Re: Continued: 2465B CTT/HPIB/WR TEST 05 fail 42, all CTT fail
Chuck Harris <cfharris@...>
Hi Jon,toggle quoted messageShow quoted text
I guess, but how would you get the zero crossing/trigger
points into the CTT?
Tek used a combination of features in the trigger hybrid,
and a PAL that they grafted onto the trigger hybrid to
massage the signal from the vertical trigger tapoff so that
the CTT could time it... all a reasonable thing to do.
I have some suspicion that the unfortunate problem with
the trigger hybrid when doing CTT functions is the interface
between the PAL and the trigger hybrid. Perhaps the PAL's
inputs are too heavy of a load for some trigger hybrid's
Or maybe there is a timing issue between the PAL and the
It could even be something as stupid as a failed internal
pull up resistor on one of the hybrid's input/output pins.
Some simple probing around on the PAL may be in order.
I have never found the PAL, or the PAL's socket to be the
problem, but I have found trigger hybrid swaps will make