Questions tagged [probe]

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14 views

Wrong AC mains probing or Issue with Diac/Triac?

Note: Solved, I posted my reply/answer I am working on this circuit, where I try to control the fire angle on a Thyristor, using a Diac: simulate this circuit – Schematic created using ...
5
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2answers
301 views

Differential probe input impedance 1Meg, but 50ohm oscilloscope mode recommended

I will be experimenting with the Keysight company's N2792A differential probe. Looking at the datasheet of the probe, the input impedance is 1Meg, but it is said to be used with the 50ohm impedance ...
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3answers
109 views

Is there a standard way to probe SPI without causing data corruption?

When I connect my oscilloscope probes to my SPI lines, the line voltages get affected a lot and so my SPI comms fail. I am using a breadboard as an intermediary between the two devices and adding ...
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2answers
90 views

Why does an overcompensated oscilloscope probe give spikes higher than the input voltage?

Does anyone knows why an over compensated probe gives voltage spikes bigger than the maximum voltage of the input signal (or bigger Vpeaks?) These spikes looks to me like a parasitic inductance but I ...
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1answer
118 views

Oscilloscope design question

To begin with,I am not designig an oscilloscope but am curious about how certain parameters are determined. My questions might sound very trivial but I would be grateful if someone could answer them ...
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3answers
208 views

Probable heat probe malfunction, how do I test it?

Disclaimer I'm not very sure about the stack where I'm suppose to post my question (between here and "Home Improvement" stack.) Question A few days ago my oven started beeping repeatedly ...
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0answers
60 views

Tektronix P6015 Replacement Potentiometer Considerations

I’ve acquired (saved from the landfill) an old Tektronix high voltage probe, model P6015. The probe body and cable are in decent condition, but I discovered two damaged potentiometers in the ...
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5answers
150 views

Soldering connector on PCB to connect to logic analyser or scope

When it comes to digital circuits, it is often important to get certain internal design signals to an I/O pin and then view it on scope. This is in-spite of all the other techniques that exist to ...
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1answer
175 views

What is the PSPICE model of my probe + oscilloscope?

The oscilloscope and probe manufacturer gives me the following input impedance data: Oscilloscope Input impedance/capacitance: 1 MΩ ± 2%, 16 pF ±3 pF Probe characteristics Bandwidth DC to 75 MHz ...
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2answers
151 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 ...
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2answers
110 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
58 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
41 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 ...
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0answers
36 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 ...
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2answers
54 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 ...
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1answer
165 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 ...
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1answer
63 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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75 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 ...
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2answers
2k 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.
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2answers
515 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 ...
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1answer
63 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 ...
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2answers
180 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.
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3answers
477 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 ...
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2answers
87 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 ~...
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1answer
39 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 ...
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1answer
72 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 ...
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0answers
32 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 ...
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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 ...
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3answers
367 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 ...
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2answers
161 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 ...
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1answer
241 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 ...
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2answers
180 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 ...
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1answer
146 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 ...
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1answer
245 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
87 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?...
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3answers
374 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
170 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 ...
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1answer
117 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
80 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 ...
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1answer
379 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 ...
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2answers
76 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 ...
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1answer
84 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 ...
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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 ...
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1answer
75 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 ...
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3answers
255 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 ...
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1answer
415 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 ...
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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 ...
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1answer
62 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 ...
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2answers
326 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 ...