If someone with a 577 curve tracer try this test, install a transitor and with the step generator set to single and increase the collector voltage does the display indicate some current. Does moving the step generator amplitude proportionally effect the amount of current displayed?
I am thinking if someone could duplicate this with a good known 577 we will see if this is by design or if it is a fault.
DW,
I tried this with my 577 and with a PNP transistor in the standard test fixture. I have inverted the display so that the traces appear first at the bottom left of the CRT. With the # steps Control set to 1 step, I increase the collector voltage and I see the first line of the trace advance across the bottom at Zero (bottom graticule line), a single step appears above the ZERO Line, at whatever the step current control is set to. So I do not have any current offset indicating on the ZERO line. The ZERO Line remains at ZERO, indicating voltage being present with no current flow. Is that what you are looking for?
