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

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2
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1answer
101 views

Pulling the circuit's voltage to the ground with grounded probe

When measuring a point on an isolated circuit board with my grounded oscilloscope, I fear my oscilloscope ground will pull the measured point to ground level but this has never happened, I am always ...
3
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1answer
44 views

Should I connect ground for differential measurement with oscilliscope?

Suppose I need to view voltage between two arbitrary points of a circuit with an oscilloscope. For that I can use two probes and A-B math, but should I connect the ground lead to the circuit? How to ...
0
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2answers
32 views

Input impedance of oscilloscope and BNC terminator

Assuming an oscilloscope has the input impedance of 1MΩ, you could adjust it to 50Ω by using 50Ω BNC terminator. And I think you could do the same thing by just changing input impedance option in the ...
0
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2answers
123 views

Power cord without ground cable

Ground cable was ripped from the power cord of most expensive oscilloscope in the lab . Neutral and line cables are stil there . Do you think this is done on purpose ? if so , why ?
0
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1answer
27 views

Oscilloscope training resources

I would like to learn to use an oscilloscope properly. I used them a few times at school, but that was a long time ago and I've forgotten most of what I learned about their use. I'm now working with ...
9
votes
1answer
1k views

Capacitor discharging theory vs experiment doesnt match

I am trying to discharge my 1F capacitor over a 47 ohm resistance which i connected in parallel with the capacitor . İ have calculated the time it would take to discharge from 5V to 4V as 10.55 ...
0
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1answer
51 views

will there be any difference between the output of a 555 oneshot and one made with a 74123?

I think there won't be any difference because the professor wants us to build both with 10 us pulse and with a duty cycle of 25%. I didn't have enough time to build both MMV, so that's why I am ...
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vote
2answers
78 views

Oscilloscope probe measure squarewave

As I was trying to validate our pcb design, I measured the impedance matching on the digital transmission lines, and got stuck with the oscilloscope not showing what I expected. We are using the ...
0
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1answer
50 views

Duty cycle and electronic circuits

A function generator with an internal resistance of $$50\Omega$$ is set to produce a 1kHz square wave with $$20v_{p-p}$$ The duty cycle is 80%. The signal is run through a $$50\Omega$$ resistor. I ...
3
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1answer
70 views

What frequency should an oscilloscope be rated at to measure USB signals

I'm trying to understand how I can figure out the minimum requirements of an oscilloscope in order to measure for example USB 2 full speed signals at 12mbps. I know it's not safe or correct to say ...
0
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4answers
103 views

reverse engineering a serial protocol with a scope

In lieu of a serial capture device are we able to look at the output of an rs-232 feed and correlate what we see on the scope with ASCII/hex representations (do certain voltages tend to correspond ...
-1
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4answers
101 views

Are there any alternatives for a cathode ray oscilloscope

I am conducting a few basic electronic experiments at my home. To measure the variables of these experiments, I need to analyze their input and output wave forms. This would require a cathode ray ...
0
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1answer
89 views

Oscilloscope ground oscillating [closed]

I turn on the oscilloscope, work a little, then I remove the cables and after a while when I want to use it again, I notice the ground has moved 0.4 or 0.6 V upper or lower than it was half an hour ...
0
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1answer
51 views

Power at the differential output

I was measuring the voltage at the intermediate frequency output of this tuner http://superkuh.com/gnuradio/R820T_datasheet-Non_R-20111130_unlocked.pdf using the oscilloscope. The tuner has a ...
0
votes
4answers
113 views

What analog circuit i should use to shifting a signal from -5..5v into 0..10v? [duplicate]

I want to output my circuit from -5..5v into 0..10v. My circuit generate -5..5v. What should i do to generate that signal? what analog circuit i should use? thanks
0
votes
1answer
35 views

Find the inductance using function generator, oscilloscope, capacitors, resistors, multimeter, voltage generator

I am trying to find the inductance of a inductor. I have tried many different methods such as putting the inductor in parallel with a capacitor to form a tank circuit and in series with a resistor ...
1
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2answers
53 views

Which oscilloscopes can reliably measure losses in an inverter for an AC motor?

For my next project at my workplace I am looking for an oscilloscope which gives me good support in measuring the losses in one of the half-bridge switches over one commutation period. The last time I ...
1
vote
1answer
56 views

How can I calibrate my sound card based oscilloscope?

I'm using Soundcard Oscilloscope software that presents as below You'll notice that the display has a grid, and in the example is set for 100mV/div. Since it's using the sound card integral to my ...
10
votes
4answers
596 views

Why did my oscilloscope hookup trip my RCD?

I was attempting to investigate an SPI interface on a power line meter (typical model that measures Voltage, Frequency, Amps, Watts). I opened the module and found the SPI pins broken out. So I ...
3
votes
2answers
57 views

Is the measurement accuracy of a test instrument consistently the same?

Let's say, for example, an oscilloscope (could be a multimeter, power supply, or other type of equipment) has a voltage tolerance of +/- 3%. I input a signal with a known voltage and determine this ...
0
votes
1answer
66 views

Oscilloscope malfunction: Can someone help with a diagnosis?

This is the screen on my Tektronix 2465 oscilloscope when I power it up. It used to have the lines going all the way across and and when I would connect the probe to the stereo output (as a ...
0
votes
1answer
39 views

How to evaluate equivalent 'samples per second' from Time base value?

The following is from Tek DSO manual about the Time base and sample rates. When i turn the knob further, i am able to read values like M 100ms or M 250ms. What woud these evaluate to in terms of ...
1
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0answers
44 views

Inverting op amp gain using high value resistors and using oscilloscope measuremnts

I built an inverting op amp circuit as shown in above figure using varying values for Rf and Rin. When I used Rf=10kohm and Rin=100ohm, my measured gain (using national instrument's virtual ...
2
votes
1answer
42 views

Ungenerated Voltage across the DMM and random spikes across the Oscilloscope

I am working with piezoelectric material known as PZT-P-43 MY PZT datasheet (please look at the red outlined). So far I have been trying to find the Energy that is being delivered to my 100uF ...
1
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0answers
48 views

Frequency of Natural Resonance with Parasitic Component due to Oscilloscope

So, I've just performed a lab on measuring the resonance of an LCR circuit. I rearranged the circuit so each time the component in question had one lead on the ground plane, and then measured it's ...
0
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0answers
57 views

clock frequency too high

I have wired up the clock generator below. However, when I attempt to measure the frequency with an oscilloscope, it is far too high and quite unstable. The measured frequency ranges from 12-50 ...
0
votes
1answer
35 views

Changing the data logging rate on a Tektronix DSO

Currently, for a continuous waveform, i am able to log data from the Tektronix TBA 1064 DSO as .csv files. The time interval between two samples currently is around 4 * E-08 (by default). My ...
0
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1answer
61 views

Non-rectified Voltage output across the capacitor

So I am testing my PZT Piezoelectric material's Voltage output across a Capacitor of 1000uF after converting AC to DC using an Oscilloscope. Oscilloscope model: Gwinstek GDS-2102. The diagram is my ...
5
votes
2answers
116 views

How is a 50Ω “back-termination” accomplished on a scope probe line?

I've just been watching Jim Williams' very excellent video on Measuring Switching Regulator Noise. At 1:58 Jim mentions a "50Ω back termination" in the probe setup that looks something like this (but ...
0
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2answers
52 views

TIP-Barrel test of oscilloscope

I am trying to measure the noise at the output of my buck regulator. I am getting some ripples. I feel that the ground loop caused by my oscilloscope GND ref might have a small impact here. I was ...
0
votes
1answer
75 views

Pic18f4550 oscilloscope

I've built a simple pc oscilloscope using pic18f4550 and a 20 MHz crystal. I've made a simple application using vb2010 which is able to show the frequency oscillation on pc. The problem that I have ...
2
votes
1answer
132 views

How to measure supply currents ranging from 1μA to 10mA?

I’m building a battery powered data logger with a microcontroller and several sensors. I’d like to measure the supply current of individual parts with idle currents in the μA range and peak currents ...
1
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3answers
299 views

calculating the average power using the oscilloscope

I am trying to measure the real power of an inductor, and in the manual it is said that I have to connect a resistor with low resistance to the inductor and then see the voltage difference between the ...
7
votes
2answers
120 views

Does it ever make sense to use a 50Ω input with 10X scope probe?

I'm at the point in my learning where one discovers measurement setup for a scope at RF frequencies is quite a bit more involved than I thought :) I see the importance of thinking about the probe + ...
5
votes
1answer
261 views

How to connect the oscilloscope to a circuit

I am learning how to use an oscilloscope and I have just seen this picture in my textbook: I'm not very sure, but I think the arrangement of the probes is incorrect. Isn't the alligator clip ...
0
votes
1answer
59 views

How to measure a dc or ac signal using PC as oscilloscope?

I want to measure for ex a battery 0.7V dc using a program like Visual Analyser/Soundtrack Oscilloscope/jDTF/Scope/xoscope. I connect the negative pole of the battery to sleeve and the pozitive to ...
3
votes
2answers
103 views

Portable 5v power supply to duplicate wall wart

I've got a wifi device that works off of a 5v 2a wall wart. I need to walk around with it to get some signal strength ratings, so I am making it a portable power supply. However, the device won't ...
2
votes
1answer
66 views

Differential measurements with high voltage oscilloscope probes

This interesting post about differential measurements with a scope has raised a few questions in my mind. I have read about true differential scope probes and they seem to be very expensive. Would ...
0
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3answers
76 views

Shorting probe tip to ground

What is the effect of connecting the tip of an oscilloscope probe to a ground lead? Here is one of the few links that I've found that shows the set-up: The Shorted Scope Probe. What are the possible ...
1
vote
3answers
54 views

Nature of analog channels on digital/mixed oscilloscopes

Can someone please help with scope terminology? Some scopes have "analog" and "digital" channels. Am I right in thinking that the "analog" channels are in no way similar to the old Tektronix 475 I ...
8
votes
4answers
727 views

DIY Oscillosope probes

I am interested in making my own cheap (somewhat disposable, or permanently attached to prototypes) probes for my oscilloscopes. In complex circuits, and dense PCBs sometimes it may be difficult to ...
1
vote
1answer
108 views

IR2110 - measuring Vb to Vs kills MOSFET

I got a new digital oscilloscope as a gift. As a training course, I observed some waveforms of my test 12V full bridge circuit that is driven by TL494 and two IR2110 operate the IRF3710 100V mosfets. ...
5
votes
1answer
768 views

Using Oscilloscope So That Nothing Blows Up

I want to see the input current waveform of an LED T8 18W. An EM ballast is purposely placed in series with the lamp. I don't have a power analyzer. What's available is a GDS-2102 oscilloscope. So I ...
1
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2answers
180 views

Which one is more accurate: Digital oscilloscope or Analog oscilloscope?

I know it is some sort of wide question, but nowday I usually only see digital oscilloscopes around. I want to know if their digital nature will affect the accuracy of measurements? (Something like ...
1
vote
0answers
125 views

Oscilloscopes - Comparing Traces

I'm new to Oscilloscopes and so this question may be a simple one. We have a Rigol DS1104Z Oscilloscope and would like to compare the same point in the circuit at different times as the voltage ...
6
votes
2answers
135 views

Probing with Oscilloscope Stops ADC Fluctuation

I've gone back to my constant current project to fix an annoying fluctuation in the required current display. See schematics below. The entire circuit consists of a CCS section with signal outs for ...
1
vote
3answers
124 views

Would you prefer a voltmeter or a scope when measuring average voltage precisely?

As far as I understood the DC setting of a voltmeter or a multimeter is measuring the average value of a periodic voltage signal(not rms but the average value). On the other hand, an oscilloscope as ...
3
votes
2answers
99 views

DIY DC Blocking Capacitor for oscilloscope

I'm studying switching converters and want a bench setup that will allow me to reliably observe the various voltage waveforms (output, inductor, switch) on my oscilloscope. I discovered pretty ...
3
votes
1answer
128 views

Would you explain the output waveform of this FM transmitter circuit?

I build this circuit and it works. I wanted to look at the output waveform by my soundcard oscilloscope software. I would expect something like the following picture: But the output waveform was ...
5
votes
2answers
263 views

What is the impedance limit for using 10X probes with oscilloscopes?

I thought 10X probes are only used for impedance matching at high freq. circuits. But I read in a text that they are also used in high impedance circuits to prevent loading. But isn't a scope's input ...