Measuring range
The PDC can measure Dose, Dose Rate, DAP and DAP Rate. The DAP and DAP Rate
have either low or high dose rate range.
When in the dose area product display mode the PDC has two ranges “low rate” and “high
rate”. The selected rate is indicated by the corresponding LED. The rated range of use for
each is given on page 15 of the Technical specifications.
Note The system automatically defaults to the “Low Rate” mode and when the rate
is to high, an error message “OVERRATE” will be displayed. The mode should then
be changed to “High Rate”.
To change the measuring range press the range button and confirm the function has been
completed by inspection of the indicator LED’s.
Note.
The measured values are displayed as floating point numbers.
Low battery indicator
The LED “low battery” is turned on when the state of charge of the internal lithium ion
battery is less then 20%. In this condition the device will be operable for at least one hour.
When the battery is completely exhausted the device switches off automatically.
Switching off the device
By pressing the on/off button for minimum two seconds, the device is switched off.
Note
. The PDC incorporates an auto power off feature. The system is switched off
automatically after 15 minutes of inactivity (default time, the time can be changed via the
PC software).
Dose and dose rate measurements
Depress the ‘Mode’ button until the ‘mGy’ indicator is illuminated. Make sure that the x-ray
field size is larger than the red 10 cm diameter circle area indication on the PDC cover.
Set the exposure to be greater than 1 second. Ensure that the display reads zero. Press
the ‘Reset’ button to clear any erroneous readings caused by movement. The dose rate
will be immediately displayed during the exposure and the dose is displayed following the
exposure. The software can be used to capture the exposure dose rate. Note that the
high and low range mode does not affect the dose and dose rate functions. The PDC
readings will self-clear in 22 seconds or can be manually cleared by pressing the ‘Reset’
button.
DAP and DAP Rate measurements
Depress the ‘Mode’ button until the ‘uGy*m
2
‘ indicator is illuminated. Make sure that the
x-ray field within the 30x30 cm area indication on the PDC cover. The field can be any
shape as long as it is within the 30x30 cm area indication. Select ‘low rate’ for expected
exposures from 1 uGy*m
2
/min to 10 mGy*m
2
/min. Select ‘High range’ for exposures
exceeding 2 mGy*m
2
/min. Set the exposure to be greater than 1 second. Ensure that
the display reads zero. Press the ‘Reset’ button to clear any erroneous readings caused
by movement. The DAP dose rate will be displayed immediately during the exposure and
the DAP is displayed following the exposure. The software can be used to capture the
exposure DAP rate. The PDC readings will self-clear in 22 seconds or can be manually
cleared by pressing the ‘Reset’ button.
13
Summary of Contents for PDC
Page 1: ...Model PDC Patient Dose Calibrator Instruction Manual...
Page 2: ......
