All Questions
11
questions
6
votes
1
answer
402
views
Homemade high-voltage probe not dividing the voltage by proper amount
I have tried to build a homemade high-voltage probe, as commercial ones are too expensive.
Firstly, I connected a 1 MΩ resistor to a ~1.4 V battery which gave an output voltage of ~0.2 V. By using ...
- 325
1
vote
2
answers
185
views
Oscilloscope probe coupling [duplicate]
I am using this buck converter.
Schematic:
Buck Converter Specifications :
Input Voltage - 18V to 32V
Switching Frequency - 300kHz
Output Voltage 9V
Load Current - 0mA to 200mA Maximum.
When ...
user220456
4
votes
2
answers
2k
views
Oscilloscope probe noise
I am trying to measure a DC signal in the mV range.
Below is the waveform I get after I connect the oscilloscope to its probe and without connecting it to anything:
I am getting a ripple like ...
user220456
1
vote
3
answers
5k
views
Probe circuit for measuring higher voltage on oscilloscope?
The only oscilloscope I have is a tiny DSO138 (input section is on the top left of page 4 in the linked PDF). The scope has a limit of 100Vpp (actually displays only 80Vpp). At the highest attenuation ...
- 2,177
0
votes
1
answer
628
views
Why doesn't a passive x1000 oscilloscope probe have 1000M Ohm impedance?
Most of the x1000 high-voltage oscilloscope probes I find seem to have input impedance around 100M Ohm. For example the P6015A from Tektronix (100M Ohm) or the PPE6KV from LeCroy (50M Ohm) or these ...
- 133
3
votes
1
answer
142
views
Distance between 3d voltage probes
I am making bipolar voltage measurements in which the distance between my probes small enough that I think the geometry of the probe contact tips is non-trivial. As illustrated below, my voltage ...
- 43
0
votes
1
answer
188
views
Differential ADC - voltage on probes
I got the EVAL_AD9784_PMDZ and Zedboard reading data. It is differential ADC, 2 probes with 1 common ground. The ground is at the ZedBoard GND level (as expected). The voltage input is +7.5, GND, -2.5 ...
- 177
3
votes
1
answer
528
views
How can I use an oscilloscope to measure voltages that are referenced to nodes several hundred volts apart?
In my organization, we often use four-channel oscilloscopes to check out products. Each probe reference might be several hundred volts away from the others, which makes using standard scopes ...
- 17.6k
3
votes
1
answer
16k
views
Have I broken my Multimeter?
Firstly, I'll answer my own question by saying that I don't think I have broken it.
However, is it possible I could have? (and also possibly, the power supply I was testing).
I am quite new to ...
- 31
0
votes
1
answer
249
views
Unexpected sinusoidal wave at low voltage setting on oscilloscope?
I'm fairly new to electronics in general, and I'm learning to use an oscilloscope.
I have a 10X probe attached to a 1uF capacitor that is completely discharged. When I set the time interval on the o-...
- 717
3
votes
1
answer
9k
views
Using oscilloscope to measure voltage across a resistor
I have a board which is powered by a 5V PSU. I needed to measure the current flowing into the processor for computing power. Since there was no resistor that I could find in the path from the supply ...
- 31