Hi Greg,
Greg Burnett wrote:
Hi Ed,
IIRC it's normal for the circuit check meter readings to behave "squirrelly"
as you've described for the 3 output checks. I think this function is pretty
much only to "crudely" show that you have (or don't have) each output.
It's not exactly 'time nuts' quality is it? :-)
As for your 100kHz & 1MHz dropping-out when you load your 5MHz output into
25 ohms, this might be a sign of a marginal condition of your output
section - e.g., 5MHz signal dropping too low when loaded with 25 ohms?
That's what I'm assuming. According to the schematic for the older
version, the path feeding the divider is well isolated from the path to
the output for both the 5 MHz and 1 MHz stages. I expected HP to do at
least that well when they modified the design to include the 10811.
That's what makes me wonder if there's a circuit fault.
However in practical use I think various destination instrument's timebase
inputs might require a bit more voltage than you'd have at best into 25 ohms
anyway. So I'd probably not load the 105B into such a low impedance.
Agreed. At this point, I'm just trying to figure out what I can and
cannot do.
Ed
Best,
Greg
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