Zeppelin
Member level 1
The Schematic shows part of a circuit that I am working on. I need to vary the current through the diodes using the series resistor R and take measurements. I have tried this in two ways:
a- using a scope current probe and
b- using two scope voltage probes to measure the voltage drop across the resistor and divide by resistance
The problem is the measurements from these methods do not match:
a- The current probe measures 350mA on the pulse see Capture-1 attached
b- Ch1 measures 2.23v and Ch2 10mv(see Captures 2,3 attached), with R = 2.5 ohm, the current should be I = 2.2/2.5 = 880 mA on the pulse
Why are these two results different?Am I doing something wrong here?
Thank You