Service manual

3
NOTES:
(1) The module is within the current allotment for a
single NlM width when using the -6V position with a
NIM Class V Power Supply or equivalent.
(2) The module exceeds the current allotment for a
single NlM width on the -12V supply when using the
-12 V position. However, this position permits using
the discriminator in bins with power supplies not
providing -6 V.
GATE INPUT JUMPER (G+, G-, or BG)
PWB
jumper selects one, of three Gate Input signal
paths.
G+
Selects the rear panel BNC Gate input
connector to accept slow positive NIM input signal
levels for gating; dc-coupled; Z > 1 k .
in
G-
Selects the rear panel BNC Gate input
connector to accept fast negative NIM input signal
levels for gating; dc-coupled; Z
=
50 .
in
BG
Selects the Bin Gate line (pin 36 of the NIM
power connector block) to accept slow positive NIM
input signal levels >+2 V for gating; dc-coupled; Z
in
> 1 k .
POSITIVE OUTPUT WIDTH (+ Width)
PWB 4-
turn potentiometer sets the width of the slow
positive NIM output signal in the range from 0.5,
µs to 2.5 µs.
POSITIVE OUTPUT SIGNAL POLARITY (PO or
PO )
PWB jumper selects the slow positive NIM
___
output signal (PO) or the complement output signal
(PO ).
___
2.3. INPUTS
INPUT
Front panel BNC connector accepts fast
negative input signals from 0 V to -5 V without
saturation; dc-coupled; Z = 50 ; reflections 5%
in
for t 2 ns.
r
GATE INPUT
Rear panel BNC connector; input
signals accepted according to PWB Gate Input
Jumper.
G+ Jumper Position
Accepts slow positive NIM
input signal levels for gating; dc-coupled;
Z > 1 k .
in
G- Jumper Position
Accepts fast negative NIM
input signal levels for gating; dc-coupled;
Z = 50 .
in
2.4. OUTPUTS
TIMING
Two front panel BNC connectors provide
simultaneous NIM-standard fast negative logic
signals; t 2 ns; t 3 ns; t 5 ns.
rf w
BK OUT
Front panel BNC connector provides a
NIM-standard fast negative logic pulse that occurs
simultaneously with the timing outputs; width
variable by front panel adjustment from 10 ns to
1000 ns; t 2 ns.
r
POSITIVE
Front panel BNC connector provides
NIM-standard slow positive logic pulse
simultaneously with timing outputs; Z < 10 ; width
o
variable by PWB width adjustment from 0.5µs to
2.5µs. The associated LED is triggered for
approximately 3 ms (updating) by each positive
output pulse.
2.5. ELECTRICAL AND MECHANICAL
WEIGHT
Net
1.2 kg (2 lb 11 oz).
Shipping
2.25 kg (5 lb).
DIMENSIONS
Standard single-width NIM module
(1.35 by 8.714 in.) per TID. 20893 (Rev).
POWER REQUIRED
Logic Current Switch*
Position
-6 v -12 V
_________(mA) (mA)
+12 V 100 100
-12 V 100 500
+6 V 0 0
-6 V 400 0
+24 V 0 0
-24 V 80 80
117 V ac 0 0
*See
"NOTES"
on Logic Current Switch,
"Controls" Section of Specifications.