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

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3answers
81 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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0answers
37 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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0answers
12 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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0answers
23 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
204 views
+50

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
79 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
80 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
91 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
55 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
97 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
159 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
67 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
70 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
79 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
91 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
88 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
64 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
228 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
58 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
117 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 ...
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1answer
147 views

Oscilloscope ground and unit under test ground issue

I am working with an instrument which has a supply of 230V AC or 400V DC. AC source is isolated at the input via 1:1 transformer and DC source is a floating supply. I have a Yokogowa DL1620 ...
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0answers
93 views

What causes this FFT artifact in my DSO?

I am curious what causes this (apparent) transient anomaly in my DSO's FFT display. The pattern is easiest to see if I ground the probe tip to the ground clip. Then the time display is only a solid ...
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3answers
161 views

Getting the right frequency from an oscillator circuit

I have constructed an oscillator circuit using the resistor and capacitor values shown in the diagram above (from the Proteus ISIS simulator). I run the circuit and use a switch to trigger the ...
2
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1answer
47 views

Gas Discharge V-Q Lissajous

I've been investigating non-thermal plasmas, specifically dielectric barrier discharges, where two electrodes, at a potential difference of several kilovolts, are separated by a dielectric and a gas ...
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1answer
71 views

Nature of noise gotten from digital oscilloscope

I've got strange noise while using digital oscilloscope (Auris B-424). Spectrogram of this signal presented on this image: (X time in seconds, Y frequency in Hertz, in this image case from 0 to 50 ...
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2answers
121 views

Measure 230V mains with 300V CAT II probe?

I need to measure harmonic distortions on a 230V 50Hz AC mains circuit. The Tektronix P2220 probes I have for my scope are rated for 300V CAT II when set to 10X impedance. Are these probes safe to use ...
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2answers
195 views

Can an oscilloscope add a frequency component to my signal?

I want to check the spectrum of a DDS signal ("pure" sinewave) for undesired frequency components. The way I am doing it is by storing the waveform from a 2GS/s oscilloscope (Agilent DSO81204) and ...
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2answers
81 views

the circuit of active probe using FET trace CRO [closed]

pls suggest the circuit of active probe using FET trace CRO.
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2answers
88 views

Continuously log data from an oscilloscope

I have a pin which is being toggled every 100ms by an MCU. I need to plot a graph which consists of the variation from the desired interval . That is the number of times it moved away and was toggled ...
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1answer
127 views

Capturing PWM Signal on an Oscilliscope

I have a stepper motor that is controlled by PWM. I am trying to analyze the signal coming out of the controller on an oscilloscope. Ideally, I would like to capture, maybe 2 seconds of wave form so ...
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3answers
797 views

Why does an oscilloscope show a different voltage from a signal generator?`

I have a Rigol DS1052E oscilloscope and a Rigol DG1022 function generator. I have just changed the oscilloscope fan for a silent one, as I found, as is commonly reported, that the original fan noise ...
2
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1answer
61 views

How to store more waveform after trigger and less before?

I have a Rigol DS1074Z and can't figure out how to lower the time the scope spends pre-sampling to open up more memory for the actual data I want to see. Here is a nice image that will hopefully ...
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2answers
105 views

Eye diagram test

I am trying to perform a eye diagram test on a device to check its USB performanance. I am using a board "SQIDD" in order to perform this test. The following figure shows my test setup, I am using ...
4
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2answers
502 views

Why does reversing the oscilloscope probes cause ringing in the signal?

I am measuring a PWM signal in an oscilloscope using probes with a 1X and 10X switch (active?). I'm measuring across a resistor which is in series with an LED which is driven by an NPN 2N3904 ...
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1answer
253 views

How to calculate RMS of total noise from digital Oscilloscope (FFT)?

Only the red channel is in consideration. The yellow curve is not relevant, which is only another channel of the oscilloscope. The image above was captured from a digital oscilloscope. The vertical ...
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3answers
179 views

Designing a test instrument to be connected to an oscilloscope

I'm working on a piece of test equipment that is intended to be hooked up to an oscilloscope to measure the waveforms it produces. Since that's its reason for being, I figured it made sense to provide ...
4
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3answers
2k views

What will I see in oscilloscope when attempting to analyze Bluetooth or Wi-Fi signals?

I would like to know what will show up if I put bluetooth or wifi carrier signal (2.4GHz family) in a say 50MHz oscilloscope? Am I going to see something like a rectangular block? And the only ...
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1answer
89 views

See if signal is amplified without an oscilloscope

I'm an electronics newbie, but I've had some experience with oscilloscopes in college lab. However, I need to design and wire a simple circuit that can read values from an electret mic. Since the ...
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5answers
248 views

Can I see an analog signal with changeable frequency on oscilloscope?

I have a sinusoidal signal with changeable frequency (which implies that it is not periodic). I wonder is it possible to see it on oscilloscope? Does it show non-periodic signals? As it is apparent my ...
2
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2answers
527 views

A way to measure unknown high voltages with an oscilloscope

I have a sort-of black box of a circuit that is used to generate plasmas. I'm sure it outputs on the order of kV but I'm not sure at all about the current. I was wondering if there is a way to measure ...
2
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2answers
106 views

Obtaining O-Scope signals in a AC/DC supply - grounding issues

I need to check waveforms in the power supply from this design reference by Texas Instruments. I essentially built the supply, but it is not operating correctly - ie, no output current, but it has ...
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1answer
129 views

Put a DAC at the output of FPGA

I have designed a circuit by System Generator to implement on FPGA. The output signal is a sinusoidal with changeable frequency. I need to read the output signal by oscilloscope. I should put a DAC at ...
3
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3answers
118 views

Oscilloscope gear and ESD

The answer might be obvious, but I am curious, how well are oscilloscopes and probes usually protected against ESD? I noticed that oscilloscope probes are usually shipped in esd-protected bags. On ...
0
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1answer
79 views

Make sure this equipment can do what I want (infrared decoding) [closed]

I'm CS but took a digital electronics physics class at my old university and found it really interesting so I wouldn't mind having my own small EE workshop. For my main project I just want to decode ...
2
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1answer
74 views

oscilloscope time charging different from the math

For the above circuit, I calculate that the equivalent resistance of the charging circuit is 2.668 kΩ, and the equivalent capacitance is 2.055 µF. Therefore, the time constant would be ...
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1answer
179 views

TV signal into an Oscilloscope

I'm plugging TV signal cable directly into an oscilloscope. TV cable looks like this: First I connected outer shell of TV cable connector to GND of oscilloscope BNC cable and center to the center of ...
0
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1answer
167 views

BNC cable instead of oscilloscope probe for fixed setup?

I'm developing a device, it will generate a signal that will be fed directly to an oscilloscope, and connected permanently. I now have the circuitry set up on a breadboard, attached to the scope ...
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1answer
84 views

Oscilloscope pulse frequency

I'm measuring pulses from a device with a constant frequency. The oscilloscope's usual frequency indicator shows 600 Hz. But when I use "Measure" button and then Type is set to Frequency, then that ...
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1answer
557 views

why is this oscilloscope so cheap with a 20Gsa/s sampling resolution?

I've looked around this site but I haven't been able to figure out why this oscilloscope seems to have such a high sampling rate "Repetitive mode: 20GSa/S" and be relatively cheap: ...
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2answers
2k views

How to test a crystal resonator in board?

I have 2 quartz crystal resonators in my pcb board: 32.768 kHz & 20 MHz. They are connected to a Freescale MC12311 transceiver IC, which has an HCS08 micro-controller embedded in it. I want to ...