Dr Bruce Griffiths wrote: > Didier Juges wrote: > >> I do not understand the signal on the rear trigger outputs. At the >> moment, I have a single 10 MHz sine signal fed to the START channel, and >> the 5370 is set to TI, MEAN, SAMPLE SIZE 1, + TI ONLY, START channel >> triggers on rise and STOP channel triggers on fall, and START COM is >> selected. The instrument displays about 60 nS (fairly stable, 150 ps >> jitter) or so at the moment. The rear START trigger shows a negative >> going pulse (400uS wide, at 62 mS rep rate), with the rising edge >> (positive going) synchronous with the 10 MHz signal and the phase is >> adjustable using the *STOP* trigger level! When I trigger the scope on >> the falling edge of the START trigger output, the 10 MHz signal seems to >> drift, and the trigger setting has no effect, except that if adjusted >> too far, the instrument stops updating the display. >> >> Apparently, the START trigger adjustment has no effect on the timing of >> the rear START trigger output, but will cause the display to freeze if >> the START trigger is set to either extreme, even though the START >> trigger output on the rear does not change. >> >> The STOP trigger output works the opposite: it responds to the START >> trigger level. Could it be that the outputs are reversed on my instrument? >> >> I am not sure this is a complete description, and maybe there is an >> obvious answer that I am missing, but I am perplexed. >> >> >> > Didier > > The 5370A processor can swap the front panel START and STOP inputs over > via an ECL multiplexer on bord A22. > The rear panel outputs reflect the actual selected START and STOP events > not necessarily the signals connected to the front panel START and STOP > connectors. > > Bruce > Good catch, but I thought that only came to play when +/-TI was selected, and I have selected +TI ONLY?
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