Re: TG501 2ns & 1ns operation
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Nope, not intended nor expected. But I don't expect to see the MARKER OUT output to be putting out anything while in 1ns mode. The 1ns output on the 1ns ONLY BNC is otherwise fine - as good as my equipment can make out.
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The MARKER OUT should be pulled up by Q460, and I'm seeing a crappy 40mV ~2ns (500MHz) sine wave. I've taken a look at Q460. It's not socketed, so I'm not going to pull it at this point to check on a curve tracer. Not yet anyway. I would like to know what is expected. Am I right that it should be near +5v (minus a diode drop?)? On Thursday, December 2, 2021, 03:31:39 PM PST, Harvey White <madyn@...> wrote:
IIRC, the marker is labeled 2ns to (whatever), which makes me suspect that there was never intended to be a marker out at 1 ns.? Haven't looked at the output, though. Harvey On 12/2/2021 5:51 PM, Dave Peterson via groups.io wrote: I guess my next question would be: is that horrible 40mV p2p signal coming out of the MARKER OUT "normal" in 1ns mode? Yuck. |
Dave Peterson