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Questions tagged [oscilloscope]

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

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2answers
36 views

VI component tester not working properly when capacitor is placed parallel with diode

I am trying to repair mainboards with VI component tester. (Such as this device and that device.) I check the characteristic VI curves of the components on the card and identify the defective parts ...
2
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1answer
57 views

Probing with oscilloscope causes current drop

We are testing a fabricated chip with expected output current of around 4mA which is then used to charge a button cell. The input is from a PV cell. However, when we attach an oscilloscope probe onto ...
2
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1answer
59 views

How to measure PWM on Oscilloscope?

I’m measuring the voltage level from an Arduino Uno PWM pin using an oscilloscope. I’m using analogWrite(pin, voltage) in the loop with ...
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1answer
62 views

Limitations of sound card oscilloscope

I’m supposed to build a buffer circuit for pc oscilloscope using the sound card of the pc and a software “zelscope”; however there’re limitations: Not possible to display DC because there’s a DC ...
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1answer
57 views

How do laboratory devices (from photo) work with BNC cables, connected to ground

The title is a bit cumbersome because my questions are a bit difficult to describe. Here is a photo from Practical Electronics for Inventors by Paul Scherz I'm curious on a few things: How does the ...
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1answer
47 views

Oscilloscope measurement of square wave

I am using my Arduino uno to generate a 500Hz Square wave between 0 and 5 volts. I am measuring the signal from the Arduino using an oscilloscope and instead of measuring 5 volts peak to peak, it ...
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0answers
64 views

Earth Grounded Oscilloscope or Not?

I am new to electronics and the use of an oscilloscope. I have read several threads about the dangers of floating an o-scope. I own a Rigol DS1052E o-scope. I've noticed that the BNC ground on the ...
13
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3answers
1k views

Why are oscilloscope input impedances so low?

My question is two-fold: Where does the input impedance come from? I'm wondering where the input impedance of your average multimeter or oscilloscope comes from? Is it just the input impedance to ...
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0answers
41 views

Setting measurement points of the 74HC86 delay time

simulate this circuit – Schematic created using CircuitLab I'm measuring a propagation delay and transition delay of a 74HC86 chip. I setted somewhat high frequency square-wave signal(100kHz) ...
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0answers
57 views

How the oscilloscope input voltage rating is independent from attenuator setting

Since I'm taking part in a quite interesting educational project that incorporates the design and testing of the analog front-end of a relatively high speed ADC (up to 200 MSps) I've been studying the ...
1
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1answer
62 views

MAX485 controlling output voltage

I'm trying to use a MAX485 module to interface a RS-485 domotic bus, when I use the oscilloscope I see that the original bus signals (A and B) are between 1.9 V high and -2.250 V low (4.15 V amplitude,...
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5answers
4k views

CRT Oscilloscope - part of the plot is missing

I picked up an old METRIX OX 720 oscilloscope. I replaced 2 capacitors that went up in smoke. Once restarted, here is the signal I get. The vertical part of the signal is missing. It is the same ...
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1answer
78 views

Rigol DS4000 oscilloscope screenshot takes forever [closed]

I'm working with a Rigol DS4000 series oscilloscope and want to be able to save screenshots from it. I've got a hardware-encrypted USB flash drive connected to it, and I've noticed that when I try to ...
12
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4answers
1k views

Why are current probes so expensive?

I notice that clamp-type current meters range in price from a few dozen dollars to a few hundred, but current probes for oscilloscopes cost significantly more, with many close to $1000 and some well ...
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0answers
13 views

Trio CS1352 oscilloscope trigger/blanking board photo needed

It may be a very long shot. But is there any one with a Trio CS 1352 who could send me a photo of the trigger/blanking board both sides? My board has some weird jumpers that do not match the schematic ...
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3answers
172 views

What the heck is a “radiator plate” in a CRT based oscilloscope?

I managed to pickup a used BK Precision 1474 oscilloscope for $10 and figured it would be a good gamble for the price, I powered it up and the CRT had no spot. I did some hunting and managed to find ...
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1answer
54 views

How does the output jump up to 7.5 volts when the switch is closed and opened again?

Sorry if the question might sound dumb. In this circuit, when the switch is closed the output voltage drops to zero and then rapidly charges back up to 5 volts. My question being, when the switch is ...
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2answers
67 views

Negative pluse generator does not reach 0V

I'm using an Arduino board to generate a 125KHz square wave signal to feed into this curcuit: simulate this circuit – Schematic created using CircuitLab So this is what I'm receiving from my ...
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2answers
74 views

Does polarity of scope probe matter when measuring ripple of the power supply module?

Measuring ripple of 28V/12V power supply module across +/- output pins. Does the probe tip have to be placed at +pin and probe gnd to -pin, or it can be reversed? Having inverted readings when ...
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1answer
54 views

oscilloscope turning off during pulsed power tests

I'm recording voltage and current waveforms using an oscilloscope. The application is pulsed power. A problem I am having is the oscilloscope is losing power / turning off when I trigger the system....
19
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5answers
5k views

Why can't I see bouncing of a switch on an oscilloscope?

I'm trying to view the bouncing of a simple switch on an oscilloscope. I have prepared a simple breadboard circuit (power → switch → resistor → ground). The problem is, it is displayed as a perfect ...
2
votes
3answers
145 views

I2C weird data and clock output/input

Hello I am trying to communicate that is using SMBus. So when I try to send a data which was 0x0D and address of the device was 0x16. I see something like that on the data line: And this is how my ...
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1answer
88 views

Reading digital wafevorms via VXI11 from the LeCroy wavesurfer 510/MS-500

I automating a test with an osciloscope via VXI11 with python's vxi11 package. I am using the remote control manual given by LeCroy. I am trying now to extract the raw Waveformdata according to page ...
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2answers
123 views

Oscilloscope range affecting voltage reading

I am trying to measure the current usage of a device using an oscilloscope. Every second the device turns on for a few milliseconds and then goes back to sleep. I need to find how much current is ...
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3answers
116 views

Trigger modi of an oscilloscope

I'm sure this belongs to the "every once in a while asked again" questions, but I've read several posts on this site and also on other sites and haven't found an answer to two of my questions, yet. ...
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0answers
65 views

SDS7102 DSO: No command to put scope in X/Y mode remotely?

I've had an SDS7102 (Owon) scope for little over a year, and bit by bit wrote a remote control program. As I use a LAN connection, things a quite a bit more complicated than USB, it seems. But I've ...
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2answers
116 views

Bouncing at some points in square wave

Well I am trying to make RPM and reading steps values 0-24 Volts. but in square wave there are a bouncing point which is illustration with red arrows marked. it makes electrical noise generation and ...
2
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1answer
122 views

How to setup the oscilloscope for measuring power supply response

I need to measure the overshoot and to modify some capacitor values in the feedback loop of the operational amplifiers in order to find the best response of the power supply (it's a linear power ...
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1answer
129 views

Using CD4093 as Schmitt trigger oscillator. How to measure high and low trigger thresholds?

Based on the suggestion of answerer in another post (this one: Adding Diodes to Transistor Astable Multivibrator; 1N5818 Schottky diodes work but 1N4148 diodes don't; can't figure out why), I ...
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votes
4answers
215 views

What is USB port on oscilloscope is for ? Can I power my Arduino from it? [closed]

I have a DS1102e oscilloscope (by Rigol,) picture attached below. I'm new to oscilloscopes and watched plenty of tutorials on how to use them, but I couldn't find the answer to my question. I need ...
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0answers
97 views

Why cant I get clear wave?

I'm trying to find a good stepper driver with low vibrations and low noise. So, I observed wave form between current sensing resistor of few stepper driver using my oscilloscope. The voltage between ...
2
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2answers
120 views

voltage traces across pwm driven dc-motor: is that ok?

I'm driving a dc-motor with a BJT turned on and off with a 555 generated PWM signal. Here's the circuit (V1, Rl and L1 simulate the motor): There actual circuit - same parts - is on a breadboard and ...
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1answer
159 views

Proper oscilloscope connection to prevent ground looping

I have a question about proper oscilloscope connection for doing work on vintage stereo equipment (120v AC input to +-76v DC board voltage). Our house wiring is a 1950’s 2 wire system with no ground ...
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1answer
79 views

Resolution of FRR Function

I am working with a oscilloscope GWINSTEK gds-2074a. As per the time resolution is concerned, turning the dial all the way down, it shows that it can go down to 1 ns. There is a Delay function in the ...
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0answers
110 views

Wrong measurement of DSO-5200A?

I'm using a DSO-5200A from Voltcraft and noticed the voltage measurement represented incorrectly (it is doubled). Any ideas how to reset this? Channel 1 (green) measures a (noisy) 5V and has a Vmean ...
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0answers
67 views

How to eliminate oscilloscope channel DC bias

When I set channel 1 as DC coupling, there is always -5.6v bias, even no cable is connected. Can someone tell me how can I eliminate this bias? Thank you
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4answers
136 views

Why do some oscilloscopes have several input channels?

Just was thinking to buy an oscilloscope, thus went to a shop and started to rummage all of the shops to buy an osci. which could be suitable for me. Read specifications of them. Some features was ...
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2answers
75 views

Oscilloscope probe pF values

I bought some time ago a 2nd hand Philips PM 3253 including probes which shows on the oscilloscope probe inputs: 1 MOhm, 20 pF While the probes I got with it ...
1
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1answer
75 views

Prevent oscilloscope scrolling

Background I already have a (2nd hand) Philips PM 3253 oscilloscope. Although it has many features and is fast (50 MHz) the display is so bad, it's barely usable. Therefore I bought another (2nd ...
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1answer
124 views

Overshoots and ringing…Do I need to compensate my probes or is it bad line termination?

When working with my DSO (Rigol DS2072A) I recently observed that signals have overshoots and showed some ringing as in the image below (it's a 2 MHz digital signal, SPI from a µC). I use the 10:1 ...
2
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1answer
181 views

How to save a bit sequence from oscilloscope?

I'm using two wires to communicate between devices. First wire is a clock, second is a data bit. Logic is simple: master device (AVR ATMega in my case) sets a value on the data pin, then raise "1" on ...
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1answer
59 views

Oscilloscope&function generator, opposite slope traced than trigger slope settings

I am wondering why the signal that was traced on my oscilloscope started on a negative slope when the trigger slope = rising. I externally triggered the oscilloscope by the TTL/CMOS output of a ...
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1answer
107 views

Oscilloscope Probe - How to measure a sensitive circuit

Help needed in measuring a tiny piezo actuator. The circuit bangs the actuator with a voltage ( max 50V ), then senses the ripples after the initial actuation. How can I measure with an oscilloscope ...
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0answers
23 views

Effect of impedance mismatch on phase of the signal

The effect of impedance mismatch on voltage measurement is known but is it possible for impedance mismatch between a oscilloscope and function generator to cause a phase difference? In my setup I have ...
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1answer
59 views

LED output with Photodiode and Function Generator

Some of my student and I are designing a Physics experiment involving a high power LED, a square wave from function generator (50 ohm output impedance) and a digital oscilloscope (1 MOhm imput ...
1
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1answer
47 views

Differences in voltage measurement at the input of a circuit

I am trying to understand the difference I am seeing in voltage signals, that I am applying to my circuit's input. So the basic layout is shown in the diagram, I have a connection, A from my function ...
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1answer
54 views

Oscilloscope and probes [closed]

What effect , if any, has using a x10 probe on: Voltage reading of oscilloscope with resistance box set to zero ohm? Voltage reading of oscilloscope with the resistance box set to 900k Ohm? And what ...
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1answer
31 views

USB disconnection when using differential probe

I have a simple setup described here : Laptop is battery powered. It communicates with DUT over USB. DUT is powered from switch power suppy. DUT earth / GND resistor = 1M Differential probe ...
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4answers
111 views

Can’t reproduce oscillations using a simple inductor capacitor circuit?

I’m trying to reproduce a simple oscillator conductor / inductor circuit as shown here. I replicated exactly the same scheme on a breadboard and check all the connections using a led However when ...
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1answer
83 views

Noise on my oscilloscope when probing a wire

I am prototyping a NTC voltage divider circuit and I am having trouble with noise on my probe. It seems like I am constantly getting a large amount of noise (200-300mv) on my oscilloscope waveform ...