ljcox said:
djpubba said:
The values I get on screen must be inverted.
I don't understand this point.
Well, my measurements indicate that the lower the voltage, the higher the screen value is. You seem to expect the opposite, so the screen values must be inverted from what you're expecting.
No, see the spreadsheet below.
Perhaps it is time for you to provide a summary of the voltages, currents and screen deflections to clear up the confusion. Be sure to include the resistance values of the resistors & pots so we are all on the same wavelength.
Sure. What configuration would you like me to take measurements from -- Ron's original configuration or Ron's + your suggested changes?
Ron's original but with R5 = 3.3k or lower. If not, 5 k will do.
As you can see, these are based on your measurements when R1 + R5 was set to about 32.5 k. The "I" value is calculated from the R5 and v figures. I deduced the R5 value from your current measurements.
I-----------------v------Def----------R5
106.5----------4.06----290---------32.5
61.8-----------2.609---500---------32.5
30.1-----------1.578---999---------32.5
uA-------------Volt------------------k Ohm