"Pin 1 problem" on BNC-2090(A) ?

[Mike Saginaw]

I'm getting familiar with audio literature about the "pin 1 problem."  On visual inspection it looks like the BNC-2090 has this problem.

Can anyone confirm?
 Does anyone know the approximate magnitude of the resulting noise?
  How about the BNC-2090A?
   Does any company make hardware units that avoid the problem and are compatible with M-series data acq. cards?

[ In the pin 1 problem, the signal cable's shield is connected to traces that run on the printed circuit card, coupling shield noise into the analog circuit signal pathways.  To avoid the problem, recommended practice is to connect the signal cable's shield via low impedance connection to the chasis, without getting inside the BNC-2090(A) shield. ]

Thanks and Regards,
Mike Saginaw

[David S.]

Hi Mike -

The shield wire from the cable is indeed routed onto the internal board along with the signal, and it is connected directly to chassis ground through the board.  We don't have any specs on noise that might result from signal degradation between the signal pin and GND though, since the performance can vary widely.  However, I can confidently assert for you that the BNC-2090A was designed as a direct functional replacement for the BNC-2090 with a much higher-quality design across the board.  So any degradation issues you may see with your older connector block will not be present in the newer model.