Indication of Dose Rate Mean Value
The dose rate mean value is displayed digitally with four digits:
The digits will flash as long as the statistical error (one relative standard deviation) is greater than 5%.
The flashing will stop as soon as the 5% limit is achieved. The smaller the dose rate, the longer this will
take. For a detailed discussion of the mean value and the standard deviation see section 4.4.
Connecting or disconnecting a probe clears the current mean value and starts its calculation again.
The digits will then start flashing again. Switching the instrument on also starts calculation of the
mean value again. The 6150AD3/4/5/6 additionally allows to restart calculation of the mean value by
pressing the on/off key twice within three seconds.
With the 6150AD1/2/3/4, the signal key does not have any function now. With the 6150AD5/6, the
signal key alternately switches between indication of mean value and its relative standard deviation.
Also when indicating standard deviation, pressing the on/off key twice will restart mean value
calculation. Indication of relative standard deviation looks as follows:
With an external probe you will see the same image just with the probe type »ext xy« added.
Indication of relative standard deviation may range from 0.1% to 99%. If the standard deviation is
greater than 99%, or if no pulses were counted so far, the instrument will display »99%« flashing. If
standard deviation is lower than 0.1%, »0.1% max« will be displayed.
Indication and Selection of Dose Rate Alarm Threshold
The dose rate alarm threshold is displayed digitally with three digits:
The loudspeaker symbol in the upper right corner shows that this indication concerns a threshold, not a
measured value. With the 6150AD1/2 the range starts at 0 µSv/h, with the 6150AD3/4/5/6 at 0.0 µSv/h.
The range of the 6150AD3/4/5/6 is extended by one place after the decimal point, so that »odd« values
like 7.5 µSv/h may be represented.
If no dose rate alarm threshold is selected (dose rate warning disabled), the digital display of the
6150AD1/2 will be blank, whereas the 6150AD3/4/5/6 will display »OFF«.
The signal key allows to select a threshold from a set of fixed values, which in case of the
6150AD3/4/5/6 additionally includes the user programmable threshold.
external probe, e.g. 6150AD-17:
external probe, e.g. 6150AD-17:
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