sitivity of the 9660 input to ground loop induced noise. Best performance is
obtained with the LB1500 installed at the energy or output BNC on the
preamp.
3.
Connect the Detector/Preamp High Voltage Input to a suitable High voltage
Power supply such as a Model 9645 ICB Programmable HV Power Supply.
The High Voltage Power Supply should be installed in the same NIM Bin as
the 9660 to reduce the possibility of ground loops and noise pickup. Please
refer to the Operating Manuals of the Detector, High Voltage Power and any
other accessories for specific hook up and operating instructions.
4.
Turn the NIM Bin power on. At power up, the Model 9660 will go through
an initialization and self-diagnostic process as described in “Initialization and
Self-Diagnostics” on page 34.
5.
Turn on the High Voltage Bias Supply and adjust as required by the Detector
manufacture’s specifications. Allow the 9660 and Detector system to warm
up and stabilize.
6.
The setup instructions that follow will allow you to get the 9660 set up and
running with a typical detector and to become acquainted with its operation.
For the following setup, a detector with preamp gain of 500 mV/MeV and a
60
Co radioactive source will produce a 6.5 to 7 volt trapezoid signal at the
Monitor Output. The 1332 keV
60
Co peak should collect in channel 6500 to
7200 on the MCA when setup for a 8192 memory or spectrum size.
The various parameters are grouped into three device types: Stabilizer, Filter
and Gain
For this quick setup and check of the 9660, many of the parameters may not
require adjustment; leave them set to the default values. Parameters using
default values are marked with an asterisk (*).
7.
MID Editor Settings. Please verify or set the following setup parameters in
your Genie Spectroscopy System’s MCA Input Definition (MID) Editor. For
complete information on editing MID files, refer to the MID Editor chapter
in your Genie manual set.
7a. DSP Filter Parameters
*Preamp Type:
RC
Inp Polarity:
Set Positive or Negative to match the preamp
signal polarity of the intended detector.
Inh Polarity:
If the detector has an RC type preamp, this
function is not applicable and it is not necessary
Chapter 6 - Setup and Operation
36
Model 9660-9660A ICB Digital Signal Processor
