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

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30 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
90 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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184 views

Project: low pass filters and summing amplifiers [on hold]

So I got this school project I've mostly completed (I just need to make graphs.) Questions/needs 1) I'd love some feed back and input on it, just to see what I could improve or any mistakes I've ...
0
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1answer
28 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. ...
3
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2answers
393 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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30 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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29 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 ...
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1answer
26 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 ...
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1answer
45 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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20 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 ...
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1answer
30 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 ...
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1answer
37 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: ...
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1answer
44 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 ...
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1answer
49 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
102 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 ...
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2answers
58 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 ...
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0answers
41 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
130 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 ...
2
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1answer
67 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
88 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 ...
2
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1answer
43 views

Ground Plane Noise?

I have some noise issues on a PCB that I am having a hard time troubleshooting. Below are pictures of the schematic as well as 2 scope traces. The first trace shows the amplified signal with the noise ...
2
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1answer
29 views

Measure propagation velocity through finite transmission line

I'm currently trying generate a wave in a circuit but am running into the issue of figuring out exactly how to measure the propagation velocity. The circuit diagram is below L1=L2=L3, C1=C2=C3, ...
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43 views

Multiple Oscilloscope measurement in Multisim with small Variance

I have a design that consists of several stages, it's Dual DC Regulated DC power supply, using transformer, bridge rectifier, capacitor filter and regulator. We add the components one by one and each ...
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0answers
38 views

Oscilloscope Tektronic MDO 3034 Digital and Analog channel synchronization issue

My oscilloscope becomes really slow whenever I measure (direction and steps) digital signals from two stepper motors. This slowliness happens after I "zoom out" on my oscilloscope (e.g., make the ...
2
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2answers
58 views

How does an electron beam move in XY mode?

I was recently observing some Lissajous figures on an analog scope in XY mode . I was wondering how does the electron beam move . I know it should move from left to right but I find it difficult to ...
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1answer
81 views

Test 220V 50 Hz signal using oscilloscope [duplicate]

Can I test a direct electric signal wave AC 220V 50 HZ using an oscilloscope in safe mode and the schema for this testing. The description in my oscilloscope say that the input AC pk and DC is Max ...
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1answer
74 views

AVR BASED USB OSCILLOSCOPE [closed]

I want to create a simple oscilloscope that uses an AVR microcontroller to take the input and provides the data to the computer through the USB port. The data is to be analysed by the computer. Can ...
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1answer
41 views

Stray Capacitance in my load waveform?

I have just taken this trace of my Loadwave form for PWM controlled halogen dimmer. I was wondering if anyone could identify the cause of the transients below or above zero volts for each polarity. ...
6
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3answers
914 views

First checks after oscilloscope unboxing

You bought your first entry level oscilloscope (e.g. Rigol DS1004Z series, 4 Channels, 50-100MHz, 1Gs/s) and while it is slowly warming up to room temperature you are wondering if the unit you have is ...
13
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4answers
358 views

About Oscilloscope Probing Philosophy

Recently, I read Tektronix's Probe Bandwidth Calculations. It point out that Tektronix and Agilent have different probing philosophy: There are two schools of thought on what an oscilloscope probe ...
5
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4answers
739 views

Audio signal trying to go back to zero zeroes

I created a two differrent signals on my android phone, one to act as the clock signal (lower signal), and the other to be the data signal (lower signal), but the problem is that the audio the signal ...
1
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1answer
81 views

What happened to my second half cycle of my half wave rectifier?

When I'm doing a simple half-wave rectifier with the set-up as shown above (Note: Diode D2 is not connected) and connected terminal 5 and 4 with positive and negative terminal of oscilloscope, this ...
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1answer
70 views

How to use an oscilloscope with a function generator?

I am taking a digital electronics class and I am utterly confused. I am using Multisim to design circuits, and for one of my labs I had to use a function generator with a oscilloscope. Here is a ...
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1answer
99 views

Question about op amp DC offset [closed]

I need help explaining why I am getting such a large DC offset across the output for my op amp. I am using an OPA548 to amplify an AC signal and then drive a solenoid shaker. I have the circuit ...
0
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3answers
94 views

Amplifying a 100mV range (sinosoidal wave) to a range of 0 - 3.3V for the Arduino

I have a partial discharge wave form which varies between -100mV to +100mV. For simplification, I am using a sinusoidal wave with that range. I need to amplify and bias this signal between the range ...
1
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2answers
83 views

Oscilloscope Output with its positive terminal touching human's body and negative terminal left open

it once happened that when I touched the positive terminal of the Oscilloscope input probes letting its negative terminal open, I observed sinusoidal voltage signals with 0.5V peak to peak and of ...
3
votes
1answer
333 views

Using oscilloscope to measure voltage across a resistor

I have a board which is powered by a 5V PSU. I needed to measure the current flowing into the processor for computing power. Since there was no resistor that I could find in the path from the supply ...
0
votes
1answer
89 views

AC->DC Power supply ground and probing

I'm learning electronics and I have an old C64 power supply which was made at our local electrical shop back in the 80s. I'm taking a look at it to try and understand how it works. What I don't ...
3
votes
3answers
381 views

Questions about advanced use of oscilloscope

At my university, I'll be using the ELENCO S-1325 oscilloscope for a instrumentation lab. Since I'm a mechanical engineering student and not an electrical engineering one, I don't know exactly how ...
0
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1answer
35 views

collecting Sample points on the oscilloscope

I am using a 1.5GHz bandwidth and 20GSamples/sec oscilloscope to measure a signal. The measurement is TDR(Time Domain Refelctometry) I would like to collect the raw data from the oscilloscope. How ...
2
votes
2answers
112 views

What is the source of leakage current thru an isolation transformer?

I want to use my oscilloscope to check the cleanliness of the output a high-voltage power supply (electrophoresis type, up to 3000 volts DC). I built a 100:1 voltage divider (out of 2 resistors - ...
0
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2answers
117 views

Plugging in an oscilloscope in a land of non-grounded outlets

Background: I have only one outlet in my house that remotely approximates a proper equipment grounding conductor (it's bonded to the mains ground point via the armor of 50s vintage AC, which is better ...
0
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1answer
111 views

Bitscope DC Offset

I had an old Tektronix scope for a few years that finally gave out. I recently purchased a Bitscope, but it seems to be having some problems. I have connected the function generator to channel A, and ...
1
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1answer
139 views

What signals can be probed with an oscilloscope on an Arduino board?

I got my hands on 35 MHz analog oscilloscope. I'm trying to learn how to use it. Is there something that can be seen with a scope like this on an Ardiuno board? Clock signal maybe? The board I'm ...
0
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2answers
218 views

Does FFT (fast fourier transform) give RMS or peak to peak amplitude vs frequency?

I am using periodic triangular wave (Vp-p=3V, freq= 2kHz), as an input to my oscilloscope to do FFT. My question is that does the magnitude(y axis) of in FFT plot represent the peak to peak ...
0
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3answers
153 views

Can I visually obtain an equation from this curve?

While I was in the lab I was able to get the correct voltage curves on the oscilloscope, but time was short so I took a picture instead of measuring the voltage incrementally (the ultimate goal being ...
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1answer
124 views

Probe characteristics- what is CAT 1 and CAT 2 means?

What does this mean? Maximum input voltage : 300 VRMS CAT II Maximum input voltage : 300 VRMS CAT I
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1answer
113 views

why does a x100 oscilloscope probe grant a wider bandwidth than a x10 probe

I was asked in an interview the question "why does A x100 oscilloscope probe grant a wider bandwidth than a x10 probe? How much does it widen it?".
3
votes
3answers
415 views

How does a passive 1x Scope probe work?

I understand about input impedance and capacitance... My question relates to the cable: What is the characteristic impedance of the cable connecting the probe to the scope? It must be terminated in a ...
0
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2answers
152 views

Arduino-based oscilloscope: attenuate the input by varying reference voltage?

I don't have a proper oscilloscope. I don't have the budget to buy one, even a used one. I have to roll my own. :( The plan is to use an Arduino Leonardo or Due as a combined A/D and USB interface ...