Automatic Overload Shutdown
One of the 3102D’s circuits monitors the output load current and automatically dis-
ables the outputs for an overload or a fault condition.
A short duration arc-over or turn-on charging transient will not cause shut down. The
front panel OVERLOAD STATUS indicator lights when the unit has been shut down.
The unit can be programmed to either automatically resume operation when the fault
is removed or to require a manual reset.
Jumper J7
With Jumper J7 in position A (factory setting), the front panel RESET button must be
pressed to resume normal operation after the fault is removed. With Jumper J7 set to
position B, the output will automatically resume when the fault condition is removed.
Setup
After setting the internal controls, install the Model 3102D in the NIM bin. Connect
the load to the appropriate rear panel SHV connector, set the HV ON/OFF switch to
OFF, and set the VOLTAGE control to zero. Set the NIM bin power to ON; the appro-
priate polarity LED should light, indicating the polarity selected.
Set the HV ON/OFF switch to ON and the VOLTAGE control to the desired setting.
The front panel digital display will indicate the HV OUTPUT voltage in kilovolts
(kV).
Divide By 10 Output
The 3102D has two rear panel output connectors: HV OUTPUT and ÷10 OUTPUT.
Canberra recommends that
only one
of these outputs be used at a time.
For detectors operating at relatively low bias voltages and requiring little current, the
÷10 output should be used. This output is provided by means of a simple voltage di -
vider network, which has an impedance of 20 M
Ω
. Therefore, loading effects have to
be taken into account if there is a significant current drain.
The advantage of the ÷10 output is that the zero offset and the control are better by a
factor of 10 over that of the HV OUTPUT. Most detectors (for example, Canberra
PIPS detectors, Si(Li) detectors, and Low Energy (LEGe) detectors), take very little
current and are thus compatible with the ÷10 output. The ÷10 output should never be
used with scintillation detectors which draw relatively large currents.
7
Setup
