Acquisition Device Input
Lynx DSA User's Manual - 9240227J
131
A. Specifications
Acquisition Device Input
ENERGY IN
Detector/preamplifier signal input connector, BNC. Accepts positive or negative
signals from an associated detector preamplifier; amplitude for full scale conversion
±
1 V divided by selected gain; maximum input (dc) for linear operation is
dependent on the Input Attenuator setting; Attenuator OFF (x1):
±
4 V, Attenuator
ON (x 0.25):
±
12 V, dc coupled and protected to
±
12 V maximum; rise time: less
than the selected Rise Time + Flat Top settings; acceptable preamplifier decay time
constant: 40
µ
s to infinity; Z
in
is 1k.
TRP INH
Reset-Preamp inhibit input connector, BNC. TTL compatible logic signal. Software
selectable polarity, functionality depends on the mode selected.
•
NORM – Signal inhibits the signal processing and extends the dead time for
the duration of the inhibit signal.
•
RESET – Signal inhibits the signal processing and extends the dead time for
the duration of the inhibit signal OR the duration of an internal inhibit timer.
HV INH
Preamp high voltage inhibit input connector, BNC. Accepts input from the detector
preamplifier to shut down the HVPS in the event of a detector warmup above its safe
operating temperature; polarity is software selectable to match the preamplifier.
•
Positive polarity – For CANBERRA preamplifiers; Enable condition (cold
detector) is an open circuit or active high = +1.2 V to +24 V; Inhibit
condition (warm detector) is –24 V to <+1.2 V or ground.
•
Negative polarity – For preamplifiers and LN monitors where enable
condition (cold detector) is –24 V to <+1.2 V; Inhibit condition (warm
detector) is open circuit or active high = +1.2 V to +24 V. With Negative
polarity selected an open input will disable the high voltage.
Note: After inhibit is removed, the high voltage remains disabled until the
user acknowledges the fault condition via a reset of the high voltage
supply.
MCS
MCS input connector, BNC. TTL compatible. Minimum pulse width is 25 ns.
Software selection for MCS input must be set to TTL-input to accept pulses from
MCS connector.
