TTL Option - Provides positive logic +5 V nominal pulse level; pulse width <0.1
µ
s; rise and fall times <25 ns; rear panel EPL00-250NTN LEMO connector.
50
Ω
TTL Option - Provides positive logic +5 V nominal pulse amplitude; Z
out
=
50
Ω
; pulse width <0.1
µ
s; rise and fall times <25 ns; rear panel EPL00-250NTN
LEMO connector.
Indicators
ICB READY - Green LED; on steadily indicates that the TCA parameters are loaded
and active; blinking indicates that the selected SCA is active.
ICR RATE - Multi-colored LED; Red indicates that PUR is on; Green indicates that
the PUR is off; the LED’s intensity is count rate dependent.
Pileup Rejector
PULSE PAIR RESOLUTION - 250 ns.
MINIMUM DETECTABLE SIGNAL - Limited by detector/preamp noise characteris-
tics.
PUR Threshold - Auto or Manual Adjust mode; computer selectable.
PUR Enable - On or Off; computer selectable.
Internal Jumpers
RESTORER MODE - Two-position internal jumper selects SYMmetrical or ASYM-
metrical baseline restorer modes; factory set to SYMmetrical.
POLARITY - Two 2-position internal jumpers must be set identically to select INPUT
polarity; factory set to negative.
INHIBIT POLARITY - Two-position internal jumper selects INHIBIT input polarity,
positive or negative true; factory set to positive.
AMP OUT IMPEDANCE - Two-position internal jumper selects Z
out
<1
Ω
or 93
Ω
;
factory set to <1
Ω
.
33
Indicators
