4
SCA
Front and Rear panel connectors provide NIM-
standard slow-positive logic level signals.
Amplitude
Nominally +5V. Complement signal
selectable by PWB jumper.
Time and Width
From start of TAC linear output to
either end of reset or end of linear output; PWB
selectable. Factory-set at end of reset.
Impedance
Z,
10
Rise Time
50 ns.
Fall Time
50 ns.
2.6. ELECTRICAL AND MECHANICAL
POWER REQUIRED
+24V, 95 mA; -24V, 165 mA;
+12V, 210 mA; -12V, 330 mA.
WEIGHT
Net
1.4 kg (3 lb)
Shipping
2.7 kg (6 lb).
DIMENSIONS
NIM-standard double-wide module
6.90 x 22.13 cm (2.70 x 8.714 in.) per TID-20893
(Rev).
3. INSTALLATION
3.1. GENERAL
The 567, used in conjunction with a standard NIM
bin and power supply such as the ORTEC
4001A/4002A, is intended for rack mounting.
Therefore, vacuum tube or other high-temperature
equipment operating in the same rack with the 567
must be sufficiently cooled by circulating air to
prevent exceeding the 50
(
C (120
(
F) maximum
operating temperature of the 567. The ORTEC
Model M127/N NIMFAN is available for rack
®
mounting above a NIM bin to provide forced-air
cooling.
3.2. CONNECTION TO POWER
The 567 is designed per TID-20893 and accepts its
operating power requirements through a mating
power connector when it is installed in a standard
NIM bin and power supply. As a safety precaution,
always turn off the power for the bin before inserting
or removing any modules. Monitor the dc voltages
at the test points on the control panel of the bin
after all modules have been installed and the power
is turned on in order to determine that none of the
dc voltages have been reduced by an overload.
3.3. CONNECTION INTO A SYSTEM
The 567 can accept both start and stop pulses from
NIM modules that furnish NIM-standard positive
and fast-negative logic signals or from the timing
output of a photomultiplier tube base. The input
impedance of 567 inputs depends on the selected
polarity. Inputs set for negative signals will have a
built-in 50
terminating impedance, whereas inputs
set for positive signals will have a nominal 1 k
terminating impedance. Inputs that are factory-set
for negative signals include Start and Stop, and
50
coaxial cable is recommended for proper
connection to these inputs. Inputs that are factory-
set for positive signals include Strobe, Reset/Inhib,
Start Gate, and Stop Gate, and these need to be
externally terminated with the same characteristic
impedance of the cable used only if reflections are
present. For instructions on changing inputs to
accept a different polarity, refer to Section 3.5.
No input or output connectors need be terminated
when they are not in use.
In any experiment in which it is reasonable to
assume that the count rates for start and stop will
be equal or nearly equal, use the signal furnished
from the origin of events into the start input and the
signal furnished from the response into the stop
input. The 567 will then measure the time
difference (T) from origin to response and furnish
an output amplitude that is some fraction of the
selected full-scale amplitude, proportional to the
ratio of T, to the selected full-scale time range.
In any experiment in which the two count rates
differ noticeably, such as one in which fewer
responses than event origins can be expected, use
the lower count rate as the start input to the 567.
This assures that the 567 dead time will be
minimized because it analyzes the time difference
only after a start signal is accepted. When the
response is used as a start signal, furnish the
signals from the origin of events through a delay
line into the stop input, and adjust the delay to
match the selected full-scale time of the 567. At
each start input signal the 567 will analyze the time
until its related origin signal is furnished to the stop
input. The time measured is then delay time minus
T, and produces a so-called inverted time
spectrum. The purpose of this type of system
connection is to reduce the number of conversions
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