EG&G ORTEC 426 Manual de operação e serviço - Página 7
Procurar online ou descarregar pdf Manual de operação e serviço para Unidade de controlo EG&G ORTEC 426. EG&G ORTEC 426 16 páginas. Linear gate
Imprimir páginaimpedance 65012, dc-coupled. Front panel BNC connector
for each.
DC Inhibit Rear panel BNC connector; inhibits input pulses
from passing through the output during intervals of pulses
or dc levels; impedance 65012, dc-coupled.
Weight (Shipping) 4.0 lb (1.82 kg).
Weight (Net) 2.1 lb (0.96 kg).
Dimensions Single-width module (1.35 by 8.714 in.) per
TID-20893 (Rev.).
2.4. OUTPUT
Rated output range 0.2 to 10 V positive; 12 V maximum.
Output impedance ~212, short-circuit protected. BNC con
nector.
2.5. ELECTRICAL AND MECHANICAL
Power Requirements
-1-24 V, 30 mA; -H2 V, 16 mA;
. -24 V, 49 mA; -12 V, 4.9 mA.
2.6. RELATED EQUIPMENT
The input to the linear gate of the 426 can be from any of
the linear circuitry in theORTEC NIM-standard modules. In
typical applications the output of the linear gate feeds a
multichannel analyzer directly. The output is also compatible
with any of the linear modular circuitry in the ORTEC NIM-
standard modules.
3. INSTALLATION
The ORTEC 426 contains no internal power, but is used in
conjunction with an ORTEC 401 /402 Series Bin and Power
Supply, which is intended for rack mounting. Therefore if
vacuum tube equipment is operated in the same rack with
the 426, there must be sufficient cooling air circulating to
prevent any localized heating of the all-transistor circuitry
used throughout the 426. The temperature of equipment
mounted in racks can easily exceed 120°F (50°C) unless
precautions are taken. The 426 should not be subjected to
temperatures in excess of 120°F (50 C).
3.1. CONNECTION TO POWER
Turn off the Bin power supply when inserting or removing
modules. The ORTEC 400 Series is designed so that it is not
possible to overload the Bin power supply with a full
complement of modules in the Bin. Since, however, this may
not be the case when the Bin contains modules of other
than ORTEC design, the Power Supply voltages should be
checked after the modules are inserted. The 401/402 has test
points on the Power Supply control panel to monitor the dc
voltages.
When using the ORTEC 426 outside the Bin and Power
Supply, take care to ensure that the power jumper cable
used properly accounts for the Power Supply grounding
circuits provided in the recommended standards of AEC
TID-20893 (Rev.). Both clean and dirty ground connections
are provided to ensure proper reference voltage feedback
into the Power Supply, and these must be preserved in
remote cable installations. Be careful to avoid ground loops
when the module is operated outside the Bin.
3.2. INPUT SIGNAL CONNECTION TO LINEAR GATE
The linear input to the ORTEC 426 is on the front panel
BNC connector and is directly compatible with the output
of all linear amplifiers, biased amplifiers, pulse stretchers,
and delay amplifiers and with all linear circuitry found in the
ORTEC 400 Series. The Linear Gate passes only positive uni
polar signals and/or the positive portion of bipolar signals.
This must be kept in mind when putting in linear signals
from other than ORTEC products. The linear input to the
426 is ac-coupled as normally supplied, but may be dc-
coupled if desired.
If the linear input to the 426 is driven from a low driving
impedance, such as the output from an ORTEC 410 Linear
Amplifier, the 426 linear input should be terminated in the
characteristic impedance of the connecting coaxial cable.
3.3. LOGIC INPUT TO THE ENABLE INPUT
The input pulses to the Enable input may come from any
source of logic pulses. The input impedance of the Enable
input is 100012, dc-coupled, and some care must be given to
ensure that reflections do not occur in the driving trans
mission cable. This probably can best be avoided by termi
nating the driving cable at the Enable input with the
characteristic impedance of the driving cable. The amplitude
and width of the Enable input signal are specified in
Section 2.
The maximum width of the Enable input is not specified in
Section 2 and indeed may be any width since the Enable