Positive/Negative Pulse; Rise/Fall Time - Racal Instruments 2251A Operator's Manual

The 2251A, for all of the automatic functions except Phase, defaults to the following
signal conditioning parameters:
COMMAND
BCC
AAU
ADC
AFD
When in the automatic functions of Pulse Width and Rise/Fall Time, the signal being
measured on the 2251A is on a single channel and the Common mode (BCC) is
automatically enabled. Channel A and B inputs are internally connected to allow the counter
to minimize propagation delay and mismatch. When in Common mode it is not possible to
swap Channels A and B. Therefore, Special Function 21 (SFE 21) is not applicable.
5-2
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Figure 5-1 Positive/Negative Pulse
Figure 5-2 Rise/Fall Time
Parameter Set
Common Channel B to Channel A
Auto-trigger Channel A (and Channel B due to Common)
DC couple Channel A (and Channel B due to Common)
Filter is disabled on Channel A, the only channel on which it is
available.