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

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91 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 ...
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2answers
48 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 ...
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3answers
134 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
35 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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82 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?".
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3answers
376 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 ...
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2answers
70 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 ...
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1answer
55 views

Power supply noise measurements

Im working on a project where I need characterise the noise from a power supply so I can then design some filters. The power supply provides 5V, 12V and -12V to a set of analogue sensors (hence the ...
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2answers
73 views

Oscilloscope measuring of PMT in photon counting mode

I have a setup as drawn below: DC source of 15V connected to high voltage (HV) source of 1500V connected to photomultiplier tube Hamamatsu, R1-R3 are resistors builtin the socket of PMT (there are ...
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1answer
129 views

On a Rigol DS1052E oscilloscope, what does the word “Local” mean?

On the front panel of my Rigol DS1052E oscilloscope, on the "TRIGGER" column of controls, the word "Local" is written alongside the bottom button, labelled "FORCE" . What is the significance of this ...
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28 views

Hitachi V-1050F 2nd Channel Problem

I have a Hitachi V-1050F Analog 100MHz Oscilloscope (operator's manual, service manual (5 part download)). Recently I noticed that the second channel does not display square waves correctly. The ...
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1answer
42 views

measuring load cell output by a oscilloscope

Is it possible to read a load cell output (0~10mV with 10nV steps) by a oscilloscope? or I should buy an extra high precision Multimeter to read the load cell output?
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1answer
37 views

DSO Screen Refresh - Start position

I just picked up my first DSO Oscilloscope, A Siglent SDS1052DL. I have never used an Oscilloscope, so I am trying to learn the basics. I have the following square wave, which drifts during the screen ...
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2answers
117 views

Negative voltages in the real world?

I was given the task to design a circuit that has a 5V input and uses a differential op amp to provide an output that oscillates between 5V and -5V. The design I came up with is the following: ...
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2answers
148 views

What is the red/orange coating underneath a CRT anode suction cup, and is it important?

This question is regarding a matte red/orange coating around the anode socket on a cathode ray tube which is made to be connected to via a cable with a suction cup, the coating seems to typically be ...
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1answer
74 views

Oscilloscope probe changes the frequency of the signal

I have a microcontroller that outputs a 50% duty cycle PWM signal at 500kHz. That is then connected to the gate of a MOSFET. Now, I want to measure the PWM signal at the gate of the MOSFET. If I ...
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46 views

Series diode voltage clipper, on Multisim clipping and shifting on positive and negative voltage

This is my circuit: I’m testing a Series diode clipper circuit, and the end result should be this: (I've used 5V in my circuit, not 10V like in this plot, but this is not the issue) Instead what ...
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1answer
104 views

Setting an oscilloscope to read a noise level

what to set an oscilloscope to when reading a 10 mV noise level on a 12 V power supply output? Frequency is unimportant.
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1answer
48 views

What are appropriate probes for use with a HP 54501A Osciliscope

I'm fairly new to hobby electronics, but when my office remodeled (I work on software in an EE lab) they were throwing out a HP 54501A scope that I was allowed to take. It didn't come with any probes, ...
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47 views

Trouble looking at Serial data my Scope

I can't seem to get anything looking like a square wave while connected to RS485 or RS 232. I'm not sure what I'm doing wrong. Here is a pic with time base increased.
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2answers
80 views

How to eliminate 50 Hz noise from amplifier's output

My goal is to amplify signals with a frequency from 100Hz above. My circuit is looking as the picture below. With an oscilloscope, I am trying to measure the output of the amplifier. If the input of ...
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2answers
81 views

Using Op-Amp for attenuation to give input to sound card

I know there is lot of question asked about this topic before, I read them but there are some limitation on those circuits which make me ask this one. I want to do analysis of main ...
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1answer
529 views

How to set the oscilloscope to measure potential between two points that aren't ground?

We have to measure the voltage across a-b in this circuit with an analog oscilloscope, but neither of these points are grounded. How should we put the channels of oscilloscope to perform the ...
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2answers
121 views

Analog oscilloscope triggers

I have recently received an old 70's era Tektronix 465b dual trace oscilloscope. Unfortunately I have close to no clue how to use it. I understand the concept of triggering but this scope has two ...
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1answer
129 views

Why does the GND of the Arduino oscillating as well?

I have an Arduino Uno and what it does is simply output an oscillating signal of 1 MHz on PIN11. I measured the signal using a oscilloscope and a probe with a ground clip. First, I connected the probe ...
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1answer
103 views

Measuring DC motor voltage with an oscilloscope

My current setup involves an analog controller board that is driving a DC motor and I would like to monitor the voltage being applied to the motor at all times. How do I physically connect the ...
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1answer
63 views

Is accelerometer taking as much power (current) as it needs? [closed]

I want to connect accelerometer to an oscilloscope. I have 3x AA rechargable batteries (2550mAh). I was told that e.g. microcontroller knows how much amps should it take and it wont burn if I ...
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1answer
53 views

Testing an I2S slave device

i have a MEMS mic with digital I2S output. What is the easiest way to test that my microphone communicates right? No need to verify the sound, i just need to verify on bit level that communication ...
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3answers
314 views

How do you attach an oscilloscope ground spring?

Sometimes you need to ensure that your oscilloscope probe ground lead is not creating measurement error such as ringing and overshoot. In various forms, I have seen (and successfully used) a ground ...
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1answer
61 views

Why does oscilloscope still shows the signal even though its GND is not connected?

if i connect oscilloscop's + probe to the components's plus side it still shows the signal. But how can this happen without connecting the GND ?
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3answers
153 views

How to identify if noise is coming from circuit or scope?

Occasionally, I'll be probing a circuit and would expect to see something specific and sometimes I see either crap or the signal im expecting with crap. This video from EEVBLOG is a good example of ...
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55 views

How to reduce line noise on oscilloscope?

I bought an oscilloscope, and wanted to try it out at home. However, when I plug a probe into a channel, and the power into the plug of my workshop room, I see the 50 Hz line noise from the power ...
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15 views

Reveal Agilent MSOX3034A trigger date/time

An error condition occurs once every couple of hours. I've set up my scope to trig on the condition, so I can inspect what happened. But I also need to couple the time the condition occurs with a log ...
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37 views

Can't drive adafruit display with Arduino DUE

I'm currently trying to write a library for the Adafruit ST7565 graphic display. (see links below) The current one is entirely AVR specific and the code is generally pretty unreadable given the ...
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2answers
263 views

Weird oscilloscope readings with a digital signal (ws2812)

Pretty new to oscilloscopes. I'm trying to learn stm32, so one of the projects I'm working on is getting ws2812 LEDS working on stm32. It does work for most strips, however, there are few strips ...
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3answers
90 views

Sniffing twisted pair without interupt

Is it possible, with an oscilloscope, scalpel and a lot of patient, to open up a network cable (twisted pair), and sniff the traffic? All without interrupting the network traffic. So; Use the ...
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4answers
84 views

Impedance mismatch

When I connect an oscilloscope to a function generator use both oscilloscope cable (one connect to the scope and one connect to the FG), I got 700mVpp when outputing a sine wave of 1Vpp and 10kHz. ...
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1answer
148 views

I2C protocol debugging using oscilloscope

We are testing an I2C accelerometer connected to the ATMega32A micro-controller. The accelerometer was working fine. We can write and read the registers using I2C protocol. When connected to the ...
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1answer
133 views

Measuring the input impedance of an oscilloscope

I am measuring the voltage drop on a 1MΩ resistor with an oscilloscope, and as I understand to get accurate readings I should compensate the internal impedance of my measurement device for such a high ...
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3answers
101 views

Compensating input impedance

I'm trying to measure the reverse leakage current of some diodes with the method proposed HERE - the diode is connected in reverse bias to 5V through 1 megaohm and voltage is measured across the ...
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1answer
274 views

Why is it wrong to connect an oscilloscope in parallel with a circuit element?

I was told that it is incorrect to measure the DC voltage across a circuit element using an oscilloscope by putting the probe on one side and the ground clip on the other. I am supposed to connect the ...
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0answers
83 views

PWM only works after touched with oscillicope probe

I am using two PWM outputs from a Netduino 2 to control two servos. One of the PWM pins works perfectly fine but the other doesn't work until I have touched it with an oscope probe. The probe doesn't ...
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1answer
94 views

Output resistance of Emitter Follower

I have to measure \$R_{in}\$, the input resistance seen by the signal. It was told me, that the quickest way is measuring the voltage gain using oscilloscope, insert a resistor before \$R_B\$, ...
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2answers
102 views

Internal resistance of signal source

It was told me that a signal sent to the circuit can be rapresented by \$V_{sig}\$ and \$R_{sig}\$, where \$R_{sig}\$ is the internal resistance of signal source. Now, let's consider that we have a ...
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1answer
100 views

Oscilloscope specs [closed]

I'm looking to buy my first oscilloscope, no experience, hence need a bit advice on typical lower-budget scopes. A particular purpose is to look at rise time of rectangular waves with rise time ...
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0answers
178 views

RTC DS1307 3.3V I2C and Oscilloscope impedance

I'm working on a library for STM32 to learn I2C protocol (Software I2C, not hardware). I connect my DS1307 (Sparkfun BOB-12708) : (Here is the module schematic) : I remove welding on the SJ2 jumper ...
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1answer
74 views

Tenma 72 6800 20Mhz [closed]

I'm looking to buy my first scope to help with analysis of circuits and have come across a lot of the above scopes. I have a few project on and believe I can use this scope to measure 12V to 240V wave ...
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4answers
243 views

How do I average a complex waveform?

I am trying to figure out how long my project will last on a single battery. It's powered by a single AA battery with an NCP1402 3.3 volt boost converter. I've determined that the target circuit draws ...
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0answers
120 views

How to measure the peak current (inrush current) and results assessment

I would like to peak the inrush current of a controller. The voltage input of the system is 24V and the only thing which is available, is an oscilloscope and a variety of resistors. The basic idea is ...
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2answers
340 views

Difference between DMM and oscilloscope measurements

I have a 220 - 14 V transformer, but when I hook it up to oscilloscope or DMM they show different values. DMM shows 11.8V and oscilloscope shows 17.2. Ok, this is cheap Chinese transformer, so it can ...