Hello Dave and all,
thank you for your great work.
It would be an great addition for my tube-/valve-curve-tracer and messurement-system.
But 2U hight by 9,5" would be a waste of space in my 19"-Racks. ;->
The 2 spares are for propper ventilation, but maybe i can get ridd of the HP 66332A.
A two-channel unit would be okay with extended range (+-350V max. 30mA).
Do you have plans in that direction??
Here some thoughts on the output-connector:
Triax is too hard to come by and too expensive.
BNC (maybe the HV-version) can't run the guard-signal propperly.
Mixed-D-Sub (5W5 or 9W4) with HF-contacts and RG188 PTFE-cable will be my choise.
Inner conductor signal, outer conductor guard and the shell for shield.
Would have to assemble a "snake" out of 4* RG188, control-wires, shield-braid
and outer isolation.
Control-wires can be safety-switch, hardware-/manual lockout etc...
Maybe one could recycle some old high-quality VGA-monitor-cable
(at least 3 koaxes for RGB inside).
It's a compromise i know, but it's just one connector/cable to run to the DUT-fixture.
ADC-sampling: I see in "SPI.INO" that there is some hand-tuning the timing.
Didn't get the reason why, isn't the output-data-rate responsible for the stop-band frequencies?
Line-frequency should be selectable or even programmed via SCPI ("CAL:LFR 50" on my continent)
and the ADC-timing set acordingly for best noise-rejection.
Just some thoughts Dave, kudos for your work.