test object and at each end we stuck a piezo disc. I am trying to use one piezo as a sender and the other as receiver or reflector. I tried ...
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1answer
46 views

PWM signal not visible upon increasing the scope time base

I am capturing 2 different PWM signals. The frequency of first PWM signal is lower when compared to the second one. Please check the waveforms. All the waveforms are taken of the same two signals. ...
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23 views

Standard SCPI commands - Hantek DSO4004C Series

I own an oscilloscope from Hantek (DSO4254C). Want to write my own library for accessing the DSO in C which uses the usbtmc driver in Linux. Are there some standard IEEE488 commands which the DSO ...
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3answers
66 views

Making Sense of oscilloscope specifications

When looking for oscilloscopes, you often see the following specs: bandwidth [in Hz] sampling rate [in Samples/s] capture rate [in waveforms/s] record length [in pts/channel] My question is: How are ...
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45 views

Why is an attenuator placed on the scope end and not the PCB end?

I've noticed when adding an external attenuator between PCB and the scope (1MOhm) that it is placed in this manner: PCB -> SMA Socket -> SMA Cable Plug -> SMA Attenuator -> SMA-to-BNC -> Scope Why ...
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2answers
59 views

Magnetic field sensor for oscilloscope

I want to measure magnetic fields with my oscilloscope, so I need a magnetic field sensor / probe. My oscilloscope does a FFT for 50Hz to 2MHz. The sensor should be 3D, because I don't care for ...
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2answers
218 views

When do we have to use an analog oscilloscope?

Are there any testing/measurement processes in electric and electronic engineering that can be done only with an analog oscilloscope? In digital scopes there is a short delay to process the signal (...
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2answers
140 views

Crystal oscillator not giving true square wave

I just purchased an oscilloscope and I was testing it on a 10MHz crystal oscillator (OSC-25CMN 10.00000MHz SIWARD 6C). I noticed that the signal is very distorted (see pic). I also tested a 40MHz ...
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1answer
30 views

MCP3008/ADuM3154/ESP32 - Corrupted MISO Data Line

I have 3 MCP3008's being read by an ESP32 on the same bus isolated by an ADUM3154ARSZ. I was reading each pin on the MCP3008's about every 10ms. I seemed to have a lot of jitter and after averaging ...
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1answer
63 views

Additional Voltage on I2C Bus

I have redesigned one of my boards to the ICM-20689 (datasheet) instead of the ICM-20789 because of a voltage issue that I previously had. Link to previous issue. A little background on my setup. The ...
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49 views

Why does my oscilloscope work even without the ground connected to the circuit?

I am using an oscillator to produce a sinusoidal signal of around 100kHz. I am using a Hantek PC oscilloscope for testing. I observed that even though I disconnect the oscilloscope ground from my ...
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2answers
46 views

How to find the cutoff frequency using Simulink (from the scope)?

R=1000 ohm C=0.1uF I need to find the cutoff frequency from the scope and to show it matches the theory \$f= \frac{1}{2pi*RC}\$ In this case it's 1591Hz. How do I measure it?
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95 views

How can I accurately and precisely measure current in a 110V AC circuit, with a 1kohm-50kohm load, using an oscilloscope?

I need to measure the electrical resistance of a volume of ground. To do this I need to cause a current to flow between two metal electrodes pushed into the soil (let's call them the "current" ...
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17 views

Disabling menus on MSO2024B

The Tektronix MSO2024B oscilloscope has annoying menus that continually pop up when you adjust the scale , time base, or any other setting on the scope that you need to remove (by clicking waveform ...
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27 views

DS212 mini DSO triggering in DC circuits

I am trying to understand how triggering works on my DS212 DSO (User manual). My goal is to capture the voltage change across a coil in a DC circuit when a switch is closed. The Trigger menu on the ...
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2answers
108 views

Why is there a difference in the voltage drop across the same resistor when using an oscilloscope and a multimeter?

I am measuring the voltage drop across a 1 ohm resistor within a circuit with an oscilloscope and a multimeter. The impedance of the oscilloscope is 1M ohm and the impedance of the multimeter is 10M ...
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82 views

What is the minimum frequency of AC source to show IV curve on oscilloscope?

I want to show i-v curve of a resistor on oscilloscope. I know the voltage source should be AC, but what is the minimum frequency the voltage source should have to work properly? What will happen if ...
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3answers
276 views

Audio signal on oscilloscope

I am exploring the mainboard of an Epson 3010 projector. This particular projector has internal speakers but does not have an audio out and - as I have built my own external audio amplifier - I wanted ...
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1answer
60 views

Proteus oscilloscope errors

i have this homework in proteus , but because of the virus my theacher can t explain very good how to use this program.I have this circuit and i can't play it.I attached the circuit and the errors ...
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1answer
86 views

Oscilloscope voltage readings factor of 10 too high. Is this due to the impedance?

For a university physics experiment, I built a circuit to test voltage (and conductance) steps across a nanowire break junction. The break junction was in a circuit with an I-V converter, and the I-V ...

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