Hi all!!! I have one problem. what after calibration meter in verification meter is CF pulse jumping ?
in 50A - CF pulse error 0.09 jumping to 0.41
this schematic which i use
I have a microcontroller quartz 6 MHz increments and in 3.57 MHz increments ADE does this affect you?
Yesterday I calibrated with the ADE 7953 development board there is also jumping СF pulse? how to understand?
I value in register i use current channel B
VGAIN 8394752 (DEC)
BIGAIN 8004096 (DEC)
BWGAIN 12599040 (DEC)
BVARGAIN 13647616 (DEC)
in 220V and 10A
i read VRMS and IRMSB
I check my registers all is normal values.
What exactly is happening with the CF pulses? You have a constant voltage and current input with a constant CF frequency but then this frequency has an error over an extended period of time or is there a single pulse that comes too early or too late?
After calibration i have in Active Energy CF pulse is 0.09 error with reference Meter! But in the verification in 50-60A CF pulse is jumping. In Reactive energy too.
I remember that you are using a shunt for your application, is that correct? What is the value of the shunt you are using and what is the PGA gain of the part set to?
When you mention 0.09 error is that 0.09% or 9% error? This error at what point in the dynamic range is it, 1000:1? If its 9% then that is very large and there is something wrong even before it is put through the verification.
I am using CT for my application! PGA_IA and PGA_IB is 1! about 0.09 error that is 0.09% error ! in all diapason this error?
If a CT is being used then the PGA settings are good and a 0.09% error is with in specifications. When the meter was calibrated, what was the calculated full scale current input to the CT? (Current input that produces a 500mV wave at the current channel input)
Full scale current in 60A-457mV. 457mV in scale 500mV.
This problem sounds like it's only happening when the inputs are at or close to full scale. Do you have anymore specifics about the issue, for example, have you looked at the register values when the CF error increases greatly? Is the frequency of the CF pulses larger or smaller? Is the error only happening at close to full scale (60 A) or does it happen over the full range?
It would be good to check the inputs to the board (output of the CT) just to make sure the wave is not larger than +/-500mV Peak. Then be sure that energy accumulation register values make sense in order to find where this error is coming from.
In my situation in over the full range error CF pulse? what influences change or jumping CF pulse?
Today i testing rezult
in 5A - CF pulse error 0.07 , -0,07, 0,00 , 0,14, 0,35
in 20A - CF pulse error 0.07 ,0.28 ,0.21, 0.42 different rezults
Could you send a schematic of your circuit?
It would be good to check the calibrated register values to be sure that they are set to the same value as found during calibration.
I am also facing a similar problem. I am using ADE7953 for meter design. I used a CT with center tapped burden resistor and I measured the voltage with a single ended configuration where the neutral is connected to ground and phase is connected to Vp through three 330k ohm resistors. I calibrated the meter at 220V 10A unity p.f. load. When I put the meter on testbench, initially CF pulse error is shown 0.03% but with time the error increases to 0.7% or 0.8% in same load condition. Can you guess what might cause this problem?
Thanks in advance
Are any registers being changed during this time? Or for example, is the meter being powered off and then back on again between the two runs of the CF test? If it is, are all the calibration registers being written correctly?
What is the CF pulse rate of the meter and how many pulses do you look at the error over?
Does this error in the frequency fluctuate or does it just keep on increasing if you test it again later?
With the meter setup and constant inputs the CF pulse rate should not be changing with time, have you verified that the inputs really do stay constant between the two CF accuracy runs?
what other settings affect the jumping errors?
I apologize for the late reply. I've looked at your schematic to try and figure out what could be causing the CF output to deviate so much and I have a few questions.
What is your CF frequency at 5A? at 20A?
How are you calculating the frequency error? How many pulses do you wait for and are you comparing it to the reference meter? Where are you measuring the CF pulses, directly at the CF output?
This answers will greatly help in finding the problem.
I also designed an energy metering device with ADE7953. Looks like I am facing the same problem as yours. I calibrated my device at 220V 10A unity power factor. When I put the meter on my testbench, CF pulse error initially shows 0.03%. But as time goes on, CF pulse error increases to 0.7% or 0.8% in same load condition. Could you identify your problem and solve it? If yes, please let me know what caused your CF pulse to vary that much.
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