DSPEC 50
®
and DSPEC 502
®
Digital Gamma-Ray Spectrometer User’s Manual 932502G / 0618
1.6.4.1. The NORM_CORR Diagnostic Mode
Why is there a NORM_CORR mode, and why should you avoid using it? This mode simul-
taneously collects the ZDT spectrum and the conventional uncorrected spectrum. It is useful for
demonstrating that the counts in the uncorrected spectrum divided by the live time is the same
counting rate as the counts in the ZDT spectrum divided by the real time, in the special case of
constant counting rate. Because the error spectrum is not collected in NORM_CORR mode, the
standard deviation in the ZDT counts cannot be calculated if the counting rate is varying. Gam-
maVision and ISOTOPIC provide some protection for users if the ZDT-LTC mode is inadver-
tently selected. In this case, ISOTOPIC ignores the ZDT spectrum and presumes you intended to
use the uncorrected spectrum in a constant-counting-rate application.
1.6.4.2. 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 ISOTOPIC v4 will default to analyzing
the LTC spectrum and will ignore the ZDT spectrum.
More Information
For more detailed information, contact your ORTEC representative or go to our website at
www.ortec-online.com.
! Application note AN56, “Loss Free Counting with Uncertainty Analysis Using ORTEC’s
Innovative Zero Dead Time Technique.”
! General gamma spectroscopy technical papers in our online publication Library.
1.7. Host Computer and Software Requirements
The DSPEC 50 operates on any computer running under Microsoft
®
Windows
®
10, 8, 7, or XP
Professional SP3 when used with CONNECTIONS v9 or higher, and an ORTEC spectroscopy
application such as MAESTRO or GammaVision. The DSPEC 50A or 502A may also be
controlled through the Web interface, which is not Windows as described in Section 5.
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