3 troubleshooting – Fluke Biomedical 6000-528 User Manual
Page 16
Victoreen 6000-528
Operators Manual
4-4
WARNING
CAUTION
NOTE
The ZERO adjust is a fine adjustment and requires
multiple turns on the potentiometer to change the
least
significant digit.
7.
Zero the preamplifier, with nothing connected to the input, by adjusting the pot labeled ZERO.
8.
Connect the calibration fixture to the input of the preamplifier.
Obtain the value of chamber sensitivity in dimensions of exposure per unit charge. Also, obtain the
charge calibration factor for the host instrument in dimensions of charge per displayed exposure
unit. Multiply these factors together to obtain a unitless correction factor as follows:
C
1
(Rm/nC) x C
2
(nC/R
d
) = F (R
m
/R
d
)
Where C
1
and C
2
are the calibration factors for the chamber and the host instrument, respectively. F
is the combined correction factor. The subscripts; m and d, attached to the Roentgen designation,
indicate measured and displayed values. Therefore, the final unitless correction factor, multiplied by
a displayed value yields the actual measured value.
9.
Select the 30 cm
3
position chamber volume, using the rotary switch.
10.
Adjust the 30 cm
3
, gain potentiometer on the preamplifier until the value of F, calculated previously,
appears on the display. The preamplifier is now calibrated for the specific chamber.
4.3 Troubleshooting
Extreme care must be used when troubleshooting a
system that has power applied. All standard
troubleshooting precautions apply.
Once a problem has been located, remove all
power before continuing with the repair.
Personnel performing the troubleshooting must be
familiar with the operation of the system and the
location of each piece of equipment used.
Troubleshooting consists of checking the wiring and verifying inputs/outputs are present on all
connectors, if a problem develops with the Ion Chamber, return the chamber to Fluke Biomedical.
If a problem cannot be resolved by applying the
troubleshooting procedures described above,
contact Fluke Biomedical at 440.248.9300 for
assistance.