DSPEC 50
®
and DSPEC 502
®
Digital Gamma-Ray Spectrometer User’s Manual 932502G / 0618
Figure 41. DSPEC 50 High Voltage Tab.
wide as the peak. Now click the appropriate Enabled checkbox to turn the stabilizer on. Until
changed in this dialog, the stabilizer will stay enabled even if the power is turned off. When the
stabilizer is enabled, the Center Channel and Width cannot be changed. For more detailed
information on gain and zero stabilization, see Section D.2.
4.6. High Voltage
Figure 41 shows the High Voltage
tab, which allows you to turn the
HV on or off; set and monitor the
voltage; select the HV Source and
Shutdown mode; and indicate the
detector type; and Polarity. Note
that if the detector is attached via
the rear-panel DIM connector, some
of these options may be disabled or
auto-selected. For example, the
detector polarity is determined by
the SMART-1 or DIM module.
The Source is Internal for con-
ventional, non-DIM detectors;
DIM-296 for the Model 296, and
DIM/SMART for all other DIM-based detectors.
NOTE NaI detectors require the DIM-POSNAI interface and the DIM/SMART source
selection.
The shutdown types are ORTEC, TTL, and SMART. The ORTEC mode is used for all
ORTEC detectors except SMART-1 (SMART) detectors. For non-ORTEC detectors, check
with the manufacturer. The TTL mode is used for most non-ORTEC detectors.
Choose the detector Polarity (SMART-1 detectors auto-select this setting). Normally, GEM
(p-type) detectors have a positive signal and GMX (n-type) detectors have a negative signal.
To use a Sodium Iodide Detector, mark the checkbox. This changes the gain and zero
stabilizers to operate in a faster mode.
Enter the detector high voltage in the Target field, click On, and monitor the voltage in the
Actual field. Click the Off button to turn off the high voltage. The HV will not turn on if the
detector is sending a remote shutdown or overload signal. The Overload indicator means there
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