N471G 2 Channel HV Power Supplies for Germanium Detectors
The Mod. N471G is a special version designed to be used with Germanium Detectors. It houses 2
independent High Voltage channels. The output voltage ranges (automatic selection) is ±8 kV / 8 µA with 1
nA resolution.
The output polarity is independently selectable for each channel. The unit has slow HV ramps, in order to be
used with Germanium Detectors, coupled with the Mod. A483 External 8 kV HV filter; using such filter output
voltage ripple is kept under 5 mV (28 µs period ripple < 2 mV).
Two 10-turn potentiometers (one per channel) located on the front panel allow the HV setting, while 4
trimmers (2 per channel) allow the current and the max. voltage limit settings. The channel polarity, the
overcurrent and overvoltage status are displayed by front panel LEDs. One front panel connector per
channel allows the current monitoring. The channel inhibit can be done either individually for each channel
via a front panel switch, or in common to all channels, both locally via front panel switch and remotely via an
external signal. A common four digit display indicates the value of the parameter under control. The selection
of the channel, the parameters and the set/monitor mode is performed via front panel switches. The module
is intrinsically safe: the High Voltage is present only on the SHV output connectors.
N471G - Technical Specifications
Number of channels
2
HV range
±50 V to ±8 kV
Maximum output current
8 µA
Polarity
positive or negative selectable by the User
HV Set Resolution
±1 V
HV Mon resolution
±1 V
I Set resolution
±1 nA
I Monitor resolution
±1 nA
Vmon accuracy
0.5% ±8 V
Imon accuracy
2% ±10 nA
Vmax accuracy
1% ±8 V (Vmax > 1000 V)
Ripple
5 mVpp (with A483 filter); 50 mVpp (no filter)
28µs-period ripple: 2mVpp (with A483); 40 mVpp (no
filter)
A483 input impedance
200 KOhm
RAMP-UP
Fixed (1 V/s)
RAMP-DOWN
Fixed (1 V/s)
Humidity range
10% to 80%
Operating temperature
0 to 45 °C
HV Out ttemp. Coeff.
max 0.005% / °C
HV Long term stability
±2 V
