Hi
I'm working with an ACS712 current sensor.
my problem is here:
sensor's output voltage when it is not measuring is not constant.It varies from 2.3 to 2.5.
but it should be fixed 2.5.
what can i do to make that value constant ?
Please define: "aproximately constant". Is it 5V +/- 1%, 5%, 10% or what?
An ACS712 output voltage is ratiometric to the input voltage, as described on page 9 of the datasheet:
Ratiometry. The ratiometric feature means that its 0 A output, VIOUT(Q), (nominally equal to VCC/2)
If your output voltage varies without any magnetic fields, then your input voltage must be varying too.
Please define: "aproximately constant". Is it 5V +/- 1%, 5%, 10% or what?
An ACS712 output voltage is ratiometric to the input voltage, as described on page 9 of the datasheet:
Ratiometry. The ratiometric feature means that its 0 A output, VIOUT(Q), (nominally equal to VCC/2)
If your output voltage varies without any magnetic fields, then your input voltage must be varying too.
I want to measure the output current of a switching power supply via ACS712.
when the switching power supply is not connected to it's supply (220 volt/50 Hz) i measure the sensor's voltage that should be Vcc/2. but it is not and it changes in a spread range from 2.4 to more that 2.7 .
You didn't answer "How do you measure?". I have to assume that you are using a sufficient accurate measuring method, not a µC ADC, not an oscilloscope that displays wideband sensor noise.
hi ,
i'm also trying to get that cip for some industrial application... Do you have a factory made module or you made the circuit yourself? It's clever to check it's power supply . Personally i encountered the problem that i could not calibrate some sensors supplied from a common SMPS power supply (12v/2A) , instead everything worked perfectly when i used 12V lead acid battery ... so it was an EMI issue in the end. Also it's clever to check somehow near by fields since the cip uses Hall sensor as current sensor. You could try to shield that part of the circuit with some steel plate/box.
Ps: does somebody know where to get those modules from EU region ?