All Questions
Tagged with probe measurement
21
questions
6
votes
4
answers
746
views
Using 50 Ω coax cable instead of passive probe
Preface, why am I asking this question?
Instead of using a passive probe with a ground clip, I want a more "permanent" and reliable connection for my measurements. Note: I'm not talking ...
- 1,029
0
votes
0
answers
52
views
What could be the possible reason for waveform distortion while connecting differential probe GND with single ended probe GND?
I am measuring following waveforms using a DSO:
Case 1:
Waveform 1 wrt GND using differtial probe.
Waveform 2 wrt GND using single ended probe.
Result 1: Waveform 1 distorted.
Case 2:
Waveform 1 wrt ...
- 3,032
0
votes
0
answers
41
views
H - probe design in cylinder cavity
I give both a short description and a longer one below. Any advice on how to design two H-probes system in a cyinder is welcome and many thanks :)
Short description
Problem: I wish to disign where to ...
- 1
0
votes
0
answers
295
views
Bad oscilloscope probe does not measure DC
I seem to have messed up my oscilloscope probe during PCB testing. Too high a voltage was applied and there was arcing between the probe and a pin on the PCB. The probe can still read square waves ...
14
votes
2
answers
19k
views
What are the differences between a x1 and a x10 oscilloscope probe
I've heard pros of x10 oscilloscope probes a lot.
Now I need to know the cons, but I couldn't find a clear explanation.
Some people say x1 probe is for small signal.
How do you decide either x10 or x1?...
- 143
0
votes
2
answers
168
views
Length to make magnetic loop antenna/probe for 1.6GHz?
I'm making a near-field probe to to search for GNSS (GLONASS) blocking signals on my PCB.
According to http://www.eryptick.net/unisold/loop.html the wire length for a loop should be 1/3 the ...
- 377
3
votes
1
answer
157
views
To find theRMS noise voltage in a circuit, can the measured RMS voltage be subtracted from the RMS voltage of shorted probes?
I'm trying to estimate the SNR of a circuit, which includes measuring the noise power of an analog trace. Right now, I'm attempting to measure the noise with a high bandwidth scope probe, ac coupled, ...
- 31
18
votes
6
answers
8k
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 ...
- 505
6
votes
3
answers
6k
views
Oscilloscope: when to use coaxial instead of probes?
I understand the difference between passive and active probes, and between x1, x10, x100, ...
I also understand that at high frequencies the capacitance of the oscilloscope has to be considered, so a ...
- 101
1
vote
2
answers
548
views
How do current probes load a circuit?
It's usual to talk about loading a circuit when measuring voltage, with a voltmeter or with a voltage probe and an oscilloscope. It can be seen as putting an impedance in parallel to the element whose ...
- 1,028
4
votes
1
answer
943
views
How does capacitive coupling work for measurements
The context is the measurement of engine speed on a vintage car that uses a classic Kettering ignition system. Essentially, a voltage pulse of tenths of kV is generated on a high tension (HT) lead. ...
- 329
0
votes
3
answers
5k
views
Measuring differential signal with single ended probe
I have a differential signal(a +/- signal) to measure. Can I use a single ended probe to measure it and then just multiply whatever I read by 2 to get the actual amplitude?
- 719
0
votes
2
answers
206
views
Probes gives different results
I discovered an "funny" thing today.
I had used a GW instek probe GTP-150B-4 150Mhz in 10x mode and documented the result.
Today I noticed in the testing department that what I've measured doesn't ...
- 626
2
votes
2
answers
1k
views
Digital temperature meter probe wire length
I bought a cheap Chinese digital thermometer like this one
with this description Link to product
Item specifics
...
- 21
7
votes
2
answers
5k
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 ...
- 7,172