Hi, my name is Luís.
I have a Magnetic Field Frequenc 73 kHz pulsing AC field.with pulses occur approx. 3% of the time.
I can use the MLX90395 ? any problem ?
HI Luis, thank you for using techforum. I am sorry, since you have a magnetic field pulsing 3% of the time, it might be a complication for using this type of sensor. MLX90395 uses a Magnetic Node circuit to decode the absolute position of any moving magnet. Not real sure if this can work in your application. You would need to check out the data sheet for the specifications. You can access and download the data sheet from this link. https://www.digikey.com/short/z0833r Glenda
Hi Luis,
Glenda is correct that the MLX90395 is not suited to your application. Not only is it designed for positional output rather than field strength measurement, but its bandwidth is nowhere near capable of reading a 73kHz signal.
You haven’t mentioned anything about field strength, but I have narrowed down the list of sensors to those whose bandwidth could likely handle that frequency of magnetic signal to the following parts:
Do you have any suggestions on which sensor to use?
Hi Luis,
Well, it depends. That’s why I gave you a list of options.
- What is the nature of the magnetic field you are trying to sense?
- What is the minimum and maximum field strength you expect to see at the sensor’s position?
- Do you need to sense that field strength in more than one axis?
- Are you trying to measure the field strength or merely detect it’s presence when it exceeds some threshold (analog output or On/Off output)?
- What device is going to read the output of the sensor?
- What is the purpose of this sensor (the application)?
Answers to these questions should help to narrow down your options.
What is the nature of the magnetic field you are trying to sense?
What is the minimum and maximum field strength you expect to see at the sensor’s position?
- Magnetic Field Frequency: 73 kHz pulsing AC field. Magnetic field pulses occur approx. 3% of the time.
Magnetic Field Strength: negligible.
Maximum Current Draw: Less than 16A. It is not a constant draw with a magnetic field pulsing at3% of the time.
Current draw between pulses is very low and the overall current draw is low. The average current is less than 0.5A.
Operating Temperature Range: -30°C to + 55°C; -22°F to 131°F
Do you need to sense that field strength in more than one axis?
- X,Y,Z
Are you trying to measure the field strength or merely detect it’s presence when it exceeds some threshold (analog output or On/Off output)?
- measure the field strength
What device is going to read the output of the sensor?
- uController ESP32-WROOM-SE
What is the purpose of this sensor (the application)?
- Detect a magnetic field emitted by a generator positioned on a mobile machine
Hi Luis,
The only 3-axis sensor we carry which can handle that frequency is the HMC1053. However, it requires external signal conditioning to amplify it sufficiently for the ESP32-WROOM to measure. Additionally, since this sensor is very sensitive (primary application is sensing Earth’s magnetic fields), it would likely saturate if placed in close proximity to the magnetic field produced by a high frequency 16A current, and it would likely pick up other magnetic fields, such as Earth’s field, if moved far enough away to not be saturated by the field you are trying to measure.
Since I don’t believe we have any 3-axis sensors that would likely work, you might consider using one to three of the EQ731L analog Hall sensors.
It has a bandwidth of 210kHz and can operate on a 3.3V supply. You might be able to get by with only one of these if you have a fixed orientation relative to your current carrying wire.