Questions tagged [probe]

A physical device used to connect an electronic instrument (such as an oscilloscope) to a circuit in order to measure quantities such as voltage, current, temperature, etc. Use in conjunction with related tags such as "oscilloscope", "voltmeter", etc., as applicable.

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Why there is a need to trigger to see Crystal frequency with persistent screen ? Why can't continuous run mode of scope does the overlap correctly?

Thanks Guys. I think I did not explain my question correctly. Getting dumb day by day. I am probing SMD 25MHz XO output with 500MHz probe. When my Scope is in continuous run mode, I see my persistent ...
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Dark Green Probe in Orcad Capture/Pspice 17.4

I am running into this consistently odd behavior and I was hoping someone had some insight on what it means, my searches have been fruitless so far. Sometimes when I try a transient analysis and try ...
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My Wien bridge oscillator doesn't work, what could the problem be?

I suspect I am making a probe connection mistake, but couldn't figure it out. The circuit works fine in LTSpice but I don't get anything in a real experiment. What might be the problem?
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How to probe UART pins of a phone?

I'm gonna try to probe this phone for UART pins: https://www.youtube.com/watch?v=scsAlvMie1M I have a cheap logic analyzer and just bought really pointy probing pins (waiting to arrive), I also have ...
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How does a CAT 4 radio detector work in passive mode?

According to https://www.radiodetection.com/sites/default/files/Theory-Buried-pipe-manual-V10.pdf in passive mode a CAT 4 radio detector 'looks' for harmonics produced on the 50/60Hz mains buried ...
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Total impedance of scope probe

I would like to measure the total impedance of the scope + 20:1 attenuator + x1 probe EDIT: Circuit modified according to Bruce Abbott's recommendation My scope's input impedance is : 1 MΩ ±1%, in ...
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What is this oscilloscope accessory?

I have access to a FLUKE 190-504 SCOPEMETER oscilloscope. The following picture shows one of its probes. I don't know the circled accessory in the above picture. I ...
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I am having trouble measuring the amplitude of a 97 MHz signal with an oscilloscope with a bandwidth of 100 MHz

First, I designed a Colpitts oscillator with a frequency of around 94-97 MHz. I added a common emitter amplifier to the design to increase the output amplitude of the oscillator, then I connected the ...
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Oscilloscope "isolated" inputs

As I don't want to see my oscilloscope go up in flames when I play with probing circuits, I was wondering the following: First off, my goal is to measure different floating voltages aka the "GND&...
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Auto-range test probe circuit

I've got a digital oscilloscope that can handle a maximum of 5V. On numerous occasions, if I know the range of a voltage, and it is above 5V, I have made simple voltage divider circuits to take ...
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Test/programming rig with spring-loaded probes/connectors

I have ESP32-CAM module with two rows of 0.1" male pins. The pins are 0.22" high. Here is a picture: I would like to trim them, so they are too short to mate with the corresponding female ...
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High-voltage oscilloscope probe

I need to measure a high-voltage signal (1kV) with an oscilloscope without a commercial high voltage probe. So I have to design my own 100:1 probe. The oscilloscope has an input impedance of 1MOhm and ...
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Getting the same value from a pH Probe

I am totally new and looking for some advice, please. I am trying to connect a pH Probe (PH-4502C) to a Wemos D1. I believe to have wired this up all correctly, I have wired the PO pin to the A0 pin, ...
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When does a x100 2000V scope probe not work at 2000V?

I refer to this X100 scope lead, and to this relevant question & answer for that product: Q: According to the 4100 user's guide the voltage rating at 10 MHz is only 100 V. shouldn't it be 2000 V ...
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What is the point of the following capacitors?

Sorry if this question is dumb, I'm still a student... Anyways, I was looking at a design of a high voltage differential probe on the web and was wondering what is the purpose of the capacitors seen ...
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Guidance for making wide-bandwidth X1 scope measurements

I am making current measurements from a current-limited power supply. I'm currently using a 0.10 Ohm shunt with a X10 scope probe connected directly across the shunt. This connection uses the ...
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Questions on building probe station and pulse measurement

I don't have a strong ECE background, so I may ask many naïve questions. I am building a probe station to measure pulses in a micro-coil, which looks like the following circuit. Because I want to ...
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Does the circuit troubleshooting tool used in 2001 A Space Odyssey exist in the real world?

In the well known science fiction film 2001 A Space Odyssey there is a scene in which Bowman and Poole are trying to locate the fault in the AE-35 unit. If memory serves, they use a tool which allows ...
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Connect probe properly to measure 230 VAC with oscilloscope

I just got this combined multimeter - oscilloscope Hantek 2D72  Link to manual: https://www.circuitspecialists.com/content/476383/HANTEK2D72_Manual.pdf&ved=...
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What is the technical name for the "cap" on the multimeter probe's banana plug (or socket)?

Unlike the test leads that come with most portable, pocket size multimeters, the benchtop multimeter's test probe I had has a "cap" that sits tightly on and covers the banana plug. I'm ...
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Alternative way of measuring characteristic current through diode in LTSpice without using current probe

I'm new to LTspice so I would like to have a few ideas. Here is a circuit: Basically, the output of BLOCK_1 is a small triangular waveform. I need to pass this output through a 1N4148 diode which is ...
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How to accurately measure ~1 A on 3-30 MHz?

I would like to measure the efficiency of an HF (3-30 MHz) class C power amplifier. In order to do this, I have to accurately measure AC+DC RMS current in the order of 1 A or so. Most instruments are ...
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Update --strange interaction while probing circuit

I'm encountering strange behavior from this Colpitts oscillator circuit when I probe what is an "isolated" output. Probing an isolated output is causing another otherwise good output signal ...
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Probe specific performance on oscilloscope - offset

I have been having a weird unexplainable issue with my set-up. I am currently testing a flyback converter with a current sense source resistor. The scope shows a DC offset when using two different ...
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High voltage ripple measurement using a 1000:1 probe

I am measuring the DC voltage ripple at 400V provided from CAEN DT5534EM by connecting the output to the oscilloscope (AC coupling) through a 1000:1 probe. From the picture below, the ripple is around ...
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Oscilloscope impedance mismatch issue

We have connected an oscilloscope and a function generator using a connector plate. We have terminated the signal connections from the oscilloscope & the function generator to the connector plate ...
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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 ...
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5 votes
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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9 votes
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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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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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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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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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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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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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