Service manual

6
Attenuator. Maximum dc voltage ±35 V. Input
impedance 100
(to match preamplifiers); 50
optional.
CLIP Two front panel BNC connectors to provide
delay line clipping of the input pulse. Cable
impedance must be 50
. Delay line clip is 2X the
cable propagation delay. Gain is reduced by factor
of 2 when using cable clip.
2.4. OUTPUTS
OUTPUT Front panel BNC connector furnishes
the amplified and shaped signal through Z
out
, <l .
Amplitude 0 to ±5V into 50
; risetime and decay
time constants controlled by the integrate and
differentiate filter settings.
BUSY Rear panel BNC furnishes NIM-standard
positive logic signal during the BLR busy time.
PREAMP POWER Rear panel standard ORTEC
power connector, Amphenol 17-80090-15.
2.5. ELECTRICAL AND MECHANICAL
POWER REQUIRED +24V, 80 mA; -24V, 80mA;
+12V, 160 mA; -12 V, 140 mA. NIM-standard
single-width module.
WEIGHT
Net 1.5 kg (3.3 lb).
Shipping 3.0 kg (7.0 lb).
DIMENSIONS Standard single-width NIM module
(1.35 X 8.714 in.) per TID-20893 (Rev).
3. INSTALLATION
3.1. GENERAL
The ORTEC Model 579 operates on ±12 V and
±24V power that must be furnished from a nuclear-
standard bin and power supply such as the ORTEC
4001C/4002Series. The bin and power supply is
designed for relay rack mounting. If the equipment
is to be rack mounted, be sure that there is
adequate ventilation to prevent any localized
heating of the components that are used in the 579.
The temperature of the equipment mounted in
racks can easily exceed the maximum limit of 50°C
(323 K) unless precautions are taken.
3.2. CONNECTION TO POWER
The 579 contains no internal power supply and
must obtain the necessary dc operating power from
the bin and power supply in which it is installed for
operation. Always turn off power for the power
supply before inserting or removing any modules.
ORTEC modules are designed so that a full
complement of modules installed in the bin will not
overload the NIM-standard power supply. Since,
however, this may not be true when the bin contains
modules other than those of ORTEC design, the dc
power levels should be checked after all of the
modules have been installed. The ORTEC bins and
power supplies have convenient test points on the
power supply control panel to permit monitoring
these dc levels.
3.3. INPUT/OUTPUT CONNECTIONS
The input impedance of the 579 is 100
and
provides a suitable termination for cable with a
characteristic impedance of 93
. If the cable that
is used for the input signals has a characteristic
impedance of 50
, use a BNC Tee at the 579 Input
to accommodate the cable and a 100
terminator;
the terminator and the input impedance, which are
in parallel, will then match the 50
cable
impedance.
The low output impedance of the 579 requires that
the output cable be terminated by the characteristic
impedance of the cable at its remote end. This can
be accomplished at the input of a high-input
impedance instrument or by using an instrument
with an input impedance equal to the impedance of
the cable.