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Hi Klaus
I had some time to make changes, however it looks like the scale arithmetic doesn't work, see my attachment, see watch window variable calculations.
Hi
So im using R1=100K, R2=2k with a ADC GAIN= of 1, 130V= 129.23vdc = 2.53V fsd, 1mV=19.0607uV per step.
I made changes to my code it looks like this.
// Setup ADC SPI.
adc_cfg_channel( ADC_CH1 | ADC_CTRL_UNIPOLAR | ADC_GAIN1 );
/*
Note: ADC adc_read() function obtains...
I think I now understand your previous solution, I have made some DC sweep simulations and it came to me what I think you were suggesting.
The idea is to keep the first range on the 25V/1mV range scale, this is done by the micro basically if VIN < High_Range (where High_Range > 25V) the "auto...
Hi I have a few unused OP07 instrumentation op-amps laying around, they look good for (DC applications) with low offset figures.
(Input Offset 75uV)
(Input Offset Current 3.8uA)
(Closed-Loop Bandwidth 600Khz)
I might just use them depends how well they perform, you are definitely correct...
Hi im glad someone replied, I am glad my effort for clarity was noticed, I understand taking someone else`s time to help me requires effort, which I appreciate.
Anyway.
I will play with those values, I have attempted a simple test using r1=100K and R2=1K which equates to 9.9uV per 1mV step...
I'm designing a voltmeter and current measurement system that forms part of a electronic load. Lets tackle the volt meter first.
I'm using a 16-BIT ADC (AD7708) and want to measure the following voltages see below, the ADC is pretty neat for DC applications and is used in the BK8500...
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