Questions tagged [oscilloscope]
A piece of measurement equipment which can visualize one or more signals simultaneously on a time scale.
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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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2answers
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 ...
2
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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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2answers
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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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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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, ...
7
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2answers
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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2answers
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 ...
0
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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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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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2answers
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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0answers
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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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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2answers
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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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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1answer
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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1answer
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 ...
