ORTEC
®
Detective-EX/DX
®
-100T Portable HPGe Spectrometer — User’s Manual
931040P / 1014
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Figure 31. “Strip Chart”
Emulation With Autoscaled Y-
Axes.
!
Zoom In <> — The <> button expands the display by halving the number of channels, so
the peaks appear wider. The center channel of the new display will be the marker
position.
!
Zoom Out >< — The > < button contracts the display by doubling the number of chan-
nels, so the peaks appear narrower. The center channel of the new display will be the
marker position or channel 0 is the leftmost corner of the display or channel 8192 is the
rightmost corner of the display.
!
Lin/Log — The Lin button changes the vertical display to linear mode and automatic
vertical limits. The Lin button changes to Log in the linear mode. Tap Log to change the
vertical scale to log mode.
!
Pause/Continue — If the Detective-EX is acquiring data, you can pause the data
collection and resume it later. Tap Pause to stop collection. The button will change to
Continue in the pause mode. Tap Continue to resume the data collection.
3.3. Search Mode
The Search Mode screen is a “strip-chart” emulation
that displays total count rate (gamma and neutron) vs
time (see Fig. 31). The gamma-ray data are presented
in blue and the neutron data are shown in red.
Because the spectrum display area is limited, a modified
version of scientific notation is used when labeling the
Y axes for numbers greater than or equal to 10,000: The
number of trailing zeros in the number is replaced by
“E” followed by the number of zeros. Some examples:
10,000 becomes 1E4; 12,000 becomes 12E3.0 cps and
the neutron data are scaled from 0 to 500 cps.
The Y-axes can be autoscaled (Scaled Y) so the current
maximum Y value for both counts is near the top of the
graph, as shown in Fig. 31; or fixed (Fixed Y) such that
the gamma-ray data are scaled from 0 to 1000.
!
To start a search session, tap Search in the Survey Mode or any other dialog with the
Search button. If you wish to save the spectral data from the preceding identification or
search session, you must do so before starting the new search (tap Display, then Save).
Summary of Contents for Detective-DX-100T
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