Models 556-P and 556H-P
High Voltage Power Supply |
|
- HV supply for use with photomultiplier tubes, microchannel
plates, proportional counters, and Geiger-Mueller tubes
- 0 to ±3 kV
- 0 to 10 mA
- Digital meter reads output voltage or current
- Overload and short-circuited protected
- External control of output voltage
- 115 or 230 V AC, 47 to 63 Hz input power
General
The Models 556-P
and 556H-P High-Voltage Power Supply provide the noise-free,
well-regulated, very stable high voltage necessary for proper
operation of photomultipliers, ionization chambers, semiconductor
detectors, electron multipliers, and many other devices. The Model
556-P is housed in a double-width NIM module (per DOE/ER-0457T),
while the Model 556H-P is a stand-alone unit designed for bench-top
operation. The low-noise output is continuously adjustable from ±10
to ±3000 V DC with 0 to 10 mA load current. Noise on
the output is <10 mV peak-to-peak, thereby ensuring the
highest performance in high-resolution, semiconductor or
scintillation spectroscopy systems.
The front-panel digital meter allows visual monitoring of either
the output voltage or the output current.
|
|
The output voltage can be controlled from ±10 to ±3000 V by
application of an external input voltage of 0 to ±6.9 V DC.
This feature is desirable for control applications and is standard on all
units.
The input power for Models 556 and 556H is taken directly from the ac
line, either 115 or 230 V AC, 47 to 63 Hz.
Overload and short-circuit protection networks permit operation into
short circuits without damage to the instrument.
| Output |
|
|
|
Connector |
|
Two
SHV front-panel connectors wired in parrallel |
|
Polarity |
|
Positive
or negative, selected by switch on rear panel |
|
Voltage
Range |
|
50
to 3000 V; minimum usable voltage 10 V |
|
Current
Capacity |
|
0
to 10 mA |
|
Regulation |
|
<0.0025%
variation in output voltage for combined line and load variations
within operating range at constant ambient temperature |
|
Temperature
Stability |
|
<±50
ppm/°C after 30-minute warm-up; operating range 0 to 50°C. |
|
Long
Term Drift |
|
<0.01%/hour
and <0.03%/24-hour variation in output voltage at constant input
line voltage, load, and ambient temperature after 30-minute warm-up. |
|
Ripple |
|
<10 mV
peak-to-peak, 20 Hz to 20 MHz |
|
Protection |
|
Internal
circuitry protects against overloads including short circuits. |
|
Resettability |
|
Output
voltage can be reset to within 0.1% |
| Controls
& Indicators |
|
|
|
Power |
|
Front-panel
toggle switch energizes unit when power cord is connected to
appropriate source, and an adjacent red LED lamp indicates when
power is applied |
|
Output
Voltage |
|
One
6-position switch, one 5-position switch, and one 10-turn precision
potentiometer; output voltage is the sum of the 3 settings |
|
Meter |
|
Front-panel
toggle switch selects display of output voltage in V or load current
in mA. |
|
Polarity |
|
Rear-panel
switch selects either positive or negative output polarity |
|
Control |
|
Rear-panel
locking toggle switch selects the reference source for the output
voltage:
INT Selects the internal reference source; the front-panel controls
select the output voltage.
EXT Selects the external reference source; output voltage is
proportional to magnitude of reference input. |
|
AC
Voltage |
|
Rear-panel
slide switch selects either 115 V or 230 V AC input
voltage |
|
LCD
Meter |
|
Front-panel
LCD display indicates output voltage in kV ±10 V or load
current in mA ±10 µA. Load current is sum of external load
current and internal load current. Internal load resistance is ~5 MW. |
| Line
Input |
|
103–129
V or 206–258 V, 47–63 Hz, 70 W nominal at full output
power; supplied through international standard IEC power connector
on rear panel. Fuse rating: 1.5 A, 250 V fuse for
115 V AC operation or 0.75 A, 250 V fuse for
230 V AC operation. |
| Control
Voltage Input |
|
Full
range of output voltage can be based on an external DC reference
level applied to a rear-panel BNC connector; control voltage
range is 0 through ±6.9 V DC; control voltage polarity
must be the same polarity as that selected by the rear-panel
Polarity switch; this input protected against over-voltages >±7
V. Input impedance >45 kW. |
| Dimensions |
|
|
|
Model
556 |
|
Standard
double-width NIM module, 69 mm x 221 mm (2.7" x
8.714") |
|
Model
556H |
|
114.3 mm
high x 224 mm wide x 292 mm deep (4.5" high x 8.8"
wide x 11.5" deep) |
| Weight |
Model
556 |
|
Net:
3.6 kg (8.0 lb); Shipping: 4.5 kg (10.0 lb) |
|
Model
556H |
|
Net:
5.7 kg (12.6 lb; Shipping: 6.6 kg (14.6 lb) |
is
a trademark of AMETEK, Inc.