Questions tagged [frequency-measurement]
Anything related to the measurement of the frequency of periodic signals, i.e. the rate at which their waveform repeats along the time axis. The S.I. unit for frequency is **hertz [Hz]**.
230 questions
7 votes
3 answers
1k views
Can 2-wire measurement reach 4-wire precision?
I recently came across the TIDA-060029 documentation from Texas Instruments (auto-balancing impedance measurement), and I’m not fully sure whether the method used in that design is 2-wire or 4-wire. ...
- 305
1 vote
0 answers
119 views
How do I connect a PLL sensor on transformer output with two secondary windings to a diode rectifier load?
Background: I am working on a project of modernizing a system for a lead acid battery charger. I will do this with a Vienna rectifier, that needs the current angle, that I get from a PLL, for control. ...
- 123
3 votes
3 answers
168 views
Why does ESP32 smooth a 10us square wave?
I am generating a square wave using a CMOS chip running at 12 volts, the time period is 10us, I can see the square wave is perfect on the scope. Now when the square wave is sent to ESP32 using a ...
- 315
1 vote
1 answer
64 views
What is the best strategy for measuring high voltage AC signals with microcontroller?
I have an AC waveform that can rise to about 120V peak and 10A at a variable frequency between 50-150kHz. I would like to use something like an optocoupler to scale this voltage to something logic-...
- 151
0 votes
1 answer
88 views
Gate driver Infineon 2EDL05N06 series shutting off intermittently at higher frequencies
I have built a half bridge resonant inverter using the Infineon 2EDL05N06 series gate driver (datasheet) and power MOSFETs, and it seems to be generally functional. I am controlling the gate driver ...
- 151
1 vote
4 answers
153 views
How to detect PM rotor frequency and direction, with uW scale consumption?
I am looking for solutions to detect the rotational speed and direction of a permanent magnet rotor. I thought this would be easy, but every concept I considered falls short somehow... Does an off-the-...
- 559
2 votes
2 answers
163 views
Is it possible to measure spindle rpm with DMM(Hz option)?
I read a comment (on other forum) about how to measure a spindle rpm with a certain tool, which doesn't make sense to me. This was the comment: ...Before I had a tool to measure spindle rpm, I’d use ...
- 321
1 vote
1 answer
163 views
Antenna for RF frequency counter to make it wireless
I am experimenting with RF oscillators and transmitter circuits in the 1-150Mhz range. To measure output frequency, I am using a 1-500Mhz frequency counter 5-9Volt module: Note that the frequency ...
- 177
0 votes
2 answers
157 views
Divide GHz frequency down to 10kHz with programmable divider
I am looking for a good way to divide a high (50MHz - ~1.2GHz) frequency down to a low frequency of ~10kHz for use in a precision timing circuit (The divided signal will be timed using a 10ps TDC chip)...
- 219
1 vote
2 answers
93 views
Alternatives for a Quartz-crystal microbalance holder
I am building a kind of frequency analyzer as a side project and don't have the money to buy a high-end QCM sensor holder (image below). I'm not really even sure how to connect these sensors to my ...
- 11
4 votes
2 answers
307 views
How to convert current directly to frequency in the simple 555 frequency meter
So I'm working on an audio project, and I need a built-in frequency meter (for tuning the instrument, basically, so the range is like 50 Hz - 5000 Hz with an required accuracy around 1 Hz). I see a ...
- 191
0 votes
0 answers
79 views
How do I use alligator (crocodile) probes? [duplicate]
When measuring with an oscilloscope, I use an original high frequency oscilloscope probe and a double side crocodile (alligator) clip and the results are usually very close. Note: it is called ...
- 69
2 votes
0 answers
268 views
What frequencies can crocodile (alligator) probes carry?
When measuring with an oscilloscope, I use an original high frequency oscilloscope probe and a double side crocodile (alligator) clip and the results are usually very close. Note: it is called ...
- 69
0 votes
1 answer
196 views
RF jammer module power measurement using a spectrum analyzer
I have an RF jammer module that works at 2390-2510 MHz. The voltage is 24-28 V and it can transmit up to 50 W. When I use a spectrum analyzer, the value is around -20 dBm. If I'm not mistaken, -20 ...
- 55
1 vote
2 answers
329 views
Understanding dBm value of FFT measurements
I am getting familiar with the FFT functionality of my oscilloscope. I am using a Siglent SDS2204X Plus that has been firmware upgraded to 350 MHz. Testing of the FFT function involves the use of a ...
- 137