DISPLAY: The default setting for the display is “bright”, pressing the “DISPLAY” button once changes the display to it’s “dim” or “low intensity” setting, pressing the button a second time selects “off ” for the display. When “off ” is selected any other control function will cause the display to indicate product operational status for approximately 7 seconds and then the display will once again blank.
Pressing the “DISPLAY” button a third time cycles back to a “bright display”.
We recommend the use of the balanced output mode where possible. Balanced input to
With balanced operation, the common mode rejection of the preamp reflects the intrinsic common mode rejection of the topology, the matching of the gain devices, and the matching of the attenuator channels. In this case we have been able to keep the total mismatch to about .1%, for a common mode rejection of approximately
The input system of the preamplifier will exhibit full common mode noise rejection with passive balanced sources, where the negative input is connected to ground at the source through the appropriate source impedance. This allows adaptation of unbalanced sources to balanced operation with passive cable connections in a manner that achieves the superior noise rejection of active balanced sources.
The use of a
The digital circuits are powered by a power supply that is isolated from the analog supply. Should it ever be necessary to update the software that controls the functioning of the preamp only the socketed
Rugged mechanical muting relays, which delay connection during
The
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