Specifications

Guide to Operation - Menus
28
the fixed threshold when A DISC is FIXED and
the starting level when A DISC is SCANned.
When the A DISC mode is SCAN and a scan is in
progress, this line displays the current position of
the A DISC level. The cursor is inactive and
replaced by a ':'. The spin knob cannot adjust the
threshold while it is scanning. When the mode is
SCAN, the starting level may only be adjusted
when the counters are in reset.
B DISC SLOPE= RISE
FALL
B discriminator may be triggered by rising or
falling edges of the INPUT 1 or INPUT 2 signal.
If the signal pulses are negative going, then the
slope should be FALL. If the signal pulses are
positive, then the slope should be RISE. In either
case, the B DISC output is always active low; i.e.,
a discriminated rising edge of the signal will be
output as a negative going NIM pulse at the B
DISC output. The falling edges of the B DISC
output are counted by counter B.
B DISC= FIXED
SCAN ∆= -1.0 mV
The threshold level of B discriminator may be
FIXED or SCANned. If the level is FIXED, the
right hand parameter is not displayed. If the level
is scanned, then the right hand parameter is the
step size. At the end of each count period in a
scan, the level is incremented by one step size.
The step size can be varied from -20.0 mV to +
20.0 mV. The range of a scan is N PERIODS
times the step size. The starting level is set in the
next menu line.
The scan mode may be changed during a scan. If it
is changed to SCAN, the level begins scanning
from the start value on the next count period. If it
is changed to FIXED, the level returns to the start
level immediately.
The step size may also be changed during a scan.
The new step size will be in effect at the end of the
next count period. The scan is not reset or paused.
B DISC LVL = -10.0 mV
: -11.0 mV
The threshold level of B discriminator may be
adjusted from -300 mV to + 300 mV. This level is
the fixed threshold when B DISC is FIXED and
the starting level when B DISC is SCANned.
When the B DISC mode is SCAN and a scan is in
progress, this line displays the current position of
the B DISC level. The cursor is inactive and
replaced by a ':'. The spin knob cannot adjust the
threshold while it is scanning. When the mode is
SCAN, the starting level may only be adjusted
when the counters are in reset.
T DISC SLOPE= RISE
FALL
When T counter's input is INPUT 2, T
discriminator may be triggered by rising or falling
edges of the INPUT 2 signal. If the signal pulses
are negative going, then the slope should be
FALL. If the signal pulses are positive, then the
slope should be RISE. In either case, the T DISC
output is always active low; i.e., a discriminated
rising edge of the signal will be output as a
negative going NIM pulse at the T DISC output.
The falling edges of the T DISC output are
counted by counter T.
T DISC= FIXED
SCAN ∆= -1.0 mV
The threshold level of T discriminator may be
FIXED or SCANned. If the level is FIXED the
right hand parameter is not displayed. If the level
is scanned, then the right hand parameter is the
step size. At the end of each count period in a
scan, the level is incremented by one step size.
The step size can be varied from -20.0 mV to +
20.0 mV. The range of a scan is N PERIODS
times the step size. The starting level is set in the
next menu line.
The scan mode may be changed during a scan. If it
is changed to SCAN, the level begins scanning
from the start value on the next count period. If it
is changed to FIXED, the level returns to the start
level immediately.