EG&G ORTEC 459 Manuel d'utilisation et d'entretien - Page 5
Parcourez en ligne ou téléchargez le pdf Manuel d'utilisation et d'entretien pour {nom_de_la_catégorie} EG&G ORTEC 459. EG&G ORTEC 459 10 pages. 5 kv detector bias supply
Imprimer la pageORTEC 459 5KV DETECTOR BIAS SUPPLY
1. DESCRIPTION
The ORTEC 459 0—5 kV Detector Bias Supply provides a
bias voltage of either polarity for a semiconductor detector
or for a very low current voltage divider in a photo-
multiplier tube and scintillation detector assembly. Two
outputs are provided simultaneously: one for a range of 0
to 5 kV for high voltage requirements and one for a range
of 0 to 500 V for lower voltage detectors. Both output
voltages are adjusted by a 5-turn direct-reading control for a
potentiometer located on the front panel.
Either polarity is available through both outputs. The
polarity is selected by the orientation of a plug-in printed
circuit that can be attached to the main board in either of
two positions. The selected polarity is indicated by a light,
Neg or Pos, on the front panel. A front panel meter also
indicates the selected polarity and the approximate voltage
available through the 5-kV output; the 500-V output
automatically provides 10% of the level through the 5-kV
output.
The Detector Bias Supply receives its required operating
power from an ORTEC 401A/402A Bin and Power Supply
in which it is installed for operation. All of the input power
is supplied through the rear panel module connector.
2. SPECIFICATIONS
2.1. PERFORMANCE
Bias Voltage Outputs Two output circuits, ranges 0 to 5
kV and 0 to 500 V.
Bias
Control 5-turn
direct-reading
precision
potenti
ometer.
Bias Polarity Either positive or negative for both outputs
(both outputs same polarity), selected by internal switch
and indicated on front panel.
Noise and Ripple <10 mV peak to peak from 2 Hz to 50
MHz.
Temperature Instability <±0.08%/°0 through 10 to
50° 0 operating range.
Voltage Instability <±0.1%/h variation in output voltage
with constant input voltages from bin supply, constant
temperature, and constant load.
Output Current 0 to 100 /LiA.
Output Linearity Within ±3% of dial setting from 10% to
full range.
2.2.
CONTROLS
Output Voltage 5-turn direct-reading potentiometer
with 500 dial divisions adjusts the output levels for both
the 5-kV and 500-V outputs simultaneously.
Higti Voltage On/Off Toggle switch and indicator lamp
show when the instrument circuits are turned on to pro
vide an output. The lamp turns off when the remote shut
down circuit isgrounded and high voltage is notavailable.
Polarity +/- Internal plug board selects either polarity
for both outputs, and front panel indicators show which
has been selected.
2.3.
INPUTS
Power All input power is furnished through the rear
panel module connector.
Remote Shutdown (ORTEC) Rear panel BNC con
nector. Shorting the center contact to ground reduces
the output voltage to zero. Input source must be capable
of driving —2.5 mA. Under normal HV operation, center
pin voltage is —24 V.
Remote Shutdown (.Other) Rear panel BNC connector.
Shorting the center contact to ground reduces the output
voltage to zero. Input source must be capable of sinking
—800 /uA. Under normal HV operation, center pin voltage
is -+12 V.
2.4.
OUTPUTS
0-5KV (Zo = 2 MQ) Rear panel SHV connector furnishes
the adjusted output voltage in theO- to 5-kV range through
an output impedance of —2 MO.
0-500V (Zo = 700 kO) Rear panel SHV connector fur
nishes the adjusted output voltage in the 0-to 500-V range
through an output impedance of —700 kO.