Questions tagged [probe]

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2answers
81 views

How to measure high frequency with an oscilloscope without loading circuit down too much?

I am experimenting with building a high frequency common emitter circuit shown here. It operates at 144MHz and it should have around a gain of 4. Here is the simulated circuit. I do not have any load ...
1
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2answers
100 views

How do I tell whether if it is my oscilloscope or circuit catching mains 50 Hz?

I see that my oscilloscope has some 50 Hz when the probe only is connected to the oscilloscope, which is normal. But I want to know if my circuit is catching the 50 Hz main from e.g. the power supply. ...
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0answers
52 views

Bed of Nails Test Points

FCT guy thrust into the ICT world. We build our fixtures using only 100mil and 75mil sockets. What are the smallest test points I can hit with a spear probe reliably? Also using the previous sockets ...
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0answers
35 views

Creating large custom shape pads in Autodesk Eagle

I'm pretty new to Autodesk Eagle and trying to design a captive soil moisture sensor probe in Eagle. The shape I'm trying to create is: I would appreciate it if anyone can help me with any advice on ...
0
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0answers
28 views

EMC-BCI. Coil injection and probe were calibrated at 100 ohm

As the title says my coil injection and coil probe were calibrated into 100 ohm loop line Impedance and it resulted an insertion loss (dB) for the coil injection. and transfer impedance (dBΩ) coil ...
1
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2answers
50 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 ...
1
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1answer
48 views

Start firmware with blackmagic probe after flashing

I've got a blackmagic probe and a board with an STM32F412KB microcontroller. Flashing the board works great (and fast!) - but I ...
0
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1answer
30 views

Attenuation in the circuitry of differential vs isolated probes

Using this website as a reference for differential probes: https://circuitcellar.com/research-design-hub/high-voltage-differential-probe/ By Andrew Levido, Circuit Cellar The differential probe is ...
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0answers
72 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 ...
6
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2answers
730 views

What are the differences between a x1 and a x10 osciloscope probe

I've heard pros of x10 probe 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.
4
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2answers
372 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 ...
0
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1answer
57 views

Component recommendation for my PCB (probe)

I have completed hardware and software (on the Arduino platform) for measuring resistance on custom sensors. Now it is time to move away from the breadboard and use my own PCB (I plan to make it on ...
1
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2answers
122 views

What is the name of this wire-piercing probe?

I'm looking to get can bus data without cutting the wires. I would like to know the name of the probe pictured below and where to find it.
1
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3answers
217 views

How to accurately measure 16MHz clock with Oscilloscope

I have a small problem trying to make a 16 MHz signal with a scope with 100 MHz 1 GS/s. I can't seem to be able to read the square wave from the MCU clock, see results on the attached picture. I ...
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0answers
28 views

Enhance sensivity of my magnetic field measuring setup

I have the following magnetic field measuring setup: Picoscope 2204A 16m wounded up bell wire connected to tip and ground clip as search coil antenna Now I want to enhance the sensivity for 50Hz to ...
0
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2answers
77 views

Common emitter bandwidth and probing

I am trying to design a simple RF amplifier for a 1MHz AM signal (for low-power transmission). My modulator (JFET-based) outputs ~...
0
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1answer
38 views

Can a differential probe and regular coax wire be connected safely to only one channel of scope using a tee connector?

I would like to ask if I can connect a differential probe and a coax wire through a tee connector to 1 channel of an oscilloscope, in order to take different DC measurements. The connection topology ...
0
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1answer
69 views

Single ended scope probes on equipment under test which ARE on an isolation transformer

I am using my company's new oscilloscope and I don't want to mess it up. I have searched all of the topics, but nothing tells me exactly what I want to know so I thought I would ask in case somebody ...
1
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0answers
31 views

50 ohm D-dot probe measured with 50 ohm scope

I am attempting to measure the signal from a 50 ohm D-dot probe. The manufacturer says to use a 1M ohm scope but I only have a 50 ohm scope. How do I need to set up my tools correctly to receive an ...
0
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0answers
40 views

How do you use a current to voltage converter to probe a specific part of a circuit?

I want to probe a part of this circuit that I have using a current to voltage converter. Problem is, I don't know if I'm doing it properly. Most current to voltage converters I've seen take an input ...
1
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3answers
206 views

Why adding capacitor to a 10x passive oscilloscope probe

I'm trying to understanding input impedance and its circuitry of a simple, passive oscilloscope 10x probe. From reading Input Impedance of an Oscilloscope and the video EEVblog #453 - Mysteries of x1 ...
1
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2answers
97 views

Magnetic field sensor for oscilloscope

I want to measure magnetic fields with my oscilloscope, so I need a magnetic field sensor / probe. My oscilloscope does a FFT for 50Hz to 2MHz. The sensor should be 3D, because I don't care for ...
2
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1answer
164 views

Does this sensor measure electrical or magnetic fields (with oscilloscope)

I want to measure electrical and magnetic fields of the frequency 50Hz to 1MHz with my oscilloscope. For electrical fields I learned that any bunch of metal will work. For magnetic field derivation ...
3
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2answers
136 views

Oscilloscope alligator clip vs spring noise

I am measuring the the power supply rail provided by a small integrated isolated DC-DC converter taking 5v to 15v. The package looks like as follows: When I measure the output using an ...
1
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1answer
101 views

SMPS Testing: Differential Probes or Common lead and best Grounding practice

I'm testing a Switch Mode Power Supply that is not outputting the required voltage. It's only two prong, hot and neutral, and I wanted to get clarification on the best way to approach measuring the ...
0
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1answer
105 views

How to measure a signal generator with an oscilloscope probe?

I have a signal generator and an oscilloscope. When I connect a plain BNC cable between them, and I generate a square wave, I see the square wave on the oscilloscope with the correct voltage. ...
1
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1answer
78 views

Replacement 100 ohm resistor for differential scope probe? [closed]

I'm trying to use a P7504 ($$$) "TriMode" scope probe, and unfortunately the resistors eventually break. Does anyone have recommendations for a 100ohm resistor that would replace the ones on the probe?...
2
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3answers
222 views

What probe/tip to use to clip into a PCB test point?

I need to have a digital logic analyser connected to a test point of a PCB board I'm developing for. To be clear, I mean the little ~0.5mm hole kind of test points. What kind of probe would allow me ...
2
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1answer
143 views

10:1 transformer 10X oscilloscope probe

Why are transformer based oscilloscope probes not common? It should be possible to put a miniature 10:1 signal transformer at the probe tip, and connect it straight to the 50ohm input of the ...
-1
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1answer
112 views

Current Probe with 1mA precision [closed]

I've designed this circuit for a 1 mili amp precision current probe, what change should I apply to it?
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2answers
74 views

How to make sense of the signal trace of differential signal

I am trying to understand following signal trace picture that is shown on the wiki page of 1553 Bus. The Bus has balanced differential pair wires. As the 1553 bus has differential signals on the ...
1
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1answer
272 views

Can't get Flyswatter2 probe to work with OpenOCD

I've got a Flyswatter2 flash/debug probe from the company Tin Can Tools (see https://www.tincantools.com/product/flyswatter2). Unfortunately, I can't get it to work with OpenOCD. Below is a detailed ...
0
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2answers
73 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 ...
0
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1answer
64 views

Current probe settings and measurement

I am having this Current probe I am using this to measure the inductor peak current. Inductor is rated at 2.05A. Schematics : Input Voltage to the converter during measurement is 7.5V I am ...
10
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2answers
1k views

How this DIY High-Speed Probe doesn't reflect signals?

I am reading The Art of Electronics, page 809 and 810, where they show this probe: Which is a DIY probe, made out of a RG-178 coaxial cable, in series with a 953 ohms resistor. I wonder why the 953 ...
1
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1answer
60 views

How can I implement a differential input for a logic analyzer probe?

I'm currently working on a project to build a portable logic analyzer. There will be 4 input channels to the design, however I was highly recommended to redesign this using a differential input to ...
2
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3answers
183 views

Maximum Input voltage of the DSO shell oscilloscope and TL084

In jyetech forum FAQ they mentioned that DSO shell is capable of measuring up to 50V directly: DSO Shell was designed for low voltage measurement. The maximum input voltage was specified as 50Vpk ...
1
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1answer
318 views

How to update the SWDAP firmware?

1. About the SWDAP probe I bought an SWDAP probe some time ago from L-Tek (see https://www.l-tek.com/web-shop/l-tek-swdap-interface/). It took me some time to figure out the terminology, but I ...
11
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2answers
2k views

Is it acceptable to use decoupling capacitor ground pad as ground for oscilloscope probe?

If one were to probe with an oscilloscope using the short ground spring clip attachment, and use the ground pad of a decoupling capacitor as the ground, would the measurement be thrown off at all by ...
1
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1answer
44 views

Finding out the accuracy of the current probe's measurement

As part of power supply testing we are measuring the current profiles of various regulators. Startup profiles includes current bursts with different current amplitudes and widths. i want to ...
4
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2answers
266 views

Criticism of my differential pH probe design

I finished and tested with buffers this little differential pH probe on a perfboard, it works, 3 points calibration is linear. The ground electrode is a stainless steel rod wired to the GND of the ...
3
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1answer
59 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, ...
0
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1answer
28 views

Probe max voltage (50:1)

I'm preforming some measurements with a differential probe and I'm not sure what is the correct attenuation ratio I should use (measuring about 300 V voltage drop on a varistor, which is a surge ...
2
votes
1answer
130 views

Why do we ground the common probe on a 3 probe liquid level sensor?

I have a liquid level sensor with 3 probes, one us common, the other is for low level and the third is for high level. On the liquid level control relay diagram, I've noticed that the common probe ...
14
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3answers
3k 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 ...
19
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5answers
5k 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 ...
1
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0answers
97 views

Build a high voltage probe to calibrate a 1.5 kV oscilloscope CRT supply voltage

I want to build a high voltage probe to calibrate my 1.5 kV oscilloscope CRT supply voltage. Will just use this probe once to calibrate the scope so I don’t want to spend $200 on a probe and I mind ...
0
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3answers
252 views

AD620 pH probe has a positive voltage offset!

I am a chem eng. but little background in electronics. I'd like to interface a pH probe with an AD620A, the original PCB that came with pH probe was damaged by a current leak in the solution. I made ...
0
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1answer
2k views

Adding a second Y axis to an LTSpice plot

I am new to using LTSpice and am coming over from using Cadence. In Cadence you can add a second Y axis. Plot-> Add Y Axis is the probe pane in Cadence. Is there a way to do this in LTSpice?
1
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2answers
154 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 ...