EG&G ORTEC 476 Kullanım Kılavuzu - Sayfa 7

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2.2. CONTROLS
CHANNEL SELECT Front panel rotary switch selects
any single channel continuously for calibration or testing
purposes. 16-position switch in the 476-16; 8 positions in
the 476-8; 4 positions in the 476-4.
SINGLE CHANNEL/NORMAL MULTIPLEX Front panel
toggle switch allows either the Channel Select switch or
internal logic to control the linear gate channel selections.
THRESHOLD Front panel discriminator threshold con
trol common to all channels; 10-turn Helipot; range 0 to
100 mV.
FINE GAIN Front panel 20-turn control for each chan
nel, used to trim the unity gain adjustment; range
~±0.34%.
TIME CONSTANT A 4-section miniature slide switch,
mounted on the printed circuit, permits selection of 1, 2,
3, or 6 ius to match the related amplifier shaping time con
stant; one switch assembly for each channel.
2.3. INTERNAL JUMPERS
7010/6240B Jumper selects either polarity of strobe
signal from related analyzer.
476 SELECT Jumper selects which of four possible 476
modules is active; must match the ADC to which the 476
is connected.
ROUTING BITS Jumpers select the high order bits for
routing according to memory capacity and number of
subgroups; select 4 adjacent bits for 16 subgroups, 3 bits
for 8 subgroups, or 2 bits for 4 subgroups; available bit
identities are from FED8 through FED15.
MODE SELECTIONS Jumper selects which of three
modes is identified to the analyzer from the 476; BM1
identifies a PHA type request normally not used.
2.4.
INPUTS
LINEAR INPUTS One BNC connector per channel on
the front panel accepts 0- to 10-V positive pulses from an
amplifier, shaped with 1-, 2-, 3-, or 6-ais time constant or
stretched >2 ^lS. Z,„ ~100n, dc-coupled.
ADC BUSY Rear panel BNC connector accepts an ADC
Busy signal from the analyzer to hold a routing signal
until storage is complete.
CONTROL Rear panel 20-pin connector carries ex
ternal control signals for logic gates; signals are listed
in Table 2.1. A low logic level on the corresponding FEC
line +1 disables that input. (FEC0 inhibits channel 1, etc.)
2.5.
OUTPUTS
LINEAR OUT Rear panel BNC provides the analog out
put to be used as an ADC input in the related analyzer.
GATE OUT Rear panel BNC provides a logic pulse to
be used as a gate input to the ADC. Nominally +4 V from
discriminator crossing of a valid pulse until ADC Busy
returns to false.
Table 2.1.
Front End Control Bus.
Pin
Signal
Pin
Signal
1
Gnd
11
Gnd
2
FEC0
12
FEC8
3
FEC1
13
FEC9
4
FEC2
14
FEC10
5
FEC3
15
FEC 11
6
FEC4
16
FEC12
7
FEC5
17
FEC13
8
FEC6
18
FEC14
9
FEC7
19
FEC15
10
Gnd
20
Gnd
2.6. DATA BUS CONNECTOR
DATA BUS Rear panel 50-pin connector provides both
data and handshake signals between the 476 and the re
lated analyzer; pin assignments are listed in Table 2.2.
2.7. ELECTRICAL AND MECHANICAL
POWER REQUIREMENTS +12 V, 220 mA; -12 V, 45 mA;
+24 V, 160 mA; -24 V, 40 mA.
DIMENSIONS NIM-standard
double-width
module
(2.70 by 8.714 in.front panel) per TID-20893 (Rev).
Table 2.2.
Front End Data Bus.
Pin
Signal
Pin
Signal
1
FED0
26
BM01
2
FED1
27
BM02
3
FED2
28
GND
4
FED3
29
FERDY
5
FED4
30
GND
6
FED5
31
COMP
7
FED6
32
GND
8
FED7
33
STROBE
9
FED8
34
GND
10
FED9
35
ENAB
11
FED10
36
GND
12
FED11
37
SEL0
13
FED12
38
GND
14
FED13
39
SEL1
15
FED14
40
GND
16
FED15
41
SEL2
17
FED16
42
GND
18
FED17
43
SEL3
19
FED18
44
GND
20
FED19
45
ADC READY
21
FED20
46
GND
22
FED21
47
TX COMP
23
FED22
48
GND
24
FED23
49
ADCSTROBE
25
BMO0
50
GND