A. Specifications
Inputs
INPUT - Accepts positive or negative tail pulses from an associated preamplifier; am
-
plitude 10 V divided by the selected gain, 25 V maximum; rise time: less than shaping
time constant; decay time constant: 40 µs to ∞; polarity set with internal jumpers; Z
in
2
kΩ > Z
in
> 0.5 kΩ, depending on input POLARITY and COARSE GAIN; front and
rear panel BNC connectors.
INHIBIT - Accepts a standard TTL logic signal from associated reset preamplifier;
used to inhibit the SCAs and reset the pileup rejector during the preamplifiers reset cy
-
cle; positive true or negative true signal polarities, internal jumper plug selectable;
loading: 4 kΩ resistor connected to +5 V for positive true or ground for negative true;
rear panel BNC.
Outputs
AMP OUT - Provides positive, linear, actively filtered shaped pulses; amplitude linear
to +10 V, 12 V max.; dc restored; dc level factory calibrated to 0.5 mV; Z
out
= <1 Ω or
93 Ω, internally selectable; short circuit protected; front panel BNC.
SELECTED AMP - Provides positive computer selected, linear, actively filtered
shaped pulses; amplitude linear to +10 V, 12 V max.; dc restored; output dc level fac-
tory calibrated to 0.5 mV; Z
out
= 93 Ω; short circuit protected; front panel BNC. Com
-
puter determines if SELECTED AMP OUTPUT is active.
SELECTED SCA - Provides a standard positive TTL logic output signal coincident
with computer’s selection of SCA one, two, or three; pulse width 0.1 µs, nominal; rise
time and fall time <25 ns; Z
out
= 51 Ω; 6mA drive capability for TTL high or low
level; front panel BNC.
ICR - provides a standard positive TTL logic signal corresponding to input count rate;
disabled by INHIBIT; positive true; width nominally 150 ns, TTL with 1 kΩ pull up
resistor through 47 Ω output resistor; rear panel BNC.
SCA 1, 2, or 3
Fast NIM Option - Provides negative current output -16 mA into 50 Ω; rise time
< 5 ns; pulse width <0.1 s; rear panel EPL00-250NTN LEMO connector.
32
Specifications
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