RadComm Syclone Portable User Manual page 41

Syclone Portable Gamma-Ray Spectrometer, Revision 10
second selection is advisable if the unit is being used in a continuous search mode and
numeric data is required.
Note: The Audio response is NOT affected by this time selection as it is updated at a
fixed 5 times/second rate.
c) GRAPH SCALE
This sets the maximum vertical chart scale in counts for the "chart recorder" display.
Selections are 64cps, 128, 256, 512, 1K, 2K, 4K, 8K, 16K, 32K, 64K, 128K, 256K,
512K, 1M, 2M, 4M, 8M, 16M, 32M, 64M, 128M, 256M, 512M, 1G, 2G, 4Gcps and
AUTO
.
Some users prefer to have a fixed display so they can judge relative changes in the data
while "chart recording". They can select the desired range from the above selections.
Note: If a fixed full scale value is set and exceeded the display will saturate at the top.
Thus if you set 1K (1000cps) then the chart display will have 0 at the bottom and
1000cps at the top. As long as the radiation field stays BELOW 1000cps then the
display is normal.
If the radiation field goes above 1000cps then it will reach the upper limit and stay there
until the radiation comes below 1000cps. The numeric data on the display are unaffected
by these limits.
The AUTO mode automatically changes the vertical scaling to optimize the "chart
recorder" screen display. For example, if the current chart scale is 500 counts and the
radiation level is exceeded, the vertical scale changes to the next highest value (in this
case to 1K or 1000 counts). If the number of counts exceeds 4G cps, the chart record
scale will remain at 4G.
If the radiation level decreases, the vertical scale will remain its current level (say 2K) until
the "peak" that caused the scale change disappears from the "chart record" (256 samples
of data are displayed at one time).
The vertical scale changes back according to the 50% rule - that is, the scale decreases
such that the highest value appearing in the chart record is 50% of the maximum vertical
scale. In the above example, the radiation level may drop to 900 counts, at which time the
vertical scale returns to 1K.
d) AUDIO SCALER - determines the mode of operation of the Audio meter system
Options are OFF,
AUTO: In this mode, the variable radiation level digital data displayed on the screen will
also give a variable tone audio that directly follows the radiation level. Thus a
sudden increase in radiation level will give a corresponding increase in audio
pitch. This is a very important feature of the SEARCH mode as it permits a very
sensitive "eyes free" search tool. The data is sampled at a 200ms rate with an
optimized filter to give a quick audio response as radiation increases.
If this mode is selected, then when the SEARCH mode is started - the first 3
samples are averaged and a 2 Standard Deviations Audio Alarm Threshold set
above this average value. This stays as the permanent Audio Threshold until the
mode is de-selected and re-started. This method is suitable for most applications
as it automatically averages Background levels to define a reasonable threshold
above background.
50..250: These selections permit a fixed count rate audio threshold to be selected rather
than the automatic selection as above. Once this threshold is exceeded then the
audio gives a variable tone following the variable radiation level.
RadComm – Proprietary
AUTO,
50, 100, 150, 200, 250cps
Page 37
5.0 MANUAL MODE
Revision Date: March 3, 2016