LB 134
6. Software Functions
58
Measuring time [s]
Enter the measuring time in seconds. It should be at least 60
seconds to obtain accurate measurement results. Note that the
preset measuring time limits the background measurement, no
matter what accuracy is reached!
The actual measuring time can be viewed by pressing the
Info
button. It is stored internally and is taken into account in further
calculations.
The background should be measured daily or occasionally
or it should be measured new and stored whenever chang-
ing the environment to avoid false values in the net result!
The stored background is displayed in the Background
menu. This value is subtracted from each subsequent
sample measurement.
Autostart
Here the autostart function can be enabled (
X
) or disabled (
).
When the autostart function is enabled, a background meas-
urement is carried out automatically using the preset parame-
ters whenever the device is turned on. Upon completion of the
background measurement (by manual stop or expiration of the
measuring time), store the measured background by pressing
the
Save
softkey. Only then you can start regular measure-
ments (contamination, activity, dose rate) by exiting the Back-
ground menu and the System menu.
Please note:
If the autostart function is active, a measurement
should be started only after saving and accepting the result of
the current background measurement.
BG
/ BG β
The currently stored background is displayed. It can come from
a background measurement (see above) or it can be entered
manually. For other contamination probes you see here only
BG [cps]
.
Manual change:
After selecting this option, press the
Enter
key.
Move the cursor with the
button to the desired position
and set the desired number by repeatedly pressing the
↓↑-
key.
If this is a multi-digit number, press the
button to go to
the next digit and set this digit as described above.
Once the desired value has been entered, press the
Enter
key. Thus, the entered digit is stored as a new background.
BG measuring time
At the end of a background measurement, the measuring time
is displayed in seconds. If you want to enter the backgrounds
as values, you have to enter the associated measuring time
here; otherwise the statistical error of the subsequent meas-
urement results is calculated incorrectly.
Summary of Contents for LB 134
Page 2: ......
Page 6: ...LB 134 Content IV...
Page 8: ...LB 134 Working with the User s Manual VI...
Page 10: ...LB 134 Safety Instructions VIII...
Page 34: ...LB 134 2 System Description 24 Figure 2 9 LB 134 with wall bracket...
