EG&G ORTEC 552 Manual de operação e serviço - Página 8
Procurar online ou descarregar pdf Manual de operação e serviço para Instrumentos de medição EG&G ORTEC 552. EG&G ORTEC 552 16 páginas. Pulse-shape analyzer and timing single-channel analyzer
Imprimir páginavoltage signal applied to the rear panel LL Ref Ext con
nector for the lower-level discriminator reference thresh
old.
STROBE MODE Rear panel 2-position locking toggle
switch selects either an internal strobe, derived from the
input signal, or an external strobe, furnished through the
adjacent connector, to generate a channel B output. The
automatic reset time is »10 /jls.
B-FRACTION
Front panel switch selects the constant
fraction that will be used for the channel B response
point: marked .1 through .9 and Bl for 10% through 90%
and bipolar crossover (100%), referring to the decay after
the peak of the input waveform.
A-FRACTION
An internal jumper selects the constant
fraction that will be used for the channel A response
point; jumper positions are 10%, 20%, and 50%, referring
to the decay from the peak of the input waveform.
2.3.
INPUTS
INPUT Front panel dc-coupied BNC connector accepts
positive unipolar or bipolar signals, 0 to +10 V linear
range, ±12 V maximum; width, ^100 ns; lOOOfl input im
pedance.
LL REF IN
Rear panel BNC accepts lower-level bias
when the LL Ref mode switch selects Ext. An input of 0 to
-10 V on this connector corresponds to a range of 0 to
+10 V for the front panel Lower-Level control. Input pro
tected to ±24 V.
EXT STROBE IN
Rear panel BNC accepts a NIM-stand-
ard slow positive pulse, nominally +5 V, 500 ns wide, to
cause an output to occur from the channel B circuits
when the Strobe switch is set at Ext. The external strobe
must be provided within 10 /is after the linear input. At
the end of this period, the 552 resets its internal logic
without producing a channel B output.
2.4.
OUTPUTS
SCA NEG OUT A Front panel BNC connector provides
NIM-standard fast negative output pulses from channel
A only; nominally -16 mA (-800 mV on 50n load), ^20
ns wide, ^5 ns rise time. Output occurs promptly at the
channel A constant fraction trigger point.
SCA NEG OUT B Front panel BNC connector provides
NIM-standard fast negative output pulses from channel
B only; nominally -16 mA (-800 mV on 50n load), ^20
ns wide, ^5 ns rise time. Output occurs promptly at
strobe time.
SCA POS OUT B Front and rear panel BNC connectors
provide NIM-standard slow positive output pulses from
channel B only; nominally +5 V, 500 ns wide, ^20 ns rise
time. Output occurs promptly at strobe time. Zo ^lOn.
LL OUT Rear panel BNC connector provides positive
NIM-standard output, nominally +5 V, 500 ns wide. Out
put occurs as leading edge of the linear input crosses
the LL threshold, Zo ^lOfl.
UL OUT Rear panel BNC connector provides positive
NIM-standard output, nominally +5 V, 500 ns wide. Out
put occurs as leading edge of the linear input crosses the
UL threshold. Zo <10n.
2.5.
RELATED EQUIPMENT
The 552 is compatible with all ORTEC amplifiers and
other amplifiers having a 0- to +10-V linear output range.
2.6.
ELECTRICAL AND MECHANICAL
POWER REQUIRED +24 V, 83 mA; -24 V, 83 mA; +12
V, 166 mA; -12 V, 166 mA.
DIMENSIONS NIM-standard single-width module (1.35
by 8.714 inches) per TID-20893 (Rev).
3.
INSTALLATION
3.1.
GENERAL
The 552 must be used in conjunction with an ORTEC 401/
402 Series Bin and Power Supply, or equivalent, which is
intended for rack mounting. If any source of heat is oper
ating in the same rack, there must be sufficient cooling air
circulating to prevent any localized heating of the transis
torized and integrated circuits used throughout the 552.
The temperature of equipment mounted in racks can
easily exceed the maximum unless precautions are taken;
the 552 should not be subjected to temperatures in excess
of 120°F (50° C).
3.2.
CONNECTION TO POWER
Turn off the Bin Power Supply when inserting or removing
modules. The ORTEC NIM modules are designed so that
it is not possible to overload a properly operating power
supply with a full complement of modules in the bin.
Since, however, this may not be true when the bin con
tains modules other than those of ORTEC design, power
supply voltages should be checked after the modules
have been inserted. The 401/402 has test points on the
power supply control panel to monitor the do voltage
levels.
When using the 552 outside the 401/402 Bin and Power
Supply, be sure that the power extension cord or cable
that is used properly accounts for the power supply
grounding circuits that are provided according to the
recommended AEC standards outlined in TID-20893
(Rev). Both high-quality and power-return ground con
nections are provided to ensure proper reference voltage
feedback into the power supply, and these must be pre
served in remote cable installations. Be careful also to
avoid ground loops when the module is operated outside
the bin.
3.3. CONNECTION FROM LINEAR AMPLIFIER
The Input BNC connector on the front panel accepts posi
tive unipolar or bipolar signals through a dc-coupied
input path. For bipolar input pulses, the positive lobe will
be analyzed. The amplifier output should be adjusted so
that there is no dc offset, and the poie-zero networks are
adjusted properly.