I am not conviced that my nice camel is not ok. My other
S-52 shows about the same camel, be it with nearly no dip
between the humps. What I measure is the TD output, not
the snap-off diode (CR66) voltage. It looks like there is
a slow oscillation superimposed which causes the humps. I
think LR64 might be responsible for this. In the 7S12 the
DC bias current for CR66 is supplied via L64 of LR64. When
the 7S12 interrupts that current L64 might cause (heavily
Meanwhile I followed David's S-53 suggestion. S-53 free
running, S-53 Trigger output via delay line and attenuator
fed into the S-6. The trigger pulse now drifted to the
left, about 500 ps. Similarly I put the S-6 in a 7S11 in
the left slot along with the 7S12. Again drift to the left
but only 300 ps (here I am not sure the units were
completely cooled down initially). I ignore that the 7S11
might introduce drift also; I set the delay dial at
Inside the 7S12 it means that the delay from S-53 trigger
to S-6 strobe pulse increases with temperature. The path
to the internal sampling head contains an extra delay
which is set by R380. This extra delay has its own drift
of 200 ps it seems.
the 7S12 determined delay from S-52 (pre)trigger to S-52
TD triggering were constant, then the above findings would
imply a drift to the left of the TD pulse. A 600 ps drift
to the right can only be explained by an even larger
positive drift of 1.1 ns in delay from S-52 (pre)trigger
to S-52 TD triggering. I can imagine that this delay,
mainly set by R594, is temperature dependent.
am I thinking the wrong way around with events coming
later and earlier?
--- In TekScopes@...
Maybe not only a psych experiment. Now I have a
migraine from reading that. But anyway your trigger does
look kind of sick. That double hump cannot be the right
kind of camel.