Specifications

4-11
Operating Features and Specifications
Auxiliary Input
Alternate Pattern Selected
The instrument will output one of two patterns (A or B) at the end of either pattern. The
auxiliary input controls which pattern is output in one of two modes:
• Oneshot - a rising edge on the auxiliary input inserts a single version of B pattern into
repetitions of pattern A.
• Alternate - The logic state of the signal at the auxiliary input determines which pattern
is output. A logic ‘0’ will output pattern A.
NOTE In both cases, switching between patterns is at the end of a pattern and
is hitless (error free).
Data Output Inhibit (Gating mode)
If an Alternate Pattern is not selected, an active (TTL low) signal at the auxiliary input
port forces (gates) the data to a logic zero at the next 32-bit boundary in the pattern. See
the following figure:
NOTE Connecting an external termination to the auxiliary input will pull it
low and disable the data output.
Interface
Interface: dc coupled
Levels: TTL levels (active low)
Connector: BNC female connector
To Select Oneshot Mode
Select then set to and to
.
To Select Alternating Mode
Select then set to and to
.
pattern
ALTPAT AUX USR AUX ALTPAT ALTONCE
ONCE
pattern
ALTPAT AUX USR AUX ALTPAT ALTONCE
ALT