GammaVision
®
v7 (A66-BW) 783620H / 1013
GammaVision provides some protection for users if the ZDT-LTC mode is inadvertently selected. In this case, GammaVision v7 ignores the ZDT spectrum and presumes you intended to use the uncorrected spectrum in a constant-counting-rate application.
To summarize:
! Use the ZDT Off mode when the counting rate is expected to be constant during the time taken to acquire the spectrum.
! Use the ZDT CORR_ERR mode when the counting rate is expected to change or might change significantly during the time required to acquire the spectrum.
! Avoid using the NORM_CORR mode because GammaVision v7 will default to analyzing the LTC spectrum and will ignore the ZDT spectrum.
More Information
Visit our website or contact your ORTEC representative for more detailed information:
! Application note AN56, “Loss Free Counting with Uncertainty Analysis Using ORTEC’s
Innovative Zero Dead Time Technique,” (
http://www.ortec-online.com/pdf/an56.pdf
)
! General gamma spectroscopy technical papers (
reprints.htm#General
)
http://www.ortec-online.com/papers/
5.2.11.5. InSight Mode
The InSight display (Fig. 88) shows the actual sampled waveform in the digital processing units on a reference graticule. The Properties dialog remains active and can be used to change settings while viewing the pulses. As none of the traditional analog signals are available in digital
MCBs, this mode is the only way to display the equivalent amplifier output pulse. Note that at the bottom of the window the marker channel is displayed in units of time.
To exit the InSight mode and return to the PHA display, press <Esc> or go to the Insight section on the Amplifier 2 tab and click on Stop. The PHA mode is set to STOP when in the InSight mode.
InSight Mode Controls
The Status Sidebar changes from the PHA mode controls to the InSight controls for adjusting the peak display (Fig. 88) On the left is a vertical scrollbar for adjusting the vertical offset of the waveform. The value of the offset is shown on the display. Double-clicking the mouse in the
98
783620H / 1013 5. MENU COMMANDS
Fig. 88. The InSight Mode Display.
scrollbar will set the vertical offset to the vertical value of the channel at the marker position.
This is to conveniently zoom in on a particular part of the waveform (such as the tail for polezeroing).
In the Auto trigger mode, the display is updated every time a new pulse exceeds the trigger level. To keep a single pulse displayed, select Single. Click on Reset to refresh the display to see the next pulse. There will usually be one or two pulses in the “pipeline” that will be displayed before any change entered will be seen. If the trigger is turned off, the display will be redrawn periodically, even if no pulse is there.
The Delay setting is the time delay between the pulse shown on the display and the trigger level crossing. The value of the time delay is shown on the display.
99
