No, you aren't missing anything. What Jeff was saying
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is if BA is truly at ground, then you cannot have a signal
out your calibrator. It may appear to be grounded if you
use an ohmmeter that is on too high a scale... due to the
160, or so ohms that the circuit inherently has to ground.
Mike Merigliano wrote:
The signal is not shorted to ground -- it goes through a 2.19K resistor in series
first, so there is no short. My Tek 453 has a calibrator signal, at specification. My
ohmeter and voltmeter check measurements between/around Q1274, point BA, R1274, and
point BB match what is on the schematic.
Maybe I am missing something.
On 5/9/2018 10:19 AM, Jeff Urban wrote:
On Wed, May 9, 2018 at 08:13 am, Mike Merigliano wrote:
There is no error here; BB is a ground point, and the emitter of Q1274 goes toThen there can be no output at the calibrator terminal unless the whole thing
it via R1274 in series.
floats and has a separately isolated power supply. The signal would forever be
shorted to ground.