EG&G ORTEC 459 Manual de funcionamiento y servicio - Página 6
Navegue en línea o descargue pdf Manual de funcionamiento y servicio para Sensores de seguridad EG&G ORTEC 459. EG&G ORTEC 459 10 páginas. 5 kv detector bias supply
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Power Required for Maximum Load
+24 V, 80 mA; +12 V, 12 mA;
-24 V, 65 mA;-12 V, 0 mA.
Dimensions Standard single-width
8.714 in.) perTID-20893.
NIM module (1.35 by
3. INSTALLATION
3.1. GENERAL
The Detector Bias Supply is normally used in conjunction
with other modular electronics and is installed in a
401A/402A Bin and Power Supply. The Bin and Power
Supply is intended for rack mounting. Therefore any other
equipment that may be installed in the same rack must be
sufficiently cooled by circulating air to prevent any
localized heating in the circuits in the 459. The temperature
of equipment operating in racks can easily exceed the
recommended maximum of 50°C (120°F) unless these
precautions are taken.
3.2. SELECTION OF OUTPUT POLARITY
The polarity of the output voltage of the 459 is determined
by the location of a rectangular plug board on the main
printed circuit. Access to the plug board is obtained by
removing the left side panel of the module (viewed from
the front). Its two alternate locations are marked on the
main printed circuit.
3.3. CONNECTION TO POWER
This instrument obtains its dc operating power from the
standard Bin and Power Supply in which it is installed.
Always turn off power for both the Bin Power Supply and
the 459 before inserting or removing the module. When the
Bin and Power Supply switch is then turned on, the
polarity selection will be indicated on the 459 before high
voltage is actually furnished from its output connectors.
The adjusted high voltage is then available through the
output connectors as soon as the 459 high-voltage switch is
turned on.
3.4. OUTPUT CONNECTIONS
The Detector Bias Supply is compatible with all ORTEC
preamplifiers that include provisions to accept the high
voltage for the detector. The output controls are located on
the front panel, and the output connectors are located on
the rear panel. The output cables wil l require a type SHV
connector at the power supply end, which is the type
furnished with each ORTEC preamplifier for this purpose.
4. OPERATION
CAUTION
Always have the high voltage turned off before
connecting the cable to or disconnecting it from the
preamplifier.
After the high voltage is turned on, allow approxi
mately 30 min for high-voltage stressing of the
capacitor to subside before attempting to take data
with high-resolution systems.
4.1. SILICON SURFACE-BARRIER DETECTORS
Operating bias voltage for a silicon surface-barrier detector
should not be applied as a large step, but should be
advanced gradually from zero up to the recommended
operating potential. With the 459, set the front-panel
control at zero before switching on the power. Then
gradually advance the setting of the 5-turn potentiometer
to the recommended level for the detector.
To remove the detector bias, reduce the setting of the
5-turn control to zero at the 459 while the output cable is
still connected to the preamplifier.
4.2. OTHER TYPES OF DETECTORS
Operating bias for germanium or scintillation detectors can
be applied as a step from zero to the full operating value.
For these applications the 5-turn potentiometer can be