I use an ADC42 on an old Win98m computer to monitor a very slow DC pulse, aprox .5 to 1hz.
This is the voltage of a charging and discharging capacitor under test. I watch the cap charge and discharge several times through a load, then switch the device off and watch the cap discharge through the bleed resistors.
Peak voltage is about 1060 volts DC. (I am using a voltage divider network to allow this high voltage use)
Chart recorder mode works best for my use.
I use the O and X cursers to form a "window" of acceptability, as long as the peak stays within the window everything is good.
I would like to also display the actual DC voltage, but running a meter display along with the scope display either seperatly or in composit mode slows everything down to the point of being useless. I have therefore tried using the "Measurements" feature on the scope screen, but with unsatisfactory results.
When using the "DC Voltage" and "Whole Trace" settings the voltage reading does not follow the scope graph at all.
While the graph shows the peak at 1060 volts, the DC voltage will only read around 600 volts or so. Then when power is shut off the voltage reading stays at several hundred volts while the graph shows the cap slowly discharging down to around a hundred volts or so. Then the DC voltage reading suddenly "wakes up" and starts to slowly fall and will eventually get down near zero, but long after the scope graph. Using the "Peak to Peak" setting shows the peak voltage better, but then acts even worse when the power to the device is turned off and the bleed resistor discharge cycle is being viewed. I have tried many different settings, but nothing seems to help.
Can you make some suggestions?
My software version is 5.13.4 - 32bit