Racal Instruments 2251A Operator's Manual page 87

Pulse Width
The default settings when the Positive Width (PW) command is sent to the 2251A, in
addition to the above common settings, are:
COMMAND
TI
APS
BNS
ADC
The following commands, when sent to the 2251A while Positive Width (PW) is enabled will
cause the following changes in setup:
COMMAND
ANS
BPS
The default settings for a Negative Pulse Width (NW) command, in addition to the above
common settings, are:
COMMAND
TI
ANS
BPS
ADC
The following commands, when sent to the 2251A while it is in the Negative Width (NW)
mode will cause:
COMMAND
APS
5-4
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Parameter Set
Time Interval
Positive Slope, Channel A
Negative Slope, Channel B
DC Coupled, Channel A
Parameter Set
The 2251A will change to Negative Width (NW) mode returning a
header of NW. Channel A will have negative slope enabled and
Channel B will have positive slope enabled.
The 2251A will change to Negative Width (NW) mode returning a
header of NW. Channel A will have negative slope enabled and
Channel B will have positive slope enabled.
Parameter Set
Time Interval
Negative Slope, Channel A
Positive Slope, Channel B
Channel A, DC Coupled
Parameter Set
The 2251A will change to Positive Width (PW) mode and return a
header of PW. Channel A will have positive slope enabled and
Channel B will have negative slope enabled.