Hi Siggi,
This time I didn't study the manual but just looked dual-trace at the waveforms of trigger and Hi Ampl. Trigger always properly terminated. But I confused the traces when saying that the down-going edge of the trigger was slow; that was the terminated Hi Ampl. I checked again. It's nice to see how the terminated Hi Ampl negative going edge "climbs" along the same path to its maximum, when you vary the amplitude knob.
When Hi Amp is unterminated and loaded with coax cable then the rise and fall are almost symmetrically, both governed by the same RC time as mentioned already. I found about 200 ns rise time when using about 1 m coax which measured 128 pF including the scope input. This seems not far off at 600 Ohm.
Albert
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On Thu, Jul 5, 2018 at 02:26 pm, Siggi wrote:
On Thu, 5 Jul 2018 at 15:04 Albert Otten <aodiversen@...> wrote:
The trigger output and the Hi Ampl output are in phase square waves. The
fast up-going edge of the trigger corresponds to the fast up-going edge of
the Hi Ampl when it switches from negative to zero.
Right - same polarity on the edges, thanks. The manual spells this out, I
guess I could have read it rather than speculate. But where's the fun in
that?
The slower down-going edge of the trigger corresponds to the down-going
edge of the Hi Ampl.
Mmmm, slower meaning non-reference. It's not clear to me why this edge
would be slower, but maybe that's just me. The output is driven towards the
negative, but the rising edge is entirely at the mercy of the 600 Ohm
output shunt and any capacitance downstream from there.
