Hello every one,
I like know, how many represent a change in a bit in Joule (KWh) in the AENERGY register and, how might I calibrated a meter with the ADE7753?
please, can you help me with my question?
1. I like know, how many represent a change in a bit in Joule (KWh) in the AENERGY register and, how might I calibrated a meter with the ADE7753?
2. the datasheet of the ADE7753 show the Test Circuit for Performance Curves with Integrator Off in the page 15, the value for each device in this document was calculated for a Base Corrient of 10 Amp or for how many?
3. LAENERGY, LINECYC, PERIOD y Line Period(s) interest for Calibrat the meter ADE7753 Using a Reference Meter Example or is only important measure CF of the meter ADE7753 and the CF of the Reference Meter. The CFDEN is calculated the same form that in the example of the datasheet en la page 39 and 40, the result will be 957 (with a Vnominal=110V). please, can you correct me if I'm bad. thanks.
3. LAENERGY, LINECYC, PERIOD y Line Period(s) interest for Calibrat the meter ADE7753 Using a Reference Meter Example or is only important measure CF of the meter ADE7753 and the CF of theReference Meter. The CFDEN is calculated the same form that in the example of the datasheet en la page 39 and 40, the result will be 957 (with a Vnominal=110V). please, can you correct me if I'm bad. thanks.
4. besides, can you respond me how do I know the lowest current to be corrected (Minimum Current)?, how do I calculate the Load at Minimum Current and how do I calculate the %ERRORCF(IMIN)? This in the page 43 in the section "Calibrating Watt Offset Using a Reference Meter Example".
The calibration procedure determines the weight of the LSB in terms of real-world values. Calibration is required in a meter to avoid meter-to-meter variations and to convert register readings to real-world values, like KWh.
Below is a link to a discussion that talks in detail about the calibration procedure :
Kindly go over this discussion and let me know if you can understand the calibration procedure better.
Regarding the question about the Typical performance plots, the X-axis shows the percentage of Full scale current in all the plots. So, each plot has data points of lower current levels w.r.t. Full Scale. The primary current corresponding to this, does not matter, because, for the chip, it is always the level w.r.t. Full Scale that is important.
Answering to the question about minimum current, IMIN is the lowest current level that you will need to account for in your application. Your application will probably have a least primary current level, until which you will need to ensure accurate results. This current level would be IMIN. However, make sure when you select IMIN, that the secondary current corresponding to IMIN, going into the chip, is within the dynamic range of the IC's specification table. This will ensure that you will get accurate results as quoted in the datasheet's spec table.
Kindly let me know if you have further questions.
now, I have started the calibration of the meter ADE7753 with a reference meter. To set the CFDEN I measured the frequency of out in the reference meter with a load of 480 W (CFref=0.4167 Hz) and set the CFDEN of the ADE7753 in random values until I achieved set by the CF pin of the ADE7753 the same frequency (CFade=0.4167 Hz) with CFDEN=50. according to the data the value of WGAIN register is 0 (WGAIN=0).
I have probated with different load values (since 60 W up 480 W) and I have got the same values of frequency. Only, with a load of 40 W got a %ERRORcf=3.11%.
my question is if my procedure is valid and correct. besides if I can set the value got of CF with the load of 40 W as Wimin (WIMIN=40 W and IMIN=0.333 A) for the Calibrating Watt Offset because I tried of measured the frequency by the CF pin with a load value lower but I can't measured.
I am using a shunt for measured the current.
I have probated with different load values (since 60 W up 1260 W) and I have got the same values of frequency. Only, with a load of 40 W got a %ERRORcf=3.11%.
I calculated the APOS register with a load of 40 W as Wimin and the meter ADE7753 started to decrease the AENERGY register when there was load and the results weren't corrects.
The standard procedure to calibrate the CF output using a reference meter, is to calculate the CFDEN at nominal voltage and base current and then based on the error in the CF output( in comparison with the reference meter), set the WGAIN. This procedure can be found in page 39 of the datasheet.
I am not able to understand your other question about offset calibration. Can you explain your question in other words?
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