Operating Manual – Performing a Measurement
The displayed dose per pulse result is a value
averaged over all pulses of the series. A change
of the dose rate during the measurement, without
a minimum pause of the measuring delay time,
will cause erroneous readouts.
If a pulse count error occurs due to a signal that is
too small (see section 2.8.3) DIADOS E will display
“LO” instead of the value.
Dose rate measurement:
During dose rate measurements, the dose rate is
displayed at intervals of 0.5 s. If the timer is active,
the measuring time will blink for a period of time
equivalent to the timer setting plus 6 s. Afterwards,
the measuring time will stop blinking.
Digital resolution:
If the resolution is insufficient, one or two asterisks
(* or **) are displayed to the left of the measured
value.
If the digital resolution is below 1 %, two asterisks **
are displayed. For resolutions between 0.5 % and
1 %, one asterisk * is displayed. When no asterisks
are displayed, the digital resolution is better than
0.5 %.
4.2.5 Ending the Measurement
A measurement initiated with Autostart ends auto-
matically when no measuring signal is detected for
more than the measuring delay time. It is not possi-
ble to stop the measurement manually. RESET
aborts a measurement and resets the measured
values to zero. With START/STOP you abort an
Autostart measurement and initiate a manual
measurement.
A manually initiated measurement is stopped with
START/STOP.
4.2.6 Display at End of Measurement
When the measurement is over, the following pa-
rameters are displayed: dose and time or dose per
pulse and number of pulses.
The dose rate indication depends on the measure-
ment type: with or without timer.
Without timer:
The displayed dose rate is zero.
With timer:
After the measurement, the average dose rate and
the timer interval (2 s/20 s) will be displayed. The
mean dose rate is the average calculated over the
last 2 s or 20 s of fluoroscopy; the last 3 s before
the radiation switches off are ignored.
If the selected fluoroscopy time is too short and
the timer function is enabled, the following
readouts may be displayed after the measure-
ment:
both dose rate and measuring time are zero
dose rate and measuring time, the measuring
time is shorter than the timer interval. The
displayed measuring values blink (see sec-
tion 1.5.10).
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