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50 W = 400 mA / ACS756 output = 16 mA
100 W = 830 mA / ACS756 output = 33 mA
150 W = 1.240 A / ACS756 output = 49 mA
190 W = 1.56 A / ACS756 output = 61 mA
Don't confuse the poor guy. The data sheet states the output is biased at 2.5V with no input current, and the figure on page 8 clearly shows a plus and minus output voltage around the 2.5V bias for a plus and minus input current.Measure the output of the ACS756 as it should be a DC level proportional to the AC current. I don't get why rectify it?
Don't confuse the poor guy. The data sheet states the output is biased at 2.5V with no input current, and the figure on page 8 clearly shows a plus and minus output voltage around the 2.5V bias for a plus and minus input current.
That is not correct. The output with an AC input is AC around (riding on) the 2.5V DC pedestal. Look again at the graph on page 8.Yes, and the output voltage is DC, I am sorry and wasn't trying to confuse him. My point was that the output is not AC but DC proportional to the current. Sorry if that was confusing.
[U]0 mA[/U] [U]400 mA[/U] [U]830 mA[/U] [U]1.24 A[/U] [U]1.56 A[/U]
[U]Vrms [/U] 2.44V 2.44V 2.44V 2.44V 2.44V
[U]Vmax [/U] 2.48V 2.48V 2.54V 2.56V 2.58V
[U]Vpp [/U] 60mV 120mV 160mV 200mV 220-260mV (fluctuating)
The output with an AC input is AC around (riding on) the 2.5V DC pedestal
That is not correct. The output with an AC input is AC around (riding on) the 2.5V DC pedestal. Look again at the graph on page 8.
You can use a series capacitor and resistor to ground, to AC couple the ACS756 output, which will block the 2.5V DC before you rectify it. That way to don't have to null that value from the ICL7107. The RC time constant of the coupling circuit should be 25ms or longer for accurate coupling of the 60Hz AC.It looks like AC voltage on top of the 2.5 Volts. So what I understand from this is I should set the ICL7107 to display 0 when it is input-ed 2.48 V and adjust the values from there on?
I would like to test 10 Amp, anything better than 12 x 100 Watts light bulbs?
Mike
Ok I will try this.You can use a series capacitor and resistor to ground, to AC couple the ACS756 output, which will block the 2.5V DC
I do have a bunch of appliances but I was hoping to find a solution to get exact values from 1 to 10 Amps to test and compare low to high range but I guess I can deal with light bulbs.Do you have a space heater, toaster, or clothes iron? They all likely take 10A or more.